JP2013182819A - Power storage device and vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve charging and discharging efficiency while suppressing a displacement after lamination of a positive electrode and a negative electrode.SOLUTION: A separator 14 is wound along the circumference of a lamination body 15 by one or more turn, and a first portion 151, a second portion 152, a third portion 153, and a fourth portion 154 of the lamination body 15 are surrounded by the separator 14. An end edge E of the separator 14 is arranged outside of the first portion 151 of the lamination body 15.

Description

  The present invention relates to a power storage device and a vehicle equipped with the power storage device.

  An example of a power storage device (power storage device) is disclosed in Patent Document 1. As shown in FIG. 5, the strip-shaped separator 51 forming the electrode stack unit 50 of the electricity storage device of Patent Document 1 is folded back in a zigzag manner at intervals according to the width dimension of the positive electrode 52 and the negative electrode 53. In the separator 51 folded back in a zigzag shape, a plurality of positive electrode accommodating portions 54 opened on one side thereof are formed, and a plurality of negative electrode accommodating portions 55 opened on the other side are formed. In the electrode stacking unit 50, one positive electrode 52 is accommodated in each positive electrode accommodating portion 54, and one negative electrode 53 is accommodated in each negative electrode accommodating portion 55, whereby each positive electrode 52 and each negative electrode 53 is accommodated. Each positive electrode 52 and each negative electrode 53 are laminated with a separator 51 interposed therebetween.

  A first extension 56 is formed at one end of the separator 51, and a second extension 57 is formed at the other end. The first extension portion 56 is attached to the electrode laminate unit 50 so as to cover the folded portion 55a provided on the opening side of each negative electrode accommodating portion 55, and one end face 50a located in the lamination direction of the electrode laminate unit 50. On the other hand, it is stopped by an adhesive tape 58. Further, the second extension portion 57 is attached to the electrode stacking unit 50 so as to cover the folded portion 54 a provided on the opening side of each positive electrode housing portion 54, and is positioned in the stacking direction in the electrode stacking unit 50. It is fixed to the end face 50b by an adhesive tape 59. Each positive electrode 52 is restrained in each positive electrode housing portion 54 and each negative electrode 53 is placed in each negative electrode housing portion 55 by the scuffing force of the first extension portion 56 and the second extension portion 57 against the electrode stack unit 50. Because of being restrained, positional deviation after lamination in each positive electrode 52 and each negative electrode 53 is suppressed.

JP 2010-199281 A

  By the way, in order to improve the charging / discharging efficiency of such an electrode lamination unit 50, in the lamination direction of the electrode lamination unit 50, by applying a restraining load to the entire surfaces of both end surfaces 50a and 50b of the electrode lamination unit 50, The positive electrodes 52, the negative electrodes 53, and the separators 51 are brought into close contact with each other. However, in the electrode laminate unit 50 of Patent Document 1, the end portion 56a of the first extension portion 56 and the end portion 57a of the second extension portion 57 are positioned on both end faces 50a, 50b located in the stacking direction of the electrode laminate unit 50. doing. For this reason, when a restraining load is applied in the stacking direction of the electrode stacking unit 50, stress concentrates on the end portion 56a of the first extension portion 56 and the end portion 57a of the second extension portion 57, and each positive electrode 52, The entire surface of each negative electrode 53 and separator 51 cannot be adhered uniformly. As a result, the reaction between each positive electrode 52 and each negative electrode 53 becomes non-uniform, and the charge / discharge efficiency of the electrode laminate unit 50 is deteriorated.

  The present invention has been made to solve the above-described problem, and its purpose is to provide a power storage device capable of improving charge and discharge efficiency while suppressing misalignment after lamination in the positive electrode and the negative electrode, and To provide a vehicle.

  In order to achieve the above object, the invention according to claim 1 is a power storage device in which a laminate in which a positive electrode and a negative electrode are alternately stacked is accommodated in a case with the positive electrode and the negative electrode insulated. It is an apparatus, and the laminated body is located at both ends of the laminated body, and is located at both ends of the laminated body and the first part and the second part along the lamination direction of the laminated body, and the surface direction of the laminated body And a third part along the outer periphery of the laminate, and a scoring member that is scrubbed over one circumference along the outer periphery of the laminate, the scoring member comprising at least the first part, The outer end portion of the brazing member that surrounds the second part, the third part, and the fourth part and is wound around the laminated body is the first part side in the laminated body or the second part in the laminated body The gist is that it is arranged on the side.

  According to this invention, the positive electrode and the negative electrode can be constrained by the squeezing force applied to the laminate by the squeezing member, and the displacement of the positive electrode and the negative electrode after lamination can be suppressed. Moreover, since the outer side edge part of the brazing member is arrange | positioned in the 1st site | part side in a laminated body, or the 2nd site | part side in a laminated body, in order to improve the charging / discharging efficiency of a laminated body, a laminated body On the other hand, even when a restraining load is applied in the stacking direction of the stacked body, stress does not concentrate as in the conventional technique. Therefore, the whole surface of the positive electrode and the negative electrode can be uniformly adhered. As a result, the reaction between the positive electrode and the negative electrode becomes uniform, and charge / discharge efficiency can be improved.

  The invention according to claim 2 is the invention according to claim 1, wherein the inner end portion of the brazing member that is brazed to the laminate is the first part side in the laminate or the second end in the laminate. The gist is that it is arranged on the site side.

  According to this invention, in order to improve the charging / discharging efficiency of a laminated body compared with the case where the inner side edge part of the brazing member is arrange | positioned at the 3rd site | part side or the 4th site | part side, On the other hand, when a restraining load is applied in the stacking direction of the stacked body, the entire surfaces of the positive electrode and the negative electrode can be easily adhered uniformly.

  The invention according to claim 3 is the invention according to claim 1 or claim 2, wherein the inner end portion of the brazing member that is brazed to the laminate is the outermost of the negative electrodes constituting the laminate. The gist is that it is located outside the negative electrode.

  According to this invention, compared to the case where the inner end portion of the brazing member is positioned on the inner side of the negative electrode located on the outermost side among the negative electrodes constituting the stacked body in the stacking direction of the stacked body, The brazing member can be shortened as much as possible, and the work of rubbing the brazing member over one circumference along the outer periphery of the laminate can be facilitated.

  According to a fourth aspect of the invention, there is provided the separator according to any one of the first to third aspects, further comprising a separator interposed between the positive electrode and the negative electrode and insulating between the positive electrode and the negative electrode. The separator has a zigzag shape in which extending portions extending from one end to the other end of the laminated body and folded portions obtained by folding the separator are alternately formed, and on one end side of the laminated body among the folded portions. A plurality of positive electrode accommodating portions for accommodating the positive electrode are formed by the first folded portion positioned and the two extending portions continuous to the first folded portion, and is opposite to the first folded portion in the stacked body of the folded portions. A plurality of negative electrode accommodating portions for accommodating the negative electrode are formed by the second folded portion located on the other end side that is the side, and two extending portions continuous to the second folded portion, and the separator also serves as a brazing member It is the gist of.

  According to this invention, the labor of laminating the separators one by one between the positive electrode and the negative electrode can be saved, and the manufacturing process can be simplified as compared with the case where the brazing member and the separator are separate. be able to.

  The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein the fixing member for fixing the outer end portion to a portion along the stacking direction of the laminate in the brazing member. In addition, the gist is to further provide.

According to this invention, it is possible to strengthen the winding of the stacked member with respect to the laminated body.
Invention of Claim 6 is the invention as described in any one of Claims 1-4. WHEREIN: The outer side edge part is welded to the site | part along the lamination direction of the laminated body in a brazing member. Is the gist.

  According to this invention, for example, there is no need to use a fixing member for fixing the outer end portion of the brazing member to a portion along the stacking direction of the laminated body in the brazing member, and the number of parts can be reduced. .

The gist of the invention described in claim 7 is that, in the invention described in any one of claims 1 to 6, the power storage device is a secondary battery.
According to this invention, it can suppress that a malfunction arises in a secondary battery because a positive electrode and a negative electrode will shift | deviate after a lamination | stacking. Moreover, since the charging / discharging efficiency of a laminated body improves, the energy density of a secondary battery can be enlarged.

The gist of the invention according to claim 8 is that the power storage device according to any one of claims 1 to 7 is mounted in a vehicle.
According to the present invention, the positive electrode and the negative electrode are displaced after being stacked, so that it is possible to suppress the occurrence of a problem in the running performance of the vehicle equipped with the power storage device. In addition, since the charge / discharge efficiency of the stacked body is improved, the running performance of the vehicle equipped with the power storage device can be improved.

  According to the present invention, it is possible to improve the charge / discharge efficiency while suppressing misalignment after lamination in the positive electrode and the negative electrode.

(A) is a longitudinal cross-sectional view of the secondary battery in the embodiment, (b) is a cross-sectional view taken along line AA in FIG. The perspective view which shows a positive electrode sheet, a negative electrode sheet, and a separator. The schematic diagram which shows a battery module. The cross-sectional view of the secondary battery in another embodiment. Sectional drawing of the electrode lamination | stacking unit of the electrical storage device in a prior art example.

  Hereinafter, an embodiment in which the present invention is embodied in a secondary battery mounted on a vehicle (for example, an industrial vehicle or a passenger vehicle) will be described with reference to FIGS. The secondary battery is used to drive a travel motor.

  As shown in FIGS. 1A and 1B, the secondary battery 10 includes an electrode body 11 and an aluminum case 20 that houses the electrode body 11. In the case 20, an electrolytic solution is injected from an injection hole (not shown) provided in the case 20. The case 20 includes a case main body 21 that has a bottomed rectangular box shape in which an opening 21 a into which the electrode body 11 can be inserted is formed, and a rectangular plate-shaped lid 28 that closes the opening 21 a of the case main body 21. ing.

  The case main body 21 is formed of a rectangular plate-shaped bottom wall 22 and rectangular plate-shaped first to fourth side walls 22 a, 22 b, 22 c, 22 d erected from the periphery of the bottom wall 22. The first side wall 22 a and the second side wall 22 b are formed so as to extend in parallel with each other in the longitudinal direction of the case main body 21, and the third side wall 22 c and the fourth side wall 22 d are parallel to each other in the short side direction of the case main body 21. It is formed to extend. A positive terminal 25 projects outward from the first side wall 22a near the third side wall 22c, and a negative terminal 26 projects from the first side wall 22a near the fourth side wall 22d. Yes.

  As shown in FIG. 2, the electrode body 11 includes a positive electrode sheet 12 with a strip-shaped separator 14 interposed between a positive electrode sheet 12 as a positive electrode having a rectangular shape and a negative electrode sheet 13 as a negative electrode having a rectangular shape. In a state in which the negative electrode sheet 13 is insulated, the positive electrode sheet 12 and the negative electrode sheet 13 are alternately stacked, and the stacked laminate 15 is formed. In the present embodiment, the positive electrode sheet 12 and the negative electrode sheet 13 have a rectangular shape extending along the longitudinal direction of the case 20, and the positive electrode sheet 12 is formed in a size smaller than the negative electrode sheet 13.

  The positive electrode sheet 12 has an active material layer 12a formed by applying an active material and an uncoated portion 12b not applied with an active material. The current collector 12c protrudes from the edge 121b of the uncoated part 12b. The negative electrode sheet 13 has an active material layer 13a to which an active material is applied and an uncoated portion 13b to which no active material is applied. A current collector 13c protrudes from an edge 131b of the uncoated part 13b. Each positive electrode sheet 12 is laminated in a certain direction so that each current collecting portion 12c overlaps, and each negative electrode sheet 13 is laminated in a certain direction so that each current collecting portion 13c overlaps. In addition, while the metal foil used as the base material of the positive electrode sheet 12 is an aluminum foil, for example, the metal foil used as the base material of the negative electrode sheet 13 is a copper foil, for example.

  As shown in FIG. 1A, the electrode body 11 is formed with a current collection group 12 d formed by collecting current collection portions 12 c of the positive electrode sheets 12. A current collecting terminal 19a having a rectangular plate shape is joined (connected) to the current collecting group 12d by welding (for example, ultrasonic welding). Further, the electrode body 11 is formed with a current collecting group 13d formed by collecting the current collecting portions 13c of the respective negative electrode sheets 13. A current collecting terminal 19b having a rectangular plate shape is joined (connected) to the current collecting group 13d by welding (for example, ultrasonic welding). The current collecting group 12d of the positive electrode sheet 12 and the current collecting group 13d of the negative electrode sheet 13 extend in the same direction (one direction).

  As shown in FIG. 1B, the separator 14 has an extending portion 14a extending from one end to the other end in the surface direction of the laminate 15 (direction parallel to the surfaces of the positive electrode sheet 12 and the negative electrode sheet 13). And the zigzag shape (kaze shape) which formed alternately the folding | turning part 14e which folded the separator 14 is comprised. Specifically, the separator 14 is formed with an extending portion 14a extending from the start end S (one end of the separator 14), which is the inner end portion thereof, longer than the length in the longitudinal direction of the negative electrode sheet 13, and then the extending portion 14a. The leading end is bent toward the start end S side, and the extended portion 14a is formed again. The separator 14 is formed in a zigzag shape by repeating this a plurality of times and repeating a mountain fold and a valley fold.

  And the positive electrode sheet 12 is accommodated by the 1st folding | turning part 141e located in the one end side of the surface direction of the laminated body 15 among the folding | returning parts 14e, and the two extending parts 14a continuous to the 1st folding | turning part 141e. A plurality of positive electrode accommodating portions 141 are formed. In addition, the second folded portion 142e located on the other end side opposite to the first folded portion 141e of the folded portion 14e and the two extending portions 14a continuous to the second folded portion 142e provide a negative electrode A plurality of negative electrode accommodating portions 142 in which the sheet 13 is accommodated are formed.

  The laminated body 15 is laminated in the order of the extension part 14a of the separator 14 → the negative electrode sheet 13 → the extension part 14a of the separator 14 → the positive electrode sheet 12 from one end side to the other end side in the lamination direction. On the other end side in the direction, the layers are laminated so that the lamination is completed in the order of the negative electrode sheet 13 → the extended portion 14 a of the separator 14.

  The separator 14 is formed with an extending portion 14 b extending from the tip of the extending portion 14 a of the separator 14 farthest from the starting end S of the extending portions 14 a of the separator 14 forming the stacked body 15. The extending portion 14b extends from the first folded portion 141e side. The extending portions 14b are positioned at both ends of the stacked body 15, and are positioned at both ends of the stacked body 15 and the first and second portions 151 and 152 along the stacking direction of the stacked body 15. It is set to a length that can be wound over the circumference of the laminate 15 so as to surround the third part 153 and the fourth part 154 along the surface direction of the body 15.

  Here, “the first portion 151 and the second portion 152 that are located at both ends of the stacked body 15 and extend in the stacking direction of the stacked body 15” refers to a portion of the stacked body 15 on the first folded portion 141 e side, This corresponds to a portion of the laminated body 15 on the second folded portion 142e side. Further, “the third portion 153 and the fourth portion 154 that are located at both ends of the stacked body 15 and extend along the surface direction of the stacked body 15” means that the extending portions 14 a It corresponds to the extending portion 14a of the separator 14 located on the outermost side of them.

  Specifically, the extending portion 14b of the separator 14 covers the opening of each negative electrode housing portion 142 and the first folded portion 141e so that the outer side in the surface direction of the stacked body 15 is along the stacking direction of the stacked body 15. It passes to extend. Therefore, the opening of each negative electrode accommodating portion 142 is closed by the extending portion 14b. Further, the extending portion 14b passes so as to extend along the outside of the extending portion 14a connected to the starting end S of the separator 14, and covers the opening of each positive electrode accommodating portion 141 and the second folded portion 142e, The laminate 15 passes through the outer side in the surface direction so as to extend along the lamination direction of the laminate 15. Therefore, the opening of each positive electrode accommodating portion 141 is also closed by the extending portion 14b.

  The extending portion 14b extends along the outer side of the extending portion 14a of the separator 14 located on the opposite side of the starting end S farthest from the starting end S of the extending portions 14a of the separator 14 forming the stacked body 15. It passes to extend. And the termination | terminus E (the other end of the separator 14) which is an outer side edge part of the extension part 14b is extended so that it may be located in the outer side of the site | part which covers the opening of each negative electrode accommodating part 142 in the extension part 14b. That is, the end E of the separator 14 (the end E of the extending portion 14 b) is disposed on the outer side in the surface direction of the stacked body 15 (outside the first portion 151 in the stacked body 15). In other words, the terminal E of the separator 14 does not exist on the surfaces of the positive electrode sheet 12 and the negative electrode sheet 13 (on the surface of the laminate 15). Here, the end E of the separator 14 (the end E of the extending portion 14 b) refers to the end of the separator 14 that has been wound around the outer periphery of the laminate 15 over one turn.

  And the terminal E of the separator 14 is fixed to the part (part along the lamination direction of the laminated body 15 in the extension part 14b) which covers the opening of each negative electrode accommodating part 142 in the extension part 14b with the adhesive tape 30 as a fixing member. As a result, the electrode body 11 is configured. The adhesive tape 30 is made of a material that can withstand the corrosion of the electrolytic solution. As the adhesive tape 30, what has an acrylic adhesive material on the surface of the base material formed with polyethylene is mentioned, for example.

  In this way, the extending portion 14b of the separator 14 has an outer periphery of the stacked body 15 so as to surround the first portion 151, the second portion 152, the third portion 153, and the fourth portion 154 in the stacked body 15. Has been beaten for more than one round. Therefore, in the present embodiment, the separator 14 also serves as a brazing member that is plastered along the outer circumference of the laminate 15 over one round. The starting end S of the separator 14 is disposed on the first portion 151 side in the stacked body 15 and is located on the outer side in the surface direction of the positive electrode sheet 12 and the negative electrode sheet 13. Furthermore, the starting end S of the separator 14 is positioned outside the negative electrode sheet 13 positioned on the outermost side of the negative electrode sheets 13 constituting the stacked body 15 in the stacking direction of the stacked body 15.

  The electrode body 11 is accommodated in the case body 21 through the opening 21 a of the case body 21. The current collecting group 12d of the positive electrode sheet 12 and the positive electrode terminal 25 are electrically connected via the current collecting terminal 19a, and the current collecting group 13d and the negative electrode terminal 26 of the negative electrode sheet 13 are connected to the current collecting terminal 19b. Is electrically connected. And the secondary battery 10 is comprised by the opening part 21a of the case main body 21 being closed by the lid | cover 28 and sealing.

Next, the operation of this embodiment will be described.
As shown in FIG. 3, a plurality of secondary batteries 10 are arranged in parallel to constitute a battery module M. In each secondary battery 10, the positive terminal 25 and the negative terminal 26 provided in each secondary battery 10 protrude in the same direction, and the lid 28 contacts the bottom wall 22 of the adjacent secondary battery 10. As shown in FIG. Here, when the secondary batteries 10 are arranged side by side, in order to improve the charge / discharge efficiency of the electrode body 11, the thickness direction of the case 20, that is, the electrode with respect to the case 20 of each secondary battery 10. A restraining load is applied in the stacking direction of the bodies 11.

  In the present embodiment, the end E of the separator 14 is disposed on the outer side in the surface direction of the stacked body 15. That is, the end E of the separator 14 does not exist on the surfaces of the positive electrode sheet 12 and the negative electrode sheet 13. As a result, the electrode body 11 is sandwiched between the bottom wall 22 of the case body 21 and the lid 28, and the entire surfaces of the extended portions 14 a of the respective positive electrode sheets 12, the respective negative electrode sheets 13, and the separators 14 are uniformly adhered. The reaction between each positive electrode sheet 12 and each negative electrode sheet 13 becomes uniform. Thereby, the charging / discharging efficiency of the laminated body 15 (electrode body 11) improves, and the running performance of the vehicle carrying the secondary battery 10 of this embodiment improves.

  In addition, the separator 14 is wound around the outer periphery of the laminated body 15 over one turn. For this reason, each positive electrode sheet 12 is restrained in each positive electrode accommodating part 141 and each negative electrode sheet 13 is restrained in each negative electrode accommodating part 142 by the squeezing force with respect to the laminated body 15 by the separator 14. As a result, the positional deviation after lamination in the positive electrode sheet 12 and the negative electrode sheet 13 is suppressed.

In the above embodiment, the following effects can be obtained.
(1) The separator 14 is rubbed over the outer periphery of the laminate 15 over one round, and the first portion 151, the second portion 152, the third portion 153, and the fourth portion 154 of the laminate 15. Was surrounded by a separator 14. Therefore, each positive electrode sheet 12 and each negative electrode sheet 13 can be restrained by the squeezing force of the separator 14 on the laminated body 15, and the positional deviation after lamination in each positive electrode sheet 12 and each negative electrode sheet 13 is suppressed. Can do. In addition, since the terminal E of the separator 14 is disposed outside the first portion 151 of the stacked body 15, the stacked body 15 is stacked with respect to the stacked body 15 in order to improve the charge / discharge efficiency of the stacked body 15. Even if a restraining load is applied in the direction, stress does not concentrate as in the prior art. Therefore, the whole surface of each positive electrode sheet 12 and each negative electrode sheet 13 can be made to adhere uniformly. As a result, the reaction between each positive electrode sheet 12 and each negative electrode sheet 13 becomes uniform, and the charge / discharge efficiency of the laminate 15 can be improved.

  (2) The starting end S of the separator 14 is disposed on the first portion 151 side of the stacked body 15. Therefore, compared with the case where the start end S of the separator 14 is disposed on the third portion 153 side or the fourth portion 154 side of the stacked body 15, When a restraining load is applied to the body 15 in the stacking direction of the stacked body 15, the entire surfaces of each positive electrode sheet 12 and each negative electrode sheet 13 can be easily adhered uniformly.

  (3) The starting end S of the separator 14 is positioned outside the negative electrode sheet 13 positioned on the outermost side of the negative electrode sheets 13 constituting the stacked body 15 in the stacking direction of the stacked body 15. Therefore, compared with the case where the starting end S of the separator 14 is positioned on the inner side of the negative electrode sheet 13 positioned on the outermost side of the negative electrode sheets 13 constituting the stacked body 15 in the stacking direction of the stacked body 15, The separator 14 can be shortened as much as possible, and the separator 14 can be easily rubbed along the outer periphery of the laminate 15 over one turn.

  (4) The separator 14 was formed in a zigzag shape, and the separator 14 formed a plurality of positive electrode accommodating portions 141 for accommodating the positive electrode sheet 12 and a plurality of negative electrode accommodating portions 142 for accommodating the negative electrode sheet 13. Therefore, the labor of laminating the separator 14 one by one between the positive electrode sheet 12 and the negative electrode sheet 13 can be saved. Moreover, the separator 14 was made to function as a brazing member. Therefore, the manufacturing process can be simplified as compared with the case where the brazing member and the separator 14 are separate.

  (5) The terminal E of the separator 14 was fixed to the portion along the stacking direction of the stacked body 15 in the extending portion 14 b of the separator 14 with the adhesive tape 30. Therefore, it is possible to strengthen the punching of the separator 14 with respect to the stacked body 15.

  (6) Since the end E of the separator 14 is fixed to the portion along the stacking direction of the laminate 15 in the extending portion 14b of the separator 14 by the adhesive tape 30, the end E of the separator 14 moves in the case 20. Can be prevented.

  (7) According to the present embodiment, it is possible to prevent the secondary battery 10 from being defective because the positive electrode sheet 12 and the negative electrode sheet 13 are displaced after being stacked. Moreover, since the charge / discharge efficiency of the laminated body 15 is improved, the energy density of the secondary battery 10 can be increased.

  (8) According to the present embodiment, the positive electrode sheet 12 and the negative electrode sheet 13 are misaligned after being stacked, thereby suppressing a problem in running performance of the vehicle on which the secondary battery 10 is mounted. be able to. Moreover, since the charging / discharging efficiency of the laminated body 15 improves, the running performance of the vehicle carrying the secondary battery 10 can be improved.

In addition, you may change the said embodiment as follows.
In the embodiment, the separator 14 is formed by being folded back in a zigzag shape. In this case, the starting end S of the separator 14 is located inside the negative electrode sheet 13 in the stacking direction of the stacked body 15.

  In the embodiment, for example, the end E of the separator 14 may be welded (fixed) to a portion along the stacking direction of the stacked body 15 in the extending portion 14b of the separator 14 by welding (for example, ultrasonic welding). According to this, it is not necessary to use a fixing member for fixing the end E of the separator 14 to a portion along the stacking direction of the stacked body 15 in the extending portion 14b of the separator 14, and the number of parts can be reduced. .

In embodiment, the terminal E of the separator 14 does not need to be fixed to the site | part along the lamination direction of the laminated body 15 in the extension part 14b of the separator 14. FIG.
In the embodiment, the starting end S of the separator 14 may be disposed on the third portion 153 side or the fourth portion 154 side of the stacked body 15.

  In the embodiment, the starting edge S of the separator 14 is positioned on the outer side in the surface direction of the positive electrode sheet 12 and the negative electrode sheet 13, but the present invention is not limited thereto, and the starting edge S of the separator 14 is not between the positive electrode sheet 12 and the negative electrode sheet 13. In the surface direction, it may be located outside the positive electrode sheet 12 and inside the negative electrode sheet 13.

In the embodiment, the separator 14 may be configured such that the portion formed in a zigzag shape and the extending portion 14b are divided.
In the embodiment, a member different from the separator 14 may be separately provided as a brazing member. In this case, it is preferable that the brazing member is an insulating member having a strip shape (long sheet shape) and is continuous with the separator 14. In this case, the separator 14 may not be formed in a zigzag shape, and a sheet-like separator may be interposed between the positive electrode sheet 12 and the negative electrode sheet 13 one by one.

In the embodiment, the number of the extending portions 14b of the separator 14 is not particularly limited as long as it is one turn or more.
In the embodiment, the end E of the separator 14 may be disposed outside the second portion 152 of the stacked body 15.

In the embodiment, the starting end S of the separator 14 may be disposed on the second portion 152 side of the stacked body 15.
In the embodiment, the sheet-like positive electrode sheet 12 and the negative electrode sheet 13 are used as the positive electrode and the negative electrode. However, the present invention is not limited thereto, and for example, a plate-like positive electrode and negative electrode having a predetermined amount of thickness may be used.

The present invention has been embodied in the vehicle secondary battery 10, but is not limited thereto, and may be embodied in a secondary battery other than the vehicle.
The present invention has been embodied in the secondary battery 10, but is not limited thereto, and may be embodied in a power storage device such as an electric double layer capacitor.

  E ... Termination as outer end, S ... Start end as inner end, 10 ... Secondary battery as power storage device, 12 ... Positive electrode sheet as positive electrode, 13 ... Negative electrode sheet as negative electrode, 14 ... Baking member Separator also serving as: 14a ... extended portion, 14e ... folded portion, 141e ... first folded portion, 142e ... second folded portion, 141 ... positive electrode accommodating portion, 142 ... negative electrode accommodating portion, 15 ... laminated body, 151 ... first Part: 152 ... Second part, 153 ... Third part, 154 ... Fourth part, 20 ... Case, 30 ... Adhesive tape as a fixing member.

Claims (8)

A power storage device in which a stacked body in which the positive electrode and the negative electrode are alternately stacked in a state where the positive electrode and the negative electrode are insulated is housed in a case,
The laminated body is located at both ends of the laminated body, and a first part and a second part along the lamination direction of the laminated body,
A third portion and a fourth portion located at both ends of the laminate and along the surface direction of the laminate,
Further comprising a brazing member that is rubbed over the circumference of the laminate over one round;
The brazing member surrounds at least the first part, the second part, the third part, and the fourth part,
An outer end portion of the brazing member that is rubbed against the laminate is disposed on the first part side in the laminate or the second part side in the laminate. Power storage device.   An inner end portion of the brazing member that is rubbed to the laminate is disposed on the first part side in the laminate or the second part side in the laminate. The power storage device according to claim 1.   The inner end portion of the brazing member that is brazed to the laminate is located on the outer side of the outermost negative electrode of the negative electrodes constituting the laminate. Alternatively, the power storage device according to claim 2. A separator that is interposed between the positive electrode and the negative electrode and that insulates between the positive electrode and the negative electrode;
The separator has a zigzag shape in which extended portions extending from one end to the other end in the laminate and folded portions obtained by folding the separator are alternately formed,
A plurality of positive electrode accommodating portions in which the positive electrode is accommodated are formed by a first folded portion located on one end side of the laminated body of the folded portions and two extending portions continuous to the first folded portion. ,
Of the folded portion, the second folded portion located on the other end side opposite to the first folded portion in the stacked body, and the two extending portions continuous to the second folded portion, A plurality of negative electrode accommodating portions for accommodating the negative electrode are formed,
The power storage device according to claim 1, wherein the separator also serves as the brazing member.   The fixing member which fixes the said outer side edge part to the site | part along the lamination direction of the said laminated body in the said brazing member is further provided, The Claim 1 characterized by the above-mentioned. Power storage device.   The power storage device according to any one of claims 1 to 4, wherein the outer end portion is welded to a portion of the brazing member along a stacking direction of the stacked body.   The power storage device according to any one of claims 1 to 6, wherein the power storage device is a secondary battery.   A vehicle on which the power storage device according to any one of claims 1 to 7 is mounted.