Battery pack

Abstract

The invention provides a battery pack capable of suppressing thermal interlocking during thermal runaway of battery cells in a battery module capable of suppressing an increase in the weight of the battery module and improving the mounting efficiency. The battery pack includes a case, a battery module disposed in the case, and a cover covering an upper portion of the battery module. A battery module is provided with: a laminate in which a plurality of rechargeable batteries are laminated; and a side restraint member facing the first surface of the laminate and extending in the lamination direction of the laminate. The first surface is a surface in the vertical direction with respect to the lower surface of the laminated body and is a surface in the lamination direction, and a first distance between the upper end of the side restraining member and the cover is shorter than a second distance between the upper surface of the laminated body and the cover.

Description

Technical Field

[0001] The present invention relates to batteries. Background Art

[0002] In recent years, in order to make it possible for more people to have reliable, sustainable and secure access to advanced energy, research and development of rechargeable batteries that contribute to improving energy efficiency has been conducted.

[0003] Patent Document 1 discloses a stacked body formed by stacking a plurality of battery cells (rechargeable batteries), a pair of connecting rods, and a pair of end plates as a structure of a battery module. The pair of connecting rods is a member that constrains the stacking direction of the plurality of battery cells, and the pair of end plates is a member that constrains the width direction of the battery cells (a direction intersecting the stacking direction). The pair of connecting rods and the pair of end plates are components mainly for the purpose of maintaining and protecting the stacked body of the plurality of battery cells.

[0004] A battery pack is formed by mounting (arranging) multiple battery modules in a frame (housing) for protecting the multiple battery modules from external forces. In the frame of the battery pack, structural members such as crossbeams and side frames are provided for the purpose of ensuring strength and rigidity, external force resistance, and connection with the vehicle.

[0005] The cross beam is a structural member extending in the stacking direction of the multiple battery cells in the frame, and is a structural member extending in the same direction as the connecting rod that constrains the multiple battery cells in the stacking direction. In addition, the side frame is a structural member extending in the arrangement direction of the multiple battery cells in the frame (a direction intersecting the stacking direction), and is a structural member extending in the same direction as the end plate that constrains the width direction of the battery cells.

[0006] The cross member and the side frame contribute to the strength and rigidity of the battery pack frame in the vehicle front-rear direction and the vehicle left-right direction, and the external force resistance performance. The cross member and the side frame hold and protect the plurality of battery modules in the frame.

[0007] Prior art literature

[0008] Patent Literature

[0009] Patent Document 1: International Publication No. 2019 / 167689 Summary of the invention

[0010] Problems to be solved by the invention

[0011] However, if the structural components (cross beams, side frames) provided in the frame and the structural components (connecting rods, end plates) constituting the battery modules are provided independently, this may be inefficient from the perspective of cost, weight, and ensuring space for mounting the battery modules in the frame.

[0012] If the battery modules are fixed by connecting rods and end plates and a plurality of battery modules are held by cross members and side frames to ensure strength, rigidity, and resistance to external forces, the weight of the battery modules increases, and therefore it is required to suppress the increase in weight.

[0013] In addition, since the structural members (connecting rods, end plates) and structural members (crossbeams, side frames) provided in the frame (hereinafter also referred to as the shell) constituting the battery module partially occupy the mounting space of the battery cell in the shell, it is required to improve the mounting efficiency of the battery module including the rechargeable battery. In addition, in a battery pack including multiple battery modules, it is required to suppress the thermal linkage when the battery cell thermal runaway occurs.

[0014] Means used to solve problems

[0015] In view of the above problems, the present application provides a battery pack capable of suppressing thermal linkage during thermal runaway of a battery cell in a battery module capable of suppressing an increase in weight of the battery module and improving mounting efficiency.

[0016] A battery pack according to one embodiment of the present invention is a battery pack including a housing, a battery module disposed in the housing, and a cover covering the upper side of the battery module, wherein:

[0017] The battery module comprises:

[0018] A stacked body formed by stacking a plurality of rechargeable batteries; and

[0019] a side restraining member disposed opposite to the first surface of the stack and extending along the stacking direction of the stack,

[0020] The first surface is a surface in a vertical direction relative to the lower surface of the stacked body and is a surface along the stacking direction.

[0021] A first distance between an upper end of the side restraint member and the cover is shorter than a second distance between an upper surface of the stacked body and the cover.

[0022] Technical Effects

[0023] According to the present invention, it is possible to provide a battery pack capable of suppressing thermal linkage during thermal runaway of a battery cell in a battery module capable of suppressing an increase in weight of the battery module and improving mounting efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a diagram schematically illustrating the configuration of a battery module and a battery module group according to an embodiment.

[0025] Figure 2 It is a diagram for explaining the joining structure between the battery cell and the side restraint member according to the embodiment.

[0026] Figure 3 It is a diagram for explaining a structure in which a battery module group according to an embodiment is arranged in a case.

[0027] Figure 4 It is a diagram showing a connection structure example 1 for connecting end restraining members according to the embodiment.

[0028] Figure 5 This is a diagram showing a second connection structure example for connecting end restraining members according to the embodiment.

[0029] Figure 6 This is a diagram showing a connection structure example 3 for connecting end restraining members according to the embodiment.

[0030] Figure 7 It is a diagram illustrating a cross-sectional structure of a battery cell according to an embodiment.

[0031] Figure 8 It is a diagram for explaining the thermal linkage prevention structure of the battery pack according to the second embodiment.

[0032] Fig. 9 It is a diagram for explaining the thermal linkage prevention structure of the battery pack according to the third embodiment.

[0033] Description of Reference Numerals

[0034] 100: battery cell (rechargeable battery); 110: laminate; 200: side restraint member; 231: flange; 232: flange; 300: end restraint member; 310: long end restraint member; 331: step; 332: step; 400: shell (battery shell); 410: cover; 415: protrusion; 450: frame; 455: reinforcement; 500: battery pack. DETAILED DESCRIPTION

[0035] Hereinafter, the embodiments are described in detail with reference to the accompanying drawings. In addition, the following embodiments do not limit the invention involved in the technical solution. In addition, the combination of features described in the embodiments may not all be necessary for the invention. Two or more of the multiple features described in the embodiments may also be combined arbitrarily. In addition, the same or similar configurations are marked with the same reference numerals, and repeated descriptions are omitted.

[0036] [Implementation Method]

[0037] <Battery Module 110, Battery Module Group 115>

[0038] Figure 1 The diagram schematically illustrates the configuration of a battery module 110 and a battery module group 115 according to the embodiment.

[0039] exist Figure 1 In Figure 1 As shown in A, a plurality of battery cells 100 (rechargeable batteries) are arranged in the X direction (stacking direction) to form a stacked body 111 of a plurality of battery cells 100. A heat insulating material (not shown) may be arranged between the battery cells 100 arranged in the X direction.

[0040] exist Figure 1 In the embodiment, the X direction (stacking direction) of the stack 111 is set as the first direction. In addition, the plane (XZ plane: first plane 101) of the plurality of battery cells 100, that is, the direction (Y direction) intersecting the plane (XZ plane: first plane 101) of the battery module 110 (stack 111) is set as the second direction (intersecting direction). The direction intersecting the first direction and the second direction is set as the third direction (vertical direction).

[0041] In addition, the surface of the battery cell 100 in the X direction and the Z direction (XZ surface) and the surface of the battery module 110 (stack 111) (XZ surface) are set as the first surface 101, and the surface of the battery cell 100 in the Y direction and the Z direction (YZ surface) and the surface of the battery module 110 (stack 111) (YZ surface) are set as the second surface 102.

[0042] The first surface 101 is a surface in a vertical direction relative to the lower surface (XY surface) of the battery module 110 (stack 111), and is a surface along the stacking direction. In addition, the second surface 102 is a surface in a vertical direction relative to the lower surface (XY surface) of the battery module 110 (stack 111), and is a surface intersecting the stacking direction. Here, the lower surface (XY surface) of the stack 111 is the stack 111 configured in the shell 400 (battery shell: Figure 3 ) face.

[0043] The surface (XZ surface) of the battery module 110 (stack 111) is a surface formed by the surfaces (XZ surface: first surface 101) of the plurality of battery cells 100. In addition, the surface (YZ surface) of the battery module 110 (stack 111) is a surface in the Y direction and the Z direction (YZ surface: second surface 102) of the battery cells 100 arranged at the end of the plurality of battery cells 100 constituting the stack 111.

[0044] like Figure 1 As shown in FIG. 1B , the side restraint members 200 ( 200 a , 200 b ) face the first surface 101 (XZ plane) of the battery module 110 (stacked body 111 ) and extend in the X direction (stacking direction) of the stacked body 111 .

[0045] The first surface 101 (XZ surface) of each battery cell 100 constituting the stacked body 111 and the side restraint members 200 ( 200 a , 200 b ) are joined by a joining member.

[0046] Figure 2 It is a diagram for explaining the joining structure between the battery cell 100 and the side restraint member 200 . Figure 2 This is a view of the battery cell 100 observed from the YZ plane (the second surface 102), in which an insulating film 702 is provided between the bonding member 701 (for example, an adhesive, a double-sided tape) and the battery cell 100. The insulating film 702 is provided in a manner that covers a portion of the lower surface and the upper surface of the battery cell 100 in addition to covering the interface with the bonding member 701. The type of the insulating film 702 is not particularly limited, and may be a resin material. As a resin material, for example, polyethylene terephthalate (PET), polytetrafluoroethylene (PTFE), etc. may be included.

[0047] The gap between the battery cell 100 and the housing 400 (battery housing) is filled with a filler 703. The type of filler 703 is not particularly limited, and may be a resin material. The insulating film 702 and the filler 703 may also use flame-retardant components so that they can cope with the situation even when the battery cell 100 is exposed to high temperatures due to thermal runaway.

[0048] When an adhesive material is used as the joining member 701, it is sufficient to fill the first surface 101 (XZ surface) and the side restraining member 200 with an adhesive and join them. The type of the adhesive material is not particularly limited, and examples thereof include acrylic resin, polyurethane resin, silicone resin, epoxy resin, and olefin resin.

[0049] When viewed from the side of the YZ plane (the second plane 102), the side restraint member 200 joined to the left side of the paper of the battery cell 100 is described as the side restraint member 200 (200a). In addition, the side restraint member 200 joined to the right side of the paper of the battery cell 100 is described as the side restraint member 200 (200b). The description "side restraint member 200" or "side restraint member 200 (200a, 200b)" is a general term for the side restraint member 200 (200a) and the side restraint member 200 (200b).

[0050] In addition, the first surface 101 (XZ surface) on the left side of the paper of the battery cell 100 is described as the first surface 101 (101a), and the first surface 101 (XZ surface) on the right side of the paper of the battery cell 100 is described as the first surface 101 (101b). The description such as "first surface 101" or "first surface 101 (XZ surface)" is a general term for the first surface 101 (101a) and the first surface 101 (101b).

[0051] The first surface 101 ( 101 a ) and the first surface 101 ( 101 b ) of the battery cell 100 have the same joint structure.

[0052] exist Figure 2 Among the battery cells 100 shown, the battery cells 100 shown by the dotted lines represent other battery cells 100 arranged adjacent to the battery cells 100 shown by the solid lines in the Y direction. The side restraints 200 (200b) shown by the dotted lines are joined to the battery cells 100 by the same joining structure as the side restraints 200 (200a).

[0053] exist Figure 2 In the figure, the side restraint member 200 (200a) faces the first surface 101 (101a) at one end side in the Y direction, and the side restraint member 200 (200b) faces the first surface 101 (101b) at the other end side in the Y direction.

[0054] The side restraint members 200 (200a, 200b) are plate-shaped members made of metal such as aluminum, aluminum alloy, copper, iron, iron alloy, stainless steel, etc. The shape of the side restraint members 200 (200a, 200b) is not particularly limited as long as they can hold and restrain the first surface 101 (101a, 101b: XZ surface) of each battery cell 100 constituting the battery module 110 (stacked body 111).

[0055] like Figure 1 1B and Figure 2 As shown, when observed from the side of the YZ plane (the second plane 102), a pair of side restraint members 200 (200a, 200b) are opposite to the first plane 101 (101a) on one end side of the Y direction of the YZ plane (the second plane 102) of the stack 111 (battery cell 100) and the first plane 101 (101b) on the other end side of the Y direction, and extend in the stacking direction of the stack 111 (battery cell 100).

[0056] The side restraint members 200 ( 200 a , 200 b ) hold and restrain the battery modules 110 (stacked body 111 ) in the stacking direction (X direction: first direction), and impart strength and rigidity to the battery modules 110 (stacked body 111 ), thereby functioning as members for protecting the battery modules 110 .

[0057] like Figure 1 As shown in FIG1C , in the housing in which the battery module 110 (stacked body 111) is arranged ( Figure 3 400 ), a plurality of battery modules 110 (stacked body 111 ) are arranged in a second direction (Y direction) which is a vertical direction relative to the lower surface of the stacked body 111 and intersecting with the stacking direction.

[0058] The side restraint members 200 (200a, 200b) and the Figure 3 The side restraint members 200 of other battery modules 110 arranged adjacent to each other are opposite in the second direction.

[0059] For example, the side restraint member 200 (eg, Figure 2 solid line) and the side restraint members 200 (for example, Figure 2 The dashed line) is arranged in the shell 400 in a state of being opposite to each other in the second direction.

[0060] like Figure 1 As shown in FIG1D , the battery module 110 further includes an end restraint member 300 that holds the YZ surface (second surface 102 ) of the battery module 110 (stacked body 111 ) and is connected to the side restraint member 200 .

[0061] exist Figure 1 In 1D, when viewed from the side of the XZ plane (first surface 101), the end restraint member 300 on the right side of the paper of the battery module 110 is recorded as the end restraint member 300 (300a). In addition, the end restraint member 300 on the left side of the paper of the battery module 110 is recorded as the end restraint member 300 (300b). The description "end restraint member 300" or "end restraint member 300 (300a, 300b)" is a general term for the end restraint member 300 (300a) and the end restraint member 300 (300b).

[0062] In addition, the end restraint members 300 of each battery module 110 are connected to the end restraint members 300 of other battery modules 110 arranged adjacently along the second direction (Y direction) to form a long strip end restraint member 310. The long strip end restraint member 310 on the right side of the paper of the battery module 110 is recorded as a long strip end restraint member 310 (310a). In addition, the long strip end restraint member 310 on the left side of the paper of the battery module 110 is recorded as a long strip end restraint member 310 (310b). The description of "long strip end restraint member 310" or "long strip end restraint member 310 (310a, 310b)" represents the general term for the long strip end restraint member 310 (310a) and the long strip end restraint member 310 (310b).

[0063] In addition, when the side view of the XZ plane (first plane 101) is taken, the second plane 102 (YZ plane) on one end side of the battery module 110 in the X direction is referred to as the second plane 102 (102a), and the second plane 102 (YZ plane) on the other end side in the X direction is referred to as the second plane 102 (102b). The descriptions such as "second plane 102 (YZ plane)" or "second plane 102 (102a, 102b)" are collective names for the second plane 102 (102a) and the second plane 102 (102b).

[0064] The end restraining member 300 is a plate-shaped member made of a metal such as aluminum, aluminum alloy, copper, iron, iron alloy, stainless steel, etc. The shape of the end restraining member 300 is not particularly limited as long as it can hold and restrain the second surface 102 (YZ surface) of the battery module 110 (stacked body 111).

[0065] exist Figure 1 In 1D, when viewed from the side in the XZ plane direction, a pair of end restraining members 300 (300a, 300b) are extended and arranged to face the second surface 102 (102a) on one end side in the X direction and the second surface 102 (102b) on the other end side in the X direction of the battery module 110. That is, the end restraining member 300 (300a) faces the second surface 102 (102a) on one end side in the X direction, and the end restraining member 300 (300b) faces the second surface 102 (102b) on the other end side in the X direction.

[0066] The end restraining member 300 holds and restrains the arrangement direction (Y direction: second direction) of the battery module 110 (stacked body 111 ), and imparts strength and rigidity to the battery module 110 (stacked body 111 ), thereby functioning as a member for protecting the battery module 110 .

[0067] The end restraint members 300 (300a, 300b) of each battery module 110 are connected and extended along the second direction (Y direction). The end restraint members 300 (300a, 300b) connected along the second direction (Y direction) are configured as long end restraint members 310 (310a, 310b). The long end restraint members 310 (310a, 310b) can maintain and restrain the configuration direction (Y direction: second direction) of the assembly (battery module group 115) of multiple battery modules 110, and provide strength and rigidity to the battery module group 115, thereby functioning as a member for protecting the battery module group 115. Refer to Figures 4 to 6 A connection structure for connecting the end restraining member 300 will be described.

[0068] Figure 1 Reference numeral 1E represents an aggregate (battery module group 115 ) of battery modules 110 in which a plurality of battery modules 110 are arranged along an arrangement direction (Y direction: second direction).

[0069] exist Figure 1 In 1E, six battery modules 110 are arranged, but the number of battery modules 110 constituting the battery module group 115 is arbitrary. The electrical components 116 are mounted on each battery module 110 constituting the battery module group 115. The electrical components 116 include, for example, a conductive member (bus bar) that electrically connects the terminals between the battery cells 100 constituting the stack 111, a voltage detection line that detects the voltage from each battery cell 100, and the like.

[0070] In the battery module group 115, the side restraint members 200 (200a, 200b) of each battery module 110 hold and restrain the stacking direction (X direction: first direction) of the battery module 110 (stacked body 111), and provide strength and rigidity to the battery module 110 (stacked body 111), and can function as a member for protecting the battery module 110. That is, in the battery module group 115 composed of a plurality of battery modules 110, the side restraint members 200 (200a, 200b) have the function of integrating the horizontal beam of the frame (casing) in the prior art with the connecting rod constituting the battery module.

[0071] In the prior art, the functions performed by the beams of the frame (housing) and the functions performed by the connecting rods can be integrated into the side restraint members 200 ( 200 a , 200 b ) in the battery module 110 and the battery module group 115 of the present embodiment.

[0072] In addition, the long end restraint members 310 (310a, 310b) can serve as components for maintaining the configuration direction (Y direction: second direction) of the collection of multiple battery modules 110 (battery module group 115), restraining the battery module group 115, and imparting strength and rigidity to the battery module group 115, thereby protecting the battery module group 115.

[0073] The long end restraining members 310 (310a, 310b) have a function of integrating the side frame of a frame (casing) in the related art with the end plates constituting the battery module.

[0074] In the prior art, the functions of the side frames of the frame (housing) and the functions of the end plates can be integrated into the end restraining members 300 (300a, 300b) and the long end restraining members 310 (310a, 310b) in the battery module 110 and the battery module group 115 of this embodiment. As a result, the battery module 110 and the battery module group 115 composed of a plurality of battery modules 110 have sufficient strength and rigidity.

[0075] <Battery Pack 500>

[0076] The battery pack 500 is formed by mounting (arranging) a plurality of battery modules 110 (battery module group 115) in a housing 400 for protecting the plurality of battery modules 110 from external forces and covering the upper portion with a cover 410. The battery pack 500 can be mounted on, for example, an electric vehicle such as a hybrid car or EV (not shown).

[0077] Figure 3 4 is a diagram illustrating a structure in which a battery module group 115 is arranged in a housing 400 (battery housing). The housing 400 is a tray-shaped housing, and the bottom plate of the housing 400 can be formed of a member having insulation and excellent thermal conductivity. The fastening member 460 is a member for fixing the battery module group 115 to the housing 400, and includes, for example, a fastening bolt.

[0078] exist Figure 1 The end restraining member 300 (300a, 300b) described in the figure is formed with a hole portion (through hole) through which a fastening member 460 for fixing the battery module group 115 to the housing 400 can pass. For example, a screwing portion (for example, an internal thread) that is screwed with the fastening member 460 (for example, a fastening bolt) is formed in the housing 400. A control unit 420 that controls the power supplied from the battery module group 115 and an interface portion 430 including a connector for connecting to an external device are installed in the housing 400.

[0079] A frame 450 is installed on the lower surface of the housing 400 to reinforce the housing 400. The frame 450 is provided along one side of the housing 400 (for example, at Figure 2The frame 450 is a member extending from the housing 400 (the side in the Y direction). The frame 450 helps to improve the strength and rigidity of the housing 400. In order to achieve a lighter battery pack 500, the frame 450 may also be formed to extend upward (for example, in the Y direction) relative to the extending direction. Figure 2 The Z direction is a generally hollow structure formed with a reinforcing portion 455 such as a rib. The number of reinforcing portions 455 is not particularly limited, as long as at least one reinforcing portion 455 is formed. Figure 3 In the example, the frame 450 is shown to be extended along the Y direction of the housing 400, but the extending direction of the frame 450 is not limited to the Y direction, and the frame 450 may be further extended along the X direction.

[0080] The frame fastening member 470 is a member for fixing the frame 450 to the housing 400, and includes, for example, a fastening bolt. The frame 450 is formed with a hole (through hole) through which the frame fastening member 470 for fixing the frame 450 to the housing 400 can pass. The housing 400 is formed with, for example, a screwing portion (for example, an internal thread) that is screwed with the frame fastening member 470 (for example, a fastening bolt).

[0081] The cover 410 is a member that covers the upper portion of the battery module group 115 (a plurality of battery modules 110 ) disposed in the housing 400 , and is fastened to the housing 400 by a fastening member (not shown). Thus, the battery module group 115 is sealed, and the battery pack 500 is formed.

[0082] In the structure of the battery module group 115, by integrating the functions of the structural members into the side restraint members 200 and the end restraint members 300, it is possible to reduce the weight of the battery module group 115. Furthermore, by integrating the functions of the structural members, it is possible to provide a battery pack 500 that can improve the loading efficiency of the battery modules 110 in the housing 400.

[0083] <Connection Structure Example 1>

[0084] The end restraint member 300 of each battery module 110 is connected to the end restraint member 300 of another battery module 110 arranged adjacently along the second direction (Y direction) to form a long end restraint member 310 .

[0085] Figure 4 1 is a diagram showing a connection structure example 1 for connecting the end restraining member 300 (300a) according to the embodiment. In the connection structure example 1, a connection structure using a connection pin 610 is described. Figure 4In the example of , the case where one end restraint member 300 (300a) is connected to another end restraint member 300 (300a) is described. The end restraint member 300 (300a) is connected to the other end restraint member 300 (300a) by fitting a connecting pin 610 that abuts against both the end restraint member 300 (300a) and the other end restraint member 300 (300a).

[0086] The YZ surface of one end restraining member 300 (300a) is formed with recesses 611 and 612 that fit with the connecting pin 610. By fitting the connecting pin 610 with the recess 611 (first fitting portion) in one end restraining member 300 (300a) and the recess 612 (second fitting portion) in the other end restraining member 300, one end restraining member 300 (300a) is connected to the other end restraining member 300 (300a).

[0087] When the connecting pin 610 is engaged with the recess 611 (first engaging portion) and the recess 612 (second engaging portion), each engaging portion may be formed into a different shape so that the engaging state of the recess 611 (first engaging portion) is different from the engaging state of the recess 612 (second engaging portion). For example, as a different shape, the opening size of the recess may be changed so that the dimensional tolerance is different.

[0088] When the connecting pin 610 is engaged with the recess 611 (first engaging portion) and the recess 612 (second engaging portion), each engaging portion may be formed with a surface roughness so that the engaging state of the recess 611 (first engaging portion) is different from the engaging state of the recess 612 (second engaging portion).

[0089] For example, the recessed portion 611 may be formed so as to achieve a tight fitting state (first fitting state) or the recessed portion 612 may be formed so as to achieve a loose fitting state (second fitting state) that is more relaxed than the first fitting state.

[0090] exist Figure 4 In the example, at least different types of recesses 611 and 612 are formed on the YZ surface of one end restraining member 300 (300a). That is, it is sufficient that the recess 611 for the first mating state and the recess 612 for the second mating state are formed on the YZ surface of one end restraining member 300 (300a).

[0091] The side restraint 200 (200a) in one battery module 110 is connected to (contacts) one end restraint 300 (300a). In addition, the side restraint 200 (200b) in another adjacent battery module 110 is connected to (contacts) another end restraint 300 (300a).

[0092] When the end restraint members 300 ( 300 a ) are connected to each other, the adjacent side restraint members 200 ( 200 a ) and side restraint members 200 ( 200 b ) are held in a state of being sandwiched between one end restraint member 300 ( 300 a ) and the other end restraint member 300 ( 300 a ).

[0093] The end restraining member 300 ( 300 a ) has a hole (through hole) through which the fastening member 460 can pass. The end restraining member 300 ( 300 a ) is connected to the case 400 in which the battery module 110 is arranged via the fastening member 460 .

[0094] The battery module 110 held on the XZ plane by the side restraints 200 ( 200 a , 200 b ) is held (connected) to the case 400 via the side restraints 200 ( 200 a , 200 b ) and the end restraints 300 ( 300 a , 300 b ).

[0095] Furthermore, in the end restraint member 300 ( 300 b ) on the other end side of the battery module 110 , the adjacent end restraint members 300 ( 300 b ) can be connected to each other in the same manner by the same connection configuration example 1.

[0096] In the connection structure using the connection pin 610, by setting one side to a tightly fitted state (first fitted state) and the other side to a loosely fitted state (second fitted state), the assembly performance when connecting the end restraining member 300 is improved. That is, even before the end restraining members 300 are connected to each other, the alignment of the side restraining members 200 in each battery module 110 becomes easy, and the positional relationship between the side restraining member 200 and the end restraining member 300 can be easily adjusted.

[0097] <Example 2 of continuous structure>

[0098] Figure 5 1 is a diagram showing a second example of a connection structure for connecting the end restraining member 300 (300a) according to the embodiment. In the second example of the connection structure, a connection structure using a reinforcement member 620 will be described. Figure 5 In the example, similarly to the connection configuration example 1, the example of connecting one end restraint member 300 (300a) and another end restraint member 300 (300a) will be described.

[0099] In connection configuration example 2, similarly to connection configuration example 1, the side restraint member 200 (200a) in one battery module 110 is connected (contacted) with one end restraint member 300 (300a). In addition, the side restraint member 200 (200b) in another adjacent battery module 110 is connected (contacted) with another end restraint member 300 (300a).

[0100] When the end restraint members 300 ( 300 a ) are connected to each other, the adjacent side restraint members 200 ( 200 a ) and side restraint members 200 ( 200 b ) are held in a state of being sandwiched between one end restraint member 300 ( 300 a ) and the other end restraint member 300 ( 300 a ).

[0101] like Figure 5 As shown, the reinforcement member 620 is a long reinforcement member extending in the Y direction, and the length of the reinforcement member 620 is arbitrary depending on the number of end restraining members 300 to be connected. Figure 5 In the illustrated example, a long reinforcing member 620 is provided on the upper surface (XY plane) of one end restraining member 300 ( 300 a ) and the other end restraining member 300 ( 300 a ).

[0102] The elongated reinforcement member 620, the end restraining member 300 (300a), and the other end restraining member 300 (300a) are provided with a hole (through hole) through which the fastening member 460 can pass. The elongated reinforcement member 620, the end restraining member 300, and the other end restraining member 300 (300a) are fastened together in the vertical direction (Z direction) by the fastening member 460 and connected to the housing 400, thereby connecting one end restraining member 300 (300a) to the other end restraining member 300 (300a).

[0103] Furthermore, in the end restraint member 300 ( 300 b ) on the other end side of the battery module 110 , the adjacent end restraint members 300 ( 300 b ) can be similarly connected to each other by the same connection configuration example 2.

[0104] In the connection configuration example 2, the battery module 110 held on the XZ plane by the side restraints 200 (200a, 200b) is also held (connected) to the case 400 via the side restraints 200 (200a, 200b) and the end restraints 300 (300a, 300b).

[0105] <Connection Structure Example 3>

[0106] Figure 6 FIG. 2 is a diagram showing a connection structure example 3 for connecting the end restraining member 300 according to the embodiment. In the connection structure example 3, a connection structure using a reinforcement member 630 will be described. Figure 6 In the example, similarly to the connection configuration example 1, the example of connecting one end restraint member 300 (300a) and another end restraint member 300 (300a) will be described.

[0107] In connection configuration example 3, one side restraint member 200 (200a) in one battery module 110 is also connected to (butted against) one end restraint member 300 (300a). In addition, other side restraint members 200 (200b) in other adjacent battery modules 110 are connected to (butted against) other end restraint members 300 (300a).

[0108] like Figure 6 As shown, in a side restraint member 200 (200a), a flange 232 (first flange) is formed at the end of the side restraint member 200 along the Y direction (Y+ direction), and a step 332 (first step) that can be connected (abutted) with the flange 232 is formed in an end restraint member 300 (300a).

[0109] In addition, in the other side restraint member 200 (200b), a flange 231 (second flange) is formed in the Y direction (Y-direction) at the end of the side restraint member 200, and in the other end restraint member 300 (300a), a step 331 (second step) that can be connected (abutted) with the flange 231 is formed.

[0110] The steps 331 and 332 are provided with screw-engaging portions 631 (for example, external threads) that are screw-engaged with a fastening member 632 (for example, a fastening nut).

[0111] like Figure 6 As shown, the reinforcement member 630 is a reinforcement member for reinforcing the YZ surface of the end restraining member 300 (300a).

[0112] Holes (through holes) through which the screwed portions 631 formed on the steps 331 and 332 can pass are formed in the reinforcement 630, the flanges 231 and 232. The reinforcement 630, the flanges 231 and 232 are fastened together with the steps 331 and 332 by the fastening member 632, thereby connecting one end restraining member 300 (300a) to the other end restraining member 300 (300a).

[0113] Furthermore, in the end restraint member 300 ( 300 b ) on the other end side of the battery module 110 , the adjacent end restraint members 300 ( 300 b ) can be similarly connected to each other by the same connection configuration example 3.

[0114] In the connection configuration example 3, the battery module 110 held on the XZ plane by the side restraints 200 (200a, 200b) is also held (connected) to the housing 400 via the side restraints 200 (200a, 200b) and the end restraints 300 (300a, 300b).

[0115] <Battery Cell>

[0116] Figure 7 It is a diagram showing a cross-sectional structure (XZ cross section) of a battery cell 100. The battery cell 100 (rechargeable battery) may be an all-solid-state battery.

[0117] In the coordinate system in the figure, the X-axis represents the length direction of the battery cell 100 (the extension direction of the lead tab), and the Z-axis represents the thickness direction of the battery cell 100 (the thickness direction of the electrode body 2 ).

[0118] The battery cell 100 has: an electrode body 2 (also referred to as a laminate in this embodiment) as a storage element in which a positive electrode layer, a solid electrolyte layer and a negative electrode layer are stacked; an outer casing 18 that seals the periphery of the accommodated electrode body 2; lead terminals 13 and 14; and current collector terminals 15 and 16.

[0119] The positive electrode layer and the negative electrode layer of the electrode body 2 have a two-layer structure. The positive electrode layer has two positive electrode layers 21 and 23, and the negative electrode layer has two negative electrode layers 22 and 24. A solid electrolyte layer 25 is provided between the positive electrode layer 21 and the negative electrode layer 22. A solid electrolyte layer 25 is also provided between the positive electrode layer 23 and the negative electrode layer 24. In addition, the positive electrode layer and the negative electrode layer may be single-phase (one-phase) or may be composed of multiple layers. In the case where a plurality of positive electrode layers and negative electrode layers are provided, as Figure 7 As shown in FIG. 1 , a solid electrolyte layer is provided between each positive electrode layer and each negative electrode layer. Figure 7 In the example of FIG. 1 , a structure of two layers of a positive electrode layer and a negative electrode layer is illustrated, but the present invention is not limited to this example, and the positive electrode layer and the negative electrode layer may be three or more layers.

[0120] The positive electrode layers 21 and 23 respectively include a positive electrode active material layer 711 and a positive electrode collector 712. The positive electrode collector 712 is common to the two positive electrode layers 21 and 23. The positive electrode collector 712 is arranged at the center of the thickness direction (Z direction) of the electrode body 2, and the positive electrode active material layer 711 of the positive electrode layer 21 and the positive electrode active material layer 711 of the positive electrode layer 23 are stacked on the upper surface side and the lower surface side of the positive electrode collector 712.

[0121] The negative electrode layer 22 is arranged (stacked) on the upper surface side of the electrode body 2 in the thickness direction (Z direction) relative to the positive electrode layer 21, and the negative electrode layer 24 is arranged (stacked) on the lower surface side of the electrode body 2 in the thickness direction (Z direction) relative to the positive electrode layer 23. The negative electrode layers 22 and 24 are stacked in a manner of sandwiching the positive electrode layer 21 and the positive electrode layer 23. The negative electrode layers 22 and 24 respectively have a negative electrode active material layer 721 and a negative electrode collector 722. The two negative electrode collectors 722 are respectively formed in layers on the outermost layers of the electrode body 2. In addition, the structure of the positive electrode layer and the negative electrode layer is not limited to Figure 7 The stacking order shown may also be a structure in which two positive electrode layers are stacked so as to sandwich two negative electrode layers.

[0122] Examples of the active material constituting the positive electrode active material layer 711 include NCM-based (ternary active material) materials in which cobalt, nickel, and manganese are mixed, such as lithium cobalt oxide, lithium nickel oxide, and lithium manganese oxide.

[0123] In addition, as active materials constituting the negative electrode active material layer 721, for example, lithium-based materials, silicon-based materials, etc. As materials constituting the negative electrode active material layer 721, in addition, carbon materials such as graphite, soft carbon and hard carbon, tin-based materials, transition metal oxides (such as lithium titanate: LTO), etc. can also be mentioned.

[0124] The solid electrolyte layer 25 is composed of, for example, a solid electrolyte having ion conductivity, and examples of the material thereof include sulfide-based solid electrolyte materials, oxide-based solid electrolyte materials, nitride-based solid electrolyte materials, and halide-based solid electrolyte materials.

[0125] The positive electrode collector 712 and the negative electrode collector 722 are composed of metal foil, metal sheet or metal plate such as aluminum, copper, SUS, etc. The positive electrode active material layer 711, the negative electrode active material layer 721, and the solid electrolyte layer 25 can also be formed by combining the particles of the substances constituting them using an organic polymer compound-based binder. The positive electrode active material layer 711 or the negative electrode active material layer 721 may contain an electronic conductive additive such as carbon (particles, fibers), metal powder, etc. In the positive electrode active material layer 711 or the negative electrode active material layer 721, solid electrolyte powder may also be configured to construct an ion conductive path.

[0126] The outer packaging member 18 is a container for housing the electrode assembly 2. The outer packaging member 18 is formed by folding a sheet of raw material into two or bonding a plurality of sheet-like raw materials together. The raw material of the outer packaging member 18 is formed, for example, by covering the front and back surfaces of a metal layer with an insulating layer.

[0127] One end of the lead tab 13 is located outside the outer casing 18, and the other end is located inside the outer casing 18. The other end of the lead tab 13 is connected to the positive electrode current collector 712 via the current collector tab 15 inside the outer casing 18, and the lead tab 13 forms a tab for the positive electrode. The lead tab 13 and the current collector tab 15 are formed of, for example, a conductive metal sheet or metal plate.

[0128] One end of the lead tab 14 is located outside the outer member 18, and the other end is located inside the outer member 18. The other end of the lead tab 14 is connected to the negative electrode current collector 722 via the current collector tab 16 inside the outer member 18, and the lead tab 14 forms a tab for the negative electrode. The lead tab 14 and the current collector tab 16 are formed of, for example, a conductive metal sheet or metal plate. By connecting the lead tabs 13 and 14 to a charger or an electric load, the electrode body 2 can be charged or discharged.

[0129] [Implementation Method 2]

[0130] In the second embodiment, the structure for preventing thermal linkage in the battery pack 500 described in the previous embodiment (hereinafter referred to as thermal linkage prevention structure) will be described. Figure 8 It is a diagram for explaining the thermal linkage prevention structure of the battery pack 500 according to the second embodiment. Figure 8 The figure shows a YZ cross section of the battery pack 500. Focusing on one battery module 110 in the battery module group 115, the figure shows the battery modules 110 arranged adjacent to the battery module 110 in the Y direction.

[0131] exist Figure 8 , the battery module 110 (stack 111) is shown as being arranged in the housing 400 and covered by the cover 410 from above, but this is also the arrangement state of the battery cell 100 in the YZ cross section. The first surface 101 (101a, 101b) is a surface in a vertical direction relative to the lower surface 103 of the battery module 110 (stack 111), and is a surface along the stacking direction (direction perpendicular to the paper surface).

[0132] The side restraint members 200 (200a, 200b) are opposite to the first surface 101 (101a, 101b) of the battery module 110 and extend in the stacking direction. The first surface 101 (101a, 101b) and the side restraint members 200 (200a, 200b) are joined by the joining member 701 ( Figure 7 ).

[0133] The first distance (eg, Figure 8 The first distance 810 is shorter than the second distance 820 between the upper surface of the battery module 110 (stack 111, battery cell 100) and the cover 410. The side restraint members 200 (200a, 200b) and the battery module 110 (stack 111, battery cell 100) are formed to satisfy this positional relationship (first distance 810 < second distance 820).

[0134] like Figure 8As shown, for example, the first distance 810 may be the distance when the upper end of the side restraining member 200 (200a, 200b) is in contact with the cover 410. In addition, if the above-mentioned positional relationship is satisfied, the first distance 810 may be the distance when the upper end of the side restraining member 200 (200a, 200b) is separated from the cover 410 by a predetermined gap in the Z direction (vertical direction).

[0135] In the housing 400, a plurality of battery modules 110 are arranged in a direction (Y direction: intersecting direction) intersecting the XZ plane (first surface 101) of the stack 111. Figure 8 As shown, the side restraint member (eg, 200 ( 200 a )) is arranged to be opposed to other side restraint members (eg, 200 ( 200 b )) of other battery modules 110 arranged adjacent to each other in the housing 400 in the intersecting direction.

[0136] The positional relationship between the first distance 810 and the second distance 820 (first distance 810<second distance 820) is also the same for the other side restraint members (200(200b)) in the other battery modules 110 arranged adjacently.

[0137] According to the thermal linkage prevention structure of the second embodiment, even when the battery cell 100 constituting the battery module 110 is in thermal runaway, the flow of the gas or the ejected material ejected from the battery cell 100 is suppressed by the side restraint member 200. Therefore, it is possible to suppress the ejected gas or the ejected material from flowing into the other battery cells 100 disposed adjacent to the side restraint member 200 in the cross direction. The side restraint member 200 functions as a fireproof wall surface, and can suppress and prevent the thermal linkage of the battery cell 100.

[0138] [Implementation method 3]

[0139] In the third embodiment, another thermal linkage prevention structure in the battery pack 500 described in the previous embodiment will be described. Fig. 9 It is a diagram for explaining a thermal linkage prevention structure of a battery pack 500 according to the third embodiment.

[0140] Fig. 9 2 shows a YZ cross section of the battery pack 500. Figure 8 Similarly, focusing on one battery module 110 in the battery module group 115, the battery modules 110 arranged adjacent to the battery module 110 in the Y direction are shown. Fig. 9 , the battery module 110 (stacked body 111 ) is shown as being arranged in the case 400 and covered by the cover 410 from above, but this is also the arrangement state of the battery cells 100 in the YZ cross section.

[0141] Similar to the second embodiment, the first surface 101 (101a, 101b) is a surface that is perpendicular to the lower surface 103 of the battery module 110 (stacked body 111) and is along the stacking direction (direction perpendicular to the paper surface). The side restraint member 200 (200a, 200b) is opposite to the first surface 101 (101a, 101b) of the battery module 110 and extends along the stacking direction. The first surface 101 (101a, 101b) and the side restraint member 200 (200a, 200b) are joined by the joining member 701 ( Figure 7 ).

[0142] In the other thermal linkage prevention structure in the third embodiment, similarly to the second embodiment, the side restraint members 200 (200a, 200b) and the battery module 110 (stacked body 111, battery cell 100) may be formed so as to satisfy the positional relationship between the first distance 810 and the second distance 820 (first distance 810 < second distance 820). That is, the first distance 810 between the upper end of the side restraint member 200 (200a, 200b) and the cover 410 may be shorter than the second distance 820 between the upper surface of the battery module 110 (stacked body 111) and the cover 410.

[0143] exist Fig. 9 In the figure, the first distance 810 indicates that the upper end of the side restraint member 200 (200a, 200b) is separated from the cover 410 by a predetermined gap, but the cover 410 may be formed in a labyrinth-like manner with the predetermined gap. Figure 8 As shown, the first distance 810 may be a distance when the upper end of the side restraint member 200 ( 200 a , 200 b ) is in contact with the cover 410 .

[0144] In the housing 400, a plurality of battery modules 110 are arranged in a direction (Y direction: intersecting direction) intersecting the XZ plane (first surface 101) of the stack 111. Fig. 9 As shown, the side restraint member (e.g., 200 (200a)) is arranged in a state of being opposed to other side restraint members (e.g., 200 (200b)) of other battery modules 110 arranged adjacently in the housing 400 in the cross direction. The positional relationship between the first distance 810 and the second distance 820 is also the same for other side restraint members (200 (200b)) of other battery modules 110 arranged adjacently.

[0145] like Fig. 9As shown, a plurality of protrusions 415 extending downward toward the battery module 110 (laminated body 111, battery cell 100) are formed on the cover 410 at positions separated along the Y direction. For example, when the cover 410 is made of flame-retardant resin, the plurality of protrusions 415 can be formed integrally with the cover 410. In addition, when the cover 410 is formed by stamping a metal plate, the plurality of protrusions 415 can be formed separately and attached to the cover 410 by welding or the like.

[0146] Fig. 9 The side restraint member 200 (200a) on the left side of the paper and other side restraint members 200 (200b) of other battery cells 100 arranged adjacent to each other in the cross direction are located between the plurality of protrusions 415. Fig. 9 The side restraint member 200 ( 200 b ) on the right side of the illustrated paper and other side restraint members 200 ( 200 a ) of other battery cells 100 arranged adjacent to each other in the intersecting direction are located between the plurality of protrusions 415 .

[0147] The lower ends 416 of the plurality of protrusions 415 are extended so as to be closer to the battery module 110 (stacked body 111, battery cell 100) than the upper ends 910a of the side restraint members 200 (200a, 200b) and the upper ends 910b of the other side restraint members 200 (200b, 200a). The side restraint members 200 (200a, 200b), the plurality of protrusions 415, and the battery module 110 (stacked body 111, battery cell 100) are formed to satisfy this positional relationship.

[0148] like Fig. 9 As shown, the positional relationship between the side restraint member 200 (200a, 200b) located between the plurality of protrusions 415 and the plurality of protrusions 415 in the Y direction (cross direction) may also be a state of being separated by a predetermined gap. When the side restraint member 200 and other side restraint members 200 are located between the plurality of protrusions 415, the side restraint member 200 and other side restraint members 200 are arranged at a position separated from the plurality of protrusions 415 in the Y direction (cross direction). The plurality of protrusions 415 may be formed in a manner such that the predetermined gap in the Y direction (cross direction) becomes a maze.

[0149] In addition, not limited to Fig. 9 For example, the positional relationship between the side restraint member 200 and the plurality of protrusions 415 in the Y direction (cross direction) may also be in abutment. When the side restraint member 200 and the other side restraint members 200 are located between the plurality of protrusions 415, the side restraint member 200 and the other side restraint members 200 may also be arranged at a position in abutment with the plurality of protrusions 415 in the Y direction (cross direction).

[0150] According to the thermal linkage prevention structure of the third embodiment, even when the battery cell 100 constituting the battery module 110 is in thermal runaway, the flow of the gas or the ejected material ejected from the battery cell 100 is suppressed by the side restraining member 200. Therefore, it is possible to suppress the ejected gas or the ejected material from flowing into the other battery cell 100 side arranged adjacent to the side restraining member 200 in the cross direction. The side restraining member 200 functions as a fireproof wall surface, and can suppress and prevent the thermal linkage of the battery cell 100.

[0151] <Summary of implementation methods>

[0152] The above-mentioned embodiments disclose at least the following battery packs.

[0153] (Item 1) The battery pack of the above embodiment is a battery pack (500) including a housing (400), a battery module (110) arranged in the housing, and a cover (410) covering the upper side of the battery module, wherein:

[0154] The battery module (110) comprises:

[0155] A stacked body (111) formed by stacking a plurality of rechargeable batteries; and

[0156] a side restraining member (200) disposed opposite to the first surface (101) of the stacked body and extending along the stacking direction of the stacked body,

[0157] The first surface (101) is a surface in a vertical direction relative to the lower surface (103) of the stacked body and is a surface along the stacking direction.

[0158] A first distance (810) between an upper end of the side restraint member and the cover is shorter than a second distance (820) between an upper surface of the stack and the cover.

[0159] According to the battery pack of item 1, it is possible to provide a battery pack capable of suppressing thermal linkage during thermal runaway of a battery cell in a battery module capable of suppressing an increase in weight of the battery module and improving mounting efficiency.

[0160] (Item 2) The first distance (810) is a distance when the upper end of the side restraint member is in contact with the cover, or a distance when the upper end is separated from the cover in the vertical direction.

[0161] According to the battery pack of item 2, even when the battery cell 100 constituting the battery module 110 thermally runs away, the flow of the gas or the ejected matter ejected from the battery cell 100 is suppressed by the side restraining member 200. Therefore, it is possible to suppress the ejected gas or the ejected matter from flowing into the other battery cells 100 disposed adjacently in the cross direction with respect to the side restraining member 200. The side restraining member 200 functions as a fireproof wall surface, and can suppress and prevent the thermal chain reaction of the battery cell 100.

[0162] (Item 3) The first surface (101) and the side restraint member (200) are joined by a joining member.

[0163] According to the battery pack of item 3, the functions performed by the beams of the frame (housing) and the functions performed by the connecting rods in the prior art can be integrated into the side restraint members 200 (200a, 200b) in the battery module 110 and the battery module group 115 of this embodiment.

[0164] (Item 4) The battery modules (110) are arranged in plurality along a direction (Y direction) intersecting the first surface (XZ surface) of the stacked body,

[0165] The side restraint member (200) is arranged to be opposed to other side restraint members of other battery modules arranged adjacent to each other in the housing in the intersecting direction.

[0166] According to the battery pack of item 4, the functions of the beam of the frame (housing) and the functions of the connecting rod in the prior art can be integrated into the side restraint members 200 (200a, 200b) in the battery module 110 and the battery module group 115 of this embodiment. By integrating the functions of the structural members, a battery pack 500 that can improve the loading efficiency of the battery module 110 in the housing 400 can be provided.

[0167] (Item 5) The cover (410) has a plurality of protrusions (415) extending downward toward the battery module at positions separated along the intersecting direction,

[0168] The side restraining member (200) and the other side restraining members (200) are located between the plurality of protrusions (415).

[0169] (Item 6) The lower ends (416) of the plurality of protrusions are extended so as to be located closer to the battery module (110) than the upper ends (910a, 910b) of the side restraint member and the other side restraint members.

[0170] (Item 7) In a state of being located between the plurality of protrusions (415), the side restraint member (200) and the other side restraint member (200) are arranged at positions separated from the plurality of protrusions (415) in the intersecting direction.

[0171] (Item 8) In a state where the side restraint member (200) and the other side restraint member (200) are located between the plurality of protrusions (415), the side restraint member (200) is arranged at a position abutting against the plurality of protrusions (415) in the intersecting direction.

[0172] According to the battery pack of items 5 to 8, even when the battery cell 100 constituting the battery module 110 is in thermal runaway, the flow of the gas or the ejected material ejected from the battery cell 100 is suppressed by the side restraining member 200. Therefore, it is possible to suppress the ejected gas or the ejected material from flowing into the other battery cells 100 disposed adjacently in the cross direction with respect to the side restraining member 200. The side restraining member 200 functions as a fireproof wall surface, and can suppress and prevent the thermal chain reaction of the battery cell 100.

[0173] The present invention is not limited to the above-described embodiments, and various modifications and changes can be made within the scope of the gist of the present invention.

Claims

1. A battery pack comprising a housing, a battery module disposed in the housing, and a cover covering the upper side of the battery module, wherein: The battery module comprises: A stacked body formed by stacking a plurality of rechargeable batteries; and a side restraining member disposed opposite to the first surface of the stack and extending along the stacking direction of the stack, The first surface is a surface in a vertical direction relative to the lower surface of the stacked body and is a surface along the stacking direction. A first distance between an upper end of the side restraint member and the cover is shorter than a second distance between an upper surface of the stacked body and the cover.

2. The battery pack according to claim 1, characterized in that: The first distance is a distance in a state where the upper end of the side restraint member is in contact with the cover, or a distance in a state where the upper end is separated from the cover in the vertical direction.

3. The battery pack according to claim 1, characterized in that: The first surface and the side restraint member are engaged with each other by an engaging member.

4. The battery pack according to claim 1, characterized in that: A plurality of battery modules are arranged along a direction intersecting the first surface of the stacked body. The side restraint member is disposed in a state of being opposed to other side restraint members of other battery modules disposed adjacently in the housing in the intersecting direction.

5. The battery pack according to claim 4, characterized in that: The cover has a plurality of protrusions extending downward toward the battery module at positions separated along the intersecting direction. The side restraint member and the other side restraint members are located between the plurality of protrusions.

6. The battery pack according to claim 5, characterized in that: The lower ends of the plurality of protrusions are extended so as to be located closer to the battery module than upper ends of the side restraint member and the other side restraint members.

7. The battery pack according to claim 5 or 6, characterized in that: In a state of being located between the plurality of protrusions, the side restraint member and the other side restraint members are arranged at positions separated from the plurality of protrusions in the intersecting direction.

8. The battery pack according to claim 5 or 6, characterized in that: The side restraint member and the other side restraint member are arranged at positions abutting against the plurality of protrusions in the intersecting direction in a state of being located between the plurality of protrusions.

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