Battery module and battery pack

Abstract

The invention provides a battery module, which can inhibit the weight increase of the battery module and improve the carrying efficiency. The battery module includes: a laminated body in which a plurality of rechargeable batteries are laminated; and a side restraining member which faces a first surface of the laminated body and extends in the lamination direction of the laminated body, the first surface being a surface in the vertical direction with respect to the lower surface of the laminated body and being a surface in the lamination direction, and the first surface and the side restraining member being joined by a joining member.

Description

Technical Field

[0001] The present invention relates to a battery module and a battery pack. Background Art

[0002] In recent years, in order to ensure that more people have access to appropriate, reliable, sustainable and advanced energy, research and development related to rechargeable batteries that contribute to energy efficiency has been carried out.

[0003] Patent document 1 discloses a battery module composed of a stack of multiple battery cells (rechargeable batteries), a pair of connecting rods, and a pair of end plates. The pair of connecting rods is a member that constrains the stacking direction of the multiple 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 that are mainly used to hold and protect the stack of multiple battery cells.

[0004] The battery pack is formed by mounting a plurality of battery modules in a housing (casing) for protecting them from external forces. The housing of the battery pack is provided with structural members such as cross members and side frames for the purpose of ensuring strength and rigidity, resistance to external forces, and connection with the vehicle.

[0005] The cross beam is a structural member extending in the stacking direction of the plurality of battery cells in the housing, and is a structural member extending in the same direction as the connecting rod that constrains the plurality of battery cells in the stacking direction. In addition, the side frame is a structural member extending in the arrangement direction of the plurality of battery cells in the housing (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 casing 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 casing.

[0007] Prior art literature

[0008] Patent Document 1: International Publication No. 2019 / 167689 Summary of the invention

[0009] Problems to be solved by the invention

[0010] However, the structural members (cross beams, side frames) provided on the casing and the structural members (connecting rods, end plates) constituting the battery modules are provided independently, which may be inefficient in terms of cost, weight, and ensuring space for mounting the battery modules on the casing.

[0011] When 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 external force resistance, the weight of the battery modules increases. Therefore, it is required to suppress the weight increase.

[0012] In addition, structural components (connecting rods, end plates) that constitute the battery module and structural components (cross beams, side frames) of the outer shell (hereinafter also referred to as the shell) partially occupy the mounting space of the battery cells in the shell, so it is required to improve the mounting efficiency of the battery module including the rechargeable battery.

[0013] Means used to solve problems

[0014] In view of the above problems, the present application provides a battery module that can suppress an increase in the weight of the battery module and improve the mounting efficiency.

[0015] A battery module according to one embodiment of the present invention is a battery module, wherein:

[0016] The battery module comprises:

[0017] a stacked body in which a plurality of rechargeable batteries are stacked; and

[0018] a side restraining member disposed opposite to the first surface of the stacked body and extending along the stacking direction of the stacked body,

[0019] 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.

[0020] The first surface is engaged with the side restraining member by an engaging member.

[0021] A battery pack according to another aspect of the present invention is a battery pack in which a plurality of battery modules are arranged in a casing, wherein:

[0022] The plurality of battery modules respectively include:

[0023] a stacked body in which a plurality of rechargeable batteries are stacked; and

[0024] a side restraining member, which is opposite to the first surface of the stacked body and extends along the stacking direction of the stacked body,

[0025] 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.

[0026] The first surface is engaged with the side restraining member by an engaging member.

[0027] Effects of the Invention

[0028] According to the present invention, it is possible to provide a battery module capable of suppressing an increase in the weight of the battery module and improving the mounting efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A diagram schematically illustrating the configuration of a battery module and a battery module group according to an embodiment.

[0030] Figure 2 It is a diagram for explaining the joining structure between the battery cell and the side restraint member according to the embodiment.

[0031] Figure 3 This is a diagram for explaining a structure in which a battery module group according to an embodiment is arranged in a case.

[0032] Figure 4 This is a diagram showing a connection configuration example 1 of edge restraining members according to the embodiment.

[0033] Figure 5 This is a diagram showing a second connection configuration example of the edge restraining member according to the connection embodiment.

[0034] Figure 6 This is a diagram showing a connection configuration example 3 of the edge restraining member according to the embodiment.

[0035] Figure 7 This is a diagram illustrating a cross-sectional structure of a battery cell according to an embodiment.

[0036] Description of Reference Numerals

[0037] 100: battery cell (rechargeable battery);

[0038] 110: laminate;

[0039] 200: side restraint member;

[0040] 231: flange;

[0041] 232: flange;

[0042] 300: edge restraining member;

[0043] 310: edge restraining member of the strip;

[0044] 331: stairs;

[0045] 332: stairs;

[0046] 400: housing (battery housing);

[0047] 410: hood;

[0048] 450: frame;

[0049] 455: Enhancement Department;

[0050] 500: Battery pack. DETAILED DESCRIPTION

[0051] 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, not all of the feature combinations described in the embodiments are necessary for the invention. Two or more of the multiple features described in the embodiments can be combined arbitrarily. In addition, the same or identical configurations are marked with the same reference numerals, and repeated descriptions are omitted.

[0052] <Battery Module 110 and Battery Module Group 115>

[0053] Figure 1 The diagram schematically illustrates the configuration of a battery module 110 and a battery module group 115 according to the embodiment.

[0054] exist Figure 1 As shown in 1A, 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.

[0055] exist Figure 1 In the embodiment, the X direction (stacking direction) of the stack 111 is referred to as the first direction. In addition, the direction (Y direction) intersecting the plane (XZ plane: first surface 101) of the plurality of battery cells 100, that is, the plane (XZ plane: first surface 101) of the battery module 110 (stack 111) is referred to as the second direction (intersecting direction). The direction intersecting the first direction and the second direction is referred to as the third direction (vertical direction).

[0056] 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 regarded 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 regarded as the second surface 102.

[0057] 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.

[0058] 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.

[0059] like Figure 1 As shown in FIG. 1B , the side restraint members 200 ( 200 a , 200 b ) are opposed to 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 .

[0060] The first surface 101 (XZ plane) 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.

[0061] Figure 2 This 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 (second surface 102), and an insulating film 702 is provided between the bonding member 701 (for example, an adhesive material, a double-sided tape) and the battery cell 100. The insulating film 702 is provided to cover not only the interface between the insulating film 702 and the bonding member 701, but also a portion of the lower surface and the upper surface of the battery cell 100. The type of the insulating film 702 is not particularly limited, and it may also be a resin material. As a resin material, for example, polyethylene terephthalate (PET), polytetrafluoroethylene (PTFE), etc. may be included.

[0062] 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 a resin material may also be used. A flame retardant member may be used so that the insulating film 702 and the filler 703 can also cope with the situation of being exposed to high temperature due to thermal runaway of the battery cell 100.

[0063] When an adhesive material is used as the bonding member 701, an adhesive can be filled between the first surface 101 (XZ plane) and the side restraining member 200 for bonding. The type of the adhesive material is not particularly limited, and examples thereof include acrylic resin, polyurethane-based resin, silicone-based resin, epoxy resin, and olefin-based resin.

[0064] When the YZ plane (second surface 102) is viewed from the side, the side restraint member 200 joined to the left side of the paper plane of the battery cell 100 is expressed as the side restraint member 200 (200a). In addition, the side restraint member 200 joined to the right side of the paper plane of the battery cell 100 is expressed as the side restraint member 200 (200b). The expressions "side restraint member 200" or "side restraint members 200 (200a, 200b)" are collective names for the side restraint members 200 (200a) and the side restraint members 200 (200b).

[0065] In addition, the first surface 101 (XZ plane) on the left side of the paper of the battery cell 100 is expressed as the first surface 101 (101a), and the first surface 101 (XZ plane) on the left side of the paper of the battery cell 100 is expressed as the first surface 101 (101b). The expression "first surface 101" or "first surface 101 (XZ plane)" is a general term for the first surface 101 (101a) and the first surface 101 (101b).

[0066] The first surface 101 ( 101 a ) and the first surface 101 ( 101 b ) of the battery cell 100 have the same bonding structure.

[0067] exist Figure 2 Among the battery cells 100 shown, the battery cells 100 indicated by the dotted lines represent other battery cells 100 arranged adjacent to the battery cells 100 indicated by the solid lines in the Y direction. The side restraints 200 (200b) indicated by the dotted lines are joined to the battery cells 100 by the same joining structure as the side restraints 200 (200a).

[0068] exist Figure 2 In the embodiment, the side restraint member 200 (200a) faces the first surface 101 (101a) at one end in the Y direction, and the side restraint member 200 (200b) faces the first surface 101 (101b) at the other end in the Y direction.

[0069] 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 plane) of each battery cell 100 constituting the battery module 110 (stacked body 111).

[0070] like Figure 1 1B and Figure 2 As shown, when observing the YZ surface (second surface 102) from the side, a pair of side restraint members 200 (200a, 200b) are opposite to the first surface 101 (101a) on one end side of the Y direction of the YZ surface (second surface 102) of the stack 111 (battery cell 100) and the first surface 101 (101b) on the other end side of the Y direction, and are extended along the stacking direction of the stack 111 (battery cell 100).

[0071] 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 .

[0072] like Figure 1 As shown in FIG1C , in the case ( 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 with respect to the lower surface of the stacked body 111 and intersecting with the stacking direction.

[0073] The side restraint members 200 (200a, 200b) are adjacent to the side restraint members ( Figure 3 The side restraint members 200 of the other battery modules 110 (400) are opposite.

[0074] For example, a side restraint member 200 (eg, Figure 2 solid line), and side restraint members 200 (e.g. Figure 2 The dotted line) is arranged in the shell 400 in a state opposite to each other in the second direction.

[0075] like Figure 1As shown in FIG1D , the battery module 110 further includes an edge 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 .

[0076] exist Figure 1 In 1D, when the XZ plane (first surface 101) is viewed from the side, the edge restraining member 300 on the right side of the paper of the battery module 110 is expressed as the edge restraining member 300 (300a). In addition, the edge restraining member 300 on the left side of the paper of the battery module 110 is expressed as the edge restraining member 300 (300b). The expressions "edge restraining member 300" or "edge restraining member 300 (300a, 300b)" are collective names for the edge restraining member 300 (300a) and the edge restraining member 300 (300b).

[0077] In addition, the edge restraint member 300 of each battery module 110 is connected to the edge restraint member 300 of other battery modules 110 arranged adjacently along the second direction (Y direction) to form a long edge restraint member 310. The long edge restraint member 310 on the right side of the paper of the battery module 110 is expressed as a long edge restraint member 310 (310a). In addition, the long edge restraint member 310 on the left side of the paper of the battery module 110 is expressed as a long edge restraint member 310 (310b). The expression "long edge restraint member 310" or "long edge restraint member 310 (310a, 310b)" is a general term for the long edge restraint member 310 (310a) and the long edge restraint member 310 (310b).

[0078] In addition, when the XZ plane (first surface 101) is viewed from the side, the second surface 102 (YZ plane) on one end side in the X direction of the battery module 110 is expressed as the second surface 102 (102a), and the second surface 102 (YZ plane) on the other end side in the X direction is expressed as the second surface 102 (102b). Expressions such as "second surface 102 (YZ plane)" or "second surfaces 102 (102a, 102b)" are collectively referred to as the second surface 102 (102a) and the second surface 102 (102b).

[0079] The edge restraining member 300 is a plate-shaped member made of metal such as aluminum, aluminum alloy, copper, iron, iron alloy, stainless steel, etc. The shape of the edge restraining member 300 is not particularly limited, as long as it can hold and restrain the second surface 102 (YZ plane) of the battery module 110 (stacked body 111).

[0080] exist Figure 1In 1D, when the XZ plane direction is viewed from the side, a pair of edge restraining members 300 (300a, 300b) are arranged to extend and 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 edge restraining member 300 (300a) faces the second surface 102 (102a) on one end side in the X direction, and the edge restraining member 300 (300b) faces the second surface 102 (102b) on the other end side in the X direction.

[0081] The edge restraining member 300 can function as a member that holds and restrains the arrangement direction (Y direction: second direction) of the battery module 110 (stacked body 111 ), imparts strength and rigidity to the battery module 110 (stacked body 111 ), and protects the battery module 110 .

[0082] The edge restraining members 300 (300a, 300b) of each battery module 110 are connected and extended along the second direction (Y direction). The edge restraining members 300 (300a, 300b) connected along the second direction (Y direction) are configured as long edge restraining members 310 (310a, 310b). The long edge restraining members 310 (310a, 310b) can maintain and restrain the configuration direction (Y direction: second direction) of the collection (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 that protects the battery module group 115. Refer to Figures 4 to 6 The connection structure for connecting the edge restraining member 300 is described. In addition, in the following description, an example of connecting a plurality of edge restraining members 310a, 310b to form a long edge restraining member 310 (310a, 310b) is described, but it is not limited to this example, and a plurality of battery modules 110 can be held and restrained by a single edge restraining member 310. In this case, a plurality of battery modules 110 can be held and restrained by a single edge restraining member 310 having the same length as the long edge restraining member 310 obtained by the connection structure. That is, the edge restraining member 310 is configured as a single long edge restraining member along the direction of the second surface 102 (YZ plane) of the battery module 110, and the single long edge restraining member 310 can be configured to hold a plurality of battery modules 110 arranged in the direction of the second surface 102. The edge restraining member 310 is a rigid body, and thus the plurality of battery modules 110 can be held by this structure, and the side frames of the casing and the end plates constituting the battery modules can be integrated by restraining them, thereby suppressing an increase in the weight of the battery modules and improving the mounting efficiency.

[0083] Figure 11E shows an assembly (battery module group 115 ) of battery modules 110 in which a plurality of battery modules 110 are arranged in an arrangement direction (Y direction: second direction).

[0084] 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. Electrical components 116 are installed in each battery module 110 constituting the battery module group 115. The electrical components 116 include, for example, conductive components (bus bars) that electrically connect the terminals between the battery cells 100 constituting the stack 111, voltage detection lines that detect the voltage from each battery cell 100, and the like.

[0085] In the battery module group 115, the side restraint members 200 (200a, 200b) of each battery module 110 can hold and restrain the battery module 110 (stacked body 111) in the stacking direction (X direction: first direction), and provide strength and rigidity to the battery module 110 (stacked body 111), thereby functioning 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 beam of the outer shell (casing) in the prior art with the connecting rod constituting the battery module.

[0086] In the conventional art, the functions of the beams of the outer casing (housing) and the functions of 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.

[0087] In addition, the long edge restraining member 310 (310a, 310b) is capable of maintaining the configuration direction (Y direction: second direction) of the assembly of multiple battery modules 110 (battery module group 115), restraining the battery module group 115 and giving the battery module group 115 strength and rigidity, thereby functioning as a member for protecting the battery module group 115.

[0088] The long edge restraining members 310 (310a, 310b) have a function of integrating the side frame of the casing (housing) in the related art with the end plates constituting the battery module.

[0089] In the prior art, the functions of the side frames of the outer shell (shell) and the functions of the end plates can be integrated into the edge restraining members 300 (300a, 300b) and the long edge 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.

[0090] <Battery Pack 500>

[0091] The battery pack 500 is mounted (arranged) in a housing 400 for protecting the plurality of battery modules 110 (battery module group 115) from external forces and is covered from above by a cover 410. The battery pack 500 can be mounted on, for example, a hybrid vehicle or an electric vehicle such as an EV (not shown).

[0092] Figure 3 This is a diagram for explaining the structure of arranging the battery module group 115 in the housing 400 (battery housing). The housing 400 is a tray-shaped housing, and the bottom plate of the housing 400 can be composed 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.

[0093] exist Figure 1 The edge restraining member 300 (300a, 300b) described in the figure has a hole (through hole) through which the 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 threaded member) that is screwed with the fastening member 460 (for example, a fastening bolt) is formed in the housing 400. The housing 400 has an interface 430 installed therein, which includes a control unit 420 for controlling the power supplied from the battery module group 115, and a connector for connecting to an external device.

[0094] A frame 450 for reinforcing the housing 400 is installed on the lower surface of the housing 400. The frame 450 is provided along one side of the housing 400 (for example, at Figure 2 The frame 450 helps to improve the strength and rigidity of the housing 400. Since the battery pack 500 is lightweight, the frame 450 can be set to be above (for example, at Figure 2 The reinforcing portion 455 is formed in a substantially hollow structure such as a rib in the Z direction. The number of reinforcing portions 455 is not particularly limited, and at least one reinforcing portion 455 may be formed. Figure 2 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 can also be set along the X direction.

[0095] 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).

[0096] The cover 410 is a member that covers the upper side 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.

[0097] In the configuration of the battery module group 115, the functions of the structural members are integrated into the side restraint members 200 and the edge restraint members 300, thereby making it 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 group 500 that can improve the efficiency of mounting the battery modules 110 in the housing 400.

[0098] <Joint structure example 1>

[0099] The edge restraint member 300 of each battery module 110 is connected to the edge restraint member 300 of another battery module 110 arranged adjacent to each other in the second direction (Y direction), thereby forming a long edge restraint member 310 .

[0100] Figure 4 This is a diagram showing a connection structure example 1 of the edge 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 4 In the example of FIG. 1 , an edge restraining member 300 (300a) is connected to another edge restraining member 300 (300a) for explanation. The edge restraining member 300 (300a) is connected to another edge restraining member 300 (300a) by engaging a connecting pin 610 that abuts against both the edge restraining member 300 (300a) and the other edge restraining member 300 (300a).

[0101] A YZ surface of one edge restraining member 300 (300a) is formed with a recess 611 and a recess 612 that fit with a connecting pin 610. The connecting pin 610 fits into the recess 611 (first fitting portion) in one edge restraining member 300 (300a) and the recess 612 (second fitting portion) in the other edge restraining member 300, thereby connecting one edge restraining member 300 (300a) to the other edge restraining member 300 (300a).

[0102] Each fitting portion may be formed into a different shape so that when the connecting pin 610 is fitted into the recess 611 (first fitting portion) and the recess 612 (second fitting portion), the fitting state in the recess 611 (first fitting portion) is different from the fitting state in the recess 612 (second fitting portion). For example, as a different shape, the opening size of the recess may be changed to make the dimensional tolerance different.

[0103] Each fitting portion is formed to have a rough surface so that when the connecting pin 610 is fitted into the recess 611 (first fitting portion) and the recess 612 (second fitting portion), the fitting state in the recess 611 (first fitting portion) is different from the fitting state in the recess 612 (second fitting portion).

[0104] For example, the recessed portion 611 may be formed to achieve a tight fitting state (first fitting state), or the recessed portion 612 may be formed to achieve a loose fitting state (second fitting state) that is relaxed compared to the first fitting state.

[0105] exist Figure 4 In the example, at least different types of recesses 611 and 612 are formed on the YZ surface of one edge restraining member 300 (300a). That is, the recess 611 for the first mating state and the recess 612 for the second mating state can be formed on the YZ surface of one edge restraining member 300 (300a).

[0106] The side restraint 200 (200a) in one battery module 110 is connected to (contacts) one edge restraint 300 (300a). In addition, the side restraint 200 (200b) in another adjacent battery module 110 is connected to (contacts) another edge restraint 300 (300a).

[0107] When the edge restraint members 300 ( 300 a ) are connected to each other, the adjacent side restraint members 200 ( 200 a ) and the side restraint members 200 ( 200 b ) are held in a sandwiched state by one edge restraint member 300 ( 300 a ) and the other edge restraint member 300 ( 300 a ).

[0108] The edge restraint member 300 ( 300 a ) has a hole (through hole) through which the fastening member 460 can pass. The edge restraint member 300 ( 300 a ) is connected to the case 400 in which the battery module 110 is arranged via the fastening member 460 .

[0109] 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 edge restraints 300 ( 300 a , 300 b ).

[0110] Furthermore, even in the edge restraint member 300 ( 300 b ) on the other end side of the battery module 110 , the edge restraint members 300 ( 300 b ) adjacent to each other can be connected by the same connection configuration example 1.

[0111] In the connection structure using the connection pin 610, one side is in a tightly fitted state (first fitted state) and the other side is in a loosely fitted state (second fitted state), thereby improving the assembly performance when connecting the edge restraint member 300. That is, even before the edge restraint members 300 are connected to each other, the alignment of the side restraint members 200 in each battery module 110 becomes easy, and the positional relationship between the side restraint member 200 and the edge restraint member 300 can be easily adjusted.

[0112] <Joint structure example 2>

[0113] Figure 5 This is a diagram showing a second example of a connection structure of the edge restraining member 300 (300a) according to the embodiment. In the second example of a connection structure, a connection structure using a reinforcing member 620 is described. Figure 5 In the example, similar to the connection configuration example 1, the description will be given of one edge restraint member 300 (300a) being connected to another edge restraint member 300 (300a).

[0114] In connection configuration example 2, the side restraint member 200 (200a) in one battery module 110 is connected (contacted) with one edge restraint member 300 (300a) as in connection configuration example 1. In addition, the side restraint member 200 (200b) in another adjacent battery module 110 is connected (contacted) with another edge restraint member 300 (300a).

[0115] When the edge restraint members 300 ( 300 a ) are connected to each other, the adjacent side restraint members 200 ( 200 a ) and the side restraint members 200 ( 200 b ) are held in a state of being sandwiched between one edge restraint member 300 ( 300 a ) and the other edge restraint member 300 ( 300 a ).

[0116] like Figure 5 As shown, the reinforcing member 620 is a long reinforcing member extending in the Y direction, and the length of the reinforcing member 620 is arbitrary according to the number of the edge restraining members 300 connected. Figure 5 In the illustrated example, a long reinforcing member 620 is provided on the upper surface (XY plane) of one edge restraint member 300 ( 300 a ) and the other edge restraint member 300 ( 300 a ).

[0117] The long reinforcing member 620, the edge restraining member 300 (300a), and the other edge restraining member 300 (300a) are provided with a hole (through hole) through which the fastening member 460 can pass. The long reinforcing member 620, the edge restraining member 300, and the other edge 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 edge restraining member 300 (300a) and the other edge restraining member 300 (300a).

[0118] Furthermore, even in the edge restraint member 300 ( 300 b ) on the other end side of the battery module 110 , the edge restraint members 300 ( 300 b ) adjacent to each other can be connected by the same connection configuration example 2.

[0119] In the connection configuration example 2 as well, the battery module 110 held on the XZ plane by the side restraints 200 (200a, 200b) is held (connected) to the case 400 via the side restraints 200 (200a, 200b) and the edge restraints 300 (300a, 300b).

[0120] <Joint structure example 3>

[0121] Figure 6 This is a diagram showing a third example of a connection structure of the edge restraining member 300 according to the embodiment. In the third example of a connection structure, a connection structure using a reinforcement member 630 is described. Figure 6 In the example, as in the connection structure example 1, one edge restraint member 300 (300a) and another edge restraint member 300 (300a) are described.

[0122] In connection configuration example 3, one side restraint member 200 (200a) in one battery module 110 is connected (contacted) with one edge restraint member 300 (300a). In addition, other side restraint members 200 (200b) in other adjacent battery modules 110 are connected (contacted) with other edge restraint members 300 (300a).

[0123] 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 edge restraint member 300 (300a).

[0124] In addition, in the other side restraint member 200 (200a), a flange 231 (second flange) is formed at the end of the side restraint member 200 along the Y direction (Y-direction), and in the other edge restraint member 300 (300a), a step 331 (second step) that can be connected (abutted) with the flange 231 is formed.

[0125] The steps 331 and 332 are provided with screw-engaging portions 631 (eg, external threads) that are screw-engaged with a fastening member 632 (eg, a fastening nut).

[0126] like Figure 6 As shown, the reinforcing member 630 is a reinforcing member for reinforcing the YZ surface of the edge restraining member 300 (300a).

[0127] 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 to the steps 331 and 332 by the fastening member 632, thereby connecting one edge restraining member 300 (300a) to the other edge restraining member 300 (300a).

[0128] Furthermore, even in the edge restraint members 300 ( 300 b ) on the other end side of the battery module 110 , the edge restraint members 300 ( 300 b ) adjacent to each other can be connected by the same connection configuration example 3.

[0129] In the connection configuration example 3 as well, the battery module 110 held on the XZ plane by the side restraints 200 ( 200 a , 200 b ) is held by the case 400 via the side restraints 200 ( 200 a , 200 b ) and the edge restraints 300 ( 300 a , 300 b ).

[0130] In order to integrate the functions of the structural member (side frame) provided on the housing described in the prior art with the structural member (end plate) constituting the battery module, the elongated end plate needs to be a rigid body. On the other hand, it is difficult to make fine adjustments to the assembly position of the elongated end plate when assembling it to the housing, which can reduce the assembly efficiency.

[0131] In the above-mentioned connection structure example 2 and connection structure example 3, the edge restraining member 300 is connected using a reinforcement, thereby forming a similar long end plate. By connecting a plurality of edge restraining members 300 similar long end plates using a reinforcement, the rigidity of the connection portion can be improved. In addition, the assembly position can be finely adjusted in each edge restraining member 300, which can improve the assembly performance. Furthermore, it is possible to suppress the increase in weight and improve the mounting efficiency of the battery module.

[0132] <Battery Cell>

[0133] Figure 7 This is a diagram showing a cross-sectional structure (XZ cross section) of a battery cell 100. The battery cell 100 (rechargeable battery) can be an all-solid-state battery.

[0134] In the coordinate system in the figure, the X axis represents the length direction of the battery cell 100 (the direction in which the lead tabs extend), and the Z axis represents the thickness direction of the battery cell 100 (the thickness direction of the electrode body 2 ).

[0135] The battery cell 100 includes an electrode body 2 (also referred to as a laminate in this embodiment) which is a storage element having a positive electrode layer, a solid electrolyte layer and a negative electrode layer stacked together, an outer casing 18 that seals the periphery of the electrode body 2 housed therein, lead tabs 13 and 14 , and collector tabs 15 and 16 .

[0136] The electrode body 2 has a two-layer structure of a positive electrode layer and a negative electrode layer. The positive electrode layer has two layers of a positive electrode layer 21 and a positive electrode layer 23, and the negative electrode layer has two layers of a negative electrode layer 22 and a negative electrode layer 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 multiple 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 in which the positive electrode layer and the negative electrode layer are two layers is illustrated, but the present invention is not limited thereto, and the positive electrode layer and the negative electrode layer may be three or more layers.

[0137] The positive electrode layer 21 and the positive electrode layer 23 each have a positive electrode active material layer 711 and a positive electrode collector 712. The positive electrode collector 712 is shared by the two positive electrode layers 21 and the positive electrode layer 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.

[0138] 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 layer 22 and the negative electrode layer 24 are stacked to sandwich the positive electrode layer 21 and the positive electrode layer 23. The negative electrode layer 22 and the negative electrode layer 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 configuration of the positive electrode layer and the negative electrode layer is not limited to Figure 7 The stacking order shown may be a structure in which two positive electrode layers are stacked with two negative electrode layers sandwiched therebetween.

[0139] 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.

[0140] 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, other materials that can be mentioned include carbon materials such as graphite, soft carbon and hard carbon, tin-based materials, transition metal oxides (such as lithium titanate: LTO), etc.

[0141] The solid electrolyte layer 25 is composed of, for example, a solid electrolyte having ion conductivity, and examples of such a material include sulfide-based solid electrolyte materials, oxide-based solid electrolyte materials, nitride-based solid electrolyte materials, and halogenide-based solid electrolyte materials.

[0142] 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 be combined by an organic polymer compound-based binder to form particles constituting these substances. The positive electrode active material layer 711 or the negative electrode active material layer 721 may include electronic conductive additives 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 can also be obtained due to the construction of the ion conductive path.

[0143] The outer casing 18 is a container that contains the electrode body 2. The outer casing 18 is formed by folding a single sheet into two or by attaching multiple sheets together. The outer casing 18 is formed by, for example, insulating layers covering the front and back surfaces of a metal layer.

[0144] 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 collector 712 via the 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 collector tab 15 are formed of, for example, a conductive metal sheet or metal plate.

[0145] 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 collector 722 via the 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 collector tab 16 are formed of, for example, a conductive metal sheet or metal plate. The lead tab 13 and the lead tab 14 are connected to a charger or an electric load, thereby enabling the electrode body 2 to be charged or discharged.

[0146] <Summary of implementation methods>

[0147] The above-mentioned embodiments disclose at least the following battery modules and battery packs.

[0148] (Item 1) The battery module (110) of the above embodiment includes: a stacked body (111) in which a plurality of rechargeable batteries (100) are stacked; and

[0149] a side restraining member (200) which is opposite to the first surface of the stacked body and extends along the stacking direction (X direction) of the stacked body,

[0150] The first surface (101) is a surface in a vertical direction relative to the lower surface (XY plane) of the stacked body and is a surface along the stacking direction (X direction).

[0151] The first surface (101) and the side restraint member (200) are engaged with each other through an engaging member (701).

[0152] According to the battery module of item 1, a battery module capable of suppressing an increase in the weight of the battery module and improving the mounting efficiency can be provided. A battery module in which a cross member of a case and a connecting rod constituting the battery module are integrated can be provided.

[0153] (Item 2) In a housing (400) in which the battery module (110) is arranged, a plurality of the battery modules (110) are arranged in a direction intersecting the first surface of the stacked body,

[0154] The side restraint member (200 (200a)) is arranged in a state of being opposed to the side restraint member (200 (200b)) of another battery module arranged adjacently in the housing in the intersecting direction.

[0155] According to the battery module of item 2, in the prior art, the functions of the cross beam of the outer shell (shell) and the functions of the connecting rod 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.

[0156] (Item 3) A single elongated edge restraint member formed in the direction along the second surface of the stacked body in the direction intersecting the first surface of the stacked body holds the plurality of battery modules arranged in the direction of the second surface.

[0157] (Item 4) The battery module further includes an edge restraining member (300) that holds the second surface of the stacked body in a direction intersecting the first surface of the stacked body and is connected to the side restraining member.

[0158] The edge restraining member (300) is connected to the housing in which the battery module is arranged.

[0159] (Item 5) The edge restraining member (300) is configured to be connectable with other edge restraining members (300) in a direction along the second surface.

[0160] A plurality of edge restraint members including the edge restraint member (300) and the other edge restraint members (300) hold a plurality of battery modules (110) arranged in the direction of the second surface.

[0161] According to the battery modules of item 3, item 4 and item 5, a battery module can be provided which can suppress an increase in the weight of the battery module and improve the mounting efficiency. A battery module can be provided in which the side frame of the case and the end plate constituting the battery module are integrated.

[0162] (Item 6) The battery module (110) is held by the housing (400) via the side restraint members (200) and the edge restraint members (300).

[0163] According to the battery module of item 6, the battery module can be held by the casing without using the horizontal beam of the casing (casing) or the side frame of the casing (casing) in the conventional art.

[0164] (Item 7) The edge restraint member (300) is connected to other edge restraint members (300) of other battery modules arranged adjacent to each other in the intersecting direction within the housing.

[0165] (Item 8) The edge restraint member (300) is connected to the other edge restraint member by fitting a connection pin (610) that abuts against both the edge restraint member and the other edge restraint member.

[0166] (Item 9) The edge restraining member (300) is provided with a first fitting portion (611) that fits with the connecting pin, and the other edge restraining member is provided with a second fitting portion (612) that fits with the connecting pin,

[0167] The connecting pin (610) connects the edge restraining member (300) with the other edge restraining member (300) by being engaged with the first engaging portion (611) and the second engaging portion (612).

[0168] (Item 10) The first fitting portion (611) and the second fitting portion (612) are respectively formed into different shapes so that when the connecting pin (610) is fitted with the first fitting portion (611) and the second fitting portion (612), the fitting state in the first fitting portion (611) is different from the fitting state in the second fitting portion (612).

[0169] (Item 11) The first fitting portion (611) and the second fitting portion (612) are respectively formed with different surface roughnesses so that when the connecting pin (610) is fitted with the first fitting portion (611) and the second fitting portion (612), the fitting state in the first fitting portion (611) is different from the fitting state in the second fitting portion (612).

[0170] (Item 12) The reinforcement members (620, 630) that abut against both the edge restraint member and the other edge restraint member are fastened together by fastening members (460, 632), thereby connecting the edge restraint member (300) and the other edge restraint member (300).

[0171] (Item 13) The fastening member (460) is a fastening member that connects the edge restraining member (300) to the housing (400).

[0172] (Item 14) A reinforcement member (630) abutting against a first flange (232) formed on the end of the side restraint member (200) and a second flange (231) formed on the end of the side restraint member in the other battery module is fastened together by a fastening member (632), thereby connecting the edge restraint member (300) and the other edge restraint member (300).

[0173] (Item 15) The edge restraining member (300) is formed with a first step (332) capable of abutting against the first flange (232), and the other edge restraining member is formed with a second step (331) capable of abutting against the second flange (231),

[0174] The fastening member (632) is a fastening member that is screwed into a screw-engaging portion (631) formed on the first step (332) and the second step (331).

[0175] According to the battery modules of items 7 to 15, the connected long edge restraint members 310 have a function of integrating the side frames of the casing (housing) in the related art and the end plates constituting the battery module.

[0176] In the prior art, the functions of the side frame of the housing (casing) and the functions of the end plate can be integrated into the edge restraint member and the connected long edge restraint member. As a result, the battery module and the battery module group composed of multiple battery modules have sufficient strength and rigidity.

[0177] (Item 16) The battery pack of the above embodiment is a battery pack (500) in which a plurality of battery modules are arranged in a housing,

[0178] The plurality of battery modules (110) respectively include:

[0179] a stacked body (111) in which a plurality of rechargeable batteries are stacked; and

[0180] a side restraining member (200) which is opposite to the first surface of the stacked body and extends along the stacking direction (X direction) of the stacked body,

[0181] The first surface (101) is a surface in a vertical direction relative to the lower surface (XY plane) of the stacked body and is a surface along the stacking direction (X direction).

[0182] The first surface is engaged with the side restraining member by an engaging member.

[0183] According to the battery pack of item 16, it is possible to provide a battery pack having a battery module capable of suppressing an increase in the weight of the battery module and achieving improved mounting efficiency.

[0184] The present invention is not limited to the above-described embodiment, and various modifications and changes can be made within the scope of the gist of the present invention.

Claims

1. A battery module, characterized in that: The battery module comprises: a stacked body in which a plurality of rechargeable batteries are stacked; and a side restraining member, which is opposite to the first surface of the stacked body and extends along the stacking direction of the stacked body, 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. The first surface is engaged with the side restraining member by an engaging member.

2. The battery module according to claim 1, characterized in that: In a housing in which the battery module is arranged, The battery modules are arranged in a plurality in a direction intersecting the first surface of the stacked body. The side restraint member is disposed in a state of being opposed to a side restraint member of another battery module disposed adjacently in the housing in the intersecting direction.

3. The battery module according to claim 2, characterized in that: A single elongated edge restraint member formed in the direction along the second surface of the stacked body in a direction intersecting the first surface of the stacked body holds a plurality of battery modules arranged in the direction of the second surface.

4. The battery module according to claim 2, characterized in that: The battery module further includes an edge restraining member that holds a second surface of the stacked body in a direction intersecting the first surface of the stacked body and is connected to the side restraining member. The edge restraining member is coupled to the housing in which the battery module is disposed.

5. The battery module according to claim 4, characterized in that: The edge restraining member is configured to be connectable with other edge restraining members in a direction along the second surface. A plurality of edge restraint members including the edge restraint member and the other edge restraint members hold a plurality of battery modules arranged in the direction of the second surface.

6. The battery module according to claim 4, characterized in that: The battery module is held by the case via the side restraint members and the edge restraint members.

7. The battery module according to claim 4, characterized in that: The edge restraint member is connected to other edge restraint members of other battery modules arranged adjacently in the intersecting direction within the housing.

8. The battery module according to claim 7, characterized in that: The edge restricting member is connected to the other edge restricting member by fitting a connecting pin that abuts against both the edge restricting member and the other edge restricting member.

9. The battery module according to claim 8, characterized in that: The edge restraining member is formed with a first fitting portion that fits with the connecting pin, and the other edge restraining member is formed with a second fitting portion that fits with the connecting pin. The connecting pin connects the edge restraining member and the other edge restraining member by fitting with the first fitting portion and the second fitting portion.

10. The battery module according to claim 9, characterized in that: The first fitting portion and the second fitting portion are formed in different shapes, respectively, so that when the connecting pin is fitted with the first fitting portion and the second fitting portion, the fitting state in the first fitting portion is different from the fitting state in the second fitting portion.

11. The battery module according to claim 9, characterized in that: The first fitting portion and the second fitting portion are formed to have different surface roughnesses, respectively, so that when the connecting pin is fitted with the first fitting portion and the second fitting portion, the fitting state in the first fitting portion is different from the fitting state in the second fitting portion.

12. The battery module according to claim 7, characterized in that: The edge restraint member and the other edge restraint member are connected to each other by being fastened together by a fastening member.

13. The battery module according to claim 12, characterized in that: The fastening member is a fastening member that connects the edge restraining member to the housing.

14. The battery module according to claim 7, characterized in that: The reinforcement member that abuts against both the first flange formed on the end of the side restraint member and the second flange formed on the end of the side restraint member in the other battery module is fastened together by a fastening member, thereby connecting the edge restraint member and the other edge restraint member.

15. The battery module according to claim 14, characterized in that: The edge restraining member is formed with a first step capable of abutting against the first flange, and the other edge restraining member is formed with a second step capable of abutting against the second flange. The fastening member is a fastening member that is screwed into screw-engaging portions formed on the first step and the second step.

16. A battery pack, wherein a plurality of battery modules are arranged in a housing, characterized in that: The plurality of battery modules respectively include: a stacked body in which a plurality of rechargeable batteries are stacked; and a side restraining member, which is opposite to the first surface of the stacked body and extends along the stacking direction of the stacked body, 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. The first surface is engaged with the side restraining member by an engaging member.

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