JP6247608B2 - Battery pack - Google Patents

Description

  The present invention relates to a battery pack including a case member that houses a plurality of battery modules each including a battery cell.

There are battery packs that house a plurality of battery modules mounted as power sources in electric vehicles such as electric vehicles and hybrid vehicles.
Battery packs are stacked with multiple cases containing battery modules, and cooling members for battery modules such as ducts are stacked, which increases weight and is susceptible to shock and vibration during vehicle travel. Become. For this reason, a structure that can withstand weight, shock and vibration is required.

  There is known a battery pack in which battery modules arranged vertically are connected by a bracket, and the bracket is fastened to a center plate sandwiched between an upper case and a lower case. A plurality of battery modules are also arranged in the horizontal direction, and a bridging portion formed by bending a part of the center plate is interposed between the battery modules (for example, FIG. 7 to FIG. 7 of Patent Document 1). 9).

JP 2013-129391 A

  In the structure of Patent Document 1, since the weight of all battery modules is applied to the center plate, it is necessary to make the center plate a highly rigid member, which increases the weight. In addition, since the bridge portion is formed by bending a part of the center plate, it is necessary to produce the center plate each time in accordance with the size, the number of accommodation, the arrangement, etc. of the battery module, and there is no commonality Therefore, the development period becomes longer, the mold cost increases, and the cost increases.

The battery pack of the present invention includes a lower case having a bottom surface portion on which a plurality of battery modules are disposed, an upper case having a top surface portion, and a lower attachment portion, an upper portion disposed in the lower case. A plurality of mounting portions and a main body portion that connects the lower mounting portion and the upper mounting portion, the lower mounting portion is fixed to the bottom surface portion of the lower case, and the upper mounting portion is fixed to the inner surface of the top surface portion of the upper case An inner plate, a lower surface side attachment portion, an upper surface side attachment portion, and a support portion that connects the lower surface side attachment portion and the upper surface side attachment portion, and the lower surface side attachment portion is one of the plurality of internal plates. One or a plurality of external plates respectively fixed to the outer surface of the top surface portion corresponding to the portion of the top surface portion to which the upper mounting portion is fixed, and a cooling member attached to the top surface portion of the upper case.

  According to the present invention, the weight can be reduced. Further, since the inner plate and the outer plate are shared, the cost can be reduced.

1 is an external perspective view of a battery pack according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of the battery pack illustrated in FIG. 1. The perspective view which shows the internal structure of the control apparatus illustrated by FIG. The top view of the state which removed the upper case of the battery pack illustrated in FIG. FIG. 3 is a schematic diagram of the battery module illustrated in FIG. 2. The state which attached the internal plate to the lower case shown in Drawing 1 is shown, (A) is a perspective view seen from the upper part front, and (B) is a perspective view seen from the upper part back. FIG. 2 is an enlarged cross-sectional view illustrating a fixing structure between an upper case and a lower case and a fixing structure between an upper case and a lower case illustrated in FIG. 1. The external appearance perspective view of Embodiment 2 of the battery pack by this invention. The figure which looked at the battery pack illustrated in FIG. 8 from the side. FIG. 9 is an external perspective view of a duct of the battery pack illustrated in FIG. 8. FIG. 9 is an enlarged cross-sectional view illustrating a fixing structure of each case member of the battery pack illustrated in FIG. 8. The enlarged perspective view which shows the state which assembles | attaches an upper case, an external plate, and a control apparatus.

Embodiment 1
Hereinafter, a battery pack according to an embodiment of the present invention will be described in detail with reference to the drawings.
The battery pack 100 is mounted on an electric vehicle such as an electric vehicle or a hybrid vehicle as a power source for an electric motor, an illumination, a control device, or the like. FIG. 1 is an external perspective view of a battery pack according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view of the battery pack shown in FIG.
The battery pack 100 includes a control device 10, a duct (cooling member) 20, and a module pack 30.
The module pack 30 includes a plurality of battery modules 70 housed in a case member 60 composed of an upper case 40 and a lower case 50. The upper case 40 and the lower case 50 are formed by pressing a metal thin plate.

  The lower case 50 has a rectangular bottom surface portion 51, a pair of side portions 52 formed by erecting side edges in the longitudinal direction of the bottom surface portion 51, and side edges in the short direction of the bottom surface portion 51. It has a pair of formed end portions 53 and is formed in a box shape with an upper portion facing the bottom surface portion 51 being an opening 54. A flange portion 55 bent in the horizontal direction is formed at the upper end of the pair of side portions 52 and one upper end of the pair of end portions 53. Through holes 56 are provided in the bottom surface portion 51, and through holes 57 are provided in each side portion 52 at predetermined intervals along the longitudinal direction. The flange portion 55 is provided with a plurality of through holes 58.

  The upper case 40 has a rectangular top surface portion 41, a pair of side portions 42 formed by erecting the side edges in the longitudinal direction of the top surface portion 41, and the side edges in the short direction of the top surface portion 41. It has a pair of formed end portions 43 and is formed in a box shape in which a lower portion facing the top surface portion 41 is an opening (not shown). The opening of the upper case 40 has substantially the same shape and size as the opening 54 of the lower case 50. A flange portion 45 bent in the horizontal direction is formed at the lower end of the pair of side portions 42 of the upper case 40 and one lower end of the pair of end portions 43. The flange portion 45 is provided with a plurality of through holes 48.

  On the top surface portion 41 of the upper case 40, elongated, substantially rectangular fixing portions 46 formed in a raised shape by drawing are arranged at predetermined intervals along the longitudinal direction. By forming by drawing, the rigidity of the fixing portion 46 can be increased. Each fixing portion 46 is provided with two through holes 47. The upper case 40 and the lower case 50 are fixed by a fastening member (not shown) inserted through the through hole 48 and the through hole 58 with the flange portion 45 of the upper case 40 and the flange portion 55 of the lower case 50 in contact with each other. Is done.

The battery modules 70 are arranged in a row at predetermined intervals along the longitudinal direction on the bottom surface portion 51 of the lower case 50.
FIG. 5 is a schematic diagram of an embodiment of a battery module. The battery module 70 includes a plurality of cylindrical secondary battery cells 75 such as lithium ion secondary batteries in a battery case 71 made of aluminum or synthetic resin. The battery case 71 is configured by arranging a pair of side plate portions on the side edges in the longitudinal direction across the central case portion. The secondary battery cell 75 is accommodated in the central case portion so as to be parallel to the short direction before attaching one side edge. Although not shown, the positive and negative electrodes of each secondary battery cell 75 are electrically connected by a bus bar. An inlet 72 for introducing a cooling gas such as air into the battery case 71 is formed in the upper part of the battery case 71. Although not shown, the cooling gas outlets are provided in the lower part facing the upper part or both ends or one end part of the battery case 71 in the longitudinal direction.

The control device 10 is disposed above the upper case 40 of the case member 60.
FIG. 3 is a perspective view showing the internal structure of the control device 10 shown in FIG. 1, and FIG. 4 is a plan view of the module case 30 shown in FIG. 1 with the upper case 40 removed. The control device 10 accommodates a plurality of integrated circuits constituting a cell controller in a control unit case 11. The control device 10 manages and controls the state of the secondary battery cell 75 according to a command from the host battery controller. The management and control of the state of the plurality of secondary battery cells 75 include measurement of the voltage of each secondary battery cell 75, adjustment of the amount of electricity stored in each secondary battery cell 75, and the like. The control device 10 incorporates a voltage sensor (not shown) in order to measure voltage. As shown in FIG. 4, the control device 10 is connected to a battery module 70 disposed in the lower case 50 by a connection line 12.

The duct 20 is disposed between the top surface portion 41 of the upper case 40 of the case member 60 and the control device 10. As shown in FIG. 1, the duct 20 is formed with an opening (notch) 21 through which an external plate 90 for attaching the control device 10 to the case member 60 is inserted. Although not shown in the drawings, a flange portion that is bent substantially perpendicularly from the side surface is formed at the peripheral portion of the duct 20, and a plurality of through holes are provided in the flange portion. The duct 20 is fixed to the top surface portion 41 of the upper case 40 by a fastening member (not shown) that passes through a through hole provided in the flange portion.
The opening 21 of the duct 20 is formed corresponding to the fixed portion 46A at a predetermined position. As will be described in detail later, the duct 20 is fastened together with the fixed portion 46 </ b> A at a predetermined position of the top surface portion 41 together with the internal plate 80 in a state where the external plate 90 is disposed in the opening 21 of the duct 20. A passage for a cooling medium is formed in the duct 20, and the cooling medium introduced from the inlet on the one end 22 side of the duct 20 is shown in FIG. 5 from an exhaust port (not shown) provided at the bottom of the duct 20. The battery module 70 is sent to the inlet 72 of the battery case 71 and introduced into the battery case 71 to cool the secondary battery cell 75.

  As shown in FIG. 2, a plurality (four in the embodiment) of internal plates 80 are attached in the lower case 50 at predetermined intervals along the longitudinal direction of the lower case 50. The internal plate 80 is disposed between the battery modules 70, improves the rigidity of the lower case 50, and also functions as a partition plate for the battery module 70. One external plate 90 that fixes the control device 10 is attached to the outside of the upper case 40. The inner plate 80 and the outer plate 90 are each formed by pressing a metal plate that is higher in rigidity than the lower case 50 and the upper case 40, in other words, having a large plate thickness.

  6 (A) and 6 (B) show a state in which the inner plate is attached to the lower case shown in FIG. 1, and FIG. 6 (A) is a perspective view seen from the upper front side, and FIG. ) Is a perspective view seen from the upper rear side. FIG. 7 is an enlarged sectional view showing a fixing structure between the upper case and the lower case and a fixing structure between the upper case and the lower case shown in FIG. 12 is an enlarged perspective view showing a state in which the upper case 40, the external plate 90, and the control device 10 are assembled. Each internal plate 80 has an upper mounting portion 83 on the upper side of the main body 81, a lower mounting portion 82 on the lower side, and side mounting portions 84 on both sides, which are folded at about 90 degrees with respect to the main body 81. It is formed by bending. Each of the upper mounting portion 83 and the lower mounting portion 82 is provided with a plurality of through holes 85, and each of the side portion mounting portions 84 is provided with one through hole 86 (see FIG. 2). A nut 62 (see FIG. 7) is joined to the back surface of the upper mounting portion 83 coaxially with each through hole 85 by welding or the like.

Each internal plate 80 has the side attachment portion 84 in contact with the inner surface of the side portion 52 of the lower case 50, and the through hole 86 of the inner plate 80 and the through hole 57 of the side portion 52 of the lower case 50. The fastening member is inserted and fastened by a nut (not shown) and fixed to the lower case 50.
The lower mounting portion 82 of each internal plate 80 is fixed to the lower case 50 by inserting a fastening member 89 through the through hole 85 of the internal plate 80 and the through hole 56 of the bottom surface portion 51 of the lower case 50 and fastening with a nut 88. The
Each internal plate 80 disposed corresponding to each fixing portion 46 of the top surface portion 41 is provided with a fastening member (not shown) on the top surface portion 41 except for the internal plate 80 disposed corresponding to the fixing portion 46A at a predetermined position. And is fastened to a nut 62 (see FIG. 7) joined to the back surface of the upper mounting portion 83 and fixed to the top surface portion 41 at the upper mounting portion 83.

  As shown in FIGS. 2 and 12, the external plate 90 includes a base portion (lower surface side attaching portion) 91 and two support portions 92 a and 92 b bent substantially perpendicularly from the base portion 91. Each support portion 92a, 92b is formed with an upper surface side attachment portion 93 that is bent at approximately 90 degrees with respect to the support portions 92a, 92b in the direction opposite to the base portion 91. A plurality of through holes 95 are provided in the upper surface side attachment portion 93. The base portion 91 is provided with a through hole 97 at a position corresponding to the through hole 47.

  The support portion 92a of the outer plate 90 is disposed corresponding to the fixed portion 46A at a predetermined position of the top surface portion 41 of the upper case 40. At this position, the outer plate 90 is fixed to the top surface portion 41 of the upper case 40. The The duct 20 is fixed to the upper case 40 in a state where the support portion 92 a is inserted into the opening portion 21. In this state, the interval between the support portion 92a and the support portion 92b of the external plate 90 is set so that the support portion 92b of the external plate 90 is positioned on the side of the duct 20.

  The control unit case 11 of the control device 10 is formed with a flange portion 13 provided with a through hole 14. The control device 10 is attached to the external plate 90 by a fastening member that passes through the through hole 14 of the flange portion 13 and the through hole 95 of the external plate 90. In the control device 10, the lower portion of the side surface opposite to the flange portion 13 is fixed to a support bracket 19 (see FIG. 3) attached to the upper case 40 by a fastening member (not shown).

With reference to FIG. 7, a structure for fixing the inner plate 80 and the outer plate 90 to the upper case 40 will be described.
In FIG. 2, the upper case 40 is disposed on the lower case 50, and the through hole 48 in the peripheral portion of the upper case 40 and the through hole 58 in the peripheral portion of the lower case 50 are aligned. Accordingly, as shown in FIG. 7, the through hole 47 (see FIG. 2) provided in the fixed portion 46 </ b> A at a predetermined position of the upper case 40 and the through hole provided in the upper mounting portion 83 of the internal plate 80. The holes 85 (see FIG. 6) are aligned. If there is a misalignment, the upper case 40 is displaced so that the center of the through hole 47 of the fixed portion 46A at a predetermined position of the upper case 40 is substantially coaxial with the center of the through hole 85 of the internal plate 80. As described above, the nut 62 is joined to the upper mounting portion 83 of the inner plate 80.

  The outer plate 90 is disposed on the fixing portion 46A of the upper case 40, and the through hole 97 provided in the base portion 91 of the outer plate 90 is aligned with the through hole 47 of the fixing portion 46A of the upper case 40. That is, the center of the through hole 97 provided in the base portion 91 of the outer plate 90, the center of the through hole 47 provided in the fixing portion 46A of the upper case 40, and the center of the through hole 85 provided in the upper portion of the inner plate 80. Are substantially coaxial.

In this state, the base portion 91 of the external plate 90 is joined to the fixed portion 46A at a predetermined position of the upper case 40 by spot welding or the like. The base portion 91 of the external plate 90 is melted by the heat energy applied to the welded portion and joined to the fixing portion 46A of the top surface portion 41. In this state, the bolt 61 is inserted through the through hole 97 of the external plate 90, the through hole 47 of the fixing portion 46 </ b> A of the upper case 40, and the through hole 85 of the upper mounting portion 83, and fastened to the nut 62. As a result, the outer plate 90 and the inner plate 80 are fixed to the fixing portion 46A of the upper case 40.
That is, the inner plate 80 and the outer plate 90 are fastened to the top surface portion 41 of the upper case 40 in the same assembly process.

Thereafter, a fastening member is inserted into each through hole 48 in the peripheral portion of the upper case 40 and each through hole 58 in the peripheral portion of the lower case 50 and fastened using a nut or the like, and the upper case 40 and the lower case 50 are connected. And assembling together. This step can also be performed before the inner plate 80 and the outer plate 90 are fastened to the upper case 40.
Then, when the duct 20 is arranged on the top surface portion 41 of the upper cover 40 and fixed to the top surface portion 41 by a fastening member, and the control device 10 is fixed to the top surface side mounting portion 93 of the external plate 90 by the fastening member, FIG. 1 is produced.

According to the battery pack 100 of the one embodiment, the following effects are obtained.
(1) A structure in which a plurality of internal plates 80 fastened to the pair of side portions 52, the bottom surface portion 51, and the top surface portion 41 of the upper case 40 are provided in the lower case 50. In the internal plate 80, the main body portion 81 is disposed substantially perpendicularly to the bottom surface portion 51 of the lower case 50 and the top surface portion 41 of the upper case 40. As described above, since the upper and lower directions and the horizontal direction of the case member 60 are connected by the internal plate 80 inside the case member 60, the rigidity of the case member 60 is increased. Thereby, it is not necessary to use a supporting plate having a large plate thickness and a large weight, and the weight can be reduced.

(2) Since the case member 60 has a structure having high rigidity due to the internal plate 80, even when vibration or impact is generated in the control device 10 disposed on the upper stage side of the battery pack 100, the impact or vibration is lower. The case member 60 on the side can be dispersed. For this reason, the vibration of the control device 10 is increased, and it is possible to prevent a large load from being applied to the internal electronic circuit and the case member 60 of the control device 10.

(3) The external plate 90 is fixed to the upper case 40, and the control device 10 is fixed to the external plate 90. The external plate 90 includes support portions 92 a and 92 b that are substantially perpendicular to the top surface portion 41 of the control device 10 and the upper case 40, and the duct 20 is interposed between the control device 10 and the top surface portion 41 of the upper case 40. A structure to wear. Thus, since the duct 20 is disposed in the space between the control device 10 and the top surface portion 41 of the upper case 40, high-density mounting is achieved, and the battery pack 100 can be reduced in size.

(4) The inner plate 80 is formed as a member independent of the upper case 40 and the lower case 50, and the number and the number of attachments can be increased only by changing the positions of the through holes formed in the upper case 40 and the lower case 50. The position can be changed arbitrarily. In other words, there is commonality. For this reason, even when the size, accommodation number, layout, and the like of the battery modules 70 are different, they can be shared. As a result, the development period can be shortened and the mold cost can be reduced, and the cost can be reduced.

(5) Since the fixed portion 46A is formed by drawing the top surface portion 41 of the upper case 40, the rigidity of the fastening portions of the inner plate 80 and the outer plate 90 can be improved.

(6) The internal plate 80 and the external plate 90 have a structure that can be performed in the same assembly process. For this reason, work efficiency is good and the rigidity of case member 60 can be made high.

Embodiment 2
A battery pack according to a second embodiment of the present invention will be described with reference to FIGS.
FIG. 8 is an external perspective view of the battery pack according to the second embodiment of the present invention, and FIG. 9 is a view of the battery pack shown in FIG. 8 as viewed from the side. 10 is an external perspective view of the duct of the battery pack shown in FIG. 8, and FIG. 11 is an enlarged cross-sectional view showing a fixing structure of each case member of the battery pack shown in FIG.
A battery pack 200 illustrated in FIG. 8 is configured by stacking a module pack 30 to which a duct 20A is attached in a plurality of layers (three layers in the embodiment).
The module pack 30 is the same as that shown in the first embodiment. In contrast to the duct 20 shown in the first embodiment having one opening 21, in the second embodiment, the duct 20 </ b> A has a plurality (four in the embodiment) of openings 21.

In the battery pack 200 of the second embodiment, the external plate 90 is attached to the top surface portion 41 of the upper case 40 of each module pack 30 except for the uppermost module pack 30. The external plate 90 is fastened to the top surface portion 41 together with the internal plate 80 in all (four) fixing portions 46 formed on the top surface portion 41 of each upper case 40. Each external plate 90 has a support portion 92a inserted into the corresponding opening 21 of the duct 20A and is connected to the lower case 50 of the upper module pack 30. For the connection, a through hole (not shown) is formed in the lower case 50, a bolt is inserted into the through hole 95 and the through hole 95 provided in the upper surface side mounting portion 93 of the external plate 90, and from the side opposite to the bolt insertion side. This is done by screwing and fastening the nut 64. By repeating the connection between the external plate 90 and the module pack 30, the module pack 30 can be stacked in layers.
In the second embodiment, the external plate 90 may have a structure having only the support portion 92a and not the support portion 92b. Further, the nut 64 may be joined to the lower surface of the upper surface side mounting portion 93 of the external plate 90.

  Also in the battery pack 200 of the second embodiment, the inner plate 80 is attached to the lower case 50, and the inner plate 80 and the outer plate 90 are fastened to the top surface portion 41 of the upper case 40. Therefore, the battery pack 200 of the second embodiment also has the same effect as the battery pack 100 of the first embodiment.

  Note that the battery pack in which the module pack 30 and the duct 20A are stacked in a plurality of layers and the duct 20 and the control device 10 are stacked in the uppermost layer may be formed by combining the first and second embodiments.

  In the above embodiment, the duct 20 is exemplified as a structure in which the opening 21 through which the external plate 90 is inserted is provided in the center. However, the opening 21 may be formed on one side edge side of the external plate 90 as a notch that is opened to the outside. Moreover, the duct 20 can also be made into the structure extended in U shape which has a folding | returning part.

  In the said embodiment, the member which cools the battery module 70 was illustrated as the duct 20 which supplies cooling gas. However, as the cooling member, a cooling plate in which a cooling path for circulating the cooling liquid is disposed may be used.

  In the above-described embodiment, the structure is illustrated in which the fixing portion 46 is formed on the top surface portion 41 of the upper case 40 by the drawing process corresponding to the upper mounting portion 83 of each internal plate 80. However, the fixing portion 46 may not be formed on the top surface portion 41 of the upper case 40 by drawing.

  A nut may be joined to the inner plate 80 not only to the upper mounting portion 83 but also to the side portion 84 and the lower surface mounting portion 82.

  The internal plate 80 disposed in the lower case 50 need not be disposed between the battery modules 70. A plurality of internal plates 80 may be disposed between the battery modules 70. Each internal plate 80 may not have the side attachment portion 84 that is coupled to the side portion 52 of the lower case 50.

  In the said embodiment, the battery module 70 was illustrated as what has the cylindrical secondary battery cell 75. As shown in FIG. However, the battery module 70 may have a square secondary battery cell. Moreover, the secondary battery cell 75 is good also as other battery cells, such as nickel hydride batteries other than a lithium ion battery.

  The above-described battery packs 100 and 200 are used as power supply devices for vehicles such as other electric vehicles, for example, railway vehicles such as hybrid trains, passenger cars such as buses, cargo vehicles such as trucks, and industrial vehicles such as battery-type forklift trucks. It can also be used.

  In addition, the battery packs 100 and 200 may be applied to a power storage device that constitutes a power supply device other than an electric vehicle, such as an uninterruptible power supply device used in a computer system or a server system, or a power supply device used in a private power generation facility. it can.

  In addition, the battery packs 100 and 200 of the present invention can be variously modified and configured within the scope of the gist of the invention.

DESCRIPTION OF SYMBOLS 10 Control apparatus 11 Case for control parts 20, 20A Duct (cooling member)
DESCRIPTION OF SYMBOLS 21 Open part 30 Module pack 40 Upper case 41 Top surface part 42 Side part 46, 46A Fixed part 50 Lower case 51 Bottom part 52 Side part 60 Case member 61, 63 Bolt 62, 64 Nut 70 Battery module 71 Battery case 72 Inlet 75 Secondary battery cell 80 Internal plate 81 Body portion 82 Lower mounting portion 83 Upper mounting portion 84 Side portion mounting portion 90 External plate 91 Base portion (lower surface side mounting portion)
92a, 92b support part 93 upper surface side attachment part 100, 200 battery pack

Claims (10)

A case member composed of a lower case having a bottom surface portion on which a plurality of battery modules are disposed, and an upper case having a top surface portion;
It is disposed in the lower case, and has a lower mounting portion, an upper mounting portion, and a main body portion that connects the lower mounting portion and the upper mounting portion, and the lower mounting portion is fixed to the bottom surface portion of the lower case. A plurality of internal plates fixed to the inner surface of the top surface portion of the upper case, the upper mounting portion;
A lower surface side mounting portion, an upper surface side mounting portion, and a support portion that connects the lower surface side mounting portion and the upper surface side mounting portion, wherein the lower surface side mounting portion is an inner plate of any one of the plurality of inner plates. One or more external plates respectively fixed to the outer surface of the top surface portion corresponding to the portion of the top surface portion to which the upper mounting portion is fixed;
And a cooling member attached to an outer surface of the top surface portion of the upper case. The battery pack according to claim 1,
The said cooling member is a battery pack which is a duct which has an opening part or notch part which penetrates the said support part of the said external plate. The battery pack according to claim 1,
The lower case has a pair of side parts, and the inner plate has a pair of side part attaching parts fixed to the side parts. The battery pack according to claim 1,
The battery packs wherein the inner plate and the outer plate are thicker than the top surface of the upper case. The battery pack according to claim 1,
The plurality of battery modules are arranged in a row on the bottom surface of the lower case,
The plurality of internal plates are battery packs arranged between the battery modules arranged in a row . The battery pack according to claim 1,
The upper mounting portion of the inner plate, the top surface portion of the upper case, and the lower surface side mounting portion of the outer plate are fastened by a fastening member inserted through a through portion provided in the top surface portion. pack. The battery pack according to claim 1,
The battery pack, wherein the top surface portion of the upper case is drawn around a fixed portion to which the upper mounting portion of the inner plate and the lower surface side mounting portion of the outer plate are fixed. The battery pack according to claim 1,
Furthermore, a battery pack provided with the control apparatus fixed to the said upper surface side attaching part of the said external plate. The battery pack according to claim 1,
The battery pack, wherein the case member and a case member different from the case member are connected and stacked by a plurality of the external plates. The battery pack according to claim 9, wherein
A battery pack in which another cooling member is disposed between the case member connected by a plurality of the external plates and the other case member.

Images