Battery module and electric equipment

Abstract

The invention discloses a battery module and electric equipment. The battery module comprises a plurality of battery cell units arranged along a first direction and an acquisition assembly, each battery cell unit comprises a battery cell and a bracket; each battery cell comprises an electrode assembly, a battery cell shell and an electrode terminal; the electrode terminal is connected to the electrode assembly and led out from the cell case. The battery cell shell comprises a main body part and a first sealing part; the electrode assembly is arranged on the main body part. The first sealing part comprises a first connecting part; the electrode terminal extends out of the battery cell shell from the first connecting part; the bracket includes a first portion. The first part covers a part of the first connecting part, and the electrode terminal extends out of the first part. The collecting assembly comprises a plurality of sampling pieces. The at least two electrode terminals and the sampling piece are connected in a stacked mode. According to the application, the at least two electrode terminals and the sampling piece are connected in the laminated manner, so that the risk of deformation of the electrode terminals and the sampling piece at the laminated part is reduced, and the sampling piece can be better connected with the electrode terminals.

Description

Battery modules and electrical equipment Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a battery module and electrical equipment. Background Art

[0002] Battery modules are currently widely used in drones, electric vehicles, smart energy storage devices, and other fields. Battery modules collect information through circuit boards, which complicates assembly processes, increases costs, and hinders production. In conditions such as cell expansion, vibration, and dropping, the electrode terminals may deform, affecting the battery module's usability.

[0003] Summary of the Invention

[0004] In view of this, it is necessary to provide a battery module and electrical equipment that can reduce process steps, save materials, and reduce the risk of electrode terminal deformation.

[0005] An embodiment of the present application provides a battery module comprising a plurality of battery cell units arranged along a first direction and a collection assembly. Each battery cell unit comprises a battery cell and a bracket, and the battery cell comprises an electrode assembly, a battery cell shell and an electrode terminal. The electrode terminal is connected to the electrode assembly and is led out from the battery cell shell. The battery cell shell comprises a main body and a first sealing portion. The electrode assembly is arranged in the main body. The first sealing portion comprises a first connecting portion, and the electrode terminal extends out of the battery cell shell from the first connecting portion. The bracket comprises a first part. The first part covers a portion of the first connecting portion, and the electrode terminal extends from the first part. The collection assembly comprises a plurality of sampling pieces. At least two electrode terminals and one sampling piece are stacked and connected.

[0006] The present application performs sampling by connecting the sampling piece to the electrode terminal, which can reduce process steps and save materials. By covering the first connecting part with the first part, the toughness of the first connecting part is improved, which is conducive to better connection of the sampling piece to the electrode terminal. By stacking at least two electrode terminals and a sampling piece, the risk of deformation of the electrode terminals and the sampling piece in the stacked part is reduced, which is conducive to better connection of the sampling piece to the electrode terminal.

[0007] Optionally, in some embodiments of the present application, the collection component includes a wire that connects each sampling component to facilitate the sampling component to collect electrical signal information of the battery cell.

[0008] Optionally, in some embodiments of the present application, the sampling piece is welded to or crimped to at least any one of the interconnected electrode terminals.

[0009] Optionally, in some embodiments of the present application, the electrode terminals of two adjacent battery cells extend out of the first portion and are partially stacked and connected to form a stacking area. The main body and the first portion are arranged along the second direction. Along the second direction, the projection of the sampling piece is located within the projection of the stacking area. The second direction is perpendicular to the first direction. Along the second direction, the thickness of the sampling piece and the stacking area increases. When the electrode terminal is deformed, the force of the deformation can be alleviated, and the portion of the stacking area that is not connected to the sampling piece will deform before the sampling piece, thereby protecting the sampling piece and reducing the risk of deformation of the sampling piece and\or falling off from the stacking area.

[0010] Optionally, in some embodiments of the present application, along the second direction, the sampling member is closer to the battery cell casing than the stacking area.

[0011] Optionally, in some embodiments of the present application, the portion of the electrode terminal extending out of the first part includes a first segment and a second segment. The first segments of the electrode terminals of adjacent battery cells are spaced apart along the first direction. The second segments of the electrode terminals of adjacent battery cells are stacked along the second direction. Along the second direction, the first segment extends out of the first part by a length H, 2mm≤H≤20mm. When two adjacent battery cells are relatively displaced, it is convenient for the electrode terminal to deform in the first direction, the second direction, and the third direction, which is beneficial to reduce the pulling on the stacking area and the sampling piece, and reduce the risk of deformation of the stacking area and the sampling piece.

[0012] Optionally, in some embodiments of the present application, H satisfies 3mm≤H≤15mm, which further facilitates deformation of the electrode terminal in the first direction, the second direction, and the third direction, and further helps to reduce the pulling on the electrode terminal.

[0013] Optionally, in some embodiments of the present application, the first sealing portion includes a first bend and a second bend. The first bend is connected to the second bend via a first connecting portion. The bracket includes a first side portion covering the first bend and a second side portion covering the second bend. The first side portion and the second side portion are arranged along a third direction. The first, second, and third directions are perpendicular to each other, protecting the first sealing portion.

[0014] Optionally, in some embodiments of the present application, when observed along the first direction, in the second direction, part of the first connecting part is located between the main body and the first part, and in the third direction, part of the first connecting part is located between the first side part and the second side part, which can provide expansion space for the first sealing part, facilitate pressure relief, reduce the impact of the pressure in the battery cell on the first connecting part, reduce the impact on the sealing of the first sealing part, and facilitate heat dissipation of the first sealing part.

[0015] Optionally, in some embodiments of the present application, there is pressure between adjacent battery cell shells to improve the performance of the battery cells.

[0016] Optionally, in some embodiments of the present application, the main bodies of adjacent battery cells are in contact and connected, and the adjacent battery cells apply pressure to each other through the main bodies, which can reduce the force on the first sealing part, improve the protection of the first sealing part, and reduce the buffer parts between adjacent battery cells that provide expansion space for the battery cells, thereby reducing the occupied space and improving the energy density of the battery module.

[0017] Optionally, in some embodiments of the present application, the battery cell housing includes a first wall, a second wall, a third wall, and a fourth wall. The second wall is disposed opposite the first wall along the second direction. The third wall is disposed opposite the fourth wall along the first direction. When viewed from a direction opposite to the second direction, in the first direction, the first portion does not extend beyond the third wall, and the first portion does not extend beyond the fourth wall. When the main bodies of adjacent battery cells apply pressure to each other, the force on the first sealing portion can be reduced, thereby improving protection of the first sealing portion.

[0018] Optionally, in some embodiments of the present application, the electrode assembly has a wound structure, including a first straight segment, a second straight segment, a first curved segment, and a second curved segment. The first straight segment connects the first curved segment and the second curved segment. The second straight segment connects the first curved segment and the second curved segment. Along the first direction, the projection of the third wall overlaps the projection of the first straight segment, and the projection of the fourth wall overlaps the projection of the second straight segment, facilitating pressure relief.

[0019] Optionally, in some embodiments of the present application, the bracket is integrally formed with the battery cell, which can improve the connection strength between the bracket and the battery cell.

[0020] Optionally, in some embodiments of the present application, the bracket is an insulating bracket, which can reduce the risk of short circuit between the bracket and the battery cell.

[0021] Optionally, in some embodiments of the present application, the first portion is disposed around at least a portion of the electrode terminal to enhance protection of the electrode terminal, which is beneficial to increasing the strength of the electrode terminal.

[0022] Optionally, in some embodiments of the present application, the sampling piece is configured to displace as the electrode terminal deforms, and part of the wire is configured to move with the sampling piece, thereby reducing the risk of the sampling piece being pulled by the wire, resulting in the sampling piece being detached from the electrode terminal or the sampling piece being disconnected from the wire.

[0023] Optionally, in some embodiments of the present application, when viewed in a direction opposite to the second direction, in the first direction, the first side portion is located between the third wall and the fourth wall. When the main bodies of adjacent battery cells apply pressure to each other, the force on the first sealing portion can be reduced, thereby improving the protection of the first sealing portion.

[0024] Optionally, in some embodiments of the present application, when viewed in a direction opposite to the second direction, in the first direction, the second side portion is located between the third wall and the fourth wall. When the main bodies of adjacent battery cells apply pressure to each other, the force on the first sealing portion can be reduced, thereby improving the protection of the first sealing portion.

[0025] Optionally, in some embodiments of the present application, along the second direction, the projection of the first side portion and the projection of the first curved section overlap, the projection of the first side portion and the projection of the first straight section are separated, and the projection of the first side portion and the projection of the second straight section are separated, which is conducive to pressure relief.

[0026] Optionally, in some embodiments of the present application, along the second direction, the projection of the second side portion and the projection of the second curved section overlap, the projection of the second side portion and the projection of the first straight section are separated, and the projection of the second side portion and the projection of the second straight section are separated, which is conducive to pressure relief.

[0027] Optionally, in some embodiments of the present application, the bracket includes a first extension portion, which extends from the first side portion. The first extension portion can protect the fifth wall and the second sealing portion, thereby increasing the connection strength between the bracket and the battery cell.

[0028] Optionally, in some embodiments of the present application, the bracket includes a second extension portion extending from the second side portion. The second extension portion can protect the sixth wall and the other second sealing portion, increase the connection strength between the bracket and the battery cell, and facilitate the integral molding of the bracket with the battery cell.

[0029] Optionally, in some embodiments of the present application, when viewed from a direction opposite to the second direction, in the first direction, the first side portion does not extend beyond the first extension portion, and a first gap is formed between adjacent first side portions. When adjacent main portions are in contact and connected and apply pressure to each other, the force acting on the first side portion is reduced, thereby reducing the force acting on the first sealing portion, thereby facilitating protection of the first sealing portion. The first gap also facilitates heat dissipation from the battery cell.

[0030] Optionally, in some embodiments of the present application, when viewed in a direction opposite to the second direction, the second side portions do not extend beyond the second extension portion in the first direction, and a second gap is formed between adjacent second side portions. When adjacent main body portions are in contact and connected and apply pressure to each other, the second gap can reduce the force acting on the second side portions, thereby further reducing the force acting on the first sealing portion, further facilitating protection of the first sealing portion. The second gap also facilitates heat dissipation from the battery cell.

[0031] Optionally, in some embodiments of the present application, the battery module further comprises an elastic member, comprising a base, a third bend, and a fourth bend, wherein the third bend is connected to the fourth bend via the base. The base is configured to apply pressure to the battery cell, and the third and fourth bends are configured to provide expansion space for the battery cell, thereby buffering the pressure exerted on the battery cell and reducing the impact on the service life of the battery module. Continuous application of pressure to the battery cell by the base keeps the battery cell in a pressurized state and maintains dynamic balance, which helps to increase the service life of the battery module.

[0032] Optionally, in some embodiments of the present application, the elastic member includes a first connecting section. The first connecting section connects to a side of the third bent portion away from the base. The first connecting section is fixed to the housing and can transfer a force acting on the third bent portion to the outer shell.

[0033] Optionally, in some embodiments of the present application, the first connecting section is parallel to the base, which is conducive to the deformation of the elastic member in the first direction.

[0034] Optionally, in some embodiments of the present application, the third bending portion includes a first bending section and a second bending section, wherein the first bending section connects the base and the second bending section, and the second bending section connects the first connecting section.

[0035] Optionally, in some embodiments of the present application, the first bent section forms a first angle A1 with the base, and the second bent section forms a second angle B1 with the first connecting section, where A1 ≥ B1, which helps increase the first bent section's ability to resist deformation and reduces the risk of deformation of the elastic member in the first direction.

[0036] Optionally, in some embodiments of the present application, the first bending section and the second bending section form a third angle C1, C1>A1, which is conducive to improving the uniform deformation of the third bending portion.

[0037] Optionally, in some embodiments of the present application, C1=2A1=2B1, which is beneficial to further improve the uniform deformation of the third bending portion.

[0038] Optionally, in some embodiments of the present application, the housing includes a first sidewall. The first sidewall is provided with a first fixing portion. Along a first direction, a projection of the first connecting section overlaps with a projection of the first fixing portion. The first connecting section is fixed to the first fixing portion to transfer a force acting on the bent portion to the first sidewall.

[0039] Optionally, in some embodiments of the present application, the structural strength of the first side wall is greater than the structural strength of the elastic member, thereby reducing the risk of deformation of the first side wall due to the force applied to the third bending portion.

[0040] Optionally, in some embodiments of the present application, the elastic member includes a second connecting section. The second connecting section connects to a side of the fourth bent portion away from the base. The second connecting section is fixed to the housing and can transfer the force applied to the fourth bent portion to the housing.

[0041] Optionally, in some embodiments of the present application, the second connecting section is parallel to the base, which is conducive to the deformation of the elastic member in the first direction.

[0042] Optionally, in some embodiments of the present application, the housing includes a bottom wall. The bottom wall is provided with a third fixing portion. Along the first direction, a projection of the second connecting segment overlaps a projection of the third fixing portion. The second connecting segment is fixed to the third fixing portion to transfer a force acting on the bent portion to the bottom wall.

[0043] Optionally, in some embodiments of the present application, the structural strength of the bottom wall is greater than the structural strength of the elastic member, thereby reducing the risk of deformation of the bottom wall due to the force applied to the fourth bend portion.

[0044] Optionally, in some embodiments of the present application, the third bending portion and the fourth bending portion have the same structure, which is conducive to uniform force and uniform deformation.

[0045] An embodiment of the present application further provides an electrical device, comprising the battery module of any of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] FIG1 shows a schematic structural diagram of a battery module in some embodiments.

[0047] FIG. 2 shows an exploded schematic diagram of a battery module in some embodiments.

[0048] FIG3 is a schematic diagram showing a partial structure of a battery module in some embodiments.

[0049] FIG4 is a schematic diagram showing a partial structure of a battery module from another perspective in some embodiments.

[0050] FIG5 is a schematic structural diagram of multiple battery cell units in some embodiments.

[0051] FIG6 shows a schematic structural diagram of a battery cell in some embodiments.

[0052] FIG. 7 is a schematic structural diagram of a battery cell viewed along a direction Y′ opposite to the second direction Y in some embodiments.

[0053] FIG8 shows an exploded schematic diagram of a battery cell in some embodiments.

[0054] FIG9 shows a schematic structural diagram of battery cells in other embodiments.

[0055] FIG10 shows a schematic structural diagram of battery cells in some other embodiments.

[0056] FIG11 is a schematic structural diagram of an electrode assembly in some embodiments.

[0057] FIG12 is a schematic diagram showing the structure of a battery cell and a bracket in some embodiments.

[0058] FIG13 is a schematic structural diagram of a battery cell and a bracket from another perspective in some embodiments.

[0059] FIG14 is a schematic structural diagram of a battery cell and a bracket from another perspective in some embodiments.

[0060] FIG15 is a schematic structural diagram of a battery cell and a bracket viewed in a direction Y′ opposite to the second direction Y in some embodiments.

[0061] FIG16 is a schematic diagram showing a partial structure of the battery cell and the bracket in FIG12 .

[0062] FIG17 shows another partial structural schematic diagram of the battery cell and the bracket in FIG12 .

[0063] FIG18 is a schematic structural diagram showing a stacked connection of electrode terminals of two battery cells in some embodiments.

[0064] FIG19 shows a schematic structural diagram of the two battery cells in FIG18 displaced along the first direction X. FIG.

[0065] FIG20 shows a schematic structural diagram of the two battery cells in FIG18 displaced along the second direction Y. FIG.

[0066] FIG. 21 is a schematic diagram showing a partially enlarged structure in FIG. 20 .

[0067] FIG. 22 is a schematic structural diagram of an elastic member in some embodiments.

[0068] FIG. 23 is a schematic diagram showing a partial structure of a housing in some embodiments.

[0069] FIG24 shows a schematic structural diagram of electrical equipment in some embodiments.

[0070] Description of main component symbols:

[0071] Battery module 100

[0072] Battery cell 10

[0073] Battery 11

[0074] Cell case 11a

[0075] Main body 111

[0076] First wall 111a

[0077] Second wall 111b

[0078] Third wall 111c

[0079] Fourth wall 111d

[0080] Fifth wall 111e

[0081] Sixth wall 111f

[0082] First shell 1111

[0083] First recess 1111a

[0084] Second housing 1112

[0085] Second recess 1112a

[0086] First extended edge 1113

[0087] Second extended edge 1114

[0088] First sealing portion 112

[0089] First connecting portion 112a

[0090] First bent portion 112b

[0091] Second bent portion 112c

[0092] Second sealing portion 113

[0093] Electrode assembly 11b

[0094] First straight section 1116

[0095] The second straight section 1117

[0096] First curved section 1118

[0097] Second curved section 1119

[0098] Electrode terminal 11c

[0099] Stacking area 101

[0100] First section 102

[0101] Second section 103

[0102] Bracket 12

[0103] Part 1121

[0104] First side portion 122

[0105] First gap 122a

[0106] Second side portion 123

[0107] Second gap 123a

[0108] Second connection portion 124

[0109] First extension portion 125

[0110] Second extension portion 126

[0111] The third connecting portion 128

[0112] first convex portion 110

[0113] The third recess 120

[0114] Second convex portion 130

[0115] Fourth recess 140

[0116] Collection component 20

[0117] Sample 21

[0118] Wire 22

[0119] Circuit board 30

[0120] Housing 40

[0121] rear wall 41

[0122] Front wall 42

[0123] First side wall 43

[0124] First fixing portion 431

[0125] Second side wall 44

[0126] Second fixing portion 441

[0127] Top wall 45

[0128] The third limiting portion 451

[0129] Fourth limiting portion 452

[0130] Bottom wall 46

[0131] The third fixing portion 46a

[0132] First limiting portion 461

[0133] Second limiting portion 462

[0134] Elastic member 50

[0135] base 51

[0136] The third bent portion 52

[0137] First bending section 521

[0138] Second bending section 522

[0139] Fourth bent portion 53

[0140] The third bending section 531

[0141] Fourth bending section 532

[0142] Electrical equipment 200

[0143] First direction X

[0144] Second direction Y

[0145] The third direction Z

[0146] The following specific embodiments will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0147] The following detailed description is illustrative and non-limiting. It is intended to provide a basic understanding of the present application and is not intended to identify the key or decisive elements of the present application or to limit the scope of protection. As long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any manner.

[0148] When a component is referred to as being “disposed on” another component, it can be directly disposed on the other component or there may be a component intervening therebetween. When a component is referred to as being “connected to” another component, it can be directly connected to the other component or there may be a component intervening therebetween.

[0149] It can be understood that the terms "perpendicular, equal" are used to describe the ideal state between two components. In actual production or use, there may be a state that is approximately perpendicular or equal between the two components. For example, combined with numerical descriptions, perpendicular can refer to the angle between two straight lines being in the range of 90°±10°, perpendicular can also refer to the dihedral angle between two planes being in the range of 90°±10°, and perpendicular can also refer to the angle between a straight line and a plane being in the range of 90°±10°. The two components described as "perpendicular" may not be absolute straight lines or planes, but may be roughly straight lines or planes. From a macroscopic perspective, a component can be considered a "straight line" or a "plane" if the overall extension direction is a straight line or a plane.

[0150] The term "parallel" is used to describe the ideal state between two components. In actual production or use, there may be a state of approximate parallelism between the two components. For example, combined with numerical descriptions, parallel can refer to the angle between two straight lines being in the range of 180°±10°, parallel can also refer to the dihedral angle between two planes being in the range of 180°±10°, and parallel can also refer to the angle between a straight line and a plane being in the range of 180°±10°. The two components described as "parallel" may not be absolute straight lines or planes, but may be roughly straight lines or planes. From a macroscopic perspective, a component can be considered a "straight line" or a "plane" if its overall extension direction is a straight line or a plane.

[0151] Unless otherwise defined, the term "plurality" herein, when used to describe the number of components, specifically means that the components are two or more.

[0152] In the first direction X, it includes the first direction X and a direction opposite to the first direction X; in the second direction Y, it includes the second direction Y and a direction opposite to the second direction Y; in the third direction Z, it includes the third direction Z and a direction opposite to the third direction Z.

[0153] For the convenience of description, the electrode terminal 11 c is not bent in some drawings.

[0154] Referring to Figures 1 to 6 and 18 , one embodiment of the present application provides a battery module 100 comprising a plurality of battery cell units 10 and a collection assembly 20. The plurality of battery cell units 10 are arranged along a first direction X. Each battery cell unit 10 comprises a battery cell 11 and a bracket 12, which connects the battery cell 11. The battery cell 11 comprises a battery cell housing 11a, an electrode assembly 11b, and an electrode terminal 11c. The electrode terminal 11c is connected to the electrode assembly 11b and extends from the battery cell housing 11a.

[0155] The cell casing 11a includes a main body 111 and a first sealing portion 112. The electrode assembly 11b is located within the main body 111. The first sealing portion 112 includes a first connecting portion 112a, from which the electrode terminal 11c extends. The bracket 12 includes a first portion 121, which covers the first connecting portion 112a. The electrode terminal 11c extends from the first portion 121.

[0156] The collection assembly 20 includes a plurality of sampling pieces 21. At least two electrode terminals 11c and one sampling piece 21 are stacked and connected.

[0157] The present application performs sampling by connecting the electrode terminal 11c through the sampling piece 21, which can reduce process steps and save materials. The first part 121 covers the first connecting portion 112a to improve the toughness of the first connecting portion 112a. By stacking and connecting at least two electrode terminals 11c and a sampling piece 21, the risk of deformation of the electrode terminals 11c and the sampling piece 21 in the stacked portion is reduced, which is conducive to better connection of the sampling piece 21 to the electrode terminal 11c.

[0158] In some embodiments, the electrode terminals 11 c of two adjacent battery cells 11 are stacked and connected to each other, and the sampling member 21 is connected to any one of the electrode terminals 11 c that are connected to each other.

[0159] In some embodiments, the electrode terminals 11 c of the three battery cells 11 are stacked and connected to each other, and the sampling member 21 is connected to any one of the electrode terminals 11 c that are connected to each other.

[0160] In some embodiments, the sampling element 21 can collect electrical signal information of the battery cell 11 , and the electrical signal information includes but is not limited to voltage, current, and temperature.

[0161] In some embodiments, the collection assembly 20 includes a wire 22 , which connects each sampling member 21 .

[0162] In some embodiments, the sampling member 21 is configured to move with the deformation of the electrode terminal 11c, and a portion of the wire 22 is configured to provide displacement space for the sampling member 21. When the electrode terminal 11c deforms, it moves the sampling member 21 along with it, and a portion of the wire 22 moves with the sampling member 21, reducing the risk of the wire 22 pulling on the sampling member 21, causing the sampling member 21 to separate from the electrode terminal 11c or disconnect the sampling member 21 from the wire 22.

[0163] In some embodiments, the sampling member 21 is welded or crimped to at least any one of the interconnected electrode terminals 11 c, such as by laser welding.

[0164] In some embodiments, the main body 111 and the first portion 121 are arranged along the second direction Y, and the first direction X is perpendicular to the second direction Y.

[0165] In some embodiments, the electrode terminals 11 c of two adjacent battery cells 11 are stacked and connected along the second direction Y.

[0166] In some embodiments, the electrode terminals 11 c of N battery cells 11 are stacked and connected along the second direction Y, where N≧3.

[0167] In some embodiments, the sampling member 21 is fixed to the first portion 121 and connected to the electrode terminal 11 c. Optionally, the first portion 121 is provided with a recess (not shown), and the sampling member 21 is connected to the recess.

[0168] In some embodiments, the projections of the electrode terminals 11 c of two adjacent battery cells 11 overlap along the second direction Y. The electrode terminals 11 c of the two adjacent battery cells 11 are bent and stacked to form a stacking region 101. The electrode terminals 11 c of the two adjacent battery cells 11 are bent and connected by welding, for example, laser welding.

[0169] In some embodiments, the electrode terminal 11c and the sample piece 21 are first stacked in sequence, and the stacking region 101 and the non-stacked portion of the sample piece 21 are welded first, and then the stacking region 101 and the stacked portion of the sample piece 21 are welded, wherein the laser welding energy of the second welding is greater than that of the first welding.

[0170] In some embodiments, the electrode terminal 11c and the sample piece 21 are first stacked in sequence, and the stacked portion of the stacked region 101 and the sample piece 21 is welded first, and then the unstacked portion of the stacked region 101 and the sample piece 21 is welded, wherein the laser welding energy of the second welding is less than that of the first welding.

[0171] In some embodiments, along the second direction Y, the projection of the sample member 21 is located within the projection of the stacking region 101. Along the second direction Y, the thickness of the sample member 21 and the stacking region 101 increases. When the electrode terminal 11c deforms, the deformation force is alleviated. Furthermore, the portion of the stacking region 101 not connected to the sample member 21 deforms before the sample member 21, thereby protecting the sample member 21 and reducing the risk of deformation and / or separation of the sample member 21 from the stacking region 101.

[0172] In some embodiments, along the second direction Y, the sampling member 21 is closer to the battery cell casing 11 a than the stacking region 101 .

[0173] In some embodiments, the stacking region 101 and portions of the sampling element 21 are arranged along the second direction Y. In some embodiments, along the second direction Y, the sampling element 21 is disposed between two stacked electrode terminals 11 c.

[0174] In some embodiments, the interconnected electrode terminals 11 c and the sampling member 21 are stacked in a first direction X. Optionally, the sampling member 21 is located between the electrode terminals 11 c. Optionally, the sampling member 21 is located on the leftmost side of the stack. Optionally, the sampling member 21 is located on the rightmost side of the stack.

[0175] In some embodiments, the bracket 12 is integrally formed with the battery cell 11, which can improve the connection strength between the bracket 12 and the battery cell 11. Optionally, the bracket 12 is integrally formed with the battery cell 11 by low-pressure injection molding.

[0176] In some embodiments, the outer surface of the main body 111 may include some insulating parts, such as an insulating film, to better protect the main body.

[0177] In some embodiments, the bracket 12 is an insulating bracket, which can reduce the risk of short circuit between the bracket 12 and the battery cell 11 .

[0178] Referring to Figures 6 to 10, in some embodiments, the main body 111 is provided with a storage space. The main body 111 includes a first shell 1111 and a second shell 1112. The first shell 1111 is provided with a first recess 1111a, and the second shell 1112 is provided with a second recess 1112a. The first shell 1111 is connected to the second shell 1112 to form a storage space. The electrode assembly 11b is partially provided in the first recess 1111a and partially provided in the second recess 1112a. The circumference of the first shell 1111 extends outward to form a first extended edge 1113, and the circumference of the second shell 1112 extends outward to form a second extended edge 1114. After the first shell 1111 is connected to the second shell 1112, the first extended edge 1113 and the second extended edge 1114 overlap and are sealed.

[0179] In some embodiments, the first extended edge 1113 and the second extended edge 1114 overlap and are sealed to form two first sealing portions 112 and two second sealing portions 113. The two first sealing portions 112 are arranged along the second direction Y, and the two second sealing portions 113 are arranged along the third direction Z. One first sealing portion 112 connects the two second sealing portions 113, and the other first sealing portion 112 connects the two second sealing portions 113.

[0180] In some embodiments, the main body 111 includes a first wall 111a, a second wall 111b, a third wall 111c, and a fourth wall 111d. The second wall 111b and the first wall 111a are disposed opposite each other along the second direction Y. The third wall 111c and the fourth wall 111d are disposed opposite each other along the first direction X. One of the first sealing portions 112 is connected to the first wall 111a, and the other first sealing portion 112 is connected to the second wall 111b.

[0181] The main body 111 includes a fifth wall 111e and a sixth wall 111f, which are arranged opposite to each other along the third direction Z. One of the two second sealing parts 113 is connected to the fifth wall 111e, and the other of the two second sealing parts 113 is connected to the sixth wall 111f.

[0182] In some embodiments, the battery cell 11 includes two electrode terminals 11 c , wherein one electrode terminal 11 c extends from one of the first sealing portions 112 out of the battery cell housing 11 a , and the other electrode terminal 11 c extends from the other first sealing portion 112 out of the battery cell housing 11 a .

[0183] Referring to FIG. 9 and FIG. 10 , in some embodiments, the battery cell 11 includes two electrode terminals 11 c and a first sealing portion 112 . The two electrode terminals 11 c extend from the first sealing portion 112 out of the battery cell housing 11 a .

[0184] In some embodiments, the battery cell 11 includes two electrode terminals 11 c and two first sealing portions 112 . The two electrode terminals 11 c extend from the same first sealing portion 112 out of the battery cell housing 11 a .

[0185] Referring to Figures 6 to 8, in some embodiments, the main body 111 includes two first walls 111a, two second walls 111b, and two first sealing portions 112. One of the first walls 111a connects the third wall 111c and the first sealing portion 112, and the other first wall 111a connects the fourth wall 111d and the first sealing portion 112. One of the second walls 111b connects the third wall 111c and the other first sealing portion 112, and the other second wall 111b connects the fourth wall 111d and the other first sealing portion 112. One of the electrode terminals 11c extends from one of the first sealing portions 112 out of the cell housing 11a, and the other electrode terminal 11c extends from the other first sealing portion 112 out of the cell housing 11a.

[0186] Viewed along the direction Y′ opposite to the second direction Y, in the first direction X, the two first walls 111 a are located on opposite sides of the first sealing portion 112 . Viewed along the second direction Y, in the first direction X, the two second walls 111 b are located on opposite sides of another first sealing portion 112 .

[0187] In some embodiments, the main body 111 includes a first wall 111a, a second wall 111b, and two first sealing portions 112. The first wall 111a connects the third wall 111c and the first sealing portion 112, and the second wall 111b connects the third wall 111c and the other first sealing portion 112. The main body 111 has a storage space and includes a first shell 1111 and a second shell 1112. The first shell 1111 has a first recess 1111a, and the second shell 1112 is flat. The first shell 1111 connects to the second shell 1112, forming a storage space. The electrode assembly 11b is located in the first recess 1111a. One electrode terminal 11c extends from one of the first sealing portions 112 out of the cell housing 11a, and the other electrode terminal 11c extends from the other first sealing portion 112 out of the cell housing 11a.

[0188] In some embodiments, the main body 111 includes two first walls 111a, a second wall 111b, and a first sealing portion 112. The main body 111 defines a storage space and includes a first shell 1111 and a second shell 1112. The first shell 1111 connects to the second shell 1112. The first shell 1111 defines a first recess 1111a, and the second shell 1112 defines a second recess 1112a, forming the storage space. The electrode assembly 11b is disposed in the first recess 1111a and the second recess 1112a. Two electrode terminals 11c extend from the same first sealing portion 112 outside the cell shell 11a.

[0189] Optionally, there is one second wall 111b and one first sealing portion 112, wherein one first wall 111a connects the third wall 111c and the first sealing portion 112, and the other first wall 111a connects the fourth wall 111d and the first sealing portion 112. When viewed along a direction Y' opposite to the second direction Y, in the first direction X, the two first walls 111a are located on opposite sides of the first sealing portion 112.

[0190] Optionally, there are two second walls 111b and two first sealing portions 112, wherein one first wall 111a connects the third wall 111c and the first sealing portion 112, and the other first wall 111a connects the fourth wall 111d and the first sealing portion 112. When viewed along a direction Y' opposite to the second direction Y, the two first walls 111a are connected and located on opposite sides of the first sealing portion 112 in the first direction X. One second wall 111b connects the third wall 111c and the other first sealing portion 112, and the other second wall 111b connects the fourth wall 111d and the other first sealing portion 112. When viewed along the second direction Y and in the first direction X, the two second walls 111b are located on opposite sides of the first sealing portion 112.

[0191] Referring to Figure 10 , in some embodiments, the main body 111 includes a first wall 111a, a second wall 111b, and a first sealing portion 112. The main body 111 defines a storage space and includes a first shell 1111 and a second shell 1112. The first shell 1111 defines a first recess 1111a, while the second shell 1112 is flat. The first shell 1111 connects to the second shell 1112, forming a storage space. The electrode assembly 11b is located in the first recess 1111a. Two electrode terminals 11c extend from the first sealing portion 112 and out of the cell shell 11a.

[0192] Optionally, there is one first sealing portion 112 , the first wall 111 a connects the third wall 111 c and the first sealing portion 112 , and the second wall 111 b connects the third wall 111 c .

[0193] Optionally, there are two first sealing portions 112 , wherein the first wall 111 a connects the third wall 111 c and the first sealing portion 112 , and the second wall 111 b connects the third wall 111 c and another first sealing portion 112 .

[0194] Please refer to Figures 5 and 18. In some embodiments, the portion of the electrode terminal 11c extending out of the first part 121 includes a first segment 102 and a second segment 103. The first segments 102 of the electrode terminals 11c of adjacent battery cells 11 are spaced apart along the first direction X, and the second segments 103 of the electrode terminals 11c of adjacent battery cells 11 are stacked along the second direction Y. Along the second direction Y, the length H of the first segment 102 extending out of the first part 121 satisfies 2mm≤H≤20mm. When two adjacent battery cells 11 undergo relative displacement, the electrode terminal 11c is easily deformed in the first direction X, the second direction Y, and the third direction Z, which is beneficial to reducing the pulling on the stacking area 101 and the sampling piece 21, and reducing the risk of deformation of the stacking area 101 and the sampling piece 21. H can be any one of 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, and 20mm.

[0195] In some embodiments, H satisfies 3 mm ≤ H ≤ 15 mm, which further facilitates deformation of the electrode terminal 11 c in the first direction X, the second direction Y, and the third direction Z, and further helps to reduce the pulling on the electrode terminal 11 c.

[0196] In some embodiments, the first portion 121 surrounds the outer side of the electrode terminal 11 c to enhance protection of the electrode terminal 11 c and help increase the strength of the electrode terminal 11 c.

[0197] Please refer to Figures 18 and 19. In some embodiments, when the battery cell 11 is displaced in the first direction X, at least one of the two first sections 102 of the adjacent electrode terminals 11c is deformed, so that the stacking area 101 and the sampling piece 21 formed by parts of the two second sections 103 are displaced toward the main body 111. The deformation of the electrode terminal 11c alleviates the pulling of the stacking area 101 and the sampling piece 21 caused by the displacement of the battery cell 11 in the first direction X, thereby reducing the risk of deformation of the stacking area 101 and the sampling piece 21.

[0198] Please refer to Figures 18, 20 and 21. In some embodiments, when the battery cell 11 is displaced in the second direction Y, the stacking area 101 and the sampling piece 21 formed by the two second sections 103 are tilted relative to the main body 111. The deformation of the electrode terminal 11c alleviates the pulling of the stacking area 101 and the sampling piece 21 caused by the displacement of the battery cell 11 in the second direction Y, thereby reducing the risk of deformation of the stacking area 101 and the sampling piece 21.

[0199] In some embodiments, when the battery cell 11 is displaced in the second direction Y, the first segment 102 and the second segment 103 of the electrode terminal 11c of one battery cell 11 are set at an acute angle α, and the first segment 102 and the second segment 103 of the electrode terminal 11c of the other battery cell 11 are set at an obtuse angle β.

[0200] In some embodiments, when the battery cell 11 is displaced in the second direction Y, the height of one of the battery cells 11 along the second direction Y is higher than that of the other battery cell 11, and the first section 102 of the electrode terminal 11c of the battery cell 11 located at the higher position is deformed to further alleviate the pulling of the electrode terminal 11c caused by the displacement of the battery cell 11 in the second direction Y.

[0201] Referring to FIG. 18 , in some embodiments, when the battery cell 11 is displaced in the third direction Z, the un-overlapped portion of the first segment 102 and the second segment 103 of the electrode terminal 11c of one battery cell 11 partially rotates along the third direction Z, and the un-overlapped portion of the first segment 102 and the second segment 103 of the electrode terminal 11c of the other battery cell 11 partially rotates along a direction Z' opposite to the third direction Z. The deformation of the electrode terminal 11c alleviates the pulling of the stacking region 101 and the sampling member 21 caused by the displacement of the battery cell 11 in the second direction Y, thereby reducing the risk of deformation of the stacking region 101 and the sampling member 21.

[0202] It is understandable that when the battery cell 11 expands, vibrates, falls, or other operating conditions, the battery cell 11 may be displaced in one direction or in multiple directions.

[0203] Referring to Figures 6 and 11 , in some embodiments, the electrode assembly 11b has a wound structure and includes a first straight segment 1116, a second straight segment 1117, a first curved segment 1118, and a second curved segment 1119. The first straight segment 1116 connects the first curved segment 1118 and the second curved segment 1119, while the second straight segment 1117 connects the first curved segment 1118 and the second curved segment 1119. Along the first direction X, the projection of the third wall 111c overlaps the projection of the first straight segment 1116, the projection of the fourth wall 111d overlaps the projection of the first straight segment 1116, the projection of the third wall 111c overlaps the projection of the second straight segment 1117, and the projection of the fourth wall 111d overlaps the projection of the second straight segment 1117. This facilitates uniform pressure application between the battery cells 11, further improving the service life of the battery cells 11.

[0204] In some embodiments, the first sealing portion 112 includes a first bending portion 112b and a second bending portion 112c, which are disposed opposite to each other along the third direction Z. The first bending portion 112b is connected to the second bending portion 112c via the first connecting portion 112a.

[0205] In some embodiments, when observed along the direction Y' opposite to the second direction Y, in the first direction X, the first portion 121 does not extend beyond the third wall 111c, and the first portion 121 does not extend beyond the fourth wall 111d. When the main bodies 111 of adjacent battery cells 11 apply pressure to each other, the force on the first sealing portion 112 can be reduced, thereby improving the protection of the first sealing portion 112.

[0206] In some embodiments, the bracket 12 includes a first side portion 122 and a second side portion 123. One end of the first portion 121 is connected to the first side portion 122, and the other end is connected to the second side portion 123, which can increase the structural strength of the bracket 12. The first side portion 122 covers the first bent portion 112b, and the second side portion 123 covers the second bent portion 112c, thereby protecting the first sealing portion 112.

[0207] In some embodiments, when viewed along a direction Y' opposite to the second direction Y, in the first direction X, the first side portion 122 is located between the third wall 111c and the fourth wall 111d. When the main bodies 111 of adjacent battery cells 11 apply pressure to each other, the force on the first sealing portion 112 can be reduced, thereby improving the protection of the first sealing portion 112.

[0208] In some embodiments, when viewed along a direction Y' opposite to the second direction Y, in the first direction X, the second side portion 123 is located between the third wall 111c and the fourth wall 111d. When the main bodies 111 of adjacent battery cells 11 apply pressure to each other, the force on the first sealing portion 112 can be reduced, thereby improving the protection of the first sealing portion 112.

[0209] In some embodiments, along the second direction Y, the projection of the first side portion 122 overlaps with the projection of the first curved section 1118, the projection of the first side portion 122 is separated from the projection of the first straight section 1116, and the projection of the first side portion 122 is separated from the projection of the second straight section 1117, which is conducive to pressure relief.

[0210] In some embodiments, along the second direction Y, the projection of the second side 123 overlaps with the projection of the second curved section 1119, the projection of the second side 123 is separated from the projection of the first straight section 1116, and the projection of the second side 123 is separated from the projection of the second straight section 1117, which is conducive to pressure relief.

[0211] In some embodiments, the bracket 12 includes a second connecting portion 124 that covers at least a portion of the first wall 111a. One end of the second connecting portion 124 is connected to the first side portion 122, and the other end is connected to the second side portion 123, further enhancing the structural strength of the bracket 12. When viewed in a direction Y' opposite to the second direction Y, in the first direction X, the second connecting portion 124 does not extend beyond the third wall 111c, and the second connecting portion 124 does not extend beyond the fourth wall 111d.

[0212] The main bodies 111 of adjacent battery cells 11 can be in contact and connected, and the adjacent battery cells 11 apply pressure to each other through the main bodies 111, which can reduce the force on the first sealing part 112, improve the protection of the first sealing part 112, and reduce the buffer parts between adjacent battery cells 11 that provide expansion space for the battery cells 11, thereby reducing the occupied space and thereby improving the energy density of the battery module 100.

[0213] In some embodiments, there is pressure between adjacent battery cell casings 11 a to improve the performance of the battery cell 11 .

[0214] In some embodiments, the bracket 12 includes a first extension portion 125 extending from the first side portion 122. The first extension portion 125 can protect the fifth wall 111e and the second sealing portion 113, thereby increasing the connection strength between the bracket 12 and the battery cell 11.

[0215] Optionally, in the second direction Y, part of the fifth wall 111e and part of the second sealing portion 113 are provided with a first extension portion 125, which can protect part of the main body 111 and part of the second sealing portion 113, increase the connection strength between the bracket 12 and the battery cell 11, and facilitate the bracket 12 to be integrally formed in the battery cell 11.

[0216] Optionally, in the second direction Y, the entire fifth wall 111e and the entire second sealing portion 113 are provided with a first extension portion 125, which can better protect the main body 111 and the second sealing portion 113 and better increase the connection strength between the bracket 12 and the battery cell 11.

[0217] In some embodiments, when viewed along a direction Y' opposite to the second direction Y, in the first direction X, the first side portions 122 do not extend beyond the first extension portion 125, and a first gap 122a is formed between adjacent first side portions 122. When adjacent main bodies 111 are in contact and connected, and apply pressure to each other, the force acting on the first side portions 122 is reduced, thereby reducing the force acting on the first sealing portion 112, thereby facilitating protection of the first sealing portion 112. The first gap 122a also facilitates heat dissipation from the battery cell 11.

[0218] In some embodiments, the bracket 12 includes a second extension portion 126 extending from the second side portion 123. The second extension portion 126 can protect the sixth wall 111f and the other second sealing portion 113, thereby increasing the connection strength between the bracket 12 and the battery cell 11 and facilitating the integral molding of the bracket 12 with the battery cell 11.

[0219] Optionally, in the second direction Y, a portion of the sixth wall 111f and a portion of another second sealing portion 113 are provided with a second extension portion 126, which can protect part of the main body 111 and part of the second sealing portion 113, increase the connection strength between the bracket 12 and the battery cell 11, and facilitate the bracket 12 to be integrally formed in the battery cell 11.

[0220] Optionally, in the second direction Y, the entire sixth wall 111f and the entire other second sealing portion 113 are provided with a second extension portion 126, which can better protect the main body 111 and the second sealing portion 113 and better increase the connection strength between the bracket 12 and the battery cell 11.

[0221] In some embodiments, when viewed along a direction Y' opposite to the second direction Y, in the first direction X, the second side portions 123 do not extend beyond the second extension portion 126, and a second gap 123a is formed between adjacent second side portions 123. When adjacent main bodies 111 are in contact and connected, and pressure is applied to each other, the second gap 123a can reduce the force acting on the second side portions 123, thereby further reducing the force acting on the first sealing portion 112, further facilitating protection of the first sealing portion 112. The second gap 123a also facilitates heat dissipation from the battery cell 11.

[0222] In some embodiments, when viewed along the first direction X, a portion of the first connection portion 112a is located between the main body 111 and the first portion 121 in the second direction Y, and a portion of the first connection portion 112a is located between the first side portion 122 and the second side portion 123 in the third direction Z. The bracket 12 covers the portion of the first connection portion 112a, thereby increasing protection for the first sealing portion 112. By locating the portion of the first connection portion 112a between the main body 111 and the first portion 121 and between the first side portion 122 and the second side portion 123, expansion space is provided for the first sealing portion 112, facilitating pressure relief, reducing the impact of the pressure within the battery cell 11 on the first connection portion 112a, minimizing the impact on the sealing performance of the first sealing portion 112, and facilitating heat dissipation from the first sealing portion 112.

[0223] In some embodiments, the battery cell 11 includes an electrolyte, which is disposed within the battery cell housing 11a. The electrode assembly 11b includes a first electrode sheet, a separator, and a second electrode sheet, which are formed by winding or stacking the first electrode sheet, the separator, and the second electrode sheet. Part of the electrolyte infiltrates the first electrode sheet, the separator, and the second electrode sheet to conduct ions, while part of the electrolyte adheres to the surface of the battery cell housing 11a and / or the surface of the electrode assembly 11b in a free state. The free electrolyte is referred to as the free electrolyte. When multiple battery cells 11 are circulated, the free electrolyte within the battery cells 11 is squeezed.

[0224] In the present application, in the second direction Y, part of the first connecting portion 112a is located between the main body 111 and the first portion 121, and in the third direction Z, part of the first connecting portion 112a is located between the first side portion 122 and the second side portion 123 to provide expansion space for the first sealing portion 112, thereby reducing the impact of the expansion of the battery cell 11 on the sealing of the first sealing portion 112.

[0225] In some embodiments, the bracket 12 includes a third connecting portion 128, which connects to the second portion 127 and the first portion 121. Along the first direction X, the third connecting portion 128 is located between adjacent electrode terminals 11c, with the projection of the third connecting portion 128 overlapping the projection of the electrode terminal 11c. The third connecting portion 128 connects to the portion of the electrode terminal 11c extending beyond the cell casing 11a. Along the first direction X, the third connecting portion 128 supports the electrode terminal 11c extending beyond the first connecting portion 112a, facilitating the bending connection of the electrode terminals 11c of two adjacent battery cells 11.

[0226] Referring to Figures 12 and 13 , in some embodiments, along a first direction X, the bracket 12 includes a first protrusion 110 and a third recess 120. The third recess 120 is disposed on the second extension 126, and the first protrusion 110 extends from the second extension 126. When the main bodies 111 of adjacent battery cells 11 are in contact and connected, the first protrusion 110 is disposed within the third recess 120 of the adjacent bracket 12, with a gap being provided between the first protrusion 110 and the third recess 120. The third recess 120 and the first protrusion 110 position adjacent brackets 12, reducing the offset of adjacent main bodies 111 and facilitating mutual pressure between the multiple main bodies 111. The gap between the first protrusion 110 and the third recess 120 reduces the stress on the bracket 12, improves the protection of the first sealing portion 112, and increases the connection strength between the bracket 12 and the battery cell 11.

[0227] In some embodiments, along the first direction X, the bracket 12 includes a second protrusion 130 and a fourth recess 140. The fourth recess 140 is disposed in the first extension 125, and the second protrusion 130 extends from the first extension 125. When the main bodies of adjacent battery cells 11 are in contact and connected, the second protrusion 130 is disposed within the fourth recess 140 of the adjacent bracket 12, and a gap exists between the second protrusion 130 and the fourth recess 140. The fourth recess 140 and the second protrusion 130 further position adjacent brackets 12, further reducing the offset of adjacent main bodies 111 and further facilitating mutual pressure between the multiple main bodies 111. The gap between the second protrusion 130 and the fourth recess 140 reduces the force applied to the bracket 12, further improving the protection of the first sealing portion 112 and further increasing the connection strength between the bracket 12 and the battery cell 11.

[0228] In some embodiments, the battery cell unit 10 includes two brackets 12, one of which is connected to a portion of the first sealing portion 112, and the other bracket 12 is connected to a portion of the other first sealing portion 112. One electrode terminal 11c extends from the first sealing portion 112 and the bracket 12 in the second direction Y, and the other electrode terminal 11c extends from the other first sealing portion 112 and the bracket 12 in a direction opposite to the second direction Y.

[0229] In some embodiments, the two brackets 12 included in the battery cell unit 10 have the same structure.

[0230] In some embodiments, the battery module includes two collection assemblies 20, each of which includes a wire 22 and a sampling member 21. The main body 111 includes two first sealing portions 112. The two first sealing portions 112 are arranged along the second direction Y. The battery cell 11 includes two electrode terminals 11c. One of the sampling members 21 connects the stacked electrode terminals 11c of two adjacent battery cells 11 whose first sealing portions 112 extend along the second direction Y. The other sampling member 21 connects the stacked electrode terminals 11c of two adjacent battery cells 11 whose first sealing portions 112 extend in a direction opposite to the second direction Y.

[0231] Please refer to Figures 2 to 5. In some embodiments, when the battery cell 11 includes two electrode terminals 11c, one of which extends from the first sealing portion 112 to the battery cell shell 11a, and the other electrode terminal 11c extends from the other first sealing portion 112 to the battery cell shell 11a, the sampling piece 21 includes two, one of which connects the interconnected electrode terminals 11c of two adjacent battery cells 11 on one side, and the other sampling piece 21 connects the interconnected electrode terminals 11c of two adjacent battery cells 11 on the other side.

[0232] Please refer to Figure 2. In some embodiments, the battery module 100 includes a circuit board 30, and the battery cell unit 10 and the circuit board 30 are arranged along the first direction X. The circuit board 30 is connected to the wire 22 and can receive data collected by the sampling component 21. The circuit board 30 includes a BMS component (Battery Management System). The BMS component includes a plurality of electronic components. The plurality of electronic components can realize functions such as control, protection, communication, power calculation, signal transmission, and power transmission of the battery cell 11. Optionally, the circuit board 30 includes a flexible printed circuit (FPC). Optionally, the circuit board 30 includes a printed circuit board (PCB), and a plurality of wires (not shown) are provided on the circuit board 30.

[0233] Referring to Figures 1 and 2 , in some embodiments, the battery module 100 further includes a housing 40, which includes a rear wall 41, a front wall 42, a first side wall 43, a second side wall 44, a top wall 45, and a bottom wall 46. The front wall 42 and the rear wall 41 are arranged along a first direction X, the second side wall 44 and the first side wall 43 are arranged along a second direction Y, and the bottom wall 46 and the top wall 45 are arranged along a third direction Z. The rear wall 41 connects the first side wall 43, the second side wall 44, the top wall 45, and the bottom wall 46, and the rear wall 41 connects the first side wall 43, the second side wall 44, the top wall 45, and the bottom wall 46 to form a receiving space, within which the battery cell unit 10 is disposed.

[0234] Referring to Figures 2 and 22, in some embodiments, the battery module 100 further includes an elastic member 50, which is disposed between the battery cell unit 10 and the housing 40. The elastic member 50 is fixedly connected to the housing 40, and can apply pressure to the battery cell 11 and provide expansion space. Optionally, the elastic member 50 is disposed between the battery cell unit 10 and the rear wall 41. Optionally, the elastic member 50 is disposed between the battery cell unit 10 and the front wall 42. Optionally, the battery module 100 includes two elastic members 50, one of which is disposed between the battery cell unit 10 and the rear wall 41, and the other elastic member 50 is disposed between the battery cell unit 10 and the front wall 42.

[0235] In some embodiments, the elastic member 50 includes a base 51, a third bend 52, and a fourth bend 53. The fourth bend 53 and the third bend 52 are arranged along the third direction Z. The third bend 52 is connected to the fourth bend 53 via the base 51. The base 51 is configured to apply pressure to the battery cell unit 10. The pressure of the third bend 52 and the fourth bend 53 acts on the multiple battery cells 10 through the base 51. The third bend 52 and the fourth bend 53 are configured to provide expansion space for the battery cell unit 10. When the battery cell 11 expands, the third bend 52 and the fourth bend 53 contract.

[0236] In some embodiments, the third bending portion 52 is fixedly connected to the first side wall 43 and the second side wall 44 , and the fourth bending portion 53 is fixedly connected to the bottom wall 46 .

[0237] In some embodiments, the third bending portion 52 is fixedly connected to the top wall 45 and the bottom wall 46 , and the fourth bending portion 53 is fixedly connected to the top wall 45 and the bottom wall 46 .

[0238] In some embodiments, when the battery cell 11 is not expanded, the elastic member 50 does not apply pressure to the battery cell unit 10 , and the elastic member 50 is connected to the battery cell 11 . When the battery cell 11 expands, the battery cell 11 compresses the elastic member 50 , and the elastic member 50 provides pressure to the battery cell 11 .

[0239] In some embodiments, when the battery cell 11 is not expanded, the elastic member 50 provides a compressive force to the battery cell 11 . When the battery cell 11 expands, the battery cell 11 compresses the elastic member 50 , and the elastic member 50 provides more compressive force to the battery cell 11 .

[0240] In some embodiments, the base 51 is connected to the main body 111 of the outermost battery cell 11. The base 51 is provided with a plurality of protrusions 511 spaced apart along the first direction X. The protrusions 511 are formed by recessing away from the main body 111 on the side of the base 51 facing the main body 111. This increases the structural strength of the base 51 and reduces the risk of deformation of the base 51 due to uneven force on the base 51.

[0241] In some embodiments, the elastic member 50 includes a first connecting section 54, which is connected to a side of the third bent portion 52 facing away from the base 51. The first connecting section 54 is fixedly connected to the housing 40, and the third bent portion 52 is fixedly connected to the housing 40 via the first connecting section 54, so that the force applied to the third bent portion 52 can be transferred to the housing 40. For example, the fixing method may be welding, bonding, abutting, clamping, or screwing.

[0242] In some embodiments, the first connecting section 54 is parallel to the base 51 , which facilitates deformation of the elastic member 50 in the first direction X.

[0243] In some embodiments, the elastic member 50 includes a second connecting section 55, which is connected to a side of the fourth bent portion 53 facing away from the base 51. The second connecting section 55 is fixedly connected to the housing 40, and the fourth bent portion 53 is fixedly connected to the housing 40 via the second connecting section 55, so that the force applied to the fourth bent portion 53 can be transferred to the housing 40. For example, the fixing method may be welding, bonding, abutting, clamping, or screwing.

[0244] In some embodiments, the second connecting section 55 is parallel to the base 51 , which facilitates deformation of the elastic member 50 in the first direction X.

[0245] In some embodiments, the first sidewall 43 defines a first fixing portion 431 . Along the first direction X, the projection of the first connecting segment 54 overlaps with the projection of the first fixing portion 431 . The first connecting segment 54 is fixed to the first fixing portion 431 .

[0246] In some embodiments, the second sidewall 44 defines a second fixing portion 441 . Along the first direction X, a projection of the first connecting segment 54 overlaps with a projection of the second fixing portion 441 . The first connecting segment 54 is fixed to the second fixing portion 441 .

[0247] In some embodiments, the first fixing portion 431 is closer to the battery cell unit 10 than the first connecting segment 54 , which facilitates fixing the first fixing portion 431 to the first connecting segment 54 .

[0248] In some embodiments, the second fixing portion 441 is closer to the battery cell unit 10 than the first connecting segment 54 , which facilitates fixing the second fixing portion 441 to the first connecting segment 54 .

[0249] In some embodiments, the structural strength of the first sidewall 43 is greater than the structural strength of the elastic member 50 , thereby reducing the risk of deformation of the first sidewall 43 due to the force acting on the third bent portion 52 .

[0250] In some embodiments, the structural strength of the second sidewall 44 is greater than the structural strength of the elastic member 50 , thereby reducing the risk of deformation of the second sidewall 44 due to the force applied to the third bent portion 52 .

[0251] In some embodiments, the thickness of the first side wall 43 is greater than the thickness of the base 51, the third bend portion 52 and the first connecting section 54, thereby improving the structural strength of the first side wall 43 and reducing the risk of deformation of the first side wall 43 due to the force exerted on the third bend portion 52.

[0252] In some embodiments, the thickness of the second side wall 44 is greater than the thickness of the base 51, the third bend portion 52 and the first connecting section 54, thereby improving the structural strength of the second side wall 44 and reducing the risk of deformation of the second side wall 44 due to the force exerted on the third bend portion 52.

[0253] In some embodiments, the bottom wall 46 is provided with a third fixing portion 46 a. Along the first direction X, the projection of the bottom wall 46 overlaps with the projection of the third fixing portion 46 a. The second connecting section 55 is fixed to the third fixing portion 46 a. For example, the fixing is performed by welding, bonding, abutting, clamping, screwing, etc.

[0254] In some embodiments, the third fixing portion 46 a is closer to the battery cell unit 10 than the second connecting segment 55 , which facilitates fixing the third fixing portion 46 a to the second connecting segment 55 .

[0255] In some embodiments, the structural strength of the bottom wall 46 is greater than the structural strength of the elastic member 50 , thereby reducing the risk of deformation of the bottom wall 46 due to the force applied to the third bent portion 52 .

[0256] In some embodiments, the thickness of the bottom wall 46 is greater than the thickness of the base 51, the fourth bend portion 53, and the second connecting section 55, thereby improving the structural strength of the bottom wall 46 and reducing the risk of deformation of the bottom wall 46 due to the force exerted on the fourth bend portion 53.

[0257] In some embodiments, the third bent portion 52 includes a first bent section 521 and a second bent section 522. The first bent section 521 connects to the base 51, and the second bent section 522 connects the first bent section 521 and the first connecting section 54. The first bent section 521 and the base 51 form a first angle A1, the second bent section 522 and the first connecting section 54 form a second angle B1, and the first bent section 521 and the second bent section 522 form a third angle C1. A1 ≥ B1, which helps to increase the ability of the first bent section 521 to resist deformation and helps reduce the risk of deformation of the elastic member 50 in the first direction X.

[0258] In some embodiments, C1>A1, which is beneficial to improving the uniform deformation of the third bending portion 52.

[0259] In some embodiments, C1=2B1=2A1, which is beneficial to further improve the uniform deformation of the third bending portion 52.

[0260] In some embodiments, the fourth bent portion 53 includes a third bent segment 531 and a fourth bent segment 532. The third bent segment 531 connects to the base portion 51, and the fourth bent segment 532 connects to the third bent segment 531 and the second connecting segment 55. The third bent segment 531 and the base portion 51 form a first angle A2, the fourth bent segment 532 and the second connecting segment 55 form a second angle B2, and the third bent segment 531 and the fourth bent segment 532 form a third angle C2. A2 ≥ B2 helps increase the third bent segment 531's ability to resist deformation and reduces the risk of deformation of the elastic member 50 in the first direction X.

[0261] In some embodiments, C2>A2, which is beneficial to improving the uniform deformation of the fourth bending portion 53.

[0262] In some embodiments, C2=2B 21 =2A2, which is beneficial to further improve the uniform deformation of the fourth bending portion 53.

[0263] Optionally, the fourth bend 53 is set at the same angle as the third bend 52. When the third bend 52 and the fourth bend 53 are subjected to force, they can be evenly stressed and deformed, reducing the risk of uneven deformation causing the elastic member 50 to rotate. Optionally, A1 = A2, B1 = B2, and C1 = C2.

[0264] Referring to Figures 2 and 23, in some embodiments, the bottom wall 46 is provided with a first limiting portion 461 and a second limiting portion 462. The first limiting portion 461 extends along a first direction X, and the second limiting portion 462 extends along the first direction X. The second limiting portion 462 and the first limiting portion 461 are arranged in a second direction Y. The first limiting portion 461 and the second limiting portion 462 are projecting from a surface of the bottom wall 46 opposite the top wall 45 in a direction opposite to the third direction Z. When the bracket 12 is positioned within the housing 40, the bracket 12 is positioned between the first limiting portion 461 and the second limiting portion 462. The first limiting portion 461 and the second limiting portion 462 guide the movement of the battery cell 10. The first limiting portion 461 and the second limiting portion 462 restrict the movement of the bracket 12 along the second direction Y, thereby facilitating the bracket's movement along the first direction X.

[0265] Referring to Figure 2 , in some embodiments, the top wall 45 is provided with a third limiting portion 451 and a fourth limiting portion 452. The third limiting portion 451 extends along a first direction X, and the fourth limiting portion 452 extends along the first direction X. The fourth limiting portion 452 and the third limiting portion 451 are arranged in a second direction Y. The first limiting portion 461 and the third limiting portion 451 are arranged along a third direction Z, and the second limiting portion 462 and the fourth limiting portion 452 are arranged along the third direction Z. The third limiting portion 451 and the fourth limiting portion 452 are protruding from the surface of the top wall 45 opposite the bottom wall 46 along the third direction Z. When the bracket 12 is positioned within the housing 40, the bracket 12 is positioned between the third limiting portion 451 and the fourth limiting portion 452. The third limiting portion 451 and the fourth limiting portion 452 further guide the movement of the battery cell 10. When the battery cell 11 expands, the third limiting portion 451 and the fourth limiting portion 452 can limit the movement of the bracket 12 along the second direction Y, which is beneficial for the bracket 12 to move along the first direction X.

[0266] Referring to FIG. 24 , the present application further provides an electrical device 200 employing the battery module 100. In one embodiment, the electrical device 200 of the present application may be, but is not limited to, electronic equipment, drones, backup power supplies, electric vehicles, electric motorcycles, electric power-assisted bicycles, power tools, large household battery modules, and the like.

[0267] Those skilled in the art should recognize that the above embodiments are merely intended to illustrate the present application and are not intended to limit the present application. As long as they are within the spirit of the present application, appropriate changes and modifications to the above embodiments fall within the scope disclosed in the present application.

Claims

1. A battery module, characterized in that: include: A plurality of battery cell units arranged along a first direction, each of the battery cell units comprising a battery cell and a bracket, the battery cell comprising an electrode assembly, a battery cell housing and an electrode terminal, the electrode terminal being connected to the electrode assembly and led out from the battery cell housing; The battery cell housing comprises a main body and a first sealing portion, and the electrode assembly is arranged on the main body; The first sealing portion includes a first connecting portion, and the electrode terminal extends out of the battery cell housing from the first connecting portion; The bracket includes a first portion, the first portion covers a portion of the first connecting portion, and the electrode terminal extends from the first portion; A collection assembly, including a plurality of sampling pieces; At least two of the electrode terminals and one of the sampling members are stacked and connected.

2. The battery module according to claim 1, characterized in that: The collection assembly includes a wire, and the wire connects each of the sampling members.

3. The battery module according to claim 2, characterized in that: The sampling member is welded or crimped to at least any one of the interconnected electrode terminals.

4. The battery module according to any one of claims 1 to 3, characterized in that: The electrode terminals of two adjacent cells extend out of the first portion and are stacked and connected to form a stacking area, and the main body and the first portion are arranged in a second direction; Along the second direction, the projection of the sampling member is located within the projection of the stacking area, and the second direction is perpendicular to the first direction.

5. The battery module according to claim 4, characterized in that: Along the second direction, the sampling member is closer to the battery cell casing than the stacking area.

6. The battery module according to any one of claims 1 to 5, characterized in that: The portion of the electrode terminal extending out of the first part includes a first segment and a second segment. The first segments of the electrode terminals of adjacent battery cells are spaced apart along the first direction, and the second segments of the electrode terminals of adjacent battery cells are stacked along the second direction. Along the second direction, the first segment extends out of the first part by a length H, 2mm≤H≤20mm.

7. The battery module according to claim 6, characterized in that: The first sealing portion includes a first bending portion and a second bending portion, and the first bending portion is connected to the second bending portion through the first connecting portion; The bracket includes a first side portion covering the first bending portion and a second side portion covering the second bending portion, and the first side portion and the second side portion are arranged along a third direction; The first direction, the second direction and the third direction are perpendicular to each other.

8. The battery module according to claim 7, characterized in that: Viewed along the first direction, in the second direction, part of the first connection portion is located between the main body and the first portion, and in the third direction, part of the first connection portion is located between the first side portion and the second side portion.

9. The battery module according to any one of claims 1 to 8, characterized in that: There is pressure between adjacent battery cell casings.

10. The battery module according to any one of claims 1 to 9, characterized in that: The main bodies of adjacent battery cells are in contact and connected.

11. The battery module according to any one of claims 1 to 10, characterized in that: The battery cell housing comprises a first wall, a second wall, a third wall and a fourth wall, wherein the second wall is arranged opposite to the first wall along a second direction, and the third wall is arranged opposite to the fourth wall along the first direction; Viewed along a direction opposite to the second direction, in the first direction, the first portion does not extend beyond the third wall, and the first portion does not extend beyond the fourth wall.

12. The battery module according to claim 11, characterized in that: The electrode assembly is a winding structure, including a first straight section, a second straight section, a first curved section, and a second curved section, wherein the first straight section connects the first curved section and the second curved section, and the second straight section connects the first curved section and the second curved section; Along the first direction, the projection of the third wall covers the projection of the first straight section. The projections of the four walls cover the projection of the second straight section.

13. The battery module according to any one of claims 1 to 12, characterized in that: The bracket is integrally formed on the battery core.

14. The battery module according to any one of claims 1 to 13, characterized in that: The bracket is an insulating bracket.

15. The battery module according to any one of claims 1 to 14, characterized in that: The first portion is disposed around at least a portion of the electrode terminal.

16. The battery module according to claim 2, characterized in that: The sampling member is configured to be displaced along with the deformation of the electrode terminal, and the portion of the wire is configured to move along with the sampling member.

17. An electrical equipment, characterized in that: Comprising a battery module as described in any one of claims 1-16.

Images