Battery cell, battery apparatus, and electrical apparatus

Abstract

The present application discloses a battery cell, a battery apparatus, and an electrical apparatus. The battery cell comprises a casing, an electrode assembly, an electrode terminal, a first insulating member, and a second insulating member. The casing is provided with a first side wall and an accommodating cavity, and the first side wall is provided with a first through hole in communication with the accommodating cavity. At least a part of the electrode assembly is arranged in the accommodating cavity. The electrode terminal is electrically connected to the electrode assembly by means of the first through hole. The first insulating member is arranged between the electrode terminal and the first side wall to insulate and separate the electrode terminal from the first side wall. The second insulating member is arranged between at least a part of the first insulating member and the electrode terminal, and / or the second insulating member is arranged between at least a part of the first insulating member and the first side wall. The heat resistance of the second insulating member is greater than the heat resistance of the first insulating member.

Description

Battery cells, battery packs and electrical devices Technical Field

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

[0002] Battery cells 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] The casing of a battery cell has electrode terminals to facilitate the input and output of electrical energy. These terminals are insulated from the casing to reduce the risk of short circuits. The reliability of this insulation between the terminals and the casing directly affects the overall reliability of the battery cell. Improving the reliability of battery cells is a crucial research direction in the field of battery technology.

[0004] The above statements are for the purpose of providing background information in relation to this application only and do not necessarily constitute prior art.

[0005] Application content

[0006] The purpose of this application is to provide a battery cell, a battery device, and an electrical device that can improve the reliability of the battery cell.

[0007] The technical solution adopted in the embodiments of this application is:

[0008] In a first aspect, a battery cell is provided, the battery cell including a casing, an electrode assembly, electrode terminals, a first insulating member and a second insulating member, the casing having a first sidewall and a receiving cavity, the first sidewall having a first through hole communicating with the receiving cavity; at least a portion of the electrode assembly is disposed within the receiving cavity; the electrode terminals are electrically connected to the electrode assembly through the first through hole; the first insulating member is disposed between the electrode terminals and the first sidewall to insulatingly separate the electrode terminals and the first sidewall; at least a portion of the first insulating member is provided with a second insulating member between it and the electrode terminals, and / or at least a portion of the first insulating member is provided with a second insulating member between it and the first sidewall; wherein the heat resistance of the second insulating member is greater than the heat resistance of the first insulating member.

[0009] By adopting the technical solution of this embodiment, the electrode assembly is installed in the housing. The housing includes a first sidewall with a first through hole. The electrode assembly is electrically connected to the electrode assembly through the first through hole. A first insulating member is provided between the electrode terminal and the first sidewall. At least a portion of the first insulating member is provided between the electrode terminal and / or between at least a portion of the first insulating member and the first sidewall, so that the first and second insulating members can insulate the electrode terminal and the first sidewall, thereby achieving stable input or output of electrical energy from the battery cell. Since the heat resistance of the second insulating member is greater than that of the first insulating member, in the event of overheating of the electrode terminal or thermal runaway of the battery cell, or softening or melting of the first insulating member, the second insulating member can maintain a stable structural form. The second insulating member insulates the first sidewall and the electrode terminal, reducing the risk of short circuit between the first sidewall and the electrode terminal and improving the reliability of the battery cell.

[0010] In some embodiments, the melting point of the second insulating element is greater than that of the first insulating element.

[0011] By adopting the technical solution of this embodiment, when the temperature at the electrode terminal exceeds the melting point of the first insulating component, the first insulating component softens or melts, but does not reach the melting point of the second insulating component. The second insulating component has a stable structural form, thereby stably isolating the electrode terminal and the first sidewall, reducing the short-circuit risk of the battery cell, and improving the reliability of the battery cell.

[0012] In some embodiments, the thermal weight loss temperature of the second insulating element is greater than that of the first insulating element.

[0013] By adopting the technical solution of this embodiment, when the temperature at the electrode terminal exceeds the thermal weight loss temperature of the first insulating component, the first insulating component softens or melts, but does not reach the thermal weight loss temperature of the second insulating component. The second insulating component has a stable structural form, thereby stably isolating the electrode terminal and the first sidewall, reducing the short circuit risk of the battery cell, and improving the reliability of the battery cell.

[0014] In some embodiments, the melting point or thermal weight loss temperature of the second insulating element is greater than or equal to 300°C; optionally, the melting point or thermal weight loss temperature of the second insulating element is greater than or equal to 500°C; optionally, the melting point or thermal weight loss temperature of the second insulating element is greater than or equal to 700°C.

[0015] By adopting the technical solution of this embodiment, when the first insulating component is in a softened or molten state, the second insulating component has a stable structural form, thereby insulatingly separating the first sidewall and the electrode terminal.

[0016] In some embodiments, the resistivity of the second insulating element is greater than or equal to 1*10⁻⁶. 12Ω·cm.

[0017] By adopting the technical solution of this embodiment, the second insulating component has good insulation performance. When the first insulating component softens or melts, the second insulating component can stably insulate and separate the first sidewall and the electrode terminal, reducing the risk of short circuit in the battery cell and improving the reliability of the battery cell.

[0018] In some embodiments, the first sidewall includes a first surface, the outer surface of the electrode terminal includes a second surface, the first surface and the second surface are disposed opposite to each other, and at least a portion of the first insulating member and at least a portion of the second insulating member are located between the first surface and the second surface.

[0019] By adopting the technical solution of this embodiment, when the first insulating member softens and melts, the second insulating member can insulate and separate the first sidewall and the first and second surfaces of the electrode terminals that are opposite to each other, thereby achieving insulation between the electrode terminals and the first sidewall.

[0020] In some embodiments, a second insulating member is provided between the first insulating member and the first sidewall, the second insulating member covering at least a portion of the first surface.

[0021] By adopting the technical solution of this embodiment, the second insulating member covers the first surface of the housing. When the first insulating member softens or melts, the second insulating member can insulate and separate the first surface of the electrode terminal from the second surface of the first sidewall, thereby insulating the electrode terminal from the first sidewall.

[0022] In some embodiments, the second insulating member includes a first insulator portion, and the first surface includes a plurality of first covering surfaces, at least a portion of which covers the first insulator portion.

[0023] By adopting the technical solution of this embodiment, when the first insulating component softens and melts, the first insulator portion covers the first covering surface. The first insulator portion is located between the electrode terminal and the first sidewall, which can insulate and separate the first sidewall and the electrode terminal.

[0024] In some embodiments, the thickness of the first insulator portion is T1, wherein 5μm≤T1≤100μm, and optionally, 10μm≤T1≤30μm.

[0025] By adopting the technical solution of this embodiment, when the first insulating component softens and melts, the first insulator portion can insulatingly separate the first sidewall and the electrode terminal; in addition, it can also reduce the space occupied by the first insulator portion, reduce material waste, and reduce the manufacturing difficulty of the first insulator portion. Therefore, it can better balance the insulation between the electrode terminal and the first sidewall and the structural compactness of the battery cell.

[0026] In some embodiments, a plurality of first covering surfaces include a first surface, a second surface, and a third surface, the first surface being disposed away from the electrode assembly, the third surface being disposed towards the electrode assembly, the second surface being connected between the first surface and the second surface, and the second surface being configured to form a first through hole; at least one of at least a portion of the first surface, at least a portion of the second surface, and at least a portion of the third surface is covered with a first insulator portion.

[0027] By adopting the technical solution of this embodiment, when the first insulating component softens and melts, the first insulator portion is located between the electrode terminal and the first sidewall, which can insulate and separate the first sidewall and the electrode terminal.

[0028] In some embodiments, the outer surface of the electrode terminal is covered with a second insulating member, the second insulating member including a first insulating portion that covers at least a portion of the second surface.

[0029] By adopting the technical solution of this embodiment, when the first insulating part softens and melts, the first insulating part is located between the second surface and the first sidewall, which can insulate and separate the first sidewall and the electrode terminal; in addition, the electrode terminal has a simple structure, and the process of setting the second insulating part on its outer surface is simple and convenient to process and manufacture.

[0030] In some embodiments, the area of ​​the outer surface of the electrode terminal is S1, and the coverage area of ​​the electrode terminal covered by the second insulating member is S2, wherein 0.35≤S2 / S1≤0.85, and optionally, 0.45≤S2 / S1≤0.75.

[0031] By adopting the technical solution of this embodiment, the electrode terminals are covered with a second insulating member, thereby enabling the electrode terminals and the first sidewall to be insulated and separated when the first insulating member softens or melts. A portion of the electrode terminals can flow out for electrical connection with the busbar and electrode assembly, improving the connection reliability between the electrode terminals, the busbar and the electrode assembly, and improving the performance of the battery cell. Therefore, the insulation between the electrode terminals and the first sidewall, as well as the connection reliability between the electrode terminals, the busbar and the electrode assembly, can be simultaneously ensured.

[0032] In some embodiments, the second insulating member includes a second insulating portion, the outer surface of the electrode terminal includes a first end face, the first end face is disposed away from the electrode assembly, and at least a portion of the first end face is covered by the second insulating portion.

[0033] By adopting the technical solution of this embodiment, the first end face of the electrode terminal is covered with a second insulating part, which can increase the insulating area of ​​the electrode terminal, improve the insulation effect of the electrode terminal, and improve the reliability of the battery cell.

[0034] In some embodiments, the first end face includes a first portion and a second portion, the first portion being used for electrical connection with a busbar component, the second portion not being used for electrical connection with a busbar component, the first portion not being covered by a second insulating portion, and at least a portion of the second portion being covered by a second insulating portion.

[0035] By adopting the technical solution of this embodiment, the first part is not covered by the second insulating part, which can reduce the impact of the second insulating part on the electrical connection between the busbar and the first part, and is beneficial to the connection reliability of the battery cell; the second part is at least partially covered by the second insulating part, which can increase the insulation area of ​​the electrode terminal, increase the insulation performance of the electrode terminal, reduce the short circuit risk of the battery cell, and is beneficial to improving the reliability of the battery cell.

[0036] In some embodiments, the electrode terminal further includes an end body and a cap. The end body is electrically connected to the electrode assembly and passes through a first through hole. The end face of the end body facing away from the electrode assembly includes a recessed portion and a planar portion. The recessed portion is recessed relative to the planar portion toward the electrode assembly to form a recessed space. At least a portion of the cap is installed in the recessed space. The side face of the cap facing away from the electrode assembly and the planar portion together form a first end face.

[0037] By adopting the technical solution of this embodiment, the electrode terminal adopts the structure of an end body and a cap body, which makes it convenient to set the liquid injection hole on the electrode terminal, which helps to simplify the structure of the battery cell and improve the reliability of the battery cell.

[0038] In some embodiments, a first portion is formed on the side of the cap facing away from the electrode assembly, and a second portion is formed on the flat side; or, the first portion is formed on the flat side, and the second portion is formed on the side of the cap facing away from the electrode assembly.

[0039] By adopting the technical solution of this embodiment, the busbar component can be electrically connected to the cap body or the end body, and the connection between the busbar component and the electrode terminal can be flexibly set to meet different usage requirements; in addition, no second insulating part is provided between the busbar component and the electrode terminal, which can reduce the influence of the second insulating part on the electrical connection between the busbar component and the electrode terminal, which is beneficial to improving the performance of the battery cell's power input or output.

[0040] In some embodiments, the thickness of the second insulating portion is T2, wherein 0 < T2 ≤ 100 μm, and optionally, 0 < T2 ≤ 30 μm.

[0041] By adopting the technical solution of this embodiment, the first end face can be covered with the second insulating portion, which increases the insulation area of ​​the electrode terminal, improves the insulation performance of the electrode terminal, and is beneficial to improving the reliability of the battery cell. In addition, it can also reduce the space occupied by the second insulating portion, reduce material waste, and reduce the manufacturing difficulty of the second insulating portion. Therefore, it can better balance the insulation performance of the electrode terminal and the structural compactness of the battery cell.

[0042] In some embodiments, the first insulating portion includes a second insulating portion, and the second surface includes a plurality of second covering surfaces, at least a portion of which covers the second insulating portion.

[0043] By adopting the technical solution of this embodiment, when the first insulating member softens and melts, the second insulator portion covers the second covering surface. The second insulator portion is located between the electrode terminal and the first sidewall, which can insulate and separate the first sidewall and the electrode terminal.

[0044] In some embodiments, the thickness of the second insulator portion is T3, wherein 5μm≤T3≤100μm, and optionally, 10μm≤T3≤30μm.

[0045] By adopting the technical solution of this embodiment, when the first insulating component softens and melts, the second insulator can insulatingly separate the first sidewall and the electrode terminal. Furthermore, it reduces the space occupied by the second insulator, minimizes material waste, and reduces the manufacturing difficulty of the second insulator. Therefore, it effectively balances the insulation between the electrode terminal and the first sidewall with the structural compactness of the battery cell.

[0046] In some embodiments, the plurality of second covering surfaces include a fourth surface, a fifth surface, and a sixth surface; the electrode terminal includes a first limiting portion, a second limiting portion, and a connecting portion connected between the first limiting portion and the second limiting portion; the connecting portion passes through a first through hole, the first limiting portion is located on the side of the first sidewall facing away from the electrode assembly, and the second limiting portion is located within the receiving cavity; the first limiting portion protrudes from the outer peripheral surface of the connecting portion and forms a first limiting protrusion, the second limiting portion protrudes from the outer peripheral surface of the connecting portion and forms a second limiting protrusion, and a portion of the first sidewall is located between the first limiting portion and the second limiting portion; the outer peripheral surface of the connecting portion forms a fifth surface, the side of the first limiting protrusion facing the electrode assembly forms a fourth surface, and the side of the second limiting protrusion facing away from the electrode assembly forms a sixth surface.

[0047] By adopting the technical solution of this embodiment, the electrode terminals can be fixed by using the first limiting protrusion and the second limiting protrusion of the electrode terminals. The structure is simple and convenient for the assembly of battery cells.

[0048] In some embodiments, at least a portion of the fourth side is covered by the second insulator portion.

[0049] By adopting the technical solution of this embodiment, when the first insulating member softens or melts, the second insulator portion covering the fourth surface can be located between the fourth surface and the first sidewall, thereby insulating and separating the first sidewall and the electrode terminal.

[0050] In some embodiments, the thickness of the second insulator portion covering the fourth surface is T4, and the size of the first limiting protrusion along the axial direction of the first through hole is T5, wherein 0.005≤T4 / T5≤0.2.

[0051] By adopting the technical solution of this embodiment, under a fixed T5, the design of T4 / T5≥0.005 ensures that when the first insulating component softens and melts, the second insulator can insulatingly separate the fourth surface from the first sidewall, achieving insulation between the electrode terminal and the first sidewall. Furthermore, the design of T4 / T5≤0.2 reduces the space occupied by the second insulator, minimizing material waste. Therefore, it effectively balances the insulation between the electrode terminal and the first sidewall with the structural compactness of the battery cell.

[0052] In some embodiments, at least a portion of the fifth side is covered by the second insulator portion.

[0053] By adopting the technical solution of this embodiment, when the first insulating member softens or melts, the second insulator portion covering the fifth surface can be located between the fifth surface and the first sidewall, thereby insulating and separating the first sidewall from the electrode terminal.

[0054] In some embodiments, the thickness of the second insulator portion covering the fifth surface is T6, and the radial dimension of the connection portion is D1, wherein 0.0003≤T6 / (D1+2T6)≤0.05.

[0055] By adopting the technical solution of this embodiment, under the condition of a fixed (D1+2T6), the design of T6 / (D1+2T6)≥0.0003 ensures that when the first insulating component softens and melts, the second insulator can insulatingly separate the fifth surface from the first sidewall, achieving insulation between the electrode terminal and the first sidewall. Furthermore, the design of T6 / (D1+2T6)≤0.05 reduces the space occupied by the second insulator, increases the radial dimension of the connection, improves the current-carrying capacity of the connection, and enhances the fast-charging performance of the battery cell. Therefore, it can effectively balance the insulation between the electrode terminal and the first sidewall with the fast-charging performance of the battery cell.

[0056] In some embodiments, at least a portion of the sixth side is covered by the second insulator portion.

[0057] By adopting the technical solution of this embodiment, when the first insulating member softens or melts, the second insulator portion covering the sixth surface can be located between the sixth surface and the first sidewall, thereby insulating and separating the first sidewall from the electrode terminal.

[0058] In some embodiments, the thickness of the second insulator portion covering the sixth surface is T7, and the size of the second limiting protrusion along the axial direction of the first through hole is T8, wherein 0.005≤T7 / T8≤0.2.

[0059] By adopting the technical solution of this embodiment, under a fixed T8, the design of T7 / T8≥0.005 ensures that when the first insulating component softens and melts, the second insulator can insulatingly separate the sixth surface from the first sidewall, achieving insulation between the electrode terminal and the first sidewall. Furthermore, the design of T7 / T8≤0.2 reduces the space occupied by the second insulator, minimizing material waste. Therefore, it effectively balances the insulation between the electrode terminal and the first sidewall with the structural compactness of the battery cell.

[0060] In some embodiments, the second insulating member includes a first insulator portion, and the first surface includes a plurality of first covering surfaces, the plurality of first covering surfaces including a first surface, a second surface and a third surface. Along the axial direction of the first through hole, the first surface is disposed away from the electrode assembly, the third surface is disposed towards the electrode assembly, and the second surface is connected between the first surface and the second surface, and the second surface surrounds to form the first through hole; at least a portion of the first surface covers the first insulator portion, and along the direction from the fifth surface to the second surface, the first insulator portion covering the first surface protrudes from the side of the first limiting protrusion away from the fifth surface; and / or, at least a portion of the third surface covers the first insulator portion, and along the direction from the fifth surface to the second surface, the first insulator portion covering the third surface protrudes from the side of the second limiting protrusion away from the fifth surface.

[0061] By adopting the technical solution of this embodiment, when the first insulating component softens or melts, the first insulator portion can better insulate and separate the electrode terminal and the first sidewall, which is beneficial to improving the insulation reliability of the electrode terminal and the first sidewall.

[0062] In some embodiments, the first insulating member includes a first insulating region, a second insulating region, and a third insulating region connected together, with at least a portion of the first insulating region located between a first surface and a fourth surface, the second insulating region located between a second surface and a fifth surface, and at least a portion of the third insulating region located between a third surface and a sixth surface.

[0063] By adopting the technical solution of this embodiment, the fourth surface of the electrode terminal is insulated from the first surface of the first sidewall by a first insulating region, the fifth surface of the electrode terminal is insulated from the second surface of the first sidewall by a second insulating region, and the sixth surface of the electrode terminal is insulated from the third surface of the first sidewall by a third insulating region. This achieves three-sided insulation between the electrode terminal and the first sidewall, which is beneficial to improving the insulation effect between the electrode terminal and the first sidewall and improving the reliability of the battery cell.

[0064] In some embodiments, at least a portion of the first surface is covered by a first insulator portion, and in the direction from the fifth surface to the second surface, the first insulator portion covering the first surface protrudes from the side of the first insulating region away from the fifth surface; and / or, at least a portion of the third surface is covered by a first insulator portion, and in the direction from the fifth surface to the second surface, the first insulator portion covering the third surface protrudes from the side of the third insulating region away from the fifth surface.

[0065] By adopting the technical solution of this embodiment, when the first insulating component softens or melts, the first insulator portion can better insulate and separate the electrode terminal and the first sidewall, which is beneficial to improving the insulation reliability of the electrode terminal and the first sidewall.

[0066] In some embodiments, the second insulating member includes a third insulating portion, and at least a portion of the side of the first limiting protrusion away from the fifth surface is covered by the third insulating portion along the radial direction of the first through hole; and / or, the second insulating member includes a fourth insulating portion, and at least a portion of the side of the second limiting protrusion away from the fifth surface is covered by the fourth insulating portion along the radial direction of the first through hole.

[0067] By adopting the technical solution of this embodiment, when the first insulating component softens or melts, the second insulating component can better insulate and separate the electrode terminal and the first sidewall, which is beneficial to improving the insulation reliability of the electrode terminal and the first sidewall.

[0068] In some embodiments, the second insulating member includes a fifth insulating portion, the electrode terminal has a second end face along the axial direction of the first through hole, the second end face is disposed toward the electrode assembly, the second end face includes a third portion and a fourth portion, the electrode assembly is connected to the third portion, the fourth portion is not electrically connected to the electrode assembly, and the fourth portion is covered by the fifth insulating portion.

[0069] By adopting the technical solution of this embodiment, the third part is not covered by the fifth insulating part, which can reduce the impact of the fifth insulating part on the electrical connection between the electrode assembly and the electrode terminal, and is conducive to improving the connection reliability of the electrode assembly and the electrode terminal; the fourth part is covered by the fifth insulating part, which can increase the insulation performance of the electrode terminal, reduce the short circuit risk of the battery cell, and is conducive to improving the reliability of the battery cell.

[0070] In some embodiments, the thickness of the fifth insulating portion is T9, wherein 0 < T9 ≤ 30 μm, and optionally, 0 < T9 ≤ 15 μm.

[0071] By adopting the technical solution of this embodiment, the second end face can be covered with the fifth insulating portion, which increases the insulation area of ​​the electrode terminal and improves the insulation performance of the electrode terminal, thus improving the reliability of the battery cell. Furthermore, it reduces the space occupied by the fifth insulating portion, reduces material waste and the manufacturing difficulty of the fifth insulating portion, and because the fifth insulating portion is thin and easily damaged, it facilitates the welding of the electrode terminals and electrode assembly tabs. Therefore, it can better balance the insulation performance of the electrode terminals, the structural compactness of the battery cell, and the electrical connection between the electrode assembly and the electrode terminals.

[0072] In some embodiments, the electrode terminal is an aluminum terminal, and the outer surface of the electrode terminal is formed into a second insulating element by an oxidation process or a nitriding process.

[0073] By adopting the technical solution of this embodiment, the electrode terminal is made of aluminum, and the second insulating component is made by the surface of the electrode terminal through an oxidation process or a nitriding process. The processing method is simple and helps to reduce the manufacturing cost of the electrode terminal.

[0074] In some embodiments, the material of the second insulating element includes at least one selected from Al2O3, ZrO2, MgSiO3, AlN, BN, SiC, and thermosetting polyimide.

[0075] By adopting the technical solution of this embodiment, the second insulating component uses the above-mentioned material, which can insulate and separate the first sidewall and the electrode terminal when the first insulating component softens or melts, thereby improving the reliability of the battery cell.

[0076] In some embodiments, the housing includes an end cap and a housing, the housing enclosing a receiving cavity, the end cap covering an opening in the receiving cavity, and a sidewall of the housing opposite to the end cap forming a first sidewall.

[0077] By adopting the technical solution of this embodiment, the electrode terminals are located on the housing, which can increase the overall structural stability of the battery cell and improve the reliability of the battery cell.

[0078] In some embodiments, the electrode assembly includes a body and a first electrode tab and a second electrode tab with different polarities. The first electrode tab extends from the end of the body facing the end cap, and the second electrode tab extends from the end of the body facing the first sidewall. The first electrode tab is electrically connected to the end cap, and the second electrode tab is electrically connected to the electrode terminal.

[0079] By adopting the technical solution of this embodiment, the first tab is electrically connected to the end cap, so that the end cap or the housing can serve as one output pole of the battery cell. The second tab is electrically connected to the electrode terminal, so that the electrode terminal serves as the other output pole of the battery cell. The first insulating member and the second insulating member can separate the electrode terminal and the housing with double insulation, which can better improve the insulation reliability of the electrode terminal and the housing, and better reduce the short circuit risk of the battery cell, thus improving the reliability of the battery cell. In addition, the end cap and the housing serve as the output poles of the battery cell, which can facilitate the electrical connection between battery cells, simplify the structure of the battery cell, and facilitate processing and manufacturing.

[0080] In some embodiments, the battery cell is a cylindrical battery cell or a prismatic battery cell.

[0081] The technical solutions of this application embodiment can be applied to cylindrical battery cells and prismatic battery cells, and have a wide range of applications.

[0082] Secondly, a battery device is provided, comprising a plurality of the aforementioned battery cells.

[0083] The battery device in this application uses the aforementioned battery cell, which has good reliability, thus improving the reliability of the battery device.

[0084] Thirdly, an electrical device is provided, including the aforementioned battery cell or battery device, wherein the battery cell or battery device is used to store or provide electrical energy.

[0085] The electrical device in this application uses the aforementioned battery cell or battery device. The battery cell and battery device have good reliability, which helps to improve the reliability of the electrical device.

[0086] 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

[0087] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0088] Figure 1 is a schematic diagram of the structure of a battery cell provided in some embodiments of this application.

[0089] Figure 2 is a cross-sectional schematic diagram of a battery cell provided in some embodiments of this application.

[0090] Figure 3 is a magnified view of part A in Figure 2.

[0091] Figure 4 is a magnified view of part B in Figure 3.

[0092] Figure 5 is an exploded view of a battery device provided in some embodiments of this application.

[0093] Figure 6 is a structural schematic diagram of a vehicle provided in some embodiments of this application.

[0094] In the figures, the following reference numerals are used: 100, battery cell; 10, casing; 101, first sidewall; 1011, first through hole; 1012, first surface; 10121, first covering surface; 10122, first surface; 10123, second surface; 10124, third surface; 102, receiving cavity; 11, end cap; 12, housing; 20, electrode assembly; 21, body; 22, first electrode tab; 23, second electrode tab; 30, electrode terminal; 301, second surface; 3011, second covering surface; 3012, fourth surface; 3013, fifth surface; 3014, sixth surface; 302, first end face; 3021, first part; 3022, second part; 303, second end face; 3031, third part; 3032, fourth part; 31, end body; 311, first limiting part; 3111. 312. First limiting protrusion; 312. Second limiting part; 3121. Second limiting protrusion; 313. Connecting part; 3101. Recessed part; 3102. Flat part; 3103. Recessed space; 3104. Injection hole; 32. Cap body; 40. First insulating component; 41. First insulating area; 42. Second insulating area; 43. Third insulating area; 50. Second insulating component; 51. First insulator part; 52. First insulating part; 521. Second insulator part; 53. Second insulating part; 54. Third insulating part; 55. Fourth insulating part; 56. Fifth insulating part; 61. First conductive component; 62. Second conductive component; 200. Housing; 210. First housing; 220. Second housing; 1000. Vehicle; 1100. Battery device; 1200. Controller; 1300. Motor. Detailed Implementation

[0095] 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.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] 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.

[0101] In this application, "multiple" means two or more (including two).

[0102] A single battery cell can be a rechargeable battery, which refers to a battery cell that can be recharged after being discharged to activate the active materials and continue to be used.

[0103] A battery device can refer to a single physical module that includes one or more battery cells to provide higher voltage and capacity.

[0104] A single battery cell typically includes an electrode assembly and a housing for containing the electrode assembly. The electrode assembly typically includes a positive electrode, a negative electrode, and a separator that separates the positive and negative electrodes.

[0105] The outer casing is equipped with electrode terminals. One end of the electrode terminal is electrically connected to the electrode assembly, and the other end of the electrode terminal is electrically connected to the external circuit to realize the output or input of electrical energy of the battery cell. The electrode terminals and the outer casing are usually insulated and separated by a first insulating component (e.g., a plastic component). However, if overheating occurs at the electrode terminals or thermal runaway occurs in the battery cell, the first insulating component is prone to softening or melting, causing the electrode terminals to overlap with the outer casing, resulting in a short circuit in the battery cell and seriously affecting the reliability of the battery cell.

[0106] In view of this, the present application provides a technical solution in which a second insulating member is provided between at least a portion of the first insulating member and the outer shell or between at least a portion of the first insulating member and the electrode terminal. The heat resistance of the second insulating member is greater than that of the first insulating member. In the event of melting or molten state of the first insulating member, the second insulating member can have a stable structural form. The second insulating member insulates and separates the electrode terminal and the outer shell, reduces the risk of electrode terminal and outer shell contact, improves the insulation reliability of electrode terminal and outer shell under overheating or thermal runaway state, reduces the short circuit risk of battery cell, and improves the reliability of battery cell use.

[0107] Referring to Figures 1 and 2, an embodiment of this application provides a battery cell 100, which includes a housing 10 and an electrode assembly 20, at least a portion of which is housed within the housing 10.

[0108] The outer casing 10 may be a hollow structure, with an internal space for accommodating the electrode assembly 20 and the electrolyte. Exemplarily, the outer casing 10 of the battery cell 100 is a cylindrical casing.

[0109] In some embodiments, the housing 10 may be a metal housing, such as a steel housing, an aluminum housing, a composite metal housing (e.g., a copper-aluminum composite housing), or other metal housings. Alternatively, the housing 10 may also be a non-metallic housing, such as a plastic housing (e.g., polypropylene).

[0110] In some embodiments, the housing 10 includes a housing 12 and an end cap 11. The housing 12 has an opening, and the end cap 11 is connected to the housing 12 and closes the opening. The housing 12 is a component used to cooperate with the end cap 11 to form an internal cavity of the battery cell 100. The formed internal cavity can be used to accommodate the electrode assembly 20, the electrolyte, and other components.

[0111] The housing 12 and the end cap 11 can be separate components. For example, an opening can be provided on the housing 12, and the end cap 11 can be used to close the opening to form an internal cavity of the battery cell 100.

[0112] The shell 12 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0113] The shape of the end cap 11 can be adapted to the shape of the housing 12 to fit the housing 12. The material of the end cap 11 can be the same as or different from the material of the housing 12. Optionally, the end cap 11 can be made of a material with a certain hardness and strength (such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.), so that the end cap 11 is not easily deformed when subjected to compression and impact, so that the battery cell 100 can have higher structural strength and improve reliability.

[0114] The end cap 11 is connected to the housing 12 by welding, bonding, snap-fitting or other means.

[0115] The housing 12 may be open at one end or open at both ends. In some examples, the housing 12 may be a structure with an opening on one side, with one end cap 11 covering the housing 12. In other examples, the housing 12 may be a structure with openings on both sides, with two end caps 11 covering the two openings of the housing 12 respectively.

[0116] Electrode assembly 20 is a component in the battery cell 100 where electrochemical reactions occur. Electrode assembly 20 can be entirely housed within housing 10 or partially housed within housing 10. For example, a portion of the tabs of electrode assembly 20 can extend outside housing 10.

[0117] Optionally, the electrode assembly 20 is entirely housed within the housing 10.

[0118] In some embodiments, the electrode assembly 20 includes a positive electrode and a negative electrode. During the charging and discharging of the battery cell 100, active ions (e.g., lithium ions) are inserted and extracted back and forth between the positive and negative electrode.

[0119] In some embodiments, the positive electrode sheet may include a positive current collector and a positive active material layer disposed on at least one surface of the positive current collector. The portion of the positive current collector covered by the positive active material layer and the positive active material layer together form a positive electrode body, and the portion of the positive current collector not covered by the positive active material layer forms a positive electrode tab.

[0120] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material layer is disposed on either or both of the two opposite surfaces of the positive current collector.

[0121] As an example, the positive current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, nickel alloys, titanium, or silver. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0122] As an example, the positive electrode active material layer includes a positive electrode active material, which may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium manganese iron phosphate, and lithium manganese iron phosphate and carbon composites. Examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM) 622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.8 Co 0.15 Al0.05 (O2) and at least one of its modified compounds. Modified compounds refer to substances obtained by modification methods such as doping or coating based on the above-mentioned substances.

[0123] In some embodiments, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material layer disposed on at least one surface of the negative electrode current collector. The portion of the negative electrode current collector covered by the negative electrode active material layer and the negative electrode active material layer form a negative electrode body portion, and the portion of the negative electrode current collector not covered by the negative electrode active material layer forms a negative electrode tab.

[0124] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material layer is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0125] As an example, the negative electrode current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, nickel alloys, titanium, or silver. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0126] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cell 100. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials for battery cell 100 may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0127] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0128] In some embodiments, the electrode assembly 20 further includes a separator disposed between the positive and negative electrode plates. The separator serves to prevent short circuits between the positive and negative electrodes while allowing active ions to pass through.

[0129] In some embodiments, the separator is a separator membrane. The separator membrane in this application can be any known porous structure separator membrane with good chemical and mechanical stability.

[0130] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different. The separator can be a separate component located between the positive and negative electrode plates, or it can be attached to the surface of the positive or negative electrode plate. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can also be applied to the surface of the separator.

[0131] In some embodiments, the battery cell 100 further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte used in this application can be selected as needed. The electrolyte can be liquid, gel, or solid.

[0132] In some embodiments, the liquid electrolyte includes an electrolyte salt and a solvent.

[0133] In some embodiments, the electrolyte salt may be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0134] In some embodiments, the solvent may be selected from at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0135] In some embodiments, the electrolyte may optionally include additives. For example, the additives may include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve certain properties of the cylindrical battery cell 100, such as additives that improve the overcharge / fast charge performance of the battery cell 100, additives that improve the high-temperature performance of the battery cell 100, additives that improve the low-temperature performance of the battery cell 100, etc.

[0136] In some embodiments, the gel electrolyte comprises a polymer as a backbone network and can be used in conjunction with an ionic liquid-lithium salt.

[0137] In some embodiments, the solid electrolyte includes a polymer solid electrolyte, an inorganic solid electrolyte, and a composite solid electrolyte.

[0138] As an example, the polymers of polymeric solid electrolytes may include polyethers (polyoxyethylene), polysiloxanes, polycarbonates, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids, cellulose, etc.

[0139] As an example, inorganic solid electrolytes can be one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphorus sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0140] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0141] In some embodiments, the positive electrode, negative electrode, and separator are wound together.

[0142] The electrode assembly 20 has a wound structure. Exemplarily, the positive electrode, the separator, and the negative electrode are wound into a cylindrical wound structure.

[0143] In some embodiments, the positive electrode, the negative electrode, and the separator are stacked.

[0144] Referring to Figures 3 and 4, in some embodiments, the battery cell 100 includes a housing 10, an electrode assembly 20, an electrode terminal 30, a first insulating member 40, and a second insulating member 50. The housing 10 has a first sidewall 101 and a receiving cavity 102. The first sidewall 101 has a first through hole 1011 communicating with the receiving cavity 102. At least a portion of the electrode assembly 20 is disposed within the receiving cavity 102. The electrode terminal 30 is electrically connected to the electrode assembly 20 through the first through hole 1011. The first insulating member 40 is disposed between the electrode terminal 30 and the first sidewall 101 to insulatingly separate the electrode terminal 30 and the first sidewall 101. At least a portion of the first insulating member 40 is provided with a second insulating member 50 between it and the electrode terminal 30, and / or, at least a portion of the first insulating member 40 is provided with a second insulating member 50 between it and the first sidewall 101. The heat resistance of the second insulating member 50 is greater than that of the first insulating member 40.

[0145] The outer shell 10 may refer to a hollow component. The internal space of the outer shell 10 forms a receiving cavity. The outer shell 10 is formed by multiple side walls, one of which forms the first side wall 101.

[0146] As an example, the end cap 11 and the housing 12 together enclose a receiving cavity.

[0147] For example, the first sidewall 101 can be the end cap 11.

[0148] For example, the first sidewall 101 may also refer to the sidewall of the housing 12. For example, the first sidewall 101 may refer to the sidewall of the housing 12 adjacent to the end cap 11, or it may refer to the sidewall of the housing 12 opposite to the end cap 11.

[0149] Electrode terminal 30 can refer to a conductive component capable of electrically connecting electrode assembly 20 and external circuitry. Electrode terminal 30 is formed independently of housing 10 and assembled together during the production process of battery cell 100. Electrode terminal 30 is insulatedly disposed on end cap 11 or housing 12.

[0150] The number of electrode terminals 30 can be one or two.

[0151] As an example, there is one electrode terminal 30, and the two tabs of the electrode assembly 20 (i.e., the positive tab and the negative tab) are electrically connected to the electrode terminal 30 and the housing 10, respectively.

[0152] For example, electrode terminal 30 is provided on end cover 11, one tab of electrode assembly 20 is electrically connected to electrode terminal 30, and the other tab of electrode assembly 20 is electrically connected to the side wall of housing 12 opposite to end cover 11.

[0153] As an example, there are two electrode terminals 30. The two electrode terminals 30 can be located on the same side wall of the housing 10 or on different side walls of the housing 10.

[0154] For example: two electrode terminals 30 are spaced apart on the end cap 11.

[0155] The first through hole 1011 can refer to a through hole that penetrates the first sidewall 101, and the first through hole 1011 connects the outside of the outer shell 10 and the receiving cavity.

[0156] As an example, electrode terminal 30 can be directly electrically connected to the tab of electrode assembly 20 through the first through hole 1011. Alternatively, electrode terminal 30 can be directly soldered to the tab of electrode assembly 20.

[0157] As an example, electrode terminal 30 can also be electrically connected to the tab of electrode assembly 20 via a first conductive element 61 (e.g., adapter plate, current collector, etc.).

[0158] For example, the first conductive element 61 is located within the receiving cavity, a portion of the electrode terminal 30 is located within the first through hole 1011 and electrically connected to the first conductive element 61, and another portion of the electrode terminal 30 is located outside the housing 10 for electrical connection to an external circuit; alternatively, the entire electrode terminal 30 is located within the first through hole 1011; or alternatively, the entire electrode terminal 30 is located outside the housing 10. The electrode terminal 30 and the first conductive element 61 can be electrically connected by welding, riveting, or other methods.

[0159] As an example, the housing 10 can be directly electrically connected to the tabs of the electrode assembly 20. For example, the housing 10 is directly soldered to the tabs of the electrode assembly 20.

[0160] As an example, the housing 10 can also be electrically connected to the tabs of the electrode assembly 20 via a second conductive element 62 (e.g., an adapter plate, a current collector, etc.). For example, the housing 10 and the second conductive element 62 can be electrically connected by welding, riveting, or other methods.

[0161] The first insulating component 40 can refer to a component that can insulate and separate the first sidewall 101 and the electrode terminal 30. The first insulating component 40 can be partially located between the first sidewall 101 and the electrode terminal 30, or it can be completely located between the first sidewall 101 and the electrode terminal 30. The first insulating component 40 is made of insulating material, such as plastic.

[0162] As an example, the first insulating member 40 is disposed around the electrode terminal 30 and passes through the first through hole 1011 to insulate and separate the first sidewall 101 and the electrode terminal 30.

[0163] The second insulating component 50 can refer to a component made of insulating material, such as plastic or ceramic.

[0164] A second insulating member 50 is provided between at least a portion of the first insulating member 40 and the electrode terminal 30. For example, the second insulating member 50 may be located between the first insulating member 40 and the electrode terminal 30, and the first insulating member 40 may be located between the second insulating member 50 and the first sidewall 101. Alternatively, the second insulating member 50 may be embedded inside the first insulating member 40, with a portion of the first insulating member 40 located between the second insulating member 50 and the electrode terminal 30, and another portion of the second insulating member 50 located between the second insulating member 50 and the first sidewall 101.

[0165] A second insulating member 50 is provided between at least a portion of the first insulating member 40 and the first sidewall 101. For example, the second insulating member 50 may be located between the first insulating member 40 and the first sidewall 101, or the first insulating member 40 may be located between the second insulating member 50 and the electrode terminal 30. Alternatively, the second insulating member 50 may be embedded inside the first insulating member 40, with a portion of the first insulating member 40 located between the second insulating member 50 and the electrode terminal 30, and another portion of the second insulating member 50 located between the second insulating member 50 and the first sidewall 101.

[0166] The heat resistance of the first insulating component 40 is greater than that of the second insulating component 50. It is understood that when the first insulating component 40 softens or melts, the second insulating component 50 does not soften or melt, or the degree of softening or melting of the second insulating component 50 is lower than that of the first insulating component 40. In this case, the second insulating component 50 can maintain a stable structural shape, so that the second insulating component 50 can insulate and separate the first sidewall 101 and the electrode terminal 30.

[0167] By adopting the technical solution of this embodiment, the electrode assembly 20 is installed inside the housing 10. The housing 10 includes a first sidewall 101, and the first sidewall 101 is provided with a first through hole 1011. The electrode assembly 20 is electrically connected to the first through hole 1011. A first insulating member 40 is provided between the electrode terminal 30 and the first sidewall 101. At least a portion of the first insulating member 40 is provided between the electrode terminal 30 and / or at least a portion of the first insulating member 40 is provided between the first insulating member 40 and the first sidewall 101, so that the first insulating member 40 and the second insulating member 50 can insulate and separate the electrode terminal 30 and the first sidewall 101, so as to realize the stable input or output of electrical energy of the battery cell 100. Because the heat resistance of the second insulating member 50 is greater than that of the first insulating member 40, the second insulating member 50 can maintain a stable structural form in the event of overheating of the electrode terminal 30 or thermal runaway of the battery cell 100, or softening or melting of the first insulating member 40. The second insulating member 50 insulates and separates the first sidewall 101 and the electrode terminal 30, reducing the risk of short circuit between the first sidewall 101 and the electrode terminal 30, and improving the reliability of the battery cell 100. In addition, the first insulating member 40 and the second insulating member 50 are disposed between the first sidewall 101 and the electrode terminal 30, which can realize two layers of insulation between the electrode terminal 30 and the first sidewall 101, improving the insulation reliability between the electrode terminal 30 and the first sidewall 101, and improving the reliability of the battery cell 100.

[0168] In some embodiments, the first insulating member 40 and the second insulating member 50 are made of insulating materials. The heat resistance of the insulating materials can be characterized by their melting point. However, some insulating materials (e.g., thermosetting insulating materials) do not have a fixed melting point, and their heat resistance can be characterized by their thermogravimetric temperature.

[0169] Melting point can refer to the temperature at which a substance changes from a solid to a liquid state. This is a phase transition process, usually accompanied by a constant temperature and the absorption of latent heat.

[0170] As an example, the melting point of insulating materials can be found in textbooks and other publicly available books. The melting point of insulating components can also be measured using the methods described in GB / T 11026 Heat Resistance of Electrical Insulation Materials. The melting point of some insulating coatings can be measured using the methods described in GB / T 42259 Test Method for Thermal Barrier Coatings of Metals and Other Inorganic Coatings. Of course, it can also be measured using the methods described in GB / T 19466 Differential Scanning Calorimetry (DSC).

[0171] Thermogravimetric temperature (TGT) is the temperature at which a material begins to lose mass during heating. In this embodiment, TGT can refer to the temperature at which the material's mass loss is 5%, i.e., the temperature at which the material's mass decreases by 5% relative to its initial mass during thermogravimetric analysis. The TGT can be measured using the method described in GB / T 27761-2011, "Test Method for Weight Loss and Residual Amount of Thermogravimetric Analyzer".

[0172] In some embodiments, the melting point of the second insulating member 50 is greater than the melting point of the first insulating member 40.

[0173] By adopting the technical solution of this embodiment, when the temperature at the electrode terminal 30 exceeds the melting point of the first insulating member 40, the first insulating member 40 softens or melts, but does not reach the melting point of the second insulating member 50. The second insulating member 50 has a stable structural form, thereby stably insulating and separating the electrode terminal 30 and the first sidewall 101, reducing the short circuit risk of the battery cell 100, and improving the reliability of the battery cell 100.

[0174] In some embodiments, the thermal weight loss temperature of the second insulating member 50 is greater than that of the first insulating member 40.

[0175] By adopting the technical solution of this embodiment, when the temperature at the electrode terminal 30 exceeds the thermal weight loss temperature of the first insulating member 40, the first insulating member 40 softens or melts, but does not reach the thermal weight loss temperature of the second insulating member 50. The second insulating member 50 has a stable structural form, thereby stably insulating and separating the electrode terminal 30 and the first sidewall 101, reducing the short circuit risk of the battery cell 100 and improving the reliability of the battery cell 100.

[0176] In some embodiments, the melting point or thermal weight loss temperature of the second insulating element 50 is greater than or equal to 300°C.

[0177] It is understood that the melting point of the second insulating element 50 is greater than or equal to 300°C, or the thermal weight loss temperature of the second insulating element 50 is greater than or equal to 300°C.

[0178] For example, the melting point of the second insulating element 50 may be 300°C, 350°C, 400°C, 500°C, 600°C, 700°C, 800°C, 900°C, 100°C, etc.

[0179] For example, the thermal decomposition temperature of the second insulating element 50 may be 300℃, 350℃, 400℃, 500℃, 600℃, 700℃, 800℃, 900℃, 100℃, etc.

[0180] In some battery cells 100, the first insulating component 40 softens or melts at temperatures of 100°C or 200°C, while the melting point or thermal weight loss temperature of the second insulating component 50 is greater than or equal to 300°C. This ensures that the second insulating component 50 has a stable structural form when the first insulating component 40 is softened or melted, thereby insulating and separating the first sidewall 101 and the electrode terminal 30.

[0181] In some embodiments, the melting point or thermal weight loss temperature of the second insulating element 50 is greater than or equal to 500°C.

[0182] By adopting the technical solution of this embodiment, when the first insulating member 40 is in a softened or molten state, the second insulating member 50 has a more stable structural form, thereby more stably insulating and separating the first sidewall 101 and the electrode terminal 30.

[0183] In some embodiments, the melting point or thermal weight loss temperature of the second insulating element 50 is greater than or equal to 700°C.

[0184] In some battery cells 100, the electrode terminals 30 are made of aluminum, and the melting point of aluminum is less than 700°C. The melting point or thermal weight loss temperature of the second insulating component 50 is greater than that of the electrode terminals 30. Even if the electrode terminals 30 melts, the second insulating component 50 still has good structural stability, thereby separating the electrode terminals 30 from the first sidewall 101, which helps to improve the reliability of the battery cells 100.

[0185] In some embodiments, the resistivity of the second insulating member 50 is greater than or equal to 1*10⁻⁶. 12 Ω·cm.

[0186] Resistivity is a physical quantity that describes the degree to which a material impedes the flow of electric current. It is a scalar quantity used to measure the ability of a material to impede the flow of electric current per unit length and unit cross-sectional area. Resistivity can be measured using the methods described in GB / T 10581-2006.

[0187] The resistivity of the second insulating component 50 can be 1*10. 12 Ω·cm, 5*10 12 Ω·cm, 1*10 13 Ω·cm, 5*10 13 Ω·cm, 1*10 14 Ω·cm, etc.

[0188] By adopting the technical solution of this embodiment, the second insulating member 50 has good insulation performance. When the first insulating member 40 softens or melts, the second insulating member 50 can stably insulate and separate the first sidewall 101 and the electrode terminal 30, reducing the risk of short circuit in the battery cell 100 and improving the reliability of the battery cell 100.

[0189] In some embodiments, the first sidewall 101 includes a first surface 1012, the outer surface of the electrode terminal 30 includes a second surface 301, the first surface 1012 and the second surface 301 are disposed opposite to each other, and the first insulating member 40 and the second insulating member 50 are located between the first surface 1012 and the second surface 301.

[0190] The electrode terminal 30 is mounted on the first sidewall 101. The surfaces of the first sidewall 101 and the electrode terminal 30 that are opposite to each other are divided into a first surface 1012 and a second surface 301. The first surface 1012 is located on the first sidewall 101, and the second surface 301 is located on the electrode terminal 30.

[0191] As an example, the electrode terminal 30 is inserted into the first through hole 1011. The electrode terminal 30 has a columnar structure, and its outer peripheral wall is the second surface 301. The inner wall of the first through hole 1011 is the first surface 1012. A groove is formed on the outer peripheral surface of the electrode terminal 30. The portion of the first sidewall 101 near the first through hole 1011 is engaged in the groove. The groove wall is the second surface 301. The two surfaces of the first sidewall 101 that are opposite to each other along the axial direction of the first through hole 1011 and the hole wall of the first through hole 1011 together form the first surface 1012. The axial direction of the first through hole 1011 can refer to the axial direction of the electrode assembly 20 or the height direction of the battery cell 100, specifically referring to the Z direction in Figures 1-4.

[0192] As an example, the electrode terminal 30 is located on the outside of the housing 10, the surface of the electrode terminal 30 facing the first sidewall 101 is the second surface 301, and the surface of the first sidewall 101 facing the electrode terminal 30 is the first surface 1012.

[0193] The first insulating member 40 may be partially located between the first surface 1012 and the second surface 301, or the entire first insulating member 40 may be located between the first surface 1012 and the second surface 301, thereby insulatingly separating the electrode terminal 30 and the first sidewall 101 from each other, thus insulating the electrode terminal 30 and the first sidewall 101.

[0194] The second insulating member 50 may be partially located between the first surface 1012 and the second surface 301, or the entire second insulating member 50 may be located between the first surface 1012 and the second surface 301, thereby insulatingly separating the opposing surfaces of the electrode terminal 30 and the first sidewall 101, thus insulating the electrode terminal 30 and the first sidewall 101.

[0195] By adopting the technical solution of this embodiment, when the first insulating member 40 softens and melts, the second insulating member 50 can insulate and separate the first sidewall 101 and the first surface 1012 and the second surface 301 of the electrode terminal 30 that are opposite to each other, thereby achieving insulation between the electrode terminal 30 and the first sidewall 101.

[0196] In some embodiments, a second insulating member 50 is provided between the first insulating member 40 and the first sidewall 101, and the second insulating member 50 covers at least a portion of the first surface 1012.

[0197] The second insulating member 50 may cover a portion of the first surface 1012. For example, the first insulating member 40 covers a portion of the surface of the first sidewall 101 near the first through hole 1011. The second insulating member 50 may also cover the entire first surface 1012.

[0198] For example, the second insulating element 50 may refer to an insulating coating covering the first surface 1012, or it may refer to an insulating component covering the first surface 1012. The insulating component may or may not be connected to the first surface 1012.

[0199] By adopting the technical solution of this embodiment, the second insulating member 50 covers the first surface 1012 of the housing 12. When the first insulating member 40 softens or melts, the second insulating member 50 can insulate and separate the first surface 1012 of the electrode terminal 30 and the second surface 301 of the first sidewall 101, so that the electrode terminal 30 and the first sidewall 101 are insulated.

[0200] In some embodiments, the second insulating member 50 includes a first insulator portion 51, and the first surface 1012 includes a plurality of first covering surfaces 10121, at least a portion of at least one first covering surface 10121 covering the first insulator portion 51.

[0201] The first surface 1012 may be composed of multiple first covering surfaces 10121. The first covering surface 10121 may be a plane, a curved surface, or other shapes.

[0202] The second insulating member 50 includes one or more first insulator portions 51. When the number of first insulator portions 51 is one, the first insulator portion 51 covers a first covering surface 10121, thereby insulatingly separating the electrode terminal 30 from the first sidewall 101.

[0203] As an example, among the plurality of first covering surfaces 10121, one of the first covering surfaces 10121 covers a first insulator portion 51 to insulatingly separate the first sidewall 101 and the electrode terminal 30. The first insulator portion 51 may cover a portion of the first covering surface 10121 or cover the entire first covering surface 10121.

[0204] As an example, in a plurality of first covering surfaces 10121, the plurality of first covering surfaces 10121 cover a first insulator portion 51 to insulatingly separate the first sidewall 101 and the electrode terminal 30.

[0205] By adopting the technical solution of this embodiment, when the first insulating member 40 softens and melts, the first insulator portion 51 covers the first covering surface 10121. The first insulator portion 51 is located between the electrode terminal 30 and the first sidewall 101, and can insulate and separate the first sidewall 101 and the electrode terminal 30.

[0206] In some embodiments, the thickness of the first insulator portion 51 is T1, wherein 5μm≤T1≤100μm.

[0207] The thickness T1 of the first insulator portion 51 can refer to the dimension of the first insulator portion 51 along the direction perpendicular to the corresponding first covering surface 10121; the thickness T1 of the first insulator portion 51 covering different first covering surfaces 10121 can be the same or different.

[0208] As an example, the thickness T1 of the first insulator portion 51 can be 5μm, 100μm, or any number between 5μm and 100μm. For example, the thickness T1 of the first insulator portion 51 can be, but is not limited to, 5μm, 8μm, 10μm, 12μm, 20μm, 25μm, 30μm, 40μm, 60μm, 70μm, or 100μm.

[0209] The design with a T1 ≥ 5 μm ensures that the first insulator portion 51 can insulatingly separate the first sidewall 101 and the electrode terminal 30 when the first insulating component 40 softens and melts. Furthermore, the design with a T1 ≤ 100 μm reduces the space occupied by the first insulator portion 51, minimizing material waste and reducing the manufacturing difficulty of the first insulator portion. Therefore, it effectively balances the insulation between the electrode terminal 30 and the first sidewall 101 with the structural compactness of the battery cell 100.

[0210] In some embodiments, 10μm≤T1≤30μm can better balance the insulation of the electrode terminal 30 and the first sidewall 101 with the structural compactness of the battery cell 100.

[0211] In some embodiments, a plurality of first covering surfaces 10121 include a first surface 10122, a second surface 10123, and a third surface 10124. The first surface 10122 is disposed away from the electrode assembly 20, the third surface 10124 is disposed towards the electrode assembly 20, and the second surface 10123 is connected between the first surface 10122 and the second surface 10123. The second surface 10123 surrounds and forms a first through hole 1011. At least one of at least a portion of the first surface 10122, at least a portion of the second surface 10123, and at least a portion of the third surface 10124 is covered with a first insulator portion 51.

[0212] As an example, the first sidewall 101 has a plate-like structure, and there are three first covering surfaces 10121, namely the first surface 10122, the second surface 10123, and the third surface 10124. The hole wall surface of the first through hole 1011 is the second surface 10123. Along the axial direction of the first through hole 1011, the two oppositely distributed surfaces of the first sidewall 101 are the first surface 10122 and the third surface 10124. The first surface 10122 is set away from the electrode assembly 20, that is, the outer surface of the first sidewall 101, and the third surface 10124 is designed to face the electrode assembly 20, that is, the inner surface of the first sidewall 101.

[0213] As an example, the number of first coverage surfaces 10121 is greater than three, where the three first coverage surfaces 10121 are first surface 10122, second surface 10123 and third surface 10124 respectively.

[0214] As an example, at least a portion of the first surface 10122 is covered by the first insulator portion 51, a part of the first surface 10122 is covered by the first insulator portion 51, and the entire first surface 10122 is covered by the first insulator portion 51.

[0215] As an example, at least a portion of the second surface 10123 is covered by the first insulator portion 51, a part of the second surface 10123 is covered by the first insulator portion 51, and the entire second surface 10123 is covered by the first insulator portion 51.

[0216] As an example, at least a portion of the third surface 10124 is covered by the first insulator portion 51, a part of the third surface 10124 is covered by the first insulator portion 51, and the entire third surface 10124 is covered by the first insulator portion 51.

[0217] As an example, any two of the first surface 10122, the second surface 10123, and the third surface 10124 are covered with the first insulator portion 51, or the first surface 10122, the second surface 10123, and the third surface 10124 are all covered with the first insulator portion 51.

[0218] By adopting the technical solution of this embodiment, when the first insulating member 40 softens and melts, the first insulator portion 51 is located between the electrode terminal 30 and the first sidewall 101, which can insulate and separate the first sidewall 101 and the electrode terminal 30.

[0219] In some embodiments, the outer surface of the electrode terminal 30 is covered with a second insulating member 50, the second insulating member 50 including a first insulating portion 52, the first insulating portion 52 covering at least a portion of the second surface 301.

[0220] The first insulating portion 52 may refer to the portion of the second insulating member 50 covering the second surface 301, the first insulating portion 52 covering a portion of the second surface 301, or the entire second surface 301 being covered by the first insulating portion 52.

[0221] As an example, the outer surface of the electrode terminal 30 is coated with an insulating coating, that is, the second insulating member 50 is an insulating coating, or the electrode terminal 30 is fitted with an insulating member, which is the second insulating member 50.

[0222] By adopting the technical solution of this embodiment, when the first insulating member 40 softens and melts, the first insulating part 52 is located between the second surface 301 and the first sidewall 101, which can insulate and separate the first sidewall 101 and the electrode terminal 30; in addition, the structure of the electrode terminal 30 is simple, and the process of setting the second insulating member 50 on its outer surface is simple and convenient to process and manufacture.

[0223] In some embodiments, the area of ​​the outer surface of the electrode terminal 30 is S1, and the coverage area of ​​the electrode terminal 30 covered by the second insulating member 50 is S2, wherein 0.35≤S2 / S1≤0.85.

[0224] As an example, S2 / S1 can be 0.35, 0.85, or any number between 0.35 and 0.85. For example, S2 / S1 can be, but is not limited to, 0.35, 0.37, 0.4, 0.45, 0.5, 0.55, 0.6, 0.7, 0.75, 0.8, or 0.85.

[0225] The design with S2 / S1≥0.3 allows the electrode terminal 30 to be covered by the second insulating member 50, thereby insulating and separating the electrode terminal 30 from the first sidewall 101 when the first insulating member 40 softens or melts. The design with S2 / S1≤0.85 allows a portion of the electrode terminal 30 to flow out for electrical connection with the busbar and electrode assembly 20, improving the connection reliability between the electrode terminal 30, the busbar and the electrode assembly 20, and improving the performance of the battery cell 100. Therefore, it can simultaneously ensure the insulation between the electrode terminal 30 and the first sidewall 101 and the connection reliability between the electrode terminal 30, the busbar and the electrode assembly 20.

[0226] In some embodiments, 0.45≤S2 / S1≤0.75 can better balance the insulation between the electrode terminal 30 and the first sidewall 101, as well as the connection reliability between the electrode terminal 30, the busbar and the electrode assembly 20.

[0227] In some embodiments, the second insulating member 50 includes a second insulating portion 53, and the outer surface of the electrode terminal 30 includes a first end face 302, which is disposed away from the electrode assembly 20, and at least a portion of the first end face 302 is covered by the second insulating portion 53.

[0228] Along the axial direction of the first through hole 1011, the surface of the electrode terminal 30 facing away from the electrode assembly 20 is a first end face 302. A portion of the first end face 302 is covered by the second insulating portion 53, or the entire first end face 302 is covered by the second insulating portion 53. The shape of the first end face 302 can be various, such as: a plane, a stepped surface, etc.

[0229] For example, when the first end face 302 is fully covered by the second insulating portion 53, during the welding process between the busbar and the first end face 302, a portion of the second insulating portion 53 can be destroyed, thereby enabling the busbar and the first end face 302 to be stably welded together.

[0230] By adopting the technical solution of this embodiment, the first end face 302 of the electrode terminal 30 is covered with the second insulating portion 53, which can increase the insulating area of ​​the electrode terminal 30, which is beneficial to improving the insulation effect of the electrode terminal 30 and improving the reliability of the battery cell 100.

[0231] In some embodiments, the first end face 302 includes a first portion 3021 and a second portion 3022. The first portion 3021 is used for electrical connection with a busbar component, and the second portion 3022 is not used for electrical connection with a busbar component. The first portion 3021 is not covered by the second insulating portion 53, and at least a portion of the second portion 3022 is covered by the second insulating portion 53.

[0232] The first end face 302 is electrically connected to the busbar component to input and output electrical energy from the battery cells 100. The busbar component can connect multiple battery cells 100 in parallel, series, or mixed connections. The busbar component is made of conductive metal components, such as copper or aluminum. The first end face 302 is divided into two parts: one part is connected to the busbar component, namely the first part 3021, and the other part is not connected to the busbar component, namely the second part 3022.

[0233] As an example, the first part 3021 can be directly connected to the bus component to achieve an electrical connection. For example, the bus component can be directly soldered to the first part 3021. Of course, in other examples, there may be other electrical connection methods.

[0234] The first part 3021 is not covered by the second insulating part 53, a part of the second part 3022 is covered by the second insulating part 53, or the entire second part 3022 is covered by the second insulating part 53.

[0235] By adopting the technical solution of this embodiment, the first part 3021 is not covered by the second insulating part 53, which can reduce the impact of the second insulating part 53 on the electrical connection between the busbar and the first part 3021, and is beneficial to the connection reliability of the battery cell 100; the second part 3022 is at least partially covered by the second insulating part 53, which can increase the insulation area of ​​the electrode terminal 30, increase the insulation performance of the electrode terminal 30, reduce the short circuit risk of the battery cell 100, and is beneficial to improving the reliability of the battery cell 100.

[0236] In some embodiments, the electrode terminal 30 further includes an end body 31 and a cap 32. The end body 31 is electrically connected to the electrode assembly 20 and passes through the first through hole 1011. The end face of the end body 31 facing away from the electrode assembly 20 includes a recessed portion 3101 and a planar portion 3102. The recessed portion 3101 is recessed relative to the planar portion 3102 toward the electrode assembly 20 to form a recessed space 3103. At least a portion of the cap 32 is installed in the recessed space 3103. The side of the cap 32 facing away from the electrode assembly 20 and the planar portion 3102 together form a first end face 302.

[0237] The end body 31 can refer to the main body of the electrode terminal 30. For example, the end body 31 is composed of the connecting part 313, the first limiting part 311, and the second limiting part 312.

[0238] As an example, along the axial direction of the first through hole 1011, the middle of the end face of the end body 31 facing away from the electrode assembly 20 is recessed towards the electrode assembly 20 to form a recessed space 3103. The cavity wall of the recessed space 3103 forms a recessed portion 3101. The end face of the end body 31 surrounding the opening of the recessed space 3103 is a flat portion 3102. The flat portion 3102 surrounds the recessed portion 3101. The design of the recessed space 3103 can reduce the thickness of the electrode terminal 30 at this location, making it convenient to set the liquid injection hole 3104 here. The cap 32 is installed in the recessed space 3103 to close the opening of the recessed space 3103, thereby sealing the liquid injection hole 3104. The liquid injection hole 3104 is integrated into the electrode terminal 30, eliminating the need to set the liquid injection hole 3104 on the outer casing 10, which helps to simplify the structure of the battery cell 100 and improve the mechanical strength of the battery cell 100.

[0239] As an example, the cap body 32 can be sealed and installed in the recessed space 3103 by means of welding, sealing rings, interference fit, etc.

[0240] By adopting the technical solution of this embodiment, the electrode terminal 30 adopts the structure of end body 31 and cap body 32, which makes it convenient to set the liquid injection hole 3104 on the electrode terminal 30, which helps to simplify the structure of the battery cell 100 and improve the reliability of the battery cell 100.

[0241] In some embodiments, the cap 32 forms a first portion 3021 on the side facing away from the electrode assembly 20, and the planar portion 3102 forms a second portion 3022; or, the planar portion 3102 forms the first portion 3021, and the cap 32 forms the second portion 3022 on the side facing away from the electrode assembly 20.

[0242] It is understood that the busbar is electrically connected to the side of the cap 32 facing away from the electrode assembly 20, and the end face of the end body 31 facing away from the electrode terminal 30 is covered with the second insulating portion 53; or, the busbar is electrically connected to the end face of the end body 31 facing away from the electrode terminal 30, and the side of the cap 32 facing away from the electrode assembly 20 is covered with the second insulating portion 53.

[0243] By adopting the technical solution of this embodiment, the busbar component can be electrically connected to the cap 32 or the end body 31, and the connection between the busbar component and the electrode terminal 30 can be flexibly configured to meet different usage requirements. In addition, since no second insulating part 53 is provided between the busbar component and the electrode terminal 30, the influence of the second insulating part 53 on the electrical connection between the busbar component and the electrode terminal 30 can be reduced, which is beneficial to improving the power input or output performance of the battery cell 100.

[0244] In some embodiments, the thickness of the second insulating portion 53 is T2, wherein 0 < T2 ≤ 100 μm, and optionally, 0 < T2 ≤ 30 μm.

[0245] As an example, the thickness T2 of the second insulating portion 53 can be 100 μm or any number between 0 μm and 100 μm. For example, the thickness T2 of the second insulating portion 53 can be, but is not limited to, 1 μm, 5 μm, 8 μm, 10 μm, 12 μm, 20 μm, 25 μm, 30 μm, 40 μm, 60 μm, 70 μm, or 100 μm.

[0246] The design with T2 > 0 μm allows the first end face 302 to cover the second insulating portion 53, increasing the insulation area of ​​the electrode terminal 30 and improving its insulation performance, which is beneficial to improving the reliability of the battery cell 100. Furthermore, the design with T2 ≤ 100 μm reduces the space occupied by the second insulating portion 53, reducing material waste and the manufacturing difficulty of the second insulating portion 53. Therefore, it is possible to better balance the insulation performance of the electrode terminal 30 and the structural compactness of the battery cell 100.

[0247] In some embodiments, 0 < T2 ≤ 30 μm can better balance the insulation performance of the electrode terminal 30 and the structural compactness of the battery cell 100.

[0248] In some embodiments, the first insulating portion 52 includes a second insulator portion 521, and the second surface 301 includes a plurality of second covering surfaces 3011, at least a portion of which covers the second insulator portion 521.

[0249] The second surface 301 is composed of multiple second covering surfaces 3011, which can be flat, curved, or of other shapes.

[0250] The first insulating portion 52 includes one or more second insulator portions 521. When the number of second insulator portions 521 is one, the second insulator portion 521 covers a second covering surface 3011, thereby insulatingly separating the electrode terminal 30 from the first sidewall 101.

[0251] As an example, among a plurality of second cover surfaces 3011, one of the second cover surfaces 3011 covers a second insulator portion 521 to insulatingly separate the first sidewall 101 and the electrode terminal 30. The second insulator portion 521 may cover a portion of the second cover surface 3011 or cover the entire second cover surface 3011.

[0252] As an example, in a plurality of second covers 3011, the plurality of second covers 3011 cover a second insulator portion 521 to insulatingly separate the first sidewall 101 and the electrode terminal 30.

[0253] By adopting the technical solution of this embodiment, when the first insulating member 40 softens and melts, the second insulator portion 521 covers the second covering surface 3011. The second insulator portion 521 is located between the electrode terminal 30 and the first sidewall 101, and can insulate and separate the first sidewall 101 and the electrode terminal 30.

[0254] In some embodiments, the thickness of the second insulator portion 521 is T3, wherein 5μm≤T3≤100μm, and optionally, 10μm≤T3≤30μm.

[0255] The thickness T3 of the second insulator portion 521 can refer to the dimension of the second insulator portion 521 along the direction perpendicular to the corresponding second covering surface 3011; the thickness T3 of the second insulator portion 521 covering different second covering surfaces 3011 can be the same or different.

[0256] As an example, the thickness T3 of the second insulator portion 521 can be 5μm, 100μm, or any number between 5μm and 100μm. For example, the thickness T3 of the second insulator portion 521 can be, but is not limited to, 5μm, 8μm, 10μm, 12μm, 20μm, 25μm, 30μm, 40μm, 60μm, 70μm, or 100μm.

[0257] The design with a T3 ≥ 5 μm ensures that the second insulator portion 521 can insulatingly separate the first sidewall 101 and the electrode terminal 30 when the first insulating component 40 softens and melts. Furthermore, the design with a T3 ≤ 100 μm reduces the space occupied by the second insulator portion 521, minimizing material waste and reducing the manufacturing difficulty of the second insulator portion 521. Therefore, it effectively balances the insulation between the electrode terminal 30 and the first sidewall 101 with the structural compactness of the battery cell 100.

[0258] In some embodiments, 10μm≤T3≤30μm can better balance the insulation of the electrode terminal 30 and the first sidewall 101 with the structural compactness of the battery cell 100.

[0259] In some embodiments, the plurality of second covering surfaces 3011 include a fourth surface 3012, a fifth surface 3013, and a sixth surface 3014; the electrode terminal 30 includes a first limiting portion 311, a second limiting portion 312, and a connecting portion 313 connecting the first limiting portion 311 and the second limiting portion 312; the connecting portion 313 passes through the first through hole 1011, the first limiting portion 311 is located on the side of the first sidewall 101 facing away from the electrode assembly 20, and the second limiting portion 312 is located within the receiving cavity 102; the first limiting portion 311... A first limiting protrusion 3111 protrudes from the outer peripheral surface of the connecting portion 313, and a second limiting portion 312 protrudes from the outer peripheral surface of the connecting portion 313 to form a second limiting protrusion 3121. A portion of the first sidewall 101 is located between the first limiting portion 311 and the second limiting portion 312. A fifth surface 3013 is formed on the outer peripheral surface of the connecting portion 313. A fourth surface 3012 is formed on the side of the first limiting protrusion 3111 facing the electrode assembly 20. A sixth surface 3014 is formed on the side of the second limiting protrusion 3121 facing away from the electrode assembly 20.

[0260] Along the axial direction of the first through hole 1011, the radial dimensions of the two ends of the electrode terminal 30 are large, and the radial dimension in the middle is small. The part with the small radial dimension in the middle forms the connecting part 313. The two ends of the electrode terminal 30 respectively form a first limiting part 311 and a second limiting part 312. The first limiting part 311 is located on the outside of the battery cell 100, and the second limiting part 312 is located on the inside of the battery cell 100. The part of the first limiting part 311 that protrudes from the outer peripheral surface of the connecting part 313 forms a first limiting protrusion 3111, and the part of the second limiting part 312 that protrudes from the outer peripheral surface of the connecting part 313 forms a second limiting protrusion 3121. The first limiting protrusion 3111 and the second limiting protrusion 3121 are used to clamp the first sidewall 101, thereby fixing the electrode terminal 30.

[0261] As an example, the radial dimension of the connecting portion 313 is smaller than the diameter of the first through hole 1011, allowing the electrode terminal 30 to pass through the first through hole 1011. The radial dimension of the first limiting portion 311 is larger than the diameter of the first through hole 1011, and the radial dimension of the second limiting portion 312 is larger than the diameter of the first through hole 1011. That is, the first limiting protrusion 3111 and the second limiting protrusion 3121 block the first sidewall 101, making it difficult for the electrode terminal 30 to come out of the first through hole 1011, thus fixing the electrode terminal 30 on the first sidewall 101. The first limiting portion 311 and the second limiting portion 312 can be manufactured by a flanging process or by machining.

[0262] The first limiting protrusion 3111 and the second limiting protrusion 3121 are opposite to each other. Their two surfaces are divided into a fourth surface 3012 and a sixth part. The fourth surface 3012 is located on the first limiting protrusion 3111, and the sixth surface 3014 is located on the second limiting protrusion 3121. The outer peripheral surface of the connecting part 313 is the fifth surface 3013. The fifth surface 3013 is opposite to the hole wall surface of the first through hole 1011 (i.e., the second surface 10123). The fifth surface 3013 is opposite to the surface of the first side wall 101 facing away from the electrode assembly 20 (i.e., the first surface 10122). The sixth surface 3014 is opposite to the surface of the first side wall 101 facing the electrode assembly 20 (i.e., the third surface 10124).

[0263] As an example, the number of second coverage surfaces 3011 is three, namely the fourth surface 3012, the fifth surface 3013 and the sixth surface 3014; or, the number of second coverage surfaces 3011 is greater than three, wherein the three second coverage surfaces 3011 are the fourth surface 3012, the fifth surface 3013 and the sixth surface 3014.

[0264] By adopting the technical solution of this embodiment, the electrode terminal 30 can be fixed by using the first limiting protrusion 3111 and the second limiting protrusion 3121 of the electrode terminal 30. Its structure is simple and convenient for the assembly of the battery cell 100.

[0265] In some embodiments, at least a portion of the fourth surface 3012 is covered by the second insulator portion 521.

[0266] It is understandable that a portion of the fourth surface 3012 is covered by the second insulator portion 521, or that the entire fourth surface 3012 is covered by the second insulator portion 521.

[0267] As an example, when the first insulating member 40 softens or melts, the fourth surface 3012 may come into contact with the first surface 10122. The fourth surface 3012 is covered with a second insulator portion 521, which may be located between the fourth surface 3012 and the first surface 10122, thereby insulatingly separating the first sidewall 101 and the electrode terminal 30.

[0268] As an example, along the axial direction of the first through hole 1011, the projection of the fourth surface 3012 coincides with the projection of the first surface 10122 to form an overlapping area. The projection of the second insulator portion 521 covering the fourth surface 3012 at least partially coincides with this overlapping area, thereby better insulating and separating the electrode terminal 30 and the first sidewall 101.

[0269] By adopting the technical solution of this embodiment, when the first insulating member 40 softens or melts, the second insulator portion 521 covering the fourth surface 3012 can be located between the fourth surface 3012 and the first sidewall 101, thereby insulating and separating the first sidewall 101 and the electrode terminal 30.

[0270] In some embodiments, the thickness of the second insulator portion 521 covering the fourth surface 3012 is T4, and the size of the first limiting protrusion 3111 along the axial direction of the first through hole 1011 is T5, wherein 0.005≤T4 / T5≤0.2.

[0271] As an example, the value of T4 / T5 can be 0.005, 0.2, or any number between 0.005 and 0.2. For example, the value of T4 / T5 can be, but is not limited to, 0.005, 0.01, 0.05, 0.1, 0.15, or 0.2.

[0272] With a fixed T5, a design where T4 / T5 ≥ 0.005 ensures that when the first insulating component 40 softens and melts, the second insulator portion 521 can insulatingly separate the fourth surface 3012 from the first sidewall 101, achieving insulation between the electrode terminal 30 and the first sidewall 101. Furthermore, a design where T4 / T5 ≤ 0.2 reduces the space occupied by the second insulator portion 521, minimizing material waste. Therefore, a good balance can be struck between the insulation of the electrode terminal 30 and the first sidewall 101 and the structural compactness of the battery cell 100.

[0273] In some embodiments, at least a portion of the fifth surface 3013 is covered by the second insulator portion 521.

[0274] It is understandable that a portion of the fifth surface 3013 is covered by the second insulator portion 521, or that the entire fifth surface 3013 is covered by the second insulator portion 521.

[0275] As an example, when the first insulating member 40 softens or melts, the fifth surface 3013 may come into contact with the second surface 10123. The fifth surface 3013 is covered by the second insulator portion 521, which may be located between the fifth surface 3013 and the second surface 10123, thereby insulatingly separating the first sidewall 101 and the electrode terminal 30.

[0276] As an example, the fifth surface 3013 is located within the second surface 10123, and at least the area of ​​the fifth surface 3013 directly opposite the second surface 10123 is covered by the second insulator portion 521 to better insulate and separate the electrode terminal 30 and the first sidewall 101.

[0277] By adopting the technical solution of this embodiment, when the first insulating member 40 softens or melts, the second insulator portion 521 covering the fifth surface 3013 can be located between the fifth surface 3013 and the first sidewall 101, thereby insulating and separating the first sidewall 101 and the electrode terminal 30.

[0278] In some embodiments, the thickness of the second insulator portion 521 covering the fifth surface 3013 is T6, and the radial dimension of the connecting portion 313 is D1, wherein 0.0003≤T6 / (D1+2T6)≤0.05.

[0279] The radial dimension D1 of the connecting part 313 can refer to the dimension perpendicular to the axial direction of the first through hole 1011. For example, the radial dimension of the connecting part 313 can refer to the diameter of the connecting part 313.

[0280] As an example, T6 / (D1+2T6) is 0.0003, 0.05, or any number between 0.0003 and 0.05. For example, the value of T6 / (D1+2T6) can be, but is not limited to, 0.0003, 0.0005, 0.001, 0.005, 0.01, 0.02, 0.03, 0.04, and 0.05.

[0281] With a fixed (D1+2T6) value, a design where T6 / (D1+2T6)≥0.0003 ensures that when the first insulating member 40 softens and melts, the second insulator portion 521 can insulate the fifth surface 3013 and the first sidewall 101, achieving insulation between the electrode terminal 30 and the first sidewall 101. Furthermore, a design where T6 / (D1+2T6)≤0.05 reduces the space occupied by the second insulator portion 521, increases the radial dimension of the connection portion 313, improves the current-carrying capacity of the connection portion 313, and enhances the fast-charging performance of the battery cell 100. Therefore, a good balance can be struck between the insulation of the electrode terminal 30 and the first sidewall 101 and the fast-charging performance of the battery cell 100.

[0282] In some embodiments, at least a portion of the sixth surface 3014 is covered by the second insulator portion 521.

[0283] It is understandable that a portion of the sixth surface 3014 is covered by the second insulator portion 521, or that the entire sixth surface 3014 is covered by the second insulator portion 521.

[0284] As an example, when the first insulating member 40 softens or melts, the sixth surface 3014 may come into contact with the third surface 10124. The sixth surface 3014 is covered with the second insulator portion 521, which may be located between the sixth surface 3014 and the third surface 10124, thereby insulatingly separating the first sidewall 101 and the electrode terminal 30.

[0285] As an example, along the axial direction of the first through hole 1011, the projection of the sixth surface 3014 coincides with the projection of the third surface 10124 to form an overlapping area. The projection of the second insulator portion 521 covering the sixth surface 3014 at least partially coincides with this overlapping area, thereby better insulating and separating the electrode terminal 30 and the first sidewall 101.

[0286] By adopting the technical solution of this embodiment, when the first insulating member 40 softens or melts, the second insulator portion 521 covering the sixth surface 3014 can be located between the sixth surface 3014 and the first sidewall 101, thereby insulating and separating the first sidewall 101 and the electrode terminal 30.

[0287] In some embodiments, the thickness of the second insulator portion 521 covering the sixth surface 3014 is T7, and the size of the second limiting protrusion 3121 along the axial direction of the first through hole 1011 is T8, wherein 0.005≤T7 / T8≤0.2.

[0288] As an example, the value of T7 / T8 can be 0.005, 0.2, or any number between 0.005 and 0.2. For example, the value of T7 / T8 can be, but is not limited to, 0.005, 0.01, 0.05, 0.1, 0.15, or 0.2.

[0289] With a fixed T8, a design where T7 / T8 ≥ 0.005 ensures that when the first insulating component 40 softens and melts, the second insulator portion 521 can insulatingly separate the sixth surface 3014 from the first sidewall 101, achieving insulation between the electrode terminal 30 and the first sidewall 101. Furthermore, a design where T7 / T8 ≤ 0.2 reduces the space occupied by the second insulator portion 521, minimizing material waste. Therefore, a good balance can be struck between the insulation of the electrode terminal 30 and the first sidewall 101 and the structural compactness of the battery cell 100.

[0290] In some embodiments, the second insulating member 50 includes a first insulator portion 51, and the first surface 1012 includes a plurality of first covering surfaces 10121. The plurality of first covering surfaces 10121 includes a first surface 10122, a second surface 10123, and a third surface 10124. The first surface 10122 is disposed away from the electrode assembly 20, the third surface 10124 is disposed towards the electrode assembly 20, and the second surface 10123 is connected between the first surface 10122 and the second surface 10123. The second surface 10123 surrounds and forms a first through hole 1011. At least a portion of 122 is covered by a first insulator portion 51, which protrudes from the first limiting protrusion 3111 away from the side of the fifth surface 3013 in the direction from the fifth surface 3013 to the second surface 10123; and / or, at least a portion of the third surface 10124 is covered by a first insulator portion 51, which protrudes from the second limiting protrusion 3121 away from the side of the fifth surface 3013 in the direction from the fifth surface 3013 to the second surface 10123 in the direction from the fifth surface 3013 to the second surface 10123.

[0291] The direction from the fifth face 3013 to the second face 10123 can be referenced to the radial direction of the first through hole 1011, specifically the direction indicated by arrow X in Figure 2-4.

[0292] In some examples, the second insulator 50 includes a first insulator portion 51, and the first surface 1012 includes a plurality of first covering surfaces 10121, the plurality of first covering surfaces 10121 including a first surface 10122, a second surface 10123 and a third surface 10124. The first surface 10122 is disposed away from the electrode assembly 20, the third surface 10124 is disposed towards the electrode assembly 20, and the second surface 10123 is connected between the first surface 10122 and the second surface 10123. The second surface 10123 surrounds and forms a first through hole 1011. At least a portion of the first surface 10122 covers the first insulator portion 51. In the direction from the fifth surface 3013 to the second surface 10123, the first insulator portion 51 covering the first surface 10122 protrudes from the side of the first limiting protrusion 3111 away from the fifth surface 3013. Looking along the axial direction of the first through hole 1011, a portion of the first insulator portion 51 covering the first surface 10122 is shielded by the first limiting protrusion 3111, while another portion is exposed outside the first limiting protrusion 3111. The outer region of the first surface 10122 directly opposite the first limiting protrusion 3111 is also covered by the first insulator portion 51. The insulation coverage area of ​​the first surface 10122 is large. When the first insulating member 40 softens or melts, the first insulator portion 51 can completely separate the first limiting protrusion 3111 and the first surface 10122. The first insulator portion 51 can better insulate and separate the first surface 10122 and the first limiting protrusion 3111, which is beneficial to improving the insulation reliability of the electrode terminal 30 and the first sidewall 101.

[0293] As an example, the first limiting protrusion 3111 has a circular structure and is arranged around the electrode terminal 30. The first insulator portion 51 covering the first surface 10122 is circular. The inner diameter of the first insulator portion 51 covering the first surface 10122 is equal to the diameter of the first through hole 1011, and the outer diameter of the first insulator portion 51 covering the first surface 10122 is greater than the outer diameter of the first limiting protrusion 3111.

[0294] In some examples, the second insulator 50 includes a first insulator portion 51, and the first surface 1012 includes a plurality of first covering surfaces 10121, the plurality of first covering surfaces 10121 including a first surface 10122, a second surface 10123 and a third surface 10124. The first surface 10122 is disposed away from the electrode assembly 20, the third surface 10124 is disposed towards the electrode assembly 20, the second surface 10123 is connected between the first surface 10122 and the second surface 10123, and the second surface 10123 surrounds to form a first through hole 1011; at least a portion of the third surface 10124 covers the first insulator portion 51, and in the direction from the fifth surface 3013 to the second surface 10123, the first insulator portion 51 covering the third surface 10124 protrudes from the side of the second limiting protrusion 3121 away from the fifth surface 3013. Looking along the axial direction of the first through hole 1011, a portion of the first insulator portion 51 covering the third surface 10124 is shielded by the second limiting protrusion 3121, while another portion is exposed outside the second limiting protrusion 3121. The outer region of the third surface 10124 directly opposite the second limiting protrusion 3121 is also covered by the first insulator portion 51. The insulation coverage area of ​​the third surface 10124 is large. When the first insulating member 40 softens or melts, the first insulator portion 51 can completely separate the second limiting protrusion 3121 and the third surface 10124. The first insulator portion 51 can better insulate and separate the third surface 10124 and the second limiting protrusion 3121, which is beneficial to improving the insulation reliability of the electrode terminal 30 and the first sidewall 101.

[0295] As an example, the second limiting protrusion 3121 has a ring-shaped structure and is arranged around the electrode terminal 30. The first insulator portion 51 covering the third surface 10124 is ring-shaped. The inner diameter of the first insulator portion 51 covering the third surface 10124 is equal to the diameter of the first through hole 1011, and the outer diameter of the first insulator portion 51 covering the third surface 10124 is greater than the outer diameter of the second limiting protrusion 3121.

[0296] In some examples, in some embodiments, the second insulating member 50 includes a first insulator portion 51, and the first surface 1012 includes a plurality of first covering surfaces 10121, the plurality of first covering surfaces 10121 including a first surface 10122, a second surface 10123 and a third surface 10124. The first surface 10122 is disposed away from the electrode assembly 20, the third surface 10124 is disposed towards the electrode assembly 20, and the second surface 10123 is connected between the first surface 10122 and the second surface 10123, and the second surface 10123 surrounds and forms a first through hole 1011; at least a portion of the first surface 10122 covers the first insulator portion 51 and points along the fifth surface 3013 toward the second surface. In the direction of 10123, the first insulator portion 51 covering the first surface 10122 protrudes from the side of the first limiting protrusion 3111 away from the fifth surface 3013; at least a portion of the third surface 10124 is covered by the first insulator portion 51, and in the direction from the fifth surface 3013 to the second surface 10123, the first insulator portion 51 covering the third surface 10124 protrudes from the side of the second limiting protrusion 3121 away from the fifth surface 3013, so that when the first insulating member 40 softens or melts, the first insulator portion 51 can better insulate and separate the electrode terminal 30 and the first sidewall 101, which is beneficial to improving the insulation reliability of the electrode terminal 30 and the first sidewall 101.

[0297] By adopting the technical solution of this embodiment, when the first insulating member 40 softens or melts, the first insulator portion 51 can better insulate and separate the electrode terminal 30 and the first sidewall 101, which is beneficial to improving the insulation reliability of the electrode terminal 30 and the first sidewall 101.

[0298] In some embodiments, the first insulating member 40 includes a first insulating region 41, a second insulating region 42, and a third insulating region 43 connected to each other. At least a portion of the first insulating region 41 is located between a first surface 10122 and a fourth surface 3012, the second insulating region 42 is located between a second surface 10123 and a fifth surface 3013, and at least a portion of the third insulating region 43 is located between a third surface 10124 and a sixth surface 3014.

[0299] Electrode terminal 30 is inserted into first insulating member 40, which is inserted into first through hole 1011. First insulating member 40 is clamped and fixed between the hole wall of first through hole 1011 and electrode terminal 30. The portion of first insulating member 40 between first surface 10122 and fourth surface 3012 is first insulating region 41, the portion of first insulating member 40 between second surface 10123 and fifth surface 3013 is second insulating region 42, and the portion of first insulating member 40 between third surface 10124 and sixth surface 3014 is third insulating region 43. The first insulating region 41 may be completely located between the first surface 10122 and the fourth surface 3012, or a portion of the first insulating region 41 may be located between the first surface 10122 and the fourth surface 3012, with the other portion encircling the outer periphery of the first limiting protrusion 3111 to shield the side of the first limiting protrusion 3111 away from the fifth surface 3013, thereby better achieving insulation of the electrode terminal 30. The third insulating region 43 may be completely located between the third surface 10124 and the sixth surface 3014, or a portion of the third insulating region 43 may be located between the third surface 10124 and the sixth surface 3014, with the other portion encircling the outer periphery of the second limiting protrusion 3121 to shield the side of the second limiting protrusion 3121 away from the fifth surface 3013, thereby better achieving insulation of the electrode terminal 30.

[0300] The first insulating region 41, the second insulating region 42, and the third insulating region 43 can be integrally formed or formed separately and then connected together. The first insulating region 41, the second insulating region 42, and the third insulating region 43 can be arranged to form a U-shaped structure. The first insulating member 40 is inserted into the groove formed by the fourth surface 3012, the fifth surface 3013, and the sixth surface 3014. The edge of the first sidewall 101 near the first through hole 1011 is inserted into the U-shaped structure, thereby achieving the fixation of the electrode terminal 30 and the insulation between the electrode terminal 30 and the first sidewall 101.

[0301] By adopting the technical solution of this embodiment, the fourth surface 3012 of the electrode terminal 30 is insulated from the first surface 10122 of the first sidewall 101 by the first insulating region 41, the fifth surface 3013 of the electrode terminal 30 is insulated from the second surface 10123 of the first sidewall 101 by the second insulating region 42, and the sixth surface 3014 of the electrode terminal 30 is insulated from the third surface 10124 of the first sidewall 101 by the third insulating region 43. This achieves three-sided insulation between the electrode terminal 30 and the first sidewall 101, which is beneficial to improving the insulation effect between the electrode terminal 30 and the first sidewall 101 and improving the reliability of the battery cell 100.

[0302] In some embodiments, at least a portion of the first surface 10122 is covered by the first insulator portion 51, and the first insulator portion 51 covering the first surface 10122 protrudes from the side of the first insulating region 41 away from the fifth surface 3013 in the direction from the fifth surface 3013 to the second surface 10123; and / or, at least a portion of the third surface 10124 is covered by the first insulator portion 51, and the first insulator portion 51 covering the third surface 10124 protrudes from the side of the third insulating region 43 away from the fifth surface 3013 in the direction from the fifth surface 3013 to the second surface 10123.

[0303] In some examples, at least a portion of the first surface 10122 is covered by the first insulator portion 51. Along the direction from the fifth surface 3013 to the second surface 10123, the first insulator portion 51 covering the first surface 10122 protrudes from the side of the first insulating region 41 away from the fifth surface 3013. Viewed axially along the first through hole 1011, the first insulator portion 51 covering the first surface 10122 protrudes from the first insulating region 41. The outer region of the first surface 10122 directly opposite the first insulating region 41 is also covered by the first insulator portion 51. The insulating coverage area of ​​the first surface 10122 is large, and the first insulating region 41 and the first surface 10122 can be completely separated by the first insulator portion 51. When the first insulating member 40 softens or melts, the first insulator portion 51 has a good insulating effect in separating the first surface 10122 and the first insulating region 41, which is beneficial to improving the insulation reliability of the electrode terminal 30 and the first sidewall 101.

[0304] As an example, the first insulating region 41 has a ring-shaped structure and is arranged around the electrode terminal 30. The first insulator 51 covering the first surface 10122 has a ring-shaped structure and the outer diameter of the first insulator 51 covering the first surface 10122 is larger than the outer diameter of the first insulating region 41.

[0305] In some examples, at least a portion of the third surface 10124 is covered by the first insulator portion 51. Along the direction from the fifth surface 3013 to the second surface 10123, the first insulator portion 51 covering the third surface 10124 protrudes from the side of the third insulating region 43 away from the fifth surface 3013. Viewed axially along the first through hole 1011, the first insulator portion 51 covering the third surface 10124 protrudes beyond the third insulating region 43. The outer regions of the third surface 10124 and the third insulating region 43 are also covered by the first insulator portion 51. The insulating coverage area of ​​the third surface 10124 is large, and the third insulating region 43 and the third surface 10124 can be completely separated by the first insulator portion 51. When the first insulating member 40 softens or melts, the first insulator portion 51 provides good insulation by effectively separating the third surface 10124 and the third insulating region 43, which is beneficial for improving the insulation reliability of the electrode terminal 30 and the first sidewall 101.

[0306] As an example, the third insulating region 43 has a ring-shaped structure and is arranged around the electrode terminal 30. The first insulator 51 covering the third surface 10124 has a ring-shaped structure and the outer diameter of the first insulator 51 covering the third surface 10124 is larger than the outer diameter of the third insulating region 43.

[0307] In some examples, at least a portion of the first surface 10122 is covered by the first insulator portion 51. In the direction from the fifth surface 3013 to the second surface 10123, the first insulator portion 51 covering the first surface 10122 protrudes from the side of the first insulating region 41 away from the fifth surface 3013. At least a portion of the third surface 10124 is covered by the first insulator portion 51. In the direction from the fifth surface 3013 to the second surface 10123, the first insulator portion 51 covering the third surface 10124 protrudes from the side of the third insulating region 43 away from the fifth surface 3013. This allows the first insulator portion 51 to better insulate and separate the electrode terminal 30 and the first sidewall 101 when the first insulating member 40 softens or melts, which is beneficial to improving the insulation reliability of the electrode terminal 30 and the first sidewall 101.

[0308] By adopting the technical solution of this embodiment, when the first insulating member 40 softens or melts, the first insulator portion 51 can better insulate and separate the electrode terminal 30 and the first sidewall 101, which is beneficial to improving the insulation reliability of the electrode terminal 30 and the first sidewall 101.

[0309] In some embodiments, the second insulating member 50 includes a third insulating portion 54, and at least a portion of the side of the first limiting protrusion 3111 away from the fifth surface 3013 along the radial direction of the first through hole 1011 covers the third insulating portion 54; and / or, the second insulating member 50 includes a fourth insulating portion 55, and at least a portion of the side of the second limiting protrusion 3121 away from the fifth surface 3013 along the radial direction of the first through hole 1011 covers the fourth insulating portion 55.

[0310] In some examples, the second insulating member 50 includes a third insulating portion 54, and at least a portion of the side of the first limiting protrusion 3111 away from the fifth surface 3013 along the radial direction of the first through hole 1011 is covered by the third insulating portion 54; a portion of the side of the first limiting protrusion 3111 away from the fifth surface 3013 is covered by the third insulating portion 54, or the entire side of the first limiting protrusion 3111 away from the fifth surface 3013 is covered by the third insulating portion 54; when the first insulating member 40 softens or melts, the third insulating portion 54 can insulatingly separate the side of the first limiting protrusion 3111 away from the fifth surface 3013 from the first sidewall 101, thereby improving the insulation reliability between the electrode terminal 30 and the first sidewall 101.

[0311] In some examples, the second insulating member 50 includes a fourth insulating portion 55, and at least a portion of the side of the second limiting protrusion 3121 away from the fifth surface 3013 along the radial direction of the first through hole 1011 is covered by the fourth insulating portion 55; a portion of the side of the second limiting protrusion 3121 away from the fifth surface 3013 is covered by the fourth insulating portion 55, or the entire side of the second limiting protrusion 3121 away from the fifth surface 3013 is covered by the fourth insulating portion 55; when the first insulating member 40 softens or melts, the fourth insulating portion 55 can insulatingly separate the side of the second limiting protrusion 3121 away from the fifth surface 3013 from the first sidewall 101, thereby improving the insulation reliability between the electrode terminal 30 and the first sidewall 101.

[0312] In some examples, the second insulating member 50 includes a third insulating portion 54, with at least a portion of the side of the first limiting protrusion 3111 away from the fifth surface 3013 covering the third insulating portion 54 along the radial direction of the first through hole 1011; the second insulating member 50 also includes a fourth insulating portion 55, with at least a portion of the side of the second limiting protrusion 3121 away from the fifth surface 3013 covering the fourth insulating portion 55 along the radial direction of the first through hole 1011. This allows the second insulating member 50 to better insulate and separate the electrode terminal 30 and the first sidewall 101 when the first insulating member 40 softens or melts, thereby improving the insulation reliability between the electrode terminal 30 and the first sidewall 101.

[0313] By adopting the technical solution of this embodiment, when the first insulating member 40 softens or melts, the second insulating member 50 can better insulate and separate the electrode terminal 30 and the first sidewall 101, which is beneficial to improving the insulation reliability of the electrode terminal 30 and the first sidewall 101.

[0314] In some embodiments, the second insulating member 50 includes a fifth insulating portion 56, the electrode terminal 30 has a second end face 303, the second end face 303 is disposed toward the electrode assembly 20, the second end face 303 includes a third portion 3031 and a fourth portion 3032, the electrode assembly 20 is connected to the third portion 3031, the fourth portion 3032 is not electrically connected to the electrode assembly 20, and the fourth portion 3032 is covered by the fifth insulating portion 56.

[0315] Along the axial direction of the first through hole 1011, the surface of the electrode terminal 30 facing the electrode assembly 20 is the second end face 303. The second end face 303 is electrically connected to the tab of the electrode assembly 20 to input and output electrical energy of the battery cell 100. The second end face 303 is divided into two parts, one part of which is connected to the tab of the electrode assembly 20, namely the third part 3031, and the other part is not connected to the tab of the electrode assembly 20, namely the fourth part 3032.

[0316] The third part 3031 is not covered by the fifth insulating part 56, a part of the fourth part 3032 is covered by the fifth insulating part 56, or the entire fourth part 3032 is covered by the fifth insulating part 56.

[0317] By adopting the technical solution of this embodiment, the third part 3031 is not covered by the fifth insulating part 56, which can reduce the impact of the fifth insulating part 56 on the electrical connection between the electrode assembly 20 and the electrode terminal 30, and is conducive to improving the connection reliability of the electrode assembly 20 and the electrode terminal 30; the fourth part 3032 is covered by the fifth insulating part 56, which can increase the insulation performance of the electrode terminal 30, reduce the short circuit risk of the battery cell 100, and is conducive to improving the reliability of the battery cell 100.

[0318] In some embodiments, the thickness of the fifth insulating portion 56 is T9, wherein 0 < T9 ≤ 30 μm.

[0319] As an example, the thickness T9 of the fifth insulating portion 56 can be 30 μm or any number between 0 μm and 30 μm. For example, the thickness T9 of the fifth insulating portion 56 can be, but is not limited to, 1 μm, 5 μm, 8 μm, 10 μm, 12 μm, 15 μm, 20 μm, 25 μm, or 30 μm.

[0320] The design with T9 > 0 μm allows the second end face 303 to cover the fifth insulating portion 56, increasing the insulation area of ​​the electrode terminal 30 and improving its insulation performance, which is beneficial to improving the reliability of the battery cell 100. Furthermore, the design with T9 ≤ 30 μm reduces the space occupied by the fifth insulating portion 56, reducing material waste and the manufacturing difficulty of the fifth insulating portion 56. The thinness of the fifth insulating portion 56 also makes it easier to damage, facilitating the welding of the electrode terminal 30 and the electrode assembly 20's tabs. Therefore, it effectively balances the insulation performance of the electrode terminal 30, the structural compactness of the battery cell 100, and the electrical connection between the electrode assembly 20 and the electrode terminal 30.

[0321] In some embodiments, 0 < T9 ≤ 15 μm can better balance the insulation performance of the electrode terminal 30 and the structural compactness of the battery cell 100.

[0322] In some embodiments, the electrode terminal 30 is an aluminum terminal, and the outer surface of the electrode terminal 30 is formed into a second insulating element 50 by an oxidation process or a nitriding process.

[0323] The electrode terminal 30 is made of aluminum. The surface of the aluminum can be oxidized or nitrided to obtain aluminum oxide (Al2O3) or aluminum nitride (AlN). Aluminum oxide and aluminum nitride have high temperature resistance and good insulation properties, so that when the first insulating component 40 softens or melts, the electrode terminal 30 and the first sidewall 101 can be insulated.

[0324] By adopting the technical solution of this embodiment, the electrode terminal 30 is made of aluminum, and the second insulating component 50 is made by the surface of the electrode terminal 30 through an oxidation process or a nitriding process. The processing method is simple and helps to reduce the manufacturing cost of the electrode terminal 30.

[0325] In some embodiments, aluminum oxide (Al2O3) or aluminum nitride (AlN) covers the fourth surface 3012, fifth surface 3013, sixth surface 3014, first end surface 302, and second end surface 303 of the electrode terminal 30, thereby covering the entire outer surface of the electrode terminal 30. The aluminum oxide or aluminum nitride obtained by the oxidation or nitriding process of the entire outer surface of the electrode terminal 30 is simple to manufacture and helps to reduce manufacturing costs. During the welding process, the aluminum oxide and aluminum nitride are destroyed, thereby making the first end surface 302 stably welded to the bus component and the second end surface 303 and the tab of the electrode assembly 20. In other examples, aluminum oxide or aluminum nitride may only cover the fourth surface 3012, fifth surface 3013, and sixth surface 3014 of the electrode terminal 30, and of course, there are other covering methods.

[0326] In some embodiments, the entire outer surface of the end body 31 is subjected to an oxidation or nitriding process to obtain the second insulating element 50. This whole-surface oxidation or nitriding process is simple and helps to reduce manufacturing costs.

[0327] In some embodiments, the material of the second insulating member 50 includes at least one of Al2O3 (alumina), ZrO2 (zirconia), MgSiO3 (magnesium silicate), AlN (aluminum nitride), BN (boron nitride), SiC (silicon carbide), and thermosetting polyimide.

[0328] By adopting the technical solution of this embodiment, the second insulating member 50 uses the above-mentioned material, which can insulate and separate the first sidewall 101 and the electrode terminal 30 when the first insulating member 40 softens or melts, thereby improving the reliability of the battery cell 100.

[0329] In some embodiments, the housing 10 includes an end cap 11 and a housing 12, the housing 12 surrounding a receiving cavity 102, the end cap 11 covering the opening of the receiving cavity 102, and the sidewalls of the housing 12 opposite to the end cap 11 forming a first sidewall 101.

[0330] Electrode terminals 30 are disposed on housing 12, and electrode terminals 30 and end caps 11 are located on opposite sides of battery cell 100.

[0331] By adopting the technical solution of this embodiment, the electrode terminal 30 is disposed on the housing 12, which can increase the overall structural stability of the battery cell 100 and improve the reliability of the battery cell 100.

[0332] In some embodiments, the electrode assembly 20 includes a body 21 and a first tab 22 and a second tab 23 of different polarities. The first tab 22 is led out from the end of the body 21 facing the end cap 11, and the second tab 23 is led out from the end of the body 21 facing the first sidewall 101. The first tab 22 is electrically connected to the end cap 11, and the second tab 23 is electrically connected to the electrode terminal 30.

[0333] The positive electrode body, the negative electrode body, and the insulating member together form the body 21. One of the first electrode tab 22 and the second electrode tab 23 is the positive electrode tab, and the other is the negative electrode tab. The first electrode tab 22 and the second electrode tab 23 are respectively located at opposite ends of the body 21, which can reduce the risk of short circuit between the first electrode tab 22 and the second electrode tab 23.

[0334] The first tab 22 is electrically connected to the end cap 11, so that the end cap 11 or the housing 12 can serve as one output pole of the battery cell 100. The second tab 23 is electrically connected to the electrode terminal 30, so that the electrode terminal 30 serves as the other output pole of the battery cell 100. The first insulating member 40 and the second insulating member 50 can separate the electrode terminal 30 and the housing 12 with double insulation, which can better improve the insulation reliability of the electrode terminal 30 and the housing 12, and better reduce the short circuit risk of the battery cell 100, which is conducive to improving the reliability of the battery cell 100. In addition, the end cap 11 and the housing 12 serve as the output poles of the battery cell 100, which can facilitate the mutual electrical connection between the battery cells 100, and can also simplify the structure of the battery cell 100 and facilitate processing and manufacturing.

[0335] In some embodiments, the battery cell 100 is a cylindrical battery cell 100 or a prismatic battery cell 100.

[0336] The battery cell 100 is a cylindrical battery cell 100, the outer casing 10 of the battery cell 100 is cylindrical, and the electrode assembly 20 is cylindrical.

[0337] The battery cell 100 is a prismatic battery cell 100, the outer casing 10 of the battery cell 100 is prismatic, and the electrode assembly 20 is cylindrical or prismatic.

[0338] The technical solutions of this application embodiment can be applied to cylindrical battery cells 100 and prismatic battery cells 100, and have a wide range of applications.

[0339] The present application will be described below with reference to some specific embodiments.

[0340] Example 1

[0341] In this embodiment, the battery cell 100 is a cylindrical battery cell 100. The battery cell 100 includes a shell 10, an electrode assembly 20, an electrode terminal 30, a first insulating member 40, and a second insulating member 50. The shell 10 includes an end cap 11 and a housing 12. The electrode assembly 20 is disposed inside the housing 12. The end cap 11 covers the opening of the housing 12. The sidewalls of the housing 12 opposite to the end cap 11 form a first sidewall 101. The first sidewall 101 has a first through hole 1011. The electrode terminal 30 is installed in the first through hole 1011. The first insulating member 40 is disposed between the electrode terminal 30 and the first sidewall 101 to insulatingly separate the first sidewall 101 and the electrode terminal 30. The second insulating member 50 is disposed between the first insulating member 40 and the electrode terminal 30, and between the first insulating member 40 and the first sidewall 101. The heat resistance of the second insulating member 50 is greater than that of the first insulating member 40.

[0342] In this embodiment, the melting point of the second insulating member 50 is greater than the melting point of the first insulating member 40, or the thermal weight loss temperature of the second insulating member 50 is greater than the melting point of the first insulating member 40.

[0343] In this embodiment, the first sidewall 101 includes a first surface 1012, the outer surface of the electrode terminal 30 includes a second surface 301, the first surface 1012 and the second surface 301 are disposed opposite to each other, the second insulating member 50 includes a first insulator portion 51, the first surface 1012 includes a plurality of first covering surfaces 10121, the plurality of first covering surfaces 10121 include a first surface 10122, a second surface 10123 and a third surface 10124, the first surface 10122 is disposed away from the electrode assembly 20, the third surface 10124 is disposed towards the electrode assembly 20, the second surface 10123 is connected between the first surface 10122 and the second surface 10123, and the second surface 10123 surrounds and forms a first through hole 1011; the first surface 10122, the second surface 10123 and the third surface 10124 cover the first insulator portion 51.

[0344] In this embodiment, the electrode terminal 30 is an aluminum terminal, and the outer surface of the electrode terminal 30 is made of aluminum oxide or aluminum nitride by an oxidation process or a nitriding process, and the aluminum oxide or aluminum nitride forms the second insulating element 50.

[0345] Example 2

[0346] The difference between this embodiment and Embodiment 1 is that the outer peripheral surface of the electrode terminal 30 is covered with a layer of thermosetting polyimide, which forms the second insulating element 50.

[0347] In some embodiments, referring to FIG5, a battery device 1100 is provided, including a plurality of the above-described battery cells 100.

[0348] The battery device 1100 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 100, which are connected in series, parallel, or mixed connections via busbars.

[0349] In some examples, a battery cell assembly is typically formed by arranging multiple battery cells 100 together.

[0350] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells 100 together to form an independent module. As an example, a battery module can also be formed by bundling multiple battery cells 100 together with cable ties.

[0351] In some examples, the battery device 1100 may be a battery pack, which includes a housing 200 and one or more individual battery cells housed within the housing 200.

[0352] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing 200 by fixing the battery module in the housing 200.

[0353] As an example, the battery cell assembly can also be housed in the housing 200 by directly fixing multiple battery cells 100 to the housing 200.

[0354] As an example, the housing 200 may include a first housing 210 and a second housing 220. The first housing 210 and the second housing 220 are fastened together to form a closed space inside the housing 200 to house the battery cell assembly. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first housing 210 may be a top cover or a bottom plate.

[0355] As an example, the housing 200 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 200 forms an enclosed space to accommodate the battery cell assembly.

[0356] In some examples, the housing 200 may be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 200 may be at least a portion of the floor of the vehicle 1000, or a portion of the housing 200 may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000.

[0357] The battery device 1100 of this application embodiment adopts the above-mentioned battery cell 100. The battery cell 100 has good reliability, which is beneficial to improving the reliability of the battery device 1100.

[0358] In some embodiments, referring to FIG6, an electrical device is provided, including the battery cell 100 or the battery device 1100 described above, wherein the battery cell 100 or the battery device 1100 is used to store or provide electrical energy.

[0359] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery cells 100, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles 1000, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0360] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device.

[0361] 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 is installed inside vehicle 1000, which can be located at the bottom, front, or rear of vehicle 1000. The battery can be used to power vehicle 1000; for example, the battery can serve as the operating power source for vehicle 1000. Vehicle 1000 may also include a controller 1200 and a motor 1300. The controller 1200 is used to control the battery to supply power to the motor 1300, for example, to meet the power needs of vehicle 1000 during starting, navigation, and driving.

[0362] In some embodiments of this application, the battery 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.

[0363] The electrical device in this application embodiment uses the aforementioned battery cell 100 or the aforementioned battery device 1100. The battery cell 100 and the battery device 1100 have good reliability, which helps to improve the reliability of the electrical device.

[0364] The description of the various embodiments above tends to emphasize the differences between the various embodiments. The similarities or similarities between them can be referred to, and for the sake of brevity, they will not be repeated here.

[0365] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. 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, wherein, include: The outer casing has a first sidewall and a receiving cavity, the first sidewall having a first through hole communicating with the receiving cavity; The electrode assembly is at least partially disposed within the receiving cavity; The electrode terminal is electrically connected to the electrode assembly through the first through hole; A first insulating element is disposed between the electrode terminal and the first sidewall to insulatingly separate the electrode terminal and the first sidewall; A second insulating element is provided between at least a portion of the first insulating element and the electrode terminal, and / or, a second insulating element is provided between at least a portion of the first insulating element and the first sidewall; The heat resistance of the second insulating component is greater than that of the first insulating component.

2. The battery cell according to claim 1, wherein: The melting point of the second insulating component is greater than that of the first insulating component, or the thermal weight loss temperature of the second insulating component is greater than that of the first insulating component.

3. The battery cell according to claim 1, wherein: The melting point or thermal weight loss temperature of the second insulating component is greater than or equal to 300°C. Optionally, the melting point or thermal weight loss temperature of the second insulating component is greater than or equal to 500°C. Optionally, the melting point or thermal weight loss temperature of the second insulating component is greater than or equal to 700°C.

4. The battery cell according to any one of claims 1 to 3, wherein: The resistivity of the second insulating component is greater than or equal to 1*10. 12 Ω·cm.

5. The battery cell according to any one of claims 1 to 4, wherein: The first sidewall includes a first surface, the outer surface of the electrode terminal includes a second surface, the first surface and the second surface are disposed opposite to each other, and the first insulating member and the second insulating member are located between the first surface and the second surface.

6. The battery cell according to claim 5, wherein: A second insulating member is provided between the first insulating member and the first sidewall, and the second insulating member covers at least a portion of the first surface.

7. The battery cell according to claim 6, wherein: The second insulating member includes a first insulator portion, and the first surface includes a plurality of first covering surfaces, at least a portion of at least one of the first covering surfaces covering the first insulator portion.

8. The battery cell according to claim 7, wherein: The thickness of the first insulator part is T1, wherein 5μm≤T1≤100μm, and optionally, 10μm≤T1≤30μm.

9. The battery cell according to claim 7 or 8, wherein: The plurality of first covering surfaces include a first surface, a second surface, and a third surface. The first surface is disposed away from the electrode assembly, the third surface is disposed towards the electrode assembly, and the second surface is connected between the first surface and the second surface, and the second surface surrounds and forms the first through hole. At least one of the first surface, at least one of the second surface, and at least one of the third surface is covered by the first insulator portion.

10. The battery cell according to any one of claims 5 to 9, wherein: The outer surface of the electrode terminal is covered by the second insulating member, which includes a first insulating portion that covers at least a portion of the second surface.

11. The battery cell according to claim 10, wherein: The area of ​​the outer surface of the electrode terminal is S1, and the area covered by the second insulating element on the electrode terminal is S2, wherein 0.35≤S2 / S1≤0.85, and optionally, 0.45≤S2 / S1≤0.

75.

12. The battery cell according to claim 10 or 11, wherein: The second insulating member includes a second insulating portion, and the outer surface of the electrode terminal includes a first end face, which is disposed away from the electrode assembly, and at least a portion of the first end face is covered by the second insulating portion.

13. The battery cell according to claim 12, wherein: The first end face includes a first portion and a second portion. The first portion is used for electrical connection with the busbar component, and the second portion is not used for electrical connection with the busbar component. The first portion is not covered by the second insulating portion, and at least a portion of the second portion is covered by the second insulating portion.

14. The battery cell according to claim 13, wherein: The electrode terminal further includes an end body and a cap body. The end body is electrically connected to the electrode assembly and passes through the first through hole. The end face of the end body facing away from the electrode assembly includes a recessed portion and a planar portion. The recessed portion is recessed relative to the planar portion toward the electrode assembly to form a recessed space. At least a portion of the cap is installed in the recessed space. The side of the cap facing away from the electrode assembly and the planar portion together form the first end face.

15. The battery cell according to claim 14, wherein: The first part is formed on the side of the cap facing away from the electrode assembly, and the second part is formed on the flat part; or, the first part is formed on the flat part, and the second part is formed on the side of the cap facing away from the electrode assembly.

16. The battery cell according to any one of claims 12 to 15, wherein: The thickness of the second insulating part is T2, wherein 0 < T2 ≤ 100 μm, and optionally, 0 < T2 ≤ 30 μm.

17. The battery cell according to any one of claims 10 to 13, wherein: The first insulating portion includes a second insulator portion, and the second surface includes a plurality of second covering surfaces, at least a portion of at least one of the second covering surfaces covering the second insulator portion.

18. The battery cell according to claim 17, wherein: The thickness of the second insulator part is T3, wherein 5μm≤T3≤100μm, and optionally, 10μm≤T3≤30μm.

19. The battery cell according to claim 18, wherein: The plurality of second covering surfaces include a fourth surface, a fifth surface, and a sixth surface; The electrode terminal includes a first limiting part, a second limiting part, and a connecting part connected between the first limiting part and the second limiting part; The connecting portion passes through the first through hole, the first limiting portion is located on the side of the first sidewall facing away from the electrode assembly, and the second limiting portion is located inside the receiving cavity; the first limiting portion protrudes from the outer peripheral surface of the connecting portion and forms a first limiting protrusion, the second limiting portion protrudes from the outer peripheral surface of the connecting portion and forms a second limiting protrusion, and a portion of the first sidewall is located between the first limiting portion and the second limiting portion; The outer peripheral surface of the connecting portion forms the fifth surface, the side of the first limiting protrusion facing the electrode assembly forms the fourth surface, and the side of the second limiting protrusion facing away from the electrode assembly forms the sixth surface.

20. The battery cell according to claim 19, wherein: At least a portion of the fourth surface is covered by the second insulator portion.

21. The battery cell according to claim 20, wherein: The thickness of the second insulator portion covering the fourth surface is T4, and the dimension of the first limiting protrusion along the axial direction of the first through hole is T5, wherein 0.005≤T4 / T5≤0.

2.

22. The battery cell according to any one of claims 19 to 21, wherein: At least a portion of the fifth surface is covered by the second insulator portion.

23. The battery cell according to claim 22, wherein: The thickness of the second insulator portion covering the fifth surface is T6, and the radial dimension of the connection portion is D1, wherein 0.0003≤T6 / (D1+2T6)≤0.

05.

24. The battery cell according to any one of claims 19 to 23, wherein: At least a portion of the sixth surface is covered by the second insulator portion.

25. The battery cell according to claim 24, wherein: The thickness of the second insulator portion covering the sixth surface is T7, and the size of the second limiting protrusion along the axial direction of the first through hole is T8, wherein 0.005≤T7 / T8≤0.

2.

26. The battery cell according to any one of claims 19 to 25, wherein: The second insulating member includes a first insulator portion. The first surface includes a plurality of first covering surfaces, the plurality of first covering surfaces including a first surface, a second surface and a third surface. Along the axial direction of the first through hole, the first surface is disposed away from the electrode assembly, the third surface is disposed towards the electrode assembly, and the second surface is connected between the first surface and the second surface, and the second surface surrounds to form the first through hole. At least a portion of the first surface covers the first insulator portion, and in the direction from the fifth surface to the second surface, the first insulator portion covering the first surface protrudes from the side of the first limiting protrusion away from the fifth surface; And / or, at least a portion of the third surface covers the first insulator portion, and in the direction from the fifth surface to the second surface, the first insulator portion covering the third surface protrudes from the side of the second limiting protrusion away from the fifth surface.

27. The battery cell according to claim 26, wherein: The first insulating member includes a first insulating region, a second insulating region, and a third insulating region connected together. At least a portion of the first insulating region is located between the first surface and the fourth surface, the second insulating region is located between the second surface and the fifth surface, and at least a portion of the third insulating region is located between the third surface and the sixth surface.

28. The battery cell according to claim 27, wherein: At least a portion of the first surface covers the first insulator portion, and in the direction from the fifth surface to the second surface, the first insulator portion covering the first surface protrudes from the side of the first insulating area away from the fifth surface; And / or, at least a portion of the third surface covers the first insulator portion, and in the direction from the fifth surface to the second surface, the first insulator portion covering the third surface protrudes from the side of the third insulating region away from the fifth surface.

29. The battery cell according to any one of claims 19 to 28, wherein: The second insulating member includes a third insulating portion, and at least a portion of the side of the first limiting protrusion away from the fifth surface covers the third insulating portion along the radial direction of the first through hole; And / or, the second insulating member includes a fourth insulating portion along the radial direction of the first through hole, the second limiting protrusion being located away from the fifth... At least a portion of the side surface of the surface is covered by the fourth insulating portion.

30. The battery cell according to any one of claims 10 to 29, wherein: The second insulating member includes a fifth insulating portion. The electrode terminal has a second end face along the axial direction of the first through hole. The second end face is disposed toward the electrode assembly. The second end face includes a third portion and a fourth portion. The electrode assembly is connected to the third portion. The fourth portion is not electrically connected to the electrode assembly. The fourth portion is covered by the fifth insulating portion.

31. The battery cell according to claim 30, wherein: The thickness of the fifth insulating part is T9, wherein 0 < T9 ≤ 30 μm, and optionally, 0 < T9 ≤ 15 μm.

32. The battery cell according to any one of claims 10 to 31, wherein: The electrode terminal is an aluminum terminal, and the outer surface of the electrode terminal is formed into the second insulating component by an oxidation process or a nitriding process.

33. The battery cell according to any one of claims 1 to 32, wherein: The material of the second insulating component includes at least one of Al2O3, ZrO2, MgSiO3, AlN, BN, SiC, and thermosetting polyimide.

34. The battery cell according to any one of claims 1 to 33, wherein: The outer casing includes an end cap and a housing, the housing enclosing the receiving cavity, the end cap covering the opening of the receiving cavity, and the sidewall of the housing opposite to the end cap forming the first sidewall.

35. The battery cell according to claim 34, wherein: The electrode assembly includes a body and a first electrode tab and a second electrode tab with different polarities. The first electrode tab extends from the end of the body facing the end cap, and the second electrode tab extends from the end of the body facing the first sidewall. The first electrode tab is electrically connected to the end cap, and the second electrode tab is electrically connected to the electrode terminal.

36. The battery cell according to any one of claims 1 to 35, wherein: The battery cell is a cylindrical battery cell or a prismatic battery cell.

37. A battery device, wherein: It includes multiple battery cells according to any one of claims 1 to 36.

38. An electrical appliance, wherein: Includes the battery cell according to any one of claims 1 to 36 or the battery device according to claim 37.

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