Battery monomer, battery and electric equipment

Abstract

The utility model discloses a battery monomer, a battery and electric equipment. The battery monomer in the embodiment of the utility model comprises a shell, an electrode assembly, an insulating part and a heat dissipation part, the electrode assembly is accommodated in the housing. The insulating part is arranged between the shell and the electrode assembly, and the insulating part is provided with a mounting part. And the heat dissipation piece is connected with the mounting part. The heat dissipation piece comprises a first face and a second face which are opposite. The first face is thermally conductively connected to the housing. The second surface is thermally conductively connected to the electrode assembly. In the battery monomer, the first surface is in heat-conducting connection with the shell, and the second surface is in heat-conducting connection with the electrode assembly. Therefore, heat generated by the electrode assembly in the electrochemical reaction process can be transmitted to the heat dissipation piece and further dissipated to the external environment through the shell. The shell has a relatively large heat dissipation area, so that the internal temperature of the battery monomer can be effectively reduced, the heat dissipation capability of the battery monomer is improved, the performance of the battery monomer is improved, and the service life of the battery monomer is prolonged.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and in particular, to a battery cell, a battery, and an electrical device. Background Art

[0002] A battery cell includes a housing and an electrode assembly disposed inside the housing. During the charging process of the battery cell, an electrochemical reaction occurs in the electrode assembly, and a large amount of heat is released during the reaction process. Due to the lack of effective heat dissipation means, the internal temperature of the battery cell is relatively high. Therefore, how to improve the heat dissipation ability of the battery cell is a technical problem that those skilled in the art urgently need to solve. Summary of the Utility Model

[0003] This application provides a battery cell, a battery, and an electrical device, which can improve the heat dissipation ability of the battery cell.

[0004] The battery cell according to an embodiment of this application includes a housing, an electrode assembly, an insulating member, and a heat dissipation member. The electrode assembly is accommodated in the housing. The insulating member is disposed between the housing and the electrode assembly, and the insulating member is provided with a mounting portion. The heat dissipation member is connected to the mounting portion. The heat dissipation member includes a first surface and a second surface facing away from each other. The first surface is thermally connected to the housing. The second surface is thermally connected to the electrode assembly.

[0005] In the battery cell according to an embodiment of this application, the first surface is thermally connected to the housing, and the second surface is thermally connected to the electrode assembly. This enables the heat generated by the electrode assembly during the electrochemical reaction process to be transferred to the heat dissipation member and further dissipated to the external environment through the housing. Since the housing has a large heat dissipation area, this can effectively reduce the internal temperature of the battery cell, improve the heat dissipation ability of the battery cell, and thus improve the performance and lifespan of the battery cell.

[0006] In some embodiments, the electrode assembly includes a tab. The tab is disposed on a side of the electrode assembly close to the insulating member. The second surface is thermally connected to the tab.

[0007] In this way, by disposing the tab on the side of the electrode assembly close to the insulating member and thermally connecting it to the second surface of the heat dissipation member, a heat conduction path from the tab to the heat dissipation member is formed, so that the heat on the tab can be transferred to the heat dissipation member and further dissipated to the external environment through the housing. Since the housing has a large heat dissipation area, this can effectively reduce the internal temperature of the battery cell, improve the heat dissipation ability of the battery cell, and thus improve the performance and lifespan of the battery cell.

[0008] In some embodiments, the battery cell further includes a terminal post. The terminal post passes through the insulating member and the housing. The second surface is thermally connected to the terminal post.

[0009] Thus, as a component connecting the external circuit of the battery cell, the terminal post is thermally connected to the second surface of the heat sink, which can effectively conduct heat to the external environment, thereby improving the heat dissipation efficiency.

[0010] In some embodiments, the electrode assembly includes a tab. The tab is disposed on a side of the electrode assembly close to the insulating member. The battery cell further includes a transfer structure. The transfer structure is disposed between the tab and the second surface, and the transfer structure is thermally connected to both the tab and the second surface.

[0011] Thus, the transfer structure is disposed between the tab and the second surface of the heat sink, providing an additional heat conduction path, which helps to more effectively transfer the heat generated by the tab to the heat sink. In addition, the transfer structure helps to more evenly disperse the heat generated by the tab, avoiding excessive heat concentration at the tab, thereby improving the heat dissipation uniformity of the entire battery cell.

[0012] In some embodiments, the transfer structure is welded to the tab and a welding zone is formed. The orthographic projection of the welding zone on the second surface is located within the second surface.

[0013] Thus, the setting of the welding zone enhances the mechanical connection strength between the transfer structure and the tab. During the use of the battery cell, even under conditions such as vibration or impact, the connection stability between the transfer structure and the tab can be maintained. The transfer structure can be used to transmit the current output on the tab. As a current channel, the welding zone has a higher temperature. The orthographic projection of the welding zone on the second surface is located within the second surface, enabling the heat on the transfer structure to be effectively transferred to the heat sink.

[0014] In some embodiments, the battery cell further includes a terminal post. The terminal post includes a column body and a heat conducting portion. The heat conducting portion is disposed on a side of the column body close to the electrode assembly. The column body penetrates through the insulating member and the outer shell. The transfer structure includes a first connection portion and a second connection portion connected to the first connection portion. The first connection portion is thermally connected to the heat conducting portion. The second connection portion is thermally connected to the second surface, and the orthographic projection of the second connection portion on the second surface is located within the second surface.

[0015] Thus, the transfer structure includes a first connection portion and a second connection portion. The first connection portion is thermally connected to the heat conducting portion, and the second connection portion is thermally connected to the second surface, which forms at least two independent heat dissipation paths, enabling the heat on the electrode assembly to be transferred to the external environment through the terminal post or through the heat sink and the outer shell, thereby improving the heat dissipation efficiency. The orthographic projection of the second connection portion on the second surface is located within the second surface, which provides a large contact area between the second connection portion and the heat sink, enabling the heat on the second connection portion to be effectively transferred to the heat sink.

[0016] In some embodiments, the battery cell further includes a seal. The seal is located between the outer casing and the cylinder, the seal is sleeved on the cylinder, and the minimum distance between the seal and the heat dissipation member is greater than or equal to 2 mm.

[0017] Thus, the seal is located between the outer casing and the cylinder and is sleeved on the cylinder, which helps with electrical insulation between the terminal post and the battery outer casing, reducing the probability of electrical short - circuit or leakage.

[0018] When the minimum distance between the seal and the heat dissipation member is greater than or equal to 2 mm, the influence of the heat dissipation member on the seal is small, which can reduce the probability of the seal overheating due to too close contact with the heat dissipation member, thereby extending the service life of the seal and maintaining its performance. Also, this can reduce the risk of the seal aging and being damaged due to high temperature, thus reducing potential safety risks such as electrical short - circuit or leakage.

[0019] In some embodiments, the mounting portion includes a mounting groove, and the mounting groove includes a bottom wall and a side wall connected at an angle. The heat dissipation member further includes a side surface connecting the first surface and the second surface. The side surface includes a first region and a second region connected at an angle. The first region contacts the bottom wall. The second region contacts the side wall.

[0020] Thus, since the connection between the heat dissipation member and the mounting portion is achieved only by the limiting of the groove wall of the mounting groove and the surface of the heat dissipation member itself, specifically by the contact between the groove wall of the mounting groove and the side surface of the heat dissipation member, a stable connection relationship is formed, eliminating the need for additional fasteners to prevent the displacement or rotation of the heat dissipation member. This saves additional components and complex fasteners, simplifies the manufacturing process, and thus reduces material and manufacturing costs.

[0021] In some embodiments, the mounting portion includes a mounting groove. The insulating member includes a body and a first clamping portion connected to the body. The heat dissipation member is disposed in the mounting groove, and the heat dissipation member includes a first part and a second part stacked. A second clamping portion is formed between the first part and the second part. The first clamping portion is clamped with the second clamping portion.

[0022] Thus, the clamping structure improves the stability and retention force of the overall structure of the heat dissipation member and the insulating member, reducing the displacement or vibration of the heat dissipation member and the insulating member during transportation or use. The clamping structure reduces potential errors during the assembly process, improves the manufacturing efficiency of the battery cell, and enhances the reliability of the battery cell.

[0023] In some embodiments, one of the first clamping portion and the second clamping portion is a clamping block, and the other is a clamping hole.

[0024] In this way, the design of the clamping block and the clamping hole simplifies the assembly process and reduces the assembly complexity.

[0025] In some embodiments, the heat dissipation member is provided with a first welding portion. The first welding portion is recessed into the heat dissipation member in a direction close to the electrode assembly. The housing is provided with a second welding portion. The second welding portion is recessed into the housing in a direction away from the electrode assembly. The first welding portion and the second welding portion are disposed opposite to each other. The insulating member is provided with a third welding portion. The third welding portion is welded to both the first welding portion and the second welding portion.

[0026] In this way, the recessed welding portion design and the relative arrangement of the first welding portion and the second welding portion contribute to accurate alignment during the welding process, thereby improving the positioning accuracy among the insulating member, the heat dissipation member, and the housing, and thus enhancing the overall assembly quality of the insulating member, the heat dissipation member, and the housing. A stable connection is formed through welding, reducing the risk of separation of the insulating member, the heat dissipation member, and the housing during transportation or use.

[0027] In some embodiments, the first welding portion is provided with a first connection hole and a second connection hole communicating with the first connection hole. The aperture of the first connection hole is smaller than that of the second connection hole. The second welding portion includes a third connection hole and a fourth connection hole communicating with the third connection hole. The aperture of the third connection hole is smaller than that of the fourth connection hole;

[0028] The third welding portion includes a main body portion and a first extension portion and a second extension portion connected to opposite ends of the main body portion. The main body portion passes through the first connection hole and the third connection hole, and the main body portion is welded to both the first welding portion and the second welding portion. The first extension portion cooperates with the second connection hole, and the second extension portion cooperates with the fourth connection hole.

[0029] In this way, the first welding portion and the second welding portion include two sets of connection holes with different apertures, and the welding connection with the main body portion of the third welding portion form a more stable welding structure. This significantly improves the connection stability among the housing, the heat dissipation member, and the insulating member. The cooperation between the first extension portion and the second connection hole, and the cooperation between the second extension portion and the fourth connection hole provide mechanical double locking, further enhancing the mechanical strength and anti-deformation ability of the overall structure of the housing, the heat dissipation member, and the insulating member.

[0030] In some embodiments, the number of the mounting portions and the heat dissipation members is multiple, and the mounting portions correspond to the heat dissipation members one by one.

[0031] In this way, the heat dissipation member can provide heat dissipation functions in multiple regions, enabling heat to be transferred to the housing from multiple different paths, thereby improving the overall heat dissipation efficiency of the battery cell.

[0032] In certain embodiments, the housing includes a housing body and an end cap. The housing body has an opening. The end cap is connected to the housing body and seals the opening. The insulating member is disposed between the end cap and the electrode assembly. The first surface is thermally connected to the end cap.

[0033] This allows heat to be transferred from the electrode assembly to the heat sink, and from there to the end cap, ultimately dissipating it to the external environment. Because the housing has a large heat dissipation area, this effectively reduces the internal temperature of the battery cells, improving their heat dissipation capabilities and ultimately extending their performance and lifespan.

[0034] In certain embodiments, the housing includes a housing body and an end cap. The housing body has an opening. The end cap is connected to the housing body and seals the opening. The insulating member is disposed between the housing body and the electrode assembly, and the first surface is thermally connected to the housing body.

[0035] This allows heat to be transferred from the electrode assembly to the heat sink, which then transfers it to the housing, where it is then dissipated to the external environment. Because the housing has a large heat dissipation area, this effectively reduces the internal temperature of the battery cells, improving their heat dissipation capabilities and ultimately extending their performance and lifespan.

[0036] The battery according to the embodiment of the present application includes the battery cell described in any of the above embodiments.

[0037] Since the battery includes the above-mentioned battery cells, the battery at least includes all the beneficial effects of the above-mentioned battery cells, which will not be described in detail here.

[0038] The electrical equipment of the embodiment of the present application includes the battery described in the above embodiment or the battery cell described in any of the above embodiments.

[0039] Since the electrical device includes the above-mentioned battery, the electrical device at least includes all the beneficial effects of the above-mentioned battery, which will not be described in detail here.

[0040] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, in all the drawings, the same reference numerals are used to denote the same components. In the drawings:

[0042] Figure 1 is a schematic structural diagram of an electrical device provided by some embodiments of the present application;

[0043] Figure 2 is an explosion schematic diagram of a battery provided by some embodiments of the present application;

[0044] Figure 3 is a schematic structural diagram of a battery cell provided by some embodiments of the present application;

[0045] Figure 4 is a schematic structural diagram of a battery cell provided by some other embodiments of the present application;

[0046] Figure 5 is Figure 4 a cross-sectional view of the battery cell in the A-A direction;

[0047] Figure 6 is Figure 5 an enlarged view of part A of the battery cell;

[0048] Figure 7 is a partial disassembly schematic diagram of a battery cell provided by some embodiments of the present application;

[0049] Figure 8 is a schematic structural diagram of a battery cell provided by some other embodiments of the present application;

[0050] Figure 9 is a schematic structural diagram of a battery cell provided by some other embodiments of the present application;

[0051] Figure 10 is Figure 5 an enlarged view of part B of the battery cell;

[0052] Figure 11 is a schematic structural diagram of a heat dissipation member provided by some embodiments of the present application;

[0053] Figure 12 is a partial structural schematic diagram of a battery cell provided by some embodiments of the present application;

[0054] Figure 13 is Figure 12 a cross-sectional view of the battery cell in the B-B direction;

[0055] Figure 14 is Figure 13An enlarged view of part C of a battery cell;

[0056] Figure 15 is a schematic structural diagram of a heat sink provided in other embodiments of the present application;

[0057] Figure 16 yes Figure 12 A cross-sectional view of a battery cell in the BB direction;

[0058] Figure 17 yes Figure 16 An enlarged view of part D of a battery cell.

[0059] Description of Figure Numbers:

[0060] Electrical device 1000; battery 200; controller 300; motor 400; battery cell 100; housing 201; first housing 202; second housing 203; housing 10; housing body 11; end cap 12; opening 110; electrode assembly 20; insulating member 30; mounting portion 31; heat sink 40; first surface 41; second surface 42; pressure relief mechanism 50; tab 21; pole 60; adapter structure 70; welding area 71; column 61; heat conducting portion 62; stopper 63; insulating member 64; first connecting portion 72; second connecting portion Connecting portion 73; sealing member 80; mounting groove 310; bottom wall 311; side wall 312; side surface 43; first area 430; second area 431; main body 32; first clamping portion 33; first portion 44; second portion 45; second clamping portion 46; clamping block 101; clamping hole 102; first welding portion 47; second welding portion 13; third welding portion 34; first connecting hole 470; second connecting hole 471; third connecting hole 130; fourth connecting hole 131; main body 340; first extension portion 341; second extension portion 342. DETAILED DESCRIPTION

[0061] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

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

[0063] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects, and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality" is more than two, unless otherwise specifically defined.

[0064] Reference to "embodiments" in this document means that the specific features, structures, or characteristics described in connection with the embodiments may be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

[0065] In the description of the embodiments of the present application, the term "and / or" is merely a description of the relationship between associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally represents an "or" relationship between the associated objects before and after.

[0066] In the description of the embodiments of the present application, the term "a plurality" refers to more than two (including two). Similarly, "a plurality of groups" refers to more than two groups (including two groups), and "a plurality of pieces" refers to more than two pieces (including two pieces).

[0067] In the description of the embodiments of the present application, technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation on the embodiments of the present application.

[0068] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0069] Currently, from the perspective of the development of the market situation, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric transportation such as electric bicycles, electric motorcycles, and electric vehicles, as well as in multiple fields such as aerospace. With the continuous expansion of the application fields of batteries, the market demand is also continuously increasing.

[0070] During the charging process of a battery cell, a large amount of heat is generated by the electrochemical reaction in the electrode assembly. Without an effective heat dissipation mechanism, it will cause the internal temperature of the battery to rise, affecting the performance and lifespan of the battery, and even leading to thermal runaway in extreme cases. Therefore, improving the heat dissipation ability of the battery cell has become a technical problem to be solved urgently.

[0071] To solve this problem, a material with a high thermal conductivity can be used as the outer shell to improve the heat dissipation ability of the battery cell. However, high-thermal-conductivity materials will increase the cost, and the heat is mainly transferred between the shell and the electrode assembly through the electrolyte or air, resulting in a low heat conduction efficiency.

[0072] To solve the problem of low heat conduction efficiency and improve the heat dissipation ability of the battery cell. An embodiment of the present application provides a battery cell, which includes an outer shell, an electrode assembly, an insulating member, and a heat dissipation member. The electrode assembly is accommodated in the outer shell. The insulating member is disposed between the outer shell and the electrode assembly, and the insulating member is provided with a mounting portion. The heat dissipation member is connected to the mounting portion. The heat dissipation member includes a first surface and a second surface facing away from each other. The first surface is thermally connected to the outer shell. The second surface is thermally connected to the electrode assembly.

[0073] In the battery cell of the embodiment of the present application, the first surface is thermally connected to the outer shell, and the second surface is thermally connected to the electrode assembly. This enables the heat generated by the electrode assembly during the electrochemical reaction to be transferred to the heat dissipation member and further dissipated to the external environment through the outer shell. Since the outer shell has a large heat dissipation area, this can effectively reduce the internal temperature of the battery cell, improve the heat dissipation ability of the battery cell, and thus improve the performance and lifespan of the battery cell.

[0074] This design not only improves the heat dissipation efficiency, but also realizes more effective heat conduction due to the direct contact between the heat dissipation member and the electrode assembly and the outer shell. In addition, this solution does not require changing the material of the outer shell, so while maintaining the cost-effectiveness of the battery cell, the heat dissipation performance is improved.

[0075] Please refer to Figure 1 , Figure 1It is a schematic structural diagram of an electrical device 1000 provided by some embodiments of the present application. The electrical device 1000 in the embodiments of the present application uses a battery or a battery cell as a power source. The electrical device 1000 can be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, and the like. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric aircraft toy, and the like. The spacecraft can include an airplane, a rocket, a space shuttle, a spaceship, and the like.

[0076] For the convenience of description in the following embodiments, a vehicle, which is an electrical device 1000 in the embodiments of the present application, is taken as an example for illustration.

[0077] A battery 200 is disposed inside the vehicle. The battery 200 can be disposed at the bottom, the head, or the tail of the vehicle. The battery 200 can be used for power supply of the vehicle. For example, the battery 200 can be used as an operating power source of the vehicle.

[0078] The vehicle may further include a controller 300 and a motor 400. The controller 300 is used to control the battery 200 to supply power to the motor 400. For example, it is used for the working power requirements during the start, navigation, and driving of the vehicle.

[0079] In the embodiments of the present application, the battery 200 can not only be used as an operating power source of the vehicle, but also be used as a driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0080] Please refer to Figure 2 , Figure 2 It is an exploded schematic diagram of the battery 200 provided by some embodiments of the present application. The battery 200 includes a battery cell 100 and a box body 201. The box body 201 is used to accommodate the battery cell 100.

[0081] In the embodiments of the present application, the battery cell 100 can include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, a magnesium-ion battery, etc. The embodiments of the present application do not limit this. The battery cell 100 can be in a cylindrical shape, a flat shape, a cuboid shape, or other shapes, etc. The embodiments of the present application do not limit this either. Generally, the battery cell 100 is divided into three types according to the packaging method: a cylindrical battery cell, a square battery cell, and a soft-pack battery cell. The embodiments of the present application do not limit this either.

[0082] The battery 200 mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells 100 to provide higher voltage and capacity. For example, the battery 200 mentioned in the embodiments of the present application may include a battery module, a battery pack, etc. The battery 200 generally includes a box body 201 for encapsulating one or more battery cells 100. The box body 201 can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells 100.

[0083] Among them, the box body 201 is a component for accommodating the battery cells 100. The box body 201 provides an accommodation space for the battery cells 100, and the box body 201 can adopt various structures. In some embodiments, the box body 201 may include a first box body 202 and a second box body 203. The first box body 202 and the second box body 203 cover each other to define an accommodation space for accommodating the battery cells 100. The first box body 202 and the second box body 203 can be of various shapes, such as a cuboid, a cylinder, etc. The first box body 202 can be a hollow structure with one side open, and the second box body 203 can also be a hollow structure with one side open. The open side of the second box body 203 covers the open side of the first box body 202, thus forming the box body 201 with an accommodation space. It can also be that the first box body 202 is a hollow structure with one side open, and the second box body 203 is a plate-like structure. The second box body 203 covers the open side of the first box body 202, thus forming the box body 201 with an accommodation space. The first box body 202 and the second box body 203 can be sealed through a sealing element, and the sealing element can be a sealing ring, a sealant, etc.

[0084] In the battery 200, when there are multiple battery cells 100, the multiple battery cells 100 can be connected in series, parallel, or in a mixed connection. A mixed connection means that there are both series and parallel connections among the multiple battery cells 100. It can be that multiple battery cells 100 are first connected in series, parallel, or in a mixed connection to form a battery module, and then multiple battery modules are connected in series, parallel, or in a mixed connection to form a whole and are accommodated in the box body 201. It can also be that all the battery cells 100 are directly connected in series, parallel, or in a mixed connection together, and then the whole formed by all the battery cells 100 is accommodated in the box body 201.

[0085] In some embodiments, the battery 200 may further include a busbar component. The multiple battery cells 100 can be electrically connected through the busbar component to achieve series, parallel, or mixed connection of the multiple battery cells 100. The busbar component can be a metal conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0086] In some embodiments, the battery 200 can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0087] Please refer to Figure 3 、 Figure 4 、Figure 5 and Figure 6 , Figure 3 is a schematic structural view of the battery cell 100 provided in some embodiments of the present application; Figure 4 is a schematic structural view of the battery cell 100 provided in some other embodiments of the present application; Figure 5 is Figure 4 a cross-sectional view of the battery cell 100 in the A-A direction of; Figure 6 is Figure 5 an enlarged view of part A of the battery cell 100 of. The battery cell 100 according to the embodiment of the present application includes a housing 10, an electrode assembly 20, an insulating member 30, and a heat dissipation member 40. The electrode assembly 20 is received in the housing 10. The insulating member 30 is disposed between the housing 10 and the electrode assembly 20, and the insulating member 30 is provided with a mounting portion 31. The heat dissipation member 40 is connected to the mounting portion 31. The heat dissipation member 40 includes a first surface 41 and a second surface 42 facing away from each other. The first surface 41 is thermally connected to the housing 10. The second surface 42 is thermally conductive with the electrode assembly 20

[0088] Specifically, the housing 10 is a protective structure of the battery cell 100. The housing 10 not only protects the internal components from external physical damage, but also participates in heat conduction as part of the heat dissipation path. The housing 10 may include a housing body 11 and an end cap 12. The housing body 11 is provided with an opening 110. The end cap 12 is connected to the housing body 11 and closes the opening 110.

[0089] The end cap 12 refers to a component that covers the opening 110 of the housing body 11 to isolate the internal environment of the battery cell 100 from the external environment. Without limitation, the shape of the end cap 12 may be adapted to the shape of the housing body 11 to cooperate with the housing body 11. Optionally, the end cap 12 may be made of a material having a certain hardness and strength (such as aluminum alloy). In this way, the end cap 12 is not easily deformed when subjected to extrusion and collision, so that the battery cell 100 can have higher structural strength and the safety performance can also be improved.

[0090] Please refer to Figure 7 , Figure 7 which is a partial disassembled schematic view of the battery cell 100 provided in some embodiments of the present application. In some embodiments, a pressure relief mechanism 50 for relieving the internal pressure when the internal pressure or temperature of the battery cell 100 reaches a threshold may be further provided on the end cap 12. The pressure relief mechanism 50 may be an explosion-proof valve or a notch. The material of the end cap 12 may also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. The embodiments of the present application do not make special limitations thereto.

[0091] The housing 11 is a component that cooperates with the end cap 12 to form the internal environment of the battery cell 100. This internal environment can be used to accommodate the electrode assembly 20, electrolyte, and other components. The housing 11 and the end cap 12 can be independent components. An opening 110 can be provided on the housing 11, and the end cap 12 is placed over the opening 110 to form the internal environment of the battery cell 100. Alternatively, the end cap 12 and the housing 11 can be integrated. Specifically, the end cap 12 and the housing 11 can form a common connection surface before other components are inserted into the housing. When the interior of the housing 11 needs to be encapsulated, the end cap 12 is placed over the housing 11.

[0092] The housing 11 can have various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the housing 11 can be determined based on the specific shape and size of the electrode assembly 20. The housing 11 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the present embodiment does not impose any particular limitations on this.

[0093] The insulating member 30 is a component for isolating electric current. The mounting portion 31 may be a structure on the insulation for connecting the heat sink 40. The mounting portion 31 may be a groove, a surface of the insulating member 30, or the like. For example, the mounting portion 31 may be a surface on the insulating member 30 that is connected to the heat sink 40, and the mounting portion 31 may be located at the edge of the insulating member 30. The heat sink 40 may include a first contact portion and a second contact portion opposite to the first contact portion. The first contact portion includes a first surface 41. The second contact portion includes a second surface 42. The mounting portion 31 may be two opposite side surfaces 43 of the insulating member 30, and the mounting portion 31 is supported between two adjacent surfaces of the first contact portion and the second contact portion. The mounting portion 31 may be connected to the heat sink 40 by a non-detachable connection such as welding or bonding, or may be connected to the heat sink 40 by a detachable connection such as a fastener connection or a snap connection.

[0094] The insulating member 30 can be used to isolate the electrical connection components in the housing 11 from the end cap 12, or can be used to isolate the electrical connection components in the housing 11 from the housing 11 to reduce the risk of short circuit.

[0095] Please refer to Figure 6 In some embodiments, the insulating member 30 is disposed between the end cap 12 and the electrode assembly 20. The first surface 41 is thermally connected to the end cap 12. In this way, heat can be transferred from the electrode assembly 20 to the heat sink 40, and then from the heat sink 40 to the end cap 12, thereby being discharged to the external environment. Because the housing 10 has a large heat dissipation area, this can effectively reduce the internal temperature of the battery cell 100, improve the heat dissipation capacity of the battery cell 100, and thus improve the performance and life of the battery cell 100.

[0096] In some embodiments, the insulating member 30 is disposed between the housing body 11 and the electrode assembly 20. The first surface 41 is thermally connected to the housing body 11. Thus, heat can be transferred from the electrode assembly 20 to the heat sink 40, and then from the heat sink 40 to the housing body 11, and then dissipated to the external environment. Since the outer shell 10 has a large heat dissipation area, this can effectively reduce the internal temperature of the battery cell 100, improve the heat dissipation ability of the battery cell 100, and thus improve the performance and lifespan of the battery cell 100.

[0097] The electrode assembly 20 is a component in the battery cell 100 where electrochemical reactions occur. One or more electrode assemblies 20 may be included within the outer shell 10. The electrode assembly 20 may be formed by winding or laminating a positive electrode sheet and a negative electrode sheet, and generally a separator is provided between the positive electrode sheet and the negative electrode sheet.

[0098] The heat sink 40 can be used to transfer heat. The heat sink 40 can be made of materials with high thermal conductivity and good insulation properties, such as insulating ceramic materials like boron nitride and aluminum nitride, or graphene, thermally conductive plastics, etc. The shape of the heat sink 40 can be regular shapes such as plate-shaped, block-shaped, column-shaped, or irregular shapes. The first surface 41 and the second surface 42 can be two relatively large outer surfaces on the heat sink 40. For example, for a cuboid plate-shaped heat sink 40, the first surface 41 and the second surface 42 can be two relatively large and oppositely arranged surfaces on the cuboid.

[0099] When the entire first surface 41 is thermally connected to the outer shell 10 and when the entire second surface 42 is thermally connected to the electrode assembly 20, the heat sink 40 and the outer shell 10 and the electrode assembly 20 can have the largest heat dissipation area, and thus can have a better heat dissipation effect.

[0100] It should be noted that the first surface 41 can be entirely or partially thermally connected to the outer shell 10. The second surface 42 can be entirely or partially thermally connected to the electrode assembly 20. Herein, thermal connection means that heat can be transferred between two components. For example, heat can be transferred between the heat sink 40 and the outer shell 10, or between the heat sink 40 and the electrode assembly 20.

[0101] In the battery cell 100 according to the embodiment of the present application, the first surface 41 is thermally connected to the outer shell 10, and the second surface 42 is thermally connected to the electrode assembly 20. This enables the heat generated by the electrode assembly 20 during the electrochemical reaction process to be transferred to the heat sink 40, and further dissipated to the external environment through the outer shell 10. Since the outer shell 10 has a large heat dissipation area, this can effectively reduce the internal temperature of the battery cell 100, improve the heat dissipation ability of the battery cell 100, and thus improve the performance and lifespan of the battery cell 100.

[0102] In some embodiments, the electrode assembly 20 includes tab 21. The tab 21 is disposed on one side of the electrode assembly 20 close to the insulating member 30. The second surface 42 is thermally connected to the tab 21.

[0103] Specifically, the portions of the positive electrode sheet and the negative electrode sheet having the active material constitute the main body of the electrode assembly 20, and the portions of the positive electrode sheet and the negative electrode sheet without the active material respectively constitute the tab 21. The tab 21 can be divided into a positive tab 21 and a negative tab 21. The positive tab 21 and the negative tab 21 can be located at one end of the main body together, or can be located at both ends of the main body respectively. The heat generated by the electrochemical reaction of the electrode assembly 20 can be output through the tab 21.

[0104] Thus, by disposing the tab 21 on one side of the electrode assembly 20 close to the insulating member 30 and thermally connecting it to the second surface 42 of the heat sink 40, a heat conduction path from the tab 21 to the heat sink 40 is formed, so that the heat on the tab 21 can be transferred to the heat sink 40 and further dissipated to the external environment through the outer casing 10. Since the outer casing 10 has a large heat dissipation area, this can effectively reduce the internal temperature of the battery cell 100, improve the heat dissipation capacity of the battery cell 100, and thus improve the performance and lifespan of the battery cell 100.

[0105] In some embodiments, the battery cell 100 further includes a terminal post 60. The terminal post 60 penetrates through the insulating member 30 and the outer casing 10, and the second surface 42 is thermally connected to the terminal post 60.

[0106] Specifically, the terminal post 60 can be used for electrically connecting to the structures outside the electrode assembly 20 and the battery cell 100 to output or input the electric energy of the battery cell 100. The terminal post 60 can be made of a material with good thermal conductivity, such as copper, aluminum or other metal alloys. In the same battery cell 100, terminal posts 60 made of different materials can be adopted. For example, the battery cell 100 includes copper terminal posts and aluminum terminal posts arranged at intervals to adapt to the output of the negative electrode and the positive electrode of the battery cell 100.

[0107] During the charging and discharging process of the battery cell 100, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab 21 is connected to the terminal post 60 to form a current loop. Therefore, the terminal post 60 can conduct the heat at the tab 21 to the external environment.

[0108] Thus, as a component connecting the external circuit of the battery cell 100, the terminal post 60 is thermally connected to the second surface 42 of the heat sink 40, and can effectively conduct the heat to the external environment, thereby improving the heat dissipation efficiency.

[0109] Please refer to Figure 6, in some embodiments, the electrode assembly 20 includes a tab 21. The tab 21 is disposed on the side of the electrode assembly 20 close to the insulating member 30. The battery cell 100 further includes a transfer structure 70. The transfer structure 70 is disposed between the tab 21 and the second surface 42, and the transfer structure 70 is thermally connected to both the tab 21 and the second surface 42.

[0110] Specifically, the transfer structure 70 can be a transfer sheet, a transfer block, etc. The transfer structure 70 can be used to achieve the electrical connection between the tab 21 of the battery cell 100 and the terminal 60. The transfer structure 70 can make the current distribution between the tab 21 and the terminal 60 more uniform, reducing local overheating or material fatigue caused by current concentration. The transfer structure 70 can serve as an intermediary for force transmission, reducing the mechanical stress that may occur when the tab 21 and the terminal 60 are directly connected and reducing the risk of fracture at the connection point. The transfer structure 70 can be thermally connected to the tab 21 and the heat sink 40 by welding or using adhesives, etc.

[0111] Thus, the transfer structure 70 is disposed between the tab 21 and the second surface 42 of the heat sink 40, providing an additional heat conduction channel, which helps to more effectively transfer the heat generated by the tab 21 to the heat sink 40. In addition, the transfer structure 70 helps to more evenly disperse the heat generated by the tab 21, avoiding excessive heat concentration at the tab 21, thereby improving the heat dissipation uniformity of the entire battery cell 100.

[0112] Please refer to Figure 8 , Figure 8 is a schematic structural diagram of the battery cell 100 provided by some other embodiments of the present application. In some embodiments, the transfer structure 70 is welded to the tab 21 and a welding area 71 is formed. The orthographic projection of the welding area 71 on the second surface 42 is located within the second surface 42.

[0113] Specifically, the welding area 71 can use welding materials that match the materials of the transfer structure 70 and the tab 21, such as copper solder, silver solder or other metal solders. The welding process can be laser welding, ultrasonic welding, etc. to adapt to different tab 21 materials and shapes.

[0114] Thus, the setting of the welding area 71 enhances the mechanical connection strength between the transfer structure 70 and the tab 21. During the use of the battery cell 100, even under conditions such as vibration or impact, the stability of the connection between the transfer structure 70 and the tab 21 can be maintained. The transfer structure 70 can be used to transmit the current output on the tab 21. The welding area 71 serves as a current channel, so the heat of the welding area 71 is relatively high. The orthographic projection of the welding area 71 on the second surface 42 is located within the second surface 42, enabling the heat on the transfer structure 70 to be effectively transferred to the heat sink 40.

[0115] Please refer toFigure 9 , Figure 9 : is a structural schematic diagram of a battery cell 100 provided in some further embodiments of the present application. In some embodiments, the battery cell 100 further includes a pole 60. The pole 60 includes a column 61 and a heat-conducting portion 62. The heat-conducting portion 62 is arranged on a side of the column 61 close to the electrode assembly 20. The column 61 passes through the insulating member 30 and the outer shell 10. The transition structure 70 includes a first connecting portion 72 and a second connecting portion 73 connected to the first connecting portion 72. The first connecting portion 72 is thermally connected to the heat-conducting portion 62. The second connecting portion 73 is thermally connected to the second surface 42, and the orthographic projection of the second connecting portion 73 on the second surface 42 is located within the second surface 42.

[0116] Specifically, both the column 61 and the heat-conducting portion 62 can be made of copper, aluminum, or other materials with good thermal and electrical conductivity. The orthographic projection of the column 61 on the surface of the heat-conducting portion 62 close to the column 61 can be located within the above-mentioned surface, which facilitates the connection between the heat-conducting portion 62 and the first connecting portion 72. The first connecting portion 72 can be located between the heat-conducting portion 62 and the tab 21. The first connecting portion 72 and the heat-conducting portion 62 can be thermally connected by welding, bonding, etc. The first connecting portion 72 and the tab 21 can also be thermally connected by welding, bonding, etc.

[0117] The first connecting portion 72 and the second connecting portion 73 can be integrally formed, for example, they can be a single sheet metal formed by stamping. Alternatively, they can be split into separate pieces, for example, they can be two sheet metal parts welded together. The first connecting portion 72 and the second connecting portion 73 can be coplanar or staggered in the thickness direction of the adapter structure 70. This facilitates the connection between the adapter structure 70 and the tab 21, the terminal post 60, and the heat sink 40, thereby optimizing the internal spatial layout of the battery cell 100 and improving the internal space utilization of the battery cell 100.

[0118] Please refer to Figure 6 and Figure 7 The pole 60 may further include a limiting portion 63 and an insulating assembly 64. Both the limiting portion 63 and the insulating assembly 64 may be sleeved on the column 61. The insulating assembly 64 may be arranged between the shell 10 and the limiting portion 63. The limiting portion 63 and the insulating assembly 64 may be fixed by riveting. The insulating assembly 64 may be fixed to the surface of the shell 10 facing away from the electrode assembly 20. Both the limiting portion 63 and the insulating assembly 64 may be used to limit the position of the column 61, and the insulating assembly 64 may be used to insulate and isolate the limiting portion 63 and the shell 10 to prevent the current on the column 61 from reaching the shell 10 through the limiting portion 63.

[0119] Thus, the transition structure 70 includes a first connection portion 72 and a second connection portion 73. The first connection portion 72 is thermally connected to the heat conducting portion 62, and the second connection portion 73 is thermally connected to the second surface 42. This forms at least two independent heat dissipation paths, allowing heat from the electrode assembly 20 to be transferred to the external environment through the electrode column 60, or through the heat sink 40 and the housing 10, thereby improving heat dissipation efficiency. The orthographic projection of the second connection portion 73 on the second surface 42 is located within the second surface 42, which provides a larger contact area between the second connection portion 73 and the heat sink 40, allowing heat from the second connection portion 73 to be effectively transferred to the heat sink 40.

[0120] Please refer to Figure 6 In some embodiments, the battery cell 100 further includes a seal 80. The seal 80 is located between the housing 10 and the column 61. The seal 80 is sleeved on the column 61. The minimum distance D between the seal 80 and the heat sink 40 is greater than or equal to 2 mm.

[0121] Specifically, the seal 80 is a component used to insulate and isolate the cylinder 61 from the housing 10, and to seal the gap between the cylinder 61 and the housing 10. The seal 80 can be spaced apart from the insulating assembly 64 and installed at different locations on the cylinder 61. The seal 80 can be made of rubber, silicone, or other polymers. The seal 80 can be an O-ring, a rectangular seal, or a special shape to accommodate the structure of the cylinder 61 and the housing 10.

[0122] In this way, the seal 80 is located between the housing 10 and the column 61 and is sleeved on the column 61, which helps to electrically insulate the pole 60 from the housing 10 of the battery cell 100 and reduce the probability of electrical short circuit or leakage.

[0123] When the minimum distance D between the seal 80 and the heat sink 40 is greater than or equal to 2 mm, the heat sink 40 has less impact on the seal 80. This reduces the probability of overheating of the seal 80 due to close contact with the heat sink 40, thereby extending the service life of the seal 80 and maintaining its performance. Furthermore, this reduces the risk of seal 80 aging and damage due to high temperatures, thereby reducing potential safety risks such as electrical short circuits or leakage.

[0124] Please refer to Figure 10 , Figure 10 yes Figure 5 An enlarged view of portion B of the battery cell 100. In some embodiments, the mounting portion 31 includes a mounting groove 310. The mounting groove 310 includes a bottom wall 311 and a side wall 312 connected at an angle. The heat sink 40 also includes a side surface 43 connecting the first surface 41 and the second surface 42. The side surface 43 includes a first region 430 and a second region 431 connected at an angle. The first region 430 contacts the bottom wall 311, and the second region 431 contacts the side wall 312.

[0125] Specifically, the installation groove 310 may be a through groove formed in the insulating member 30. The angle between the bottom wall 311 and the side wall 312 may be an acute angle, a right angle, or an obtuse angle. The angle between the first region 430 and the second region 431 may be the same as the angle between the bottom wall 311 and the side wall 312 to facilitate the cooperation between the heat dissipation member 40 and the installation groove 310. The heat dissipation member 40 may be directly placed on the bottom wall 311, and the bottom wall 311 and the side wall 312 may cooperate with the housing 10 to limit all degrees of freedom of the heat dissipation member 40, thereby realizing the fixation of the heat dissipation member 40.

[0126] In this way, since the connection between the heat dissipation member 40 and the installation portion 31 is achieved only by the surface limitation of the groove wall of the installation groove 310 and the heat dissipation member 40 itself, specifically, by the contact between the groove wall of the installation groove 310 and the side surface 43 of the heat dissipation member 40, a stable connection relationship is formed, and no additional fasteners are required to prevent the displacement or rotation of the heat dissipation member 40. This saves additional components and complex fasteners, simplifies the manufacturing process, and thus reduces the material and manufacturing costs.

[0127] Please refer to Figures 11 to 14 , Figure 11 which is a schematic structural view of the heat dissipation member 40 provided by some embodiments of the present application; Figure 12 which is a partial schematic structural view of the battery cell 100 provided by some embodiments of the present application; Figure 13 is Figure 12 a cross-sectional view of the battery cell 100 in the B-B direction of Figure 14 is Figure 13 an enlarged view of part C of the battery cell 100 of . In some embodiments, the installation portion 31 includes an installation groove 310. The insulating member 30 includes a body 32 and a first clamping portion 33 connected to the body 32. The heat dissipation member 40 is disposed in the installation groove 310, and the heat dissipation member 40 includes a first portion 44 and a second portion 45 stacked. A second clamping portion 46 is formed between the first portion 44 and the second portion 45. The first clamping portion 33 is clamped with the second clamping portion 46.

[0128] Specifically, the installation groove 310 may be a through groove formed in the body 32. The first clamping portion 33 and the second clamping portion 46 may be two parts with complementary geometric shapes, such as a groove and a protrusion. The first portion 44 may be disposed close to the housing 10. The second portion 45 may be disposed close to the electrode assembly 20.

[0129] In this way, the clamping structure improves the stability and retention force of the overall structure of the heat dissipation member 40 and the insulating member 30, and reduces the displacement or vibration of the heat dissipation member 40 and the insulating member 30 during transportation or use. The clamping structure reduces potential errors during the assembly process, improves the manufacturing efficiency of the battery cell 100, and improves the reliability of the battery cell 100.

[0130] Please refer to Figure 14 , in some embodiments, one of the first engaging portion 33 and the second engaging portion 46 is a locking block 101, and the other is a locking hole 102. Among them, Figure 14 illustrates the case where the first engaging portion 33 is the locking block 101 and the second engaging portion 46 is the locking hole 102.

[0131] Specifically, the cross-sectional shape of the locking block 101 can be a regular shape such as a rectangle, a circle, an ellipse, etc., or an irregular shape. The shape of the locking hole 102 can be adapted to the shape of the locking block 101. The first engaging portion 33 can be a locking block 101 protruding from one side of the body 32. The second engaging portion 46 can be a locking hole 102 formed between the first part 44 and the second part 45. The body 32 and the first engaging portion 33 can also be integrally formed, for example, the body 32 and the first engaging portion 33 can be two sheet metals spliced by welding.

[0132] The first engaging portion 33 can also be a locking hole 102 recessed in the body 32, and the second engaging portion 46 can also be a locking block 101 between the first part 44 and the second part 45. The body 32 and the first engaging portion 33 can be integrally formed, for example, the body 32 and the first engaging portion 33 can be formed from a single sheet metal by machining.

[0133] In this way, the design of the locking block 101 and the locking hole 102 simplifies the assembly process and reduces the assembly complexity.

[0134] Please refer to Figure 15 、 Figure 16 and Figure 17 , Figure 15 is a schematic structural diagram of the heat sink 40 provided by other embodiments of the present application; Figure 16 is Figure 12 a cross-sectional view of the battery cell 100 in the B-B direction; Figure 17 is Figure 16 an enlarged view of part D of the battery cell 100. In some embodiments, the heat sink 40 is provided with a first welding portion 47. The first welding portion 47 is recessed in the heat sink 40 along the direction E close to the electrode assembly 20. The housing 10 is provided with a second welding portion 13. The second welding portion 13 is recessed in the housing 10 along the direction F away from the electrode assembly 20. The first welding portion 47 and the second welding portion 13 are arranged opposite to each other. The insulating member 30 is provided with a third welding portion 34. The third welding portion 34 is welded to both the first welding portion 47 and the second welding portion 13.

[0135] Specifically, the first welding portion 47, the second welding portion 13, and the third welding portion 34 are parts for welding. One or more welding spots can be provided on the welding portions. The welding portions can be in the shape of a plane, a protrusion, a groove, etc., so as to facilitate the welding operation. The recessed depth of the first welding portion 47 can be less than the thickness of the heat sink 40. The recessed depth of the second welding portion 13 can be less than the thickness of the housing 10. This can prevent the heat sink 40 or the housing 10 from being welded through during welding, thereby ensuring the reliability of the battery cell 100.

[0136] In this way, the design of the recessed welding portion and the relative arrangement of the first welding portion 47 and the second welding portion 13 contribute to the accurate alignment during the welding process, thereby improving the positioning accuracy among the insulating member 30, the heat sink 40, and the housing 10, and thus enhancing the overall assembly quality of the insulating member 30, the heat sink 40, and the housing 10. A stable connection is formed through welding, reducing the risk of separation of the insulating member 30, the heat sink 40, and the housing 10 during transportation or use.

[0137] Please refer to Figure 17 , in some embodiments, the first welding portion 47 is provided with a first connection hole 470 and a second connection hole 471 communicating with the first connection hole 470. The aperture K1 of the first connection hole 470 is smaller than the aperture K2 of the second connection hole 471. The second welding portion 13 includes a third connection hole 130 and a fourth connection hole 131 communicating with the third connection hole 130. The aperture K3 of the third connection hole 130 is smaller than the aperture K4 of the fourth connection hole 131.

[0138] The third welding portion 34 includes a main body portion 340 and a first extension portion 341 and a second extension portion 342 connected to opposite ends of the main body portion 340. The main body portion 340 passes through the first connection hole 470 and the third connection hole 130, and the main body portion 340 is welded to both the first welding portion 47 and the second welding portion 13. The first extension portion 341 cooperates with the second connection hole 471. The second extension portion 342 cooperates with the fourth connection hole 131.

[0139] Specifically, the second connection hole 471 can be closer to the electrode assembly 20 relative to the first connection hole 470. The third connection hole 130 can be closer to the heat sink 40 relative to the fourth connection hole 131. The main body portion 340 can be the main contour shape part of the third welding portion 34.

[0140] The first extension part 341 can be connected to both sides of the main body part 340. The first extension part 341 can be welded to the first welding part 47. The first extension part 341 can be spaced from the second extension part 342. The second extension part 342 can also be connected to both sides of the main body part 340. The second extension part 342 can be welded to the second welding part 13. The first extension part 341 and the second extension part 342 can be symmetrically arranged with respect to the main body part 340 so that the main body part 340 is evenly stressed during welding or use, improving the service life of the insulating part 30.

[0141] The main body part 340 and the first extension part 341, and the main body part 340 and the second extension part 342 can be an integrally formed structure. For example, the main body part 340 and the first extension part 341 can be formed from a single base material by machining. The main body part 340 and the second extension part 342 can be formed by injection molding. The main body part 340 and the first extension part 341, and the main body part 340 and the second extension part 342 can also be a separately formed structure. For example, the main body part 340 and the first extension part 341 can be formed by welding and splicing two base materials; the main body part 340 and the second extension part 342 can be formed by bonding and splicing two base materials. Among them, the base material can be a plastic block.

[0142] In this way, the first welding part 47 and the second welding part 13 include two sets of connection holes with different apertures, and the welded connection of the main body part 340 of the third welding part 34 forms a more stable welding structure. This significantly improves the connection stability between the housing 10, the heat sink 40 and the insulating part 30. The cooperation between the first extension part 341 and the second connection hole 471, and the cooperation between the second extension part 342 and the fourth connection hole 131 provide mechanical double locking, further enhancing the mechanical strength and anti-deformation ability of the overall structure of the housing 10, the heat sink 40 and the insulating part 30.

[0143] Please refer to Figure 7 , in some embodiments, the number of the mounting parts 31 and the heat sinks 40 is multiple, and the mounting parts 31 and the heat sinks 40 correspond to each other one by one.

[0144] Specifically, the number of the mounting parts 31 can be two, three, four or even more. The number of the heat sinks 40 is the same as the number of the mounting parts 31. For example, the number of the mounting parts 31 is two, and the two mounting parts 31 are arranged at intervals along the length direction or the width direction of the insulating part 30. The number of the heat sinks 40 is two, and the two heat sinks 40 are respectively connected to the two mounting parts 31.

[0145] In this way, the heat sink 40 can provide heat dissipation functions in multiple areas, enabling heat to be transferred to the housing 10 through multiple different paths, thereby improving the overall heat dissipation efficiency of the battery cell 100.

[0146] Please refer toFigure 6 In a specific embodiment, the battery cell 100 includes a housing 10, an electrode assembly 20, an insulating member 30, and a heat dissipation member 40. The electrode assembly 20 is received in the housing 10. The insulating member 30 is disposed between the housing 10 and the electrode assembly 20, and the insulating member 30 is provided with a mounting portion 31. The heat dissipation member 40 is connected to the mounting portion 31. The heat dissipation member 40 includes a first surface 41 and a second surface 42 facing away from each other. The first surface 41 is thermally connected to the housing 10. The second surface 42 is thermally connected to the electrode assembly 20.

[0147] The housing 10 may include a housing body 11 and an end cap 12. The housing body 11 is provided with an opening 110. The end cap 12 is connected to the housing body 11 and covers the opening 110. The insulating member 30 is disposed between the end cap 12 and the electrode assembly 20.

[0148] Please refer to Figure 8 , the electrode assembly 20 includes a tab 21. The tab 21 is disposed on a side of the electrode assembly 20 close to the insulating member 30. The battery cell 100 further includes a transfer structure 70. The transfer structure 70 is disposed between the tab 21 and the second surface 42, and the transfer structure 70 is thermally connected to both the tab 21 and the second surface 42. The transfer structure 70 is welded to the tab 21 and a welding area 71 is formed. The orthographic projection of the welding area 71 on the second surface 42 is located within the second surface 42.

[0149] Please refer to Figure 9 , the battery cell 100 further includes a terminal 60. The terminal 60 includes a column body 61 and a heat conducting portion 62. The heat conducting portion 62 is disposed on a side of the column body 61 close to the electrode assembly 20. The column body 61 passes through the insulating member 30 and the housing 10. The transfer structure 70 includes a first connecting portion 72 and a second connecting portion 73 connected to the first connecting portion 72. The first connecting portion 72 is thermally connected to the heat conducting portion 62. The second connecting portion 73 is thermally connected to the second surface 42, and the orthographic projection of the second connecting portion 73 on the second surface 42 is located within the second surface 42. The battery cell 100 further includes a sealing member 80. The sealing member 80 is located between the housing 10 and the column body 61. The sealing member 80 is sleeved on the column body 61, and the minimum distance between the sealing member 80 and the heat dissipation member 40 is 3 mm.

[0150] Please refer to Figure 7 , two mounting grooves 310 are provided on the end cap 12, and the two mounting grooves 310 are arranged at intervals along the length direction of the insulating member 30. Heat dissipation members 40 are provided in both of the two mounting grooves 310. The mounting groove 310 includes a bottom wall 311 and a side wall 312 perpendicular to each other. The heat dissipation member 40 further includes a side surface 43 connecting the first surface 41 and the second surface 42. The side surface 43 includes a first region 430 and a second region 431 perpendicular to each other. The first region 430 contacts the bottom wall 311. The second region 431 contacts the side wall 312.

[0151] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered within the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, The battery cell includes: a housing; an electrode assembly accommodated in the housing; an insulating member disposed between the housing and the electrode assembly, and the insulating member is provided with a mounting portion; a heat dissipation member connected to the mounting portion, the heat dissipation member includes a first surface and a second surface facing away from each other, the first surface is thermally connected to the housing, and the second surface is thermally connected to the electrode assembly.

2. The battery cell according to claim 1, characterized in that, The electrode assembly includes a tab, the tab is disposed on a side of the electrode assembly close to the insulating member, and the second surface is thermally connected to the tab.

3. The battery cell according to claim 1, wherein The battery cell further includes a terminal post, the terminal post penetrates through the insulating member and the housing, and the second surface is thermally connected to the terminal post.

4. The battery cell according to claim 1, characterized in that, The electrode assembly includes a tab, the tab is disposed on a side of the electrode assembly close to the insulating member, the battery cell further includes a transfer structure disposed between the tab and the second surface, and the transfer structure is thermally connected to both the tab and the second surface.

5. The battery cell according to claim 4, characterized in that, The transfer structure is welded to the tab and forms a welding zone, and a positive projection of the welding zone on the second surface is located within the second surface.

6. The battery cell according to claim 4, wherein The battery cell further includes a terminal post, the terminal post includes a column body and a heat conducting portion, the heat conducting portion is disposed on a side of the column body close to the electrode assembly, the column body penetrates through the insulating member and the housing, the transfer structure includes a first connecting portion and a second connecting portion connected to the first connecting portion, the first connecting portion is thermally connected to the heat conducting portion, the second connecting portion is thermally connected to the second surface, and a positive projection of the second connecting portion on the second surface is located within the second surface.

7. The battery cell according to claim 6, wherein The battery cell further includes a sealing member located between the housing and the column body, the sealing member is sleeved on the column body, and a minimum distance between the sealing member and the heat dissipation member is greater than or equal to 2 mm.

8. The battery cell according to claim 1, wherein, The mounting portion includes a mounting groove, the mounting groove includes a bottom wall and a side wall connected at an angle, the heat dissipation member further includes a side surface connecting the first surface and the second surface, the side surface includes a first region and a second region connected at an angle, the first region is in contact with the bottom wall, and the second region is in contact with the side wall.

9. The battery cell according to claim 1, characterized in that, The mounting portion includes a mounting groove, the insulating member includes a main body and a first clamping portion connected to the main body, the heat dissipation member is disposed in the mounting groove, the heat dissipation member includes a first portion and a second portion stacked, and a second clamping portion is formed between the first portion and the second portion, and the first clamping portion is clamped with the second clamping portion.

10. The battery cell according to claim 9, wherein, One of the first clamping portion and the second clamping portion is a clamping block, and the other is a clamping hole.

11. The battery cell according to claim 1, characterized in that, The heat dissipation member is provided with a first welding portion recessed into the heat dissipation member in a direction close to the electrode assembly, the housing is provided with a second welding portion recessed into the housing in a direction away from the electrode assembly, the first welding portion and the second welding portion are disposed opposite to each other, and the insulating member is provided with a third welding portion welded to both the first welding portion and the second welding portion.

12. The battery cell according to claim 11, characterized in that, The first welding part is provided with a first connection hole and a second connection hole communicating with the first connection hole. The aperture of the first connection hole is smaller than that of the second connection hole. The second welding part includes a third connection hole and a fourth connection hole communicating with the third connection hole. The aperture of the third connection hole is smaller than that of the fourth connection hole; The third welding part includes a main body part and a first extension part and a second extension part connected to opposite ends of the main body part. The main body part passes through the first connection hole and the third connection hole. The main body part is welded to both the first welding part and the second welding part. The first extension part is matched with the second connection hole, and the second extension part is matched with the fourth connection hole.

13. The battery cell according to claim 1, characterized in that, The number of the mounting parts and the heat dissipation parts is multiple, and the mounting parts and the heat dissipation parts correspond to each other one by one.

14. The battery cell according to claim 1, wherein, The housing includes a housing body and an end cover. The housing body is provided with an opening. The end cover is connected to the housing body and covers the opening. The insulating member is disposed between the end cover and the electrode assembly, and the first surface is thermally connected to the end cover; Or the insulating member is disposed between the housing body and the electrode assembly, and the first surface is thermally connected to the housing body.

15. A battery, characterized in that, The battery includes the battery cell according to any one of claims 1-14.

16. An electrical device, characterized in that, The electrical device includes the battery cell according to any one of claims 1-14 or the battery according to claim 14.

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