Battery pack

Abstract

To provide a battery pack which has sufficient strength rigidity, inhibits increase of weight of the battery pack, and enables improvement of loading efficiency of secondary batteries.SOLUTION: A battery pack includes: a laminated body in which a plurality of secondary batteries is laminated; restraint members each of which extends in a lamination direction of the laminated body along a first surface of the laminated body and restrains the plurality of secondary batteries; and a plurality of extrusion materials arranged in the lamination direction along a second surface of the laminated body and supporting the laminated body. Each of the extrusion material is arranged so that its extrusion direction is set to a direction intersecting with the lamination direction.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a battery pack. [Background technology]

[0002] In order to reduce CO2 emissions in light of climate-related disasters, the electrification of industrial machinery is being promoted, and research is also being conducted on secondary batteries as an energy source for vehicle applications. Such secondary batteries are stacked to form a secondary battery group (battery module), and the battery module is mounted in a battery pack housing (battery pack case) to form a battery pack. As an example of such a battery pack, Patent Document 1 discloses a battery pack that includes a battery stack including multiple rectangular batteries. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2019 / 151036 Summary of the Invention [Problem to be solved by the invention]

[0004] The battery pack case is equipped with structural members such as cross members and side frames to ensure strength and rigidity, resistance to external forces, and for the purpose of connecting it to the vehicle. These structural members contribute to the strength and rigidity of the battery pack case in the fore-and-aft and left-right directions of the vehicle.

[0005] However, the main purpose of the structural members of the battery pack case is to secure and protect the battery module, and using the structural members to ensure the strength and rigidity of the battery pack can result in the battery pack case becoming large and heavy.In addition, the structural members of the battery pack case occupy part of the mounting space for the secondary batteries, so there was a demand for improving the mounting efficiency of the secondary batteries.

[0006] An object of the present invention is to provide a battery pack that has sufficient strength and rigidity, suppresses an increase in the weight of the battery pack, and improves the mounting efficiency of secondary batteries, thereby contributing to improved energy efficiency. [Means for solving the problem]

[0007] According to the present invention, A stack of a plurality of secondary batteries; a restraining member extending in a stacking direction of the stack along a first surface of the stack and restraining the plurality of secondary batteries; a plurality of extrusion members arranged in the stacking direction along the second surface of the stack and supporting the stack; Each of the extrusion materials is arranged such that the extrusion direction thereof intersects with the stacking direction. A battery pack is provided. Effect of the Invention

[0008] According to the present invention, it is possible to provide a battery pack that has sufficient strength and rigidity, suppresses an increase in the weight of the battery pack, and improves the mounting efficiency of the secondary battery. [Brief description of the drawings]

[0009] [Figure 1] 1 is a schematic diagram of a battery pack according to an embodiment; [Diagram 2] FIG. 2 is a schematic diagram of a stack of a plurality of secondary batteries according to one embodiment. [Diagram 3] FIG. 2 is a schematic diagram of a cross section taken along line AA of a secondary battery according to one embodiment. [Figure 4] 1 is a schematic diagram of a battery module according to an embodiment; [Diagram 5] 1 is a schematic diagram of a plurality of battery modules according to an embodiment. [Figure 6] FIG. 2 is another schematic diagram of a plurality of battery modules according to an embodiment. [Figure 7]1 is a schematic diagram of a battery module provided in a battery pack case according to one embodiment; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, the embodiments will be described in detail with reference to the accompanying drawings. Note that the following embodiments do not limit the invention according to the claims, and not all combinations of features described in the embodiments are essential to the invention. Two or more features among the multiple features described in the embodiments may be arbitrarily combined. In addition, the same reference numbers are used for the same or similar configurations, and duplicated descriptions are omitted.

[0011] <Battery pack according to this embodiment> The battery pack according to this embodiment includes a stack of multiple secondary batteries, a binding member extending in the stacking direction of the stack along a first surface of the stack and binding the multiple secondary batteries, and a plurality of extrusion members arranged in the stacking direction along a second surface of the stack and supporting the stack. Furthermore, each extrusion member is arranged so that its extrusion direction intersects with the stacking direction. This provides sufficient strength and rigidity, suppresses weight increase of the battery pack, and improves the mounting efficiency of the secondary batteries.

[0012] 1 is a schematic diagram of a battery pack according to one embodiment. The battery pack 1000 can be mounted on an electric vehicle such as a hybrid car or an EV (not shown), for example. The battery pack 1000 includes a secondary battery 100, a restraining member 200 that restrains the secondary battery 100, a battery pack case 300, an extrusion member 310 that is provided in the battery pack case 300 and supports the secondary battery 100, and a battery pack cover 500 that covers the secondary battery 100.

[0013] A plurality of secondary batteries 100 are stacked to form a stacked body 110. The stacked body 110 is restrained by a restraining member 200 extending in the stacking direction along a first surface of the stacked body 110. The stacked body 110 and the restraining member 200 form a battery module 400. The plurality of battery modules 400 are stacked in a direction intersecting the stacking direction of the stacked body 110.

[0014] 1, the battery modules 400 are shown separated from the battery pack case 300 and the battery pack cover 500, but the battery modules 400 are supported by the extrusion members 310 provided in the battery pack case 300 and covered by the battery pack cover 500 to form the battery pack 1000. In addition, the battery pack case 300 is provided with a plurality of extrusion members 310, which are arranged such that the extrusion direction thereof intersects with the stacking direction of the stack 110. Each component of the battery pack 1000 will be described below in order.

[0015] (Secondary battery) Fig. 2 is a schematic diagram of a stack of a plurality of secondary batteries according to one embodiment. Fig. 3 is a schematic diagram of a cross section of a secondary battery according to one embodiment taken along line AA. The secondary battery 100 has the configuration of the secondary battery shown in Fig. 3 arranged inside an exterior body, and as shown in Fig. 2, the external shape of the secondary battery 100 is a substantially rectangular parallelepiped.

[0016] 2, a plurality of secondary batteries 100 are stacked in the thickness direction (Z direction) of components 120 of the secondary batteries 100 to form a stack 110 (battery group). The secondary batteries 100 may be stacked alternately in the Z direction with insulating separators (not shown) in a state in which they are arranged in an upright position. The stack 110 is formed by stacking rectangular parallelepiped-shaped secondary batteries 100 in the Z direction, and the overall external shape of the stack 110 is a rectangular parallelepiped shape.

[0017] The number of secondary batteries 100 in the laminate 110 is not particularly limited, and in one embodiment, it can be 5 or more, in another embodiment, 10 or more, in yet another embodiment, 20 or more, and in yet another embodiment, 40 or more, and in one embodiment, it can be 100 or less, in another embodiment, 90 or less, in yet another embodiment, 80 or less, and in yet another embodiment, 60 or less.

[0018] The laminate 110 has a first surface 111a (YZ surface) seen from the longitudinal direction (X direction) of the secondary battery 100, a second surface 112a (XZ surface) seen from the width direction (Y direction) of the secondary battery 100, and a third surface 113a (XY surface) seen from the thickness direction (Z direction) of the components 120 of the secondary battery 100. The laminate 110 also has a first surface 111b, a second surface 112b, and a third surface 113b that face the first surface 111a, the second surface 112a, and the third surface 113a, and has the same shape and dimensions as the respective facing surfaces.

[0019] In the components 120 of the secondary battery 100 shown in FIG. 3, the X direction indicates the extension direction of the lead terminals, the Y direction indicates the direction perpendicular to the extension direction of the lead terminals, and the Z direction indicates the stacking direction of the components 120 of the secondary battery 100, and the X direction, Y direction, and Z direction are perpendicular to each other.

[0020] The secondary battery includes a secondary battery component 120, a lead terminal 130, a current collecting terminal 140, and an exterior body 150 that encases the component 120, and has a battery cell shape suitable for an assembled battery. The component 120 has a rectangular parallelepiped shape as a whole, and has a two-layer structure of positive and negative electrode layers including two positive electrode layers 121a and 121b and two negative electrode layers 124a and 124b, as shown in FIG. 3. However, the positive and negative electrode layers of the component 120 may be one layer or three or more layers. A solid electrolyte layer 127 is provided between the positive electrode layer 121a and the negative electrode layer 124a, and between the positive electrode layer 121b and the negative electrode layer 124b.

[0021] The positive electrode layers 121a and 121b each include a positive electrode active material layer 122, and the two positive electrode layers 121a and 121b share a positive electrode current collector 123. The positive electrode current collector 123 is disposed in a layered form in the center of the component 120 in the Z direction, and the positive electrode active material layers are laminated on the front and back sides of the positive electrode current collector 123.

[0022] The negative electrode layers 124a, 124b are disposed on one side of the positive electrode layers 121a, 121b in the Z direction and on the other side of the positive electrode layers 121a, 121b, and are stacked so that the positive electrode layers 121a, 121b are sandwiched between the negative electrode layers 124a, 124b. However, a configuration in which two positive electrode layers sandwich two negative electrode layers, which is the opposite of the configuration of this embodiment, can also be adopted. The negative electrode layers 124a, 124b each include a negative electrode active material layer 125 and a negative electrode current collector 126. The two negative electrode current collectors 126 are each formed in a layered form on the outermost layer of the component 120.

[0023] Examples of the active material constituting the positive electrode active material layer 122 include lithium cobalt oxide, lithium nickel oxide, lithium manganate, and lithium metal phosphate. Examples of the active material constituting the negative electrode active material layer 125 include lithium-based materials and silicon-based materials. Examples of the lithium-based materials include Li metal and Li alloys. Examples of the silicon-based materials include Si and SiO. Other examples of the active material constituting the negative electrode active material layer 125 include carbon materials such as graphite, soft carbon, and hard carbon, tin-based materials (Sn, SnO, etc.), and lithium titanate.

[0024] The electrolyte layer 127 includes, for example, a solid, gel, or liquid electrolyte having ion conductivity, and examples of the material include sulfide-based solid electrolyte material, oxide-based solid electrolyte material, nitride-based solid electrolyte material, halide-based solid electrolyte material, and gel materials containing lithium-containing salts and lithium ion conductive ionic liquids. The positive electrode collector 123 and the negative electrode collector 126 are made of, for example, a metal foil, a metal sheet, or a metal plate of aluminum, copper, SUS, or the like. The positive electrode active material layer 122, the negative electrode active material layer 125, and the electrolyte layer 127 may be formed by binding particles of the materials constituting them with an organic polymer compound-based binder. In one embodiment, the secondary battery 100 may be an all-solid-state battery.

[0025] The lead terminals 130a and 130b are connected to a charger or an electric load to charge or discharge the component 120. One end of the lead terminals 130a and 130b is located outside the exterior body 150, and the other end is located inside the exterior body 150.

[0026] The other end of each of the lead terminals 130a and 130b is connected to the positive electrode current collector 123 via a current collector terminal 140a inside the exterior body 150, and the lead terminal 130a forms a terminal for the positive electrode. The lead terminal 130b and the current collector terminal 140b are formed, for example, of a metal sheet or metal plate having electrical conductivity. Meanwhile, the other end of the lead terminal 130b is connected to the negative electrode current collector 126 via a current collector terminal 140b inside the exterior body 150, and the lead terminal 130b forms a terminal for the negative electrode. The lead terminal 130b and the current collector terminal 140b are formed, for example, of a metal sheet or metal plate having electrical conductivity.

[0027] The arrangement of the lead terminals 130a, 130b is not particularly limited, and the lead terminals 130a, 130b may be arranged at both ends of the secondary battery 100 in the longitudinal direction (X direction) or at one end (at the top) of the secondary battery 100 in the width direction (Y direction).

[0028] (Battery module) 4 is a schematic diagram of a battery module according to one embodiment. The battery module 400 includes a stacked body 110 in which a plurality of secondary batteries 100 are stacked, and a restraining member 200 that restrains the plurality of secondary batteries 100. The external shape of the battery module 400 is a rectangular parallelepiped shape.

[0029] Restraint member The restraining member 200 extends in the stacking direction (Z direction) of the stack 110 along the first surface 111a of the stack 110. In one embodiment, the restraining member 200 extends in the stacking direction (Z direction) of the stack 110 so as to cover the entire first surface 111a of the stack 110. Also, although the stack 110 and the restraining member 200 are illustrated as being separated in FIG. 4, the stack 110 is joined to the restraining member 200. This can provide the battery pack with sufficient strength and rigidity, particularly in the stacking direction of the stack 110.

[0030] The material of the restraint member 200 is not particularly limited as long as it can provide sufficient strength and rigidity to the battery pack, but it can be a metal sheet or plate made of aluminum, copper, SUS, or the like.

[0031] The shape of the restraining member 200 is not particularly limited as long as it can restrain a plurality of secondary batteries 100. In one embodiment, the surface of the restraining member 200 as viewed from the thickness direction (X direction) can be rectangular, trapezoidal, parallelogram, or the like. As viewed from the thickness direction (X direction) of the restraining member 200, the length in the width direction (Y direction) may be constant or may vary partially along the longitudinal direction (Z direction) of the restraining member 200. As well, the thickness (length in the X direction) of the restraining member 200 may be constant or may vary partially along the longitudinal direction of the restraining member 200. This allows the plurality of secondary batteries 100 to be sufficiently restrained.

[0032] The lower limit of the thickness (length in the X direction) of the restraining member 200 is not particularly limited, but may be 1 mm or more at the thinnest point in one embodiment, 2 mm or more at another embodiment, and 5 mm or more at another embodiment. This provides sufficient strength and rigidity to the battery pack. Also, the upper limit of the thickness (length in the X direction) of the restraining member 200 is not particularly limited, but may be 20 mm or less at the thinnest point in one embodiment, 10 mm or less at another embodiment, and 7 mm or less at another embodiment. This increases the space in which the secondary battery 100 can be mounted.

[0033] Furthermore, restraining member 200 may be formed such that one or both ends in the width direction (Y direction) of restraining member 200 cover a part of laminate 110. For example, restraining member 200 may be shaped so that the surface viewed from the Z direction has an I-shape or a U-shape.

[0034] The restraining member 200 is bonded to the laminate 110 by a bonding method that is not particularly limited, but an example is bonding by filling an adhesive between the first surface 111a of the laminate 110 and the restraining member 200. The adhesive is not particularly limited, and examples include acrylic resin, urethane resin, silicone resin, epoxy resin, and olefin resin. In addition, an insulating separator (not shown) may be disposed between the restraining member 200 and the laminate 110.

[0035] Battery Modules Fig. 5 is a schematic diagram of a plurality of battery modules according to one embodiment. A plurality of battery modules 400a to 400f are arranged in the longitudinal direction (X direction) of the secondary battery 100 along the third surface 113a of the laminated body 110 to form a battery module group 410. In Fig. 5, the battery module group 410 is formed of six battery modules 400, but the number is not particularly limited.

[0036] Furthermore, the battery module 400f located at the end of the battery module group 410 has two binding members 200 along the first surfaces 111a and 111b of the laminated body 110, and these binding members 200 are arranged opposite to each other. In other words, each of the battery modules 400a to 400f is arranged in a direction intersecting the longitudinal direction of the binding members 200, and each binding member 200 is arranged opposite to each other. As a result, the battery modules 400 and the binding members 200 are arranged alternately in the X direction, and each battery module 400 is sandwiched between the binding members 200.

[0037] Also, the battery module 400 can be joined to the binding member 200 of the adjacent battery module 400. This allows the battery module group 410 to be considered as a large battery module that can exhibit high strength and rigidity. Also, the joining method is not particularly limited, and an example is a method of joining by filling an adhesive between the first surface 111b of the stack 110 of the battery module 400 and the binding member 200 of the adjacent battery module 400. The adhesive may be one as described above.

[0038] In this way, since the battery module 400 is joined by the restraining member 200, the battery pack 1000 according to this embodiment can eliminate the need for structural members such as the cross member of the battery pack case 300, which are provided mainly for the purpose of fixing and protecting the battery module 400. In other words, in the battery pack 1000 according to this embodiment, the securing of the strength and rigidity of the battery pack case 300 and the external force resistance performance, which were previously provided by structural members such as the cross member of the battery pack case 300, and the holding structure of the secondary battery 100 are integrated into the restraining member 200. As a result, the battery module 400 has sufficient strength and rigidity, the battery pack case 300 can be made lighter, and the space for installing the secondary battery 100 is increased, improving the mounting efficiency of the secondary battery 100.

[0039] End Plates 6 is another schematic diagram of a plurality of battery modules according to an embodiment. The battery module group 410 may have end plates 600a, 600b extending in the arrangement direction (X direction) of the plurality of battery modules 400 along the third surfaces 113a, 113b of the laminated body 110. In other words, the longitudinal direction of the end plates 600a, 600b intersects with the longitudinal direction of the restraining member 200. This can further provide sufficient strength and rigidity to the battery pack.

[0040] 6, the stack 110 and the restraining member 200 are shown separately from the end plates 600a and 600b, but the stack 110 and the restraining member 200 are joined to the end plates 600a and 600b. The joining method is not particularly limited, and any known technique can be used as appropriate.

[0041] 6, one end plate 600a, 600b is provided on each of the third surfaces 113a and 113b of the laminate 110, but multiple end plates 600a, 600b may be provided on each of the third surfaces 113a and 113b of the laminate 110. For example, the end plates 600a, 600b may have a length sufficient to connect adjacent battery modules 400 in the longitudinal direction (X direction), or multiple end plates 600a, 600b may be provided on each of the third surfaces 113a and 113b of the laminate 110. This facilitates assembly of the battery module group 410.

[0042] The material of the end plates 600a, 600b is not particularly limited as long as it can provide sufficient strength and rigidity to the battery pack, but may be a metal sheet or plate such as aluminum, copper, or SUS.

[0043] In one embodiment, the end plates 600a, 600b are formed with holes through which fastening bolts can pass for fixing the battery module 400 to the battery pack case 300. The battery pack case 300 is formed with a pair of female threads into which the pair of fastening bolts are screwed.

[0044] (Extrusion material) Fig. 7 is a schematic diagram of a battery module provided in a battery pack case according to one embodiment. In Fig. 7, a part of the battery module 400 is removed in order to facilitate understanding of the positional relationship between the extrusion material 310 and the laminate 110 and the structure of the extrusion material 310. In other words, the battery module 400 can be arranged to cover substantially the entire bottom surface of the battery pack case 300.

[0045] The battery module 400 is provided such that the laminate 310 is supported by the extruded material 310 provided in the battery pack case 300. In one embodiment, the battery module 400 may be provided such that the laminate 110 is placed on the extruded material 310. The battery module 400 may be provided such that the entire laminate 110 is placed on the extruded material 310, or such that a portion of the laminate 110 is placed on the extruded material 310.

[0046] A plurality of extrusion members 310 are arranged in the stacking direction along the second surface 112b of the laminate 110. The number of extrusion members 310 can be determined according to the dimensions, strength, and rigidity of the battery pack, and is not particularly limited. In one embodiment, the number of extrusion members 310 can be 2 or more, in another embodiment, 4 or more, in yet another embodiment, 6 or more, and in yet another embodiment, 8 or more, and in one embodiment, 20 or less, in another embodiment, 18 or less, in yet another embodiment, 16 or less, and in yet another embodiment, 14 or less. In addition, the extrusion members 310 may be provided on the bottom surface of the tray-type battery pack case 300, or may be provided to form the bottom surface of the tray-type battery pack case 300.

[0047] The extrusion material 310 according to this embodiment is obtained by extrusion processing. The longitudinal direction of the extrusion material 310 is approximately the same as the extrusion direction (X direction). The bending rigidity of the extrusion material in the extrusion direction tends to be higher than the bending rigidity in the direction perpendicular to the extrusion direction. In this embodiment, each of the extrusion materials 310 is arranged such that the extrusion direction intersects with the stacking direction of the laminate 110. In one embodiment, each of the extrusion materials 310 can be arranged such that the extrusion direction intersects with the stacking direction of the laminate 110.

[0048] As described above, the restraint member 200 is extended and joined in the stacking direction (Z direction) of the laminate 110, thereby providing the battery pack with sufficient strength and rigidity in the stacking direction of the laminate 110, while the extrusion material 310 is arranged so that its extrusion direction is a direction (X direction) that intersects the stacking direction (Z direction) of the laminate 110, thereby providing the battery pack with sufficient strength and rigidity in the direction that intersects the stacking direction of the laminate 110.

[0049] Thus, the battery pack 1000 according to the present embodiment includes the extrusion member 310 capable of imparting strength and rigidity in addition to the restraint member 200 provided on the battery module 400, and therefore the battery pack 1000 according to the present embodiment does not require structural members such as cross members and side frames for ensuring the strength and rigidity of the battery pack case 300 and resistance to external forces. In the battery pack 1000 according to the present embodiment, the restraint member 200 and the extrusion member 310 are responsible for ensuring the strength and rigidity of the battery pack case 300 and the resistance to external forces, which were previously performed by structural members such as the cross members and side frames of the battery pack case 300, and for the holding structure of the secondary battery 100. As a result, the battery module 400 has sufficient strength and rigidity, and the battery pack case 300 can be made lighter, and the space for installing the secondary battery 100 is increased, thereby improving the mounting efficiency of the secondary battery 100.

[0050] In addition, in one embodiment, the battery pack 1000 according to this embodiment can be mounted on a vehicle, and the battery pack 1000 can be arranged so that a direction intersecting the stacking direction of the laminate 110 faces the front-rear direction L1 of the vehicle. In other words, the battery pack 1000 is arranged so that the extrusion direction of the extrusion material 310 approximately coincides with the front-rear direction L1 of the vehicle, and the stacking direction of the laminate 110 (the longitudinal direction of the restraining member 200) approximately coincides with the left-right direction L2 of the vehicle. This allows the battery pack 1000 to be given sufficient strength and rigidity in two different directions when the battery pack 1000 is mounted on a vehicle.

[0051] In another embodiment, the extruded material 310 may include a fluid passage 320 through which a heat medium passes. The fluid passage 320 extends along the extrusion direction of the extruded material 310, and may be formed when the extruded material 310 is extruded. This allows the battery module 400 to be efficiently heated and cooled. In FIG. 7, one extruded material 310 is illustrated as including the fluid passage 320, but the fluid passage 320 may be provided in all or some of the extruded materials 310.

[0052] 7, the secondary battery 100 is arranged so that a predetermined surface (lower surface) of the secondary battery 100 faces the extrusion material 310, thereby transferring heat from the secondary battery 100 to the extrusion material 310, or transferring heat from the extrusion material 310 to the secondary battery 200. This allows the secondary battery 100 to be cooled or heated. The heat medium passing through the fluid passage 320 is not particularly limited as long as it can heat or cool, and may be a gas medium, a liquid medium, or the wind generated when the vehicle is running, or other known techniques may be used as appropriate.

[0053] <Summary of the embodiment> The above embodiment discloses at least the following battery pack.

[0054] 1. The battery pack (1000) of the above embodiment is a stack (110) in which a plurality of secondary batteries (100) are stacked; a restraining member (200) extending in the stacking direction of the stack (110) along a first surface (111a) of the stack (110) and restraining the plurality of secondary batteries (100); a plurality of extrusion members (310) arranged in the stacking direction along the second surface (112a) of the stack (110) and supporting the stack (110); Each of the extrusion members (310) is arranged so that the extrusion direction thereof intersects with the stacking direction. According to this embodiment, it is possible to provide the battery pack with sufficient strength and rigidity, while suppressing an increase in the weight of the battery pack and improving the mounting efficiency of the secondary batteries.

[0055] 2. In the above embodiment, The laminate (110) is joined to the restraining member (200). According to this embodiment, it is possible to impart sufficient strength and rigidity to the battery module.

[0056] 3. In the above embodiment, The laminate (110) is placed on the extrusion material (310). According to this embodiment, sufficient strength and rigidity can be imparted to the battery module, and the battery pack can be efficiently heated and cooled.

[0057] 4. In the above embodiment, The stack (110) and the restraining member (200) are arranged in a plurality of layers in a direction intersecting the stacking direction, The restraining members (200) are disposed opposite each other. According to this embodiment, it is possible to provide the battery module with sufficient strength and rigidity, suppress an increase in the weight of the battery pack, and improve the mounting efficiency of the secondary batteries.

[0058] 5. In the above embodiment, The extruded material (310) includes a fluid passage (320) through which a heat transfer medium passes, and the fluid passage (320) extends in the extrusion direction. According to this embodiment, the battery pack can be efficiently heated and cooled.

[0059] 6. In the above embodiment, The battery pack (1000) is mounted on a vehicle, The battery pack (1000) is arranged so that a direction intersecting the stacking direction faces the front-rear direction of the vehicle. According to this embodiment, it is possible to impart sufficient strength and rigidity to the battery module in the front-rear and left-right directions of the vehicle.

[0060] Although the embodiment of the invention has been described above, the invention is not limited to the above embodiment, and various modifications and variations are possible within the scope of the gist of the invention. [Explanation of symbols]

[0061] 100 secondary battery, 110 laminate, 111a, 111b first surface, 112a, 112b second surface, 113a, 113b third surface, 120 component, 121a, 121b positive electrode layer, 122 positive electrode active material layer, 123 positive electrode current collector, 124a, 124b negative electrode layer, 125 negative electrode active material layer, 126 negative electrode current collector, 127 electrolyte layer, 130a, 130b lead terminal, 140a, 140b current collector terminal, 150 exterior body, 200 restraining member, 300 battery pack case, 310 extrusion material, 320 fluid passage, 400, 400a to 400f battery module, 410 battery module group, 500 battery pack case, 600a, 600b end plate

Claims

1. A stack of a plurality of secondary batteries; a restraining member extending in a stacking direction of the stack along a first surface of the stack and restraining the plurality of secondary batteries; a plurality of extrusion members arranged in the stacking direction along the second surface of the stack and supporting the stack; Each of the extrusion materials is arranged such that the extrusion direction thereof intersects with the stacking direction. A battery pack characterized by:

2. The battery pack according to claim 1 , wherein the laminate is joined to the restraining member.

3. The battery pack of claim 1 , wherein the laminate is disposed on the extrusion.

4. The laminate and the restraining member are arranged in a direction intersecting the lamination direction, The battery pack according to claim 1 , wherein each of the restraining members is disposed opposite to each other.

5. The battery pack according to claim 1 , wherein the extruded material includes a fluid passage through which a heat transfer medium passes, the fluid passage extending in the extrusion direction.

6. The battery pack is mounted on a vehicle, The battery pack according to claim 1 , wherein the battery pack is arranged such that a direction intersecting the stacking direction is oriented in a front-rear direction of the vehicle.

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