JP2011181369A - Laminated cell battery structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminated cell battery structure, capable of making a sealing section of a positive electrode and a negative electrode of each laminated cell battery hardly destroyed, and capable of improving durability of each laminated cell battery. <P>SOLUTION: The laminated cell battery structure 1 is made by laminating a plurality of laminated cell batteries 3 wherein battery bodies 32 are housed in a flexible sheet-like container 31. Each laminated cell battery 3 is held in a holding frame 2 for holding sides at all four sides as a connection cell set 11. All of positive electrodes 33A and all of negative electrodes 33B are pulled out in parallel in a plane direction of the laminated cell batteries 3, respectively. All of positive electrodes 33A pulled out in parallel in the plane direction are combined by being pinched by a positive side coupling member 4A, and all of negative electrodes 33B pulled out in parallel in the plane direction are combined by being pinched by a negative side coupling member 4B. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a laminate cell battery structure formed by laminating a plurality of laminate cell batteries.

Conventionally, there are various types of batteries. Among them, a laminated cell battery in which a battery main body is housed in a flexible sheet-like container formed by coating the surface of an aluminum base with an insulating resin, Many demands are expected because it is easy to manufacture, easy to handle, and inexpensive.
Laminate cell batteries can be used by laminating a plurality of sheets and flexibly connecting the electrodes of each battery by any of the connection methods of parallel connection or series connection.
As a method for connecting electrodes of batteries, for example, there is a method disclosed in Patent Document 1. In the battery and the assembled battery manufacturing method of Patent Document 1, the negative electrode terminal of the unit cell is formed in a bent shape having a convex portion, and the positive electrode terminal of the unit cell has a receiving part made of a notch. It is formed in a bent shape. And when these single cells are arranged next to each other, the bent portion in the negative electrode terminal of the single cell overlaps with the bent portion in the positive electrode terminal of the adjacent single cell, and the convex portion and the receiving portion are formed. It can be fitted and joined. Thereby, when joining electrode terminals, these positioning can be made easy.

JP 2007-26907 A

However, in the battery of Patent Document 1, when the bent portion of the negative electrode terminal and the bent portion of the positive electrode terminal are joined, stress is applied to each single cell, and the seal portion of the electrode terminal in each single cell is It becomes easy to be destroyed.
Therefore, when the durability of the unit cell is taken into consideration, further contrivance is required for the structure for joining the electrode terminals together.

  The present invention has been made in view of such conventional problems, and it is possible to make it difficult for the electrode seal portion in each laminate cell battery to be broken, and to improve the durability of each laminate cell battery. A battery structure is to be provided.

The present invention relates to a laminate cell battery in which a battery body is housed in a flexible sheet-like container, and a plurality of laminate cell batteries each having a pair of sheet-like electrodes drawn out from the battery body are laminated. A structure,
The laminated cell battery laminated with a plurality of sheets is held as a connection cell set in a holding frame that holds the sides of the four sides,
All of the electrodes are drawn out parallel to the surface direction of the laminate cell battery,
The electrodes drawn out in parallel to the surface direction are bonded to each other in a state of being sandwiched between connecting members (claim 1).

The laminate cell battery structure of the present invention is formed by holding a plurality of laminated cell batteries stacked as a connection cell set in a holding frame that holds the four sides. In the connection cell set, the electrodes of the plurality of laminate cell batteries are coupled together in a state of being sandwiched by the connecting members.
Thereby, various joining, such as laser welding, resistance welding, and bolt joining, can be performed with the electrode in each laminate cell battery facing the connecting member. Therefore, when this joining is performed, it is possible to prevent unnecessary stress from being applied to the electrode seal portion in each laminate cell battery.

  Therefore, according to the laminate cell battery structure of the present invention, the electrode seal portion in each laminate cell battery can be hardly broken, and the durability of each laminate cell battery can be improved.

The perspective view shown in the state which decomposed | disassembled the laminated cell battery structure in Example 1. FIG. The top view which shows the lamination cell battery structure which laminated | stacked the holding frame which comprises the connection cell group in Example 1, and formed the lamination | stacking holding frame group. The top view which shows the lamination cell battery structure which arrange | positioned the lamination | stacking holding | maintenance frame frames adjacently in Example 1. FIG. Sectional explanatory drawing which shows the periphery of the electrode of a laminated cell battery in Example 1. FIG. Explanatory drawing which shows the state which couple | bonded the plus side connection member (minus side connection member) in Example 1 with each electrode. Explanatory drawing which shows the state which couple | bonded the other plus side connection member (minus side connection member) in Example 1 with each electrode. Explanatory drawing which shows the state which couple | bonded the other plus side connection member (minus side connection member) in Example 1 with each electrode. The top view which shows the laminated cell battery structure which laminated | stacked the holding frame which comprises a connection cell group in Example 2, and formed the lamination | stacking holding frame group. Sectional explanatory drawing which shows the laminate cell battery structure which comprises the connection cell group in Example 2. FIG.

A preferred embodiment of the above-described laminated cell battery structure of the present invention will be described.
In the present invention, the connecting member can be formed by being bent so as to sandwich the electrode.
In this case, the electrode can be held by a connecting member having a simple structure.

Further, the connecting member includes a folded holding portion formed by folding back so as to sandwich the electrode, and a connecting portion that connects base ends opposite to the folded tip portions of the folded holding portions adjacent to each other. It can also be formed in a wave shape (claim 3).
In this case, the wavy connecting member can be stably brought into contact with the electrode.

In the connecting member, a spacer is disposed between the folded holding portions adjacent to each other, and the folded folded clamp portion is clamped by tightening a bolt into a through hole provided in the folded sandwiched portion, the spacer, and the electrode. It is preferable that the part and the electrode are in close contact with each other (claim 4).
In this case, the folded holding portion of the connecting member and the electrode can be stably adhered.
In addition, a connection member and a spacer can be made into separate components, and can also be made into an integrated component.

Further, the connection cell set is formed by electrically connecting the electrodes having the same polarity in parallel, connecting the connecting members with a bus bar, and electrically connecting the two connection cell sets in series. (Claim 5).
In this case, it is possible to prevent unnecessary stress from being applied to the electrode seal portion of each laminated cell battery, and to electrically connect two connection cell sets electrically connected in parallel to each other in series by the bus bar. .

In addition, a plurality of the holding frames constituting the connection cell set are laminated, and insulating end plates provided with conductive plate terminal portions from both sides in the laminating direction with respect to the plural laminated holding frames, respectively. The plurality of holding frames are assembled as a laminated holding frame by laminating and tightening members between the insulating end plates, and the laminated holding frame is connected to the plate terminal portion to which the bus bar is connected. It can be electrically connected to the outside (Claim 6).
In this case, when the laminated holding frame assembly is electrically connected to the outside, from the wire harness used for this connection, etc., to the electrode seal portion in each laminated cell battery in the connection cell set constituting the end holding frame. It is possible to prevent unnecessary stress from being applied.

Hereinafter, examples of the laminated cell battery structure of the present invention will be described with reference to the drawings.
Example 1
As shown in FIG. 1, the laminate cell battery structure 1 of this example is formed by laminating a plurality of laminate cell batteries 3 in which a battery main body 32 is housed in a flexible sheet-like container 31. The laminate cell battery 3 is formed by drawing a sheet-like plus electrode 33A and a sheet-like minus electrode 33B from the battery body 32 to the outside. A plurality of laminated cell batteries 3 are held as a connection cell set 11 in a holding frame 2 that holds the four sides.
All of the plus electrodes 33A and all of the minus electrodes 33B are drawn out parallel to the surface direction of the laminate cell battery 3. All the positive electrodes 33A drawn out parallel to the surface direction are coupled together while being sandwiched by the positive side connecting member 4A, and all the negative electrodes 33B drawn out parallel to the surface direction are connected to the negative side connecting member. It is combined in a state of being sandwiched by 4B.

Below, it demonstrates in full detail with reference to FIGS. 1-7 about the laminated cell battery structure 1 of this example.
As shown in FIG. 4, the sheet-like container 31 of this example is formed by using a pair of aluminum sheets 311 whose inner peripheral side is covered with an insulating resin 312. That is, the sheet-like container 31 is welded with the insulating resins 312 facing each other in the pair of aluminum sheets 311 in the left-right direction (lateral direction orthogonal to the electrode drawing direction), and the vertical direction (electrode drawing direction). In the side portion, each insulating resin 312 of the pair of aluminum sheets 311 and each insulating resin 331 applied on the surface of the plus electrode 33A and the minus electrode 33B are welded to form a bag shape. Further, in the laminate cell battery 3, an electrolytic solution is placed in a gap 30 in which the battery body 32 is disposed.

  In the laminated cell battery 3 of this example, a plate-shaped battery body 32 is wrapped from both sides by a pair of aluminum sheets 311, and a sheet-like positive electrode 33 </ b> A provided on one side of the battery body 32, A sheet-like negative electrode 33 </ b> B provided on the other side is formed by being drawn out from between the ends of the pair of aluminum sheets 311. The seal portion 313 of the plus electrode 33A and the minus electrode 33B in each laminate cell battery 3 is formed as an end portion of the sheet-like container 31 from which these electrodes 33A and 33B are drawn. Further, the plus electrode 33A and the minus electrode 33B are formed of a conductor made of a copper material.

As shown in FIG. 1, the holding frame 2 of this example is disposed on one side of the laminated cell battery 3 from which the positive electrode 33A is drawn and on the other side of the laminated cell battery 3 from which the negative electrode 33B is drawn. A pair of upper and lower holding frame pieces 21 and a pair of left and right holding frame pieces 22 arranged on the left and right side portions orthogonal to one side portion and the other side portion are combined to form a square frame shape. Has been.
In the pair of upper and lower holding frame pieces 21, a plurality of insertion holes 211 are formed side by side for inserting and arranging the plus electrode 33 </ b> A or the minus electrode 33 </ b> B of each laminate cell battery 3. A plurality of insertion holding recesses 221 for inserting and holding the left and right side portions of each laminate cell battery 3 are formed side by side on the inner side surface of the pair of left and right holding frame pieces 22. In addition, on the outer surface of the pair of left and right holding frame pieces 22, a recess 222 is formed in which a fastening member for holding the stacked state of the holding frame 2 is arranged.

As shown in FIG. 5, each connecting member 4A, 4B of this example is formed by being bent so as to sandwich each electrode 33A, 33B. The plus side connecting member 4A includes a folded holding portion 41 formed by folding back the number corresponding to the number of the plus electrodes 33A so as to hold the plus electrode 33A from both sides, and a folded tip portion 411 of the folded holding portion 41 adjacent to each other. Is formed in a wave shape by the connecting portion 42 that connects the base end portions 413 on the opposite side. Further, the minus side connecting member 4B includes a folded holding portion 41 formed by folding back the number corresponding to the number of the minus electrodes 33B so as to sandwich the minus electrode 33B from both sides, and a folded tip portion of the folded holding portion 41 adjacent to each other. It is formed in a wave shape by a connecting portion 42 that connects base end portions 413 opposite to 411.
The plus side connecting member 4A and the minus side connecting member 4B in this example are formed by bending a single metal plate into a wave shape. Each folded holding portion 41 in each connecting member 4A, 4B is formed in a state in which a gap 410 sandwiching each electrode 33A, 33B is provided and the metal plate portions face each other.

  The plus side connecting member 4A is disposed on the outer surface of the upper holding frame piece 21, and each plus electrode 33A is inserted into the gap 410 of each folded holding portion 41, and welding such as laser welding and resistance welding is performed. Coupled with the positive electrode 33A. The minus side connecting member 4B is disposed on the outer surface of the lower holding frame piece 21, and each minus electrode 33B is inserted into the gap 410 of each folded holding portion 41, and welding such as laser welding or resistance welding is performed, It couple | bonds with each minus electrode 33B.

As shown in FIG. 5, an insertion arrangement hole 412 can be formed in the folded tip end portion 411 of the folded holding portion 41 in each of the connecting members 4 </ b> A and 4 </ b> B. In this case, the electrodes 33 </ b> A and 33 </ b> B of each laminate cell battery 3 can be inserted into the insertion placement holes 412. As a result, the dimensional tolerance of the protruding length of each electrode 33A, 33B can be increased, and even if the tip position of each electrode 33A, 33B is not aligned, each connecting member 4A, 4B can be arranged and coupled stably. can do.
Moreover, the folding | reversing clamping part 41 in each connection member 4A, 4B can also be formed in the length which anticipated the protrusion length of each electrode 33A, 33B, as shown in FIG. Also by this, the dimensional tolerance of the protrusion length of each electrode 33A, 33B can be taken large, and even if the tip position of each electrode 33A, 33B is not aligned, each connecting member 4A, 4B is stably arranged. Can be combined.

  Further, as shown in FIG. 7, the folded holding portion 41 in each of the connecting members 4 </ b> A and 4 </ b> B can be bolted and bonded to each of the electrodes 33 </ b> A and 33 </ b> B. Specifically, in the plus-side connecting member 4A, the spacer 51 is disposed between the mutually adjacent folded holding portions 41, and the bolts 52 are placed in the through holes provided in the folded holding portion 41, the spacer 51, and the plus electrode 33A, respectively. Through. Then, by tightening the bolt 52 and the nut 53, the folded holding portion 41, the spacer 51, and the plus electrode 33A can be sandwiched between them, and the folded holding portion 41 and the plus electrode 33A can be brought into close contact with each other. Similarly, in the minus side connecting member 4B, the spacer 51 is arranged between the adjacent folded holding portions 41, and the bolts 52 are passed through the through holes provided in the folded holding portion 41, the spacer 51, and the minus electrode 33B, respectively. Then, by tightening the bolt 52 and the nut 53, the folded holding portion 41, the spacer 51, and the minus electrode 33B can be sandwiched between them, and the folded holding portion 41 and the minus electrode 33B can be brought into close contact with each other.

  As shown in FIG. 2 and FIG. 3, the laminated cell battery structure 1 of this example has a plurality of holding frames 2 that constitute the connection cell set 11 and a plurality of laminate cell batteries 3 that constitute the connection cell set 11. These are configured to be electrically connected in series. A plurality of laminate cell batteries 3 constituting each connection cell set 11 are connected in parallel, and each connection cell set 11 is connected in series.

More specifically, the series connection of the connection cell sets 11 is such that the plus side connection member 4A in one connection cell set 11 and the minus side connection member 4B in the other connection cell set 11 are arranged on the same side. Thus, the holding frames 2 constituting the two connection cell sets 11 are stacked. Then, the plus side connecting member 4A in one connected cell set 11 and the minus side connecting member 4B in the other connected cell set 11 are connected by a bus bar 61A, and the two connected cell sets 11 are electrically connected in series. . An arbitrary number of the connection cell sets 11 can be stacked, and a fastening member can be arranged in the recess 222 provided in the pair of left and right holding frame pieces 22 in each holding frame 2 and can be integrated by this fastening member. .
The bus bar 61A alternately connects connection cell sets 11 adjacent to each other on one side and the other side of the laminate cell structure 1 in which the electrodes 33A and 33B are arranged. Between the connection cell groups 11 in which the bus bar 61A does not appear on the front side, the bus bar 61A is connected on the back side.

  As shown in FIGS. 2 and 3, the laminated cell battery structure 1 of this example includes a plurality of holding frames 2 constituting the connection cell set 11, and a plurality of holding frames 2 are stacked in the stacking direction. Insulating end plates 25 provided with conductive plate terminal portions 251 are laminated from both sides. The plurality of holding frames 2 are assembled as a laminated holding frame assembly 12 by tightening a fastening member between the insulating end plates 25. In the laminated holding frame 12, the plus side connecting member 4A or the minus side connecting member 4B in the end holding frame 2A which is the holding frame 2 laminated at one end, and the insulating end plate 25 adjacent to the end holding frame 2A. Is connected to the plate terminal portion 251 by a bus bar 61B. The laminated holding frame 12 is electrically connected to the outside by the wire harness 62 from the plate terminal portion 251 to which the bus bar 61B is connected.

  As described above, the laminated cell battery structure 1 of the present example is formed by holding the laminated cell battery 3 in which a plurality of layers are stacked as the connection cell set 11 in the holding frame 2 that holds the four sides. In the connection cell set 11, the plus electrodes 33A in the plurality of laminate cell batteries 3 are joined together while being sandwiched between the plus side connecting members 4A, and the minus electrodes 33B in the plurality of laminate cell batteries 3 are minus. They are coupled in a state of being sandwiched between the side connecting members 4B.

  Thereby, various joining, such as laser welding, resistance welding, and bolt joining, can be performed by inserting the plus electrode 33A in each laminate cell battery 3 into each folded holding portion 41 in the plus side connecting member 4A. Therefore, when this joining is performed, it is possible to prevent unnecessary stress from being applied to the seal portion 313 of the plus electrode 33 </ b> A in each laminate cell battery 3. Similarly, the minus electrode 33B in each laminate cell battery 3 is inserted into each folded holding portion 41 in the minus side connecting member 4B, and various kinds of joining such as laser welding, resistance welding, and bolt joining can be performed. it can. Therefore, when this joining is performed, it is possible to prevent unnecessary stress from being applied to the seal portion 313 of the negative electrode 33 </ b> B in each laminate cell battery 3.

In addition, the above-described configuration in which the holding frames 2 constituting the connection cell set 11 are laminated together prevents unnecessary stress from being applied to the seal portions 313 of the plus electrode 33A and the minus electrode 33B in each laminate cell battery 3, and the connection The cell sets 11 can be electrically connected in series.
Further, when electrically connecting each connection cell set 11 in the laminated holding frame 12 to the outside, the end holding frame is provided from the wire harness 62 and the like by using the insulating end plate 25 provided with the plate terminal portion 251. It is possible to prevent unnecessary stress from being applied to the seal portion 313 of the plus electrode 33A or the minus electrode 33B in each laminate cell battery 3 in the connection cell set 11 constituting 2A.

  Therefore, according to the laminate cell battery structure 1 of the present example, the seal portions 313 of the plus electrode 33A and the minus electrode 33B in each laminate cell battery 3 can be hardly broken, and the durability of each laminate cell battery 3 can be reduced. Can be improved.

(Example 2)
In this example, as shown in FIGS. 8 and 9, the connecting members 4A and 4B are arranged in the gap between the sheet metal part 45 forming the facing part 451 facing the electrodes 33A and 33B and the electrodes 33A adjacent to each other. In this example, the spacer 452 is configured.
Each facing portion 451 can be formed by cutting and standing from each sheet metal portion 45. The spacer 452 can be formed integrally with the sheet metal part 45, or can be formed separately from the sheet metal part 45.

Further, a bolt 52 is passed through a through hole provided in each of the sheet metal part 45 and each of the electrodes 33A and 33B constituting each of the connecting members 4A and 4B, and the bolt 52 and the nut 53 are tightened, so that a plurality of facings are provided therebetween. The facing portion 451 and the electrodes 33A, 33B can be brought into close contact with each other by sandwiching the portion 451 and the plurality of electrodes 33A, 33B.
The facing portion 451 in each sheet metal portion 45 is formed to have a width substantially the same as the width of each electrode 33A, 33B, and each spacer 452 is formed in a cylindrical shape that serves as a pedestal when tightening the bolt 52 and the nut 53. ing.
Also in this example, the other configuration of the laminated cell battery structure 1 is the same as that of the first embodiment, and the same effects as those of the first embodiment can be obtained.

DESCRIPTION OF SYMBOLS 1 Laminated cell battery structure 11 Connection cell group 12 Lamination holding frame frame 2 Holding frame 25 Insulating end plate 3 Laminated cell battery 31 Sheet-like container 32 Battery main body 33A Positive electrode 33B Negative electrode 4A Positive side connection member 4B Negative side connection member 41 Folding clamping part 411 Folding tip part 42 Connecting part 51 Spacer 52 Bolt 53 Nut 61 Bus bar

Claims (6)

A laminated cell battery structure in which a battery main body is housed in a flexible sheet-like container and a plurality of laminated cell batteries each having a pair of sheet-like electrodes drawn out from the battery main body are laminated. And
The laminated cell battery laminated with a plurality of sheets is held as a connection cell set in a holding frame that holds the sides of the four sides,
All of the electrodes are drawn out parallel to the surface direction of the laminate cell battery,
A laminated cell battery structure characterized in that the electrodes drawn out in parallel to the surface direction are joined together in a state of being sandwiched between connecting members.   The laminate cell battery structure according to claim 1, wherein the connecting member is formed by being bent so as to sandwich the electrode.   2. The laminated cell battery structure according to claim 1, wherein the connecting member is a folded holding portion formed by folding back so as to sandwich the electrode, and a folded tip portion of the folded holding portion adjacent to each other on the opposite side. A laminated cell battery structure, wherein the laminated cell battery structure is formed into a wave shape by a connecting portion that connects base end portions.   4. The laminated cell battery structure according to claim 3, wherein in the connection member, a spacer is disposed between the folded and sandwiched portions adjacent to each other, and the folded sandwiched portion, the spacer, and the electrode provided in the electrode, respectively. A laminated cell battery structure, wherein the folded holding portion and the electrode are brought into close contact with each other by tightening a bolt through the hole. In the laminated cell battery structure according to claim 3, the connection cell set is formed by electrically connecting the electrodes of the same polarity in parallel.
A laminated cell battery structure, wherein the connecting members are connected to each other by a bus bar, and the two connected cell groups are electrically connected in series. In the laminated cell battery structure according to any one of claims 1 to 5, a plurality of the holding frames constituting the connection cell set are laminated,
Insulating end plates provided with conductive plate terminal portions are respectively laminated from both sides in the laminating direction with respect to the plurality of laminated holding frames, and a plurality of the above-mentioned plural end members are spanned between the insulating end plates. Individual holding frames are assembled as a laminated holding frame,
The laminated cell battery structure is characterized in that the laminated holding frame is electrically connected to the outside from the plate terminal portion to which the bus bar is connected.

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