JP6315119B2 - Battery pack - Google Patents

Description

  The present invention relates to a battery pack in which battery cells are stacked.

  Examples of the battery pack having the battery modules stacked and arranged in the vertical direction include a secondary battery device described in Patent Document 1. The secondary battery device described in Patent Document 1 includes a plurality of battery stack assemblies. The battery stack assembly includes a floor plate, a back plate erected from the floor plate, and a base plate fixed on the floor plate. A battery module is placed on the base plate. The battery module is in contact with the back plate. A side plate is erected on the edge of the base plate so as to sandwich the battery module. A base plate is provided on the battery module via a packing, and the battery modules are stacked on the base plate by placing the battery modules on the base plate.

JP 2011-54353 A

  By the way, when the battery modules are stacked, the load of the battery module positioned in the vertical direction is applied to the battery module positioned in the vertical direction. For this reason, when vibration is applied to the battery module, the battery module located downward in the vertical direction has a greater impact and is more likely to be damaged.

  The objective of this invention is providing the battery pack which can suppress the failure | damage of the battery cell laminated | stacked and arrange | positioned.

  A battery pack that solves the above problem includes a plurality of battery cells stacked in a vertical direction, and a buffer member provided between the battery cells adjacent in the vertical direction. At least three are laminated | stacked, and the said buffer member makes it a summary that the dimension of a perpendicular direction is so large that the thing located below in the said perpendicular direction.

  According to this, since the battery cells are stacked, the load of the battery cell located in the upper vertical direction is applied to the battery cell located in the lower vertical direction, and the vertical downward is applied when vibration is applied to the battery cell. The battery cell located at is more susceptible to damage by impact. About the buffer member provided between the battery cells adjacent in the vertical direction, the impact applied to the battery cell located below can be mitigated by increasing the size in the vertical direction as the object located downward in the vertical direction. The damage of the battery cell can be suppressed.

  In the battery pack, it is preferable that at least three battery modules having a plurality of battery cells are stacked in the vertical direction, and the buffer member is in contact with the battery modules adjacent in the vertical direction. According to this, the shock applied to the plurality of battery cells of the battery module can be reduced by the buffer member coming into contact with the battery modules adjacent in the vertical direction. Therefore, damage to the battery cell can be suppressed.

  The battery pack preferably includes a plurality of battery holders for holding the plurality of battery cells, and the buffer member is in contact with a battery holder adjacent in the vertical direction. According to this, the load of the battery cell can be received by the battery holder. Moreover, the shock applied to the battery cell can be alleviated by contacting the buffer member with the battery holder adjacent in the vertical direction. Therefore, damage to the battery cell can be suppressed.

  About the said battery pack, it is preferable that the said battery holder bends the location which contacts the battery holder adjacent to a perpendicular direction, and used the said location to make the said buffer member. According to this, it is not necessary to provide another member as the buffer member, and a part of the battery holder can be used as the buffer member to prevent the battery cell from being damaged.

  About the said battery pack, it is preferable that the said battery holder at least one part including the location which contacts the battery holder adjacent to a perpendicular direction is formed with an elastic member, and said part was made into the said buffer member. According to this, it is not necessary to provide another member as the buffer member, and a part of the battery holder can be used as the buffer member to prevent the battery cell from being damaged.

  About the said battery pack, it is preferable that the said buffer member is provided between the said battery holders adjacent to a perpendicular direction. According to this, the impact applied to the battery cell can be reduced by the buffer member provided between the battery holders. Therefore, damage to the battery cell can be suppressed.

  In the battery pack, the battery holder includes a rectangular flat plate-like first covering portion and a rectangular flat plate-like second portion extending from both longitudinal ends of the first covering portion in the thickness direction of the first covering portion. A longitudinal direction of the second covering portion and the third covering portion is a thickness direction of the first covering portion, and the second covering portion and the third covering portion. The first end portion in the longitudinal direction of the third covering portion is provided with a rectangular flat plate-like support portion extending in the longitudinal direction, and the support portion is preferably the buffer member. According to this, it is not necessary to provide a separate member as the buffer member, and the support portion of the battery holder can be used as the buffer member to prevent the battery cell from being damaged.

  About the said battery pack, it is preferable that the said buffer member is provided between all the battery modules adjacent to a perpendicular direction. According to this, the damage of a battery cell can be suppressed between all the battery modules which adjoin a perpendicular direction.

  About the said battery pack, it is preferable that the said buffer member is provided between the one part battery modules adjacent to a perpendicular direction. According to this, damage of a battery cell can be suppressed between some battery modules adjacent to a perpendicular direction.

  According to the present invention, it is possible to suppress damage to the stacked battery cells.

The schematic side view which shows the forklift of embodiment. The perspective view which shows the battery pack of embodiment. Sectional drawing which shows the battery pack of embodiment. The perspective view which shows the battery module of embodiment. The perspective view which shows the relationship between the battery holder of embodiment, a square battery, and a heat-transfer plate. (A) And (b) is an effect | action figure of the battery pack of embodiment.

  Hereinafter, an embodiment in which the battery pack is embodied as a battery pack mounted on a forklift will be described. In the following description, “front”, “rear”, “left”, “right”, “upper”, and “lower” are “front”, “rear”, and “left” when the forklift driver is facing the front of the forklift. ”,“ Right ”,“ upper ”, and“ lower ”.

  As shown in FIG. 1, drive wheels 12 are provided at the front lower part of a vehicle body 11 of a forklift 10 as an industrial vehicle, and steering wheels 13 are provided at a rear lower part of the vehicle body 11. In addition, a cargo handling device is provided at the front portion of the vehicle body 11. The mast 14 constituting the cargo handling apparatus is erected on the front portion of the vehicle body 11, and the mast 14 is provided with a pair of left and right forks 16 via a lift bracket 15. The fork 16 is lifted and lowered together with the lift bracket 15 by driving a lift cylinder 17 connected to the mast 14. Further, the fork 16 is tilted together with the mast 14 by driving a tilt cylinder 18 connected to the mast 14. A load 19 is mounted on the fork 16. The vehicle body 11 is equipped with a traveling motor M1 as a drive source for the drive wheels 12 and a cargo handling motor M2 as a drive source for the fork 16.

  A cab 20 is provided in the center of the vehicle body 11. The cab 20 is provided with a driving seat 21 on which an operator (driver) can sit. A handle 22 is provided in front of the driving seat 21. A battery pack 30 is mounted below the cab 20. Hereinafter, the battery pack 30 will be described in detail.

  As shown in FIGS. 2 and 3, the battery pack 30 is accommodated in a case 31. The case 31 includes a counterweight 32 for balancing with the load 19 mounted on the fork 16. The counterweight 32 is erected in the thickness direction of the weight portion 33 from the short-side end 33a of the weight portion 33 and the weight portion 33 having a rectangular parallelepiped shape, and from the longitudinal direction one end 33c of the weight portion 33 to the other longitudinal end. The weight main body 34 has a rectangular plate shape extending over 33d. In other words, the weight portion 33 is erected from the proximal end of the weight body 34 in the thickness direction of the weight body 34. In the present embodiment, the weight main body 34 is erected in the vertical direction and functions as an erected member. At the distal end of the weight body 34 (the end opposite to the base end of the weight body 34), a notch 35 is formed by cutting the weight body 34 in the thickness direction of the weight body 34. A plurality of bolt holes 39 as fastening holes extending in the thickness direction of the weight body 34 are provided on the surface of the weight body 34 on the side where the weight portion 33 is erected. A female screw is formed on the inner peripheral surface of the bolt hole 39. Since the weight main body 34 is erected in the vertical direction, the thickness direction of the weight main body 34 is a direction intersecting with the vertical direction (in this embodiment, the direction perpendicular to the vertical direction and the longitudinal direction of the weight main body 34), and the bolt The hole 39 extends in a direction intersecting with the vertical direction and opens on a surface intersecting with the vertical direction (surface in the thickness direction of the weight main body 34).

  An inverted U-shaped frame 40 that is provided apart from the weight main body 34 is erected from the weight portion 33 at the other short end 33 b of the weight portion 33. The frame 40 includes a first column portion 41 and a second column portion 42 erected from two corners of the edge portion of the other end 33 b in the short direction on the upper surface of the weight portion 33, and the first column portion 41. And a base 43 that connects the upper end of the second column 42 (the end opposite to the end joined to the weight 33). That is, the case 31 has a front opening 30 a surrounded by the weight portion 33 and the frame 40 on the other end 33 b side of the weight portion 33. In the case 31, the front opening 30a is closed by a lid member 44 having a rectangular plate shape.

  The length in the standing direction of each column portion 41, 42 (the length in the longitudinal direction of each column portion 41, 42) is the same as the shortest length from the upper surface of the weight portion 33 to the distal end surface of the weight main body 34. A top plate 45 is supported on the upper surface of the frame 40 and the upper surface of the weight main body 34. The top plate 45 closes an opening (not shown) between the weight main body 34 and the frame 40. Further, the case 31 has a weight main body 34, a weight portion 33, a first pillar portion 41, and a one end side opening 30 b surrounded by a top plate 45 on the longitudinal end 33 c side of the weight portion 33. Further, the case 31 has an opening 30c on the other end side surrounded by the weight main body 34, the weight portion 33, the second column portion 42, and the top plate 45 on the other end 33d side of the weight portion 33 in the longitudinal direction. Have. The one end side opening 30 b is closed by the one end side lid member 46, and the other end side opening 30 c is closed by the other end side lid member 47. A case 31 is formed by the counterweight 32, the frame 40, the top plate 45, and the lid members 44, 46, and 47, respectively.

  One surface in the thickness direction of the weight body 34 (the inner surface of the case 31) is an installation surface 34a on which the battery modules 51, 52, and 53 are installed. Two sets of battery rows in which three battery modules 51, 52, 53 are arranged in the short direction of the weight body 34 are provided on the installation surface 34 a in the longitudinal direction of the weight body 34. A mounting plate 36 having a rectangular flat plate shape is fixed to the notch 35. On the mounting plate 36, a housing case 37 for housing a control device that controls the battery modules 51, 52, and 53 and a junction box 38 for housing a relay, wiring, and the like are disposed.

  As shown in FIGS. 4 and 5, the battery modules 51, 52, and 53 include a prismatic battery 55 (for example, a secondary battery such as a lithium ion secondary battery or a nickel hydride storage battery) that is a resin cell. The battery holders 70 are juxtaposed with each other, and a metal (for example, aluminum) heat transfer plate 80 is interposed between the adjacent rectangular batteries 55. In the battery modules 51, 52, and 53, end plates 57 are provided at both ends of the prismatic battery 55 in the parallel direction.

  The bolt B1 is inserted into one end plate 57, and the bolt B1 is screwed to the nut N on the other end plate 57 side. A bracket 90 as an installation member is fixed to each end plate 57. The battery modules 51, 52, and 53 are installed in the weight body 34 by fixing the bracket 90 to the weight body 34. In the present embodiment, the bracket 90 is fixed to the end plate 57 so as to be indirectly joined to the square batteries 55 at both ends in the direction in which the square batteries 55 are arranged side by side.

  As shown in FIG. 5, the battery holder 70 has a rectangular flat plate-shaped first covering portion 73. At both ends in the longitudinal direction of the first covering portion 73, a rectangular flat plate-like second covering portion 74 and a third covering portion 75 extending in the thickness direction of the first covering portion 73 are provided. A first longitudinal end portion 74 a of the second covering portion 74 (an end portion opposite to an end portion on which the first covering portion 73 is provided) and a longitudinal first end portion 75 a of the third covering portion 75. A rectangular flat plate-like fourth extending between the first end portions 74b and 75b in the short direction of the respective covering portions 74 and 75 is provided on the end portion on the side opposite to the end portion where the first covering portion 73 is provided. The covering portion 76 is provided. The thickness direction of the fourth covering portion 76 coincides with the short direction of the covering portions 74 and 75, and the longitudinal direction thereof coincides with the opposing direction of the second covering portion 74 and the third covering portion 75. The direction perpendicular to the thickness direction and the longitudinal direction of the fourth covering portion 76 is the short direction of the fourth covering portion 76.

  Further, terminals that are U-shaped and open in the thickness direction of the fourth covering portion 76 on one end face in the short direction of the fourth covering portion 76 at both longitudinal ends of the fourth covering portion 76. Each accommodating portion 78 is provided, and each terminal accommodating portion 78 is connected to each of the covering portions 74 and 75. In each terminal accommodating portion 78, a wall member 78 a protrudes from the surface opposite to the surface joined to the fourth covering portion 76.

  On one end face in the short direction of the fourth covering portion 76, a quadrangular columnar column member 79 is adjacent to each terminal accommodating portion 78 and the axis of the column member 79 extends in the short direction of the covering portions 74 and 75. It is provided as follows. The column member 79 is provided with an insertion hole 79 a through which the bolt B <b> 1 is inserted, penetrating in the axial direction of the column member 79.

  A rectangular flat plate extending in the longitudinal direction of each of the covering portions 74, 75 at the first end portions 74 a, 75 a in the longitudinal direction of the second covering portion 74 and the third covering portion 75. A support 77 having a shape is provided.

  At the second end portions 74c and 75c in the longitudinal direction of the second covering portion 74 and the third covering portion 75, a square pillar-shaped leg portion 72 has an axis of the leg portion 72 extending in the short direction of the covering portions 74 and 75. It is provided as follows. The leg portion 72 is provided with an insertion hole 72a through which the bolt B1 is inserted, penetrating in the axial direction of the leg portion 72.

The heat transfer plate 80 includes a rectangular plate-shaped plate body 81 and a heat radiating portion 82 extending from the first longitudinal end portion 81 a of the plate body 81 in the thickness direction of the plate body 81.
As shown in FIG. 4, a placement plate 54 is placed on the battery holder 70. Specifically, the placement plate 54 is inserted between the support portions 77 and placed on the wall member 78a. A relay cover 61 is placed on the placement plate 54. Inside the relay cover 61, a relay 62 that switches between energization and interruption of energization of each of the battery modules 51, 52, and 53 is provided. An ECU cover 63 is placed on the placement plate 54. An ECU 64 that controls each of the battery modules 51, 52, 53 is provided inside the ECU cover 63.

  The bracket 90 is formed by bending the center in the short direction of one rectangular flat plate material at a right angle. Accordingly, the bracket 90 includes a plate fixing portion 91 having a rectangular flat plate shape and a weight fixing portion 92 having a rectangular flat plate shape. A bolt B <b> 2 is inserted into the plate fixing portion 91, and the bolt B <b> 2 is screwed to the end plate 57, whereby the bracket 90 is fixed to the end plate 57. The weight fixing portion 92 is provided with a through hole 93 through which the bolt B <b> 3 as a fastening member is inserted so as to penetrate in the thickness direction of the weight fixing portion 92. The diameter of the through-hole 93 is such that the diameter of the weight fixing portion 92 in the longitudinal direction is larger than the diameter of the weight fixing portion 92 in the short direction. That is, the through hole 93 is an elliptical long hole extending in the longitudinal direction of the weight fixing portion 92.

  As shown in FIG. 3, the through hole 93 of the bracket 90 is provided to face the bolt hole 39 of the weight main body 34. Then, the bolt B3 inserted from the through hole 93 is screwed into a female screw formed on the inner peripheral surface of the bolt hole 39, whereby the bracket 90 is fixed to the weight main body 34, whereby the battery modules 51, 52, 53 is installed on the weight main body 34.

  A buffer member 100 is provided between the battery modules 51, 52, and 53. Specifically, the buffer member 100 includes a support portion 77 of the battery holder 70 of the battery modules 51 and 52 that are positioned below the vertical direction among the battery modules 51, 52, and 53 adjacent in the vertical direction (stacking direction). The battery modules 52 and 53 are located between the leg portions 72 of the battery holders 70 of the battery modules 52 and 53 that are positioned upward in the vertical direction. In the present embodiment, the buffer member 100 is provided between all battery holders 70 adjacent in the vertical direction. And the buffer member 100 is provided between the square batteries 55 which each battery holder 70 hold | maintains by providing the buffer member 100 between the battery holders 70 adjacent to a perpendicular direction. That is, the buffer member 100 is provided between the square batteries 55 adjacent in the vertical direction. The buffer member 100 is an elastic member that can be elastically deformed. For example, ethylene propylene rubber (EPDM) is used. The buffer member 100 is elastically deformed by a load in the vertical direction, and tries to return to its original shape when released from the load in the vertical direction.

Next, the operation of the battery pack 30 of this embodiment will be described.
When vibration is applied to the battery pack 30 as the forklift 10 travels, impact is applied to the battery modules 51, 52, 53. In particular, the impact of the battery modules 51, 52, 53 positioned downward in the vertical direction increases due to the load of the battery modules 51, 52, 53 positioned upward in the vertical direction.

  By providing the buffer member 100 between the battery modules 51, 52, 53 arranged in a stacked manner, the impact applied to the battery modules 51, 52, 53 can be mitigated. In particular, when the battery modules 51, 52, and 53 are stacked as described above, the impact is more likely to be applied to the battery modules 51, 52, and 53 below in the vertical direction due to the influence of gravity. For this reason, by providing the buffer member 100 in the stacked arrangement structure, the effect is particularly exerted as compared with the case where the buffer member 100 is provided between the battery modules 51, 52, 53 arranged in the horizontal direction.

  As shown in FIG. 6A, when the battery modules 51, 52, 53 are stacked when the battery modules 51, 52, 53 are assembled, manufacturing errors such as the prismatic battery 55, the battery holder 70, etc. The through hole 93 of the bracket 90 and the bolt hole 39 of the weight main body may not be able to face each other due to an error during assembly. Even if this error occurs, the through hole 93 has an elliptical shape so that the through hole 93 of the bracket 90 and the bolt hole 39 of the weight body are opposed to each other. However, if the battery modules 51, 52, 53 are stacked, the vertical direction In the upper battery modules 51, 52, and 53, errors are accumulated, and the bolt holes 39 of the weight main body 34 may not be opposed to each other even with the elliptical through holes 93. In such a case, the bolt B3 cannot be screwed into the bolt hole 39, and the battery modules 51, 52, 53 cannot be fixed to the weight body 34.

  As shown in FIG. 6B, when a load directed downward in the vertical direction is applied to each of the battery modules 51, 52, 53, the buffer member 100 is deformed (crushed in the vertical direction). Then, by deforming the buffer member 100, the battery modules 51, 52, and 53 can be shifted downward in the vertical direction by the amount of deformation. Note that the size (vertical dimension) of the buffer member 100 is determined by predicting an error that occurs when manufacturing the rectangular battery 55 and the battery holder 70 and an error that occurs when the battery modules 51, 52, and 53 are assembled. It is set to a size that can absorb the error.

Therefore, according to the above embodiment, the following effects can be obtained.
(1) A buffer member 100 is provided between the battery modules 51, 52, and 53 arranged in a stacked manner. For this reason, even when vibration is applied to the battery pack 30 and an impact is applied to the battery modules 51, 52, and 53, the shock can be reduced by the buffer member 100. Therefore, it is possible to prevent damage to the battery modules 51, 52, 53 arranged in a stacked manner, and consequently the square batteries 55 of the battery modules 51, 52, 53.

  (2) The buffer member 100 is an elastic member that can be elastically deformed. For this reason, when assembling the battery modules 51, 52, and 53, a load is applied to the battery modules 51, 52, 53 downward in the vertical direction to deform the buffer member 100, and the battery module 51 is deformed by the deformation amount of the buffer member 100. , 52, 53 can be shifted downward in the vertical direction. For this reason, even if the error is accumulated, the through hole 93 of the bracket 90 and the bolt hole 39 of the weight main body 34 are easily opposed to each other, and the battery modules 51, 52, 53 can be prevented from being fixed to the weight main body 34.

(3) Since the buffer member 100 is an elastic member, the buffer member 100 is easily deformed, and vibrations applied to the battery modules 51, 52, and 53 are easily absorbed.
(4) Since the counterweight 32 is also used as the standing member, the number of parts can be reduced as compared with the case where the standing member and the counterweight 32 are provided separately.

  (5) The battery module 52 is stacked on the battery module 51 via the buffer member 100 provided between the battery holder 70 of the battery module 51 and the battery holder 70 of the battery module 52. The battery module 52 is placed on the battery module 52 via a buffer member 100 provided between the battery holder 70 of the battery module 52 and the battery holder 70 of the battery module 53. Therefore, the load of the stacked battery modules 51, 52, 53 is applied to the battery holder 70 and the buffer member 100. For this reason, it can suppress that a load is added to the square battery 55, and can further suppress that the square battery 55 is damaged.

In addition, you may change the said embodiment as follows.
In the embodiment, the bracket 90 is provided with a convex portion (for example, a bolt or a protrusion), and this convex portion is fitted into a fastening hole (for example, a concave portion or a through hole) provided in the weight main body 34. Thus, the battery modules 51, 52, 53 (square battery 55) may be installed on the weight body 34. Further, the weight main body 34 may be provided with a protruding portion (for example, a bolt or a protruding portion) protruding in a direction intersecting the vertical direction, and the bracket 90 may be provided with a fastening hole. In this case, the battery module 51, 52, 53 (square battery 55) is installed in the weight body 34 by fitting the convex portion of the weight body 34 into the fastening hole of the bracket 90. When the convex portion or the fastening hole of the bracket 90 and the fastening hole or the convex portion of the weight body 34 do not face each other, the convex portion or the fastening hole of the bracket 90 is elastically deformed as in the embodiment. And the fastening hole or convex part of the weight main body 34 can be made to oppose. The fastening hole may be penetrated in the thickness direction of the weight main body 34 or may not be penetrated.

  In the embodiment, the buffer member 100 may be provided directly between the square batteries 55 adjacent in the stacking direction without providing the battery holder 70. Further, the buffer member 100 may be provided between the end plates 57 adjacent in the vertical direction.

In the embodiment, the battery holder 70 may be formed of an elastic member such as rubber so that a part or the whole of the battery holder 70 may be a buffer member.
In the embodiment, the support portion 77 may be used as a buffer member by bending the support portion 77 so that the support portion 77 is easily bent.

In the embodiment, the buffer member 100 may be other than an elastic member as long as it can be deformed by applying a load.
In the embodiment, the buffer member 100 may be a spring.

In the embodiment, a bolt other than the bolt B3 may be used as the fastening member. For example, a screw or a shaft member press-fitted into the bolt hole 39 may be used.
In the embodiment, the standing member may be a side wall of the case.

In the embodiment, the number of stacked battery modules may be changed as long as it is two or more.
In the embodiment, a cylindrical battery or a laminated battery may be used as the battery cell.

In the embodiment, the through hole 93 of the bracket 90 may have a shape other than an ellipse. For example, a perfect circle or a square hole may be used.
In the embodiment, the bracket 90 may be directly joined to the square battery 55. For example, the prismatic battery 55 may be attached with an adhesive, or may be directly bolted to the prismatic battery 55.

In the embodiment, the bolt hole 39 may be penetrated in the thickness direction of the weight main body 34.
In embodiment, the bolt hole 39 should just extend in the direction which cross | intersects a perpendicular direction.

  In the embodiment, the buffer member 100 is provided between all the battery holders 70 adjacent in the vertical direction, but the buffer member 100 is only between some battery holders 70 among the battery holders 70 adjacent in the vertical direction. May be provided. For example, in each battery module 51, 52, 53, the buffer member 100 may be provided only between the battery holders 70 provided at both ends of the prismatic battery 55 in the parallel direction.

  In the embodiment, the size of the buffer member 100 below the vertical direction may be increased. Since the load applied to the battery modules 51, 52, and 53 in the lower vertical direction becomes larger, by providing the buffer member 100 proportional to the load, the battery modules 51, 52, and 53 in the lower vertical direction can be appropriately protected. it can.

  ○ The industrial vehicle may be a power shovel.

  B3 ... bolt, 10 ... forklift, 30 ... battery pack, 32 ... counter weight, 34 ... weight body, 39 ... bolt hole, 55 ... square battery, 70 ... battery holder, 90 ... bracket, 93 ... through hole, 100 ... Buffer member.

Claims (9)

A plurality of battery cells stacked in a vertical direction;
A buffer member provided between the battery cells adjacent in the vertical direction,
At least three of the battery cells are stacked in the vertical direction,
The battery pack according to claim 1, wherein the buffer member has a larger vertical dimension as an object positioned downward in the vertical direction. At least three battery modules having a plurality of battery cells are stacked in the vertical direction,
The battery pack according to claim 1, wherein the buffer member is in contact with the battery modules adjacent in the vertical direction. A plurality of battery holders for holding a plurality of the battery cells;
The battery pack according to claim 1, wherein the buffer member is in contact with a battery holder adjacent in the vertical direction.   4. The battery pack according to claim 3, wherein the battery holder is bent at a portion in contact with a battery holder adjacent in the vertical direction, and the contact portion is used as the buffer member. The battery holder is formed of an elastic member at least partially including a portion that contacts a battery holder adjacent in the vertical direction,
The battery pack according to claim 3, wherein the part is the buffer member.   The battery pack according to claim 3, wherein the buffer member is provided between the battery holders adjacent in the vertical direction. The battery holder includes a rectangular flat plate-like first covering portion, a rectangular flat plate-like second covering portion extending in the thickness direction of the first covering portion from both longitudinal ends of the first covering portion, and a third covering portion. And a covering portion of
The longitudinal direction of the second covering portion and the third covering portion is the thickness direction of the first covering portion,
A rectangular flat plate-like support portion extending in the longitudinal direction is provided at the first end portion in the longitudinal direction of the second covering portion and the third covering portion,
The battery pack according to claim 4 or 5 , wherein the support portion is the buffer member.   The said buffer member is a battery pack as described in any one of Claims 2-7 provided between all the battery modules adjacent to a perpendicular direction.   The battery pack according to any one of claims 2 to 7, wherein the buffer member is provided between some battery modules adjacent in the vertical direction.