JP5323645B2 - Power storage device, power storage module and automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power storage device in which the number of parts is reduced and assembling performance is improved without sacrificing performance and safety. <P>SOLUTION: A cell unit is equipped with a case 10 to house a wound-round body 22 in which a positive and a negative electrodes are arranged via a separator and an electrolytic solution infiltrated into the wound-round body 22, and a resin holder 25 to hold the case 10. The case 10 and the holder 25 are integrally molded by insertion molding, and a supply air duct 17 to supply cooling air to cool the case 10 and an exhaust air duct 19 to exhaust the cooling air of which the temperature has risen by heat exchange with the case 10 are formed in the peripheral part of the holder 25. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an electricity storage device, an electricity storage module, and an automobile, and in particular, an electricity storage device including a case containing an electrode group in which positive and negative electrodes are arranged via a separator and an electrolyte solution infiltrating the electrode group, and the electricity storage device. The present invention relates to a power storage module and a vehicle including the power storage module.

  Generally, power storage devices such as secondary batteries and capacitors include an electrode group in which positive and negative electrodes are arranged via a separator, and an electrolyte solution that infiltrates the electrode group. The electrode group and the electrolyte solution are accommodated in a case. Has been.

  The electrode group is roughly classified into a wound electrode group in which positive and negative electrodes are wound through a separator, and a laminated electrode group in which positive and negative electrodes are stacked through a separator. As the wound electrode group, there are known a cylindrical type in which positive and negative electrodes are wound in a cylindrical shape via a separator, and a flat type in which the positive and negative electrodes are wound in a flat shape. In addition, some wound electrode groups may or may not have an axial center at the winding center. As the laminated electrode group, one in which a separator is interposed between positive and negative electrodes and one in which one of positive and negative electrodes is covered with a bag-like separator are known. In the secondary battery, the electrolyte is roughly classified into a non-aqueous electrolyte used mainly for 4V batteries and an aqueous electrolyte used mainly for 2V batteries. In recent years, a lithium ion secondary battery that has been actively developed is generally a nonaqueous electrolytic solution in which an electrolyte containing a lithium salt is dissolved in an organic solvent. Various types of cases such as a cylindrical shape, a flat shape, and a square shape are known. Since the case contains an electrode group and an electrolytic solution, the case is generally composed of a container and a lid that closes the opening of the container.

  Usually, a plurality of such power storage devices are connected in series or in series-parallel. In recent years, several tens to hundreds of secondary batteries are used in hybrid electric vehicles (HEV) and genuine electric vehicles (PEV) that have been put to practical use, and four to several secondary batteries (single cells) are used. About ten battery modules (assembled batteries) connected in series or series-parallel are configured, and a plurality of battery modules are connected in series or series-parallel as necessary to serve as a power source.

  When a power source is configured by connecting a large number of power storage devices in this way, heat is generated by charging and discharging the power storage devices, so that the battery performance of each power storage device is kept constant and the life as a power storage module is maintained. Will require cooling. In addition, when used as a power source for a mobile unit as described above, it is necessary to adopt a vibration-proof structure, and in addition to safety in the event of battery abnormality in the storage device (for example, safety against overcharge, traffic accidents) It is necessary to consider in terms of safety against foreign object piercing and crushing. Furthermore, in order to improve the performance (volume output density) per unit volume, it is necessary to reduce the size of the power storage module.

  Such a problem has been examined in various prior arts that have already been disclosed. For example, a structure of a gas discharge duct is disclosed for the purpose of discharging gas ejected by releasing internal pressure of a secondary battery to the outside of the vehicle (see, for example, Patent Document 1). In addition, for the purpose of cooling each single cell constituting the battery module, there is disclosed a structure in which a gap is formed between the single cells, the cooling air is supplied by an air supply duct, and the air is exhausted by an exhaust duct. (For example, refer to Patent Document 2). Furthermore, for the purpose of connecting the cells in series, a structure is disclosed in which the positive electrode terminal of the cell and the negative electrode terminal of the adjacent cell are connected by a metal plate (bus bar) (see, for example, Patent Document 3). ).

JP 2006-049136 A JP 2008-269985 A JP 2005-327777 A

  However, in the prior art, in order to ensure performance and safety, there is a problem that the number of parts constituting the power storage module is large and it takes time to assemble the power storage module. For example, in the technique disclosed in Patent Document 2, an air supply duct and an exhaust duct are provided separately from each single cell constituting the battery module. This leads to an increase in weight and cost of the power storage module.

  In view of the above-described case, the present invention provides a power storage device that reduces the number of components and improves assembly without sacrificing performance and safety, a power storage module including the power storage device, and a vehicle including the power storage module. The issue is to provide.

  In order to solve the above problem, a first aspect of the present invention is an electricity storage device, and a case containing an electrode group in which positive and negative electrodes are arranged via a separator and an electrolyte solution infiltrating the electrode group; A holding member made of resin that holds the case, and the case and the holding member are integrally formed by insert molding, and cooling air for cooling the case is supplied to a peripheral portion of the holding member And an exhaust duct for discharging cooling air heated by heat exchange with the case.

  In this aspect, since the case and the resin holding member are integrally formed by insert molding, the strength of the case is improved by the holding member, and the air supply duct and the exhaust duct are integrated with the peripheral portion of the holding member. Therefore, a member for configuring these ducts is not required in addition to the components configuring the power storage device, so that the number of components can be reduced and the assemblability can be improved.

  In this aspect, the positive and negative electrodes of the electrode group may be led out to the end surface of the holding member via positive and negative electrode conductive members inserted into the holding member. In this case, it is preferable that the holding member has a rectangular cross section, and the positive and negative electrode conductive members are led out to the end surfaces of the two opposite sides of the holding member. At this time, you may make it form an air supply duct and an exhaust duct in the edge part along the other two sides which the holding member which crosses two sides of a holding member opposes. At this time, if the positive and negative electrode conductive members, the air supply duct, and the exhaust duct are provided symmetrically with respect to the central axis intersecting the plane of the case, the positions of the positive and negative electrode conductive members are alternately opposite to each other. The storage devices adjacent to each other can be easily connected in series using a metal plate, and the supply ducts and the exhaust ducts of each storage device can be communicated with each other. The positive and negative electrode conductive members are respectively joined to the positive and negative electrodes of the electrode group on the side opposite to the end face of the holding member, and an insulating seal material is disposed around the joint portion, and the insulating seal material is the positive and negative electrode conductive member And it is preferable that it is inserted in the holding member by insert molding. Further, the holding member desirably has a plurality of rib-shaped protrusions on one side of the case for rectifying the cooling air flowing between the air supply duct and the exhaust duct.

  Moreover, in this aspect, the safety valve for releasing the internal pressure of the case is formed by thinning a part of the case, and the gas released by the release of the internal pressure is discharged to a location adjacent to the safety valve of the holding member. A gas discharge duct may be further formed. At this time, the positive and negative electrodes of the electrode group are led out to the end face of the holding member through positive and negative electrode conductive members inserted into the holding member, respectively, and the positive and negative electrode conductive members, the air supply duct and the exhaust duct, the safety valve and the gas The discharge duct is preferably provided symmetrically with respect to the central axis intersecting the plane of the case.

  In order to solve the above problem, a second aspect of the present invention is a power storage module in which a plurality of power storage devices according to the first aspect are stacked. The power storage module of the second aspect also has the same effects as the power storage device of the first aspect.

  In the second aspect, through holes are formed in the holding member, and a rod-shaped member is passed through each through hole, so that positioning and fixing of the plurality of power storage devices are facilitated. Each power storage device is led out to the end surface of the holding member through the positive and negative electrode conductive members inserted into the holding member, and the positive and negative electrode conductive members, the air supply duct and the exhaust duct are It is preferably provided symmetrically with respect to the central axis intersecting the plane, and the plurality of power storage devices are arranged and stacked such that the positive and negative electrode conductive members are opposite to each other between adjacent power storage devices. . At this time, each power storage device is provided with a safety valve for releasing the internal pressure of the case formed by thinning a part of the case, and gas released by the release of the internal pressure at a location adjacent to the safety valve of the holding member. A gas discharge duct for discharging is further formed, and the positive and negative electrode conductive members, the air supply duct and the exhaust duct, and the safety valve and the gas discharge duct are provided symmetrically with respect to the central axis intersecting the plane of the case. It is desirable that Further, a metal plate for connecting the positive and negative electrode conductive members of adjacent power storage devices, a voltage detection line connected in advance to the metal plate, and a cell controller connected in advance to the voltage detection line and controlling the power storage device. If the control board is further provided, the electrical connection work is facilitated.

  And in order to solve the said subject, the 3rd aspect of this invention is a motor vehicle provided with the electrical storage module of the 2nd aspect. The power storage module of the third aspect also has the same effects as the power storage module of the second aspect.

  According to the present invention, since the case and the resin holding member are integrally formed by insert molding, the strength of the case is improved by the holding member, and an air supply duct and an exhaust duct are provided around the holding member. Since the members for forming these ducts are not required separately from the components constituting the electricity storage device, the number of components can be reduced and the assemblability can be improved. be able to.

1 is a side view of a hybrid electric vehicle according to an embodiment to which the present invention is applicable. It is a block wiring diagram of the hybrid electric vehicle of the embodiment. It is a disassembled perspective view of the battery module which comprises the module assembly of a hybrid electric vehicle. The cell unit which comprises a battery module is shown, (A) is a top view, (B) is a sectional side view, (C) is a front sectional view. The battery can of a cell unit is shown, (A) is a bottom view, (B) is a side view. The holder of a cell unit is shown, (A) is a top view, (B) is a side view. The relationship between a battery can and a holder is shown, (A) is a plan view, (B) is a sectional view taken along line BB in (A), and (C) is a sectional view taken along line CC in (A). The relationship between a battery can and a holder is shown, (A) is a plan view, and (B) is a cross-sectional view taken along line BB of (A). The relationship between a battery can and a holder is shown, (A) is a plan view, (B) is a sectional view taken along line BB in (A), and (C) is a sectional view taken along line CC in (A). One end plate which comprises a battery module is shown, (A) is a top view, (B) is a side sectional view, (C) is a front sectional view. The other end plate which comprises a battery module is shown, (A) is a top view, (B) is a sectional side view, (C) is a front sectional view. It is a side view of a battery module. It is action | operation explanatory drawing of the air supply duct and exhaust duct of a battery module. It is operation | movement explanatory drawing of the gas discharge duct of a battery module.

  Hereinafter, an embodiment in which the present invention is applied to a hybrid electric vehicle will be described with reference to the drawings.

<Configuration>
(Automobile)
As shown in FIG. 1, a hybrid electric vehicle (hereinafter simply referred to as an automobile) 300 according to the present embodiment includes, for example, a power supply module that serves as a power source when the automobile 300 is driven by a motor under the rear seat. 200 is installed.

(Power module)
As shown in FIG. 2, the power supply module 200 includes a module assembly 150 having a plurality of battery modules 100 (two are schematically shown in FIG. 2 but may be more than that), and a module assembly. And a power supply module controller 180 for controlling 150.

  The module assembly 150 is mainly arranged between the blower fan 110 for supplying cooling air for cooling the individual cells (cell units) constituting the battery module 100, the battery modules 100 connected in series, and the battery modules 100 for repair. A service disconnect switch SD / SW for disconnecting the connection at the time of inspection and a current sensor S for measuring a current flowing through the battery module 100 are configured. Note that, in FIG. 2, the heavy electrical wiring is indicated by a bold line in order to distinguish the strong electrical system (power supply circuit) from the weak electrical system (signal processing circuit).

  The power supply module controller 180 includes an MPU that performs various processing operations, a nonvolatile EEPROM, an A / D converter, a D / A converter, a total voltage measurement circuit that measures the total voltage of the battery module 100 constituting the module assembly 150, and communication. IC and an interface.

  The power supply module controller 180 is connected to the output line of the current sensor S, and can capture the current flowing through the battery module 100 via the A / D converter as a digital value. The power supply module controller 180 is connected to the positive electrode and the negative electrode of the module assembly 150, and can capture the total voltage of the module assembly 150 as a digital value via the above-described total voltage measurement circuit and A / D converter. . Furthermore, the power supply module controller 180 detects the voltage of each single battery (cell unit 20, see FIG. 3) constituting the battery module 100, and also adjusts the battery voltage of each single battery to be constant. Is abbreviated as celcon (see also FIG. 12). Moreover, the cell controller 64 is a predetermined part of a specific unit cell among the unit cells constituting the power supply module 100 (for example, a part on the surface of the holder 25 between the exhaust ducts 19 described later, see also FIGS. 3 and 4). Further, the temperature from a temperature sensor (not shown) fixed to is also detected, and the power supply module controller 180 also acquires temperature information of each power supply module 100. Further, the power supply module controller 180 is connected to the blower fan 110 and controls on / off of the blower fan 110 according to information from the current sensor S and the cell controller 64.

  The positive electrode and the negative electrode of the module assembly 150 are connected to the inverter controller 320 via the relay RL. The inverter controller 320 mainly includes an MCU and a power module PM that performs conversion between direct current and alternating current. The power module PM is connected to a motor M that runs the automobile 300 and operates with a three-phase AC. The MCU controls ON / OFF of the relay RL in accordance with a command from the host controller 310 on the vehicle side, converts the DC power from the module assembly 150 into a three-phase AC power by the power module PM, and drives the motor M. For example, when braking is applied while the engine is running, the motor M is operated as a generator and the generated electricity is converted from a three-phase AC power source to a DC power source by the power module PM and regenerated in the module assembly 150 (battery module 100 To charge.)

  The power supply module controller 180 is connected to the host controller 310, and the host controller 310 is connected to the voltage information of the individual cells constituting the battery module 100, the temperature information of the battery module 100, the current information flowing through the battery module 100, and the module assembly. 150 total voltage information is notified every predetermined time. Therefore, for example, when the host controller 310 detects an abnormality of one unit cell in the module assembly 150, the host controller 310 instructs the inverter controller 320 to reduce the output or when the battery module 100 of the module assembly 150 is in a fully charged state. In addition, the regenerative power supply to the module assembly 150 can be stopped, and they can be displayed on the installation panel of the automobile 300 to alert the driver if necessary. In the present embodiment, the power supply module controller 180, the inverter controller 320, and the host controller 310 operate with power supplied from a power source (14V lead acid battery) different from the module assembly 150. You may make it supply the electric power which divided the voltage.

(Outline of battery module)
As shown in FIG. 3, in short, the battery module 100 is formed by stacking a plurality (10 in FIG. 3) of cell units (single cells) 20 and arranging end plates 30 and 40 on both sides thereof. These are fixed with the bolts 50, and the bus bar 61 (see FIG. 12) of the control board 60 arranged on the side is screwed to the positive terminal 12 and the negative terminal 13 led to both ends of the cell unit 20. However, the details are as follows.

(Cell unit)
As shown in FIGS. 4A to 4C, the cell unit 20 includes a metal battery case 10 (made of aluminum in this example) and a resin holder 25 that holds the battery case 10. ing. In the present embodiment, a lithium ion secondary battery is illustrated as the cell unit 20.

  As shown in FIGS. 4B and 4C, the battery case 10 is made of an aluminum, shallow box-shaped battery can 11, and an aluminum, flat battery cover 21 that seals the opening of the battery can 11. It consists of As shown in FIGS. 5A and 5B, a rectangular opening 11 b is formed in the left and right center portions of the planar bottom surface of the battery can 11, and the opening 11 b is formed on the left and right side surfaces of the battery can 11. Are formed by thinning (weakening) the side surface of the battery can 11 at two locations so as to sandwich the inner pressure of the battery case 10 when the pressure becomes equal to or higher than a preset pressure (set pressure). A circular safety valve 11a for releasing the valve is disposed. The opening 11b and the safety valve 11a are formed symmetrically with respect to the (virtual) central axis (center of the bottom surface of the battery can 11) that intersects the battery case 10.

  As shown in FIGS. 6A and 6B, the holder 25 is configured to cover the battery cover 11 (five surfaces excluding the battery cover 21 of the battery case 10) at the center, and is generally a box as a whole. Shape (rectangular section). As shown in FIG. 6A, various ducts are formed in the holder 25 around the battery cover 11. That is, on the lower side of FIG. 6 (A), an air supply duct 17 for supplying cooling air for cooling the battery case 10 with two rectangular sections is provided, and provided on both the left and right sides for weight reduction. 6 are formed on the upper side of FIG. 6 (A), and an exhaust duct 19 for discharging the cooling air heated by heat exchange with the battery case 10 having two rectangular sections. And two cutout holes are formed on the left and right sides thereof. The shapes of the air supply duct 17 and the exhaust duct 19 are the same. Further, the holder 25 is reinforced at the bottom surface side of the battery can 11 and between the air supply duct 17, the exhaust duct 19, and the cutout hole, and the cooling air flowing between the air supply duct 17 and the exhaust duct 19 is rectified. A rectifying duct 18 is formed. The rectifying duct 18 is constituted by a plurality of elongated rib-like projections (in this example, five), and the cooling air flows between the rectifying ducts 18 from the supply duct 17 side to the exhaust duct 19 side (FIG. 8). (See also (A) and (B)). Further, on the right side and the left side of FIG. 6 (A), there are two portions adjacent to the safety valve 11a shown in FIGS. 5 (A) and 5 (B) (see also FIGS. 9 (A) to (C)). A gas discharge duct 16 having a vertically long rectangular cross section is formed. These gas discharge ducts 16 have the same shape.

  As shown in FIGS. 7A to 7C, the battery can 11 is inserted into the holder 25 with the outer bottom surface as the upper side, and both are integrally formed. In addition, cylindrical brass bushes 15a are inserted at the four corners of the holder 25 to constitute the unit connecting portion 15 when the cell units 20 are used in a stacked manner (see FIG. 3). Furthermore, in the center part of the right side and the left side of FIG. 7A, a plate-like positive electrode conductive material 12 made of aluminum and a plate-like negative electrode conductive member 13 made of copper are respectively sandwiched between the gas discharge ducts 16. Inserted.

  A positive electrode joint 12a is formed at one end of the positive electrode conductive member 12 so as to protrude toward the battery can 11 and is recessed in a substantially rectangular shape. The positive electrode joint 12a is surrounded by an insulating seal made of EPDM. It is surrounded by the material 14 and is press-fitted into the opening 11 b of the battery can 11. The insulating sealing material 14 functions to electrically insulate the battery can 11 and the positive electrode conductive member 12 (positive electrode joint portion 12a) and prevent (seal) leakage of the nonaqueous electrolyte contained in the battery case 10. It is insert-molded in the holder 25 together with the positive electrode conductive member 12. On the other hand, the other end portion of the positive electrode conductive member 12 is bent in a substantially L-shaped cross section along the side surface of the holder 25, and the bent (side) end surface constitutes the positive electrode terminal 12 b of the cell unit 20. . A round hole is formed in the center of the positive electrode terminal 12b. The nut 27 is inserted into the holder 25 so as to come into contact with the positive electrode terminal 12b at the place where the round hole is formed, and the end surface of the nut 27 and the end surface of the positive electrode terminal 12b are set to be the same surface. (See also FIG. 6B).

  Similarly to the positive electrode conductive member 12, the negative electrode conductive member 13 is also inserted into the holder 25. That is, the negative electrode conductive member 13 is formed with a negative electrode joint portion 13a that protrudes toward the battery can 11 side and is recessed in a substantially rectangular shape, and the negative electrode joint portion 13a is made of EPDM. It is surrounded by the insulating sealing material 14 and is press-fitted into the opening 11 b of the battery can 11. The insulating sealing material 14 functions to electrically insulate the battery can 11 and the negative electrode conductive member 13 (negative electrode joint portion 13a) and prevent (seal) leakage of the nonaqueous electrolyte contained in the battery case 10. It is insert-molded in the holder 25 together with the negative electrode conductive member 13. On the other hand, the other end portion of the negative electrode conductive member 13 is bent in a substantially L-shaped cross section along the side surface of the holder 25, and this bent (side) end surface constitutes the negative electrode terminal 13 b of the cell unit 20. . A round hole is formed in the center of the negative electrode terminal 13b. The nut 28 is inserted into the holder 25 so as to come into contact with the negative electrode terminal 13b at the place where the round hole is formed, and the end surface of the nut 28 and the end surface of the negative electrode terminal 13b are set to be the same surface. Yes.

  Here, as shown in FIG. 7A, the points to be noted are the above-described safety valve 11a and positive electrode conductive member 12 (positive electrode) with respect to the center of the holder 25 (the central axis intersecting the bottom surface of the battery can 11). The terminal 12b), the negative electrode conductive member 13 (negative electrode terminal 13b), the gas exhaust duct 16, the air supply duct 17, the rectifying duct 18, the exhaust duct 19, and the unit coupling portion 15 are all arranged symmetrically. The reason for this is that, as shown in FIG. 3, when a plurality of cell units 20 are connected in series, the positive electrode terminals 12b and the negative electrode terminals 13b of the adjacent cell units 20 are alternately arranged (disposed on opposite sides). This is to ensure series connection of the cell units 20 constituting the battery module 100 and to communicate each duct between the adjacent cell units 20.

  As shown in FIGS. 4A to 4C, in the battery case 10, a flat wound body 22 in which positive and negative electrodes are wound through a separator, and a nonaqueous electrolytic solution infiltrating the wound body 22. (Not shown) are accommodated.

  The winding body 22 winds two separators around the flat shaft core of the winding device several times, then starts winding in order of the negative electrode and the positive electrode, and sets the positive and negative electrodes to a predetermined length. In order to increase the volumetric power density by removing the wound body from the flat shaft core of the winding device by further winding two separators on the outer periphery several times around the outer periphery, and removing the wound body from the flat shaft core of the winding device. It is configured to be further crushed by applying a predetermined surface pressure to the rotating body. In order to reduce the weight of the entire cell unit 20, the wound body 22 has a coreless structure, and the winding start end and end end are fixed with an adhesive tape to prevent unwinding.

  The positive electrode constituting the wound body 22 is obtained by, for example, applying a positive electrode active material mixture except for one side along the longitudinal direction of both surfaces of an aluminum foil (positive electrode current collector) having a thickness of 20 μm. As the positive electrode active material mixture, for example, a mixture of lithium transition metal double oxide such as lithium manganate as a positive electrode active material, carbon powder as a conductive material, and a binder in a predetermined ratio can be used. . In the present embodiment, the positive electrode active material mixed in this way is added to a dispersion solvent and kneaded to prepare a positive electrode slurry, and after applying the positive electrode slurry to the aluminum foil substantially uniformly and uniformly at a predetermined thickness, It was formed by drying and pressing to a predetermined bulk density. Although the positive electrode active material mixture uncoated portion of the aluminum foil is used as a positive electrode lead piece, the uncoated portion may be cut out, for example, in a rectangular shape.

  On the other hand, the negative electrode that constitutes the wound body 22 is, for example, one in which a negative electrode active material mixture is applied except for one side along the longitudinal direction of both surfaces of a rolled copper foil (negative electrode current collector) having a thickness of 10 μm. is there. As the negative electrode active material mixture, for example, a mixture of amorphous carbon capable of inserting and extracting lithium ions and a binder in a predetermined ratio can be used as the negative electrode active material. In this embodiment, the negative electrode active material thus mixed is added to a dispersion solvent and kneaded to prepare a negative electrode slurry, and the negative electrode slurry is applied to the rolled copper foil substantially uniformly and uniformly at a predetermined thickness. It was formed by drying and pressing to a predetermined bulk density. Similar to the positive electrode, the negative electrode active material mixture uncoated portion of the rolled copper foil is used as a negative electrode lead piece. However, this uncoated portion may be cut out, for example, in a rectangular shape.

  For the separator constituting the wound body 22, for example, microporous polyethylene having a thickness of 25 μm can be used. Note that the positive electrode lead piece and the negative electrode lead piece described above are led out from the end surfaces on the opposite sides of the wound body 22 (see FIG. 4C). The positive electrode lead pieces are collected by ultrasonic welding to the upper and lower two thin aluminum current collector plates 23. Similarly, the negative electrode lead pieces are ultrasonically welded to the upper and lower two thin copper current collector plates 24. It is gathered by doing.

  The current collector plate 23 disposed on the upper side of the positive electrode lead piece is bonded to the bottom surface of the hollow of the positive electrode bonding portion 12 by welding. On the other hand, on the negative electrode side, the current collector plate 24 arranged on the upper side of the negative electrode lead piece is joined by welding to the hollow bottom surface of the negative electrode joint portion 13a. As described above, the insulating sealing material 14 disposed by insert molding on the holder 25 is interposed around the positive electrode joint portion 12a and the negative electrode joint portion 13a. Therefore, the wound body 22 has a structure that is supported by the battery can 11 via the insulating sealing material 14, and the positive and negative electrodes of the cell unit 20 are respectively connected to the holder 25 via the positive electrode conductive member 12 and the negative electrode conductive member 13. The battery can 11 is integrally connected to the positive electrode terminal 12b and the negative electrode terminal 13b arranged on the side surface, and the battery can 11 has a structure that does not take any polarity of the positive and negative electrodes.

The non-aqueous electrolyte described above includes, for example, a lithium salt such as lithium hexafluorophosphate (LiPF ₆ ) in a mixed solvent in which ethylene carbonate, dimethyl carbonate, and diethyl carbonate are mixed at a ratio of 1: 1: 1. What melt | dissolved in the ratio of 1 mol / L can be used.

  After winding the current collector plate 23 and the positive electrode joint portion 12a and welding the current collector plate 24 and the negative electrode joint portion 13a, the wound body 22 is injected with a predetermined amount of nonaqueous electrolyte in a state where the top and bottom are reversed. Is done. And the periphery of the battery cover 21 is welded to the opening peripheral part of the battery can 11, and the inside of the battery case 10 is sealed. In this example, since a volatile solvent is used for the non-aqueous electrolyte, such welding is performed in a low temperature environment.

(Details of battery module)
As described above, the end plates 30 and 40 are disposed at both ends of the battery module 100 (see FIG. 3).

  As shown in FIGS. 10A to 10C, the end plate 30 includes a wall surface 33 that covers the two air supply ducts 17 and the two exhaust ducts 19 of the cell unit 20 adjacent on the upper and lower sides, the cell unit 20, Similarly, it has a unit coupling part 34 in which a brass bush made of brass is inserted at four corners. The end plate 30 is formed with a circular cavity 32 at the center that functions as a connecting portion of a discharge pipe (not shown) for discharging the gas released from the cell unit 20 to the outside of the automobile 300. On both sides, cavities 31 communicating with the gas discharge duct portion 16 of the cell unit 20 are formed (see also FIG. 14). Although omitted in FIG. 10, nuts are inserted on the side surfaces of the end plate 30 (see the board mounting portion 35 in FIG. 12).

  As shown in FIGS. 11A to 11C, the end plate 40 has wall surfaces 43 that close the four gas discharge ducts 16 of the adjacent cell units 20 on both side surfaces, and four corners similarly to the cell unit 20. It has a unit coupling portion 44 in which a cylindrical bush made of brass is inserted. Further, the end plate 40 is formed with a rectangular cavity 41 communicating with the two air supply ducts 17 of the cell unit 20 on the lower side and communicating with the two exhaust ducts 19 of the cell unit 20 on the upper side. A rectangular cavity 42 is formed (see also FIG. 13). Although omitted in FIG. 11, nuts are inserted on the side surfaces of the end plate 40 (see the board mounting portion 45 in FIG. 12).

  As shown in FIG. 3, the end plate 30 is disposed outside the automobile 300, and the cell unit 20 includes the above-described positive electrode terminal 12 b and negative electrode terminal 13 b that are alternately stacked in adjacent cell units 20. An end plate 40 is disposed inside the vehicle. In order to facilitate positioning by laminating these, four bolts 50 are passed through the unit coupling portions 34, 15, 44 arranged at the four corners of the end plate 30, the cell unit 20, and the end plate 40, respectively. The end plate 40 is screwed with a nut (not shown) on the end side. Cooling air is supplied to the cavity 41 (see FIG. 11A) formed on the lower side of the end plate 40 from the blower fan 110 (see FIG. 2) described above.

  As shown in FIG. 12, a rectangular control board 60 is fixed to the center of both side surfaces of the battery module 100. That is, the control board 60 is screwed to the board mounting portions 35 and 45 including two nuts inserted on the side surfaces of the end plates 30 and 40 with four screws per side surface.

  A voltage detection line 62 is wired in advance on the control board 60, and a cell controller 64 and a connector 65 are mounted. The voltage detection line 62 is connected in advance to the cell controller 64, and a bus bar 61 for connecting the positive electrode terminal 12b and the negative electrode terminal 13b of the adjacent cell unit 20 is connected to each voltage detection line 62 in advance. ing. In the example shown in FIG. 12, two voltage detection lines 61 are connected for each bus bar 61, but theoretically, one may be used for each bus bar 61. In this embodiment, the power supply for automobiles is used. In order to ensure the certainty, the two voltage detection lines 61 are connected to the bus bar 61 in advance. The cell controller 64 and the connector 65 are connected in advance.

  The positive electrode terminal 12b and the negative electrode terminal 13b of the adjacent cell unit 20 are connected by a flat bus bar 61 made of, for example, copper and formed with a round hole. That is, it is connected to the nuts 27 and 28 (see FIG. 7) inserted in the holder 25 by screwing with two screws through the bus bar 61 (round hole).

  As is well known, for example, an A / D converter, a reference voltage generation circuit that generates a reference voltage for measuring a battery voltage, a multiplexer for sequentially specifying voltage measurement locations, a differential amplifier circuit, and a logic are known. A circuit and a capacitance adjusting resistor for keeping the cell balance (capacity and voltage) between the cell units 20 constant and a switch that can be turned on / off by a command from the logic circuit are provided in parallel with each cell unit 20. It consists of a cell balance circuit connected to. In the present embodiment, since the cell controller 64 is divided and disposed on both sides of the battery module 100, the voltage of each cell unit 20 cannot be calculated by one cell controller 64, and thus the cells are connected in series. The voltage of the two cell units 20 is detected (monitored) and notified to the power supply module controller 180 (see FIG. 2). The voltage and capacity adjustment time of each cell unit 20 are calculated on the power supply module controller 180 side, and the cell controller 62 To be notified. In accordance with the notified capacity adjustment time, the cell controller 64 adjusts the cell balance to be constant by turning on a predetermined switch so that the battery capacity of each cell unit 20 is substantially uniform when the battery module 100 is charged and discharged. To do. Further, as described above, the cell unit 62 also notifies the power supply module controller 180 of temperature information from the temperature sensor, thereby adjusting the capacity of each cell unit 20 that has been subjected to temperature correction by the cell controller 64 (uniform voltage balance). ) Is performed.

  The connector 65 is a female connector, and is connected to the power supply module controller 180 by a cable having a plurality of male connectors as shown in FIG. In the module assembly 150, a plurality of battery modules 100 are connected via a service disconnect switch SD / SW.

<Assembly procedure of battery module>
Next, the assembly procedure of the battery module 100 of this embodiment is demonstrated.

  As shown in FIG. 3, after the end plate 30 is disposed (penetrated) using the four bolts 50 as positioning members, the cell unit 20 is alternately placed on the opposite side with the positive terminal 12b and the negative terminal 13b. Laminate as follows. At that time, a fitting structure is formed so that the positive electrode terminals 12b and the negative electrode terminals 13b are alternately arranged, and the battery module 100 is not assembled when they are not arranged alternately. You may make it leave. Then, the end plate 40 is disposed (through the bolt 50), and the bolt 50 is screwed with a nut (not shown). Thereby, the cell units 20 constituting the battery module 100 are stacked, the air supply duct 17 and the exhaust duct 19 communicate with each other, and the rectifying duct 18 is positioned between the cell units 20 (see FIG. 13). The gas discharge duct 16 of the cell unit 20 is also communicated (see FIG. 14).

  Next, as shown in FIG. 12, the control board 60 is attached to the board attaching portions 35 and 45 of the end plates 30 and 40 with screws, and then the screws 27 are inserted into the nuts 27 and 28 inserted into the holder 25 via the bus bar 61. Conclude. Thereby, the connection between the positive electrode terminal 12b and the negative electrode terminal 13b of the adjacent cell unit 20 is completed. This operation is repeated for the number of bus bars 61. And the assembly of the battery module 100 is completed by performing the above operation | work also about the other side of the battery module 100. FIG. Thereby, the battery module 100 becomes a connection structure in which the cell units 20 are connected in series.

<Operation of battery module>
Next, the cooling operation of the battery module 100 during normal time and the gas discharging operation when the battery is abnormal will be described.

(Normal cooling operation)
As shown in FIG. 13, the cooling air supplied from the blower fan 110 (see FIG. 2) is supplied to the air supply duct 17 of each cell unit 20 through the cavity 41 formed in the end plate 40, and the rectifying guide. 18, the air is collected in the exhaust duct 19, and exhausted through the cavity 42 formed in the end plate 40 (to the inside of the vehicle). On the other hand, the air supply duct 17 and the exhaust duct 19 are closed by the wall surface 33 of the end plate 30 on the opposite side of the battery module 100.

  At this time, as shown in FIG. 8B, the cooling air supplied to the air supply duct 17 of each cell unit 20 passes between the rib-shaped rectification ducts 18 along the rectification duct 18 from the supply air duct 17 side. Each cell unit exchanges heat by contacting the battery case 10 (outer bottom surface of the battery can 11) of each cell unit 20 that flows in the vertical direction (rectified) to the exhaust duct 19 side and is heated by charge / discharge operation. The temperature of each cell unit 20 can be suppressed by taking the heat of 20 and the temperature between the cell units 20 can be kept constant.

(Gas discharge operation when battery is abnormal)
When the battery is abnormal (as described above, for example, at the time of overcharge or when a foreign object is pierced or collapsed during a traffic accident), the cell unit 20 becomes hot and the nonaqueous electrolyte decomposes, The internal pressure of the case 10 increases. When the internal pressure becomes equal to or higher than the set value described above, the safety valve 11a is cleaved, and the gas released from the battery case 10 is formed in the holder 25 adjacent to the safety valve 11a as shown by the arrow in FIG. The gas is discharged to the gas discharge duct 16.

  At this time, as shown in FIG. 14, the discharged gas is discharged out of the vehicle from the cavity 31 and the cavity 32 formed in the end plate 30 through the gas discharge duct 16. On the other hand, since the opposite side of the battery module 100 is blocked by the wall surface 43 formed on the end plate 40, gas does not leak into the vehicle.

<Action etc.>
Next, the operational effects of the automobile 300 according to the present embodiment will be described focusing on the operational effects of the cell unit 20 and the battery module 100.

(Cell unit)
In the present embodiment, the metal battery case 10 (battery can 11) and the resin holder 25 are integrally formed by insert molding, and cooling air for cooling the battery case 10 is formed around the holder 25. An air supply duct 17 for supplying air and an exhaust duct 19 for discharging cooling air heated by heat exchange with the battery case 10 (outer bottom surface of the battery can 11) are formed (FIG. 4). . According to this embodiment, since the battery case 10 and the holder 25 are integrally formed, the strength of the battery case 10 is improved by the holder 25, and the air supply duct 17 and the exhaust duct 19 are integrated with the holder 25. Since it is formed, a member for configuring these ducts separately from the components configuring the cell unit 20 as shown in Patent Document 2 is not required, so the number of components is reduced and the assemblability is improved. Can be made.

  In the present embodiment, the positive and negative electrodes of the wound body 22 are led out to the side end surface of the holder 25 through the positive electrode conductive member 12 and the negative electrode conductive member 13 inserted in the holder 25, respectively (FIG. 4). The battery case 10 is inserted so as to be covered with the holder 25 in order to improve the strength. However, since the positive electrode conductive member 12 and the negative electrode conductive member 13 are inserted, the positive and negative electrodes are inserted into the holder 25 after the cell unit 20 is assembled. Wiring work leading to the end face is not necessary. Moreover, by arranging in this way, connection between the cell units 20 is facilitated.

  Further, in the present embodiment, the holder 25 has a rectangular cross section, and the positive electrode conductive member 12 and the negative electrode conductive member 13 are led out to the opposite end surfaces of the holder 25 (FIG. 4). For this reason, it becomes a structure which is easy to prevent the short circuit of the positive electrode terminal 12b formed in the positive electrode conductive member 12 and the other side edge part, the negative electrode conductive member 13, and the negative electrode terminal 13b formed in the other side edge part.

  In the present embodiment, the air supply duct 17 and the exhaust duct 19 are formed at the end portions along the other two sides intersecting the two opposite sides of the holder 25 described above (FIG. 4). For this reason, size reduction of the whole cell unit 25 can be achieved.

  Furthermore, in the present embodiment, the positive electrode conductive member 12, the negative electrode conductive member 13, the air supply duct 17, and the exhaust duct 19 are provided symmetrically with respect to the central axis that intersects the plane of the battery case 10. 17 and the exhaust duct 19 have the same shape (FIG. 4). For this reason, in order to connect the adjacent cell units 20 in series, one cell unit 20 among the adjacent cell units 20 can be arranged and stacked so as to rotate 180 ° around the central axis.

  In the present embodiment, the positive electrode conductive member 12 and the negative electrode conductive member 13 are formed with the positive electrode joint portion 12a on the side opposite to the end face side (the positive electrode terminal 12b side) of the holder 25. Joined to the positive and negative electrodes of the rotating body 22, an insulating sealing material 14 is disposed around the joint, and the insulating sealing material 14 is inserted into the holder 25 by insert molding together with the positive electrode conductive member 12 and the negative electrode conductive member 13. (FIG. 4). For this reason, each connection with the positive electrode conductive member 12, the negative electrode conductive member 13, and the positive / negative electrode of the winding body 22 can be performed easily. Further, since the positive electrode joint portion 12a and the negative electrode conductive member 13 have a shape that protrudes toward the battery can 11 and is recessed in a substantially rectangular shape, it is easy to insert a welding jig.

  Furthermore, in this embodiment, the battery case 10 (battery can 11) is provided with a safety valve 11a that is formed by thinning a part of the battery case 10 to release the internal pressure of the battery case 10, and is adjacent to the safety valve 11a of the holder 25. A gas discharge duct 16 for discharging gas released by releasing the internal pressure of the battery case 10 is formed at a location (FIG. 9). For this reason, the gas released when the battery is abnormal can be safely discharged (outside the vehicle) through the gas discharge duct 16 (FIG. 14).

  Furthermore, in this embodiment, the positive and negative electrodes of the wound body 22 are led out to the end face of the holder 25 through the positive electrode conductive member 12 and the negative electrode conductive member 13 inserted in the holder 25, respectively. The negative electrode conductive member 13, the air supply duct 17 and the exhaust duct 19, the safety valve 11 a and the gas discharge duct 16 are provided symmetrically with respect to the central axis intersecting the plane of the battery case 10, and four gas discharges are performed. The duct 16 has the same shape (FIG. 3). For this reason, in order to connect adjacent cell units 20 in series, one cell unit 20 of adjacent cell units 20 is arranged so as to be rotated by 180 ° around the central axis and stacked. The positive electrode terminal 12b and the negative electrode terminal 13b of the cell units 20 to be connected are arranged on the same horizontal plane, so that the connection with the bus bar 61 is facilitated (FIG. 12). Each of the positions is switched in the vertical direction, functions as an exhaust duct and an air supply duct, respectively, and can adopt a structure in which the air supply duct and the exhaust duct communicate with each other between adjacent cell units 20 (FIG. 13). Further, a structure in which the gas discharge ducts 16 communicate with each other can be adopted (FIG. 14).

  In the present embodiment, the holder 25 includes a plurality of holders for rectifying the cooling air flowing between the air supply duct 17 and the exhaust duct 19 on one surface side of the battery case 10 (the outer bottom surface side of the battery can 11). Rectifying duct 18 (rib-like projection) (FIG. 4). For this reason, the cooling air supplied to the air supply duct 17 of the cell unit 20 flows between the rib-like rectification ducts 18 along the rectification duct 18 from the supply air duct 17 side to the exhaust duct 19 side in a substantially vertical direction. By contacting and exchanging heat with the battery case 10 of the cell unit 20 that has been heated by the charge / discharge operation, the cell unit 20 is deprived of heat and the temperature of the cell unit 20 is suppressed, and the temperature between the cell units 20 is kept constant. It becomes possible to keep. By maintaining the cell unit 20 constituting the battery module 100 at a constant temperature in this way, a load is applied to the specific cell unit 20 and the cell unit 20 is deteriorated. It is possible to prevent a reduction in design life.

(Battery module)
In the present embodiment, since the battery module 100 is configured by stacking a plurality of cell units 20 having the above advantages (FIG. 3), the number of parts is reduced and the assemblability is improved (assembly time), as will be described in detail below. Shortening).

  First, the holder 25 and the end plates 30 and 40 have unit coupling portions 15 (FIG. 4), 34 (FIG. 10), and 44 (FIG. 11) in which through holes are respectively formed at four corners. The plurality of cell units 20 and the end plates 30 and 40 are fixed by passing the bolts 50 therethrough (FIG. 3). For this reason, it becomes easy to position and fix the cell unit 20 and the end plates 30 and 40 during assembly.

  Each of the cell units 20 is led to the end surface of the holder 25 through the positive electrode conductive member 12 and the negative electrode conductive member 13 in which the positive and negative electrodes of the wound body 22 are inserted in the holder 25, respectively. The conductive member 13, the air supply duct 17, and the exhaust duct 19 are provided symmetrically with respect to the central axis that intersects the plane of the battery case 10 (battery can 11), and the cell units 20 constituting the battery module 100 are adjacent to each other. The positive electrode conductive member 12 and the negative electrode conductive member 13 are arranged and stacked so that the cell units 20 are opposite to each other. For this reason, in order to connect adjacent cell units 20 in series, one cell unit 20 of adjacent cell units 20 is arranged so as to be rotated by 180 ° around the central axis and stacked. The positive electrode terminal 12b and the negative electrode terminal 13b of the cell units 20 to be connected are arranged on the same horizontal plane, so that the connection with the bus bar 61 is facilitated (FIG. 12). Each of the positions is switched in the vertical direction, and functions as an exhaust duct and an air supply duct, respectively, and a structure in which the air supply duct and the exhaust duct communicate with each other between adjacent cell units 20 can be adopted (FIG. 13).

  Furthermore, each of the cell units 20 includes a safety valve 11a that is formed by thinning a part of the battery case 10 (battery can 11) to release the internal pressure of the battery case 10, and is adjacent to the safety valve 11a of the holder 25. A gas discharge duct 16 for discharging a gas released by releasing the internal pressure is further formed at a place where the discharge is performed, and the positive electrode conductive member 12, the negative electrode conductive member 13, the air supply duct 17, the exhaust duct 19, and the safety valve 11a and the gas discharge duct 16 are provided symmetrically with respect to the central axis intersecting the plane of the battery case 10 (battery can 11). Therefore, as described above, in order to connect the adjacent cell units 20 in series, one of the adjacent cell units 20 is arranged so as to be rotated by 180 ° around the central axis. When the positive electrode terminal 12b and the negative electrode terminal 13b of the adjacent cell units 20 are arranged on the same horizontal plane, the connection with the bus bar 61 becomes easy (FIG. 12), and the air supply duct of the one cell unit 20 17, the positions of the exhaust duct 19 are interchanged in the vertical direction, function as an exhaust duct and an air supply duct, respectively, and a structure in which the air supply duct and the exhaust duct communicate with each other between adjacent cell units 20 can be adopted. In addition, a structure in which the gas discharge ducts 16 communicate with each other can be adopted (FIG. 14).

  Furthermore, the bus bar 61 for connecting the positive electrode conductive member 12 and the negative electrode conductive member 13 of the adjacent cell unit 20, the voltage detection line 62 connected in advance to the bus bar 61, and the voltage detection line 62 connected in advance. Since the control board 60 having the cell controller 64 for controlling the cell unit 20 and the connection 65 is simply screwed to the side surface of the battery module 100, the fixing and wiring work is completed (FIG. 12). Assemblability can be improved.

(Automobile)
The automobile 300 according to this embodiment includes a power supply module 200 including a module assembly 150 having a plurality of battery modules 100 and a power supply module controller 180 (FIG. 2). For this reason, according to the automobile 300 of the present embodiment, the cell unit 20 constituting the battery module 100 is strong and hardly affected by vibration or the like because the battery case 10 is covered with the holder 25. In addition, since the above-described various ducts are formed integrally with the holder 25, the weight can be reduced and the cost can be reduced by reducing the number of parts.

  Further, in the automobile 300 of the present embodiment, the power supply module 200 is mounted on the lower side of the rear seat near the outside of the vehicle (FIG. 1). For this reason, according to the automobile 300 of the present embodiment, the gas discharged when the safety valve 11a of the cell unit 20 is cleaved is discharged from the cavity 31 and the cavity 32 formed in the end plate 30 via the gas discharge duct 16 to the outside of the vehicle. The opposite side of the battery module 100 is discharged and is closed by a wall surface 43 formed on the end plate 40 (FIG. 14). For this reason, gas does not leak into the vehicle, and when the battery module 100 is mounted on the vehicle, the safety of the passenger of the vehicle 300 can be ensured.

  In addition, in this embodiment, although the cell unit 20 of the lithium ion secondary battery was illustrated to the electrical storage device, this invention is not restrict | limited to this. For example, a secondary battery such as a nickel metal hydride battery may be used. Further, the electricity storage device is not limited to a secondary battery, and may be a capacitor or a combination of both.

  In the present embodiment, the battery case 10 is illustrated as having a shallow box shape (rectangular section), but the present invention is not limited to this. For example, a cylindrical shape or a known battery case may be used. Similarly, the shape of the holder 25 is not limited as long as the various ducts can communicate with each other.

  Furthermore, in the present embodiment, specific materials are exemplified for the positive electrode conductive member 12, the negative electrode conductive member 13, and the bus bar 61, but the present invention is not limited thereto, and various known materials can be used. it can. This point is the same also about the insulating sealing material 14 illustrated.

  In the present embodiment, the bolt 50 is exemplified as the rod-shaped member. However, the present invention is not limited to this, and any rod-shaped member that can position and fix the cell unit 20 or the like may be used.

  Furthermore, in the present embodiment, the battery module 100 in which the cell units 20 are connected in series is illustrated as the power storage module. However, the present invention is not limited thereto, and the power storage modules are configured by connecting the cell units 20 in parallel or in series and parallel. You may make it comprise. When adopting such a series-parallel connection structure, as described above, the secondary battery and the capacitor may be connected in parallel.

  Moreover, in this embodiment, although the hybrid electric vehicle was illustrated as a motor vehicle, this invention is not restricted to such an aspect, For example, both a pure electric vehicle (PEV), a fuel cell, and an electrical storage device are used as a drive source. The present invention can also be applied to a fuel cell hybrid vehicle (FCHV).

  In the present embodiment, the battery module 100 is mounted on a hybrid electric vehicle. However, the battery module 100 can be used as a stationary power storage module other than mounting on a moving body.

  The present invention provides a power storage device in which the number of components is reduced and the assemblability is improved without sacrificing performance and safety, a power storage module including the power storage device, and an automobile including the power storage module. Therefore, it contributes to the manufacture and sale of power storage devices, power storage modules and automobiles, and thus has industrial applicability.

10 Battery case (case)
DESCRIPTION OF SYMBOLS 11 Battery can 11a Safety valve 12 Positive electrode conductive member 12a Positive electrode joint part 12b Positive electrode terminal 13 Negative electrode conductive member 13a Negative electrode joint part 13b Negative electrode terminal 14 Insulation sealing material 16 Gas exhaust duct 17 Supply duct 18 Rectification duct (protrusion)
19 Exhaust duct 20 Cell unit (electric storage device)
22 Winding body (electrode group)
25 Holder (holding member)
50 bolts (rod-like members)
60 Control board 61 Bus bar (metal plate)
62 voltage detection line 64 cell controller 100 battery module (storage module)
300 Vibrid Electric Vehicle (Automobile)

Claims (15)

A case containing an electrode group in which positive and negative electrodes are arranged via a separator and an electrolyte solution infiltrating the electrode group;
A resin-made holding member for holding the case;
With
The case and the holding member are integrally formed by insert molding, and the air supply duct for supplying cooling air for cooling the case to the peripheral portion of the holding member is raised by heat exchange with the case. An electricity storage device characterized by forming an exhaust duct for discharging warm cooling air.   The power storage device according to claim 1, wherein the positive and negative electrodes of the electrode group are led out to an end surface of the holding member through positive and negative electrode conductive members inserted into the holding member, respectively.   The electric storage device according to claim 2, wherein the holding member has a rectangular cross section, and the positive and negative electrode conductive members are led out to two end faces of the holding member facing each other.   4. The electricity storage according to claim 3, wherein the air supply duct and the exhaust duct are formed at end portions along the other two opposite sides of the holding member that intersect the two sides of the holding member. device.   The power storage device according to claim 2, wherein the positive and negative electrode conductive members, the air supply duct, and the exhaust duct are provided symmetrically with respect to a central axis that intersects a plane of the case.   The positive and negative electrode conductive members are respectively joined to the positive and negative electrodes of the electrode group on the side opposite to the end face of the holding member, and an insulating seal material is disposed around the joint portion. The power storage device according to claim 2, wherein the power storage device is inserted into the holding member by insert molding together with the negative electrode conductive member.   A safety valve formed by thinning a part of the case for releasing the internal pressure of the case is provided, and the gas released by the release of the internal pressure is discharged at a location adjacent to the safety valve of the holding member. The gas storage duct according to claim 1, further comprising a gas discharge duct.   The positive and negative electrodes of the electrode group are led to the end surface of the holding member through positive and negative conductive members inserted into the holding member, respectively, the positive and negative conductive members, the air supply duct and the exhaust duct, and The power storage device according to claim 7, wherein the safety valve and the gas discharge duct are provided symmetrically with respect to a central axis that intersects a plane of the case.   2. The holding member has a plurality of rib-shaped protrusions on one side of the case for rectifying the cooling air flowing between the air supply duct and the exhaust duct. The electricity storage device described in 1.   A power storage module comprising a plurality of the power storage devices according to claim 1 laminated.   11. The power storage module according to claim 10, wherein a through hole is formed in the holding member, and the plurality of power storage devices are fixed by passing a rod-shaped member through the through hole.   Each of the power storage devices is led out to the end surface of the holding member through positive and negative electrode conductive members inserted into the holding member, respectively, the positive and negative electrodes of the electrode group, the positive and negative electrode conductive members, the air supply duct and the The exhaust duct is provided symmetrically with respect to a central axis that intersects the plane of the case, and the plurality of power storage devices are arranged such that the positive and negative electrode conductive members are opposite to each other between adjacent power storage devices. The power storage module according to claim 10, wherein the power storage module is stacked.   Each of the power storage devices includes a safety valve that is formed by thinning a part of the case to release the internal pressure of the case, and is released by releasing the internal pressure at a location adjacent to the safety valve of the holding member. A gas discharge duct for discharging the gas to be discharged is further formed, and the positive and negative electrode conductive members, the air supply duct and the exhaust duct, and the safety valve and the gas discharge duct are connected to the plane of the case. The power storage module according to claim 12, wherein the power storage module is provided symmetrically with respect to intersecting central axes.   A metal plate for connecting the positive and negative electrode conductive members of the adjacent power storage devices, a voltage detection line connected in advance to the metal plate, a cell controller connected in advance to the voltage detection line and controlling the power storage device; The power storage module according to claim 12, further comprising: a control board having:   The motor vehicle provided with the electrical storage module of Claim 10.

Images