Battery monomer, battery device and electric equipment

Abstract

The invention relates to a battery monomer, a battery device and electric equipment. The battery monomer comprises a shell, an electrode assembly, a heat-conducting insulating part and a bearing insulating part, the shell comprises a shell body and an end cover, the shell body is provided with an opening, the end cover covers the opening, an accommodating cavity is defined by the end cover and the shell body, and the end cover is provided with an electrode terminal; the electrode assembly is arranged in the accommodating cavity, the electrode assembly comprises a tab, and the tab is electrically connected with the electrode terminal; the heat-conducting insulating part is wound on the periphery of the electrode assembly and is in heat-conducting connection with the shell; the bearing insulating part comprises a bearing part, and the bearing part is arranged at the end, away from the electrode terminal, of the heat conduction insulating part and covers the electrode assembly. According to the invention, the problem that the performance and the service life of the battery monomer are adversely affected due to too high or too low internal temperature of the battery monomer can be improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to battery cells, battery devices and electrical equipment. Background Technology

[0002] Batteries are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools, etc.

[0003] However, in actual operation, excessively high or low internal temperatures of a battery cell can adversely affect its lifespan and performance. Summary of the Invention

[0004] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device that can enhance the thermal conductivity between the internal electrode components of the battery cell and the external environment, so as to balance the internal temperature of the battery cell and improve the performance and service life of the battery cell.

[0005] In a first aspect, this application proposes a battery cell, including a casing, an electrode assembly, a thermally conductive insulating member, and a supporting insulating member; the casing includes a housing and an end cap, the housing having an opening, the end cap covering the opening and defining a receiving cavity with the housing, and the end cap having electrode terminals; the electrode assembly is disposed in the receiving cavity, the electrode assembly including tabs, the tabs being electrically connected to the electrode terminals; the thermally conductive insulating member is wrapped around the outer periphery of the electrode assembly and is thermally connected to the casing; the supporting insulating member includes a supporting portion, the supporting portion being disposed at the end of the thermally conductive insulating member away from the electrode terminals, and covering the electrode assembly.

[0006] In the embodiments of this application, the battery cell includes a casing, an electrode assembly, a thermally conductive insulating component, and a supporting insulating component. The electrode assembly is located within a receiving cavity, and the casing provides containment and protection for the electrode assembly. On one hand, by providing a thermally conductive insulating component around the outer periphery of the electrode assembly, heat at the thermally conductive contact point between the electrode assembly and the thermally conductive insulating component can be conducted through the thermally conductive insulating component, improving the overall temperature uniformity of the electrode assembly. Furthermore, by making the thermally conductive insulating component thermally connected to the casing, heat from the electrode assembly can be conducted to the casing for heat dissipation, increasing the rate of heat exchange between the electrode body and the external environment, thereby balancing the internal temperature of the battery cell and mitigating the adverse effects on the performance and lifespan of the battery cell caused by excessively high or low internal temperatures. On the other hand, by providing the thermally conductive insulating component and the supporting insulating component, the process of setting an insulating sheet on the outer periphery of the electrode assembly in related technologies can be eliminated. Moreover, the insulating sheet is usually made of plastic, which has poor thermal conductivity, affecting the heat dissipation capacity of the electrode assembly. Eliminating the insulating sheet not only reduces the cost of this process but also further improves the thermal conductivity of the thermally conductive insulating component.

[0007] In some embodiments of the present application, the supporting insulating member further includes two first bent portions connected to both sides of the supporting portion. The first bent portions extend from the supporting portion toward the end cover and are connected to the end cover. The first bent portions are located between the thermally conductive insulating member and the outer shell.

[0008] In these embodiments, by providing two first bends, the electrode assembly and the thermally conductive insulation can be better fixed and limited, thereby improving the stability of the electrode assembly and the thermally conductive insulation.

[0009] In some embodiments, the battery cell further includes an insulating element disposed on the side of the end cap facing the electrode assembly, and two first bends are located on both sides of the insulating element.

[0010] In these embodiments, by covering both sides of the insulating member with two first bends, conductive contact between the electrode assembly and the housing can be further prevented.

[0011] In some embodiments, the supporting insulation member further includes two second bends disposed opposite to each other, the two first bends and the two second bends together covering the outer periphery of the insulation member; the second bends are connected to at least one of the first bends.

[0012] In these embodiments, the two first bends and the two second bends cooperate to cover the outer periphery of the insulating member, which can further improve the effect of supporting the insulating member to prevent the electrode assembly from making conductive contact with the housing.

[0013] In some embodiments, two first bends are disposed opposite each other in the length direction of the electrode assembly, and two second bends are disposed opposite each other in the thickness direction of the electrode assembly.

[0014] In these embodiments, by arranging the two first bends connected to the support and extending to both sides of the insulating member opposite each other along the length direction of the electrode assembly, the second bend does not need to be connected to the support. The length of the second bend extending along the second direction in the third direction can be shorter, thereby effectively reducing the surface area of ​​the support and exposing more of the thermally conductive insulating member while achieving the covering of the insulating member.

[0015] In some embodiments, the second bend and the support portion are spaced apart.

[0016] In these embodiments, by spacing the second bend from the support portion, more thermally conductive insulating material can be exposed, increasing the thermally conductive area of ​​the thermally conductive insulating material and improving its thermal conductivity.

[0017] In some embodiments, the thermally conductive insulating member has a connecting portion extending toward the end cap, and the connecting portion is connected to the end cap.

[0018] In these embodiments, by connecting the thermally conductive insulation directly to the end cap via the connection portion, the heat exchange capacity between the thermally conductive insulation and the housing can be further enhanced.

[0019] In some embodiments, the thermally conductive insulating member has a first opening, through which the electrode terminal is electrically connected to the tab of the electrode assembly.

[0020] In these embodiments, the thermally conductive insulator has a first opening to expose the tabs of the electrode terminals or electrode assembly, allowing the electrode terminals to be directly electrically connected to the tabs or electrically connected via a transition member.

[0021] In some embodiments, the connection includes an extension and a bend, the extension being connected between the bend and the thermally conductive insulation, and the side of the bend away from the thermally conductive insulation being connected to the side of the end cap facing the receiving cavity.

[0022] In these embodiments, by providing an extension section, the bending section can be brought closer to the end cap, and the side of the bending section away from the thermally conductive insulator can be connected to the side surface of the end cap facing the receiving cavity, thereby increasing the contact area between the bending section and the end cap and thus improving the thermal conductivity of the thermally conductive insulator.

[0023] In some embodiments, the electrode assembly includes two first sides and two second sides, the two first sides being disposed opposite each other in a first direction, the two second sides being disposed opposite each other in a second direction, the area of ​​the first sides being larger than the area of ​​the second sides, the thermally conductive insulating member including two first thermally conductive sheets disposed opposite each other in the first direction, each first thermally conductive sheet being disposed between each first side and the inner wall of the housing; at least one first thermally conductive sheet is provided with a connecting portion.

[0024] In these embodiments, two first heat-conducting sheets are arranged one-to-one with two larger first side surfaces, and both can conduct heat through the connecting part and the end cap, which helps to increase the contact area between the thermally conductive insulating component and the electrode body, thereby enhancing the heat conduction rate of the thermally conductive insulating component.

[0025] In some embodiments, the thermally conductive insulating element further includes two second thermally conductive sheets, with the two first thermally conductive sheets and the two second thermally conductive sheets alternately connected to enclose the electrode assembly.

[0026] In these embodiments, the first heat-conducting sheet is connected to the second heat-conducting sheet, so that the heat-conducting insulating component is disposed around the outer periphery of the electrode body, thereby further improving the heat conduction rate of the heat-conducting insulating component.

[0027] In some embodiments, a single battery cell includes two or more electrode assemblies and two or more thermally conductive insulating components, with each thermally conductive insulating component corresponding to one of the electrode assemblies.

[0028] In these embodiments, by setting multiple electrode assemblies within a single battery cell, the capacity of a single battery cell can be increased. Furthermore, by providing a separate thermally conductive insulating component for each battery cell, the temperature uniformity within the battery cell can be improved, increasing the rate of heat exchange between the electrode cell and the external environment. This balances the internal temperature of the battery cell and further mitigates the adverse effects on the performance and lifespan of the battery cell caused by excessively high or low internal temperatures.

[0029] In some embodiments, a gap is formed between the two ends of the thermally conductive insulating member along the periphery of the electrode assembly, the gap being located on the side of the electrode assembly corresponding to the thermally conductive insulating member facing the adjacent electrode assembly.

[0030] In these embodiments, the thermally conductive insulation is a strip wrapped around the outer periphery of the electrode assembly, forming a gap between the two ends along the periphery of the electrode assembly. This gap is located on the side between two adjacent electrode assemblies, which on the one hand allows for expansion space for the electrode assembly, and on the other hand reduces the risk of overlap between the electrode assembly and the housing.

[0031] In some embodiments, the supporting insulation element is a one-piece molded component.

[0032] In these embodiments, integral molding can improve the structural stability of the supporting insulation and facilitate the unfolding and folding of the supporting insulation, making it easier to place on the outside of the electrode assembly and the insulation.

[0033] In some embodiments, the supporting insulating element encloses a placement space, and the thermally conductive insulating element is located in the placement space.

[0034] In these embodiments, the supporting insulation is folded to form a placement space, which can enclose the thermally conductive insulation from the side within the placement space, thereby providing a good fixing effect on the thermally conductive insulation.

[0035] In some embodiments, the thermally conductive insulating component includes a thermally conductive sheet and an insulating film covering the thermally conductive sheet, wherein the thermal conductivity k of the thermally conductive sheet satisfies k≥500W / (m·K).

[0036] In these embodiments, the insulating film can serve to support and protect the heat-conducting sheet. When the thermal conductivity k of the heat-conducting sheet meets the above conditions, the heat-conducting sheet has sufficient thermal conductivity to conduct heat from the electrode body.

[0037] In some embodiments, the heat-conducting sheet is made of graphite, graphene, or carbon nanotubes.

[0038] In these embodiments, the thermal conductivity of the heat-conducting sheet is improved by using graphite, graphene, or carbon nanotube thermal conductive materials.

[0039] Secondly, this application provides a battery device comprising a battery cell according to any of the first aspects of the above embodiments.

[0040] Thirdly, this application provides an electrical device that includes a battery cell from any of the first aspects of the above-described embodiments; or includes a battery device from the second aspect of the above-described embodiments, wherein the battery device is used to provide electrical energy.

[0041] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0042] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0043] Figure 1 This is a schematic diagram of the structure of a vehicle provided in one embodiment of this application;

[0044] Figure 2 This is a schematic diagram of the structure of a battery device provided in an embodiment of this application;

[0045] Figure 3 This is a schematic diagram of the structure of a battery module provided in one embodiment of this application;

[0046] Figure 4 This is a schematic diagram of the structure of a battery cell provided in an embodiment of this application;

[0047] Figure 5 This is a three-dimensional structural diagram of a battery cell with its casing hidden, provided in an embodiment of this application;

[0048] Figure 6 This is a cross-sectional view of a battery cell provided in an embodiment of this application;

[0049] Figure 7 yes Figure 6 Enlarged view of section A;

[0050] Figure 8 This is one of the three-dimensional structural schematic diagrams of the thermally conductive insulating component in a battery cell provided in an embodiment of this application;

[0051] Figure 9 This is a three-dimensional structural diagram of the end cap and insulating component of a battery cell provided in an embodiment of this application;

[0052] Figure 10 This is a three-dimensional structural diagram of the supporting insulation component in a battery cell provided in an embodiment of this application;

[0053] Figure 11This is a schematic diagram of the unfolded structure of the supporting insulating member in a battery cell according to an embodiment of this application.

[0054] The accompanying drawings may not be drawn to scale.

[0055] Explanation of reference numerals in the attached figures:

[0056] 1000, vehicles;

[0057] 100. Battery assembly; 110. Controller; 120. Motor;

[0058] 200. Battery module;

[0059] 300. Enclosure; 301. First enclosure; 302. Second enclosure;

[0060] 10. Battery cells;

[0061] 1. Outer shell; 11. Housing; 111. Receiving cavity; 12. End cap; 121. Electrode terminal; 122. Adapter component; 13. Insulating component; 131. Clearance opening;

[0062] 2. Supporting insulating component; 20. Placement space; 21. Supporting part; 22. First bending part; 23. Second bending part;

[0063] 3. Electrode assembly; 31. Electrode body; 32. Tab;

[0064] 4. Thermally conductive insulating component; 40. Connecting part; 401. Extension section; 402. Bending section; 41. First thermally conductive sheet; 42. Second thermally conductive sheet; 43. First opening; 400. Gap ；

[0065] X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0066] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0067] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0068] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0069] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0070] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0071] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0072] In this application, "multiple" means two or more (including two).

[0073] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery device applications, market demand is also constantly increasing.

[0074] Excessive temperature differences between the inside and outside of a battery cell during use can lead to a decrease in the cell's performance and lifespan.

[0075] The reason for the above problems is that during the operation of a battery cell, the electrode assembly undergoes an electrochemical reaction and generates heat. This heat needs to be exchanged between the casing and the external environment. Due to the limited thermal conductivity of the casing, the internal temperature of the battery cell cannot be quickly conducted to the outside, causing the internal temperature to accumulate and rise. The electrode assembly is prone to lithium plating due to excessive temperature. In low-temperature environments, it is also difficult for the external environment to heat the electrode assembly, resulting in a decrease in capacity and pulse performance of the battery cell due to low temperature, thus affecting the performance of the battery cell.

[0076] Based on the above problems, this application provides a battery cell comprising a casing, an electrode assembly, a thermally conductive insulating component, and a supporting insulating component. The electrode assembly is located within a receiving cavity, and the casing provides containment and protection for the electrode assembly. On one hand, by providing a thermally conductive insulating component surrounding the electrode assembly, heat at the point of thermal contact between the electrode assembly and the thermally conductive insulating component can be conducted through the insulating component, improving the overall temperature uniformity of the electrode assembly. Furthermore, by thermally connecting the thermally conductive insulating component to the casing, heat from the electrode assembly can be conducted to the casing for heat dissipation, increasing the rate of heat exchange between the electrode body and the external environment, thereby balancing the internal temperature of the battery cell and mitigating the adverse effects on the battery cell's performance and lifespan caused by excessively high or low internal temperatures. On the other hand, by providing the thermally conductive insulating component and the supporting insulating component, the process of setting an insulating sheet around the electrode assembly in related technologies can be eliminated. Furthermore, the insulating sheet is typically made of plastic, which has poor thermal conductivity, affecting the heat dissipation capacity of the electrode assembly. Eliminating the insulating sheet not only reduces the cost of this process but also further improves the thermal conductivity of the thermally conductive insulating component.

[0077] The technical solutions described in the embodiments of this application are applicable to battery devices and electrical equipment using battery devices.

[0078] Electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical equipment.

[0079] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0080] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and this application embodiment is not limited to this. The battery cell can be cylindrical, flat, cuboid, or other shapes, and this application embodiment is not limited to this either.

[0081] The battery device mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. For example, the battery device mentioned in this application may include a battery module or a battery pack. A battery pack generally includes a housing for encapsulating one or more battery cells. The housing can prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0082] A single battery cell includes electrode components and an electrolyte. The electrode components include a positive electrode, a negative electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the positive and negative electrode components. The positive electrode includes a positive current collector and a positive active material layer, the latter coated on the surface of the current collector. The current collector includes a positive current-collecting section and a positive electrode tab connected to it. The current-collecting section is coated with the positive active material layer, while the tab is not. Taking a lithium-ion battery as an example, the positive current collector can be made of aluminum, and the positive active material layer includes the positive active material, which can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode sheet includes a negative current collector and a negative active material layer, the negative active material layer being coated on the surface of the negative current collector. The negative current collector includes a negative current collection section and a negative electrode tab connected to the negative current collection section. The negative current collection section is coated with the negative active material layer, while the negative electrode tab is not coated with the negative active material layer. The material of the negative current collector can be copper, and the negative active material layer includes negative active material, which can be carbon or silicon, etc. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc.

[0083] It should be understood that the technical solutions described in the embodiments of this application are not limited to the battery devices and electrical equipment described above, but can also be applied to all battery devices including housings and electrical equipment using battery devices. However, for the sake of brevity, the following embodiments are all illustrated using electric vehicles as examples.

[0084] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 110 and a motor 120. The controller 110 is used to control the battery to supply power to the motor 120, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0085] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0086] Figure 2A schematic diagram of the structure of a battery device according to an embodiment of this application is shown.

[0087] The battery device 100 mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells 10, which are connected in series, parallel, or mixed connections via a busbar.

[0088] In some embodiments, the battery cell assembly is typically formed by arranging a plurality of battery cells 10.

[0089] As an example, the battery cell assembly can be a battery module 200, which is formed by arranging and fixing multiple battery cells 10 into a single module. As an example, the battery module 200 can be formed by bundling multiple battery cells 10 together with cable ties.

[0090] In some embodiments, the battery device 100 may be a battery pack, which includes a housing 300 and one or more battery cell assemblies housed in the housing 300.

[0091] As an example, the battery cell assembly can be a battery module 200, which can be housed in the housing 300 by fixing the battery module 200 in the housing 300.

[0092] As an example, the battery cell assembly can also be housed in the housing 300 by directly fixing multiple battery cells 10 to the housing 300.

[0093] As an example, the housing 300 may include a first housing 301 and a second housing 302. The first housing 301 and the second housing 302 are fastened together to form a closed space inside the housing 300 to house the battery cell assembly. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first housing 301 may be a top cover or a bottom plate.

[0094] As an example, the housing 300 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that the interior of the housing 300 forms an enclosed space to accommodate the battery cell assembly.

[0095] In some embodiments, the housing 300 may be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 300 may be at least a portion of the floor of the vehicle 1000, or a portion of the housing 300 may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000.

[0096] Figure 3 A schematic diagram of the structure of a battery module according to an embodiment of this application is shown.

[0097] In some embodiments, such as Figure 2 and Figure 3 As shown, there are multiple battery cells 10. These multiple battery cells 10 are first connected in series, parallel, or in a mixed manner to form a battery module 200. The multiple battery modules 200 are then connected in series, parallel, or in a mixed manner to form a whole, which is housed in the casing 300.

[0098] Multiple battery cells 10 in the battery module 200 can be electrically connected through a busbar component to achieve parallel, series, or mixed connection of multiple battery cells 10 in the battery module 200.

[0099] In this application, the battery cell 10 may include lithium-ion battery cells, sodium-ion battery cells, or magnesium-ion battery cells, etc., and the embodiments of this application are not limited to this.

[0100] A battery cell 10 refers to the smallest unit that makes up a battery. A battery cell 10 includes a housing 11, an end cap 12, and an electrode assembly 3.

[0101] Electrode assembly 3 is the component in the battery cell 10 where electrochemical reactions occur. The casing 11 may contain one or more electrode assemblies 3. The electrode assembly 3 is mainly formed by winding or stacking electrode sheets, which are divided into positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the electrode body 31, while the portions of the positive and negative electrode sheets without active material each constitute a tab 32. The positive and negative tabs can be located together at one end of the electrode body 31 or separately at both ends of the electrode body 31. During the charging and discharging process of the battery cell 10, the positive and negative active materials react with the electrolyte, and the tabs 32 connect to the electrode terminals 121 to form a current loop.

[0102] The electrode assembly 3 can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0103] In some embodiments, electrode assembly 3 is a wound structure. The positive electrode and negative electrode are wound into a wound structure.

[0104] In some embodiments, the electrode assembly 3 is a stacked structure. As an example, multiple positive and negative electrodes can be provided, with multiple positive and multiple negative electrodes stacked alternately. Multiple spacers can be provided and respectively provided between any adjacent positive or negative electrodes. Alternatively, the spacers can be provided continuously and provided between any adjacent positive or negative electrodes by folding.

[0105] In some embodiments, the electrode assembly 3 may be cylindrical, flat, or polygonal, etc.

[0106] In some embodiments, the electrode assembly 3 is provided with tabs 32, which can conduct current from the electrode assembly 3. The tabs 32 include a positive tab and a negative tab.

[0107] The battery cell 10 may include a housing 11. The housing 11 is an assembly that mates with the end cap 12 to form an internal environment for the battery cell 10, wherein the formed internal environment can accommodate the electrode assembly 3, electrolyte (not shown in the figure), and other components. The housing 11 can be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite housing 11), or aluminum-plastic film, etc. In some embodiments, the housing 11 can be a sealed structure or a non-sealed structure. As an example, when the housing 11 is a non-sealed structure, the housing 11 serves to protect the electrode assembly 3, and other sealing structures are also included between the housing 11 and the electrode assembly 3 to encapsulate the electrode assembly 3 and the electrolyte. When the housing 11 is a sealed structure, it can be used to directly encapsulate the electrode assembly 3 and electrolyte, etc.

[0108] As an example, the battery cell 10 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0109] The housing 11 and the end cap 12 can be independent components. One or more openings can be provided on the housing 11, and one or more end caps 12 can close the openings to form the internal environment of the battery cell 10. Optionally, the end cap 12 and the housing 11 can also be integrated. Optionally, the end cap 12 and the housing 11 can form a common connection surface before other components are inserted into the housing, and the end cap 12 closes the housing 11 when it is necessary to encapsulate the interior of the housing 11.

[0110] In some embodiments, the electrode terminal 121 can be disposed on the end cap 12 or on the housing 11, and the electrode terminal 121 is electrically connected to the tab 32. The electrode terminal 121 can be directly connected to the tab 32, or it can be indirectly connected to the tab 32 through the adapter 122.

[0111] Please see Figures 4 to 7 , Figure 4 This is a schematic diagram of the structure of a battery cell provided in an embodiment of this application; Figure 5 This is a three-dimensional structural diagram of a battery cell with its casing hidden, provided in an embodiment of this application;

[0112] Figure 6 This is a cross-sectional view of a battery cell provided in an embodiment of this application; Figure 7 yes Figure 6 Enlarged view of section A.

[0113] Reference Figures 4 to 7 In a first aspect, this application proposes a battery cell 10, which includes a housing 1, an electrode assembly 3, a thermally conductive insulating member 4, and a supporting insulating member 2. The housing 1 includes a shell 11 and an end cap 12. The shell 11 has an opening, and the end cap 12 covers the opening and defines a receiving cavity 111 with the shell 11. The end cap 12 is provided with an electrode terminal 121. The electrode assembly 3 is disposed in the receiving cavity 111 and includes a tab 32, which is electrically connected to the electrode terminal 121. The thermally conductive insulating member 4 is wrapped around the outer periphery of the electrode assembly 3 and is thermally connected to the housing 1. The supporting insulating member 2 includes a supporting portion 21, which is disposed at the end of the thermally conductive insulating member 4 away from the electrode terminal 121 and covers the electrode assembly 3.

[0114] The thermally conductive insulating component 4 is a component with good heat conduction capacity. The thermally conductive insulating component 4 is arranged around the outer periphery of the electrode assembly 3. This can be understood as follows: the electrode assembly 3 includes two opposing end faces and a side surface connecting the two end faces, with one end face facing the end cap 12. The thermally conductive insulating component 4 is arranged at least around the side surface of the electrode assembly 3. The thermally conductive insulating component 4 can conduct heat from the electrode assembly 3. This can be achieved by directly attaching or abutting the side surface of the electrode assembly 3; or by having the thermally conductive insulating component 4 be a plating layer disposed on the side surface; or by having the thermally conductive insulating component 4 and the side surface spaced apart, with the thermally conductive insulating component 4 connected to the side surface via a thermally conductive medium, which can be air, metal, or thermally conductive adhesive, etc.

[0115] The thermally conductive insulating component 4 is thermally connected to the outer shell 1, which can be understood as: the thermally conductive insulating component 4 is directly attached to or abuts against the outer shell 1; or the thermally conductive insulating component 4 and the outer shell 1 are spaced apart, and the thermally conductive insulating component 4 is connected to the outer shell 1 through a thermally conductive medium, which can be air, metal, or thermally conductive adhesive, etc.

[0116] The supporting insulating component 2 has poor conductivity or insulation properties. The supporting part 21 is disposed at the end of the thermally conductive insulating component 4 away from the electrode terminal 121. On the one hand, it can support the electrode assembly 3, and on the other hand, it can cooperate with the thermally conductive insulating component 4 to ensure that the electrode body 31 of the electrode assembly 3 is insulated from the outer shell 1. Except for the electrode tab 32, which needs to be connected to the electrode terminal 121, the combination of the thermally conductive insulating component 4 and the supporting part 21 can effectively reduce the risk of the electrode assembly 3 conducting electricity and short-circuiting through the outer shell 1.

[0117] In the embodiment of this application, the battery cell 10 includes a shell 1, an electrode assembly 3, a thermally conductive insulating component 4, and a supporting insulating component 2. The electrode assembly 3 is located in the receiving cavity 111, and the shell 1 provides a receiving and protective function for the electrode assembly 3. On the one hand, by setting the thermally conductive insulating element 4 around the outer periphery of the electrode assembly 3, the heat at the thermally conductive contact point between the electrode assembly 3 and the thermally conductive insulating element 4 can be conducted through the thermally conductive insulating element 4, improving the overall temperature uniformity of the electrode assembly 3. Furthermore, by making the thermally conductive insulating element 4 thermally connected to the outer shell 1, the heat of the electrode assembly 3 can be conducted to the outer shell 1 for heat dissipation through the thermally conductive insulating element 4, thereby increasing the rate of heat exchange between the electrode body 31 and the external environment, balancing the internal temperature of the battery cell 10, and mitigating the problem of adverse effects on the performance and service life of the battery cell 10 due to excessively high or low internal temperatures. On the other hand, after setting the thermally conductive insulating element 4 and the supporting insulating element 2, the process of setting an insulating sheet on the outer periphery of the electrode assembly 3 in related technologies can be eliminated. Moreover, the insulating sheet is usually made of plastic, which has poor thermal conductivity and affects the heat dissipation capacity of the electrode assembly 3. Eliminating the insulating sheet can not only reduce the cost of the process, but also further improve the thermal conductivity of the thermally conductive insulating element 4.

[0118] The thermally conductive insulating component 4 includes a material with good thermal conductivity and an insulating material. It can be formed by one type of material or a composite of multiple materials, so that the thermally conductive insulating component 4 can achieve thermal conductivity and insulation between the electrode assembly 3 and the outer shell 1 by covering the electrode assembly 3.

[0119] During the operation of the battery cell 10, the heat generated by the electrode assembly 3 can be transferred to the external environment through the thermally conductive insulation component 4, which can improve the problem of the electrode assembly 3 being damaged due to excessive temperature; or in a low-temperature environment, the thermally conductive insulation component 4 can conduct external heat to the electrode assembly 3 to heat the electrode assembly 3.

[0120] Reference Figure 5 In some embodiments, the supporting insulating member 2 further includes two first bending portions 22 connected to both sides of the supporting portion 21. The first bending portions 22 extend from the supporting portion 21 toward the end cap 12 and are connected to the end cap 12. The first bending portions 22 are located between the thermally conductive insulating member 4 and the outer shell 1.

[0121] The two first bending portions 22 can be spaced apart along the first direction X or along the second direction Y. The first bending portions 22 extend from the support portion 21 toward the electrode terminal 121 along the third direction Z. The first bending portions 22 can limit and fix the thermally conductive insulating member 4 and the electrode assembly 3 on the side, so that the electrode assembly 3 and the end cap 12 can be connected to form a whole by supporting the insulating member 2 and then installed into the receiving cavity 111 of the outer shell 1.

[0122] In these embodiments, by providing two first bends 22, the electrode assembly 3 and the thermally conductive insulation component 4 can be better fixed and limited, thereby improving the stability of the electrode assembly 3 and the thermally conductive insulation component 4.

[0123] Optionally, the first direction X is the thickness direction of the electrode assembly 3, the second direction Y is the length direction of the electrode assembly 3, and the third direction Z is the height direction of the electrode assembly 3. For example, the two first bends 22 are spaced apart along the second direction Y, thereby exposing the thermally conductive insulating member 4 located in the length direction of the electrode assembly 3, increasing the thermally conductive area of ​​the thermally conductive insulating member 4, and improving the thermal conductivity of the thermally conductive insulating member 4.

[0124] In some embodiments, the battery cell 10 further includes an insulating member 13, which is disposed on the side of the end cap 12 facing the electrode assembly 3, and two first bends 22 are located on both sides of the insulating member 13.

[0125] The insulating element 13 can be used to separate the end cap 12 from the electrode assembly 3. For example, the insulating element 13 is disposed between the end cap 12 and the electrode assembly 3 to provide connection space between the tab 32 and the electrode terminal 121 and to separate the electrode body 31 from the end cap 12.

[0126] The insulating element 13 also protects the electrode assembly 3, further preventing short circuits that may occur when the electrode assembly 3 is electrically connected to the metal housing 11 (such as an aluminum housing). Furthermore, the insulating element 13 also functions as a support bracket, positioned between the electrode assembly 3 and the end cap 12. When the end cap 12 is pressed against the electrode assembly 3, the insulating element 13 provides support and cushioning. For example, the insulating element 13 can be made of plastic.

[0127] In these embodiments, by covering both sides of the insulating member 13 with the two first bends 22, it is possible to further prevent the electrode assembly 3 from making conductive contact with the housing 1.

[0128] In these embodiments, the first bend 22 is connected to the end cap 12. This can mean that the first bend 22 is directly connected to the end cap 12, or that the first bend 22 is connected to the insulating member 13, so as to be indirectly connected to the end cap 12 through the insulating member 13.

[0129] In some embodiments, the supporting insulating member 2 further includes two second bends 23 disposed opposite to each other, the two first bends 22 and the two second bends 23 together covering the outer periphery of the insulating member 13; the second bends 23 are connected to at least one of the first bends 22.

[0130] If two first bends 22 are spaced apart along the second direction Y, two second bends 23 can be spaced apart along the first direction X. The two second bends 23 can be connected to the same first bend 22, or each second bend 23 can be connected to another second bend 22, or each second bend 23 can be connected between two first bends 22. For example, as shown... Figure 10 and Figure 11 As shown, the two second bends 23 are connected to the same first bend 22, but not to the other first bend 22, which facilitates the integral molding of the support insulation 2 and the unfolding and folding of the support insulation 2, so that it can be conveniently set on the outside of the electrode assembly 3 and the insulation 13.

[0131] In these embodiments, the two first bends 22 and the two second bends 23 cooperate to cover the outer periphery of the insulating member 13, which can further improve the effect of supporting the insulating member 2 to prevent the electrode assembly 3 from making conductive contact with the outer shell 1.

[0132] For example, the two first bends 22 and the two second bends 23 enclosing the outer periphery of the insulating member 13 can effectively prevent the tabs 32 from overlapping with the housing 11.

[0133] In some embodiments, two first bends 22 are disposed opposite each other in the length direction of the electrode assembly 3, and two second bends 23 are disposed opposite each other in the thickness direction of the electrode assembly 3.

[0134] Two first bending portions 22 are arranged opposite each other in the length direction of the electrode assembly 3, that is, the two first bending portions 22 are arranged at intervals along the second direction Y; two second bending portions 23 are arranged opposite each other in the thickness direction of the electrode assembly 3, that is, the two second bending portions 23 are arranged at intervals along the first direction X.

[0135] In these embodiments, by having two first bent portions 22 connected to the support portion 21 and extending to both sides of the insulating member 13 arranged opposite to each other along the length direction of the electrode assembly 3, the second bent portion 23 does not need to be connected to the support portion 21. The length of the second bent portion 23 extending along the second direction Y in the third direction Z can be shorter, thereby effectively reducing the surface area of ​​the support portion 21. In the case of covering the insulating member 13, more of the thermally conductive insulating member 4 can be exposed.

[0136] In some embodiments, the second bent portion 23 is spaced apart from the supporting portion 21.

[0137] The side surface of the thermally conductive insulating member 4 exposed by the second bend 23 extending along the length direction of the electrode assembly 3 is the large surface of the thermally conductive insulating member 4, and its area is relatively larger than that of the side surface in the thickness direction of the electrode assembly 3, thereby improving the heat conduction rate of the thermally conductive insulating member 4 to the electrode body 31.

[0138] In these embodiments, by spaced the second bend 23 from the support 21, more of the thermally conductive insulating element 4 can be exposed, increasing the thermally conductive area of ​​the thermally conductive insulating element 4 and improving its thermal conductivity.

[0139] Figure 8 This is one of the three-dimensional structural schematic diagrams of the thermally conductive insulating component in a battery cell provided in an embodiment of this application.

[0140] Reference Figure 7 and Figure 8 In some embodiments, the thermally conductive insulating member 4 is provided with a connecting portion 40 extending toward the end cover 12, and the connecting portion 40 is connected to the end cover 12.

[0141] Optionally, the connecting part 40 can be integrally formed with the thermally conductive insulating part 4 using the same material, so that the connecting part 40 will not reduce the thermal conductivity of the thermally conductive insulating part 4 to the end cover 12.

[0142] In these embodiments, by connecting the thermally conductive insulation 4 directly to the end cap 12 via the connecting portion 40, the heat exchange capacity between the thermally conductive insulation 4 and the outer casing 1 can be further enhanced.

[0143] In some embodiments, the thermally conductive insulating member 4 has a first opening 43, and the electrode terminal 121 is electrically connected to the tab 32 of the electrode assembly 3 through the first opening 43.

[0144] Electrode terminals 121 are used to connect electrode assembly 3 and external circuitry, thereby enabling interaction between battery cell 10 and the external environment, such as charging and discharging. There can be two electrode terminals 121, which serve as the positive and negative terminals of battery cell 10, respectively, connected to the external circuitry. For example, two electrode terminals 121 are spaced apart on end cap 12.

[0145] In these embodiments, the thermally conductive insulating member 4 has a first opening 43 to expose the electrode terminal 121 or the tab 32 of the electrode assembly 3, so that the electrode terminal 121 can be directly electrically connected to the tab 32 or electrically connected through the adapter member 122.

[0146] In addition, besides being connected to the end cap 12 via the connecting part 40, the thermally conductive insulating component 4 can also directly or indirectly contact the inner wall surface of the housing 11. That is, in this embodiment, in addition to conducting the heat of the electrode assembly 3 to the outside through the housing 11 over a large area, the thermally conductive insulating component 4 can also be directly connected to the end cap 12 to conduct the heat to the outside through the end cap 12, and can also conduct the heat to the housing 11 through the end cap 12, thereby increasing the thermal conductivity of the electrode assembly 3 and reducing safety issues caused by the excessive temperature of the electrode assembly 3.

[0147] In some embodiments, the connecting portion 40 includes an extension 401 and a bending portion 402. The extension 401 is connected between the bending portion 402 and the thermally conductive insulating member 4, and the side of the bending portion 402 facing away from the thermally conductive insulating member 4 is connected to the side of the end cap 12 facing the receiving cavity 111.

[0148] Typically, the electrode body 31 of the electrode assembly 3 is a certain distance from the end cap 12 to provide space for connecting the tab 32 to the electrode terminal 121 provided on the end cap 12. By providing the connection part 40, the thermally conductive insulating member 4, which is in direct thermal contact with the electrode body 31, can conduct heat through the connection part 40 to the end cap 12.

[0149] In these embodiments, by providing the extension section 401, the bending section 402 can be brought closer to the end cap 12, and the side of the bending section 402 away from the thermally conductive insulating member 4 is connected to the side surface of the end cap 12 facing the receiving cavity 111, thereby increasing the contact area between the bending section 402 and the end cap 12, and thus improving the thermal conductivity of the thermally conductive insulating member 4.

[0150] Optionally, the battery device 100 includes a water-cooling mechanism, and the housing 1 of the battery cell 10 is thermally connected to the water-cooling mechanism. The housing 11 and / or end cap 12 may be thermally connected to the water-cooling mechanism.

[0151] For example, the water cooling mechanism can be located on the shoulder of the battery module 200, that is, the water cooling mechanism is located outside the end cover 12 and is thermally connected to the end cover 12, so that the thermally conductive insulation 4 can conduct heat through the end cover and the water cooling mechanism.

[0152] Figure 9 This is a three-dimensional structural diagram of the end cap and insulating component of a battery cell provided in an embodiment of this application.

[0153] Reference Figure 7 and Figure 9 For example, an insulating member 13 is provided between the end cap 12 and the electrode assembly 3. By opening a clearance opening 131 on the insulating member 13, a bent section 402 that fits against the end cap 12 can be accommodated, providing space for the bent section 402. This allows for a more compact internal structure of the battery cell 10 and higher space utilization. It should be noted that the width of the clearance opening 131 in the second direction Y can be adaptively set according to actual conditions. To ensure the connection strength between the insulating member 13 and the second bent portion 23, sufficient width must be reserved when setting the clearance opening 131 so that the parts of the insulating member 13 on both sides of the clearance opening 131 that contact the second bent portion 23 have a certain connection strength.

[0154] In some embodiments, the bent section 402 extends from the extension section 401 in a direction away from the sidewall of the housing 11, or in other words, the bent section 402 extends from the extension section 401 toward the interior of the receiving cavity 111.

[0155] The extension section 401 can extend from the first heat-conducting sheet 41 toward the end cover 12 along the third direction Z. In order to avoid other components such as the insulating member 13 between the end cover 12 and the electrode body 31, the extension section 401 can be set on the side of the heat-conducting insulating member 4 near the inner wall of the housing 11. After the bending section 402 extends from the extension section 401 toward the inside of the receiving cavity 111 along the first direction X, it can increase its contact area with the end cover 12.

[0156] In these embodiments, by extending the bending section 402 from the extension section 401 in a direction away from the side wall of the housing 11, the contact area between the bending section 402 and the end cap 12 can be increased, thereby further improving the thermal conductivity of the thermally conductive insulating component 4.

[0157] In some embodiments, there are two connecting portions 40, which are spaced apart on the same side of the thermally conductive insulating member 4.

[0158] In these embodiments, the two connecting portions 40 are located on the same side of the thermally conductive insulating member 4, which can avoid the insulating member 13 together, making the arrangement simpler. Furthermore, by spacing the two connecting portions 40 apart, the connecting portions 40 can avoid interfering with the insulating member 13, making it easier to connect to the end cap 12.

[0159] For example, the connecting part 40 and the end cap 12 can be bonded or heat-fused together.

[0160] Reference Figure 8 In some embodiments, the electrode assembly 3 includes two first side surfaces and two second side surfaces. The two first side surfaces are arranged opposite each other in the first direction X, and the two second side surfaces are arranged opposite each other in the second direction Y. The area of ​​the first side surface is larger than the area of ​​the second side surface. The thermally conductive insulating member 4 includes two first thermally conductive sheets 41 arranged opposite each other in the first direction X. Each first thermally conductive sheet 41 is disposed between each first side surface and the inner wall of the housing 11. At least one first thermally conductive sheet 41 is provided with a connecting portion 40.

[0161] Optionally, the first direction X, the second direction Y, and the third direction Z are all perpendicular to each other.

[0162] Since the thermally conductive insulating element 4 is wrapped around the outer periphery of the electrode assembly 3, the various parts of the thermally conductive insulating element 4 are assembled into an interconnected whole. The two first thermally conductive sheets 41 can be directly connected or indirectly connected through other parts of the thermally conductive insulating element 4. Even if only one first thermally conductive sheet 41 is provided with a connecting part 40, the two first thermally conductive sheets 41 can achieve heat conduction with the end cap 12 through the connecting part 40.

[0163] Two first sides and two second sides are successively and alternately connected to form the sides of the electrode assembly 3.

[0164] In these embodiments, two first heat-conducting sheets 41 are arranged one-to-one with two larger first side surfaces, and both can conduct heat through the connecting part 40 and the end cap 12, which helps to increase the contact area between the thermally conductive insulating member 4 and the electrode body 31, thereby enhancing the heat conduction rate of the thermally conductive insulating member 4.

[0165] The electrode body 31 includes a first side and a second side with different areas. For example, the cross-section of the electrode body 31 perpendicular to the third direction Z is rectangular or elliptical.

[0166] Optionally, in the battery device 2, a heat exchange mechanism can be provided corresponding to the first side. The first side is thermally connected to the heat exchange mechanism, and the thermally conductive insulation component 4 can conduct heat between the heat exchange mechanism and the electrode assembly 3. The heat exchange mechanism can introduce or export heat to the thermally conductive insulation component 4. For example, the heat exchange mechanism can be provided on a water-cooled plate or a phase change heat sink or a cavity containing a heat exchange medium on the outer surface of the battery cell 10.

[0167] In some embodiments, the thermally conductive insulating member 4 further includes two second thermally conductive sheets 42, and the two first thermally conductive sheets 41 and the two second thermally conductive sheets 42 are alternately connected to enclose the electrode assembly 3.

[0168] Each second heat-conducting plate 42 is disposed between each second side surface and the inner wall of the housing 11. The two second heat-conducting plates 42 are arranged opposite each other in the second direction Y, and conduct heat through thermal connection with the second side surface.

[0169] In these embodiments, the first heat-conducting sheet 41 is connected by the second heat-conducting sheet 42, so that the heat-conducting insulating member 4 is disposed around the outer periphery of the electrode body 31, thereby further improving the heat conduction rate of the heat-conducting insulating member 4.

[0170] In this embodiment, the thermally conductive insulating component 4 forms a ring around the electrode assembly 3. Firstly, it serves to wrap and secure the assembly; secondly, it protects the electrode assembly 3 from puncture; and thirdly, it allows for faster heat transfer to the large aluminum shell and end cap 12 for heat dissipation, enabling the heat inside the electrode assembly 3 to be transferred to the outside more quickly. By providing a connecting portion 40 on the thermally conductive insulating component 4 and attaching it to the end cap 12, the heat dissipation efficiency of the electrode assembly 3 can be increased. Simultaneously, it prevents the tab 32 from contacting the housing 11 for electrical conduction on the outside of the tab 32.

[0171] Optionally, the thermally conductive insulating component 4 can be integrally molded to reduce the seams of the thermally conductive insulating component 4 and improve the structural stability of the thermally conductive insulating component 4.

[0172] In some embodiments, the battery cell 10 includes two or more electrode assemblies 3 and two or more thermally conductive insulating elements 4, with the thermally conductive insulating elements 4 corresponding to the electrode assemblies 3 one-to-one.

[0173] Each thermally conductive insulating component 4 covers each electrode assembly 3, and each thermally conductive insulating component 4 may be provided with a connecting part 40 to connect with the end cover 12, so that each thermally conductive insulating component 4 can individually conduct heat from each electrode assembly 3 to the end cover 12 through the connecting part 40.

[0174] In these embodiments, by providing multiple electrode assemblies 3 within the battery cell 10, the capacity of a single battery cell 10 can be increased. Furthermore, by providing a separate thermally conductive insulating component 4 for each battery cell 10, the temperature uniformity inside the battery cell 10 can be improved, and the rate of heat exchange between the inside of the electrode cell and the external environment can be increased to balance the internal temperature of the battery cell 10. This further mitigates the problem of adverse effects on the performance and lifespan of the battery cell 10 caused by excessively high or low internal temperatures.

[0175] In addition, two or more electrode components 3 can be stacked sequentially along the first direction X. The first side of the inner electrode component 3 can efficiently conduct heat through the thermally conductive insulating component 4 covering itself, or it can efficiently conduct heat through the thermally conductive insulating component 4 of the adjacent electrode component 3, which further improves the temperature uniformity inside the battery cell 10.

[0176] In some embodiments, a gap 400 is formed between the two ends of the thermally conductive insulating member 4 along the periphery of the electrode assembly 3, and the gap 400 is located on the side of the electrode assembly 3 that is disposed corresponding to the thermally conductive insulating member 4 and faces the adjacent electrode assembly 3.

[0177] After enclosing the electrode assembly 3, the thermally conductive insulating element 4 can be in contact with or disconnected from each other, or spaced apart. The thermally conductive insulating element 4 is a closed ring or a semi-enclosed ring, thus having a gap 400. The width of the gap 400 can be zero, close to zero, or greater than zero, and the specific size of the gap 400 can be designed independently. In these embodiments, the thermally conductive insulating element 4 is a long strip wrapped around the outer periphery of the electrode assembly 3, forming a gap 400 at both ends. This gap 400 is located on the side between two adjacent electrode assemblies 3, which on the one hand provides expansion space for the electrode assembly 3, and on the other hand reduces the risk of overlap between the electrode assembly 3 and the housing 11.

[0178] For example, refer to Figure 8 The gap 400 and the connecting part 40 are disposed opposite to each other on two different sides of the thermally conductive insulating member 4 at intervals in the first direction X, so that the connecting part 40 and the insulating member 13 can be fitted together.

[0179] Please see Figure 10 and Figure 11 , Figure 10 This is a three-dimensional structural diagram of the supporting insulation component in a battery cell provided in an embodiment of this application; Figure 11 This is a schematic diagram of the unfolded structure of the supporting insulating member in a battery cell according to an embodiment of this application.

[0180] In some embodiments, the supporting insulation element 2 is a one-piece molded component.

[0181] The insulating support component 2 is integrally molded and can have both unfolded and folded states, such as... Figure 11 As shown, the supporting insulating element 2 unfolds into parts located in the same plane, thus facilitating its fabrication. For example... Figure 5 and Figure 10 As shown, the supporting insulating component 2 can be folded and accommodated inside the housing 1, and can effectively support and cover the electrode assembly 3 and the insulating component 13.

[0182] In these embodiments, integral molding can improve the structural stability of the supporting insulation 2 and facilitate the unfolding and folding of the supporting insulation 2, so that it can be conveniently set on the outside of the electrode assembly 3 and the insulation 13.

[0183] In some embodiments, the supporting insulating member 2 encloses and forms a placement space 20, and the thermally conductive insulating member 4 is located in the placement space 20.

[0184] The supporting insulating component 2 encloses and forms a placement space 20, which can be a cuboid space jointly enclosed by the supporting part 21, two first bent parts 22 and two second bent parts 23.

[0185] In these embodiments, the supporting insulating member 2 is folded to form a placement space 20, which can surround the thermally conductive insulating member 4 from the side within the placement space 20, thereby providing a good fixing effect on the thermally conductive insulating member 4.

[0186] In some embodiments, the thermally conductive insulating element 4 includes a thermally conductive sheet and an insulating film covering the thermally conductive sheet, wherein the thermal conductivity k of the thermally conductive sheet satisfies k≥500W / (m·K).

[0187] In these embodiments, the insulating film serves to support and protect the heat-conducting sheet. When the thermal conductivity k of the heat-conducting sheet meets the above conditions, the heat-conducting sheet has sufficient thermal conductivity to conduct heat from the electrode body 31. Optionally, the thermal conductivity k of the heat-conducting sheet satisfies 500 W / (m·K) ≤ k ≤ 1600 W / (m·K). For example, the thermal conductivity of the heat-conducting sheet is 500 W / (m·K), 550 W / (m·K), 1050 W / (m·K), 1550 W / (m·K), or 1600 W / (m·K), etc. For example, the material of the first insulating film 91 can be PP or PI (polyimide) or PET (polyethylene terephthalate), etc.

[0188] In some embodiments, the heat-conducting sheet is made of graphite, graphene, or carbon nanotubes.

[0189] In these embodiments, graphite is typically composed of parallel layers of carbon atoms, exhibiting a planar sheet-like morphology. Graphene is typically a two-dimensional crystal composed of carbon atoms, with only one atom's thickness on one side, and has a fibrous shape. Carbon nanotubes are typically tubular structures formed by rolling up one or more layers of graphite. The thermal conductive sheet is made of graphite, graphene, or carbon nanotubes, and the thermal conductivity of the thermal conductive sheet is improved by using graphite, graphene, or carbon nanotube thermal conductive materials.

[0190] Optionally, the heat-conducting sheet can be made of supercrystalline graphite, which has a larger grain size than ordinary graphite and a significantly improved thermal conductivity, thus giving the heat-conducting sheet better thermal conductivity.

[0191] Optionally, the heatsink uses graphite thermal conductivity technology, which is a thermal conductivity technology based on graphite materials and microporous structures. Its principle is to utilize the high thermal conductivity of graphite materials to quickly transfer heat to the heatsink, and then dissipate the heat to the external environment rapidly through the microporous structure, thereby achieving a heat exchange effect.

[0192] Secondly, embodiments of this application provide a battery device including a battery cell 10 from any of the embodiments of the first aspect described above.

[0193] Thirdly, embodiments of this application provide an electrical device including a battery cell 10 from any of the embodiments of the first aspect, or a battery device from the embodiments of the second aspect. The battery cell 10 or the battery device is used to provide electrical energy to the electrical device.

[0194] The electrical equipment can be any of the aforementioned devices or systems that utilize battery devices.

[0195] According to some embodiments of this application, this application provides a battery cell 10, which includes a housing 1, an electrode assembly 3, a thermally conductive insulating member 4, and a supporting insulating member 2. The housing 1 includes a shell 11 and an end cap 12. The shell 11 has an opening, and the end cap 12 covers the opening and defines a receiving cavity 111 with the shell 11. The end cap 12 is provided with electrode terminals 121. The electrode assembly 3 is disposed in the receiving cavity 111 and includes tabs 32, which are electrically connected to the electrode terminals 121. The thermally conductive insulating member 4 is wrapped around the outer periphery of the electrode assembly 3 and is thermally connected to the housing 1. The supporting insulating member 2 includes a supporting portion 21, which is disposed at one end of the thermally conductive insulating member 4 away from the electrode terminals 121 and covers the electrode assembly 3. The supporting insulating member 2 also includes two electrodes connected to both sides of the supporting portion 21. The first bend 22 extends from the support portion 21 toward the end cap 12 and is connected to the end cap 12. The first bend 22 is located between the thermally conductive insulating member 4 and the outer shell 1. The battery cell 10 also includes an insulating member 13, which is disposed on the side of the end cap 12 facing the electrode assembly 3. The two first bends 22 are located on both sides of the insulating member 13. The supporting insulating member 2 also includes two opposing second bends 23, which together surround and cover the outer periphery of the insulating member 13. The second bends 23 are connected to at least one of the first bends 22. The two first bends 22 are opposite to each other in the length direction of the electrode assembly 3, and the two second bends 23 are opposite to each other in the thickness direction of the electrode assembly 3. The second bends 23 are spaced apart from the support portion 21.

[0196] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: The housing includes a shell and an end cap, the shell having an opening, the end cap covering the opening and defining a receiving cavity with the shell, and the end cap having electrode terminals; An electrode assembly is disposed in the receiving cavity, the electrode assembly including a tab, the tab being electrically connected to the electrode terminal; A thermally conductive insulating component is wound around the outer periphery of the electrode assembly and is thermally connected to the outer casing; The supporting insulating component includes a supporting portion disposed at one end of the thermally conductive insulating component away from the electrode terminal and covering the electrode assembly.

2. The battery cell according to claim 1, characterized in that, The supporting insulating component further includes two first bent portions connected to both sides of the supporting portion. The first bent portions extend from the supporting portion toward the end cap and are connected to the end cap. The first bent portions are located between the thermally conductive insulating component and the outer shell.

3. The battery cell according to claim 2, characterized in that, The battery cell also includes an insulating component, which is disposed on the side of the end cap facing the electrode assembly, and the two first bends are located on both sides of the insulating component.

4. The battery cell according to claim 3, characterized in that, The supporting insulating component also includes two opposing second bends, the two first bends and the two second bends together enclosing the outer periphery of the insulating component; The second bend is connected to at least one of the first bends.

5. The battery cell according to claim 4, characterized in that, The two first bends are arranged opposite each other in the length direction of the electrode assembly, and the two second bends are arranged opposite each other in the thickness direction of the electrode assembly.

6. The battery cell according to claim 4, characterized in that, The second bending portion is spaced apart from the supporting portion.

7. The battery cell according to claim 1, characterized in that, The thermally conductive insulating component is provided with a connecting portion extending toward the end cap, and the connecting portion is connected to the end cap.

8. The battery cell according to claim 7, characterized in that, The thermally conductive insulating element has a first opening, and the electrode terminal is electrically connected to the tab of the electrode assembly through the first opening.

9. The battery cell according to claim 8, characterized in that, The connecting portion includes an extension section and a bending section. The extension section is connected between the bending section and the thermally conductive insulating member. The side of the bending section away from the thermally conductive insulating member is connected to the side of the end cap facing the receiving cavity.

10. The battery cell according to claim 8, characterized in that, The electrode assembly includes two first sides and two second sides. The two first sides are arranged opposite each other in a first direction, and the two second sides are arranged opposite each other in a second direction. The area of ​​the first sides is larger than the area of ​​the second sides. The thermally conductive insulating component includes two first thermally conductive sheets arranged opposite each other in the first direction. Each first thermally conductive sheet is disposed between each first side and the inner wall of the housing. At least one of the first heat-conducting plates is provided with the connecting portion.

11. The battery cell according to claim 10, characterized in that, The thermally conductive insulating component also includes two second thermally conductive sheets, with the two first thermally conductive sheets and the two second thermally conductive sheets alternately connected to enclose the electrode assembly.

12. The battery cell according to any one of claims 1 to 11, characterized in that, The battery cell includes two or more electrode assemblies and two or more thermally conductive insulating components, with each thermally conductive insulating component corresponding to one of the electrode assemblies.

13. The battery cell according to claim 12, characterized in that, A gap is formed between the two ends of the thermally conductive insulating member along the periphery of the electrode assembly, and the gap is located on the side of the electrode assembly that is disposed corresponding to the thermally conductive insulating member and faces the adjacent electrode assembly.

14. The battery cell according to any one of claims 1 to 11, characterized in that, The supporting insulation component is a one-piece molded part.

15. The battery cell according to any one of claims 1 to 11, characterized in that, The supporting insulating component encloses and forms a placement space, and the thermally conductive insulating component is located in the placement space.

16. The battery cell according to any one of claims 1 to 11, characterized in that, The thermally conductive insulating component includes a thermally conductive sheet and an insulating film covering the thermally conductive sheet. The thermal conductivity k of the thermally conductive sheet satisfies k≥500W / (m·K).

17. The battery cell according to claim 16, characterized in that, The heat-conducting sheet is made of graphite, graphene, or carbon nanotubes.

18. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1 to 17.

19. An electrical appliance, characterized in that, It includes a battery cell according to any one of claims 1 to 17, the battery cell being used to provide electrical energy; or it includes a battery device according to claim 18, the battery device being used to provide electrical energy.

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