Battery cell, battery device, and electric device

Abstract

The application discloses a battery monomer, a battery device and a power utilization device. The battery monomer comprises a shell, an electrode assembly, a cover plate assembly and a second insulating piece. The shell defines a containing cavity with an open port. The electrode assembly is arranged in the containing cavity. The cover plate assembly comprises a cover plate and a first insulating piece. The cover plate is arranged on the shell to cover the open port. The first insulating piece comprises a body part and at least one supporting boss. The body part is arranged between the cover plate and the electrode assembly. The at least one supporting boss is arranged on one side of the body part facing the electrode assembly. The supporting boss has a supporting surface which supports the electrode assembly. The first insulating piece is configured so that the melting point of at least the supporting surface is greater than the melting point of the body part. At least the part of the electrode assembly in contact with the supporting surface is provided with the second insulating piece. The melting point of the second insulating piece is greater than the melting point of the body part. In a certain extent, the short circuit of the electrode assembly caused by the invasion and extrusion of the supporting boss can be avoided, and the use safety of the battery monomer is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell, battery device, and power supply device. Background Technology

[0002] With the development of technology, the application of battery cells is becoming more and more widespread, and the safety of battery cell use has attracted the attention of most people.

[0003] In the prior art, the insulating material between the electrode assembly and the cover plate is generally PP (Polypropylene). When a battery cell experiences thermal runaway, the temperature of the adjacent normal battery cells will generally exceed 200°C. This can lead to the insulating material intruding into and squeezing the electrode assembly. Furthermore, because the insulating material is prone to melting at high temperatures and then solidifying, it can easily puncture the separator of the electrode assembly, which can cause the electrode assembly to short-circuit, posing a risk of thermal diffusion and affecting the safety of the battery device. Summary of the Invention

[0004] This application provides a battery cell, a battery device, and an electrical device, which can, to a certain extent, avoid the problem of short circuits caused to the electrode assembly when the support boss intrudes into and squeezes the electrode assembly, thereby improving the safety of the battery device.

[0005] In a first aspect, embodiments of this application provide a battery cell, comprising: a housing defining a receiving cavity with an open opening; an electrode assembly disposed within the receiving cavity; a cover assembly including a cover plate and a first insulating member, the cover plate being disposed on the housing to cover the open opening, the first insulating member including a body portion and at least one support boss, the body portion being disposed between the cover plate and the electrode assembly, at least one support boss being disposed on the side of the body portion facing the electrode assembly, the support boss having a support surface supporting the electrode assembly, the first insulating member being configured such that at least the melting point of the support surface is greater than the melting point of the body portion; and / or, at least a portion of the electrode assembly in contact with the support surface is provided with a second insulating member, the melting point of the second insulating member being greater than the melting point of the body portion.

[0006] In the above technical solution, by setting the melting point of at least the supporting surface of the first insulating member to be greater than the melting point of the main body, and / or by providing a second insulating member at least in contact with the supporting surface of the electrode assembly, and setting the melting point of the second insulating member to be greater than the melting point of the main body, the melting of the first insulating member and / or the second insulating member in contact with the electrode assembly can be avoided to a certain extent when they are exposed to high temperatures. This also avoids the first insulating member and / or the second insulating member in contact with the electrode assembly from penetrating and squeezing the electrode assembly and puncturing the separator of the electrode assembly, thereby achieving the purpose of avoiding short circuits in the electrode assembly and improving the safety of the battery device.

[0007] In some embodiments, the support boss includes a boss portion and a third insulating member, the boss portion being disposed on the body portion, the third insulating member being disposed on the side of the boss portion facing the electrode assembly, the third insulating member at least defining the support surface, and the melting point of the third insulating member being greater than the melting point of the body portion.

[0008] In the above technical solution, the melting point of the support surface can be made greater than that of the body, reducing the molding difficulty of the support surface. This can, to a certain extent, prevent the electrode assembly from short-circuiting when the support surface intrudes into the electrode assembly, thereby preventing heat diffusion and improving the safety of the battery device.

[0009] In some embodiments, the third insulating member is wrapped around the outer periphery of the boss portion.

[0010] In the above technical solution, the third insulating member is placed on the side of the boss facing the electrode assembly, which reduces the difficulty of fitting the third insulating member and the boss, thereby facilitating the use of the third insulating member to achieve the insulating fit between the boss and the electrode assembly, and avoiding short circuit of the electrode assembly when the support surface intrudes into the electrode assembly.

[0011] In some embodiments, the third insulating element is an insulating film coated on the boss portion.

[0012] In the above technical solution, while ensuring the insulation performance of the third insulating component, the molding difficulty of the third insulating component can also be reduced.

[0013] In some embodiments, the boss portion and the body portion are separate parts, and the melting point of the boss portion is greater than the melting point of the body portion.

[0014] In the above technical solution, the electrode assembly is prevented from short-circuiting when the boss intrudes into it.

[0015] In some embodiments, the boss portion is a metal part.

[0016] In the above technical solution, the boss can effectively stop the electrode assembly, prevent the electrode assembly from moving upward, improve the positional stability of the electrode assembly, and help improve the safety of the battery device.

[0017] In some embodiments, the body portion overlaps with the support boss.

[0018] In the above technical solution, gaps between the main body and the supporting boss in the length direction of the main body can be avoided to a certain extent, thereby improving the insulation performance of the first insulating member.

[0019] In some embodiments, the support boss is located at the end of the body portion along its length, the support boss is provided with a receiving groove, and the end of the body portion is located within the receiving groove.

[0020] In the above technical solution, the main body and the supporting boss are connected and fitted together.

[0021] In some embodiments, the outer periphery of the electrode assembly is covered with an insulating layer, and the boss portion or the body portion is fixedly connected to the insulating layer.

[0022] The above technical solution can improve the positional stability of the insulating layer, thereby facilitating the use of the insulating layer to provide insulation protection for the electrode assembly.

[0023] In some embodiments, a connecting boss is formed at the end of the body portion, the connecting boss protrudes toward the electrode assembly, the boss portion is located at the end of the body portion in the length direction and overlaps with the body portion, the boss portion is provided with a relief groove to avoid the connecting boss, and the connecting boss is fixedly connected to the insulating layer.

[0024] In the above technical solution, the fixed connection between the main body and the insulating layer is achieved, and the difficulty of fixing the main body and the insulating layer is reduced.

[0025] In some embodiments, the support boss and the body are separate components, and the melting point of the support boss as a whole is greater than the melting point of the body.

[0026] In the above technical solution, it is convenient to set the melting point of the support surface to be greater than that of the main body, and at the same time, the setting of the third insulating component can be omitted, simplifying the structure of the first insulating component, thereby reducing the molding difficulty of the first insulating component.

[0027] In some embodiments, the support bosses include a plurality of support bosses, which are arranged sequentially at intervals along the length direction of the body portion, and the melting point of the support surfaces near the two ends of the body portion along the length direction is greater than the melting point of the body portion.

[0028] In the above technical solution, while improving the support effect of the first insulating member on the electrode assembly, it can also prevent the electrode assembly from short-circuiting when the supporting boss invades the electrode assembly.

[0029] In some embodiments, the melting point of the support surface is ≥200°C; and / or, the melting point of the second insulating element is ≥200°C.

[0030] In the above technical solution, the supporting boss and / or the second insulating member have a high melting point, so that the melting point of the supporting boss and / or the second insulating member can be higher than the melting point of the main body. In this way, when the battery cell expands and deforms due to heat, it can avoid the short circuit of the electrode assembly caused by the supporting boss intruding into the electrode assembly to a certain extent.

[0031] In some embodiments, the support surface satisfies a resistance ≥200 Mohm at 500V; and / or, the second insulating member satisfies a resistance ≥200 Mohm at 500V.

[0032] In the above technical solution, the supporting boss and the second insulating component have high insulation performance, which can, to a certain extent, prevent the electrode assembly from short-circuiting when the supporting boss invades the electrode assembly.

[0033] Secondly, embodiments of this application provide a battery device including the aforementioned battery cell.

[0034] In the above technical solution, by using the aforementioned battery cells, the safety of the battery device can be improved to a certain extent, and the service life of the battery device can be extended.

[0035] Thirdly, embodiments of this application provide an electrical device, including the aforementioned battery cell or the aforementioned battery device, wherein the battery cell or the battery device is used to store or provide electrical energy.

[0036] In the above technical solution, by using the aforementioned battery cells or battery devices, the working performance of the electrical device can be guaranteed, the safety of the electrical device can be improved, and the service life of the electrical device can be extended.

[0037] Additional aspects and advantages of this application will become apparent from the description which follows, or may be learned by practice of this application. Attached Figure Description

[0038] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of an electrical device according to some embodiments of this application.

[0040] Figure 2 This is a schematic diagram of a battery device according to some embodiments of this application.

[0041] Figure 3 This is an exploded view of a battery cell according to some embodiments of this application.

[0042] Figure 4 This is an exploded view of a cover plate assembly according to some embodiments of this application.

[0043] Figure 5 This is an exploded view of a cover plate assembly and a second insulating member according to some embodiments of the first aspect of this application.

[0044] Figure 6 This is a schematic diagram of an electrode assembly and a second insulating member according to some embodiments of the second aspect of this application.

[0045] Figure 7 This is an exploded view of an electrode assembly and a second insulating member according to some embodiments of the second aspect of this application.

[0046] Figure 8 This is an exploded view of a first insulating member according to some embodiments of the third aspect of this application.

[0047] Figure 9 This is a bottom view of a first insulating member according to some embodiments of the third aspect of this application.

[0048] Figure 10 This is a schematic diagram of a first insulating member according to some embodiments of the fourth aspect of this application.

[0049] Figure 11 An exploded view of a first insulating member according to some embodiments of the fourth aspect of this application.

[0050] Figure 12 This is an exploded view of a first insulating member according to some embodiments of the fifth aspect of this application.

[0051] Figure 13 This is an exploded view of a cover plate assembly according to some embodiments of the sixth aspect of this application.

[0052] Figure 14 This is a top view of a first insulating member according to some embodiments of the sixth aspect of this application.

[0053] Figure 15 for Figure 14 Cross-sectional view along line AA.

[0054] Figure 16 for Figure 15 A magnified view of region I in the middle.

[0055] Figure label:

[0056] 2000, Electrical Appliances

[0057] 1000, battery cell;

[0058] 100. Outer shell;

[0059] 200. Electrode assembly; 700. Tab;

[0060] 300. Cover plate assembly;

[0061] 310. Cover plate;

[0062] 320. First insulating component;

[0063] 321. Body part; 3211. Connecting boss; 3212. First hot melt pillar;

[0064] 322. Support boss;

[0065] 3221. Support surface; 3222. Boss portion; 3223. Third insulating component;

[0066] 3224. Receiving groove; 3225. Clearance groove; 3226. Second hot melt column;

[0067] 400, Second insulating component; 500, Insulating layer; 600, Explosion-proof valve;

[0068] 1100 Battery assembly; 1110 Housing; 1111 Upper housing; 1112 Lower housing;

[0069] 1200, Controller; 1300, Motor. Detailed Implementation

[0070] 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.

[0071] 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.

[0072] In this application, the reference to "embodiment" means that a specific 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 throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0073] 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.

[0074] 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: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0075] 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.

[0076] In this application, "multiple" means two or more, including two.

[0077] Currently, judging from market trends, the application of battery cells is becoming increasingly widespread. Battery cells 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 vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace, among other fields.

[0078] As the application fields of battery cells continue to expand, the market demand for them is also constantly increasing.

[0079] The battery cell mentioned here can be a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, etc., and this application embodiment is not limited to this. Similarly, the battery cell can be cylindrical, flat, cuboid, or other shapes, and this application embodiment is not limited to this either. Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and this application embodiment is not limited to this either.

[0080] For example, a battery cell may typically include a casing, an electrode assembly, and an electrolyte. The casing is used to house the electrode assembly and the electrolyte, and has at least one positive electrode post and at least one negative electrode post. The electrode assembly includes one or more electrodes, which are formed by stacking or winding positive electrode sheets, negative electrode sheets, and separators.

[0081] The positive electrode typically includes a positive current collector and a positive active material layer. The positive active material layer is directly or indirectly coated on the positive current collector, and multiple positive electrode tabs are stacked together and electrically connected to the positive electrode post. For example, the stacked positive electrode tabs can be directly welded to the positive electrode post to form an electrical connection; alternatively, the battery cell may also include a positive electrode adapter, with the stacked positive electrode tabs welded to one end of the adapter, and the other end of the adapter welded to the positive electrode post, thus forming an electrical connection between the positive electrode tabs and the positive electrode post.

[0082] The negative electrode generally includes a negative current collector and a negative active material layer. The negative active material layer is directly or indirectly coated on the negative current collector, and multiple negative electrode tabs are stacked together and electrically connected to the negative electrode post. For example, the stacked negative electrode tabs can be directly welded to the negative electrode post to form an electrical connection; alternatively, the battery cell may also include a negative electrode adapter piece, with the stacked negative electrode tabs welded to one end of the adapter piece, and the other end of the adapter piece welded to the negative electrode post, so that the negative electrode tabs and the negative electrode post form an electrical connection.

[0083] The material of the diaphragm is not limited; for example, it can be polypropylene or polyethylene.

[0084] The casing generally includes a main body, a cover plate, and an insulating component. The main body forms a receiving cavity, in which the electrode assembly is located. The cover plate and the insulating component are both located at the opening of the receiving cavity, with the insulating component positioned between the cover plate and the electrode assembly. The insulating component can, to a certain extent, prevent leakage from individual battery cells, improving the safety of individual battery cell use. At the same time, the insulating component can also effectively support the end face of the electrode assembly. Since the electrode assembly is in a slightly compressed state after being installed in the casing and the cover plate is welded, and the electrode assembly is also in a vibrating environment during vehicle use, insufficient restraint on the electrode assembly can easily affect its lifespan or cause a short circuit. Therefore, the insulating component is set to effectively support the end face of the electrode assembly to reduce the possibility of vertical movement of the electrode assembly.

[0085] Therefore, the above can also be understood as setting an insulating component between the cover plate and the electrode assembly, which is beneficial to improving the safety, stability and service life of the battery cell, while enabling the battery cell to adapt to complex and ever-changing working environments.

[0086] The applicant discovered that in related technologies, the insulating material inside the battery cell is generally PP, which results in the melting point of the insulating material being generally below 200°C. When a battery cell experiences thermal runaway, the temperature of the adjacent normal battery cell generally exceeds 200°C, causing the insulating material of the adjacent normal battery cell to easily melt. Furthermore, after the insulating material melts and solidifies, it is prone to producing sharp points. When the insulating material squeezes and penetrates the electrode assembly, it can easily puncture the separator of the electrode assembly, thereby easily causing a short circuit in the electrode assembly, posing a risk of thermal runaway and affecting the safety of the entire battery device.

[0087] To solve the above problems, combined with Figures 3-16 As shown, this application embodiment provides a battery cell 1000. The battery cell 1000 sets the melting point of at least the support surface 3221 of the first insulating member 320 to be greater than the melting point of the body portion 321, and / or provides a second insulating member 400 in at least the portion of the electrode assembly 200 that contacts the support surface 3221, and sets the melting point of the second insulating member 400 to be greater than the melting point of the body portion 321. This can, to a certain extent, prevent the first insulating member 320 and / or the second insulating member 400 in contact with the electrode assembly 200 from melting when the temperature of the battery cell 1000 exceeds 200°C. This also prevents the first insulating member 320 and / or the second insulating member 400 from piercing the separator of the electrode assembly 200 when it squeezes and penetrates the electrode assembly 200, thereby preventing short circuits in the electrode assembly 200, thus preventing heat diffusion, improving the safety of the battery device 1100, and solving the technical problem of heat diffusion when the battery cell 1000 experiences thermal runaway in related technologies.

[0088] This application embodiment also provides a battery device 1100 including the above-mentioned battery cell 1000, such as... Figure 2 As shown, battery device 1100 refers to a single physical module comprising multiple battery cells 1000 to provide higher voltage and capacity. For example, battery device 1100 mentioned in this application may include one or more battery packs for providing voltage and capacity. The battery pack may include multiple battery cells 1000, which are connected in series, parallel, or mixed connections via busbars.

[0089] In some embodiments, the battery pack is typically formed by arranging multiple battery cells 1000. As an example, the battery pack can be a battery module, which is formed by arranging and fixing multiple battery cells 1000 together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells 1000 together with cable ties.

[0090] In some embodiments, such as Figure 2 As shown, the battery device 1100 generally includes a housing 1110 for encapsulating one or more battery packs. The housing 1110 can, to a certain extent, prevent liquids or other foreign objects from affecting the charging or discharging of the individual battery cells 1000. Of course, the battery device 1100 may also not include the housing 1110.

[0091] In a specific example, battery device 1100 can be understood as a battery pack.

[0092] In some embodiments, such as Figure 2 As shown, the battery cell 1000 is housed within the housing 1110. This allows the housing 1110 to support and protect the battery cell 1000, improving its structural stability, extending its lifespan, and enhancing its safety during use.

[0093] The housing 1110 can adopt various structures.

[0094] In some embodiments, such as Figure 2 As shown, the housing 1110 may include an upper housing 1111 and a lower housing 1112. The upper housing 1111 and the lower housing 1112 cover each other. The upper housing 1111 and the lower housing 1112 together define a cavity for accommodating the battery cell 1000, thereby reducing the molding difficulty of the housing 1110 and making it easier to place the battery cell 1000 inside the housing 1110.

[0095] In this design, the upper housing 1111 can be a hollow structure open at one end, and the lower housing 1112 can be a plate-like structure. The lower housing 1112 covers the open side of the upper housing 1111 (not shown in the example figure), so that the upper housing 1111 and the lower housing 1112 together define a cavity; or, the lower housing 1112 can be a hollow structure open at one end, and the upper housing 1111 can be a plate-like structure (not shown in the example figure), with the upper housing 1111 covering the open side of the lower housing 1112, so that the upper housing 1111 and the lower housing 1112 can also cooperate to define a cavity; or, as... Figure 2 As shown, both the upper box 1111 and the lower box 1112 are hollow structures with one side open. The open side of the upper box 1111 covers the open side of the lower box 1112 to define the cavity.

[0096] It should be noted that the box 1110 formed by the upper box 1111 and the lower box 1112 can be of various shapes, such as cylinder, cube or cuboid; the battery cell 1000 can be of various shapes, such as cylinder, square or square.

[0097] This application embodiment also provides an electrical device 2000 including the above-mentioned battery cell 1000 or battery device 1100 (e.g., Figure 1 As shown, the battery cell 1000 or battery device 1100 is used to store or provide electrical energy so as to provide electrical energy to the power-consuming device 2000 and to a certain extent ensure the working performance of the power-consuming device 2000.

[0098] The electrical device 2000 mentioned here can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc.

[0099] Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric boat toys, and electric airplane toys; spacecraft can include airplanes, rockets, space shuttles, and spaceships; 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.

[0100] For ease of explanation, the following embodiments use a vehicle as an example to describe the structure of the electrical device 2000 of this application in detail.

[0101] Please refer to Figure 1 , Figure 1The electrical device 2000 is shown as a vehicle. The vehicle 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. The vehicle is equipped with a battery device 1100, which can be located at the bottom, front, or rear of the vehicle. The battery device 1100 can be used to power the vehicle; for example, the battery device 1100 can serve as the vehicle's operating power source.

[0102] In some embodiments, such as Figure 1 As shown, the vehicle may also include a controller 1200 and a motor 1300. The controller 1200 is used to control the battery device 1100 to supply power to the motor 1300, for example, for the power needs of the vehicle during starting, navigation and driving.

[0103] In some embodiments of this application, the battery device 1100 can not only serve as the operating power source for the vehicle, but also as the driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0104] The following description, with reference to the accompanying drawings, describes a battery cell 1000 according to an embodiment of this application.

[0105] Combination Figures 3-7 As shown, the battery cell 1000 includes a housing 100, an electrode assembly 200, a cover assembly 300, and a second insulating component 400.

[0106] Among them, such as Figure 3 As shown, the housing 100 defines a receiving cavity with an open opening. The receiving cavity provides space for other components of the battery cell 1000 (such as the electrode assembly 200), which reduces the assembly difficulty of the housing 100 and other components to a certain extent, thereby reducing the assembly difficulty of the battery cell 1000 and improving the assembly efficiency.

[0107] like Figure 3 As shown, the electrode assembly 200 is disposed within the receiving cavity. This allows the electrode assembly 200 to be disposed within the housing 100, reducing the assembly difficulty between the electrode assembly 200 and the housing 100. While facilitating the formation of the battery cell 100 using the electrode assembly 200, the housing 100 can also protect the electrode assembly 200, extend its service life, and improve its safety during use.

[0108] Combination Figure 3 , Figure 4 and Figure 5As shown, the cover plate assembly 300 includes a cover plate 310 and a first insulating member 320. The cover plate 310 is disposed on the housing 100 to cover the opening. The first insulating member 320 includes a body portion 321 and at least one supporting boss 322. The body portion 321 is disposed between the cover plate 310 and the electrode assembly 200. At least one supporting boss 322 is disposed on the side of the body portion 321 facing the electrode assembly 200. The supporting boss 322 has a supporting surface 3221, which supports the electrode assembly 200.

[0109] By placing the cover plate 310 on the outer casing 100 to seal the opening, the battery cell 1000 has good sealing performance, which can prevent impurities such as air and moisture from entering the battery cell 1000 and prevent electrolyte leakage from the battery cell 1000 to a certain extent. This allows the electrode assembly 200 and other components of the battery cell 1000 to work stably, thereby ensuring the working performance of the battery cell 1000.

[0110] Meanwhile, by configuring the first insulating member 320 to include a body portion 321 and at least one supporting boss 322, and configuring the supporting boss 322 to have a supporting surface 3221, when the supporting surface 3221 supports the electrode assembly 200, the first insulating member 320 can provide support for the electrode assembly 200, which can greatly prevent the electrode assembly 200 from shifting or moving within the housing 100 due to vibration, collision, or other reasons, thus maintaining the stability of the electrode assembly 200. Furthermore, the supporting surface 3221 of the supporting boss 322 can also position the electrode assembly 200 during the assembly of the battery cell 1000, so that the electrode assembly 200 can be accurately installed within the housing 100, ensuring the safety and normal operation of the battery cell 1000.

[0111] Furthermore, by placing the body portion 321 of the first insulating member 320 between the cover plate 310 and the electrode assembly 200, direct contact between the electrode assembly 200 and the cover plate 310 can be prevented to a certain extent, thereby avoiding a short circuit caused by direct contact between the electrode assembly 200 and the outer casing 100, and ensuring the safety and normal operation of the battery cell 1000.

[0112] The first insulating member 320 is configured such that at least the melting point of the supporting surface 3221 is greater than the melting point of the body portion 321, and / or, in combination with Figure 5 , Figure 6 and Figure 7 As shown, at least the portion of the electrode assembly 200 that contacts the support surface 3221 is provided with a second insulating member 400, and the melting point of the second insulating member 400 is greater than the melting point of the body portion 321.

[0113] It should be noted that the first insulating component 320 is generally made of PP, and the melting point of PP is generally below 200°C. When an adjacent battery cell 1000 experiences thermal runaway, the temperature of the battery cell 1000 generally exceeds 200°C, causing the battery cell 1000 to easily expand and deform, and the first insulating component 320 to easily melt. When the first insulating component 320 melts and the temperature of the battery cell 1000 is below 200°C, the first insulating component 320 will solidify again, and sharp points are easily formed on the surface of the first insulating component 320. Thus, when the battery cell 1000 expands and deforms due to heat, and the support surface 3221 of the first insulating component 320 squeezes and penetrates the electrode assembly 200, there is a risk that the first insulating component 320 will puncture the separator of the electrode assembly 200, which may lead to a short circuit in the electrode assembly 200, resulting in heat diffusion and potentially causing the entire battery device 1100 to run out of control, posing a great danger.

[0114] Based on this, this application sets the melting point of at least the supporting surface 3221 of the first insulating member 320 to be greater than the melting point of the body portion 321, and / or, provides a second insulating member 400 in at least the portion of the electrode assembly 200 that contacts the supporting surface 3221, and sets the melting point of the second insulating member 400 to be greater than the melting point of the body portion 321. This allows the melting points of the first insulating member 320 and / or the second insulating member 400 that contacts the electrode assembly 200 to be higher. In this way, when the temperature of the battery cell 1000 rises, the first insulating member 320 and / or the second insulating member 400 can be prevented from melting, thereby preventing the electrode assembly 200 from short-circuiting when the first insulating member 320 and / or the second insulating member 400 invades the electrode assembly 200, thus avoiding heat diffusion and improving the safety of the battery device 1100.

[0115] It should be noted that when the second insulating member 400 is provided on at least a portion of the electrode assembly 200 that contacts the support surface 3221, the second insulating member 400 may be provided on the side of the support surface 3221 facing the electrode assembly 200 (e.g., Figure 5 As shown), the second insulating member 400 can also be provided on the side of the electrode assembly 200 facing the support surface 3221 (e.g. Figure 6 and Figure 7 (As shown).

[0116] As can be seen from the above structure, the battery cell 1000 of this application embodiment, by setting the melting point of the first insulating member 320 forming at least the support surface 3221 to be greater than the melting point of the body portion 321, and / or by providing a second insulating member 400 on at least the portion of the electrode assembly 200 in contact with the support surface 3221, and setting the melting point of the second insulating member 400 to be greater than the melting point of the body portion 321, can to a certain extent avoid the electrode assembly 200 from short-circuiting when the support surface 3221 of the first insulating member 320 invades the electrode assembly 200, thereby avoiding heat diffusion and improving the safety of the battery device 1100.

[0117] It is understood that, compared with the prior art, this application sets the melting point of the first insulating member 320, which forms at least the support surface 3221, to be greater than the melting point of the body portion 321, and / or provides a second insulating member 400 on at least the portion of the electrode assembly 200 that contacts the support surface 3221, and sets the melting point of the second insulating member 400 to be greater than the melting point of the body portion 321. This can, to a certain extent, prevent the electrode assembly 200 from short-circuiting when the support surface 3221 of the first insulating member 320 intrudes into the electrode assembly 200, thereby preventing heat diffusion and improving the safety of the battery device 1100.

[0118] It should be noted that the body portion 321 and the support boss 322 can be either a single piece or separate pieces. When the body portion 321 and the support boss 322 are a single piece, since the materials of the body portion 321 and the support boss 322 must be the same, in order to avoid heat diffusion, a second insulating member 400 can be provided on at least the portion of the electrode assembly 200 that contacts the support surface 3221. This can, to a certain extent, prevent the electrode assembly 200 from short-circuiting when the support surface 3221 of the first insulating member 320 intrudes into the electrode assembly 200. When the main body 321 and the support boss 322 are separate parts, since the materials of the main body 321 and the support boss 322 can be set to be different, the melting point of the support surface 3221 can be set to be greater than the melting point of the main body 321 by selecting materials. Alternatively, a second insulating member 400 can be provided in at least the part of the electrode assembly 200 that contacts the support surface 3221, thereby avoiding short circuit of the electrode assembly 200 when the support surface 3221 of the first insulating member 320 invades the electrode assembly 200 to a certain extent.

[0119] In some embodiments, when the body portion 321 and the support boss 322 are separate parts, the body portion 321 and the support boss 322 can be fixed by means of bonding, snap-fitting or other connection methods.

[0120] In some embodiments, the support surface 3221 may be made of PI (Polyimide) material, and / or the second insulating member 400 may be made of PI material, since PI has a melting point as high as 400°C, so that the melting point of the support surface 3221 is greater than the melting point of the body portion 321 and / or the melting point of the second insulating member 400 is greater than the melting point of the body portion 321.

[0121] In some embodiments, such as Figure 4 As shown, the battery cell 1000 also includes an explosion-proof valve 600, which is configured to rupture when the internal pressure of the battery cell 1000 increases. Thus, when thermal runaway occurs in the battery cell 1000 and the internal temperature and pressure rise rapidly, the explosion-proof valve 600 can open to release pressure and heat, preventing further development of thermal runaway to a certain extent, preventing heat from spreading to adjacent battery cells 1000, and reducing the risk of thermal runaway.

[0122] In some embodiments, such as Figure 3 As shown, the electrode assembly 200 also includes a tab 700, which facilitates the collection of current generated by the electrode assembly 200 and its transmission to the external circuit of the battery cell 1000, or the transmission of current input from the external circuit of the battery cell 1000 to the electrode assembly 200, thereby ensuring the working performance of the electrode assembly 200 to a certain extent.

[0123] In some embodiments, combined with Figure 3 , Figure 8 and Figure 12 As shown, the support boss 322 includes a boss portion 3222 and a third insulating member 3223. The boss portion 3222 is disposed on the body portion 321, and the third insulating member 3223 is disposed on the side of the boss portion 3222 facing the electrode assembly 200. The third insulating member 3223 at least defines the support surface 3221, and the melting point of the third insulating member 3223 is greater than the melting point of the body portion 321. This ensures that at least the melting point of the support surface 3221 is greater than the melting point of the body portion 321, reducing the molding difficulty of the support surface 3221. This, to a certain extent, avoids short circuits in the electrode assembly 200 when the support surface 3221 intrudes into the electrode assembly 200, thereby preventing heat diffusion and improving the safety of the battery device 1100.

[0124] In some embodiments, the third insulating member 3223 wraps around the outer periphery of the boss portion 3222. This allows the third insulating member 3223 to be disposed on the side of the boss portion 3222 facing the electrode assembly 200, reducing the difficulty of fitting the third insulating member 3223 and the boss portion 3222. This facilitates the use of the third insulating member 3223 to achieve an insulating fit between the boss portion 3222 and the electrode assembly 200, and to a certain extent avoids short circuits in the electrode assembly 200 when the support surface 3221 intrudes into the electrode assembly 200.

[0125] In some embodiments, the third insulating member 3223 is wrapped around all the outer peripheries of the boss portion 3222, or the third insulating member 3223 is provided only on the side of the boss portion 3222 facing the electrode assembly 200.

[0126] Furthermore, when the third insulating member 3223 is wrapped around the outer periphery of the boss portion 3222, the third insulating member 3223 can be fixed by means of bonding or snap-fitting to improve the positional stability of the third insulating member 3223 and improve the working performance of the third insulating member 3223 to a certain extent.

[0127] In some embodiments, the third insulating member 3223 is made of PI material so that the melting point of the third insulating member 3223 is greater than the melting point of the body portion 321.

[0128] Optionally, a high-temperature resistant adhesive coating can be sprayed onto the outer periphery of the boss portion 3222 to form a third insulating component 3223; or, high-temperature resistant adhesive paper can be adhered to the outer periphery of the boss portion 3222 to form a third insulating component 3223, thereby to a certain extent preventing the electrode assembly 200 from short-circuiting when the support surface 3221 intrudes into the electrode assembly 200, thereby preventing heat diffusion and improving the safety of the battery device 1100.

[0129] In some embodiments, combined with Figure 8 and Figure 9 As shown, the third insulating element 3223 is an insulating film coated on the boss portion 3222. While ensuring the insulating performance of the third insulating element 3223, the molding difficulty of the third insulating element 3223 can also be reduced.

[0130] Optionally, the insulating film coated on the boss portion 3222 by the third insulating member 3223 can be located on the entire outer periphery of the boss portion 3222; or, it can be located on a part of the boss portion 3222, but it needs to at least cover the support surface 3221. Both of these positions of the insulating film can prevent the electrode assembly 200 from short-circuiting when the support surface 3221 invades the electrode assembly 200.

[0131] In some embodiments, combined with Figure 10 and Figure 11 As shown, the boss portion 3222 and the body portion 321 are separate parts, and the melting point of the boss portion 3222 is greater than that of the body portion 321. This means that when the body portion 321 and the boss portion 3222 are separate parts, the melting point of the boss portion 3222 can be directly set to be greater than that of the body portion 321 to effectively prevent the electrode assembly 200 from short-circuiting when the boss portion 3222 intrudes into the electrode assembly 200.

[0132] In some embodiments, the boss portion 3222 is made of PI material so that the melting point of the boss portion 3222 is greater than the melting point of the body portion 321.

[0133] It should be noted that when the melting point of the boss portion 3222 is greater than the melting point of the body portion 321, the third insulating member 3223 can be omitted to simplify the structure of the first insulating member 320 and reduce the molding difficulty of the first insulating member 320.

[0134] In some embodiments, the boss portion 3222 is a metal part. This means that the boss portion 3222 is made of metal. Since metal has higher structural strength, the above-mentioned arrangement allows the boss portion 3222 to effectively stop the electrode assembly 200, prevent the electrode assembly 200 from shifting upwards, improve the positional stability of the electrode assembly 200, and help improve the safety of the battery device 1100.

[0135] Of course, in some other embodiments, the boss portion 3222 is a plastic part, such as: the boss portion 3222 is made of PI material.

[0136] Optionally, when the boss portion 3222 is a metal or plastic part, a high-temperature resistant adhesive coating can be sprayed onto the side of the boss portion 3222 facing the electrode assembly 200, i.e., the support surface 3221; or, a surface treatment can be performed on the support surface 3221, such as anodizing; or, high-temperature resistant adhesive paper can be adhered to the support surface 3221. All three methods can make the melting point of the boss portion 3222 greater than the melting point of the body portion 321.

[0137] In some embodiments, combined with Figure 13 , Figure 14 , Figure 15 and Figure 16 As shown, the body portion 321 and the support boss 322 overlap and cooperate. This can be understood as follows: when the body portion 321 and the support boss 322 are separate parts, the overlap and cooperation between the body portion 321 and the support boss 322 can, to a certain extent, avoid the gap between the body portion 321 and the support boss 322, thereby improving the insulation performance of the first insulating member 320.

[0138] In some embodiments, combined with Figure 13 , Figure 14 , Figure 15 and Figure 16 As shown, a support boss 322 is located at the end of the body portion 321 along its length. The support boss 322 has a receiving groove 3224, and the end of the body portion 321 is located within the receiving groove 3224. This allows for an overlapping fit between the body portion 321 and the support boss 322, reducing the assembly difficulty of the support boss 322 and the body portion 321.

[0139] Meanwhile, by setting the receiving groove 3224 to achieve the overlapping and cooperation between the main body 321 and the support boss 322, the surfaces of the main body 321 and the support boss 322 facing the cover plate 310 can be located on the same plane, reducing the assembly difficulty of the first insulating member 320 and the cover plate 310.

[0140] In some embodiments, such as Figure 13 As shown, a first hot-melt post 3212 is provided on the side of the body portion 321 facing the cover plate 310. The first hot-melt post 3212 is used to connect the body portion 321 and the cover plate 310 together. A second hot-melt post 3226 is provided on the side of the support boss 322 facing the body portion 321. The second hot-melt post 3226 is used to connect the body portion 321 and the support boss 322 together. This achieves the mating connection between the first insulating member 320 and the cover plate 310, reduces the assembly difficulty of the first insulating member 320 and the cover plate 310, and ultimately realizes that the cover plate 310, the body portion 321 and the support boss 322 are integrated into a whole.

[0141] In some embodiments, such as Figure 13 As shown, multiple first hot-melt pillars 3212 and multiple second hot-melt pillars 3226 are provided. This is to improve the connection strength and reliability of the cover plate 310, the body part 321, and the support boss 322.

[0142] In some embodiments, such as Figure 3 As shown, the electrode assembly 200 is surrounded by an insulating layer 500, and the boss portion 3222 or the body portion 321 is fixedly connected to the insulating layer 500. By surrounding the electrode assembly 200 with the insulating layer 500, the insulating layer 500 can provide insulation protection for the electrode assembly 200, thereby improving the safety of the battery cell 1000.

[0143] Meanwhile, by fixing the boss portion 3222 or the body portion 321 to the insulating layer 500, the cover plate assembly 300 and the insulating layer 500 can be fixedly connected, so that the position of the cover plate assembly 300 and the insulating layer 500 is stable, which improves the working performance of the cover plate assembly 300 and the insulating layer 500 to a certain extent.

[0144] In some embodiments, the boss portion 3222 or the body portion 321 and the insulating layer 500 can be fixedly connected by thermofusion.

[0145] In some embodiments, combined with Figures 12-16As shown, a connecting boss 3211 is formed at the end of the main body 321. The connecting boss 3211 protrudes towards the electrode assembly 200. A boss portion 3222 is provided at the end of the main body 321 in the length direction and overlaps with the main body 321. The boss portion 3222 is provided with a relief groove 3225 to avoid the connecting boss 3211. The connecting boss 3211 is fixedly connected to the insulating layer 500. This achieves a fixed connection between the main body 321 and the insulating layer 500, reducing the difficulty of fixing the main body 321 and the insulating layer 500.

[0146] In some embodiments, such as Figure 13 As shown, the support boss 322 and the body part 321 are separate parts, and the melting point of the support boss 322 as a whole is greater than the melting point of the body part 321. This means that when the support boss 322 and the body part 321 are separate parts, the melting point of the entire support boss 322 is set to be greater than the melting point of the body part 321, so that the melting point of the support surface 3221 can be set to be greater than the melting point of the body part 321.

[0147] In some embodiments, the support boss 322 is made of PI so that the melting point of the support boss 322 as a whole is greater than the melting point of the body portion 321.

[0148] In other embodiments, the support boss 322 may also be made of PFA (Perfluoroalkoxy resin) or PET (Polyethylene Terephthalate) so that the melting point of the support boss 322 is greater than the melting point of the body portion 321.

[0149] It should be noted that the support boss 322 and the body part 321 can also be made of other materials, as long as the melting point of the support boss 322 is greater than the melting point of the body part 321. This application does not impose any restrictions on this.

[0150] In summary, the body portion 321 and the support boss 322 can be an integral part or separate parts. When the body portion 321 and the support boss 322 are an integral part, a second insulating member 400 can be provided on the side of the electrode assembly 200 facing the support boss 322, or a second insulating member 400 can be provided on the side of the support boss 322 facing the electrode assembly 200. When the body portion 321 and the support boss 322 are separate parts, the support boss 322 can be made of plastic, metal or insulating material with a high melting point. When the support boss 322 is made of plastic or metal, the support boss 322 includes a boss portion 3222 and a third insulating member 3223. The third insulating member 3223 is provided on the side of the boss portion 3222 facing the electrode assembly 200, and the melting point of the third insulating member 3223 is greater than the melting point of the body portion 321.

[0151] In some embodiments, such as Figure 13 As shown, the support bosses 322 include multiple support bosses 322, which are arranged sequentially at intervals along the length direction of the body portion 321. The melting point of the support surfaces 3221 near the two ends of the body portion 321 along the length direction is greater than the melting point of the body portion 321. By providing multiple support bosses 322, the multiple support bosses 322 can cooperate to enhance the support effect of the first insulating member 320 on the electrode assembly 200, thereby improving the positional stability of the electrode assembly 200 and thus improving the working performance of the electrode assembly 200.

[0152] It should be noted that when the battery cell 1000 experiences thermal runaway, the deformation of the cover plate 310 in the middle along its length will be relatively large. Also, because the explosion-proof valve 600 opens, the molten adhesive of the protrusion 3222 in the middle of the cover plate 310 will also be sprayed onto the outside of the battery cell 1000, which reduces the risk of the protrusion 3222 in the middle of the body 321 intruding into the electrode assembly 200.

[0153] Based on this, the melting point of the support surfaces 3221 at both ends of the length direction near the main body 321 is set to be greater than the melting point of the main body 321, which effectively prevents the electrode assembly 200 from short-circuiting when the support protrusion 322 intrudes into the electrode assembly 200, thereby preventing heat diffusion and improving the safety of the battery device 1100.

[0154] In some embodiments, the melting point of the support surface 3221 is ≥200°C; and / or, the melting point of the second insulating member 400 is ≥200°C. This is to ensure that the support boss 322 and / or the second insulating member 400 have high melting points, thereby making the melting points of the support boss 322 and / or the second insulating member 400 higher than the melting point of the body portion 321. In this way, when the battery cell 1000 expands and deforms due to heat, it can to a certain extent prevent the support boss 322 from intruding into the electrode assembly 200 and causing a short circuit in the electrode assembly 200.

[0155] In some embodiments, the support surface 3221 has a resistance ≥200 Mohm at 500V; and / or, the second insulating member 400 has a resistance ≥200 Mohm at 500V. This means that the support surface 3221 has a resistance ≥200 megohms at 500V, and / or the second insulating member 400 has a resistance ≥200 megohms at 500V, so that the support boss 322 and the second insulating member 400 have high insulation performance, which can, to a certain extent, prevent the electrode assembly 200 from short-circuiting when the support boss 322 intrudes into it.

[0156] In summary, the support boss 322 and / or the second insulating member 400 of this application not only have high melting points but also excellent insulation performance.

[0157] The battery device 1100 of this application according to the present invention will now be described with reference to the accompanying drawings.

[0158] like Figure 2 As shown, the battery device 1100 of this application embodiment includes the battery cell 1000 of the above embodiment.

[0159] Since the battery cell 1000 of this application embodiment has the above-mentioned technical effects, the battery device 1100 of this application embodiment also has the above-mentioned technical effects. That is, by adopting the battery cell 1000 of this application, the safety of use of the battery device 1100 can be improved to a certain extent, and the service life of the battery device 1100 can be extended.

[0160] The following description of an embodiment of the electrical device 2000 of this application is based on the accompanying drawings.

[0161] Combination Figure 1 and Figure 2 As shown, the power-consuming device 2000 of this application embodiment includes the battery cell 1000 or the battery device 1100 of the above embodiment, and the battery cell 1000 or the battery device 1100 is used to store or provide electrical energy.

[0162] Since the battery cell 1000 and battery device 1100 of the present application have the above-mentioned technical effects, the power device 2000 of the present application also has the above-mentioned technical effects. That is, by adopting the battery cell 1000 or battery device 1100 of the present application, while ensuring the working performance of the power device 2000, the safety of the power device 2000 can be improved and the service life of the power device 2000 can be extended.

[0163] It is understood that other configurations of the battery cell 1000, battery device 1100, and power consumption device 2000 according to the embodiments of this application are known to those skilled in the art and will not be described in detail here.

[0164] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0165] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, characterized in that, include: A housing (100) defines a receiving cavity with an open opening; An electrode assembly (200) is disposed within the receiving cavity; A cover plate assembly (300) includes a cover plate (310) and a first insulating member (320). The cover plate (310) is disposed on the housing (100) to cover the opening. The first insulating member (320) includes a body portion (321) and at least one support boss (322). The body portion (321) is disposed between the cover plate (310) and the electrode assembly (200). At least one support boss (322) is disposed on the side of the body portion (321) facing the electrode assembly (200). The support boss (322) has a support surface (3221) that supports the electrode assembly (200). The first insulating member (320) is configured such that at least the melting point of the support surface (3221) is greater than the melting point of the body portion (321). and / or The electrode assembly (200) has a second insulating member (400) at least in contact with the support surface (3221), and the melting point of the second insulating member (400) is greater than the melting point of the body part (321).

2. The battery cell according to claim 1, characterized in that, The support boss (322) includes a boss portion (3222) and a third insulating member (3223). The boss portion (3222) is disposed on the body portion (321), and the third insulating member (3223) is disposed on the side of the boss portion (3222) facing the electrode assembly (200). The third insulating member (3223) at least defines the support surface (3221), and the melting point of the third insulating member (3223) is greater than the melting point of the body portion (321).

3. The battery cell according to claim 2, characterized in that, The third insulating element (3223) is wrapped around the outer periphery of the boss portion (3222).

4. The battery cell according to claim 2, characterized in that, The third insulating element (3223) is an insulating film coated on the boss portion (3222).

5. The battery cell according to any one of claims 2-4, characterized in that, The boss (3222) is a metal part.

6. The battery cell according to claim 1, characterized in that, The support boss (322) and the body part (321) are separate parts, and the melting point of the support boss (322) is greater than the melting point of the body part (321).

7. The battery cell according to claim 6, characterized in that, The main body (321) and the supporting boss (322) are engaged in a joint.

8. The battery cell according to claim 7, characterized in that, The support boss (322) is located at the end of the body part (321) along its length. The support boss (322) is provided with a receiving groove (3224), and the end of the body part (321) is located in the receiving groove (3224).

9. The battery cell according to claim 5, characterized in that, The electrode assembly (200) is surrounded by an insulating layer (500), and the boss portion (3222) or the body portion (321) is fixedly connected to the insulating layer (500).

10. The battery cell according to claim 9, characterized in that, The end of the body part (321) is formed with a connecting boss (3211), which protrudes toward the electrode assembly (200). The boss part (3222) is located at the end of the body part (321) in the length direction and overlaps with the body part (321). The boss part (3222) is provided with a relief groove (3225) to avoid the connecting boss (3211). The connecting boss (3211) is fixedly connected to the insulating layer (500).

11. The battery cell according to claim 1, characterized in that, The support boss (322) and the body part (321) are separate parts, and the melting point of the support boss (322) as a whole is greater than the melting point of the body part (321).

12. The battery cell according to claim 1, characterized in that, The support boss (322) includes a plurality of support bosses (322), which are arranged sequentially at intervals along the length direction of the body part (321). The melting point of the support surface (3221) near both ends of the length direction of the body part (321) is greater than the melting point of the body part (321).

13. The battery cell according to any one of claims 1-12, characterized in that, The melting point of the support surface (3221) is ≥200°C; and / or the melting point of the second insulating element (400) is ≥200°C.

14. The battery cell according to any one of claims 1-13, characterized in that, The support surface (3221) satisfies a resistance ≥200 Mohm at 500V; and / or, the second insulating element (400) satisfies a resistance ≥200 Mohm at 500V.

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

16. An electrical appliance, characterized in that, Includes a battery cell according to any one of claims 1-14 or a battery device according to claim 15, wherein the battery cell or the battery device is used to store or provide electrical energy.

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