Battery module, battery pack and electric equipment

Abstract

The invention provides a battery module, a battery pack and electric equipment, the battery module comprises a shell, a battery cell assembly and a temperature detection piece, the shell is provided with a first space, the battery cell assembly is arranged in the first space, the battery cell assembly comprises a plurality of battery cell units, each battery cell unit comprises a support, the battery cell comprises a battery cell shell, and the temperature detection piece is arranged in the battery cell shell. The support covers at least part of the battery cell shell, and the temperature detection piece is arranged on the support.

Description

Battery modules, battery packs and electrical equipment Technical Field

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

[0002] Battery modules usually generate heat during use. If the heat is too high, the battery module will experience thermal runaway, which will affect the normal use of the battery module.

[0003] Summary of the Invention

[0004] The present application provides a battery module, a battery pack, and an electrical device to improve the accuracy of temperature detection of the battery module and reduce the possibility of thermal runaway of the battery module.

[0005] In a first aspect, an embodiment of the present application provides a battery module, comprising a shell, a battery cell assembly and a temperature detection element, wherein the shell is provided with a first space; the battery cell assembly is arranged in the first space, the battery cell assembly includes a plurality of battery cell units, the battery cell unit includes a battery cell and a bracket, the battery cell includes a battery cell shell, and the bracket covers at least a portion of the battery cell shell; the temperature detection element is arranged on the bracket.

[0006] The housing protects the battery cell assembly and prevents dust. The bracket is subject to force before the battery cell, thus protecting the battery cell. The temperature sensor's position is more stable, reducing the probability of the temperature sensor moving relative to the battery cell. This improves the accuracy of the battery cell temperature detected by the temperature sensor, facilitating accurate control of the battery cell's charge and discharge based on the battery cell's temperature, and reducing the possibility of battery module damage or failure due to thermal runaway.

[0007] In one or more optional embodiments above, the battery cell further includes an electrode terminal, the battery cell shell includes a main body and a first sealing portion, and the electrode terminal extends out of the battery cell shell from the first sealing portion; the bracket covers at least a portion of the first sealing portion, and the electrode terminal extends from the bracket.

[0008] When at least part of the first seal is subjected to force, the bracket is subjected to force before the first seal, thereby protecting the first seal. The bracket also increases the sealing strength of the first seal, reducing the probability of the first seal breaking when the battery cell does not experience thermal runaway. This allows the temperature detected by the temperature sensor to approach the temperature of the electrode terminal, which helps improve the detection accuracy of the battery cell temperature and reflects the actual temperature of the battery cell.

[0009] In one or more optional embodiments above, the bracket includes a first part, the first sealing part includes an end away from the main body, and the first part covers at least a portion of the end; and the temperature detecting element is arranged on the first part.

[0010] When at least part of the end is subjected to force, the first portion is subjected to force before the end, thereby protecting the end. The first portion also increases the sealing strength of the first sealing portion, reducing the probability of the end breaking when the battery cell does not experience thermal runaway. When the battery cell expands, the force exerted by the battery cell on the temperature detection element is small, reducing the probability of damage to the battery cell and the temperature detection element. This also facilitates the assembly of the temperature detection element onto the battery cell unit after multiple battery cells are assembled into a battery cell assembly.

[0011] In one or more optional embodiments above, the first part includes a main body and a protrusion, the protrusion protrudes from the main body, and the main body covers the end portion; and the temperature detecting member is provided on the protrusion.

[0012] The temperature detection element detects the heat transferred directly from the electrode terminal through the protrusion, which results in less heat loss and less impact on the energy density of the battery module.

[0013] In one or more of the above optional embodiments, the protrusion is provided with a groove, and the temperature detecting element is accommodated in the groove.

[0014] The temperature detection element detects the heat transferred directly from the electrode terminal through the protrusion, which results in less heat loss and less impact on the energy density of the battery module.

[0015] In one or more optional embodiments above, the electrode terminal includes a first section connected to the protrusion; the first section includes a first surface and a second surface oppositely arranged, the first surface is connected to the protrusion, and the second surface is exposed from the protrusion.

[0016] The protrusion supports the electrode terminal, the probability of the electrode terminal being deformed by force is small, and it is convenient for other mechanisms to be electrically connected to the electrode terminal.

[0017] In one or more of the above optional embodiments, at least a portion of the first sealing portion is exposed from the bracket, which is beneficial to pressure relief of the battery cell.

[0018] In one or more of the above optional embodiments, the battery module further includes a fixing member, and the temperature detecting member and the bracket are fixed by the fixing member.

[0019] The position of the temperature detection element on the bracket is further stabilized, and the probability of the temperature detection element moving relative to the battery cell is lowered, thereby making the temperature value of the battery cell detected by the temperature detection element more accurate.

[0020] In one or more optional embodiments above, the fixing member is a thermally conductive adhesive, and the thermal conductivity of the thermally conductive adhesive is 0.8 to 3.0 W / (m·K).

[0021] The thermal conductive adhesive can transfer the heat received from the electrode terminal to the temperature detection component through the bracket, so that the heat loss transferred from the electrode terminal to the temperature detection component is less, and the temperature detected by the temperature detection component is closer to the actual temperature of the electrode terminal, which is conducive to further improving the detection accuracy of the battery cell temperature.

[0022] In one or more of the above optional embodiments, the temperature detecting member and the bracket are interference fit.

[0023] The position of the temperature detection element on the bracket is made more stable, and the probability of the temperature detection element moving relative to the battery cell is lowered, thereby making the temperature value of the battery cell detected by the temperature detection element more accurate.

[0024] In one or more optional embodiments above, the temperature detecting member includes a temperature detector and a wire, the temperature detector is connected to the wire, the temperature detector and the wire are respectively fixed to the bracket, and the wire is in a stretchable state.

[0025] When the battery cell expands and moves, the wire can move with the battery cell, which reduces the probability of damage due to movement and provides greater flexibility.

[0026] In one or more of the above optional embodiments, the battery module further includes an elastic member, which is located at at least one end of the battery cell assembly along the first direction; and the wire is fixed to the elastic member.

[0027] The battery cell assembly abuts the elastic member and the housing, making its position within the housing more stable and less prone to shaking. This improves the stability of the electrical connection between multiple battery cells and reduces the possibility of damage from collision between the cells and the housing. When the battery cells expand, the wires can move with the elastic member, further stabilizing their position.

[0028] In one or more optional embodiments above, the elastic member includes a base, a buffer portion and a connecting portion, the base is connected to the battery cell assembly, the buffer portion connects the connecting portion and the base, the buffer portion is configured to provide expansion space for the battery cell assembly, the connecting portion is fixed to the shell; and the wire is fixed to the connecting portion.

[0029] When the battery cell expands and moves, the buffer provides space for expansion, making the movement of the battery cell more stable and reducing the likelihood of damage from collision with the housing. The wires are also more firmly positioned, ensuring a more stable electrical connection with other components.

[0030] In one or more optional embodiments above, the bracket includes a second part, the main body includes a first wall connected to the first sealing part, and the second part covers at least part of the first wall; the temperature detection component is arranged on the second part.

[0031] When the battery cell unit is subjected to force, the second part is subjected to force before at least part of the first wall, so that the second part plays a protective role for the first wall, and the second part improves the sealing strength of the first sealing part, so that the part of the first sealing part covered by the second part is less likely to break when the battery cell does not produce thermal runaway.

[0032] In one or more of the above optional embodiments, the battery cell is a soft-pack battery cell.

[0033] In one or more of the above optional embodiments, the bracket is integrally formed with the battery cell, thereby improving the connection strength between the bracket and the battery cell.

[0034] In one or more of the above optional embodiments, the housing includes a top wall and a bottom wall arranged opposite to each other along the third direction;

[0035] The bracket is configured to be movable relative to the bottom wall along a second direction, wherein the second direction is perpendicular to the third direction.

[0036] When the battery cell expands, it can move within the shell, reducing the problem of excessive pressure inside the battery cell due to the battery cell being unable to move and thus restricting its expansion.

[0037] In one or more of the above optional embodiments, the battery module includes a structural member, which is arranged between the bottom wall and the battery cell assembly and contacts the battery cell assembly; wherein the friction coefficient between the bracket and the structural member is smaller than the friction coefficient between the battery cell unit and the bottom wall, and along the second direction, the battery cell unit is configured to move on the structural member.

[0038] Compared with battery modules in which the battery cell components are in direct contact with the shell (the battery cell units will directly generate friction with the bottom wall), the battery module of the present application allows the friction between the battery cell units and the structural parts to be smaller when the battery cell units expand and move on the structural parts, thereby reducing the wear of the battery cell units and the possibility of battery cell damage, reducing the possibility of battery cell units leaking or short-circuiting and other problems, thereby extending the service life of the battery module.

[0039] In a second aspect, an embodiment of the present application provides a battery pack, comprising a front cover and a battery module as described above, wherein the front cover is connected to a housing.

[0040] In one or more of the above optional embodiments, the battery pack includes a circuit board, and the front cover is provided with a second space; the circuit board is provided in the second space, and the circuit board is connected to the battery cell assembly.

[0041] The front cover protects the battery cell components and circuit board and prevents dust. The circuit board can control the charging and discharging of the battery cell components.

[0042] In a third aspect, an embodiment of the present application provides an electrical device, including a load and at least one battery pack as described above, wherein the battery pack supplies power to the load. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can also be obtained based on these drawings.

[0044] FIG1 is a schematic diagram of the three-dimensional structure of a battery pack provided in some embodiments of the present application;

[0045] FIG2 is a schematic diagram of an exploded structure of a battery pack provided in some embodiments of the present application;

[0046] FIG3 is a perspective schematic diagram of a battery module structure provided in some embodiments of the present application;

[0047] FIG4 is a perspective schematic diagram of a partial structure of a battery pack provided in some embodiments of the present application;

[0048] FIG5 is a schematic diagram of a partial enlarged structure of the battery pack at point A in FIG4 ;

[0049] FIG6 is a schematic diagram of the three-dimensional structure of a battery cell unit and a temperature detection component of a battery pack provided in some embodiments of the present application;

[0050] FIG7 is a schematic diagram of a partially enlarged structure of the battery pack in FIG6 ;

[0051] FIG8 is a schematic diagram of the three-dimensional structure of a battery cell unit provided in some embodiments of the present application;

[0052] FIG9 is a schematic diagram of a partially enlarged structure of other embodiments of the present application;

[0053] FIG10 is a schematic diagram of the three-dimensional structure of a battery cell of a battery pack provided in some embodiments of the present application;

[0054] FIG11 is a schematic three-dimensional structural diagram of a portion of a battery pack provided in some embodiments of the present application;

[0055] FIG12 is a schematic diagram of a partial enlarged structure of a portion C of the battery pack in FIG11 ;

[0056] FIG13 is a schematic diagram of the three-dimensional structure of a battery cell unit of a battery pack provided by some embodiments of the present application from another perspective;

[0057] FIG14 is a schematic diagram of the three-dimensional structure of an elastic member of a battery pack provided in some embodiments of the present application;

[0058] FIG15 is a schematic diagram of a partially enlarged structure of a portion D of the battery pack in FIG8 .

[0059] Icons: 10-battery module; 11-housing; 1100-first space; 110-top wall; 120-bottom wall; 130-side wall; 12-cell assembly; 200-cell unit; 210-cell; 211-cell housing; 2111-main body; 2112-first sealing portion; 2113-first wall; 2114-second sealing portion; 212-electrode terminal; first section - 2120; first surface - 2120a; second surface - 2120b; 213-second electrode terminal; 220-bracket; 221-first portion; 2211-main body; 21120-end; 2212-protrusion; 2213-groove; 222-second part; 223-first connecting part; 224-second connecting part; 231-third supporting part; 232-fourth supporting part; 2321-notch; 233-third connecting part; 234-fourth connecting part; 230-second bracket; 13-temperature detecting member; 13a-temperature detector; 13b-conducting wire; 14-elastic member; 410-base; 420-buffering part; 430-connecting part; 15-structural member; 20-front cover; 201-connector; 30-circuit board; X-first direction; Y-second direction; Z-third direction.

[0060] Specific embodiment

[0061] To make the purpose, technical solutions, and advantages of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of this application.

[0062] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0063] The terms "first", "second" and the like in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0064] 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.

[0065] 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. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0066] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode sheet, a negative electrode sheet, and a separator. The battery cell primarily operates by the movement of metal ions between the positive and negative electrode sheets. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive electrode current collector, and the portion of the current collector not coated with the positive active material layer serves as the positive terminal. For lithium-ion batteries, for example, the positive electrode current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode sheet includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative electrode current collector, and the portion of the current collector not coated with the negative active material layer serves as the negative terminal. The negative electrode current collector can be made of copper, and the negative active material can be carbon or silicon, among others. To ensure that high currents can be passed without melting, multiple positive electrode tabs are stacked, and multiple negative electrode tabs are stacked. The material of the isolation film can be PP (polypropylene) or PE (polyethylene).

[0067] The structure and materials of the above battery cells determine that the battery cells will generate heat during the charging and discharging process, causing the temperature of the battery cells to rise. If the heat generated by the battery cells is too large, it may not only cause damage or failure of the battery cells themselves, but may also cause short circuits, damage or failure of other battery cells or mechanisms (such as circuit boards or wires, etc.), and even serious safety problems such as smoke, fire, and explosion. In order to reduce the possibility of thermal runaway of the battery module, it is currently possible to monitor the temperature of the battery cell by setting a temperature detection element on the battery cell. However, setting the temperature detection element directly on the battery cell will cause the position of the temperature detection element to be less stable, and the temperature detection element is easy to move relative to the battery cell or even detach from the battery cell, so that the accuracy of the temperature value detected by the temperature detection element is poor, and the possibility of thermal runaway of the battery module is still relatively large.

[0068] In order to improve the accuracy of temperature detection of a battery module, the present application provides a battery module, which includes a shell, a battery cell assembly and a temperature detection component. The shell is provided with a first space, the battery cell assembly is arranged in the first space, the battery cell assembly includes a plurality of battery cell units, the battery cell unit includes a battery cell and a bracket, the battery cell includes a battery cell shell, the bracket covers at least a portion of the battery cell shell, and the temperature detection component is arranged on the bracket.

[0069] In a battery module of this structure, the shell plays a role in protecting and preventing dust from the battery cell assembly; the battery cell assembly includes multiple battery cell units, which makes the energy density of the battery module larger; the bracket covers at least part of the battery cell shell, so that when at least part of the battery cell is subjected to force, the bracket is subjected to the force before the battery cell, thereby protecting the battery cell; the temperature detection element is arranged on the bracket, so that the position stability of the temperature detection element is better, and the probability of the temperature detection element moving relative to the battery cell is lower, thereby making the temperature value of the battery cell detected by the temperature detection element more accurate, which is conducive to accurately controlling the charging and discharging of the battery cell according to the temperature value of the battery cell, and reducing the possibility of damage or failure of the battery module due to thermal runaway of the battery cell.

[0070] The present invention provides a battery pack including a battery module. The battery pack may be a secondary battery or a primary battery, such as a lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, although this embodiment is not limited thereto. The battery pack may be cylindrical, flat, rectangular, or in other shapes, although this embodiment is not limited thereto.

[0071] An embodiment of the present application provides an electrical device that uses at least one battery pack as a power source. The electrical device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, and the like.

[0072] Referring to Figures 1 to 6, Figure 1 is a schematic diagram of the three-dimensional structure of the battery pack provided in some embodiments of the present application; Figure 2 is a schematic diagram of the exploded structure of the battery pack provided in some embodiments of the present application; Figure 3 is a schematic diagram of the three-dimensional structure of the battery module provided in some embodiments of the present application; Figure 4 is a schematic diagram of the three-dimensional structure of a partial structure of the battery pack provided in some embodiments of the present application; Figure 5 is a schematic diagram of the local enlarged structure of point A of the battery pack in Figure 4; Figure 6 is a schematic diagram of the three-dimensional structure of the battery cell unit and the temperature detection component of the battery pack provided in some embodiments of the present application.

[0073] For the convenience of description, some electrode terminals are not shown in a bent state in the drawings.

[0074] An embodiment of the present application provides a battery module 10, which includes a shell 11 and a cell assembly 12. The shell 11 is provided with a first space 1100, and the cell assembly 12 is arranged in the first space 1100, so that the shell 11 plays a role in protecting and dustproofing the cell assembly 12.

[0075] In some embodiments, the shell 11 can be made of a material with higher strength, such as metal materials such as steel, aluminum alloy, etc., so that the shell 11 has a higher force-bearing capacity, thereby reducing the possibility of deformation or damage of the shell 11 due to force or environmental changes, thereby making the battery module 10 more reliable.

[0076] In other embodiments, the shell 11 may also be made of non-metallic materials with relatively high strength, such as carbon fiber, hard plastic, etc.

[0077] In some embodiments, the housing 11 may include a top wall 110 , a bottom wall 120 , and a plurality of side walls 130 . The top wall 110 , the bottom wall 120 , and the plurality of side walls 130 may be fixedly connected by connectors (eg, screws).

[0078] In other embodiments, the top wall 110, the bottom wall 120 and the plurality of side walls 130 may also be fixedly connected by welding, bonding, or positioning fit between projections and grooves.

[0079] In other embodiments, the top wall 110 , the bottom wall 120 , and the plurality of side walls 130 may also be integrally formed.

[0080] In some embodiments, the battery cell assembly 12 includes a plurality of battery cell units 200 , so that the energy density of the battery module 10 is higher.

[0081] In some embodiments, the plurality of battery cell units 200 may be arranged along the second direction Y, such that when the battery cell 210 expands, the battery cell unit 200 moves along the second direction Y relative to the housing 11 .

[0082] In some embodiments, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other. In other embodiments, the first direction X, the second direction Y, and the third direction Z may also intersect each other.

[0083] In some embodiments, the battery cell unit 200 includes a battery cell 210 and a bracket 220. The battery cell 210 includes a battery cell shell 211. The bracket 220 covers at least a portion of the battery cell shell 211, so that when at least a portion of the battery cell 210 is subjected to force, the bracket 220 is subjected to the force before the battery cell 210, thereby protecting the battery cell 210.

[0084] In some embodiments, the bracket 220 covers the battery cell housing 211 in a manner including but not limited to assembly, integral molding, spraying, etc.

[0085] In some embodiments, the battery cell 210 may be in a rectangular parallelepiped, a flat body, a cylinder, or other shapes, which is not limited in the embodiment of the present application.

[0086] In some embodiments, the battery cell 210 may be a soft-pack battery cell.

[0087] In other embodiments, the battery cell 210 may also be a hard-shell battery cell.

[0088] In some embodiments, the bracket 220 can be integrally formed with the battery cell 210, thereby improving the connection strength between the bracket 220 and the battery cell 210. Integral formation refers to direct fixation of the bracket 220 and the battery cell 210. Methods for integral formation include, but are not limited to, potting processes, injection molding processes, and the like.

[0089] In some embodiments, after the insulating material is placed around the battery cell 210 through a pouring process, the insulating material is solidified to form a bracket 220, and the bracket 220 and the battery cell 210 are bonded and fixed. For example, the battery cell 210 is placed in a mold, and the insulating material is poured into the mold. After the insulating material is solidified to form the bracket 220 and is bonded and fixed to the battery cell 210, the bracket 220 and the battery cell 210 are removed from the mold.

[0090] In some embodiments, the insulating material includes but is not limited to potting compound and foaming compound.

[0091] In some embodiments, the injection molding process includes placing the battery cell 210 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 220, which is bonded and fixed to the battery cell 210. The bracket 220 and the battery cell 210 are then removed from the mold. Optionally, the insulating material includes polyamide.

[0092] In some embodiments, the bracket 220 is an insulating bracket, which can reduce the risk of short circuit between the bracket 220 and the battery cell 210 .

[0093] In other embodiments, the bracket 220 may also be fixed to the battery cell 210 via a fixing member or a buckle structure.

[0094] In some embodiments, the battery module 10 includes a temperature detection member 13, which is disposed on the bracket 220. This ensures better position stability of the temperature detection member 13 and reduces the probability of the temperature detection member 13 moving relative to the battery cell 210. This improves the accuracy of the temperature value of the battery cell 210 detected by the temperature detection member 13, facilitates accurate control of the charging and discharging of the battery cell 210 based on the temperature value of the battery cell 210, and reduces the possibility of damage or failure of the battery module 10 due to thermal runaway of the battery cell 210.

[0095] Referring to Figures 6 to 9, Figure 7 is a schematic diagram of the partial enlarged structure of point B of the battery pack in Figure 6; Figure 8 is a schematic diagram of the three-dimensional structure of the battery cell unit of the battery pack provided in some embodiments of the present application; Figure 9 is a schematic diagram of the partial enlarged structure of other embodiments of the present application, wherein the temperature detector 13a is arranged in the second part 222.

[0096] In some embodiments, the battery cell 210 includes an electrode terminal 212 , the battery cell housing 211 includes a main body 2111 and a first sealing portion 2112 , and the electrode terminal 212 extends out of the battery cell housing 211 from the first sealing portion 2112 , so that an external device is electrically connected to the battery cell 210 through the electrode terminal 212 .

[0097] In some embodiments, an electrode assembly (not shown) is disposed in the main body 2111 .

[0098] In some embodiments, the bracket 220 covers at least a portion of the first sealing portion 2112, and the electrode terminal 212 extends from the bracket 220. When at least a portion of the first sealing portion 2112 is subjected to force, the bracket 220 is subjected to force before the first sealing portion 2112, thereby protecting the first sealing portion 2112. The bracket 220 also improves the sealing strength of the first sealing portion 2112, reducing the probability of the first sealing portion 2112 breaking when the battery cell 210 does not experience thermal runaway. This allows the temperature detected by the temperature detection element 13 to be close to the temperature of the electrode terminal 212, which helps improve the accuracy of the temperature detection of the battery cell 210 and reflects the actual temperature of the battery cell 210.

[0099] Please also refer to Figure 10, which is a schematic diagram of the three-dimensional structure of the battery cells of the battery pack provided in some embodiments of the present application.

[0100] In some embodiments, the bracket 220 includes a first portion 221, and the first sealing portion 2112 includes an end portion 21120 distal from the main body 2111. The first portion 221 covers at least a portion of the end portion 21120. When at least a portion of the end portion 21120 is subjected to force, the first portion 221 is subjected to force before the end portion 21120. This allows the first portion 221 to protect the end portion 21120. Furthermore, the first portion 221 increases the sealing strength of the first sealing portion 2112, reducing the probability of the end portion 21120 breaking when the battery cell 210 does not experience thermal runaway.

[0101] In some embodiments, the temperature sensing element 13 is disposed on the first portion 221. When the battery cell 210 expands, the force exerted by the battery cell 210 on the temperature sensing element 13 is relatively small, reducing the probability of damage to the battery cell 210 and the temperature sensing element 13. This also facilitates assembly of the temperature sensing element 13 onto the battery cell units 200 after multiple battery cell units 200 are assembled into the battery cell assembly 12.

[0102] In some embodiments, the first portion 221 includes a main body 2211 and a protrusion 2212 . The protrusion 2212 protrudes from the main body 2211 , and the main body 2211 covers the end portion 21120 . The temperature detecting member 13 is disposed on the protrusion 2212 .

[0103] In some embodiments, the main body 2211 and the protrusion 2212 can be integrally formed.

[0104] In other embodiments, the main body 2211 and the protrusion 2212 may also be fixedly connected by bonding, snapping, or the like.

[0105] When monitoring and adjusting the temperature of the battery cell 210, detecting the hotter portion of the battery cell 210 and promptly adjusting the charge and discharge of the battery cell 210 is a preferred monitoring method for adjusting the temperature of the battery cell 210. During the charge and discharge process of the battery cell 210, the protrusion 2212 contacts the electrode terminal 212, and the temperature detection element 13 is disposed on the protrusion 2212. This allows the temperature detection element 13 to detect heat transferred directly from the electrode terminal 212 through the protrusion 2212, resulting in less heat loss and a minimal impact on the energy density of the battery module 10.

[0106] Please refer to Figures 11 and 12 together. Figure 11 is a three-dimensional structural schematic diagram of a partial structure of a battery pack provided in some embodiments of the present application; Figure 12 is a local enlarged structural schematic diagram of point C of the battery pack in Figure 11.

[0107] In some embodiments, the protrusion 2212 is provided with a groove 2213, and the temperature detection member 13 is accommodated in the groove 2213. This makes the position of the temperature detection member 13 on the bracket 220 more stable, and the probability of the temperature detection member 13 moving relative to the battery cell 210 is reduced, thereby improving the accuracy of the temperature value of the battery cell 210 detected by the temperature detection member 13. In addition, the probability of the temperature detection member 13 interfering with other mechanisms is also reduced.

[0108] In some embodiments, the opening direction of the groove 2213 is parallel to the second direction Y and faces away from the electrode terminal 212 , so that when the detection detector 13 is accommodated in the groove 2213 , the detection detector 13 is located on the side of the protrusion 2212 facing away from the electrode terminal 212 .

[0109] In other embodiments, the opening direction of the groove 2213 may also be parallel to the first direction X and face away from the battery cell 210 , or the opening direction of the groove 2213 may also be parallel to the third direction Z.

[0110] In other embodiments, the protrusion 2212 may not be provided, and a groove 2213 may be provided on the main body 2211 so that the temperature detecting element 13 is accommodated in the groove 2213 .

[0111] 8 , 12 and 13 , FIG13 is a schematic diagram of the three-dimensional structure of the battery cell unit of the battery pack provided in some embodiments of the present application from another perspective.

[0112] In some embodiments, the electrode terminal 212 includes a first section 2120 connected to the protrusion 2212. The first section 2120 includes a first surface 2120a and a second surface 2120b disposed opposite each other. The first surface 2120a is connected to the protrusion 2212, and the second surface 2120b is exposed from the protrusion 2212. This allows the protrusion 2212 to support the electrode terminal 212, minimizing the likelihood of deformation of the electrode terminal 212 under stress and facilitating electrical connection between other devices and the electrode terminal 212.

[0113] In some embodiments, along the second direction Y, the electrode terminal 212 is connected to one side of the protrusion 2212, and the temperature detection element 13 is disposed on the other side of the protrusion 2212. This allows the heat from the electrode terminal 212 to be transferred to the temperature detection element 13 through the protrusion 2212 over a shorter distance, resulting in less heat loss. This allows the temperature detected by the temperature detection element 13 to be closer to the temperature of the electrode terminal 212, thereby further improving the accuracy of detecting the temperature of the battery cell 210.

[0114] In other embodiments, the temperature detecting element 13 may also be disposed on one side of the protrusion 2212 along the first direction X, or on one side of the protrusion 2212 along the third direction Z.

[0115] In some embodiments, at least a portion of the first sealing portion 2112 is exposed from the bracket 220 , which facilitates pressure relief of the battery cell 210 .

[0116] In some embodiments, the battery module 10 includes a fixing member (not shown) by which the temperature sensor 13 and the bracket 220 are fixed. This further stabilizes the position of the temperature sensor 13 on the bracket 220, reduces the probability of the temperature sensor 13 moving relative to the battery cell 210, and thus improves the accuracy of the temperature value of the battery cell 210 detected by the temperature sensor 13.

[0117] In some embodiments, the fixing member may be a thermally conductive adhesive having a thermal conductivity of 0.8 to 3.0 W / (m·K), such as 0.8 W / (m·K), 1.4 W / (m·K), or 3.0 W / (m·K). The thermally conductive adhesive can transfer heat received from the electrode terminal 212 to the temperature detection element 13 via the bracket 220, thereby reducing heat loss from the electrode terminal 212 to the temperature detection element 13. This, in turn, makes the temperature detected by the temperature detection element 13 closer to the actual temperature of the electrode terminal 212, thereby further improving the detection accuracy of the temperature of the battery cell 210.

[0118] In other embodiments, the fixing member may also be other adhesives, which are connected to the portion of the temperature detecting member 13 facing the bracket 220 to reduce heat loss caused by the adhesive and improve the detection accuracy of the temperature of the battery cell 210 .

[0119] In other embodiments, the fixing member may also be a fixing structure such as an elastic snap member, a slot, etc.

[0120] In other embodiments, the temperature detection member 13 and the bracket 220 may be interference-fitted, which makes the position of the temperature detection member 13 on the bracket 220 more stable, reduces the probability of the temperature detection member 13 moving relative to the battery cell 210, and thus improves the accuracy of the temperature value of the battery cell 210 detected by the temperature detection member 13.

[0121] In some embodiments, the temperature detecting element 13 includes a temperature detector 13 a and a wire 13 b . The temperature detector 13 a is connected to the wire 13 b . The temperature detector 13 a is fixed to the bracket 220 , and the wire 13 b is fixed to the bracket 220 .

[0122] In some embodiments, the temperature detector 13 a and the wire 13 b are fixed to the same bracket 220 .

[0123] In some embodiments, the temperature detector 13 a and the wire 13 b may be fixed to different brackets 220 .

[0124] In some embodiments, a portion of the wire 13 b and the temperature detector 13 a are fixed to the same bracket 220 , and a portion of the wire 13 b is also fixed to another bracket 220 .

[0125] 5 , the temperature detector 13a is fixed to the first portion 221 and the wire 13b is fixed to the first portion 221 , which helps reduce the stress on the temperature detector 13a. Optionally, the temperature detector 13a and the wire 13b are fixed to the first portion 221 of the same bracket 220.

[0126] In some embodiments, the temperature detector 13a may be an NTC (Negative Temperature Coefficient) sensor. This allows for a smaller size and space for the temperature detector 13a, minimizing the impact on the energy density of the battery module 10. Furthermore, the NTC temperature sensor offers high detection accuracy, facilitating timely adjustments based on the detected temperature, reducing the likelihood of thermal runaway in the battery module 10. In some embodiments, the temperature detector 13a is cylindrical.

[0127] In other embodiments, the temperature detecting element 13 may also be provided in a square, spherical or other shape.

[0128] In other embodiments, the temperature detector 13a may also be a PTC (Positive Temperature Coefficient) sensor or the like.

[0129] In some embodiments, the wire 13b is in a stretchable state, so that when the battery cell 210 expands and moves, the wire 13b can move with the battery cell 210, which reduces the probability of damage caused by movement and improves flexibility.

[0130] 2 and 3 , in some embodiments, the battery module 10 may include an elastic member 14 located at at least one end of the battery cell assembly 12 along the second direction Y. This allows the battery cell assembly 12 to abut against the elastic member 14 and the housing 11, making the position of the battery cell assembly 12 within the housing 11 more stable and less likely to wobble. This improves the stability of the electrical connection of the multiple battery cell units 200 and reduces the possibility of damage to the battery cell units 200 from colliding with the housing 11.

[0131] In some embodiments, the elastic member 14 is configured to provide expansion space for the battery cell assembly 12 .

[0132] In some embodiments, there is only one elastic member 14 , so that the battery cell assembly 12 remains in contact with the elastic member 14 and the shell 11 before and after expansion, and the elastic member 14 occupies a smaller space, which is beneficial to improving the energy density of the battery module 10 .

[0133] In other embodiments, the number of elastic members 14 may be two, and the two elastic members 14 are respectively located at the two ends of the battery cell assembly 12 along the second direction Y. When the multiple battery cell units 200 expand, the battery cell units 200 can move toward the two ends of the battery cell assembly 12 along the second direction Y, so that the battery cell units 200 near the two ends of the battery cell assembly 12 along the second direction Y move a shorter distance, thereby reducing the wear of the battery cell units 200 near the two ends of the battery cell assembly 12 along the second direction Y and improving the service life of the battery module 10.

[0134] In some embodiments, the wire 13 b is fixed on the elastic member 14 . When the battery cell 200 expands, the wire 13 b can move with the elastic member 14 , making the position of the wire 13 b more stable.

[0135] See FIG. 14 , which is a schematic diagram of the three-dimensional structure of the elastic member of the battery pack provided in some embodiments of the present application.

[0136] In some embodiments, the elastic member 14 includes a base 410, a buffer portion 420, and a connecting portion 430. The base 410 is connected to the battery cell assembly 12, the buffer portion 420 connects the connecting portion 430 and the base 410, and the connecting portion 430 is fixed to the housing 11. When the battery cell assembly 12 expands and moves, the buffer portion 420 is configured to provide expansion space for the battery cell assembly 12, making the movement of the battery cell assembly 12 more stable and reducing the possibility of damage to the battery cell assembly 12 from colliding with the housing 11.

[0137] In some embodiments, the wire 13b is fixed to the connecting portion 430, so that the position of the wire 13b is more stable and the electrical connection with other mechanisms is more stable.

[0138] In some embodiments, the base 410 contacts and connects to the battery cell assembly 12 .

[0139] In some embodiments, other components are provided between the base 410 and the battery cell assembly 12, and the base 410 and the battery cell assembly 12 are connected through the other components. For example, the base 410 and the battery cell assembly 12 are connected through a buffer, and optionally, the buffer includes foam.

[0140] In some embodiments, the elastic member 14 is disposed in the housing 11 to facilitate disassembly and maintenance of the battery module 10 .

[0141] In some embodiments, the connection portion 430 is fixed to the housing 11 .

[0142] In some embodiments, fixing includes but is not limited to abutting, bonding, welding, fastener locking and fixing, snap connection, etc.

[0143] In some embodiments, the housing 11 is provided with a plurality of fixing portions 11 a, and the connecting portion 430 is fixed to the fixing portion 11 a. Optionally, the connecting portion 430 abuts against the fixing portion 11 a.

[0144] In some embodiments, multiple fixing portions 11a are respectively arranged on the top wall 110, the bottom wall 120 and one end of the side wall 130 arranged opposite to each other along the first direction X along the second direction Y, and one end of the battery cell assembly 12 along the second direction Y facing away from the elastic member 14 abuts against the other side wall 130, and the connecting portion 430 abuts against the fixing portion 11a to fix the battery cell assembly 12 and the elastic member 14 between the fixing portion 11a and the other side wall 130.

[0145] 8 and 10 , in some embodiments, the bracket 220 includes a second portion 222, the main body 2111 includes a first wall 2113 connected to the first sealing portion 2112, and the second portion 222 covers at least a portion of the first wall 2113. When the battery cell 200 is subjected to force, the second portion 222 is subjected to force before at least a portion of the first wall 2113, thereby protecting the first wall 2113. Furthermore, the second portion 222 improves the sealing strength of the first sealing portion 2112, reducing the probability of the portion of the first sealing portion 2112 covered by the second portion 222 breaking when the battery cell 210 does not experience thermal runaway.

[0146] In other embodiments, the temperature detecting element 13 may also be disposed on the second portion 222 .

[0147] In some embodiments, the first part 221 and the second part 222 are spaced apart along the first direction X, and a portion of the first sealing portion 2112 is allowed to be exposed between the first part 221 and the second part 222, reserving space for the expansion of the first sealing portion 2112, thereby reducing the possibility of the gas in the first sealing portion 2112 damaging the first sealing portion 2112 or the bracket 220.

[0148] In some embodiments, the bracket 220 includes a first connecting portion 223, which connects the first part 221 and the second part 222, so that the bracket 220 has better force-bearing performance and the overall structure of the bracket 220 is more stable, so that the covering state of the first part 221 and the second part 222 on the first sealing part 2112 is more stable, and the probability of the first part 221 and the second part 222 being displaced relative to the first sealing part 2112 or even detached from the first sealing part 2112 is smaller.

[0149] In some embodiments, the bracket 220 includes a second connecting portion 224, which connects the first part 221 and the second part 222, so that the force-bearing performance of the bracket 220 is better, and the overall structure of the bracket 220 is more stable, so that the covering state of the first part 221 and the second part 222 on the first sealing part 2112 is more stable, and the probability of the first part 221 and the second part 222 being displaced relative to the first sealing part 2112 or even detached from the first sealing part 2112 is smaller.

[0150] In some embodiments, the bracket 220 includes a first connecting portion 223 and a second connecting portion 224 . Along the third direction Z, the first connecting portion 223 and the second connecting portion 224 are spaced apart.

[0151] In some embodiments, the first portion 221 , the second portion 222 , the first connection portion 223 , and the second connection portion 224 may be integrally formed.

[0152] In other embodiments, the first portion 221 , the second portion 222 , the first connection portion 223 and the second connection portion 224 may also be fixedly connected by bonding, snapping or the like.

[0153] In some embodiments, the first connection portion 223 is connected to one end of the first portion 221 and the second portion 222 along the third direction Z, and the second connection portion 224 is connected to the other end of the first portion 221 and the second portion 222 along the third direction Z.

[0154] In other embodiments, the first connection portion 223 and the second connection portion 224 may also be connected between the ends of the first portion 221 and the second portion 222 along the third direction Z, so that the structure of the bracket 220 is more stable and the probability of deformation is lower.

[0155] In some embodiments, the first connection portion 223 and the second connection portion 224 protrude from the battery cell 210 in the third direction Z. This allows the bracket 220 to be stressed before the battery cell 210 when the battery cell unit 200 is subjected to force in the third direction Z, thereby protecting the battery cell 210 .

[0156] In some embodiments, the temperature detection element 13 is disposed on the battery cell unit 200 near the middle of the battery module 10 .

[0157] Among the multiple battery cell assemblies 12, the battery cell unit 200 near the middle of the battery module 10 is the battery cell unit 200 that generates more heat. Therefore, by setting the temperature detection component 13 on the battery cell unit 200 near the middle of the battery module 10, the temperature detection component 13 detects the temperature of the battery cell unit 200 with the highest temperature, which is beneficial to improve the detection accuracy of the temperature of the battery cell 210, so as to timely reduce the temperature of the battery module 10 by controlling the charging and discharging of the battery cell 210, and further reduce the possibility of thermal runaway of the battery module 10.

[0158] In some embodiments, there can be multiple temperature detection elements 13, and multiple temperature detection elements 13 are respectively set on multiple battery cell units 200, wherein at least one temperature detection element 13 is set near the middle of the battery module 10, further making the detection result more accurate.

[0159] 8 , 9 and 15 , FIG15 is a schematic diagram of a partially enlarged structure of a portion D of the battery pack in FIG8 .

[0160] In some embodiments, the cell housing 211 includes a second sealing portion 2114 , and the first sealing portion 2112 and the second sealing portion 2114 are respectively located at both ends of the cell housing 211 along the first direction X. The battery cell 210 includes a second electrode terminal 213 , which is connected to the electrode assembly and extends from the second sealing portion 2114 , allowing other devices to be electrically connected to the electrode assembly through the second electrode terminal 213 .

[0161] In some embodiments, the battery unit 200 includes a second bracket 230, and the second bracket 230 is connected to the second sealing portion 2114. In some embodiments, the bracket 220 and the second bracket 230 have the same structure.

[0162] In some embodiments, the bracket 220 and the second bracket 230 are similar, so repeated description of the same or similar configurations as the bracket 220 of the previous embodiment will be omitted, and hereinafter, focus will be placed on structures different from the previous embodiment.

[0163] In some embodiments, the second bracket 230 is provided with a notch 231, and a portion of the second sealing portion 2114 is located within the notch 231. When the battery cell 210 expands, the pressure inside the battery cell 210 can be discharged through the portion of the second sealing portion 2114 within the notch 231, thereby facilitating the pressure relief of the battery cell 210 and reducing the possibility of thermal runaway of the battery cell unit 200.

[0164] In some embodiments, the notch 231 and the temperature detecting element 13 are provided on different brackets to reduce the risk of damaging the temperature detecting element 13 during pressure relief.

[0165] In some embodiments, the bracket 220 may be provided with a notch 231 as shown in the second bracket 230 .

[0166] In some embodiments, the second bracket 230 is not provided with the protrusion 2212 as shown in FIG. 9 .

[0167] In some embodiments, the bracket 220 is configured to be movable relative to the bottom wall 120 along the second direction Y. This allows the battery cell 210 to move within the housing 11 when it expands, thereby reducing the problem of excessive pressure inside the battery cell 210 caused by the battery cell 210 being unable to move and thus restricting its expansion.

[0168] In some embodiments, the bottom wall 120 supports the battery cell unit 200 .

[0169] In some embodiments, the battery module 10 includes a structural member 15 . The structural member 15 is disposed between the bottom wall 120 and the battery cell assembly 12 and is in contact with the battery cell assembly 12 .

[0170] In some embodiments, the friction coefficient between the bracket 220 and the structural member 15 is less than the friction coefficient between the battery cell unit 200 and the bottom wall 120, and the battery cell unit 200 is configured to move on the structural member 15 along the second direction Y. Compared with a battery module in which the battery cell assembly 12 is in direct contact with the housing 11 (the battery cell unit 200 will directly rub against the bottom wall 120), the battery module 10 of the present application allows the battery cell unit 200 to expand and move on the structural member 15. The friction between the battery cell unit 200 and the structural member 15 is smaller, thereby reducing the wear of the battery cell unit 200 and the possibility of damage to the battery cell unit 200. The possibility of leakage or short circuit of the battery cell unit 200 is reduced, thereby extending the service life of the battery module 10.

[0171] In some embodiments, an insulating layer is provided on the surface of the structural member 15 facing the cell assembly 12 to strengthen the insulation between the cell assembly 12 and the bottom wall 120. Referring to Figures 1 and 2, in some embodiments, the bottom wall 120 is provided with two first stoppers 121. The two first stoppers 121 extend along the second direction Y and are spaced apart along the first direction X. Part of the cell assembly 12 is disposed between the two first stoppers 121 along the first direction X. These two first stoppers 121 serve to limit the cell assembly 12, allowing the cell assembly 12 to move along the second direction Y when expanding, thereby further stabilizing the overall structure of the battery module 10.

[0172] In some embodiments, the first limiting portion 121 can be formed by a portion of the bottom wall 120 being recessed toward the battery cell assembly 12 , which is easy to manufacture.

[0173] In other embodiments, the first limiting portion 121 may also be fixed to the bottom wall 120 by bonding, welding, or the like.

[0174] In some embodiments, the top wall 110 is provided with two second limiting portions 111. The two second limiting portions 111 extend along the second direction Y and are spaced apart along the first direction X. Part of the battery cell assembly 12 is disposed between the two second limiting portions 111 along the first direction X. The two second limiting portions 111 limit the battery cell assembly 12, allowing the battery cell assembly 12 to move along the second direction Y when expanding, thereby further stabilizing the overall structure of the battery module 10.

[0175] In some embodiments, the second limiting portion 111 can be formed by a portion of the top wall 110 being recessed toward the battery cell assembly 12 , which is easy to manufacture.

[0176] In other embodiments, the second limiting portion 111 may also be fixed to the top wall 110 by bonding, welding, or the like.

[0177] 1 and 2 , an embodiment of the present application provides a battery pack, which includes a front cover 20 and a battery module 10 provided in any of the above embodiments, wherein the front cover 20 is connected to the housing 11 .

[0178] In some embodiments, the front cover 20 can be made of a material with higher strength, such as metal materials such as steel, aluminum alloy, etc., so that the front cover 20 has higher acceptance performance, thereby reducing the possibility of deformation or damage of the front cover 20 due to force or environmental changes, thereby making the battery module 10 more reliable.

[0179] In other embodiments, the front cover 20 may also be made of non-metallic materials with relatively high strength, such as carbon fiber, hard plastic, etc.

[0180] In some embodiments, the housing 11 and the front cover 20 may be fixedly connected by connecting members (eg, screws).

[0181] In other embodiments, the housing 11 and the front cover 20 may also be fixedly connected by welding, bonding, interference fit or other methods.

[0182] In some embodiments, the battery pack includes a circuit board 30. The front cover 20 defines a second space, within which the circuit board 30 is located. The circuit board 30 is connected to the battery cell assembly 12. The front cover 20 protects the battery cell assembly 12 and the circuit board 30 from dust. The circuit board 30 also controls the charging and discharging of the battery cell assembly 12.

[0183] In some embodiments, a connector 201 is further provided on the front cover 20 , and the connector 201 is connected to the circuit board 30 , so that an external device is electrically connected to the circuit board 30 through the connector 201 .

[0184] In some embodiments, the circuit board 30 may include a printed circuit board (PCB).

[0185] In other embodiments, the circuit board 30 may include a flexible printed circuit (FPC).

[0186] In some embodiments, the temperature detecting element 13 may be electrically connected to the circuit board 30 via a wire.

[0187] An embodiment of the present application provides an electrical device, which includes a load and at least one battery pack provided by any of the above embodiments, and the battery pack supplies power to the load.

[0188] The power-consuming device may be any of the aforementioned devices or systems using the battery pack.

[0189] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0190] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery module, characterized in that, it includes: a housing provided with a first space; a battery cell assembly disposed in the first space, the battery cell assembly including a plurality of battery cell units, the battery cell units including battery cells and brackets, the battery cells including battery cell housings, and the brackets covering at least part of the battery cell housings; a temperature detection member disposed on the bracket.

2. The battery module according to claim 1, characterized in that, the battery cell further includes electrode terminals, the battery cell housing includes a main body portion and a first sealing portion, and the electrode terminals extend out of the battery cell housing from the first sealing portion; the bracket covers at least part of the first sealing portion, and the electrode terminals extend out of the bracket.

3. The battery module according to claim 2, characterized in that, the bracket includes a first part, the first sealing portion includes an end portion away from the main body portion, and the first part covers at least part of the end portion; the temperature detection member is disposed on the first part.

4. The battery module according to claim 3, characterized in that, the first part includes a main body and a protrusion, the protrusion protruding from the main body, and the main body covering the end portion; the temperature detection member is disposed on the protrusion.

5. The battery module according to claim 4, characterized in that, the protrusion is provided with a groove, and the temperature detection member is received in the groove.

6. The battery module according to claim 4 or 5, characterized in that, the electrode terminal includes a first section, and the first section is connected to the protrusion; the first section includes a first surface and a second surface disposed opposite to each other, the first surface being connected to the protrusion and the second surface being exposed from the protrusion.

7. The battery module according to any one of claims 2-6, characterized in that, at least part of the first sealing portion is exposed from the bracket.

8. The battery module according to any one of claims 1-7, characterized in that, the battery module further includes a fixing member, and the temperature detection member and the bracket are fixed by the fixing member.

9. The battery module according to claim 8, characterized in that, the fixing member is a thermal conductive adhesive, and the thermal conductivity of the thermal conductive adhesive is: 0.8-3.0 W / (m·K).

10. The battery module according to any one of claims 1-9, characterized in that, the temperature detection member and the bracket are in interference fit.

11. The battery module according to any one of claims 1-10, characterized in that, the temperature detection member includes a temperature detector and a wire, the temperature detector is connected to the wire, the temperature detector and the wire are respectively fixed to the bracket, and the wire is in a stretchable state.

12. The battery module according to claim 11, characterized in that, the battery module further includes an elastic member, and the elastic member is located at at least one end of the battery cell assembly along the first direction; the wire is fixed to the elastic member.

13. The battery module according to claim 12, characterized in that, The elastic member includes a base portion, a buffer portion, and a connecting portion. The base portion is connected to the battery cell assembly. The buffer portion is connected to the connecting portion and the base portion. The buffer portion is configured to provide an expansion space for the battery cell assembly. The connecting portion is fixed to the housing; The wire is fixed to the connecting portion.

14. The battery module according to any one of claims 2-13, wherein, The bracket includes a second portion. The main body portion includes a first wall connecting the first sealing portion. The second portion covers at least a part of the first wall; The temperature detection member is disposed on the second portion.

15. The battery module according to any one of claims 1-14, wherein, The battery cell is a soft-pack battery cell.

16. The battery module according to any one of claims 1-15, wherein, The bracket is integrally formed on the battery cell.

17. The battery module according to any one of claims 1-16, wherein, The housing includes a top wall and a bottom wall oppositely disposed along a third direction; Along a second direction, the bracket is configured to be movable relative to the bottom wall; wherein, the second direction is perpendicular to the third direction.

18. The battery module according to claim 17, wherein, The battery module includes a structural member. The structural member is disposed between the bottom wall and the battery cell assembly and is in contact with the battery cell assembly; wherein, the friction coefficient between the bracket and the structural member is less than the friction coefficient between the battery cell unit and the bottom wall. Along the second direction, the battery cell unit is configured to move on the structural member.

19. A battery pack, wherein, It includes a front cover and the battery module according to any one of claims 1 to 18. The front cover is connected to the housing.

20. The battery pack according to claim 19, wherein, The battery pack includes a circuit board. The front cover is provided with a second space; The circuit board is disposed in the second space and is connected to the battery cell assembly.

21. An electrical device, wherein, It includes a load and at least one battery pack according to claim 19 or 20. The battery pack supplies power to the load.

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