WO2006030659A1

WO2006030659A1 - Battery pack

Info

Publication number: WO2006030659A1
Application number: PCT/JP2005/016256
Authority: WO
Inventors: Terufumi Hamano
Original assignee: Max Co., Ltd.
Priority date: 2004-09-13
Filing date: 2005-09-05
Publication date: 2006-03-23
Also published as: JP2006080045A; JP4747539B2

Abstract

A support plate (19) having substantially the same shape as the plane shape of the inner space of a lower case is bonded to the upper surface of plate-like battery cells (15) that are bonded and layered in a lower case (12). When strong vibration is applied to a battery pack (11), the battery cells supported by the support plate do not vibrate. There is no possibility of the battery cells colliding with the inner wall surface of the lower case and causing damage on electrode terminals (16, 17) and lead strips (18).

Description

Specification

Battery pack

Technical field

TECHNICAL FIELD [0001] The present invention relates to a battery pack for a rechargeable electric tool, and more particularly to a battery pack having an improved battery cell fixing method.

Background art

A battery pack of a rechargeable electric tool is composed of a battery case and a plurality of secondary battery cells connected in series accommodated in the battery case. Japanese Patent Application Laid-Open No. 10-012204 discloses a battery pack in which cylindrical battery cells are accommodated in a cylindrical battery case. Japanese Patent Laid-Open No. 2002-219672 discloses a battery pack in which cylindrical battery cells are accommodated in a rectangular battery case. Japanese Patent Laid-Open No. 2000-200593 discloses a battery pack that is reduced in size by using plate-shaped battery cells in a laminate sheet package.

FIG. 9A and FIG. 9B show a rectangular battery pack in which laminated sheet package type battery cells are stacked according to the related art of the present invention. 1 is a battery case, and 2 is a laminated sheet package type lithium secondary battery cell (hereinafter simply referred to as a battery cell). The battery cell 2 is a sheet material obtained by laminating an aluminum foil with a polymer resin sheet, and is configured by covering a lithium secondary battery element. The planar shape is square. The positive terminal 3 is pulled out from one end, and the negative terminal 4 is pulled out from the other end. A plurality of battery cells 2 are alternately stacked in opposite directions, and a positive terminal 3 and a negative terminal 4 that are opposed to each other in the vertical direction are connected in series with a lead piece 5.

[0004] Between each battery cell 2 and the lowermost battery cell and the bottom surface in the battery case 1 are bonded with a double-sided adhesive tape (not shown). A foamed rubber block 6 or the like is inserted into the space between the uppermost battery cell and the ceiling surface of the battery case 1 to hold down the battery cell 2.

[0005] An electric power tool is greatly affected by vibration generated by the tool itself and an impact caused by a reaction force during work. In particular, a hammer drill or a nailing machine has a high acceleration and a large amplitude vibration. When a battery pack in which laminated sheet package type battery cells are bonded and laminated as shown in FIGS. 9A and 9B is used with such an electric tool, the entire battery cell is not firmly fixed. In addition, since the laminate coating of the battery cell is flexible, the entire stacked battery cell vibrates in the battery case. As a result, the upper-layer battery cell may collide with the inner wall of the battery case, and the lead piece, lead wire or wiring cord may be disconnected, or the battery cell terminal may be damaged.

Disclosure of the invention

[0006] One or more embodiments of the present invention provide a battery pack in which plate-shaped battery cells are stacked, in which the risk of disconnection or damage to terminals due to vibration of the battery cells is eliminated. provide.

[0007] According to one or more embodiments of the present invention, the battery pack includes a plurality of plate-shaped battery cells stacked and bonded, and the stacked battery cells are bonded and accommodated in the battery case. Configured. The battery pack has a support plate that is attached between the flat portions of the stacked battery cells or between the battery cells and whose end face is in contact with the inner wall surface of the battery case.

[0008] According to one or more embodiments of the present invention, the support plate is interposed between the battery cells.

[0009] According to one or more embodiments of the present invention, the battery pack includes a plurality of plate-shaped battery cells stacked and bonded, and the stacked battery cells are bonded and accommodated in the battery case. Configured. The battery pack includes a support plate that is provided on each of the planar portions of the stacked battery cells and that has an end surface that abuts against an inner wall surface of the battery case.

[0010] Further, according to one or more embodiments of the present invention, at least a part of the flat portion positioned between the upper end surfaces of the support plate is in contact with the inner wall surface of the battery case.

[0011] According to one or more embodiments of the present invention, the battery pack includes a plurality of plate-shaped battery cells stacked and bonded, and the stacked battery cells are bonded and accommodated in the battery case. Configured. At least one partition member that partitions the interior of the battery case into a plurality of layers is provided. Each plate battery cell or each plate battery cell integrated body obtained by stacking the plate battery cells is mounted and bonded to the corresponding partition member. [0012] According to one or more embodiments of the present invention, the battery pack includes a plurality of plate-shaped battery cells stacked and bonded, and the stacked battery cells are bonded and accommodated in the battery case. Configured. A spacer is inserted into the space around the battery cell.

In addition, according to one or more embodiments of the present invention, the spacer is formed by filling the surrounding space with a silicone rubber or a foam rubber.

[0014] According to one or more embodiments of the present invention, the battery pack includes a plurality of plate-like battery cells, a battery case that houses the plurality of battery cells, and the battery cell includes the battery. Fixing means for preventing vibration in the case.

[0015] As the fixing means, a support plate that is bonded to the battery cell and has an end face that contacts the inner wall surface of the battery case, a cutting member that partitions the inside of the battery case into a plurality of layers, and a space around the battery cell Spacers, etc. arranged in the

Other features and advantages will be apparent from the description of the examples and the appended claims.

Brief Description of Drawings

FIG. 1A is a front sectional view of a battery pack according to Embodiment 1.

FIG. 1B is a side sectional view of the battery pack according to Example 1.

FIG. 2 is a side sectional view of a battery pack according to Example 2.

FIG. 3 is a side sectional view of a battery pack according to Example 3.

FIG. 4 is a side sectional view of a battery pack according to Example 4.

FIG. 5 is a side sectional view of a battery pack according to Example 5.

FIG. 6 is a side sectional view of a battery pack according to Example 6.

FIG. 7A is a plan sectional view of a battery pack according to Example 7.

FIG. 7B is a side sectional view of the battery pack according to Example 7.

FIG. 8A is a cross-sectional plan view of a battery pack according to Example 8.

FIG. 8B is a side sectional view of the battery pack according to Example 8.

FIG. 9A is a front sectional view of a battery pack according to the related art of the present invention.

FIG. 9B is a side sectional view of the battery pack of FIG. 9A. Explanation of symbols

11 Battery pack

12 Lower case

12a divider

13 Kano Kuichi

15 Plate battery cell

16 Positive terminal

17 Negative terminal

18 Lead piece

19 Support play

20 Box case

21 Spacer

31 Battery pack

32 Battery case

32a recess

33 Support play

41 battery pack

42 Battery case

42a recess

43 Support Play 10

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Example 1

FIG. 1A and FIG. 1B show a battery pack 11. A battery case is composed of a nostab type lower case 12 and an upper cover 13 mounted on the lower case 12. The upper cover 13 and the lower case 12 are joined by means such as adhesive or high frequency welding. As shown in FIG. 1A, latch portions 14 are formed on the left and right side surfaces of the lower case 12. When the battery pack 11 is inserted into the bottom surface of the grip portion of an electric tool (not shown), a recess formed in the grip portion The battery pack 11 is fixed by engaging the claw 14a at the tip of the latch portion 14.

In the lower case 12, stacked plate-shaped battery cells 15 (laminated package type lithium secondary battery cells) are accommodated (in the example of the figure, five layers). The lowermost (first stage) plate battery cell 15 is bonded to the bottom surface inside the lower case 12 with a double-sided adhesive tape (not shown). The plate-like battery cells 15 thereon are also bonded with double-sided adhesive tape.

[0021] The plurality of stacked battery cells 15 are alternately arranged in opposite directions. The positive terminal 16 and the negative terminal 17 facing upward and downward are connected by lead pieces 18 respectively. The positive terminal 16 of the uppermost plate battery cell 15 and the negative terminal 17 of the lowermost plate battery cell 15 are a negative electrode and a positive electrode (not shown) provided on the side surfaces of the upper cover 13 and the lower case 12. Connected to. In addition, a charge protection circuit is built in the lower case 12 as necessary.

[0022] On the upper surface of the uppermost plate-like battery cell 15, a support plate 19 having a length substantially equal to the front-rear width (the left-right direction in FIG. 1B) inside the lower case 12 is adhered with a double-sided adhesive tape. It is. When the battery pack 11 vibrates in the front-rear direction, the end surface of the support plate 19 is in contact with the inner wall surface of the lower case 12, so that the plate-shaped battery cell 15 is supported by the support plate 19 and lowered. Does not move relative to case 12. For this reason, breakage and disconnection of the lead piece 18 are prevented.

Example 2

[0023] The position of the support plate 19 is not necessarily the upper surface of the plate-shaped battery cell assembly. As shown in FIG. 2, the support plate 19 is located between the uppermost battery cell and the lower four battery cells. May be arranged. Further, it may be between the fourth stage and the third stage. Although illustration is omitted, it is necessary to form a concave notch in the left and right center part of one end of the support plate 19 so that V does not interfere with the lead piece 18.

Example 3

FIG. 3 shows a configuration in which a support plate 19 is disposed between all the plate battery cells 15. Although the number of parts increases, the vibration prevention effect of the battery cell is further improved.

Example 4

FIG. 4 shows a structure in which a horizontal partition plate 12 a integrated with the lower case 12 is arranged in multiple layers in the lower case 12. Double-sided adhesive tape with plate-shaped battery cell 15 on each partition plate 12a Glued and supported by etc. By attaching the plate-like battery cells 15 to the partition plate 12a one by one, a large-mass battery cell block can be prevented from being damaged as in the case where the plate-like battery cells 15 are directly stacked. For this reason, vibration of the plate battery cell 15 is prevented.

Example 5

In the battery pack 11 shown in FIG. 5, a plurality of box-type cases 20 each containing one plate-like battery cell 15 are bonded and laminated with a double-sided adhesive tape. This case laminate is bonded to the inner bottom surface of the lower case 12. The box-shaped case 20 is rigid and not as flexible as the laminated package of plate-shaped battery cells 15. Therefore, even when the battery pack 11 is shaken or shaken, the stacked box-shaped case 20 swings. Example 6

The battery pack 11 shown in FIG. 6 is an example in which a spacer 20 such as silicone rubber or foam rubber is inserted around the plate-shaped battery cell 15 in the lower case 12 or at least in the spaces at the front and rear ends. Is shown. These spacers 20 may be formed in advance in a shape that matches the space inside the battery case. Alternatively, after the plate-shaped battery cell 15 is loaded in the lower case 12, a filler in a fluid state is used. It may be injected and solidified.

Example 7

In the battery pack 31 shown in FIGS. 7A and 7B, the plate-like battery cells 15 are arranged vertically. An assembly of the plate battery cells 15 bonded to each other by the double-sided adhesive tape is bonded to the right inner wall surface of the battery case 32. A support plate 33 adhered to the left side surface of the battery pack 15 has a gap between the battery pack 15 and the left inner wall surface of the battery case 32. The support plate 33 is fitted in a recess 32a formed on the left inner wall surface of the battery case 32, and is bonded to the plate battery cell 15 or both the plate battery cell 15 and the battery case 32, so that the plate battery Prevents vibration of the cell assembly. As shown in FIGS. 7A and 7B, the support plate 33 is fitted into the recess 32a of the battery case 32, and the plane dimension of the support plate 33 is substantially equal to the vertical and horizontal dimensions of the left and right inner wall surfaces of the battery case. Positioning may be performed by bringing the end surface of the support plate 33 into contact with the front and rear inner wall surfaces of the case 32. [0029] In the battery pack 41 shown in Figs. 8A and 8B, the left and right wall surface force mechanisms of the battery case 42 are formed in a convex shape for reasons of design or design. In this case, the bonding area for bonding and fixing the plate-shaped battery cell 15 to the left and right inner wall surfaces of the battery case 42 is insufficient. Therefore, support plates 43 similar to those in FIGS. 7A and 7B are bonded to the left and right surfaces of the plate-shaped battery cell assembly. By fitting the support plate 43 into the recesses 42a formed on the left and right inner wall surfaces of the battery case 42, the plate-shaped battery cell assembly is fixed so as not to vibrate.

In the above-described embodiment, the adhesive force of each battery cell, and the force described that the double-sided adhesive tape is used for adhesion between the battery cell assembly and the inner surface of the battery case may be adhered using various adhesives. .

[0030] Further, the present invention is not limited to the above-described embodiments, and various modifications are possible within the technical scope of the present invention, and it is natural that the present invention extends to those modifications. is there.

This application is based on a Japanese patent application filed on September 13, 2004 (Japanese Patent Application No. 2004-266059), the contents of which are incorporated herein by reference.

Industrial applicability

[0031] According to one or more embodiments of the present invention, in the battery pack, the plane of the internal space of the battery case between the upper surface of the plate-shaped battery cells stacked in the battery case or between the battery cells. A support plate having substantially the same shape as that of the battery case is interposed, the inside of the battery case is divided into a plurality of layers by partition members, and the battery cells are individually mounted on the partition members at each stage, or the battery cell It is possible to prevent the battery cell from vibrating in the battery case by inserting a spacer into the surrounding space. This eliminates the possibility of the battery cell colliding with the inner wall surface of the battery case and damaging the electrode terminals and lead wires.

[0032] According to one or more embodiments of the present invention, in a battery pack in which a plurality of plate-like battery cells are bonded and stacked inside a battery case, the upper surface of the stacked battery cells or the battery cells. In between, a support plate having substantially the same shape as the planar shape of the internal space of the battery case is interposed. Also, this support plate is interposed between each battery cell. May be. By interposing the support plate in the battery cell, when vibration is applied to the battery pack, the support plate in contact with the inner wall surface of the battery case prevents the battery cell from vibrating, and the battery electrode terminal due to vibration And damage to lead wires and battery cells are prevented.

Claims

The scope of the claims

[1] a plurality of plate-like battery cells;

A battery case containing the plurality of battery cells;

A battery pack comprising: fixing means for preventing the battery cell from vibrating in the battery case.

[2] The battery pack according to claim 1, wherein the fixing means is bonded onto a flat portion of the battery cell.

[3] The battery knock according to claim 2, wherein the fixing means is provided on flat portions on both sides of the battery cell.

[4] The battery pack according to claim 1, wherein the fixing means is adhered between the adjacent battery cells.

[5] The battery pack according to claim 4, wherein the fixing means is interposed between the battery cells.