JP2014220103A - Power storage module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage module capable of suppressing an imbalance of the center of gravity.SOLUTION: In a power storage module 10 having a plurality of power storage units 23A-23F laminated, each of the plurality of power storage units 23A-23F comprises: a plurality of power storage elements 23 each having a pair of positive electrode terminal 26 and negative electrode terminal 27 protruded from one end part of a flat main body part 25, and arranged in a direction orthogonal to a protrusion direction in an attitude that the protrusion directions of the pair of positive electrode terminal 26 and negative electrode terminal 27 are aligned; and positive electrode bus bars 36A-36F and negative electrode bus bars 37A-37B arranged at positions at a protrusion direction side of the positive electrode terminal 26 and the negative electrode terminal 27 to the plurality of power storage elements 23, and connected with the positive electrode terminal 26 and the negative electrode terminal 27 of the plurality of power storage elements 23. The plurality of power storage units 23A-23F are laminated so that the positive electrode bus bars 36A-36F and the negative electrode bus bars 37A-37B are alternately located at an opposite side with respect to the protrusion direction.

Description

  The present invention relates to a power storage module.

  Conventionally, the thing of patent document 1 is known as an electrical storage module provided with the several electrical storage element. In this power storage module, one side terminal type power storage elements having a structure in which a pair of lead terminals are led out from one side of a flat main body are arranged side by side, and each power storage element is connected in series or in parallel, and further stacked in multiple layers. It has a configuration (see Patent Document 1).

JP2003-151526A

  In the case of using the one-side terminal type power storage element, the terminal connection structure is configured by the bus bar on the terminal lead-out side. For this reason, the outer conductor is unevenly distributed on the terminal side of each power storage element, and the center of gravity is shifted to the terminal side when one layer is viewed in plan.

  If these are stacked in a plurality of layers, the center of gravity of the power storage module as a whole becomes more prominent, which may cause problems in the vibration countermeasures and the fixing structure of the power storage module.

  This invention is completed based on the above situations, Comprising: It aims at providing the electrical storage module with which the shift | offset | difference of the gravity center was suppressed.

  The present invention is a power storage module in which a plurality of power storage units are stacked, and each of the plurality of power storage units includes a pair of lead terminals protruding from one end of a flat main body and the pair of lead terminals A plurality of power storage elements arranged along a direction perpendicular to the protrusion direction in a posture in which the protrusion directions are aligned, and the lead terminals are disposed at positions on the protrusion direction side with respect to the plurality of power storage elements, and Bus bars connected to the lead terminals of a plurality of power storage elements, and the plurality of power storage units are stacked such that the bus bars are alternately positioned on opposite sides in the protruding direction.

  According to the present invention, since the bus bars arranged in each of the stacked power storage units are arranged so as to be alternately positioned on the opposite sides in the protruding direction of the lead terminals, the center of gravity of the power storage module as a whole is offset. Can be suppressed.

  As embodiments of the present invention, the following embodiments are preferable. The bus bar includes an extension portion extending along a side edge in a direction orthogonal to the protruding direction with respect to the power storage element, and the extension portion arranged in each of the plurality of power storage units is orthogonal to the protruding direction. It is preferable to be arranged so as to be located on the opposite side with respect to the direction to be performed.

  According to the above aspect, in each power storage unit, it is possible to suppress the center of gravity from shifting in the direction orthogonal to the protruding direction of the lead terminals, and thus it is possible to further suppress the center of gravity of the power storage module from shifting.

  The bus bar may be laminated via an insulating layer.

  According to the above aspect, even when the center of gravity of each power storage unit is offset by stacking the bus bars, it is possible to suppress the center of gravity of the power storage module from being offset as a whole.

  The power storage element may be a laminate type battery.

  According to the above aspect, even when the center of gravity of the power storage unit is biased toward the bus bar by using a relatively light-weight laminated battery as the power storage element, the center of gravity of the power storage module is prevented from being offset as a whole. Can do.

  ADVANTAGE OF THE INVENTION According to this invention, it can suppress that the gravity center of an electrical storage module offsets.

The perspective view which shows the electrical storage module which concerns on Embodiment 1 of this invention. Perspective view showing the laminate The perspective view which shows the 1st electrical storage unit of the lowest layer of a laminated body. The perspective view which shows an electrical storage element Top view showing heat sink The perspective view which shows the electrical storage element of the 1st electrical storage unit, a positive electrode bus bar, and a negative electrode bus bar. Sectional drawing which cut | disconnected the 1st electrical storage unit by the YZ plane The perspective view which shows the positive electrode bus bar of a 1st electrical storage unit. The perspective view which shows the negative electrode bus bar of a 2nd electrical storage unit. Plan view showing the center separator The top view which shows the left end part side separator of the lowest layer The top view which shows the right end part side separator of the lowest layer The perspective view which shows the state which laminated | stacked the 2nd electrical storage unit on the 1st electrical storage unit. The top view which shows the state which laminated | stacked the 2nd electrical storage unit on the 1st electrical storage unit The perspective view which shows the electrical storage element of the 2nd electrical storage unit, a positive electrode bus bar, and a negative electrode bus bar. AA line sectional view of FIG. The exploded perspective view which shows the laminated structure of a 1st electrical storage unit and a 2nd electrical storage unit Sectional drawing which cut | disconnected the laminated body by YZ plane

<Embodiment 1>
Embodiment 1 of the present invention will be described with reference to FIGS. The power storage module 10 according to the present embodiment is mounted on, for example, a vehicle (not shown) such as an automobile, and used for an integrated starter generator (ISG) of the vehicle. In the following description, the X direction is the right side, the Y direction is the front side, and the Z direction is the top side.

(Power storage module 10)
The power storage module 10 includes a case 11 and a plurality (six in this embodiment) of power storage units 12A, 12B, 12C, 12D, 12E, and 12F housed in the case 11. The plurality of power storage units 12 </ b> A to 12 </ b> F are stacked in the vertical direction to form the stacked body 13.

(Case 11)
As shown in FIG. 1, the case 11 has a bottomed cylindrical main body 14 that opens to the left, and a closing member 15 made of an insulating synthetic resin that closes the opening of the main case 14. Prepare. The case main body 14 includes a metal lower case 16 that opens upward and to the left, and a metal upper case 17 that covers the upper portion of the lower case 16.

  In the four corners of the bottom wall of the lower case 16, fastening holes (not shown) for penetrating the bolts 18 penetrating the laminated body 13 in the vertical direction are formed.

  The upper case 17 has a substantially rectangular shape. In the four corners of the upper case 17, there are formed through holes (not shown) for fastening the lower case 16, the laminate 13, and the upper case 17 together with bolts 18 and nuts 19. .

  The closing member 15 has a substantially rectangular shape, and is fitted into the opening of the case 11 so as to close the opening.

(Laminated body 13)
As shown in FIG. 2, the stacked body 13 is formed by stacking a plurality of power storage units 12 </ b> A to 12 </ b> F vertically. A pair of external connection terminals 22 protrudes leftward from the left end of the stacked body 13. The external connection terminal 22 is led out to the left through the closing member 15 in a state where the laminated body 13 is accommodated in the case 11. One of the pair of external connection terminals 22 is a positive electrode, and the other is a negative electrode. The power storage units 12A to 12F are, in order from the bottom, a first power storage unit 12A, a second power storage unit 12B, a third power storage unit 12C, a fourth power storage unit 12D, a fifth power storage unit 12E, and a sixth power storage unit 12F. .

(Electric storage units 12A-12F)
The power storage units 12 </ b> A to 12 </ b> F include a plurality (three in the present embodiment) of power storage elements 23 and a heat sink 24 that is in thermal contact with the plurality of power storage elements 23. In the following description, the configuration of the power storage units 12A to 12F will be described by taking the first power storage unit 12A in the lowest layer and the second power storage unit 12B in the second layer from the bottom as an example.

(Storage element 23)
As shown in FIG. 3, three power storage elements 23 are arranged in the left-right direction in the first power storage unit 12A. The plurality of power storage elements 23 have the same shape and size. The electricity storage device 23 according to the present embodiment is a laminate type battery. Each power storage element 23 has a substantially rectangular shape when viewed from above, and includes a main body 25 to which side edges of a pair of laminated films stacked one above the other are welded. A power storage element (not shown) is accommodated in the main body 25.

  As shown in FIG. 4, a positive terminal 26 (an example of a lead terminal) that has a flat tab shape and is electrically connected to a power storage element from one of the pair of short sides of the main body 25. And the negative electrode terminal 27 (an example of a lead terminal) protrudes outward. The positive electrode terminal 26 and the negative electrode terminal 27 are led out to the outside of the main body from between the upper and lower laminate films in a state of being superimposed on the upper surface of the lower laminate film.

  In the first power storage unit 12A, the three power storage elements 23 have a posture in which the protruding directions of the positive electrode terminal 26 and the negative electrode terminal 27 are aligned in the front-rear direction (the direction along the Y axis), and the positive electrode terminal 26 and the negative electrode terminal 27 are arranged side by side along the left-right direction (direction along the X-axis) perpendicular to the protruding direction of 27.

  The lower surface of the main body portion 25 has a flat shape and comes into thermal contact with the heat sink 24. On the pair of long sides of the main body 25, both side edges are bent upward.

  The laminate film constituting the main body 25 has a resin layer (not shown) containing polyethylene terephthalate, nylon or the like laminated on the outside of a metal foil containing aluminum foil or the like, and the inside of the metal foil (storage element side) Is provided with a heat welding layer (not shown) containing polyethylene or polypropylene.

(Heat sink 24)
As shown in FIG. 5, the heat sink 24 has a plate shape, and has a substantially rectangular shape when viewed from above. The heat sink 24 is made of a material having a relatively high thermal conductivity. As a material constituting the heat sink 24, any material such as aluminum, aluminum alloy, copper, copper alloy, stainless steel, ceramic, or the like can be used as necessary. In this embodiment, aluminum or an aluminum alloy is used.

  An insulating coating (not shown) is formed on the surface of the heat sink 24. The insulating coating according to the present embodiment is an alumite layer formed on the surface of the heat sink 24 by a known alumite treatment. As the insulating coating, for example, a coating made of a synthetic resin may be used, and an arbitrary insulating coating can be formed by a known method as necessary.

  The heat sink 24 is provided with a fixing portion 29 to which the plurality of power storage elements 23 are fixed side by side in the left-right direction. The electricity storage element 23 and the fixing portion 29 are fixed with a double-sided tape (not shown). Thereby, the electrical storage element 23 and the heat sink 24 come into thermal contact.

  As shown in FIG. 5, the heat sink 24 extends forward from the front end edge of the fixing portion 29 and is bent downward twice from the fixing portion 29 at a right angle so that it has a crank shape as viewed from the left and right directions. Thus, a retracting portion 31 is provided to avoid interference with the positive electrode terminal 26 and the negative electrode terminal 27 of the power storage element 23. In the retreat unit 31, the positive electrode terminal 26 and the negative electrode terminal 27 are disposed at positions corresponding to the positive electrode terminal 26 and the negative electrode terminal 27 in a state where the power storage element 23 is fixed to the fixing unit 29. A plurality of welding window portions 32A into which jigs for welding are inserted are opened.

  As shown in FIG. 5, the heat sink 24 is provided with an extending portion 33 extending rearward from the rear end edge of the fixing portion 29. The extending portion 33 is formed in a crank shape when viewed from the left-right direction by being bent at a right angle twice twice downward from the fixed portion 29. The extending portion 33 and the above-described retracting portion 31 are set to have substantially the same height position in the vertical direction (see FIG. 7).

  As shown in FIG. 5, a plurality of heat transfer portions 34 projecting outward are formed on the front edge and the rear edge of the heat sink 24. The tip of the heat transfer section 34 is bent upward. The heat transfer section 34 protrudes toward the case 11 and elastically contacts the inner surface of the case 11 in a state where the laminated body 13 is accommodated in the case 11. As a result, the heat transfer section 34 and the case 11 come into heat transfer contact. The heat transfer section 34 is arranged on the front edge and the rear edge of the heat sink 24 side by side in the left-right direction. In the present embodiment, four heat transfer portions 34 are provided at each of the front edge and the rear edge of the heat sink 24.

(Positive electrode bus bars 36A to 36F, negative electrode bus bars 37A to 37F)
As shown in FIG. 6, a positive electrode bus bar 36 </ b> A is connected to each positive electrode terminal 26 of a plurality (three in the present embodiment) of storage elements 23, and each negative electrode terminal 27 of the plurality of storage elements 23 is connected to each negative electrode terminal 27. A negative electrode bus bar 37A is connected. Thus, a parallel circuit in which the plurality of power storage elements 23 are connected in parallel is configured by the positive electrode bus bar 36A, the plurality of power storage elements 23, and the negative electrode bus bar 37A. The positive bus bar 36A and the negative bus bar 37A are formed by pressing a metal plate into a predetermined shape. As a metal which comprises said metal plate material, arbitrary metals, such as copper, a copper alloy, aluminum, an aluminum alloy, can be selected as needed. The metal constituting the positive electrode bus bar 36A and the metal constituting the negative electrode bus bar 37A may be the same or different. In the present embodiment, both the positive electrode bus bar 36A and the negative electrode bus bar 37A are made of copper or a copper alloy.

  In addition, positive electrode bus bars 36A to 36F and negative electrode bus bars 37A to 37F are arranged in the first power storage unit 12A to the sixth power storage unit 12F, respectively.

  As shown in FIG. 7, the negative electrode bus bar 37 </ b> A (negative electrode bus bar main body 43) is overlaid on the retracting portion 31 of the heat sink 24 via a central separator 38 made of an insulating synthetic resin. On the negative electrode bus bar 37A, a positive electrode bus bar 36A (positive electrode bus bar main body 42) is overlaid through an insulating sheet 39A (corresponding to an insulating layer) made of an insulating synthetic resin material. An insulating sheet 39B made of an insulating synthetic resin material is further stacked on the positive bus bar 36A.

  As shown in FIG. 8, the positive electrode bus bar 36 </ b> A includes a plurality of positive electrode bus bar main body portions 42 and a plurality of positive electrode bus bar main body portions 42 branched from the positive electrode bus bar main body portion 42 and connected to the positive electrode terminals 26 of the plurality of power storage elements 23 by a known method. (In this embodiment, three) positive electrode branching portions 40 and first terminal portions 41 extending from the positive electrode bus bar main body portion 42 and connected to an external circuit are provided. In the first power storage unit 12A, the first terminal portion 41 is one (positive electrode) of the pair of external connection terminals 22 described above.

  The positive electrode branching portion 40 is bent in a crank shape slightly downward from the positive electrode bus bar main body portion 42. As a result, the vertical height of the positive electrode terminal 26 of the power storage element 23 and the positive electrode branching portion 40 are matched.

  As shown in FIG. 9, the negative electrode bus bar 37 </ b> A includes a negative electrode bus bar main body portion 43, a negative electrode bus bar extension portion 57 (an example of an extension portion) that extends at a right angle from an end portion of the negative electrode bus bar main body portion 43, and a negative electrode bus bar main body portion. A plurality of (three in this embodiment) negative electrode branch portions 44 branched from 43 and connected to the negative electrode terminals 27 of the plurality of power storage elements 23 by a known technique such as welding, and the negative electrode bus bar extension portion 57. And a second terminal portion 45 connected to an external circuit. In the first power storage unit 12A, the second terminal portion 45 is electrically connected to the second power storage unit 12B stacked on the first power storage unit 12A.

(Separators 38, 46A, 46B)
As shown in FIG. 3, the first power storage unit 12 </ b> A includes a central separator 38 disposed on the heat sink 24 and end separators 46 disposed on the left and right sides of the heat sink 24.

  As shown in FIG. 10, the central separator 38 includes a plurality of (three in the present embodiment) partition portions 47 that are partitioned into rectangles in order to hold each power storage element 23 fitted inside. Each partition 47 is set so that the outer shape of the power storage element 23 is substantially the same or slightly larger, and it is possible to fit the power storage elements 23 side by side. By inserting the electricity storage element 23 into the partition portion 47, the plurality of electricity storage elements 23 arranged in the left-right direction are arranged with a space therebetween.

  A bus bar holding portion 48 on which the positive bus bar 36A and the negative bus bar 37A are placed is formed in front of the partition portion 47. The bus bar holding portion 48 is formed with a plurality of welding window portions 32B for inserting welding jigs at positions corresponding to the welding window portions 32A of the heat sink 24 with the central separator 38 attached to the heat sink 24. Has been.

  The central separator 38 is formed with a lock portion 51 </ b> C that protrudes toward the heat sink 24. The central separator 38 and the heat sink 24 are assembled together by the lock portion 51C being elastically locked to the lock receiving portion 50C formed on the heat sink 24.

  As shown in FIG. 2, the center separator 38 is formed with a cover 49 that is elongated in the left-right direction and covers the positive electrode terminal 26 and the negative electrode terminal 27 of the power storage element 23 from above.

  The end separator 46 includes a left end separator 46 </ b> A attached to the left of the heat sink 24 and a right end separator 46 </ b> B attached to the right of the heat sink 24.

  As shown in FIG. 11, the left end separator 46 </ b> A is formed with an elastically deformable lock portion 51 </ b> A that engages with a lock receiving portion 50 </ b> A formed on the heat sink 24. When the lock portion 51A is elastically locked to the lock receiving portion 50A, the left end separator 46A and the heat sink 24 are assembled together. Further, the left end separator 46A is formed with a pin 52A protruding upward, and the pin 52A passes through a through hole 53A formed in the center separator 38, whereby the left end separator 46A and the center separator 38 are assembled together. The positive electrode bus bar 36 </ b> A is placed across the left end separator 46 </ b> A and the central separator 38.

  As shown in FIG. 12, the right end separator 46 </ b> B is formed with an elastically deformable lock portion 51 </ b> B that engages with a lock receiving portion 50 </ b> B formed on the heat sink 24. When the lock portion 51B is elastically locked to the lock receiving portion 50B, the right end separator 46B and the heat sink 24 are assembled together. Further, a pin 52B protruding upward is formed in the right end separator 46B, and the pin 52B passes through a through hole 53B formed in the center separator 38, whereby the right end separator 46B and the center separator 38 are assembled together. The negative electrode bus bar 37 </ b> A is placed over the right end separator 46 </ b> B and the central separator 38.

  The positive electrode bus bar main body part 42 and the negative electrode bus bar main body part 43 are arranged along the edge on the side from which the positive electrode terminal 26 and the negative electrode terminal 27 protrude out of the edge of the electricity storage element 23. In addition, the negative electrode bus bar extension 57 is arranged along the edge on the direction side orthogonal to the protruding direction of the positive electrode terminal 26 and the negative electrode terminal 27 among the edges of the electricity storage element 23.

(Second power storage unit 12B)
Then, the 2nd electrical storage unit 12B distribute | arranged to the 2nd layer from the bottom is demonstrated. In addition, description is abbreviate | omitted about the structure similar to 12 A of 1st electrical storage units.

  As shown in FIGS. 13 and 14, the second power storage unit 12B is stacked on the first power storage unit 12A. At this time, the protruding direction of the positive electrode terminal 26 and the negative electrode terminal 27 of the power storage element 23 arranged in the second power storage unit 12B is the same as that of the positive electrode terminal 26 and the negative electrode terminal 27 of the power storage element 23 arranged in the first power storage unit 12A. It faces the opposite side of the direction. Thereby, the positive electrode bus bar main body part 42 and the negative electrode bus bar main body part 43 of the second power storage unit 12B are connected to the positive electrode bus bar main body part 42 and the negative electrode bus bar main body part 43 of the power storage element 23 arranged in the first power storage unit 12A. 26 and the negative electrode terminal 27 are arranged on the opposite side in the protruding direction.

  As shown in FIG. 15, the positive electrode branch portion 40 of the positive electrode bus bar 36 </ b> B is connected to the positive electrode terminal 26 of the energy storage device 23. The positive electrode bus bar 36 </ b> B arranged in the second power storage unit 12 </ b> B includes a positive electrode bus bar extension 56 (an example of an extension) that extends at a right angle from the end of the positive electrode bus bar main body 42.

  Further, the negative electrode branch portion 44 of the negative electrode bus bar 37 </ b> B is connected to the negative electrode terminal 27 of the electric storage element 23.

  In the second power storage unit 12B, among the edges of the power storage element 23, along the edge on the side (left-right direction) orthogonal to the protruding direction of the positive terminal 26 and the negative terminal 27, the positive bus bar extension 56, A negative electrode bus bar extension 57 is disposed on the opposite side.

  As shown in FIG. 16, the second terminal portion 45 of the negative electrode bus bar 37A disposed in the first power storage unit 12A and the positive electrode bus bar 36B of the second power storage unit 12B overlaid on the first power storage unit 12A are: They are electrically connected by a connecting member 55 formed by pressing a metal plate material into a crank shape. The connecting member 55 is connected to the positive electrode bus bar 36B and the negative electrode bus bar 37A of different layers by a known method such as ultrasonic welding, laser welding, brazing, or soldering. Thereby, the parallel circuit including the plurality of storage elements 23 of the first storage unit 12A and the parallel circuit including the plurality of storage elements 23 of the second storage unit 12B are connected in series. Similarly, the parallel circuit of the first power storage unit 12A to the parallel circuit of the sixth power storage unit 12F are connected in series.

(Laminated structure)
As shown in FIG. 2, each power storage unit 12 </ b> A to 12 </ b> F is formed with a lock claw 54 that is elastically locked to the other power storage units 12 </ b> A to 12 </ b> F stacked one above the other. The lock claws 54 are elastically locked to the other power storage units 12A to 12F, so that the power storage units 12A to 12F are held in a stacked state.

  FIG. 17 shows an exploded perspective view of the first power storage unit 12A and the second power storage unit 12B from below. The positive electrode bus bar 36A and the negative electrode bus bar 37A of the first power storage unit 12A are arranged near the front end of the first power storage unit 12A. On the other hand, the positive electrode bus bar 36B and the negative electrode bus bar 37B of the second power storage unit 12B are arranged near the rear end of the second power storage unit 12B. Thus, the positive electrode bus bar 36A and the negative electrode bus bar 37A of the first power storage unit 12A and the positive electrode bus bar 36B and the negative electrode bus bar 37B of the second power storage unit 12B are in the protruding direction of the positive electrode terminal 26 and the negative electrode terminal 27 of the power storage element 23 ( It is arranged so as to be alternately positioned on the opposite side in the front-rear direction).

  FIG. 18 shows a cross-sectional view of the laminate cut along the XZ plane. As described above, the positive electrode bus bar 36A and the negative electrode bus bar 37A of the first power storage unit 12A and the positive electrode bus bar 36B and the negative electrode bus bar 37B of the second power storage unit 12B are the protruding directions of the positive electrode terminal 26 and the negative electrode terminal 27 of the power storage element 23. It is arranged so as to be alternately located on the opposite side in the (front-rear direction).

  In the stacked body 13 in which the first power storage unit 12 </ b> A to the sixth power storage unit 12 </ b> F are stacked, the positive electrode bus bars 36 </ b> A to 36 </ b> F and the negative electrode bus bars 37 </ b> A to 37 </ b> F arranged in the power storage units 12 </ b> A to 12 </ It arrange | positions so that it may be located in the opposite side alternately about the protrusion direction (front-back direction) of the terminal 26 and the negative electrode terminal 27. FIG.

(Operation and effect of this embodiment)
Then, the effect | action and effect of this embodiment are demonstrated. The present embodiment is a power storage module 10 in which a plurality of power storage units 23 </ b> A to 23 </ b> F are stacked, and each of the plurality of power storage units 23 </ b> A to 23 </ b> F is a pair of positive terminals protruding from one end of a flat main body 25. 26 and a negative electrode terminal 27, and a plurality of power storage elements 23 arranged in a direction orthogonal to the protruding direction in a posture in which the protruding directions of the pair of positive electrode terminals 26 and negative electrode terminals 27 are aligned, On the other hand, the positive electrode bus bars 36 </ b> A to 36 </ b> F and the negative electrode bus bars 37 </ b> A to 37 </ b> A connected to the positive electrode terminals 26 of the plurality of power storage elements 23 and the negative electrode bus bars 37 </ b> A to 37 </ b> A are arranged. 37F, and the plurality of power storage units 12A to 12F include the positive electrode bus bar main body 42 and the negative electrode bus bar 3 of the positive electrode bus bars 36A to 36F. It is stacked so as to be positioned on the opposite side alternately for projecting direction of A~37F the negative bus bar main body portion 43 is a positive electrode terminal 26 and negative terminal 27.

  When the positive electrode bus bars 36A to 36F and the negative electrode bus bars 37A to 37F are connected to the one-side terminal type power storage element 23 from which the positive electrode terminal 26 and the negative electrode terminal 27 protrude from one end of the main body 25, the centers of gravity of the respective power storage units 23A to 23F are shifted. There is concern. When the power storage units 23A to 23F are stacked in a state where the center of gravity of each of the power storage units 23A to 23F is shifted, there is a concern that the center of gravity of the power storage module 10 is shifted.

  According to the present embodiment, the positive electrode bus bar main body portion 42 of the positive electrode bus bars 36A to 36F and the negative electrode bus bar main body portion 43 of the negative electrode bus bars 37A to 37F arranged in each of the stacked power storage units 23A to 23F are the positive electrode terminal 26 and the negative electrode. Since it arrange | positions so that it may be located in the opposite side alternately about the protrusion direction of the terminal 27, it can suppress that the gravity center of the electrical storage module 10 deviates as a whole. As a result, it is possible to suppress the occurrence of problems in the vibration countermeasures and the fixing structure of the power storage module 10.

  Further, the positive electrode bus bars 36A to 36F and the negative electrode bus bars 37A to 37F respectively include a positive electrode bus bar extension portion 56 and a negative electrode bus bar extension portion 57 that extend along side edges in a direction orthogonal to the protruding direction with respect to the storage element 23. The positive electrode bus bar extension 56 and the negative electrode bus bar extension 57 arranged in each of the plurality of power storage units 12A to 12F are arranged so as to be located on the opposite side in the direction orthogonal to the protruding direction of the positive electrode terminal 26 and the negative electrode terminal 27. ing.

  Thereby, in each electrical storage unit 12A-12F, since it can suppress that a gravity center offsets about the direction orthogonal to the protrusion direction of the positive electrode terminal 26 and the negative electrode terminal 27, it further suppresses that the gravity center of the electrical storage module 10 offset. be able to.

  Furthermore, the positive electrode bus bar main body portion 42 of the positive electrode bus bars 36A to 36F and the negative electrode bus bar main body portion 43 of the negative electrode bus bars 37A to 37F are laminated via an insulating sheet 39A. Thereby, even when the center of gravity of each power storage unit 12A to 12F is offset by stacking the positive electrode bus bars 36A to 36F and the negative electrode bus bars 37A to 37F, the center of gravity of the power storage module 10 is prevented from being offset as a whole. Can do.

  The power storage device 23 according to the present embodiment is a laminate type battery. Even when the center of gravity of the power storage units 23A to 23F is shifted to the positive bus bars 36A to 36F and the negative bus bars 37A to 37F by using a comparatively lightweight laminated battery as the power storage element 23, the center of gravity of the power storage module 10 as a whole. Can be suppressed.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.

  (1) Although the power storage element 23 according to the present embodiment is a laminate type battery, the power storage element 23 may be a battery in which a power storage element is housed in a metal casing. In addition, the storage element 23 may have any shape such as a cylindrical shape, a rectangular tube shape, a button shape, or the like. Further, the power storage element 23 may have a configuration in which a flat surface is formed in a part of the outer shape and the flat surface and the heat sink 24 are brought into contact with each other.

  (2) Although the positive electrode bus bars 36A to 36F and the negative electrode bus bars 37A to 37F arranged in the power storage units 23A to 23F are stacked, the present invention is not limited thereto, and the positive electrode bus bars 36A to 36F and the negative electrode bus bars 36A to 36F are It does not have to be laminated.

  (3) In the present embodiment, three power storage elements 23 are connected in parallel to one power storage unit, but two or four or more power storage elements 23 are connected in parallel to one power storage unit. It may be configured to be connected

  (4) In the present embodiment, the case 11 is configured to accommodate six power storage units. However, the present invention is not limited to this, and two to five, or seven or more power storage units are included in the case 11. It is good also as a structure accommodated.

  (5) In the present embodiment, a battery is used as the power storage element 23. However, the present invention is not limited to this, and any power storage element 23 such as a capacitor or a capacitor may be used as necessary.

  (6) The power storage module 10 according to the present embodiment is for ISG, but is not limited thereto, and may be configured to be used for other purposes such as a power source of an electric vehicle or a hybrid vehicle.

  (7) The insulating layer according to the present embodiment is the insulating sheet 39A made of a synthetic resin, but is not limited thereto, and a coating made of an insulating synthetic resin may be formed on the bus bar. Alternatively, an insulating plate made of an insulating synthetic resin may be used.

10: Power storage module 12A, 12B, 12C, 12D, 12E, 12F: Power storage unit 23: Power storage element 25: Body portion 26: Positive electrode terminal (lead terminal)
27: Negative terminal (lead terminal)
36A, 36B, 36C, 36D, 36E, 36F: positive electrode bus bar (bus bar)
37A, 37B, 37C, 37D, 37E, 37F: negative electrode bus bar (bus bar)
39A: Insulating sheet (insulating layer)
56: Positive bus bar extension (extension)
57: Negative electrode bus bar extension (extension)

Claims (4)

A power storage module in which a plurality of power storage units are stacked,
Each of the plurality of power storage units includes a pair of lead terminals projecting from one end of a flat main body, and along a direction orthogonal to the projecting direction in a posture in which the projecting directions of the pair of lead terminals are aligned. A plurality of power storage elements arranged, and a bus bar arranged at a position on the protruding direction side of the lead terminals with respect to the plurality of power storage elements and connected to the lead terminals of the plurality of power storage elements,
The plurality of power storage units are stacked such that the bus bars are alternately positioned on opposite sides in the protruding direction. The bus bar includes an extension extending along a side edge in a direction orthogonal to the protruding direction with respect to the power storage element,
The power storage module according to claim 1, wherein the extension portion disposed in each of the plurality of power storage units is disposed on the opposite side in a direction orthogonal to the protruding direction.   The power storage module according to claim 1, wherein the bus bar is stacked via an insulating layer.   The power storage module according to claim 1, wherein the power storage element is a laminate type battery.

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