JP2015230765A - Battery module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery module that can reduce deviation of a constraint load applied to a battery cell.SOLUTION: A battery module 10 is mounted in a housing 71, and has a battery body 11. The battery body 11 is pinched by end plates 21, 22 provided at both the sides in a juxtaposition direction of battery cells 12. The battery module 10 has deformation suppressing members 41, 42 fixed to the first end plate 21 and the second end plate 22. The respective deformation suppressing members 41, 42 are bridged between the respective end plates 21, 22 so as to contain a second end portion 26 in the longitudinal direction of a pinching portion 23.

Description

  The present invention relates to a battery module having a plurality of battery cells arranged in parallel.

  The electrode of the secondary battery repeats expansion and contraction with charge / discharge. When the expansion and contraction of the electrodes are repeated, the distance between the electrodes increases, or the resistance value of the secondary battery increases due to distortion of the electrodes.

  In Patent Document 1, a plurality of battery cells (battery elements) are provided side by side. The plurality of battery cells have a positive electrode, a negative electrode, and a separator provided between the positive electrode and the negative electrode. The plurality of battery cells are sandwiched between end plates (resins), and the end plates apply pressure from the positive electrode or the negative electrode to the separator so as to suppress expansion of the battery cells. Thereby, it is suppressed that the space | interval of a positive electrode and a negative electrode becomes large, or a positive electrode and a negative electrode are distorted.

JP 2013-26090 A

  By the way, if the restraint load applied to the battery cell is biased, for example, the restraint load from the end plate is concentrated on a part of the battery cell, in the case of a lithium ion battery, it causes deterioration of the battery cell such as lithium deposition. It is desired to reduce the bias of the restraining load applied to the battery cell.

  The objective of this invention is providing the battery module which can make small the bias | bias of the restraint load added to a battery cell.

  A battery module that solves the above problems includes a battery body having a plurality of battery cells arranged side by side, a first end plate and a second end plate that sandwich the battery body from both sides in the direction in which the battery cells are juxtaposed, A battery module comprising: a restraining member that applies a restraining load that restrains the plurality of battery cells with respect to the first end plate and the second end plate, wherein the first end plate and the second end plate The end plate has a fixed end fixed to the fixed member and a non-fixed end that is provided on the opposite side of the fixed end and is not fixed to the fixed member. The first end plate and the first plate The two end plates include the non-fixed end and are laid across the battery body on the first end plate and the second end plate, and the battery cells are arranged side by side. A deformation suppressing member that suppresses separation between the non-fixed end of the first end plate and the non-fixed end of the second end plate due to expansion in a direction, and the deformation suppressing member is arranged in parallel with the battery cells. It is separated from the battery body in a direction orthogonal to the installation direction.

  According to this, when the battery cell expands, a load is applied to each end plate. At this time, the fixed end of each end plate is fixed to the fixed member, while the non-fixed end is not fixed to the fixed member, so that the non-fixed ends of the end plates are separated from each other. Try to transform. When each end plate is deformed, the variation in the restraining load on the battery cell is increased, but the deformation suppressing member suppresses deformation so that the non-fixed ends are separated from each other. Restraint load on battery cells is not biased.

  About the said battery module, the said deformation | transformation suppression member has the 1st member provided along with the parallel arrangement direction of the said battery cell, and a 2nd member, The said 1st member is the parallel arrangement direction of the said battery cell. And the second member has a second extending portion extending in the direction in which the battery cells are juxtaposed, and the first extending portion and the second extending portion are The overlapping member has a overlapping portion that can adjust the length in the juxtaposition direction of the deformation suppressing members, and the first member and the second member are fixed at the overlapping portion by a fixing tool. preferable.

  According to this, the dimension of a deformation | transformation suppression member can be adjusted according to the length between each end plate. For this reason, even if the dimension between each end plate differs due to a manufacturing error of each member, the deformation suppressing member can be fixed to each end plate.

  In the battery module, the restraining member is a bolt inserted through the first end plate and the second end plate, and a nut screwed into the bolt, and the deformation suppressing member is formed by the bolt and the nut. It is preferable to be fixed to the first end plate and the second end plate.

  According to this, a bolt and a nut can be used also as a member for fixing a restraint member and a deformation | transformation suppression member to each end plate. Therefore, it is not necessary to separately provide a member for fixing the deformation suppressing member to each end plate, and an increase in the number of parts can be suppressed.

  According to the present invention, the bias of the restraining load applied to the battery cell can be reduced.

The perspective view which shows the state in which the battery module of embodiment was accommodated in the housing | casing. Sectional drawing which shows the state in which the battery module of embodiment was accommodated in the housing | casing. The perspective view which shows the deformation | transformation suppression member of embodiment. The perspective view which shows the deformation | transformation suppression member of embodiment. The perspective view when the battery module of embodiment is accommodated in a case main body.

Hereinafter, an embodiment of the battery module will be described.
As shown in FIG.1 and FIG.2, the battery module 10 is accommodated in the housing | casing 71 as a to-be-fixed member. The casing 71 includes a bottomed cylindrical case main body 72 and a lid 73 that closes the opening 72 a of the case main body 72. The battery module 10 has a battery body 11. The battery body 11 of the present embodiment includes a plurality of battery cells 12 arranged in parallel and a battery holder 13 that holds each battery cell 12 individually. The battery cell 12 is a secondary battery such as a lithium ion battery, for example. The battery cell 12 has an electrode assembly 15 inside the case 14. The electrode assembly 15 has a separator interposed between positive and negative electrodes.

  The battery body 11 is sandwiched between end plates 21 and 22 provided on both sides of the battery cell 12 in the direction in which the battery cells 12 are arranged side by side. The end plates 21 and 22 of the present embodiment are obtained by bending a plate material, and a plate-like sandwiching portion 23 that sandwiches the battery cell 12 and a plate-like module for fixing the battery module 10 to the casing 71. And a fixing portion 24. In the present embodiment, the sandwiching portion 23 has a rectangular shape, and the module fixing portion 24 extends from the first longitudinal end portion 25 of the sandwiching portion 23 in the thickness direction of the sandwiching portion 23.

  A first insertion part 29 that protrudes in the short direction is provided at the first end part 27 in the short direction of the holding part 23. In the present embodiment, two first insertion portions 29 are provided at intervals in the longitudinal direction of the sandwiching portion 23. The first insertion part 29 is provided near the center of the holding part 23 in the longitudinal direction. A second insertion portion 30 that protrudes in the short direction is provided at the second end portion 28 in the short direction of the holding portion 23. In the present embodiment, two second insertion portions 30 are provided at intervals in the longitudinal direction of the sandwiching portion 23. The second insertion part 30 is provided near both longitudinal ends of the holding part 23. In the following description, for convenience of explanation, the end plate 21 will be described as the first end plate 21, and the end plate 22 will be described as the second end plate 22.

  The battery module 10 includes a plurality of (two in this embodiment) deformation suppressing members 41 and 42 fixed to the first end plate 21 and the second end plate 22. Of the two deformation suppressing members 41, 42, the deformation suppressing member 41 is described as a first deformation suppressing member 41, and the deformation suppressing member 42 is described as a second deformation suppressing member 42.

  As shown in FIGS. 3 and 4, the first deformation suppressing member 41 is U-shaped as a whole. The first deformation suppressing member 41 includes a first member 51 and a second member 61 that are both L-shaped. The first member 51 includes a plate-like first fixing portion 52 and a plate-like first extending portion 53 that extends from the first fixing portion 52 in the thickness direction of the first fixing portion 52. ing. The first fixing portion 52 is provided with a first insertion hole 54 that penetrates in the thickness direction. The first fixing portion 52 and the first extending portion 53 are both rectangular, and the first extending portion 53 is extended from the longitudinal end portion of the first fixing portion 52.

  Protruding portions 55 that protrude in the thickness direction of the first extending portion 53 are provided at both ends of the first extending portion 53 in the short direction. Each projecting portion 55 extends over the entire longitudinal direction of the first extending portion 53. Accordingly, a groove 56 is defined in a region surrounded by the first extending portion 53 and each protruding portion 55. The first extending portion 53 is provided with a long hole 57 that penetrates in the thickness direction. The long hole 57 extends in the extending direction of the first extending portion 53 in the longitudinal direction, and is provided at a plurality of locations (two in this embodiment) along the short direction of the first extending portion 53. Yes. In addition, a first recess 58 is provided at the protruding end from the first extending portion 53 that is the tip of each protruding portion 55.

  The second member 61 includes a plate-like second fixing portion 62 and a plate-like second extending portion 63 that extends from the second fixing portion 62 in the thickness direction of the second fixing portion 62. ing. The second fixing portion 62 is provided with a second insertion hole 64 that penetrates in the thickness direction. In the present embodiment, the second fixing portion 62 and the second extending portion 63 are both rectangular, and the second extending portion 63 is extended from the end portion in the longitudinal direction of the second fixing portion 62. .

  The second extending portion 63 is set to a dimension that can be inserted into the groove portion 56. In the present embodiment, the dimension in the short direction of the second extending part 63 is slightly smaller than the dimension between the projecting parts 55 of the first member 51, that is, the dimension between the opposing inner surfaces of the projecting parts 55. The second extending portion 63 is provided with screw holes 65 at a plurality of locations (two locations in the present embodiment) aligned in the lateral direction. Of the surface in the thickness direction of the second extending portion 63, a second recessed portion 66 extending over the entire lateral direction is provided on the surface on the second fixing portion 62 side.

  When the dimension in the extending direction of the first extending portion 53 and the dimension in the extending direction of the second extending portion 63 are matched, the inner surfaces of the first end plate 21 and the second end plate 22 facing each other Is longer than the dimension between the opposite outer surfaces.

  The first deformation suppressing member 41 is configured in a U shape by inserting the second extending portion 63 of the second member 61 into the groove portion 56 of the first member 51. The second member 61 overlaps the first member 51 by the amount inserted into the groove portion 56 of the first member 51. Therefore, a portion of the first member 51 that overlaps the second member 61 inserted into the groove portion 56 becomes the first overlapping portion 59 of the first member 51. Further, in the second member 61, the portion inserted into the groove portion 56 of the first member 51 becomes the second overlapping portion 69 of the second member 61. The first member 51 and the second member 61 are configured such that a screw 67 as a fixing tool inserted into each elongated hole 57 is screwed into the screw hole 65, whereby the overlapping portion 59 is pressed by the pressing force of the head of the screw 67. , 69.

  Since the second deformation suppressing member 42 has the same configuration as the first deformation suppressing member 41 except that the dimensions of the first fixing portion 52 and the second fixing portion 62 are different, each of the second deformation suppressing members 42 Parts are denoted by the same reference numerals as those of the first deformation suppressing member 41, and detailed description thereof is omitted. The first fixing portion 52 and the second fixing portion 62 of the second deformation suppressing member 42 have a shorter dimension in the longitudinal direction than the first fixing portion 52 and the second fixing portion 62 of the first deformation suppressing member 41.

  As shown in FIG. 1, the first fixing portions 52 of the deformation suppressing members 41 and 42 are fixed to the first end plate 21. The second fixing portion 62 is fixed to the second end plate 22.

  The first fixing portion 52 of the first deformation suppressing member 41 is provided so as to overlap the first insertion portion 29 on the second end portion 26 side in the longitudinal direction in the first insertion portion 29 of the first end plate 21. The holding portion 23 extends toward the second end portion 26 in the longitudinal direction, and a part of the second projection 26 protrudes from the second end portion 26 in the longitudinal direction. The second fixing portion 62 of the first deformation suppressing member 41 is provided so as to overlap with the first insertion portion 29 on the second end portion 26 side in the longitudinal direction among the first insertion portions 29 of the second end plate 22. A part extends from the second end portion 26 in the longitudinal direction and extends toward the second end portion 26 in the longitudinal direction. In the first deformation suppressing member 41, the bolt B <b> 1 is inserted into the first insertion hole 54 of the first fixing portion 52 toward the second insertion hole 64 of the second fixing portion 62. In the first deformation suppressing member 41, the bolt B <b> 1 inserted through the first insertion hole 54 includes the first fixing portion 52, the first insertion portion 29 of the first end plate 21, each battery holder 13, and the second end plate 22. The first insertion part 29 and the second fixing part 62 are inserted and screwed into the nut N1. As a result, the first deformation suppressing member 41 is stretched across the battery body 11 across the first end plate 21 and the second end plate 22 including the second end portion 26 in the longitudinal direction of each clamping portion 23. That is, the first deformation suppressing member 41 holds the second end portion 26 in the longitudinal direction of the holding portion 23 in each of the end plates 21 and 22.

  The first fixing portion 52 of the second deformation suppressing member 42 is provided so as to overlap with the second insertion portion 30 on the second end portion 26 side in the longitudinal direction among the second insertion portions 30 of the first end plate 21. The holding portion 23 extends toward the second end portion 26 in the longitudinal direction, and a part of the second projection 26 protrudes from the second end portion 26 in the longitudinal direction. The second fixing portion 62 of the second deformation suppressing member 42 is provided so as to overlap with the second insertion portion 30 on the second end portion 26 side in the longitudinal direction among the second insertion portions 30 of the second end plate 22. The holding part 23 extends toward the second end 26 in the longitudinal direction, and a part of the second end 26 protrudes from the second end 26 in the longitudinal direction. In the second deformation suppressing member 42, the bolt B <b> 1 is inserted into the first insertion hole 54 of the first fixing portion 52 toward the second insertion hole 64 of the second fixing portion 62. In the second deformation suppressing member 42, the bolt B <b> 1 inserted through the first insertion hole 54 is connected to the first fixing portion 52, the second insertion portion 30 of the first end plate 21, each battery holder 13, and the second end plate 22. The second insertion portion 30 and the second fixing portion 62 are inserted and screwed into the nut N1. As a result, the second deformation suppressing member 42 is laid across the battery body 11 on the first end plate 21 and the second end plate 22 including the second end portion 26 in the longitudinal direction of each clamping portion 23. That is, the second end portion 26 in the longitudinal direction of the clamping portion 23 in each end plate 21, 22 is clamped by the second deformation suppressing member 42.

  Each deformation suppressing member 41, 42 is provided at the end of the second extending portion 63, with the first fixing portion 52 provided at the end of the first extending portion 53 fixed to the first end plate 21. The second fixing part 62 is fixed to the second end plate 22. Therefore, both end portions of the deformation suppressing members 41 and 42 are fixed to the first end plate 21 and the second end plate 22.

  The first extending portion 53 and the second extending portion 63 of each deformation suppressing member 41, 42 extend in the direction in which the battery cells 12 are juxtaposed. And the 1st extension part 53 and the 2nd extension part 63 are spaced apart from the battery body 11 in the direction orthogonal to the parallel installation direction of the battery cell 12. FIG.

  Among the first insertion portions 29 of the first end plate 21, the first insertion portion 29 on the side of the first end portion 25 in the longitudinal direction has a first end in the longitudinal direction of the first insertion portions 29 of the second end plate 22. The bolt B <b> 1 is inserted toward the first insertion part 29 on the part 25 side. The bolt B <b> 1 is inserted through the first insertion portion 29 of the first end plate 21, each battery holder 13, and the first insertion portion 29 of the second end plate 22, and is screwed into the nut N <b> 1.

  Among the second insertion portions 30 of the first end plate 21, the second insertion portion 30 on the side of the first end portion 25 in the longitudinal direction has a first end in the longitudinal direction of the second insertion portions 30 of the second end plate 22. The bolt B <b> 1 is inserted toward the second insertion part 30 on the part 25 side. The bolt B1 is inserted through the second insertion portion 30 of the first end plate 21, the battery holder 13 and the second insertion portion 30 of the second end plate 22, and is screwed into the nut N1. Each bolt B <b> 1 and each nut N <b> 1 applies a restraining load that restrains the plurality of battery cells 12 to the first end plate 21 and the second end plate 22. For this reason, bolt B1 and nut N1 serve as a restraining member.

  The module fixing part 24 of the end plates 21 and 22 of the battery module 10 is fixed to the wall surface of the casing 71 by fixing bolts B2. Therefore, the fixed end fixed to the fixed member in the end plates 21 and 22 is the first longitudinal end portion 25 of the clamping portion 23 provided with the module fixing portion 24. Further, the second end portion 26 in the longitudinal direction of the sandwiching portion 23 is not fixed to the casing 71 and is a non-fixed end.

Next, the operation of the battery module 10 of the present embodiment will be described.
A film is formed on the electrode of the battery cell 12 with use, and the battery cell 12 expands as the use period becomes longer. When the battery cells 12 expand, the adjacent battery cells 12 are pressed against each other. Then, a force directed to both sides in the juxtaposed direction acts on each battery cell 12. A load from the battery cell 12 is applied to the first end plate 21 and the second end plate 22. When the deformation suppressing members 41 and 42 are not provided, the holding portions 23 of the end plates 21 and 22 have the first end 25 in the longitudinal direction fixed to the casing 71 and the second end 26 in the longitudinal direction. Is not fixed to the casing 71, and tends to be deformed so that the second ends 26 in the longitudinal direction are separated from each other. More specifically, the longitudinal second end portions 26 of the end plates 21 and 22 will be deformed in a direction away from each other with the angle between the sandwiching portion 23 of each end plate 21 and 22 and the module fixing portion 24 as a base point. And

  When the deformation suppressing members 41 and 42 are installed on the end plates 21 and 22 including the second end portion 26 in the longitudinal direction as in the present embodiment, the first end plate 21 and the second end plate 22 In order to deform, it is necessary to deform the first extending portion 53 and the second extending portion 63 so as to extend in the direction in which the battery cells 12 are juxtaposed. For this reason, the load which the 1st end plate 21 and the 2nd end plate 22 deform | transform becomes large compared with the case where each deformation | transformation suppression member 41 and 42 is not provided, and the 1st end plate 21 and the 2nd end plate 22 are. It becomes difficult to deform. Therefore, each deformation suppressing member 41, 42 suppresses the separation between the second end portion 26 in the longitudinal direction of the first end plate 21 and the second end portion 26 in the longitudinal direction of the second end plate 22 due to the expansion of the battery cells 12. doing.

  In addition, the second member 61 of each deformation suppressing member 41, 42 can move in the groove 56 in the extending direction of the first extending portion 53 by loosening the screw 67. For this reason, even if the dimensions between the first end plate 21 and the second end plate 22 differ due to manufacturing errors of the members of the battery module 10, the first extending portion 53 of the first member 51 and the second end plate By adjusting the position of the second extending portion 63 of the member 61, that is, by adjusting the overlapping amount of the first overlapping portion 59 and the second overlapping portion 69, the deformation suppressing members 41 and 42 of the member 61 are adjusted according to the battery module 10. The length can be adjusted.

  As shown in FIG. 5, when the battery module 10 is fixed to the casing 71, first, the opening 72 a of the case main body 72 is directed upward in the vertical direction, and the battery module 10 is inserted into the case main body 72 from the opening 72 a. To accommodate. The battery module 10 is accommodated in the case main body 72 in a state of being hung by the hanger 81. At this time, it is necessary to hang the hanger 81 on the battery module 10, but the first extending portion 53 and the second extending portion 63 of each deformation suppressing member 41, 42 are arranged in parallel with the battery cell 12 from the battery body 11. Since it is provided apart in the direction orthogonal to the installation direction, the hanger 81 can be hooked on each of the deformation suppressing members 41, 42. In addition, the suspension tool 81 can be restrained from being displaced by hooking the suspension tool 81 on the first recess 58 of the first extension part 53 and the second recess 66 of the second extension part 63. After the battery module 10 is accommodated in the case main body 72, the fixing bolt B2 is inserted into the module fixing portion 24 of each of the end plates 21 and 22, and the fixing bolt B2 is screwed into the case main body 72, whereby the battery module 10 is fixed. After the battery module 10 is fixed to the case main body 72, the opening 72 a of the case main body 72 is closed by the lid 73.

Therefore, according to the above embodiment, the following effects can be obtained.
(1) Each deformation suppressing member 41, 42 is constructed including the second end portion 26 in the longitudinal direction of each end plate 21, 22. For this reason, even if the battery cell 12 expands and the end plates 21 and 22 try to deform, the deformation suppressing members 41 and 42 suppress the deformation. For this reason, the restraining load from each end plate 21 and 22 to the battery cell 12 is not easily biased.

  (2) The first extending portion 53 and the second extending portion 63 of each of the deformation suppressing members 41 and 42 are provided apart from the battery body 11 in a direction orthogonal to the direction in which the battery cells 12 are juxtaposed. For this reason, the insulation distance from the battery cell 12 to each deformation | transformation suppression member 41 and 42 can be lengthened. In addition, since there is a gap between the first extension part 53 and the second extension part 63 and the battery body 11, the gap is used to suspend the first extension part 53 and the second extension part 63. The tool 81 can be hooked.

(3) By providing the first recessed portion 58 in the first extending portion 53 and providing the second recessed portion 66 in the second extending portion 63, it is possible to suppress the displacement of the hanger 81.
(4) Each deformation suppressing member 41, 42 has a first member 51 and a second member 61. By adjusting the position of the second extending portion 63 of the first extending portion 53 and the second member 61 of the first member 51, the length of each deformation suppressing member 41, 42 according to the battery module 10, that is, The distance between the opposing surfaces of the first fixing portion 52 and the second fixing portion 62 can be adjusted. Accordingly, it is possible to suppress the formation of a gap between the first fixing portion 52 and the first end plate 21 of each deformation suppressing member 41, 42 or between the second fixing portion 62 and the second end plate 22, and each end. The deformation of the plates 21 and 22 can be appropriately suppressed.

  (5) The bolt B1 and the nut N1 that are applying a restraining load in the direction approaching the end plates 21 and 22 are also used as the bolt B1 and the nut N1 for fixing the deformation suppressing members 41 and 42. For this reason, compared with the case where the member for fixing the deformation | transformation suppression members 41 and 42 is provided separately, reduction of a number of parts is measured.

In addition, you may change embodiment as follows.
O Three or more deformation suppressing members may be provided, or a single member may be provided.
Each deformation suppressing member 41, 42 may be composed of a single member.

  Each deformation suppressing member 41, 42 may be fixed to each end plate 21, 22 with a member different from the bolt B 1 and nut N 1 that applies a load in a direction approaching each end plate 21, 22. For example, it may be fixed with an adhesive or the like, or a bolt not functioning as a restraining member is inserted into the first fixing portion 52 and the second fixing portion 62 and screwed into the end plates 21 and 22. Also good.

  ○ When the hanging tool 81 is not used when the battery module 10 is accommodated in the case main body 72, or when the positional deviation of the hanging tool 81 can be regulated by another member, the first recess 58 and the second recess 66 are It does not have to be provided.

The battery body 11 may be composed of only the battery cells 12. That is, the battery holder 13 that holds the battery cell 12 may not be provided.
The fixed member may be a counterweight mounted on an industrial vehicle.

  Each end plate 21, 22 does not have the module fixing part 24 and may be fixed to the casing 71 by a separate fixing member.

  B1 ... bolt, N1 ... nut, 10 ... battery module, 11 ... battery body, 12 ... battery cell, 21 ... first end plate, 22 ... second end plate, 25 ... longitudinal first end, 26 ... longitudinal direction 2nd end part, 41 ... 1st deformation | transformation suppression member, 42 ... 2nd deformation | transformation suppression member, 51 ... 1st member, 52 ... 1st fixing | fixed part, 56 ... Groove part, 61 ... 2nd member, 62 ... 2nd fixing | fixed part 67 ... Screws, 71 ... Housing.

Claims (3)

A battery body having a plurality of battery cells arranged side by side;
A first end plate and a second end plate for sandwiching the battery body from both sides of the battery cells in the juxtaposition direction;
A restraining member that applies a restraining load that restrains the plurality of battery cells with respect to the first end plate and the second end plate, and a battery module comprising:
The first end plate and the second end plate have a fixed end fixed to a fixed member, and a non-fixed end that is provided on a side opposite to the fixed end and is not fixed to the fixed member. ,
The first end plate and the second end plate include the non-fixed end and are laid across the battery body on the first end plate and the second end plate, and the battery cells are arranged side by side. A deformation suppressing member that suppresses separation between the non-fixed end of the first end plate and the non-fixed end of the second end plate accompanying expansion of the first end plate;
The deformation suppressing member is a battery module that is separated from the battery body in a direction orthogonal to a direction in which the battery cells are arranged side by side. The deformation suppressing member includes a first member provided side by side in the parallel arrangement direction of the battery cells, and a second member,
The first member has a first extending portion that extends in a direction in which the battery cells are juxtaposed,
The second member has a second extending portion that extends in the direction in which the battery cells are juxtaposed,
The first extending portion and the second extending portion have overlapping portions that can overlap each other and adjust the length of the deformation suppressing member in the juxtaposed direction,
The battery module according to claim 1, wherein the first member and the second member are fixed at the polymerization site by a fixture. The restraining member is a bolt inserted through the first end plate and the second end plate, and a nut screwed into the bolt.
The battery module according to claim 1 or 2, wherein the deformation suppressing member is fixed to the first end plate and the second end plate by the bolt and the nut.