Battery module, battery pack, and electric device

Abstract

Provided in the embodiments of the present application are a battery module, a battery pack, and an electric device. The battery module comprises a housing, a battery cell assembly, an elastic member, a first conductive member, and a first fixing member. The battery cell assembly comprises a plurality of battery cell units, and the battery cell assembly is accommodated in the housing. The elastic member is accommodated in the housing, and the battery cell assembly and the elastic member are arranged in a first direction. The first conductive member is connected to the battery cell assembly. The first conductive member and the elastic member are fixed by means of the first fixing member.

Description

Battery modules, battery packs and electrical equipment Technical Field

[0001] The present application relates to the field of battery technology, and more specifically, to a battery module, a battery pack, and an electrical device. Background Art

[0002] Rechargeable batteries are batteries that can be recharged after discharge to activate the active materials and continue to be used. Rechargeable batteries are widely used in electronic devices such as mobile phones, laptops, and drones.

[0003] Battery modules typically consist of multiple cells to meet the voltage requirements of electronic devices. Improving the safety of battery modules has been a key research topic in the battery industry as battery technology evolves.

[0004] Summary of the Invention

[0005] The present application provides a battery module, a battery pack, and an electrical device, which can improve safety.

[0006] In a first aspect, embodiments of the present application provide a battery module comprising a housing, a cell assembly, an elastic member, a first conductive member, and a first fixing member. The cell assembly comprises a plurality of cell units, and the cell assembly is housed in the housing. The elastic member is housed in the housing, and the cell assembly and the elastic member are arranged along a first direction. The first conductive member is connected to the cell assembly. The first conductive member and the elastic member are secured by a first fixing member.

[0007] The first fixing member secures the first conductive member to the elastic member. When the battery module is subjected to external forces, the first fixing member limits the first conductive member, thereby reducing movement of the first conductive member and lowering the risk of short circuits. The first conductive member and the first fixing member are fixed to the elastic member. The first fixing member acts as a buffer when the battery module is subjected to external forces, reducing the stress at the connection between the first conductive member and the first fixing member, lowering the risk of cracking or failure of the first conductive member, and improving the stability and reliability of the battery module.

[0008] In one or more optional embodiments above, the elastic member includes a base, a connecting portion, and a buffer portion, wherein the base is connected to the battery core assembly, the connecting portion is fixed to the housing, and the buffer portion connects the base and the connecting portion. The first fixing member is fixed to the connecting portion.

[0009] The buffer portion elastically deforms when the cell assembly expands, relieving the expansion force and improving the charge and discharge performance of the cell assembly. Furthermore, during the expansion and contraction of the cell assembly, the buffer portion applies an elastic force to the base portion, thereby improving the stability of the base-cell contact and reducing the risk of cell assembly movement within the housing. Securing the first fixture to the connecting portion improves its stability and reduces its movement when the battery module is subjected to external forces.

[0010] In one or more optional embodiments above, the battery cell assembly includes N battery cell units, each battery cell unit includes a battery cell, the thickness of each battery cell is D mm, and the elastic member is configured such that when the battery cell assembly moves a first distance along a first direction, the buffer portion and the first fixing member are separated.

[0011] In the embodiment of the present application, when the battery cell assembly expands, the buffer portion and the first fixing member can be separated, thereby reducing the risk of interference between the first fixing member and the buffer portion.

[0012] In one or more optional embodiments above, the first distance is W, where W is greater than or equal to N×D×0.05, which can provide space for expansion and deformation of the battery cell assembly and reduce the expansion force.

[0013] In one or more of the above optional embodiments, W is less than or equal to N×D×0.15.

[0014] In one or more optional embodiments above, W is less than or equal to N×D×0.10, so as to limit the expansion and deformation of the battery cell assembly to a smaller range and improve the charge and discharge performance of the battery cell assembly.

[0015] In one or more optional embodiments above, part of the first conductive member is fixed to the first side of the connecting portion by the first fixing member, the first side being the side away from the buffer portion. This embodiment of the application can reduce the risk of interference between the first conductive member and the buffer portion.

[0016] In one or more of the above optional embodiments, the first fixing member includes a cable tie, the connecting portion is provided with a first through-hole, the first fixing member passes through the first through-hole, and a portion of the first conductive member is fixed to the first side of the connecting portion via the first fixing member. The first fixing member can be tied to the first conductive member to secure the portion of the first conductive member to the first side of the connecting portion.

[0017] In one or more of the above optional embodiments, the first conductive member is configured so that when the battery cell assembly moves a first distance in a first direction, the first conductive member and the buffer portion are separated. This embodiment of the application can reduce the risk of the first conductive member interfering with deformation of the buffer portion and the risk of the first conductive member being crushed by the buffer portion when the battery cell assembly expands.

[0018] In one or more of the above optional embodiments, the projection of the first conductive member and the projection of the buffer portion are separated along the second direction; the second direction is perpendicular to the first direction. This reduces the risk of the first conductive member being crushed by the buffer portion when the battery module is subjected to external forces or when the battery cell expands, thereby improving the safety of the battery module.

[0019] In one or more of the above optional embodiments, the connecting portion includes a first connecting portion, and the buffer portion includes a first buffer portion. The first buffer portion includes a first section and a second section, the first section being connected to the base portion and the second section, and the second section connecting the first connecting portion and the first section. The first buffer portion has a bent structure.

[0020] When the battery cell assembly expands, the base applies pressure to the first section, reducing the angle between the first and second sections, thereby moving the base in the first direction and releasing the expansion force of the battery cell assembly. When the battery cell assembly contracts, the angle between the first and second sections increases, causing the base to move in a direction opposite to the first direction, maintaining contact between the base and the battery cell assembly.

[0021] In one or more optional embodiments above, along the second direction, the first connecting portion exceeds the first section, and the first connecting portion exceeds the second section, wherein the second direction is perpendicular to the first direction.

[0022] The embodiment of the present application can reduce the risk of the first section protruding outside the first connecting portion along the second direction and the risk of the second section protruding outside the first connecting portion along the second direction when the first buffer portion is elastically deformed, thereby reducing the possibility of the first section and the second section interfering with other components.

[0023] In one or more of the above optional embodiments, the first segment and the base form a first angle A1, the second segment and the first connecting portion form a second angle B1, and the first segment and the second segment form a third angle C1. When the base is subjected to the expansion force of the battery cell assembly, A1, B1, and C1 can change to elastically deform the first buffer portion and release the expansion force of the battery cell assembly.

[0024] In one or more optional embodiments above, C1 is greater than A1, and C1 is greater than B1. A larger angle is formed between the first section and the second section, which can increase the elastic deformation of the first buffer portion along the first direction.

[0025] In some embodiments, A1 is equal to B1, which is conducive to achieving uniform deformation of the first buffer portion.

[0026] In one or more optional embodiments above, the connecting portion includes a second connecting portion, the buffer portion includes a second buffer portion, the first connecting portion and the second connecting portion are spaced apart along the second direction, and the first buffer portion and the second buffer portion are spaced apart along the second direction.

[0027] In one or more optional embodiments above, the elastic member is an integrally formed structure. Optionally, the elastic member is a sheet metal member.

[0028] In one or more of the above optional embodiments, the first fixing member includes a first portion, and in the first direction, the first portion is located between the second segment and the first connecting portion and is separated from the second segment. This embodiment of the application can reduce the risk of interference between the first portion and the second segment during the elastic deformation of the first buffer portion.

[0029] In one or more of the above optional embodiments, the first portion is configured so that when the battery cell assembly moves a first distance in a first direction, the first portion and the second section are separated. This embodiment of the present application can maintain the first portion and the second section apart during expansion and deformation of the battery cell assembly to reduce the risk of interference between the first portion and the second section.

[0030] In one or more of the above optional embodiments, along the second direction, a portion of the first conductive member is disposed on the first connecting portion, the first connecting portion supports the first conductive member, and the second direction is perpendicular to the first direction. The first connecting portion can support the first conductive member, reducing the effect of gravity on the connection between the first conductive member and the first fixing member, thereby reducing the risk of separation of the first conductive member from the first fixing member.

[0031] In one or more of the above optional embodiments, the housing includes a fixing portion, and the connecting portion is fixed to the fixing portion. Along the first direction, the connecting portion is located between the fixing portion and the battery cell assembly. The fixing portion can limit the elastic member in the first direction to reduce the risk of the elastic member detaching from the housing.

[0032] In one or more optional embodiments above, the housing includes a rear wall, and along the first direction, the battery cell assembly is located between the elastic member and the rear wall, and the stiffness of the elastic member is smaller than the stiffness of the rear wall.

[0033] When the battery module is subjected to external forces, the rear wall and the elastic member can restrain the battery cell assembly from both sides, reducing the movement of the battery cell assembly in the first direction within the housing and improving the stability of the battery cell assembly. When the battery cell assembly expands, the rear wall can limit the expansion of the battery cell assembly toward the rear wall, thereby causing the battery cell assembly to expand toward the elastic member, thereby compressing the elastic member and releasing the expansion force.

[0034] In one or more optional embodiments above, the housing further comprises a bottom wall connected to the rear wall and located at the lower side of the battery cell assembly. The bottom wall can support the battery cell assembly.

[0035] In one or more of the above optional embodiments, the first conductive member is configured to transmit power to the battery cell assembly. When the battery cell assembly is discharging, the electrical energy of the battery cell assembly can be transmitted to a load of the electrical device through the first conductive member to supply power to the load of the electrical device. When the battery cell assembly is charging, external electrical energy can be transmitted to the battery cell assembly through the first conductive member to charge the battery cell assembly.

[0036] In one or more of the above optional embodiments, the first conductive member is configured to transmit electrical signal information of the battery cell assembly. The electrical signal of the battery cell assembly can be transmitted to the circuit board through the first conductive member, and the control unit on the circuit board can control the charging and / or discharging of the battery cell assembly based on the electrical signal of the battery cell assembly.

[0037] In one or more of the above optional embodiments, the battery cell assembly includes a plurality of battery cell units arranged along a first direction. The first conductive member is configured to transmit power of the battery cell assembly, and the first conductive member is connected to the battery cell unit closest to the elastic member.

[0038] The first fixing member is close to the battery cell unit connected to the first conductive member, and can restrain the first conductive member and improve the stability of the connection between the first conductive member and the battery cell unit.

[0039] In one or more of the above optional embodiments, the battery module further includes a sampling member and a second fixing member, the sampling member is configured to transmit electrical signal information of the battery cell assembly, and the sampling member and the elastic member are fixed by the second fixing member, thereby improving the stability of the sampling member in transmitting electrical signal information.

[0040] In one or more optional embodiments above, the second fixing member is fixed to the second connecting portion. The first fixing member fixes the first conductive member to the first connecting portion, and the second fixing member fixes the sampling member to the second connecting portion, thereby separating the first conductive member and the sampling member, thereby reducing interference between high and low voltage signals.

[0041] In one or more of the above optional embodiments, the battery cell unit includes a battery cell and a bracket, wherein the bracket covers at least a portion of the battery cell. The bracket can protect the battery cell and reduce the risk of damage to the battery cell when the battery module is subjected to external force.

[0042] In one or more of the above optional embodiments, the sampling member is fixed to the bracket. The bracket has high strength, and fixing at least part of the sampling member to the bracket can improve the stability of the sampling member.

[0043] In one or more of the above optional embodiments, the battery cell unit is configured such that when the battery cell expands, the bracket moves relative to the shell in a first direction.

[0044] The bracket can move relative to the shell when multiple battery cells expand, and separate the battery cells from the shell, reducing the possibility of friction between the battery cells and the shell, reducing the risk of shell wear and cracking, and improving the safety of the battery cell unit.

[0045] In one or more of the above optional embodiments, the elastic member is configured to provide expansion space for the battery cell assembly. When the battery cell assembly expands, the first conductive member moves with the elastic member, which helps to reduce the force on the first conductive member.

[0046] In a second aspect, an embodiment of the present application provides a battery pack, comprising a front cover and a battery module provided by any of the above embodiments. The housing and the front cover are arranged and connected along a first direction.

[0047] In one or more of the above optional embodiments, the battery pack further includes a circuit board, the circuit board is accommodated in the front cover, and the first conductive member is connected to the circuit board.

[0048] In a third aspect, an embodiment of the present application provides an electrical device comprising at least one battery pack provided by any of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments of the present application.

[0050] FIG1 is a schematic structural diagram of a battery pack provided in some embodiments of the present application;

[0051] FIG2 is a schematic diagram of an explosion of the battery pack shown in FIG1 ;

[0052] FIG3 is a perspective schematic diagram of a battery module provided in some embodiments of the present application;

[0053] FIG4 is a schematic cross-sectional view of a portion of a battery module provided in some embodiments of the present application;

[0054] FIG5 is an enlarged schematic diagram of the frame in FIG4 ;

[0055] FIG6 is a schematic structural diagram of an elastic member of a battery module provided in some embodiments of the present application;

[0056] FIG7 is a schematic diagram of the elastic member shown in FIG6 viewed from a third direction;

[0057] FIG8 is a schematic diagram of assembling an elastic member, a first fixing member, and a second fixing member of a battery module provided in other embodiments of the present application;

[0058] FIG9 is a schematic diagram of the elastic member shown in FIG6 observed along the first direction;

[0059] FIG10 is a schematic diagram of the elastic member shown in FIG6 viewed from a direction opposite to the first direction;

[0060] FIG11 is another schematic diagram of the battery module shown in FIG3 , wherein the housing is omitted;

[0061] FIG12 is another schematic diagram of the battery module shown in FIG11 , wherein the elastic member is omitted;

[0062] FIG13 is a schematic diagram of the assembly of the elastic member, the first conductive member, the second conductive member, the sampling member, the first fixing member, and the second fixing member provided in some embodiments of the present application;

[0063] FIG14 is an enlarged schematic diagram of the circle frame in FIG3;

[0064] FIG15 is a schematic diagram of a front cover, a circuit board, a first conductive member, a second conductive member, and a sampling member provided in some embodiments of the present application;

[0065] FIG16 is a schematic structural diagram of a cell unit of a battery module provided in some embodiments of the present application;

[0066] FIG17 is an enlarged schematic diagram of the circle frame of FIG16;

[0067] FIG18 is a schematic diagram of the battery cell shown in FIG16 ;

[0068] FIG19 is a schematic diagram of the battery cell shown in FIG18 before forming;

[0069] Figure 20 is a schematic diagram of electrical equipment provided in some embodiments of the present application.

[0070] The reference numerals are as follows: DETAILED DESCRIPTION

[0071] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0072] The terms "first," "second," "third," and the like in the specification and claims of this application or the accompanying drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship. In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted.

[0073] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0074] In the description of this application, it should be noted that, unless otherwise specified or limited, the terms "mounted" and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0075] In the embodiments of this application, "parallel" includes not only absolute parallelism but also approximately parallelism as commonly understood in engineering practice. Similarly, "perpendicular" also includes not only absolute perpendicularity but also approximately perpendicularity as commonly understood in engineering practice. For example, if the angle between two directions is 80°-90°, they are considered perpendicular; if the angle between two directions is 0°-10°, they are considered parallel.

[0076] The battery module, battery pack and electrical equipment of the present application are described below with reference to the accompanying drawings.

[0077] For the convenience of description, some electrode terminals are not shown in a bent state in the drawings.

[0078] 1 to 15 , a battery module 100 according to an embodiment of the present application includes a cell assembly 20 . The cell assembly 20 includes a plurality of cell units 20 a . Exemplarily, the plurality of cell units 20 a of the cell assembly 20 are arranged along a first direction X.

[0079] In some embodiments, the battery cell unit 20 a includes a battery cell 21 .

[0080] The battery cell 21 can be a lithium-ion battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell, a magnesium-ion battery cell, or other types of battery cells. The battery cell can be a hard-shell battery cell or a soft-pack battery cell. The battery cell can be a square battery cell, a cylindrical battery cell, or other special-shaped battery cells.

[0081] In some embodiments, the battery cells 21 of the multiple battery cell units 20 a may be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 21 are connected in series and in parallel.

[0082] In some embodiments, the battery module 100 further includes a housing 10 , in which the battery cell assembly 20 is housed.

[0083] The housing 10 may be a square, cylindrical or other shaped housing.

[0084] The housing 10 may be a metal housing, a plastic housing, a metal-plastic composite housing, or a housing made of other materials.

[0085] The housing 10 may be an integrally formed housing, or may be formed by assembling a plurality of independently formed parts.

[0086] In some embodiments, the housing 10 has a first space 10 a , and the battery cell assembly 20 is accommodated in the first space 10 a .

[0087] In some embodiments, the battery module 100 further includes an elastic member 30 . The elastic member 30 is accommodated in the housing 10 . The battery cell assembly 20 and the elastic member 30 are arranged along the first direction X.

[0088] The elastic member 30 may be entirely housed in the housing 10 , or only partially housed in the housing 10 .

[0089] When the battery module 100 is subjected to external force, the elastic member 30 can play a buffering role through elastic deformation, thereby reducing the impact force on the battery cell assembly 20, reducing the risk of failure of the battery cell assembly 20, and improving the reliability and safety of the battery module 100.

[0090] In some embodiments, the battery cell 21 expands during charging, and the elastic member 30 can release the expansion force of the battery cell 21 by deformation, thereby reducing the pressure on the battery cell 21 and improving the charge and discharge performance of the battery cell 21 .

[0091] In some embodiments, the battery module 100 further includes a first conductive member 40 , which is connected to the battery cell assembly 20 .

[0092] Exemplarily, the first conductive member 40 is conductive, and the current and / or electrical signal of the battery cell assembly 20 can be transmitted to the outside through the first conductive member 40 .

[0093] In some embodiments, the battery module 100 further includes a first fixing member 81 , and the first conductive member 40 and the elastic member 30 are fixed by the first fixing member 81 .

[0094] In the embodiment of the present application, the first fixing member 81 can secure the first conductive member 40 to the elastic member 30. When the battery module 100 is subjected to external forces, the first fixing member 81 can limit the first conductive member 40, thereby reducing the movement of the first conductive member 40 and lowering the risk of short circuits. The first conductive member 40 and the first fixing member 81 are fixed to the elastic member 30. The first fixing member 81 can act as a buffer when the battery module 100 is subjected to external forces, reducing the force at the connection between the first conductive member 40 and the first fixing member 81, reducing the risk of cracking or failure of the first conductive member 40, and improving the safety and reliability of the battery module 100.

[0095] In some embodiments, fixing includes but is not limited to abutting, bonding, welding, fastener locking and fixing, snap connection, etc.

[0096] In some embodiments, the first space 10 a has a first opening 10 b at one end along the first direction X, and the first conductive member 40 can extend outside the housing 10 through the first opening 10 b to be connected to other structures.

[0097] In some embodiments, the elastic member 30 is configured to provide expansion space for the battery cell assembly 20. When the battery cell assembly 20 expands, the first conductive member 40 moves with the elastic member 30, which helps to reduce the force on the first conductive member 40.

[0098] In some embodiments, the elastic member 30 is elastic and is configured to provide expansion space when the battery cell 21 expands. When the battery cell 21 expands, the first conductive member 40 moves with the elastic member 30, which helps reduce the force on the first conductive member 40.

[0099] For example, the elastic member 30 may obtain elasticity by adopting an elastic material, an elastic structure or other methods.

[0100] For example, the elastic member can be made of rubber, foam or other elastic materials. Alternatively, the elastic member can also be made of a rigid material, which obtains elasticity by adopting a bending structure, a spiral structure or other structures.

[0101] In some embodiments, the first direction X, the second direction Z, and the third direction Y are perpendicular to each other.

[0102] In some embodiments, the elastic member 30 includes a base 31, a connecting portion 33, and a buffer portion 32. The base 31 is connected to the battery cell assembly 20, the connecting portion 33 is fixed to the housing 10, and the buffer portion 32 connects the base 31 and the connecting portion 33. The first fixing member 81 is fixed to the connecting portion 33.

[0103] In some embodiments, the buffer portion 32 may be a portion of the elastic member 30 that is elastically deformable when subjected to pressure. For example, the buffer portion 32 may be a bent structure or a spiral structure.

[0104] In some embodiments, the base 31 , the connecting portion 33 and the buffer portion 32 may be an integrally formed structure, or may be independently formed components that are connected as a whole by welding, clamping or other means.

[0105] In some embodiments, the connecting portion 33 can be fixed to the housing 10 by abutting, for example, the connecting portion 33 abuts against the housing 10 along the first direction X under the elastic force of the buffer portion 32 to be fixed to the housing 10. Alternatively, the connecting portion 33 can also be fixed to the housing 10 by snapping, fastener connection, welding, or other methods.

[0106] The buffer portion 32 can elastically deform when the cell assembly 20 expands, thereby relieving the expansion force of the cell assembly 20 and improving the charge and discharge performance of the cell assembly 20. Furthermore, during the expansion and contraction of the cell assembly 20, the buffer portion 32 can exert an elastic force on the base portion 31, thereby improving the stability of the contact between the base portion 31 and the cell assembly 20 and reducing the risk of the cell assembly 20 moving within the housing 10. Securing the first fixing member 81 to the connecting portion 33 can improve the stability of the first fixing member 81 and reduce its movement when the battery module 100 is subjected to external forces.

[0107] In some embodiments, the battery cell assembly 2 includes N battery cell units 20 a , and the thickness of the battery cell 21 of each battery cell unit 20 a is D mm.

[0108] For example, the thickness D of the battery cell 21 may be the thickness indicated on a battery cell label, a battery pack label, a battery module label, packaging, a user manual, an instruction manual, an advertisement, a marketing, or other supporting documents.

[0109] In some embodiments, the thickness of the battery cell assembly 20 may be the sum of the thicknesses of the N battery cells 21 , that is, N×D.

[0110] In some embodiments, the elastic member 30 is configured such that when the battery cell assembly 20 moves a first distance along the first direction X, the buffer portion 32 and the first fixing member 81 are separated. The first distance is W, where W is less than or equal to N×D×0.15.

[0111] For example, when the battery cell assembly 20 moves a first distance W along the first direction X, the base 31 may move the first distance W under the push of the battery cell assembly 20 .

[0112] Separation means that two parts are separated from each other and there is a gap between them.

[0113] In the embodiment of the present application, when the battery cell assembly 20 expands, the buffer portion 32 and the first fixing member 81 can be separated, thereby reducing the risk of interference between the first fixing member 81 and the buffer portion 32 .

[0114] In some embodiments, W is less than or equal to N×D×0.10, so as to limit the expansion and deformation of the battery cell assembly 20 to a smaller range and improve the charge and discharge performance of the battery cell assembly 20 .

[0115] In some embodiments, W is greater than or equal to N×D×0.05, which can provide space for the expansion and deformation of the battery cell assembly 20 and reduce the expansion force.

[0116] In some embodiments, W may be N×D×0.05, N×D×0.06, N×D×0.07, N×D×0.08, N×D×0.09, N×D×0.1, N×D×0.11, N×D×0.12, N×D×0.13, N×D×0.14, or N×D×0.15.

[0117] In some embodiments, W is greater than or equal to N×D×0.05, and W is less than or equal to N×D×0.15. Alternatively, W is greater than or equal to N×D×0.05, and W is less than or equal to N×D×0.10.

[0118] In some embodiments, a portion of the first conductive member 40 is fixed to a first side of the connecting portion 33 by a first fixing member 81, the first side being the side away from the buffer portion 32. This embodiment of the present application can reduce the risk of interference between the first conductive member 40 and the buffer portion 32.

[0119] In some embodiments, the first fixing member 81 includes a cable tie. The connecting portion 33 is provided with a first through hole 330 a . The first fixing member 81 passes through the first through hole 330 a . Part of the first conductive member 40 is fixed to the first side of the connecting portion 33 through the first fixing member 81 .

[0120] The first fixing member 81 may be tied to the first conductive member 40 to fix a portion of the first conductive member 40 to the first side of the connecting portion 33 .

[0121] In some embodiments, the first fixing member 81 can be located on a first side of the connecting portion 33 to reduce the risk of interference between the first fixing member 81 and the buffer portion 32. In some embodiments, the first conductive member 40 is configured so that when the battery cell assembly 20 moves a first distance along the first direction X, the first conductive member 40 and the buffer portion 32 separate. This embodiment of the present application can reduce the risk of the first conductive member 40 interfering with the deformation of the buffer portion 32 and the risk of the first conductive member 40 being crushed by the buffer portion 32 when the battery cell assembly 20 expands.

[0122] In some embodiments, the projection of the first conductive member 40 is separated from the projection of the buffer portion 32 along the second direction Z. This reduces the risk of the first conductive member 40 being crushed by the buffer portion 32 when the battery module 100 is subjected to external forces or when the battery cell 21 expands, thereby improving the safety of the battery module 100.

[0123] In some embodiments, the connecting portion 33 includes a first connecting portion 33 a , and the buffering portion 32 includes a first buffering portion 321 .

[0124] In some embodiments, the first buffer portion 321 has a bent structure. For example, the first buffer portion 321 can be bent once or multiple times.

[0125] In some embodiments, the first buffer portion 321 includes a first section 321 a connected to the base portion 31 and a second section 321 b , wherein the first section 321 a is connected to the base portion 31 and the second section 321 b is connected to the first connection portion 33 a and the first section 321 a .

[0126] Illustratively, after the battery module 100 is assembled, the first buffer portion 321 is in a compressed state, exerting elastic force on the base 31 and the first connecting portion 33 a so that the base 31 abuts against the battery cell assembly 20 and the first connecting portion 33 a abuts against the shell 10 .

[0127] When the battery cell assembly 20 expands, the base 31 applies pressure to the first section 321a, and the angle between the first section 321a and the second section 321b decreases, thereby moving the base 31 in the first direction X and releasing the expansion force of the battery cell assembly 20. When the battery cell assembly 20 contracts, the angle between the first section 321a and the second section 321b increases, causing the base 31 to move in a direction opposite to the first direction X, maintaining contact between the base 31 and the battery cell assembly 20.

[0128] In some embodiments, the first through hole 330a is disposed in the first connecting portion 33a.

[0129] In some embodiments, along the second direction Z, the first connecting portion 33 a extends beyond the first segment 321 a , and the first connecting portion 33 a extends beyond the second segment 321 b .

[0130] The embodiment of the present application can reduce the risk of the first section 321a protruding outside the first connection portion 33a along the second direction Z and the risk of the second section 321b protruding outside the first connection portion 33a along the second direction Z when the first buffer portion 321 is elastically deformed, thereby reducing the possibility of the first section 321a and the second section 321b interfering with other components.

[0131] In some embodiments, in the first direction X, a first connection point P1 between the first segment 321 a and the second segment 321 b is located between the base portion 31 and the first connection portion 33 a .

[0132] When the angle between the first section 321a and the second section 321b changes, the first connection point P1 can move. Disposing the first connection point P1 between the base 31 and the first connection portion 33a allows the first connection point P1 to move between the base 31 and the first connection portion 33a, thereby reducing the risk of interference between the first connection point P1 and other components.

[0133] In some embodiments, the first segment 321a and the base 31 form a first angle A1, the second segment 321b and the first connecting portion 33a form a second angle B1, and the first segment 321a and the second segment 321b form a third angle C1.

[0134] When the base portion 31 is subjected to the expansion force of the battery cell assembly 2 , A1 , B1 , and C1 may change to elastically deform the first buffer portion 321 and release the expansion force of the battery cell assembly 2 .

[0135] In some embodiments, C1 is greater than A1, and C1 is greater than B1. A larger angle is formed between the first section 321a and the second section 321b, which can increase the elastic deformation of the first buffer portion 321 along the first direction X.

[0136] In some embodiments, A1 is equal to B1, which is beneficial to achieving uniform deformation of the first buffer portion 321 .

[0137] In some embodiments, C1 may be 70°, 90°, 120°, or 150°.

[0138] In some embodiments, the base portion 31 , the first connecting portion 33 a and the first buffer portion 321 form an “M”-shaped structure.

[0139] 10 , the first connection portion 33 a extends beyond the base 31 in the third direction Y when viewed from a direction X′ opposite to the first direction X. The first conductive member 40 extends from one side of the base 31 in the third direction Y.

[0140] The first connecting portion 33a extends beyond the base 31 in the third direction Y, thereby increasing the contact area between the first connecting portion 33a and the housing 10 and improving the stability of the elastic member 30. Correspondingly, space can be reserved on the side of the base 31 along the third direction Y to facilitate the extraction of the first conductive member 40.

[0141] 10 , when viewed in a direction X′ opposite to the first direction X, one end of the first connection portion 33 a extends beyond the base 31 in the third direction Y, and the other end of the first connection portion 33 a extends beyond the base 31 in the opposite direction of the third direction Y.

[0142] In some embodiments, the connecting portion 33 includes a second connecting portion 33b, and the buffer portion 32 includes a second buffer portion 322. The first connecting portion 33a and the second connecting portion 33b are spaced apart along the second direction Z, and the first buffer portion 321 and the second buffer portion 322 are spaced apart along the second direction Z.

[0143] In some embodiments, the first buffer portion 321 and the second buffer portion 322 may respectively apply elastic forces to both ends of the base portion 31 along the second direction Z, thereby improving the uniformity of the force applied to the base portion 31 .

[0144] In some embodiments, the second buffer portion 322 has a bent structure. For example, the second buffer portion 322 can be bent once or multiple times.

[0145] In some embodiments, the second buffer portion 322 includes a third section 322a and a fourth section 322b. The third section 322a is connected to the base portion 31 and the fourth section 322b. The fourth section 322b connects the second connection portion 33b and the third section 322a.

[0146] In some embodiments, along the opposite direction of the second direction Z, the second connecting portion 33 b extends beyond the third section 322 a , and the second connecting portion 33 b extends beyond the fourth section 322 b .

[0147] In some embodiments, in the first direction X, the second connection point P2 of the third segment 322 a and the fourth segment 322 b is located between the base portion 31 and the second connection portion 33 b.

[0148] In some embodiments, the third segment 322a and the base 31 form a first angle A2, the fourth segment 322b and the second connecting portion 33b form a second angle B2, and the third segment 322a and the fourth segment 322b form a third angle C2.

[0149] When the base portion 31 is subjected to the expansion force of the battery cell assembly 2 , A2 , B2 , and C2 may change to elastically deform the second buffer portion 322 and release the expansion force of the battery cell assembly 2 .

[0150] In some embodiments, C1 = C2.

[0151] In some embodiments, A1=B1=A2=B2.

[0152] In some embodiments, the second connecting portion 33 b extends beyond the base portion 31 in a third direction Y as viewed along a direction X′ opposite to the first direction X.

[0153] In some embodiments, the connecting portion 33 further includes two flanges 33c. One flange 33c is connected to the end of the first connecting portion 33a along the second direction Z and is folded inwardly of the first connecting portion 33a. The other flange 33c is connected to the end of the second connecting portion 33b along the opposite direction of the second direction Z and is folded inwardly of the second connecting portion 33b. The provision of the flanges 33c increases the overall strength of the connecting portion 33 and enhances protection of the first conductive member 40.

[0154] In some embodiments, the elastic member 30 is an integrally formed structure.

[0155] In some embodiments, the elastic member 30 is a sheet metal member.

[0156] In some embodiments, the first fixing member 81 includes a first portion 811 . In the first direction X, the first portion 811 is located between the second section 321 b and the first connecting portion 33 a and is separated from the second section 321 b .

[0157] The embodiment of the present application can reduce the risk of interference between the first portion 811 and the second section 321 b during the elastic deformation of the first buffer portion 321 .

[0158] In some embodiments, the first portion 811 is configured such that when the battery cell assembly 20 moves a first distance W along the first direction X, the first portion 811 and the second section 321 b are separated.

[0159] In the embodiment of the present application, the first portion 811 and the second section 321 b can be kept apart during the expansion and deformation of the battery cell assembly 20 , thereby reducing the risk of interference between the first portion 811 and the second section 321 b .

[0160] In some embodiments, along the second direction Z, a portion of the first conductive member 40 is disposed on the first connecting portion 33a, and the first connecting portion 33a supports the first conductive member 40. The first connecting portion 33a can support the first conductive member 40, reduce the gravity acting on the fixing point between the first conductive member 40 and the first fixing member 81, and reduce the risk of separation of the first conductive member 40 from the first fixing member 81.

[0161] In some embodiments, the housing 10 includes a rear wall 15. Along the first direction X, the battery cell assembly 20 is located between the elastic member 30 and the rear wall 15. The elastic member 30 has a lower stiffness than the rear wall 15. When the battery cell 21 expands, the elastic member 30 deforms, providing expansion space for the battery cell 21.

[0162] Illustratively, the rear wall 15 and the elastic member 30 clamp the battery cell assembly 20 from both sides in the first direction X. The rear wall 15 and the elastic member 30 may directly clamp the battery cell assembly 20 or indirectly clamp the battery cell assembly 20 through other components. For example, a buffer pad may be provided between the rear wall 15 and the battery cell assembly 20.

[0163] When the battery module 100 is subjected to external force, the rear wall 15 and the elastic member 30 can limit the battery cell assembly 20 from both sides, reduce the movement of the battery cell assembly 20 in the housing 10 along the first direction X, and improve the stability of the battery cell assembly 20.

[0164] When the battery cell assembly 20 expands, the rear wall 15 can limit the expansion of the battery cell assembly 20 toward the rear wall 15, so that the battery cell assembly 20 is more inclined to expand toward the elastic member 30, thereby compressing the elastic member 30 to release the expansion force.

[0165] In some embodiments, the housing 10 further includes a bottom wall 13 , which is connected to the rear wall 15 and is located at a lower side of the battery cell assembly 20 . The bottom wall 13 can support the battery cell assembly 20 .

[0166] In some embodiments, the housing 10 includes a fixing portion 10 c, and the connecting portion 33 is fixed to the fixing portion 10 c. Along the first direction X, the connecting portion 33 is located between the fixing portion 10 c and the battery cell assembly 20.

[0167] The fixing portion 10 c can limit the elastic member 30 in the first direction X to reduce the risk of the elastic member 30 being separated from the housing 10 .

[0168] In some embodiments, the fixing portion 10c includes a first fixing portion 10c1, which is disposed at an end of the bottom wall 13 away from the rear wall 15 along the first direction X. The connecting portion 33 is fixed to the first fixing portion 10c1. Along the first direction X, at least a portion of the elastic member 30 is located between the first fixing portion 10c1 and the battery cell assembly 20.

[0169] The bottom wall 13 may have one first fixing portion 10c1 or multiple first fixing portions 10c1. For example, the bottom wall 13 has multiple first fixing portions 10c1 arranged along the third direction Y. For example, there may be two first fixing portions 10c1.

[0170] The first fixing portion 10 c 1 can limit the elastic member 30 in the first direction X to reduce the risk of the elastic member 30 being separated from the housing 10 .

[0171] In some embodiments, the first connecting portion 33a and the first fixing portion 10c1 are arranged along the first direction X and fixed to the first fixing portion 10c1. Optionally, the first connecting portion 33a abuts against the first fixing portion 10c1.

[0172] In some embodiments, the housing 10 further includes a first side wall 11 and a second side wall 12 . Along the third direction Y, the first side wall 11 and the second side wall 12 are respectively located on two sides of the battery cell assembly 20 .

[0173] In some embodiments, the housing 10 further includes a top wall 14 . Along the second direction Z, the bottom wall 13 and the top wall 14 are respectively located on two sides of the battery cell assembly 20 .

[0174] In some embodiments, the first side wall 11 is connected to the bottom wall 13 , the top wall 14 , and the rear wall 15 , and the second side wall 12 is connected to the bottom wall 13 , the top wall 14 , and the rear wall 15 .

[0175] The first side wall 11 , the second side wall 12 , the bottom wall 13 , the top wall 14 and the rear wall 15 together define a first space 10 a .

[0176] In some embodiments, the fixing portion 10c includes a second fixing portion 10c2, which is disposed at one end of the first side wall 11 along the first direction X. The first connecting portion 33a and the second connecting portion 33b are fixed to the second fixing portion 10c2. Optionally, the first connecting portion 33a abuts against the second fixing portion 10c2.

[0177] In some embodiments, the second connecting portion 33b is fixed to the second fixing portion 10c2. Optionally, the second connecting portion 33b abuts against the second fixing portion 10c2.

[0178] In some embodiments, the fixing portion 10c includes a third fixing portion 10c3, which is disposed at one end of the second side wall 12 along the first direction X. The first connecting portion 33a and the second connecting portion 33b are fixed to the third fixing portion 10c3. Optionally, the first connecting portion 33a abuts against the third fixing portion 10c3.

[0179] In some embodiments, the second connecting portion 33b is fixed to the third fixing portion 10c3. Optionally, the second connecting portion 33b abuts against the third fixing portion 10c3.

[0180] In some embodiments, the length of the first fixing portion 10c1 is less than the length of the first connecting portion 33a in the second direction Z. The moment arm of the first fixing portion 10c1 is less than the moment arm of the first connecting portion 33a. When the first fixing portion 10c1 and the first connecting portion 33a are pressed against each other, the moment applied to the first fixing portion 10c1 is smaller, thereby reducing the risk of the first fixing portion 10c1 being deformed and folded outward when pressed by the first connecting portion 33a. This maintains the elastic member 30 within the housing 10 and improves the stability of the battery module 100.

[0181] In some embodiments, the fixing portion 10c includes a fourth fixing portion 10c4, which is arranged at one end of the top wall 14 away from the rear wall 15 along the first direction X. Along the first direction X, at least a portion of the elastic member 30 is located between the fourth fixing portion 10c4 and the battery cell assembly 20.

[0182] In some embodiments, the second connecting portion 33b and the fourth fixing portion 10c4 are arranged along the first direction X and fixed to the fourth fixing portion 10c4. Optionally, the second connecting portion 33b abuts against the fourth fixing portion 10c4.

[0183] In some embodiments, in the second direction Z, the length of the fourth fixing portion 10c4 is less than the length of the second connecting portion 33b.

[0184] In some embodiments, the thickness of the first fixing portion 10c1 is greater than the thickness of the first connecting portion 33a. The first fixing portion 10c1 has greater strength than the first connecting portion 33a. When squeezed by the first connecting portion 33a, the first fixing portion 10c1 is less likely to fold outward and deform, thereby retaining the elastic member 30 within the housing 10 and improving the stability of the battery module 100.

[0185] In some embodiments, the thickness of the fourth fixing portion 10c4 is greater than the thickness of the second connecting portion 33b.

[0186] In some embodiments, the first conductive member 40 is configured to transmit power of the battery cell assembly 20 .

[0187] When the battery cell assembly 20 is discharging, the electric energy of the battery cell assembly 20 can be transmitted to the load of the electrical equipment 300 through the first conductive member 40 to supply power to the load of the electrical equipment 300. When the battery cell assembly 20 is charging, external electric energy can be transmitted to the battery cell assembly 20 through the first conductive member 40 to charge the battery cell assembly 20.

[0188] In some embodiments, the first conductive member 40 is configured to transmit electrical signal information of the battery cell assembly 20, such as a voltage signal, a current signal, a temperature signal, etc. The electrical signal of the battery cell assembly 20 can be transmitted to the circuit board 60 through the first conductive member 40, and a control unit (e.g., a microcontroller) on the circuit board 60 can control the charging and / or discharging of the battery cell assembly 20 based on the electrical signal of the battery cell assembly 20.

[0189] In some embodiments, the first conductive member 40 is configured to transmit power and electrical signal information of the battery cell assembly 20 .

[0190] In some embodiments, the battery cell assembly 20 includes a plurality of battery cell units 20 a arranged along a first direction X. The first conductive member 40 is configured to transmit power of the battery cell assembly 2 , and the first conductive member 40 is connected to the battery cell unit 20 a closest to the elastic member 30 .

[0191] The first fixing member 81 is close to the battery cell unit 20 a connected to the first conductive member 40 , and can restrain the first conductive member 40 , thereby improving the stability of the connection between the first conductive member 40 and the battery cell unit 20 a .

[0192] In some embodiments, the first conductive member 40 comprises a flexible wiring harness. When the multiple battery cells 20 a expand, the battery cell 20 a closest to the elastic member 30 compresses the elastic member 30 and moves in the first direction X. By deforming, the flexible wiring harness reduces the force acting on the connection between the first conductive member 40 and the battery cell 20 a, thereby lowering the risk of failure in the connection between the first conductive member 40 and the battery cell 20 a.

[0193] In some embodiments, the bottom wall 13 is configured to support the battery cell assembly 20 , and the elastic member 30 is connected to the bottom wall 13 .

[0194] Exemplarily, the elastic member 30 is movably connected to the bottom wall 13 along the first direction X.

[0195] Exemplarily, the elastic member 30 is in contact with the bottom wall 13 .

[0196] When the battery cell assembly 20 expands, the bottom wall 13 can guide the elastic member 30 to deform elastically.

[0197] In some embodiments, the battery module 100 further includes a second conductive member 50 , which is connected to the battery cell unit 20 a farthest from the elastic member 30 and is configured to transmit power of the battery cell assembly 20 .

[0198] Exemplarily, one of the first conductive member 40 and the second conductive member 50 is connected to the common positive electrode of the battery cell assembly 20 , and the other is connected to the common negative electrode of the battery cell assembly 20 .

[0199] The battery cell assembly 20 can realize power input and output through the first conductive member 40 and the second conductive member 50 .

[0200] In some embodiments, the second conductive member 50 comprises a flexible wire harness.

[0201] In some embodiments, the first conductive member 40 and the second conductive member 50 are respectively extended from both sides of the base 31 along the third direction Y.

[0202] In some embodiments, the battery module 100 further includes a sampling component 70 , which is configured to transmit electrical signal information of the battery cell assembly 20 .

[0203] In some embodiments, the battery module 100 further includes a second fixing member 82 , and the sampling member 70 and the elastic member 30 are fixed by the second fixing member 82 , thereby improving the stability of the sampling member 70 in transmitting electrical signal information.

[0204] There may be one or more second fixing members 82 .

[0205] In some embodiments, the second fixing member 82 is fixed to the second connecting portion 33 b. For example, the connection between the second fixing member 82 and the sampling member 70 is located on a side of the second connecting portion 33 b away from the second buffer portion 322.

[0206] In some embodiments, the first fixing member 81 fixes the first conductive member 40 to the first connecting portion 33a, and the second fixing member 82 fixes the sampling member 70 to the second connecting portion 33b, so that the first conductive member 40 and the sampling member 70 are separated and the interference between high and low voltage signals is reduced.

[0207] In some embodiments, at least one of the first fixing member 81 and the second fixing member 82 is a buckle member.

[0208] In some embodiments, a portion of the sampling member 70 is fixed to one side of the second connecting portion 33 b along the first direction X by a second fixing member 82 .

[0209] In some embodiments, the second fixing member 82 includes a cable tie, and a second through hole 330b is provided on the second connecting portion 33b. The second fixing member 82 passes through the second through hole 330b. Part of the sampling member 70 is fixed to one side of the second connecting portion 33b along the first direction X through the second fixing member 82.

[0210] In some embodiments, the second fixing member 82 further includes a second portion 821 . In the first direction X, the second portion 821 is located between the fourth section 322 b and the second connecting portion 33 b and is separated from the fourth section 322 b .

[0211] In some embodiments, the second fixing member 82 may be located on the first side of the connecting portion 33 to reduce the risk of interference between the second fixing member 82 and the buffer portion 32 .

[0212] 1 to 19 , in some embodiments, the battery cell unit 20 a further includes a bracket 22 , and the bracket 22 covers at least a portion of the battery cell 21 .

[0213] The bracket 22 can protect the battery cell 21 and reduce the risk of damage to the battery cell 21 when the battery module 100 is subjected to external force.

[0214] In some embodiments, the bracket 22 is integrally formed with the battery cell 21, which can enhance the connection strength between the bracket 22 and the battery cell 21. Integral formation refers to direct fixation of the bracket 22 and the battery cell 21. Integral formation methods include, but are not limited to, potting and injection molding.

[0215] In some embodiments, after the insulating material is placed around the battery cell 21 through a pouring process, the insulating material is solidified to form a bracket 22, and the bracket 22 and the battery cell 21 are bonded and fixed. For example, the battery cell 21 is placed in a mold, and the insulating material is poured into the mold. After the insulating material is solidified to form the bracket 22 and is bonded and fixed to the battery cell 21, the bracket 22 and the battery cell 21 are taken out of the mold.

[0216] In some embodiments, the insulating material includes but is not limited to potting compound and foaming compound.

[0217] In some embodiments, the injection molding process includes placing the battery cell 21 into a mold, heating and melting the insulating material with an injection molding machine, allowing the melted insulating material to flow into the mold, and solidifying the insulating material to form the bracket 22, which is bonded and fixed to the battery cell 21. The bracket 22 and battery cell 21 are then removed from the mold. Optionally, the insulating material includes polyamide.

[0218] In some embodiments, the bracket 22 is an insulating bracket, which can reduce the risk of short circuit between the bracket 22 and the battery cell 21 .

[0219] In some embodiments, the sampling member 70 is fixed to the bracket 22. The bracket 22 has high strength, and fixing at least a portion of the sampling member 70 to the bracket 22 can improve the stability of the sampling member 70.

[0220] In some embodiments, the battery cell 21 includes a battery cell shell 21a, an electrode assembly 21b and an electrode terminal 21c. The electrode assembly 21b is accommodated in the battery cell shell 21a, the electrode terminal 21c is connected to the electrode assembly 21b and is led out from the battery cell shell 21a, the bracket 22 is fixed to the battery cell shell 21a, and the electrode terminal 21c extends from the bracket 22.

[0221] The electrode assembly 21b includes a positive electrode sheet, a negative electrode sheet and a separator. The battery cell 21 mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work.

[0222] One end of electrode terminal 21c extends outside of cell casing 21a and is used to electrically connect to an external circuit. The other end of electrode terminal 21c extends into cell casing 21a and is used to electrically connect to electrode assembly 21b. Electrode terminal 21c is used to electrically connect electrode assembly 21b to an external circuit to enable charging and discharging of battery cell 21.

[0223] When the battery module 100 is subjected to external force, the bracket 22 can fix the electrode terminal 21 c to reduce the force between the electrode terminal 21 c and the cell casing 21 a and reduce the risk of sealing failure of the cell casing 21 a.

[0224] In some embodiments, the battery cell 21 includes two electrode terminals 21c, one for electrically connecting to the positive electrode tab and the other for electrically connecting to the negative electrode tab. The two electrode terminals 21c can be extended from the same end of the battery cell casing 21a or from opposite ends of the battery cell casing 21a.

[0225] In some embodiments, the two electrode terminals 21 c are respectively led out from both ends of the cell casing 21 a along the third direction Y. The cell 21 may include two brackets 22 , which are respectively fixed to both ends of the cell casing 21 a along the third direction Y; the two electrode terminals 21 c respectively pass through the two brackets 22 .

[0226] In some embodiments, the first conductive member 40 may be connected to the electrode terminal 21 c of the battery cell 21 closest to the elastic member 30 .

[0227] In some embodiments, the second conductive member 50 may be connected to the electrode terminal 21 c of the battery cell 21 farthest from the elastic member 30 .

[0228] In some embodiments, the cell housing 21 a is made of aluminum-plastic film or steel-plastic film.

[0229] In some embodiments, the cell case 21 a includes a main body 211 and a sealing portion 212 . The electrode assembly 21 b is accommodated in the main body 211 , and the electrode terminal 21 c extends out of the cell case 21 a from the sealing portion 212 .

[0230] In some embodiments, the sealing portion 212 includes two first sealing portions 212a and two second sealing portions 212b. The two first sealing portions 212a are respectively located on both sides of the main body 211 along the third direction Y, and the two second sealing portions 212b are respectively located on both sides of the main body 211 along the second direction Z.

[0231] In some embodiments, the bracket 22 includes a first bracket 221 , and the first bracket 221 covers at least a portion of a first sealing portion 212 a and at least a portion of the main body 211 .

[0232] In some embodiments, the bracket 22 includes a second bracket 222 , and the second bracket 222 covers at least a portion of the other first sealing portion 212 a and at least a portion of the main body 211 .

[0233] When the battery module 100 is subjected to external force, the bracket 22 can protect the first sealing portion 212a and the second sealing portion 212b of the battery cell housing 21a, thereby reducing the risk of sealing failure and improving safety.

[0234] In some embodiments, the battery cell housing 21a includes a first housing 2111 and a second housing 2112. The first housing 2111 is connected to the second housing 2112. The first housing 2111 and the second housing 2112 can be folded along the connection point so that the first housing 2111 and the second housing 2112 overlap, thereby covering the electrode assembly 21b. In other embodiments, the first housing 2111 and the second housing 2112 can be two separate independent components.

[0235] In some embodiments, the first shell 2111 is provided with a first recess 2111 a , and the second shell 2112 is provided with a second recess 2112 a . The first recess 2111 a and the second recess 2112 a form an accommodating space for accommodating the electrode assembly 21 b .

[0236] In some embodiments, the first shell 2111 is provided with a first extension edge 2113 surrounding the first recess 2111a, and the second shell 2112 is provided with a second extension edge 2114 surrounding the second recess 2112a. The first extension edge 2113 and the second extension edge 2114 overlap and are sealed to form a sealing portion 212.

[0237] In some embodiments, the battery cell unit 20 a is configured such that when the battery cell 21 expands, the bracket 22 moves relative to the housing 10 in the first direction X.

[0238] The bracket 22 can move relative to the shell 10 when the multiple battery cells 21 expand, and separate the battery cells 21 from the shell 10, reducing the possibility of friction between the battery cells 21 and the shell 10, reducing the risk of wear and cracking of the shell 10, and improving the safety of the battery cell unit 20a.

[0239] In some embodiments, a first insulating sheet 110 is provided on the surface of the bottom wall 13 facing the battery cell assembly 20, and the battery cell unit 20a is connected to the first insulating sheet 110. The battery cell unit 20a is configured such that when the battery cell 21 expands, the bracket 22 moves along the first direction X on the first insulating sheet 110.

[0240] The first insulating sheet 110 can separate the bottom wall 13 from the battery cell unit 20 a , thereby preventing the bracket 22 from directly rubbing against the bottom wall 13 , reducing the possibility of generating metal particles, and lowering the risk of short circuit.

[0241] In some embodiments, the bracket 22 is in contact with and connected to the first insulating sheet 110 .

[0242] In some embodiments, the bracket 22 has a contact surface 22a facing the first insulating sheet 110. The contact surface 22a is closer to the first insulating sheet 110 than the battery cell 21 in the direction opposite to the second direction Z. The contact surface 22a contacts the first insulating sheet 110, and when the battery cell 21 expands, the contact surface 22a can move on the first insulating sheet 110.

[0243] The embodiment of the present application further provides a battery pack 200 , which includes at least one battery module 100 provided in any of the aforementioned embodiments.

[0244] In some embodiments, the battery pack 200 further includes a front cover 16 , and the housing 10 and the front cover 16 are arranged and connected along the first direction X.

[0245] Illustratively, the front cover 16 is used to cover the first opening 10 b of the housing 10 .

[0246] In some embodiments, the housing 10 can be fixed to the front cover 16 by snapping, welding, fastener connection or other methods.

[0247] In some embodiments, the front cover 16 may be fixed to the housing 10 by fasteners, such as bolts.

[0248] In some embodiments, the battery pack 200 further includes a circuit board 60 . The circuit board 60 is housed in the front cover 16 , and the first conductive member 40 is connected to the circuit board 60 .

[0249] Exemplarily, a second space 161 is provided on a side of the front cover 16 facing the housing 10 , and the circuit board 60 is accommodated in the second space 161 and connected to the front cover 1 .

[0250] In some examples, the circuit board 60 includes a printed circuit board (PCB). Alternatively, the circuit board 60 includes a flexible printed circuit (FPC).

[0251] In some embodiments, the circuit board 60 includes a BMS component (Battery Management System).

[0252] The first conductive member 40 can transmit power or electrical signal information through the circuit board 60 .

[0253] In some embodiments, the second conductive member 50 is connected to the circuit board 60 .

[0254] In some embodiments, the battery pack 200 includes a first connection terminal 200a and a second connection terminal 200b configured to connect to an external device. The first connection terminal 200a is connected to the first conductive member 40 , and the second connection terminal 200b is connected to the second conductive member 50 .

[0255] In some embodiments, the second conductive member 50 is directly connected to the second connection end 200 b , and the second conductive member 50 and the elastic member 30 are separated, thereby reducing the influence of the elastic member 30 on the second conductive member 50 .

[0256] In some embodiments, the sampling member 70 is connected to the circuit board 60 .

[0257] 20 , the present application further provides an electric device 300, which includes at least one battery pack 200 provided by any of the aforementioned embodiments. The battery pack 200 can provide electrical energy for the operation of the electric device.

[0258] The electrical device 300 in the embodiment of the present application may be a portable device, a laptop computer, an electric toy, a drone, a power tool, an energy storage system, etc. Power tools include metal cutting power tools and cleaning tools, such as electric drills, electric wrenches, vacuum cleaners, and robot vacuums. The embodiment of the present application does not impose any particular restrictions on the above-mentioned electrical devices.

[0259] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions within the scope of the claims.

Claims

1. A battery module, comprising: a housing; a battery cell assembly including a plurality of battery cell units, accommodated in the housing; an elastic member, accommodated in the housing, the battery cell assembly and the elastic member being arranged in a first direction; a first conductive member, connected to the battery cell assembly; a first fixing member, the first conductive member and the elastic member being fixed by the first fixing member.

2. The battery module according to claim 1, wherein, the elastic member includes a base portion, a connecting portion and a buffer portion, the base portion is connected to the battery cell assembly, the connecting portion is fixed to the housing, and the buffer portion connects the base portion and the connecting portion; the first fixing member is fixed to the connecting portion.

3. The battery module according to claim 2, wherein, the battery cell assembly includes N battery cell units, each battery cell unit includes a battery cell, and the thickness of each battery cell is D mm. The elastic member is configured such that when the battery cell assembly moves a first distance in the first direction, the buffer portion and the first fixing member are separated from each other; the first distance is W, W is greater than or equal to N×D×0.05, and W is less than or equal to N×D×0.15; or W is greater than or equal to N×D×0.05, and W is less than or equal to N×D×0.

10.

4. The battery module according to claim 2 or 3, wherein, a part of the first conductive member is fixed to a first side of the connecting portion by the first fixing member, and the first side is the side away from the buffer portion.

5. The battery module according to claim 4, wherein, the first fixing member includes a cable tie, a first through hole is provided on the connecting portion, the first fixing member passes through the first through hole, and a part of the first conductive member is fixed to the first side of the connecting portion by the first fixing member.

6. The battery module according to any one of claims 3 - 5, wherein, the first conductive member is configured such that when the battery cell assembly moves the first distance in the first direction, the first conductive member and the buffer portion are separated from each other.

7. The battery module according to any one of claims 2 - 6, wherein, in a second direction, the projection of the first conductive member and the projection of the buffer portion are separated from each other; wherein the second direction is perpendicular to the first direction.

8. The battery module according to any one of claims 3 - 7, wherein, the connecting portion includes a first connecting portion, and the buffer portion includes a first buffer portion; the first buffer portion includes a first section and a second section, the first section is connected to the base portion and the second section, and the second section connects the first connecting portion and the first section; wherein the first buffer portion has a bent structure.

9. The battery module according to claim 8, wherein, in a second direction, the first connecting portion extends beyond the first section and the second section, wherein the second direction is perpendicular to the first direction.

10. The battery module according to claim 8 or 9, wherein, the first section and the base portion form a first angle, the second section and the first connecting portion form a second angle, and the first section and the second section form a third angle.

11. The battery module according to any one of claims 8-10, wherein, the first fixing member includes a first part, in the first direction, the first part is located between the second section and the first connecting portion, and is spaced apart from the second section.

12. The battery module according to claim 11, wherein, the first part is configured such that when the battery cell assembly moves the first distance in the first direction, the first part is spaced apart from the second section.

13. The battery module according to claim 8, wherein, along a second direction, a part of the first conductive member is disposed on the first connecting portion, the first connecting portion bears the first conductive member, and the second direction is perpendicular to the first direction.

14. The battery module according to any one of claims 2-13, wherein, the housing includes a fixing portion, along the first direction, the connecting portion is located between the fixing portion and the battery cell assembly, and the connecting portion is fixed to the fixing portion.

15. The battery module according to any one of claims 1-14, wherein, the housing includes a rear wall, along the first direction, the battery cell assembly is located between the elastic member and the rear wall, and the stiffness of the elastic member is less than the stiffness of the rear wall.

16. The battery module according to any one of claims 1-15, wherein, the first conductive member is configured to transmit the power of the battery cell assembly, and / or, the first conductive member is configured to transmit the electrical signal information of the battery cell assembly.

17. The battery module according to claim 16, wherein, the battery cell assembly includes a plurality of battery cell units arranged along the first direction; the first conductive member is configured to transmit the power of the battery cell assembly, and the first conductive member is connected to the battery cell unit closest to the elastic member.

18. The battery module according to claim 1, wherein, the battery module further includes a sampling member and a second fixing member, the sampling member is configured to transmit the electrical signal information of the battery cell assembly, and the sampling member and the elastic member are fixed by the second fixing member.

19. The battery module according to claim 18, wherein, the battery cell unit includes a battery cell and a bracket, and the bracket covers at least a part of the battery cell; the sampling member is fixed to the bracket.

20. The battery module according to claim 19, wherein, the battery cell unit is configured such that when the battery cell expands, the bracket moves relative to the housing in the first direction.

21. The battery module according to any one of claims 1-20, wherein, the elastic member is configured to provide an expansion space for the battery cell assembly.

22. A battery pack, comprising: the battery module according to any one of claims 1-21; a front cover, the housing and the front cover are arranged and connected along the first direction.

23. The battery pack according to claim 22, further comprising a circuit board, the circuit board is received in the front cover, and the first conductive member is connected to the circuit board.

24. An electrical device, comprising at least one battery pack according to claim 22 or 23.

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