JP2013089558A - Power storage element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage element capable of preventing a collector or a power generation element from being damaged under vibration environment.SOLUTION: The power storage element includes a pair of spacer members placed, respectively, along the partition walls facing each other of a case which houses a power generation element where a positive electrode plate and a negative electrode plate are laminated alternately with a separator interposed therebetween while being displaced in one direction, and a pair of collectors connected electrically with the positive electrode plate and the negative electrode plate located at both ends of the power generation element in the one direction. Each spacer member includes a pair of spacer bodies placed to face both sides at the end of the power generation element in the one direction, and a coupling part which couples the pair of spacer bodies each other. Each spacer body is formed so that a support part is formed along a ramp which is formed on the outer surface of the power generation element as the positive electrode plates or the negative electrode plates are gathered, and the support part is formed to come into tight contact even with the partition wall of the case in a state where the support part is in tight contact with the ramp.

Description

  In the present invention, a power generation element and a current collector electrically connected to the power generation element are accommodated in a case, and the current collector is electrically connected to an output terminal disposed outside the case. It relates to a power storage element having a structure fixed to the case.

  In recent years, chargeable / dischargeable storage elements have been adopted as power sources for various devices. In the present specification, the “storage element” is a concept including both a battery (such as a lithium ion battery and a nickel metal hydride battery) and a capacitor (such as an electric double layer capacitor).

  As shown in FIG. 7, the power storage element includes a power generation element 2, a pair of current collectors 3a and 3b electrically connected to the power generation element 2, and a power generation element 2 and a pair of current collectors 3a and 3b. The housing 4 is provided with a pair of output terminals 5a and 5b arranged outside the case 4.

  The power generation element 2 includes a positive electrode plate 20a, a negative electrode plate 20b, and a separator 20c. That is, the power generation element 2 includes a very thin positive electrode plate 20a having a positive electrode active material layer formed on a metal foil, a very thin negative electrode plate 20b having a negative electrode active material layer formed on a metal foil, And an insulating separator 20c. As shown in FIG. 8, the positive electrode plate 20a and the negative electrode plate 20b are overlapped with each other in a state of being relatively displaced in the first direction with the separator 20c interposed therebetween. The current collectors 3a and 3b are connected to the positive electrode plate 20a and the negative electrode plate 20b at both ends of the power generation element 2 in the first direction, respectively. Each of the positive electrode plate 20a and the negative electrode plate 20b at both ends of the power generation element 2 in the first direction is concentrated on the center side in the second direction orthogonal to the first direction when connected to the current collectors 3a and 3b. The

  As shown in FIG. 7, each of the pair of current collectors 3 a and 3 b includes power generation element connection portions 30 a and 30 b disposed along a third direction orthogonal to the first direction and the second direction, and the power generation element connection. And fixing pieces 31a and 31b extending from the portions 30a and 30b.

  The power generation element connecting portion 30a of one current collector 3a is mechanically and electrically connected to the positive electrode plate 20a (the positive electrode plate 20a concentrated in the second direction) at one end of the power generation element 2 in the first direction. (See FIG. 8). The fixing piece 31 a of one current collector 3 a is disposed along the inner surface of the case 4. The fixing piece 31a is fixed to the case 4 by a fastening member (for example, a rivet) 6a inserted through the case 4, and is fastened to the positive output terminal 5a disposed outside the case 4. It is electrically connected via 6a.

  The power generation element connection portion 30b of the other current collector 3b is the same as the power generation element connection portion 30a of the one current collector 3a. Thereby, the electrical storage element 1 can supply the electric power from the electric power generation element 2 to a pair of output terminal 5a, 5b via a pair of electrical power collector 3a, 3b.

JP 2011-14276 A

  By the way, the electric storage element 1 may be employed as a power source for devices that generate vibrations when driven (for example, various devices such as a hybrid electric vehicle (HEV), an electric vehicle (EV), an electric motorcycle, an aircraft, and a ship). is there. However, when the said electrical storage element 1 is employ | adopted as such an apparatus, there exists a possibility that the electric power generation element 2 and collector 3a, 3b may be damaged by the vibration of an apparatus.

  Specifically, each of the positive electrode plate 20a and the negative electrode plate 20b at both ends of the power generation element 2 in the first direction is concentrated on the center side in the second direction orthogonal to the first direction as described above. Therefore, as shown in FIG. 8, inclined portions 200 a and 200 b are provided on the outer surfaces of the power generation element 2 in the first direction on the one end side and the other end side, respectively, and on the outer surfaces on both sides of the power generation element 2 in the second direction. Is formed. That is, inclined portions 200 a and 200 b are formed on the outer surfaces of the four corners of the power generation element 2.

  In connection with this, the inclination aspect (or curvature aspect) of the electrode plates 20a and 20b in the laminated state inside the inclined portions 200a and 200b is different between inside and outside in the lamination direction. Therefore, the electrode plates 20a and 20b constituting the inclined portions 200a and 200b and the electrode plates 20a and 20b inside the inclined portions 200a and 200b are in a state of being easily deformed.

  Therefore, when the vibration of the device is transmitted and the entire storage element 1 vibrates in the second direction, the electrode plates 20a and 20b constituting the inclined portions 200a and 200b in the power generation element 2 and the inner sides of the inclined portions 200a and 200b are present. The electrode plates 20a and 20b are repeatedly deformed. As a result, the electrode plates 20a and 20b constituting the inclined portions 200a and 200b and the electrode plates 20a and 20b inside the inclined portions 200a and 200b may eventually break.

  If demonstrating it concretely, the laminated | stacked electrode plates 20a and 20b are crowded in the center part of the electric power generation element 2 in a 1st direction. Therefore, when the vibration of the device (vibration in the second direction) is transmitted to the power storage element 1, the power generation element 2 tries to swing in the second direction around the central portion of the power generation element 2 in the first direction. . Then, electrode plates (electrode plates constituting the inclined portions 200a and 200b and electrode plates stacked inside the inclined portions 200a and 200b) 20a and 20b in the vicinity of the connection positions with the power generation element connection portions 30a and 30b are provided. The oscillation of the central portion of the power generation element 2 is followed. Therefore, the electrode plates 20a and 20b constituting the inclined portions 200a and 200b and the electrode plates 20a and 20b inside the inclined portions 200a and 200b are repeatedly deformed. For this reason, there is a possibility that the electrode plates 20a and 20b of the power generation element 2 are broken, and the power cannot be supplied.

  Further, when the power generation element 2 tries to swing in the second direction in the case 4 due to the vibration of the device, the current collectors 3a and 3b supporting the power generation element 2 also try to swing in the second direction. As a result, the fixing pieces 31a and 31b (portions fixed to the partition wall 41) of the current collectors 3a and 3b and the power generating element connection portions 30a and 30b and the fixing pieces 31a and 31b in the current collectors 3a and 3b Bending stress (bending action) is repeatedly generated in the vicinity of the boundary. For this reason, the current collectors 3a and 3b may be fatigued (broken).

  Then, an object of this invention is to provide the electrical storage element which can prevent that a collector and an electric power generation element are damaged in a vibration environment in view of such a situation.

The electricity storage device according to the present invention
A power generation element including a separator having electrical insulation, and a positive electrode plate and a negative electrode plate that are superimposed in a state of being relatively displaced in the first direction with the separator interposed therebetween;
A pair of current collectors each electrically connected to a corresponding polar plate of the positive electrode plate and the negative electrode plate at both ends of the power generation element in the first direction;
A case having a partition wall defining an internal space for accommodating the power generation element and the pair of current collectors;
A pair of output terminals disposed outside the case;
A spacer member disposed along at least one of the two end edges of the power generation element in the first direction,
Each of the positive electrode plate and the negative electrode plate at both ends of the power generation element in the first direction is concentrated on the center side in the second direction orthogonal to the first direction,
On the outer surfaces of the one end side and the other end side of the power generation element in the first direction, on the outer surfaces on both sides of the power generation element in the second direction, the positive plates at both ends of the power generation element and the An inclined part is formed with each concentration of the negative electrode plate,
Each of the pair of current collectors is
A power generation element connection portion disposed along a third direction orthogonal to the first direction and the second direction, the positive electrode plate and the negative electrode being concentrated at both ends of the power generation element in the first direction A power generating element connection that is electrically connected to a corresponding polarity plate of the plates;
A fixing piece extending from the power generating element connecting portion, and is electrically connected to an output terminal having a corresponding polarity of the pair of output terminals while being fixed to the partition wall of the case. A fixing piece,
The spacer member is a pair of spacer main body portions disposed on both sides in the second direction of corresponding end portions of the power generation elements in the first direction, and is in close contact with the partition wall of the case. A pair of spacer main body portions, and a connecting portion for connecting the pair of spacer main body portions to each other,
Each of the pair of spacer main body portions includes a support portion that is in close contact with the inclined portion of the power generation element.

  Here, “closely” means that there is no gap between the target portion or member, or that there is no substantial gap between the target portion or member, It is placed in close contact with the target part or member in direct contact with the target part or member, or with the insulating sheet or bag sandwiched in between. Means to be placed in.

  According to the electricity storage device having the above configuration, when subjected to vibration in the second direction, the spacer member constitutes an inclined portion formed on at least one of the one end side and the other end side of the power generation element in the first direction. The deformation of the electrode plate and the electrode plate laminated inside the inclined portion can be restricted, and the oscillation of the entire power generating element can be restricted.

  Specifically, the spacer member is disposed along at least one of the both end edges in the first direction of the power generation element, so that each of the pair of spacer body portions in the spacer member is a partition wall of the case. Are arranged on both sides of the end portion in the first direction of the power generation element in direct or indirect contact with the power generation element. That is, the pair of spacer main body portions are arranged in the case in a state where movement from the inner side to the outer side of the case is restricted.

  Thereby, each support part of the spacer main-body part by which movement was controlled is maintained in the state (close state) along the inclined part of the power generation element which counters. Therefore, the inclined portion (electrode plate) in the power generation element is restrained by the support portion, and deformation of the inclined portion with respect to the vibration in the second direction is restricted. Accordingly, deformation of the electrode plate inside the inclined portion with respect to the vibration in the second direction is also restricted. Therefore, it is possible to prevent the electrode plate constituting the inclined portion in the power generation element and the electrode plate inside the inclined portion from being freely deformed, and to prevent the electrode plate from being damaged.

  Therefore, the bending action does not repeatedly act on the power generation element and the current collector connected to the power generation element, and the power generation element and the current collector are prevented from being damaged.

  Further, in the power storage element, the spacer main body portion (support portion) is in surface contact with the inclined portion of the power generation element. Therefore, when the spacer main body restrains the power generation element, the electrode plate (positive electrode plate or negative electrode plate) does not collide with the spacer main body, and the power generation element is not damaged by providing the spacer member.

  It is preferable that a pair of the spacer members are provided, and the pair of spacer members are arranged along both end edges of the power generation element in the first direction. Such a power storage element can regulate swinging of the power generation element in the first direction and the second direction by the pair of spacer members.

  Specifically, the pair of spacer members are disposed along both end edges in the first direction of the power generation element, so that each of the pair of spacer main bodies in one spacer member is directly or indirectly on the partition wall of the case. Are arranged on both sides of one end portion of the power generation element in the first direction. Moreover, each of a pair of spacer main-body part in the other spacer member is arrange | positioned in the both sides of the other end part of the 1st direction of an electric power generation element in the state which contact | connected directly or indirectly to the partition of a case. That is, the four spacer main body portions are arranged at the four corners in the case in a state in which the movement from the inner side to the outer side of the case is restricted.

  Thereby, each support part of the spacer main-body part by which movement was controlled is maintained in the state (close state) along the inclined part of the power generation element which counters. Therefore, each of the inclined portions (electrode plates) in the power generation element is restrained by the support portion, and the deformation of the inclined portions with respect to the vibration in the first direction and the vibration in the second direction is restricted. Accordingly, deformation of the electrode plate inside the inclined portion is also restricted. Therefore, it is possible to prevent the electrode plate constituting the inclined portion in the power generation element and the electrode plate inside the inclined portion from being freely deformed, and to prevent the electrode plate from being damaged.

  Further, since the inclined portion of the power generation element is a portion extending in a direction intersecting with the combined direction of the swinging directions (first direction and second direction) of the power generation element, the support portion of the spacer body along the inclined portion is The force (the force in the first direction and the force in the second direction) acting when the power generation element is about to move can be received. As a result, the four spacer main body portions arranged at the four corners in the case constrain the entire power generating element, and the entire power generating element swings (moves) in the case with respect to the vibration in the first direction and the vibration in the second direction. Is surely prevented.

  Therefore, the bending action does not repeatedly act on the power generation element and the current collector connected to the power generation element, and the power generation element and the current collector are prevented from being damaged.

  Further, in the power storage element, the spacer main body portion (support portion) is in surface contact with the inclined portion of the power generation element. Therefore, when the spacer main body restrains the power generation element, the electrode plate (positive electrode plate or negative electrode plate) does not collide with the spacer main body, and the power generation element is not damaged by providing the spacer member.

  The power generation element connection portion has a first end connected to the fixing piece, and a second end located in the vicinity of the partition facing the partition fixed to the fixing piece, The connecting portion of the spacer member is disposed along the partition facing the partition fixed to the fixing piece, and the power generating element connection in the corresponding current collector of the pair of current collectors It is preferable that the 2nd edge part of a part is connected. In this way, the second end portion of the power generation element connection portion does not become a free end. Therefore, the swinging of the current collector (power generation element connection portion) is reliably regulated. Therefore, the power generation element and the current collector are reliably prevented from being damaged.

  Between the pair of spacer main bodies in the spacer member, the power generation element connection portion of the corresponding current collector of the pair of current collectors is interposed, and each of both ends in the second direction of the power generation element connection portion. Is preferably fitted to each of a pair of spacer bodies disposed on both sides. If it does in this way, at least both ends of the power generation element connection part in each of a pair of current collectors will be restrained by a spacer member (a pair of spacer main-body parts). Thereby, the rocking | fluctuation of the electric power generation element connection part in each of a pair of electrical power collector can be controlled more reliably, and the failure | damage of an electric power generation element and the electric power collector can be prevented more reliably.

  As described above, the electricity storage device of the present invention can have an excellent effect that the current collector and the power generation element can be prevented from being damaged under a vibration environment.

FIG. 1 is an overall perspective view of a power storage element (battery) according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of the energy storage device (battery) according to the embodiment. FIG. 3 is a partially exploded perspective view of the energy storage device (battery) according to the embodiment, and is a partially exploded perspective view of the case in which the power generation element and the current collector are taken out from the case main body. FIG. 4 is a cross-sectional view including a partially enlarged cross-sectional view of the energy storage device (battery) according to the embodiment. FIG. 5 is a partially exploded perspective view of a power storage element (battery) according to another embodiment of the present invention, and is a partially exploded perspective view showing a state where a power generation element and a current collector are taken out from a case main body of the case. FIG. 6 is a cross-sectional view including a partially enlarged cross-sectional view of a power storage element (battery) according to another embodiment of the present invention. FIG. 7 is a perspective view of a conventional power storage element. FIG. 8 is a cross-sectional view including a partially enlarged cross-sectional view of a conventional power storage element.

  Hereinafter, a power storage device according to an embodiment of the present invention will be described with reference to the accompanying drawings. In the present embodiment, a lithium ion battery (hereinafter simply referred to as a battery) will be described as an example of a power storage element.

  As shown in FIGS. 1 to 3, the battery according to this embodiment includes a power generation element 2, a pair of current collectors 3 a and 3 b electrically connected to the power generation element 2, and the power generation element 2 and a pair of current collectors. A case 4 containing the electric bodies 3a and 3b and a pair of output terminals 5a and 5b disposed outside the case 4 are provided.

  As shown in FIG. 2, the power generation element 2 has an electrical insulation property between a positive electrode plate 20 a having a positive electrode active material layer formed on a metal foil and a negative electrode plate 20 b having a negative electrode active material layer formed on a metal foil. Separator 20c. The power generating element 2 is configured by overlapping the positive electrode plate 20a and the negative electrode plate 20b with the separator 20c interposed therebetween in a state of being relatively displaced in the first direction. Therefore, a positive electrode lead portion 21a in which only the positive electrode plate 20a exists is formed at one end portion of the power generation element 2 in the first direction, and only a negative electrode plate 20b exists in the other end portion of the power generation element 2 in the first direction. A negative electrode lead portion 21b is formed.

  The positive electrode plate 20a, the negative electrode plate 20b, and the separator 20c are each formed in a strip shape. The positive electrode plate 20a, the negative electrode plate 20b, and the separator 20c are overlapped in a state in which the longitudinal directions are matched, and are wound in the longitudinal direction. More specifically, the positive electrode plate 20a and the negative electrode plate 20b are overlapped with each other while being relatively displaced in a direction orthogonal to the longitudinal direction (direction corresponding to the first direction) and wound in the longitudinal direction. Yes. Thus, a positive electrode lead portion 21a in which only the positive electrode plate 20a is laminated is formed at one end of the power generation element 2 in the winding center direction (direction corresponding to the first direction), and the power generation element 2 in the winding center direction is formed. The negative electrode lead portion 21b in which only the negative electrode plate 20b is laminated is formed at the other end of the electrode.

  In the present embodiment, the power generation element 2 is formed in a flat shape. Thus, the power generating element 2 includes a pair of straight portions 22 and 22 that extend straight on both sides of the winding center when viewed from the winding center direction (the direction corresponding to the first direction), and the pair of straight portions 22 and 22 And a pair of arc portions 23 and 23 connected to each other. Accordingly, the straight portions 22 and 22 at one end portion of the power generating element 2 in the winding center direction become the positive electrode lead portion 21a, and the straight portions 22 and 22 at the other end portion of the power generating element 2 in the winding center direction are the negative electrode lead. Part 21b.

  The length in the longitudinal direction of the separator 20c is longer than the length in the longitudinal direction of the positive electrode plate 20a and the negative electrode plate 20b. The length in the direction orthogonal to the longitudinal direction of the separator 20c (the width in the direction corresponding to the first direction) is the length in the direction orthogonal to the longitudinal direction in the overlapping region of the superimposed positive electrode plate 20a and negative electrode plate 20b. It is slightly longer than the width (width). Thereby, the separator 20c is arrange | positioned in the whole area | region of the overlapping area | region of the superimposed positive electrode plate 20a and the negative electrode plate 20b. The separator 20c is wound more than the positive electrode plate 20a and the negative electrode plate 20b. Thereby, the separator 20c is located in the outermost periphery of the said electric power generation element 2. FIG.

  Then, as shown in FIG. 4, current collectors 3a and 3b are connected to positive electrode plate 20a and negative electrode plate 20b (positive electrode lead portion 21a and negative electrode lead portion 21b) at both ends of power generation element 2 in the first direction. And concentrated in the center side (winding center side) in the second direction orthogonal to the first direction. That is, each of the positive electrode plate 20a and the negative electrode plate 20b (the positive electrode lead portion 21a and the negative electrode lead portion 21b) at both ends of the power generation element 2 in the first direction is a plate material when the current collectors 3a and 3b are connected. Is sandwiched between clip members 32a and 32b that are folded in half, and the center of the second direction (the direction perpendicular to the winding center direction of the wound power generation element 2 and the flat direction of the power generation element 2) perpendicular to the first direction Concentrated on the side (winding center side).

  Accordingly, inclined portions 200a and 200b are formed on the outer surfaces on one end side and the other end side of the power generation element 2 in the first direction and on both outer surfaces of the power generation element 2 in the second direction. . That is, as the positive electrode plate 20a (positive electrode lead portion 21a) and the negative electrode plate 20b (negative electrode lead portion 21b) at both ends of the power generation element 2 in the first direction are assembled in the second direction, Inclined portions 200a and 200b are formed at the four corners of the power generation element 2 as viewed from the third orthogonal direction (the direction orthogonal to the winding center direction of the power generation element 2 and the flat direction of the power generation element 2). The inclined portions 200a and 200b are continuously formed on the center side of the power generating element 2 in the first direction with respect to the lead portions 21a and 21b (the positive electrode lead portion 21a and the negative electrode lead portion 21b). Each of the inclined portions 200a and 200b is inclined toward the center side in the second direction as it goes outward in the first direction.

  Returning to FIG. 2, each of the pair of current collectors 3 a and 3 b includes power generation element connection portions 30 a and 30 b arranged along the third direction, and fixing members extending from the power generation element connection portions 30 a and 30 b. Pieces 31a and 31b. In the present embodiment, each of the pair of current collectors 3a and 3b is formed by bending a rectangular metal plate so as to be perpendicular or substantially perpendicular in the longitudinal direction, and the bent ridge line of the metal plate is formed. One end side that is the boundary is the power generation element connection portions 30a and 30b, and the other end side that is the boundary of the bent ridge line of the metal plate is the fixing pieces 31a and 31b.

  The power generation element connection portions 30a and 30b are a first end P1 connected to the fixing pieces 31a and 31b, and a partition (case) facing the fixed partition (lid plate) 41 of the fixing pieces 31a and 31b. 4 (bottom part to be described later) 401 and a second end portion P2 located in the vicinity of 401. Accordingly, the length in the longitudinal direction of the power generation element connection portions 30a and 30b is slightly shorter than between the partition walls facing each other (between the cover plate 41 and the bottom portion 401) so as to define the internal space of the case 4. ing.

  The power generation element connection portions 30a and 30b are arranged along the end portion of the power generation element 2 in the first direction and extending in the third direction. And this electric power generation element connection part 30a, 30b is provided with connection piece 300a, 300b for connecting with the electric power generation element 2 electrically and mechanically between the 1st end part P1 and the 2nd end part P2. Yes. More specifically, the power generation element connection portions 30a and 30b are a pair of connection pieces 300a extending in the third direction with a space in the second direction between the first end portion P1 and the second end portion P2. 300b. The pair of connection pieces 300 a and 300 b are formed so as to be insertable into the winding center portion of the power generation element 2. In the present embodiment, the connection pieces 300a and 300b are formed so as to extend in the longitudinal direction in a region on one end side of the metal plate constituting the current collectors 3a and 3b (region to be the power generation element connection portions 30a and 30b). It is formed by twisting both sides of the slit.

  The fixing pieces 31a and 31b are formed in a rectangular shape. The fixing pieces 31a and 31b are formed with through holes 310a and 310b through which fastening members 6a and 6b described later are inserted.

  As shown in FIG. 4, one of the current collectors 3 a is electrically and electrically connected to the positive electrode lead portion 21 a of the power generation element 2 with the connection piece 300 a inserted into the winding center of one end of the power generation element 2 in the first direction. Mechanically connected. More specifically, the positive electrode lead portions 21a (the positive electrode plate 20a in a laminated state) on both sides of the winding center are sandwiched between separate clip members 32a (thin plates are folded in two). Thereby, the positive electrode lead part 21a (positive electrode plate 20a) is concentrated on the center side in the second direction. The connection piece 300a of one current collector 3a is inserted into the winding center on one end side of the power generation element 2 along the straight portions 22 and 22 of the power generation element 2. Then, the connection piece 300a of the one current collector 3a, the clip member 32a adjacent to the connection piece 300a, and the positive electrode lead portion 21a sandwiched between the clip members 32a can be used in various ways such as ultrasonic welding and laser welding. They are connected together by welding. Thereby, the positive electrode lead portion 21a (the positive electrode plate 20a in a laminated state) is connected to the connection piece 300a of one current collector 3a through the clip member 32a so as to be energized.

  On the other hand, the other current collector 3b is electrically and mechanically connected to the negative electrode lead portion 21b of the power generation element 2 with the connection piece 300b inserted into the winding center of the other end of the power generation element 2 in the first direction. Connected. More specifically, the negative electrode lead portions 21b (the negative electrode plate 20b in a laminated state) on both sides of the winding center are sandwiched by separate and independent clip members 32b (thin plates folded in two). Thereby, the negative electrode lead part 21b (negative electrode plate 20b) is concentrated on the center side in the second direction. The connection piece 300 b of one current collector 3 b is inserted into the winding center on one end side of the power generation element 2 along the straight portions 22 and 22 of the power generation element 2. Then, the connection piece 300b of the one current collector 3b, the clip member 32b adjacent to the connection piece 300b, and the negative electrode lead portion 21b sandwiched between the clip members 32b can be used in various ways such as ultrasonic welding and laser welding. They are connected together by welding. Thus, the negative electrode lead portion 21b (the negative electrode plate 20b in a laminated state) is connected to the connection piece 300b of one current collector 3b through the clip member 32b so as to be energized.

  Returning to FIG. 2, the case 4 includes a box-shaped case main body 40 having an opening 400 formed on one surface thereof, and a lid plate 41 that closes the opening 400 of the case main body 40. In the present embodiment, both the case main body 40 and the lid plate 41 are made of metal. Then, the cover plate 41 is welded to the case main body 40 so that the internal space of the case 4 is formed in an airtight manner.

  The case main body 40 is formed so as to accommodate the power generation element 2 and the current collectors 3a and 3b. In the present embodiment, the case body 40 is formed in a rectangular shape in plan view as the power generating element 2 is formed in a flat shape (flat spiral shape). That is, the case body 40 includes a bottom portion 401 having a rectangular shape in plan view, a pair of side wall portions 402 and 402 erected from both longitudinal ends of the bottom portion 401, and a pair of erected from both ends orthogonal to the longitudinal direction of the bottom portion 401. It is comprised by the front-and-back wall part 403,403. And the opening part 400 corresponding to the planar shape of the bottom part 401 is formed in the case main body 40 by the adjacent side wall part 402 and the front-and-back wall part 403 being connected.

  The power generation element 2 to which the current collectors 3a and 3b (power generation element connection portions 30a and 30b) are connected so that the longitudinal direction of the bottom portion 401 and the winding center direction of the power generation element 2 are in the same direction. Can be accommodated. And in the state which accommodated the electric power generation element 2 to which the electrical power collector 3a, 3b (electric power generation element connection part 30a, 30b) was accommodated, a pair of front-and-back wall part 403,403 and the outer periphery (linear part 22, 22) of the electric power generation element 2 ) And a gap between the pair of side wall portions 402, 402 and the current collectors 3a, 3b (power generation element connection portions 30a, 30b). The size of is set.

  The lid plate 41 is formed in a rectangular shape corresponding to the opening 400 of the case body 40. The lid plate 41 is provided with a pair of through holes 410a and 410b for inserting the fastening members 6a and 6b at intervals in the longitudinal direction. A step portion (not shown) is formed on the outer peripheral portion on one surface side of the cover plate 41. The outer periphery of the cover plate 41 is welded to the upper end portion of the case main body 40 (the upper ends of the side wall portions 402 and 402 and the front and rear wall portions 403 and 403) with the stepped portion being fitted into the opening 400 of the case main body 40. As a result, the cover plate 41 seals the opening 400 of the case body 40 (see FIG. 1).

  The output terminals 5a and 5b are connected to an electrical load or another battery. The output terminals 5a and 5b are formed in a shaft shape. More specifically, the output terminals 5a and 5b are constituted by shaft-like terminal portions 50a and 50b, and rotation-stop portions 51a and 51b connected to one end of the terminal portions 50a and 50b. The output terminals 5a and 5b are provided with screw grooves on the outer periphery of the terminal portions 50a and 50b, into which female screw members (for example, nuts) (not shown) can be screwed. That is, in this embodiment, bolt terminals are employed as the output terminals 5a and 5b. Note that the output terminals 5a and 5b according to the present embodiment are configured such that the rotation stop portions 51a and 51b are engaged with the rotation stop members 52a and 52b fixed to the outer surface of the case 4 (the cover plate 41). Rotation about an axis extending in a direction perpendicular to the outer surface of the slab is prevented.

  The current collectors 3a and 3b are fixed in the case 4 by the fastening members 6a and 6b inserted through the cover plate 41 (through holes 410a and 410b), as described above, and the pair of output terminals 5a and 5b. Electrically connected to the output terminals 5a and 5b of the corresponding polarity of 5b. That is, the battery 1 according to the present embodiment is electrically connected to the corresponding output terminals 5a and 5b of the pair of output terminals 5a and 5b with the current collectors 3a and 3b fixed to the case 4. Two fastening members 6a and 6b are provided.

  The fastening members 6a and 6b are shaft-like rivets that are inserted into the cover plate 41 of the case 4 and the fixing pieces 31a and 31b of the corresponding current collectors 3a and 3b of the pair of current collectors 3a and 3b. Parts 60a and 60b, and flange parts 61a and 61b connected to one end of the rivet parts 60a and 60b. The fastening members 6a and 6b are provided with other rivet portions (hereinafter referred to as connecting rod rivet portions) 62a and 62b on the side opposite to the rivet portions 60a and 60b.

  The fastening members 6a and 6b are independent of the output terminals 5a and 5b. Accordingly, the battery 1 includes two connection rods 64a and 64b for electrically connecting the fastening members 6a and 6b and the output terminals 5a and 5b. That is, the battery 1 has a connection rod 64a that electrically connects the positive output terminal 5a and one fastening member 6a, and a connection that electrically connects the negative output terminal 5b and the other fastening member 6b. And a collar 64b.

  The connecting rods 64a and 64b are constituted by strip-shaped metal plates. A pair of through holes (not numbered) are formed in the connecting rods 64a and 64b at intervals in the longitudinal direction.

  Then, the terminal portions 50a and 50b of the corresponding output terminals 5a and 5b of the pair of output terminals 5a and 5b are inserted into the one through hole, and the two fastening members 6a and 6b are inserted into the other through hole. The connecting rods 64a and 64b are configured such that the connecting rod rivet portions 62a and 62b of the corresponding fastening members 6a and 6b are inserted.

  The battery 1 has an inner surface of the cover plate 41 of the case 4 so as to correspond to the arrangement of the current collectors 3a and 3b in order to make the inside of the case 4 airtight while achieving electrical insulation from the metal case 4. A pair of external gaskets 8a and 8b disposed along the outer surface of the cover plate 41 of the case 4 so as to correspond to the arrangement of the pair of internal gaskets 7a and 7b and the current collectors 3a and 3b. And.

  The internal gaskets 7a and 7b are synthetic resin molded products having electrical insulation and sealing properties. In the present embodiment, the internal gaskets 7a and 7b are formed in a rectangular shape in plan view. Further, on one surface of the internal gaskets 7a and 7b (surface opposite to the surface along the inner surface of the cover plate 41), the corresponding current collectors 3a and 3b of the pair of current collectors 3a and 3b are arranged. Recesses 70a and 70b that can receive the fixing pieces 31a and 31b are formed. Further, through holes 71a and 71b are formed in the internal gaskets 7a and 7b. The through holes 71a and 71b are used for fixing in a state where the fixing pieces 31a and 31b of the corresponding collectors 3a and 3b of the pair of collectors 3a and 3b are received in the recesses 70a and 70b. It coincides with the through holes 310a and 310b formed in the pieces 31a and 31b.

  The outer gaskets 8a and 8b are synthetic resin molded products having electrical insulation and sealing properties, like the inner gaskets 7a and 7b. The external gaskets 8a and 8b have a size slightly larger than the flanges 61a and 61b of the fastening members 6a and 6b. The outer gaskets 8a and 8b are recessed on the upper surface except for the outer peripheral portion, and can accommodate the flange portions 61a and 61b of the corresponding fastening members 6a and 6b of the pair of fastening members 6a and 6b. . That is, the external gaskets 8a and 8b are formed with concave portions 80a and 80b having a rectangular shape in plan view that can receive the flange portions 61a and 61b of the fastening members 6a and 6b. Accordingly, outer wall portions 81a and 81b are formed around the recesses 80a and 80b of the outer gaskets 8a and 8b.

  The external gaskets 8a and 8b are through holes through which the rivet portions 60a and 60b of the fastening members 6a and 6b can be inserted in a state where the flange portions 61a and 61b of the fastening members 6a and 6b are accommodated in the recesses 80a and 80b. 82a and 82b are formed. Further, cylindrical portions 83a and 83b concentric with the through holes 82a and 82b through which the rivet portions 60a and 60b of the fastening members 6a and 6b are inserted are provided on the lower surfaces of the external gaskets 8a and 8b. The cylindrical portions 83a and 83b can be inserted into the inner holes (not numbered) of the rivet portions 60a and 60b of the fastening members 6a and 6b. The cylindrical portions 83a and 83b are inserted into the through holes 410a and 410b of the lid plate 41 and the through holes 71a and 71b of the internal gaskets 7a and 7b connected to the through holes 410a and 410b. The lower surfaces of the external gaskets 8a and 8b (surfaces opposite to the open portions of the recesses 80a and 80b) are formed on the cylindrical portions 83a and 83b through holes 410a and 410b in the cover plate 41 and through holes 71a in the internal gaskets 7a and 7b. In the state inserted in 71b, it adhere | attaches on the outer surface of the cover board 41. FIG. Thereby, the rotation around the axis extending in the direction orthogonal to the outer surface of the cover plate 41 is prevented.

  The rivet portions 60a and 60b of the fastening members 6a and 6b are disposed in the outer gaskets 8a and 8b (through holes 82a and 82b and the cylindrical portions 83a and 83b) and the recesses 70a and 70b of the inner gaskets 7a and 7b. The current collectors 3a and 3b are continuously inserted into the fixing pieces 31a and 31b (through holes 310a and 310b). In the rivet portions 60a and 60b of the fastening members 6a and 6b, the tip portions protruding inward from the current collectors 3a and 3b (fixing pieces 31a and 31b) are caulked. The connecting rod rivet portions 62a and 62b of the fastening members 6a and 6b are inserted into the other through holes of the connecting rods 64a and 64b. Then, in the connecting rod rivet portions 62a and 62b of the fastening members 6a and 6b, the tip portions protruding outward from the connecting rods 64a and 64b are caulked.

  Thus, the current collectors 3 a and 3 b are electrically connected to the fastening members 6 a and 6 b and the connecting rods 64 a and 64 b in a state of being fixed to the case 4. At the same time, the fastening members 6a and 6b press the inner gaskets 7a and 7b and the outer gaskets 8a and 8b against the inner and outer surfaces of the cover plate 41, and the cylindrical portions 83a and 83b of the outer gaskets 8a and 8b. It is compressed and deformed (expanded in the radial direction). Thereby, the space between the rivet portions 60a and 60b and the inner peripheral surface defining the through holes 410a and 410b of the lid plate 41 is sealed. The output terminals 5a and 5b are merely inserted through the terminal portions 50a and 50b into one through hole of the connecting rods 64a and 64b. However, when female screw members (not shown) are screwed and tightened to the terminal portions 50a and 50b, the locking portions 51a and 51b and the connecting rods 64a and 64b are brought into close contact with each other, and each of the pair of output terminals 5a and 5b is The connection rods 64a and 64b and the fastening members 6a and 6b are electrically connected to the current collectors 3a and 3b.

  And the battery 1 which concerns on this embodiment is equipped with a pair of spacer members 9a and 9b arrange | positioned along the both ends of the electric power generation element 2 in said 1st direction, as shown in FIG.2 and FIG.3.

  Each of the pair of spacer members 9a and 9b is a pair of spacer main body portions 90a and 90b disposed on both sides in the second direction of the corresponding end portions of the power generation element 2 in the first direction. And a pair of spacer body portions 90a, 90b that are in close contact with the partition wall 403 of the case 4, and connecting portions 91a, 91b that connect the pair of spacer body portions 90a, 90a, 90b, 90b to each other. .

  In each of the pair of spacer members 9 a and 9 b, each of the pair of spacer main body portions 90 a, 90 a, 90 b, and 90 b is adjacent to the opposing partition 403 among the partitions that define the internal space of the case 4. Accordingly, the pair of spacer main body portions 90 a and 90 b include contact portions 94 a and 94 b along the inner surface of the partition wall of the adjacent case 4. In the present embodiment, the contact portions 94a and 94b of the spacer main body portions 90a and 90b are formed in a planar shape. In the present embodiment, the contact portions 94a and 94b of the spacer main body portions 90a and 90b are in close contact with the front and rear wall portions 403 that are adjacent partition walls. That is, the contact portions 94a and 94b of the spacer main body portions 90a and 90b are disposed without a gap or substantially without a gap with respect to the front and rear wall portions 403 that are adjacent partition walls. The power generating element 2, the pair of current collectors 3a and 3b, and the spacer members 9a and 9b are accommodated in the case 4 in a state of being encased in an insulating bag (not shown) having electrical insulation. Therefore, in the battery 1 according to the present embodiment, the spacer main body portions 90a and 90b (contact portions 94a and 94b) of the pair of spacer members 9a and 9b are placed on the front and rear wall portions 403 and 403 of the case 4 with the insulating bag interposed therebetween. Close. That is, the spacer main body portions 90 a and 90 b (contact portions 94 a and 94 b) of the spacer members 9 a and 9 b of the battery 1 according to this embodiment are in intimate contact with the front and rear wall portions 403 of the case 4.

  As shown in FIG. 4, each of the pair of spacer main body portions 90 a and 90 b is a support portion (hereinafter referred to as a first support portion) that is in close contact with the inclined portions 200 a and 200 b adjacent to the end portion of the power generation element 2 facing the self. 92a and 92b are provided. In addition, each of the pair of spacer main body portions 90a and 90b is directly or indirectly in close contact with the end of the power generation element 2 facing itself (the end of the power generation element 2 in which the positive electrode plate 20a or the negative electrode plate 20b are assembled). The other support part (henceforth the 2nd support part) 93a, 93b is provided.

  The first support portions 92a and 92b and the second support portions 93a and 93b are formed continuously in the first direction on the back side of the contact portions 94a and 94b. Each of 1st support part 92a, 92b and 2nd support part 93a, 93b is comprised by the smooth surface. The first support portions 92a and 92b are inclined toward the contact portions 94a and 94b from the base ends connected to the second support portions 93a and 93b toward the tip opposite to the base ends. In the present embodiment, the positive electrode plate 20a and the negative electrode plate 20b at both ends in the first direction of the power generating element 2 are partially gathered by being surrounded (clipped) by the clip members 32a and 32b. Therefore, the inclined portions 200a and 200b on the outer periphery of the power generation element 2 are formed corresponding to the region to which the clip members 32a and 32b are attached. Accordingly, the first support portions 92a and 92b are formed with reference to the arrangement of the clip members 32a and 32b.

  The second support portions 93a and 93b are formed to be parallel or substantially parallel to the contact portions 94a and 94b. In the present embodiment, the second support portions 93a and 93b are in close contact with the clip members 32a and 32b enclosing the lead portions 21a and 21b (the positive plate 20a or the negative plate 20b).

  Each of the pair of spacer main body portions 90a and 90b is in a state where the contact portions 94a and 94b are in close contact with the case 4 (front and rear wall portions 403), and the first support portions 92a and 92b are inclined portions 200a, The second support portions 93a and 93b are in pressure contact with the clip members 32a and 32b while being in pressure contact with 200b.

  In the present embodiment, each of the pair of spacer main body portions 90a and 90b can be fitted to each of both end portions in the second direction of the power generation element connection portions 30a and 30b of the current collectors 3a and 3b, as shown in FIG. Is formed. Specifically, as shown in FIG. 2, grooves 95a and 95b extending in the third direction are provided on the mutually opposing surfaces of the pair of spacer main body portions 90a and 90b. The grooves 95a and 95b are formed so that the end portions in the short direction of the power generation element connection portions 30a and 30b can be fitted. Thereby, as shown in FIG. 3, the pair of spacer main body portions 90a and 90b sandwich the power generation element connecting portions 30a and 30b of the current collectors 3a and 3b in the second direction. That is, the power generation element connection portions 30a and 30b of the pair of current collectors 3a and 3b are interposed between the pair of spacer main body portions 90a and 90b, and both ends of the power generation element connection portions 30a and 30b in the second direction. Each of the portions is fitted to each of a pair of spacer main bodies 90a and 90b arranged on both sides.

  As described above, the power generation element connection portions 30a and 30b are formed with a pair of connection pieces 300a and 300b by twisting both sides of the slit provided in the metal plate. Therefore, the power generation element connection portions 30a and 30b have a width in the second direction at an intermediate position between the first end portion P1 and the second end portion P2 (region where the connection pieces 300a and 300b exist). It is narrower than the width in the second direction on the part P1 side and the second end part P2 side.

  Accordingly, the grooves 95a, 95b are provided in a predetermined region on one end side and a predetermined region on the other end side in the longitudinal direction of the spacer main body portions 90a, 90a, 90b, 90b. That is, the grooves 95a and 95b of the pair of spacer main body portions 90a and 90b are regions corresponding to the connection pieces 300a and 300b of the power generation element connection portions 30a and 30b of the current collectors 3a and 3b (the clip members 32a and 32b are attached). (Except area).

  The spacer main body portions 90a, 90a, 90b, 90b of the present embodiment are arranged in the arrangement of the inclined portions 200a, 200b, the clip members 32a, 32b, and the current collectors 3a, 3b (power generation element connection portions 30a, 30b) of the power generation element 2. Correspondingly, the first support portions 92a and 92b, the second support portions 93a and 93b, and the grooves 95a and 95b are formed in the first support portions 92a and 92b and the second support from the center side in the first direction toward the outside. The portions 93a and 93b and the grooves 95a and 95b are arranged in this order.

  And the said connection parts 91a and 91b are arrange | positioned along the said another partition (bottom part 401 of case 4) (refer FIG. 1). And as for connection part 91a, 91b, the 2nd end part P2 of the electric power generation element connection part 30a, 30b of corresponding current collector 3a, 3b among a pair of collectors 3a, 3b is connected.

  Specifically, the connecting portions 91a and 91b connect the ends of the pair of spacer main body portions 90a and 90b as shown in FIG. Accordingly, the connecting portions 91a and 91b are slits capable of press-fitting the second end portions P2 of the power generation element connection portions 30a and 30b of the corresponding current collectors 3a and 3b of the pair of current collectors 3a and 3b. Portions 96a and 96b are formed. Thereby, the 2nd end part P2 of each electric power generation element connection part 30a, 30b of a pair of collectors 3a, 3b is restrained by spacer member 9a, 9b (connection part 91a, 91b). In the present embodiment, the slit portions 97a and 97b are formed continuously with the grooves 95a and 95b formed in the pair of spacer main body portions 90a and 90b. Thereby, as shown in FIG. 3, the periphery of the second end portion P2 of each of the power generation element connection portions 30a and 30b of the pair of current collectors 3a and 3b is constrained.

  The battery 1 according to the present embodiment is as described above. According to this battery 1, as shown in FIG. 4, the inclined portions 200 a, formed at both ends (four corners) of the power generating element 2 by the spacer main body portions 90 a, 90 a, 90 b, 90 b of the pair of spacer members 9 a, 9 b. Deformation of 200b (electrode plates 20a and 20b) and electrode plates 20a and 20b inside the inclined portions 200a and 200b (deformation associated with vibration in the first direction and vibration in the second direction) is prevented.

  Specifically, the movement of the spacer main bodies 90a, 90a, 90b, 90b of the spacer members 9a, 9b within the case 4 is restricted by the close contact with the partition walls (front and rear wall portions 403) of the case 4. Then, the first support portions 92a and 92b of the spacer main body portions 90a, 90a, 90b, and 90b whose movement is restricted prevent the inclined portions 200a and 200b from being deformed. That is, when the first support portions 92a and 92b of the spacer main body portions 90a, 90a, 90b, and 90b are in surface contact with the opposed inclined portions 200a and 200b, the electrode plates 20a and 20b constituting the inclined portions 200a and 200b are formed. It maintains in the state (stretched state) along the 1st support parts 92a and 92b. Along with this, deformation of the electrode plates 20a and 20b in a laminated state inside the inclined portions 200a and 200b is also restricted. Therefore, the electrode plates 20a and 20b constituting the inclined portions 200a and 200b in the power generation element 2 and the electrode plates 20a and 20b inside the inclined portions 200a and 200b can be prevented from being freely deformed, and the electrode plates 20a, 20b, Damage to 20b can be prevented.

  The inclined portions 200a and 200b at the four corners of the power generation element 2 are portions that extend in a direction that intersects the combined direction of the swinging directions (first direction and second direction) of the power generation element 2. Therefore, the force (the force in the direction corresponding to the moving direction) when the power generating element 2 tries to swing in any of the first direction, the second direction, or the combined direction thereof is along the inclined portions 200a and 200b. The first support portions 92a and 92b receive them. Thereby, the movement to the 1st direction of the electric power generation element 2, a 2nd direction, or these synthetic | combination directions is controlled. Accordingly, the swinging of the current collectors 3a and 3b connected to the power generation element 2 is also restricted.

  Therefore, even if the vibration of the device is transmitted to the battery 1, the electrode plates 20a and 20b constituting the inclined portions 200a and 200b and the electrode plates 20a and 20b inside the inclined portions 200a and 200b are prevented from being repeatedly deformed. The In addition, it is possible to suppress the repeated stress from acting on the current collectors 3 a and 3 b connected to the power generation element 2. Thereby, the battery 1 can prevent the electrode plates 20a and 20b and the current collectors 3a and 3b of the power generation element 2 from being damaged.

  In particular, the first end portion P1 of the power generation element connection portions 30a and 30b is connected to the fixing pieces 31a and 31b fixed to the case 4, and the second end portion P2 of the power generation element connection portions 30a and 30b is By being connected to the connecting portions 91a and 91b of the spacer members 9a and 9b fixed in the case 4, the first end portion P1 and the second end portion P2 of the power generation element connecting portions 30a and 30b are fixed at fixed positions. It becomes a state. Further, the width direction (second direction) of the power generating element connection portions 30a and 30b of the current collectors 3a and 3b with respect to the grooves 95a, 95a, 95b and 95b of the pair of spacer main body portions 90a, 90a, 90b and 90b, respectively. By fitting each of the both ends, both ends of the power generation element connection portions 30a and 30b in the width direction (second direction) are also fixed in place.

  Thereby, it can control reliably that the whole electric power generation element connection part in each of a pair of electrical power collectors rock | fluctuates. Therefore, the battery 1 can reliably prevent the current collectors 3a and 3b from being damaged.

  In addition, this invention is not limited to the said embodiment, Of course, it can change suitably in the range which does not deviate from the summary of this invention.

  In the said embodiment, although the lithium ion battery was mentioned as an example of an electrical storage element, an electrical storage element is not limited to a lithium ion battery. For example, the storage element may be another battery such as a nickel metal hydride battery or a capacitor (such as an electric double layer capacitor).

  In the above embodiment, the spacer main bodies 90a and 90b (contact portions 94a and 94b) of the spacer members 9a and 9b are in close contact (indirect contact) with the front and rear wall portions 403 and 403 of the case 4 with the insulating bag interposed therebetween. However, the present invention is not limited to this. For example, after spacer elements 9a and 9b are attached to a power generation element 2 and a pair of current collectors 3a and 3b wrapped in an insulating bag (not shown) having electrical insulation properties, these are accommodated in a case 4 May be. In this case, the spacer main body portions 90 a and 90 b (contact portions 94 a and 94 b) of the spacer members 9 a and 9 b are in direct contact with the front and rear wall portions 403 and 403 of the case 4. Thereby, like the said embodiment, the 1st support parts 92a and 92b of the spacer members 9a and 9b (spacer main-body part 90a, 90b) by which the movement was controlled closely_contact | adhere to the inclination parts 200a and 200b of the electric power generation element 2. FIG.

  Accordingly, as in the above embodiment, the inclined portions 200a and 200b (electrode plates 20a and 20b) formed at both ends (four corners) of the power generating element 2 and the electrode plates 20a and 20b inside the inclined portions 200a and 200b. Deformation (deformation associated with vibration in the first direction and vibration in the second direction) is prevented. Thereby, the electrode plates (positive electrode plate 20a and negative electrode plate 20b) constituting the inclined portions 200a and 200b in the power generation element 2 and the electrode plates (positive electrode plate 20a and negative electrode plate 20b) inside the inclined portions 200a and 200b are free. Deformation of the electrode plate (positive electrode plate 20a, negative electrode plate 20b) can be prevented. Therefore, the bending action does not repeatedly act on the power generation element 2 and the current collectors 3a and 3b connected to the power generation element 2, and the power generation element 2 and the current collectors 3a and 3b are prevented from being damaged.

  Although the electrical storage element 1 of the said embodiment was provided with a pair of spacer members 9a and 9b arrange | positioned along the both ends of the electric power generation element 2 in a 1st direction, the electrical storage element 1 is not limited to this. . For example, as illustrated in FIGS. 5 and 6, the power storage element 1 is disposed along one of the both end edges (positive electrode lead portion 21 a or negative electrode lead portion 21 b) of the power generation element 2 in the first direction. The spacer member 9a may be provided. That is, the electricity storage element 1 may include one spacer member 9a. Also in this case, the pair of spacer main body portions 90a and 90a of the spacer member 9a are disposed on both sides in the second direction of the corresponding end portions of the power generating element 2 in the first direction. 4 close to the partition walls 402 and 403. That is, the pair of spacer main body portions 90 a and 90 a are arranged in the case 4 in a state where movement from the inside of the case 4 to the outside is restricted.

  Accordingly, the first support portions (support portions) 92a and 92a of the spacer main body portions 90a and 90a whose movement is restricted are in a state (close state) along the inclined portions 200a and 200a of the opposing power generation element 2. Maintain with. Accordingly, the inclined portions 200a and 200a (electrode plate 20a) in the power generation element 2 are restrained by the first support portions 92a and 92a, and deformation of the inclined portions 200a and 200a with respect to vibration in the second direction is restricted. Accordingly, deformation of the electrode plate 20a inside the inclined portions 200a and 200a with respect to vibration in the second direction is also restricted. Thereby, it is possible to prevent the electrode plate (positive electrode plate) 20a constituting the inclined portions 200a and 200a in the power generation element 2 and the electrode plate (positive electrode plate) 20a inside the inclined portions 200a and 200a from being freely deformed, Damage to the electrode plate 20a can be prevented. Therefore, the bending action does not repeatedly act on the power generation element 2 and the current collectors 3a and 3b connected to the power generation element 2, and the power generation element 2 and the current collectors 3a and 3b are prevented from being damaged.

  Also in the electricity storage device 1 having the above-described configuration, the spacer main body portions 90 a and 90 a (first support portions 92 a and 92 a) are in surface contact with the inclined portions 200 a and 200 a of the power generation element 2. Therefore, when the spacer main body portions 90a and 90a restrain the power generation element 2, the electrode plate (positive electrode plate) 20a does not collide with the spacer main body portions 90a and 90a, and the power generation element 2 is provided by providing the spacer member 9a. Will not be damaged. In addition, although the spacer member 9a shown in FIG.5 and FIG.6 is arrange | positioned along one edge (positive electrode lead part 21a) of the both ends of the electric power generation element 2 in a 1st direction, You may arrange | position along the other edge (negative electrode lead part 21b) of the both ends of the electric power generation element 2 in a 1st direction.

  In the spacer members 9a and 9b of the above embodiment, the lower end portions of the spacer main body portions 90a and 90b are connected by the connecting portions 91a and 91b. However, the present invention is not limited to this. For example, the upper ends of the pair of spacer main body portions 90a and 90b may be connected by the connecting portions 91a and 91b, and the lower ends of the pair of spacer main body portions 90a and 90b may be connected by the connecting portions 91a and 91b. That is, the spacer members 9a and 9b may be formed in a frame shape. Moreover, it is not limited to what the edge part of a pair of spacer main-body part 90a, 90b was connected, For example, the middle positions of a pair of spacer main-body part 90a, 90b are connected by the connection part. There may be.

  In the above embodiment, the current collectors 3a and 3b (the current collectors 3a and 3b (the current collectors 3a and 3b) are press-fitted into the slits 96a and 96b of the connecting portions 91a and 91b. Although the power generation element connection portions 30a and 30b) are connected to the spacer members 9a and 9b (connection portions 91a and 91b), the present invention is not limited to this. For example, the second ends P2 of the current collectors 3a and 3b (power generation element connection portions 30a and 30b) may be free ends without being connected to the spacer members 9a and 9b (connection portions 91a and 91b). Even in this case, the spacer main body portions 90 a and 90 b are in close contact with the inner surface of the case 4 in a state where the first support portions 92 a and 92 b of the spacer main body portions 90 a and 90 b are along the inclined portions 200 a and 200 b of the power generation element 2. Thus, the movement (swing) of the power generation element 2 can be restricted. Thereby, rocking | fluctuation of the electric power generation element 2 and current collector 3a, 3b can be controlled. Therefore, damage to the power generation element 2 and the current collectors 3a and 3b is prevented. However, in order to reliably regulate the swinging of the current collectors 3a and 3b, it is preferable that the second ends P2 of the power generation element connection portions 30a and 30b are coupled to the coupling portions 91a and 91b.

  In the above-described embodiment, the grooves 95a provided at the opposite ends of the pair of spacer main body portions 90a and 90b at both ends in the second direction of the power generation element connection portions 30a and 30b of the pair of current collectors 3a and 3b, respectively. , 95b, but is not limited to this. For example, in a state where the power generation element connection portions 30a and 30b are interposed between the pair of spacer main body portions 90a and 90b, both end portions in the second direction of the power generation element connection portions 30a and 30b are connected to the pair of spacer main body portions 90a and 90b. On the other hand, it may be non-contact. That is, only the second end portion P2 of the power generation element connecting portions 30a and 30b is connected to the connecting portions 91a and 91b constituting the spacer members 9a and 9b, and the current collectors 3a and 3b are connected to the spacer members 9a and 9b. It may not be connected at all (not supported). Even in this case, the spacer main body portions 90 a and 90 b are in close contact with the inner surface of the case 4 in a state where the first support portions 92 a and 92 b of the spacer main body portions 90 a and 90 b are along the inclined portions 200 a and 200 b of the power generation element 2. Thus, the movement (swing) of the power generation element 2 can be restricted.

  In the above embodiment, the power generation element connection portions 30a and 30b (connection pieces 300a and 300b) are connected to the clip members 32a and 32b surrounding the electrode plates 20a and 20b gathered in the second direction. It is not limited. For example, the power generation element connection portions 30a and 30b (connection pieces 300a and 300b) may be directly superimposed on the electrode plates 20a and 20b concentrated in the second direction. In this case, it is preferable that the electrode plates 20a and 20b and the power generation element connection portions 30a and 30b (connection pieces 300a and 300b) are collectively surrounded by the clip members 32a and 32b.

  In the said embodiment, although the output terminals 5a and 5b and fastening member 6a, 6b were set as the independent structure, it is not limited to this. For example, the output terminals 5a and 5b and the fastening members 6a and 6b may be integrally formed. In this case, the locking members 52a and 52b and the connecting rods 64a and 64b are not necessary. Therefore, it is preferable that the external gaskets 8a and 8b and the output terminals 5a and 5b (or the fastening members 6a and 6b) have a rotation preventing function.

  In the said embodiment, although the electrical storage element 1 provided with the winding type electric power generation element 2 wound in the state in which the elongate positive electrode plate 20a and the negative electrode plate 20b were piled up was demonstrated, it is limited to this is not. For example, a power generation element including a sheet-like separator 20c having electrical insulation, and a sheet-like positive electrode plate 20a and a negative electrode plate 20b that are stacked in a state of being relatively displaced in the first direction across the separator 20c. 2 may be a power storage device 1 having two. Also in this case, only the positive electrode plate 20 a is stacked on one end portion of the power generation element 2 in the first direction, and only the negative electrode plate 20 b is stacked on the other end portion of the power generation element 2 in the first direction. Then, when the current collectors 3a and 3b are connected to the power generation element 2, the electrode plates 20a and 20b at both ends in the first direction of the power generation element 2 are concentrated on the center side in the second direction. Thereby, inclined part 200a, 200b is formed on the outer surface of the both sides of a 2nd direction in each of the one side of the 1st direction of the electric power generation element 2, and the other side. Therefore, similarly to the above-described embodiment, by providing the spacer members 9a and 9b, the swinging of the power generating element 2 and the current collectors 3a and 3b can be restricted and the breakage thereof can be prevented.

  In the said embodiment, although the electrical power collector 3a, 3b which has the electric power generation element connection part 30a, 30b in which the connection piece 300a, 300b was formed in the middle position was employ | adopted, it is not limited to this. For example, current collectors 3a and 3b having power generation element connection portions 30a and 30b formed with connection pieces 300a and 300b that are bifurcated on the first end portion P1 side or the second end portion P2 side are employed. Also good.

  Further, in the above embodiment, the connecting pieces 300a, 300b of the power generating element connection portions 30a, 30b are disposed between layers (in the above embodiment, the winding center) in the middle of the stacked electrode plates 20a, 20b constituting the power generating element 2. However, the present invention is not limited to this. For example, as illustrated in FIG. 8, the power generation element connection portions 30 a and 30 b (connection pieces 300 a and 300 b) may be arranged along the outer surface at the end portion in the first direction of the power generation element 2.

  Moreover, in the said embodiment, although the contact parts 94a and 94b of the spacer main-body parts 90a and 90b were closely_contact | adhered only to the front-and-back wall part 403, it is not limited to this. For example, when the pair of front and rear wall portions 403 and 403 and the pair of side wall portions 402 and 402 form a frame shape as in the above embodiment, the spacer main body portions 90a and 90b include the front and rear wall portions 403 and the front and rear wall portions. It may be formed so as to be in close contact with the side wall portion 402 adjacent to 403. That is, the spacer main body portions 90 a and 90 b may include a contact portion that is in close contact with the front and rear wall portion 403 and another contact portion that is in close contact with the side wall portion 402 adjacent to the front and rear wall portion 403. If it does in this way, the two contact parts (two surfaces) of spacer main-body part 90a, 90b will be restrained, and it will be positioned in a fixed position.

  In the above embodiment, each of the pair of output terminals 5a and 5b arranged on the outside of the case 4 is composed of the same type of bolt terminals, but the present invention is not limited to this. For example, either one of the pair of output terminals 5 a and 5 b may be configured on the outer surface of the case 4. That is, one of the pair of current collectors 3a and 3b is mechanically and electrically connected to the case 4 (the case main body 40 or the cover plate 41) via the fastening members 6a and 6b. By being connected, the outer surface of the case 4 (the case main body 40 or the cover plate 41) may constitute any one of the output terminals 5a and 5b disposed outside the case 4. In this case, the other output terminal 5a, 5b of the pair of output terminals 5a, 5b is fixed to the case 4 with the same bolt terminal as in the above embodiment or the current collectors 3a, 3b of the corresponding polarity. What is necessary is just to be comprised by the fastening members 6a and 6b to perform.

  DESCRIPTION OF SYMBOLS 1 ... Power storage element, 2 ... Power generation element, 3a, 3b ... Current collector, 4 ... Case, 5a, 5b ... Output terminal, 6a, 6b ... Fastening member, 7a, 7b ... Internal gasket, 8a, 8b ... External gasket, 9a, 9b ... spacer member, 20a ... positive electrode plate (electrode plate), 20b ... negative electrode plate (electrode plate), 20c ... separator, 21a ... positive electrode lead part (lead part), 21b ... negative electrode lead part (lead part), 22 ... Linear part, 23 ... Arc part, 30a, 30b ... Power generation element connection part, 31a, 31b ... Fixing piece part, 32a, 32b ... Clip member, 40 ... Case body, 41 ... Cover plate (partition wall), 50a, 50b ... terminal part, 51a, 51b ... stop part, 52a, 52b ... stop member, 60a, 60b ... rivet part, 61a, 61b ... collar part, 62a, 62b ... rivet part for connection rod (another rivet part), 64a, 6 b: Connection rod, 70a, 70b ... Recess, 71a, 71b ... Through hole, 80a, 80b ... Recess, 81a, 81b ... Outer wall, 82a, 82b ... Through hole, 83a, 83b ... Cylindrical part, 90a, 90b ... Spacer main body, 91a, 91b ... connecting part, 92a, 92b ... first support part (support part), 93a, 93b ... second support part (another support part), 94a, 94b ... contact part, 95a, 95b ... Groove, 96a, 96b ... slit part, 200a, 200b ... inclined part, 300a, 300b ... connection piece, 310a, 310b ... through hole, 400 ... opening part, 401 ... bottom part, 402 ... side wall part, 403 ... front and rear wall part, 410a, 410b ... through hole, P1 ... first end, P2 ... second end

Claims (4)

A power generation element including a separator having electrical insulation, and a positive electrode plate and a negative electrode plate that are superimposed in a state of being relatively displaced in the first direction with the separator interposed therebetween;
A pair of current collectors each electrically connected to a corresponding polar plate of the positive electrode plate and the negative electrode plate at both ends of the power generation element in the first direction;
A case having a partition wall defining an internal space for accommodating the power generation element and the pair of current collectors;
A pair of output terminals disposed outside the case;
A spacer member disposed along at least one of the two end edges of the power generation element in the first direction,
Each of the positive electrode plate and the negative electrode plate at both ends of the power generation element in the first direction is concentrated on the center side in the second direction orthogonal to the first direction,
On the outer surfaces of the one end side and the other end side of the power generation element in the first direction, on the outer surfaces on both sides of the power generation element in the second direction, the positive plates at both ends of the power generation element and the An inclined part is formed with each concentration of the negative electrode plate,
Each of the pair of current collectors is
A power generation element connection portion disposed along a third direction orthogonal to the first direction and the second direction, the positive electrode plate and the negative electrode being concentrated at both ends of the power generation element in the first direction A power generating element connection that is electrically connected to a corresponding polarity plate of the plates;
A fixing piece extending from the power generating element connecting portion, and is electrically connected to an output terminal having a corresponding polarity of the pair of output terminals while being fixed to the partition wall of the case. A fixing piece,
The spacer member is a pair of spacer main body portions disposed on both sides in the second direction of corresponding end portions of the power generation elements in the first direction, and is in close contact with the partition wall of the case. A pair of spacer main body portions, and a connecting portion for connecting the pair of spacer main body portions to each other,
Each of the pair of spacer main body portions includes a support portion that is in close contact with the inclined portion of the power generation element. A pair of the spacer members are provided,
The power storage element according to claim 1, wherein the pair of spacer members are disposed along both end edges of the power generation element in the first direction. The power generation element connection portion has a first end connected to the fixing piece, and a second end located in the vicinity of the partition facing the partition fixed to the fixing piece,
The connecting portion of the spacer member is disposed along the partition facing the partition fixed to the fixing piece, and the power generating element connection in the corresponding current collector of the pair of current collectors The electric storage element according to claim 1, wherein second end portions of the portions are connected. The power generating element connection portion of the corresponding current collector of the pair of current collectors is interposed between the pair of spacer main body portions in the spacer member,
The electric storage element according to any one of claims 1 to 3, wherein each of both end portions in the second direction of the power generation element connection portion is fitted to each of a pair of spacer bodies arranged on both sides.

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