Battery monomer, battery device and electric device

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a single battery, a battery device and a power utilization device.The single battery comprises a shell, an electrode assembly, an electrode terminal, a first insulating part and a second insulating part, the shell is provided with a first side wall and a containing cavity, and the first side wall is provided with a first through hole communicated with the containing cavity; at least part of the electrode assembly is arranged in the accommodating cavity; the electrode terminal is electrically connected with the electrode assembly through the first through hole; the first insulating part is arranged between the electrode terminal and the first side wall so as to insulate and separate the electrode terminal from the first side wall; a second insulating part is arranged between at least part of the first insulating part and the electrode terminal, and / or a second insulating part is arranged between at least part of the first insulating part and the first side wall; wherein the heat resistance of the second insulating part is higher than that of the first insulating part.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of batteries, and particularly relates to a battery monomer, a battery device and a power utilization device. BACKGROUND

[0002] Battery monomers are widely used in electronic devices, such as mobile phones, notebook computers, electric vehicles, electric cars, electric planes, electric ships, electric toy cars, electric toy ships, electric toy planes and electric tools.

[0003] The shell of the battery monomer is provided with an electrode terminal to facilitate the input or output of the electric energy of the battery monomer, and the electrode terminal is insulated from the shell to reduce the risk of short circuit, and the insulation reliability between the electrode terminal and the shell will affect the use reliability of the battery monomer. How to improve the use reliability of the battery monomer is an important research direction in the technical field of batteries.

[0004] The above statements are only used to provide background technical information related to the application, and do not necessarily constitute the prior art. CONTENT OF THE INVENTION

[0005] The purpose of the embodiments of the application is to provide a battery monomer, a battery device and a power utilization device, which can improve the use reliability of the battery monomer.

[0006] The technical solution adopted by the embodiments of the application is:

[0007] In a first aspect, a battery monomer is provided, which comprises a shell, an electrode assembly, an electrode terminal, a first insulating member and a second insulating member. The shell has a first side wall and a receiving cavity, and the first side wall has a first through hole communicating with the receiving cavity. At least part of the electrode assembly is arranged in the receiving cavity. The electrode terminal is electrically connected with the electrode assembly through 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 and the first side wall. The second insulating member is arranged between at least part of the first insulating member and the electrode terminal, and / or the second insulating member is arranged between at least part of the first insulating member and the first side wall. The heat resistance of the second insulating member is greater than that of the first insulating member.

[0008] By adopting the technical scheme of the embodiment, the electrode assembly is arranged in the shell, the shell comprises a first side wall, the first side wall is provided with a first through hole, the electrode assembly is electrically connected with the electrode assembly through the first through hole, the first insulating piece is arranged between the electrode terminal and the first side wall, and the second insulating piece is arranged between at least part of the first insulating piece and the electrode terminal and / or between at least part of the first insulating piece and the first side wall, so that the first insulating piece and the second insulating piece can insulate and separate the electrode terminal and the first side wall, to realize stable input or output of the battery monomer electric energy. Since the heat resistance of the second insulating piece is greater than that of the first insulating piece, in the case that the electrode terminal is overheated or the battery monomer is in thermal runaway, the first insulating piece is softened or melted, the second insulating piece has a stable structure form, the second insulating piece insulates and separates the first side wall and the electrode terminal, reduces the risk of short circuit of the first side wall and the electrode terminal, and improves the use reliability of the battery monomer.

[0009] In some embodiments, the melting point of the second insulating piece is greater than the melting point of the first insulating piece.

[0010] By adopting the technical scheme of the embodiment, in the case that the temperature at the electrode terminal exceeds the melting point of the first insulating piece, the first insulating piece is softened or melted, but does not reach the melting point of the second insulating piece, the second insulating piece has a stable structure form, so as to stably insulate and separate the electrode terminal and the first side wall, reduce the short circuit risk of the battery monomer, and improve the use reliability of the battery monomer.

[0011] In some embodiments, the thermal gravimetric temperature of the second insulating piece is greater than the thermal gravimetric temperature of the first insulating piece.

[0012] By adopting the technical scheme of the embodiment, in the case that the temperature at the electrode terminal exceeds the thermal gravimetric temperature of the first insulating piece, the first insulating piece is softened or melted, but does not reach the thermal gravimetric temperature of the second insulating piece, the second insulating piece has a stable structure form, so as to stably insulate and separate the electrode terminal and the first side wall, reduce the short circuit risk of the battery monomer, and improve the use reliability of the battery monomer.

[0013] In some embodiments, the melting point or the thermal gravimetric temperature of the second insulating piece is greater than or equal to 300 DEG C, optionally, the melting point or the thermal gravimetric temperature of the second insulating piece is greater than or equal to 500 DEG C, optionally, the melting point or the thermal gravimetric temperature of the second insulating piece is greater than or equal to 700 DEG C.

[0014] By adopting the technical scheme of the embodiment, in the case that the first insulating piece is softened or melted, the second insulating piece has a stable structure form, so as to insulate and separate the first side wall and the electrode terminal.

[0015] In some embodiments, the resistivity of the second insulating piece is greater than or equal to 1*10 12Ω*cm.

[0016] By adopting the technical scheme of this embodiment, the second insulating member has good insulation performance, and when the first insulating member softens or melts, the second insulating member can stably insulate and separate the first side wall and the electrode terminal, reduces the risk of short circuit of the battery monomer, and is conducive to improving the use reliability of the battery monomer.

[0017] In some embodiments, the first side wall includes a first surface, an outer surface of the electrode terminal includes a second surface, the first surface and the second surface are oppositely arranged, and at least part of the first insulating member and at least part of the second insulating member are located between the first surface and the second surface.

[0018] By adopting the technical scheme of this embodiment, when the first insulating member softens and melts, the second insulating member can insulate and separate the first surface and the second surface of the first side wall and the electrode terminal from each other, and realize the insulation of the electrode terminal and the first side wall.

[0019] In some embodiments, a second insulating member is arranged between the first insulating member and the first side wall, and the second insulating member covers at least part of the first surface.

[0020] By adopting the technical scheme of this embodiment, the second insulating member covers the first surface of the shell, and when the first insulating member softens or melts, the second insulating member can insulate and separate the first surface of the electrode terminal and the second surface of the first side wall, so that the electrode terminal and the first side wall are insulated.

[0021] In some embodiments, the second insulating member includes a first insulating sub-member, the first surface includes a plurality of first covering surfaces, and at least part of at least one first covering surface is covered with the first insulating sub-member.

[0022] By adopting the technical scheme of this embodiment, when the first insulating member softens and melts, the first insulating sub-member covers the first covering surface, and the first insulating sub-member is located between the electrode terminal and the first side wall, and can insulate and separate the first side wall and the electrode terminal.

[0023] In some embodiments, the thickness of the first insulating sub-member is T1, and 5 μm≤T1≤100 μm, and optionally, 10 μm≤T1≤30 μm.

[0024] By adopting the technical scheme of this embodiment, when the first insulating member softens and melts, the first insulating sub-member can insulate and separate the first side wall and the electrode terminal; in addition, the space occupation of the first insulating sub-member can be reduced, the waste of materials and the manufacturing difficulty of the first insulating sub-member can be reduced. Therefore, the insulation of the electrode terminal and the first side wall and the compactness of the structure of the battery monomer can be better balanced.

[0025] In some embodiments, the plurality of first covering surfaces comprises a first surface, a second surface and a third surface, the first surface is arranged away from the electrode assembly, the third surface is arranged towards the electrode assembly, the second surface is connected between the first surface and the second surface, and the second surface forms the first through hole; at least one of at least part of the first surface, at least part of the second surface and at least part of the third surface is covered by the first insulating sub.

[0026] By adopting the technical scheme of this embodiment, when the first insulating member softens and melts, the first insulating sub is located between the electrode terminal and the first side wall, and can insulate and separate the first side wall and the electrode terminal.

[0027] In some embodiments, the outer surface of the electrode terminal is covered by a second insulating member, and the second insulating member comprises a first insulating part, and the first insulating part covers at least part of the second surface.

[0028] By adopting the technical scheme of this embodiment, when the first insulating member softens and melts, the first insulating part is located between the second surface and the first side wall, and can insulate and separate the first side wall and the electrode terminal; in addition, the electrode terminal has a simple structure, and the process of arranging the second insulating member on the outer surface of the electrode terminal is simple, and the electrode terminal is convenient to manufacture.

[0029] In some embodiments, the area of the outer surface of the electrode terminal is S1, and the covering 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.

[0030] By adopting the technical scheme of this embodiment, the electrode terminal is covered by the second insulating member, so that when the first insulating member softens or melts, the electrode terminal and the first side wall can be insulated and separated; the electrode terminal can flow out part of the area to be electrically connected with the current collecting component and the electrode assembly, thereby improving the connection reliability between the electrode terminal, the current collecting component and the electrode assembly, and improving the performance of the battery monomer; therefore, the insulation of the electrode terminal and the first side wall and the connection reliability between the electrode terminal, the current collecting component and the electrode assembly can be considered at the same time.

[0031] In some embodiments, the second insulating member comprises a second insulating part, and the outer surface of the electrode terminal comprises a first end surface, the first end surface is arranged away from the electrode assembly, and at least part of the first end surface is covered by the second insulating part.

[0032] By adopting the technical scheme of this embodiment, the first end surface of the electrode terminal is covered by the second insulating part, which can increase the insulation area of the electrode terminal, is conducive to improving the insulation effect of the electrode terminal, and is conducive to improving the use reliability of the battery monomer.

[0033] In some embodiments, the first end surface comprises a first part and a second part, the first part is used for electrical connection with the busbar component, and the second part is not used for electrical connection with the busbar component, the first part is not covered by the second insulation part, and at least part of the second part is covered by the second insulation part.

[0034] By adopting the technical scheme of this embodiment, the first part is not covered by the second insulation part, which can reduce the influence of the second insulation part on the electrical connection between the busbar component and the first part, and is conducive to the connection reliability of the battery monomer; at least part of the second part is covered by the second insulation part, which can increase the insulation area of the electrode terminal, improve the insulation performance of the electrode terminal, and reduce the short circuit risk of the battery monomer, and is conducive to improving the use reliability of the battery monomer.

[0035] In some embodiments, the electrode terminal further comprises a terminal body and a cap body, the terminal body is electrically connected with the electrode assembly, and the terminal body is arranged in the first through hole; an end surface of the terminal body away from the electrode assembly comprises a recessed part and a planar part, the recessed part is recessed towards the electrode assembly relative to the planar part to form a recessed space; at least part of the cap body is arranged in the recessed space, and a side surface of the cap body away from the electrode assembly and the planar part jointly form the first end surface.

[0036] By adopting the technical scheme of this embodiment, the electrode terminal adopts the structure of the terminal body and the cap body, which can facilitate the arrangement of the liquid injection hole in the electrode terminal, is conducive to simplifying the structure of the battery monomer, and improves the use reliability of the battery monomer.

[0037] In some embodiments, the side surface of the cap body away from the electrode assembly forms the first part, and the planar part forms the second part; or, the planar part forms the first part, and the side surface of the cap body away from the electrode assembly forms the second part.

[0038] By adopting the technical scheme of this embodiment, the busbar component can be electrically connected with the cap body or the terminal body, and the connection between the busbar component and the electrode terminal can be flexibly arranged to meet different use requirements; in addition, no second insulation part is arranged between the busbar component and the electrode terminal, which can reduce the influence of the second insulation part on the electrical connection between the busbar component and the electrode terminal, and is conducive to improving the performance of the battery monomer in inputting or outputting electric energy.

[0039] In some embodiments, the thickness of the second insulation part is T2, and 0 < T2 ≤ 100 μm, and optionally, 0 < T2 ≤ 30 μm.

[0040] By adopting the technical scheme of this embodiment, the first end surface can be covered by the second insulation part, which can increase the insulation area of the electrode terminal, improve the insulation performance of the electrode terminal, and is conducive to improving the use reliability of the battery monomer; in addition, the space occupied by the second insulation part can be reduced, and the material waste and the manufacturing difficulty of the second insulation part can be reduced. Therefore, the insulation performance of the electrode terminal and the compactness of the structure of the battery monomer can be well balanced.

[0041] In some embodiments, the first insulating part comprises a second insulating subpart, and the second surface comprises a plurality of second covering surfaces, at least part of at least one of the second covering surfaces being covered by the second insulating subpart.

[0042] By adopting the technical scheme of this embodiment, when the first insulating part softens and melts, the second insulating subpart covers the second covering surfaces, and the second insulating subpart is located between the electrode terminal and the first side wall, thereby insulating and separating the first side wall and the electrode terminal.

[0043] In some embodiments, the thickness of the second insulating subpart is T3, where 5 μm≤T3≤100 μm, and optionally, 10 μm≤T3≤30 μm.

[0044] By adopting the technical scheme of this embodiment, when the first insulating part softens and melts, the second insulating subpart can insulate and separate the first side wall and the electrode terminal. In addition, the space occupied by the second insulating subpart can be reduced, and the material waste and the manufacturing difficulty of the second insulating subpart can be reduced. Therefore, the insulation of the electrode terminal and the first side wall and the compactness of the battery monomer can be well balanced.

[0045] In some embodiments, the plurality of second covering surfaces comprises a fourth surface, a fifth surface, and a sixth surface; the electrode terminal comprises 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 part is arranged in the first through hole, the first limiting part is located on the side of the first side wall away from the electrode assembly, and the second limiting part is located in the accommodation cavity; the first limiting part protrudes from the outer peripheral surface of the connecting part and forms a first limiting protrusion, the second limiting part protrudes from the outer peripheral surface of the connecting part and forms a second limiting protrusion, and part of the first side wall is located between the first limiting part and the second limiting part; the outer peripheral surface of the connecting part forms the fifth surface, the fourth surface is formed by the side surface of the first limiting protrusion facing the electrode assembly, and the sixth surface is formed by the side surface of the second limiting protrusion away from the electrode assembly.

[0046] By adopting the technical scheme of this embodiment, the first limiting protrusion and the second limiting protrusion of the electrode terminal can be used to fix the electrode terminal, and the structure is simple, facilitating the assembly of the battery monomer.

[0047] In some embodiments, at least part of the fourth surface is covered by the second insulating subpart.

[0048] By adopting the technical scheme of this embodiment, when the first insulating part softens or melts, the second insulating subpart covering the fourth surface can be located between the fourth surface and the first side wall, thereby insulating and separating the first side wall and the electrode terminal.

[0049] In some embodiments, the thickness of the second insulating sub-portion covering the fourth surface is T4, and the size of the first limiting protrusion is T5 along the axial direction of the first through hole, where 0.005≤T4 / T5≤0.2.

[0050] By adopting the technical scheme of this embodiment, in the case of a certain T5, the design of T4 / T5≥0.005 enables the second insulating sub-portion to insulate the fourth surface and the first side wall when the first insulating member softens and melts, thereby achieving insulation between the electrode terminal and the first side wall. In addition, the design of T4 / T5≤0.2 can reduce the space occupation of the second insulating sub-portion and reduce material waste. Therefore, the insulation between the electrode terminal and the first side wall and the compactness of the battery monomer can be well balanced.

[0051] In some embodiments, at least part of the fifth surface is covered with the second insulating sub-portion.

[0052] By adopting the technical scheme of this embodiment, when the first insulating member softens or melts, the second insulating sub-portion covering the fifth surface can be located between the fifth surface and the first side wall, thereby insulating the first side wall and the electrode terminal.

[0053] In some embodiments, the thickness of the second insulating sub-portion covering the fifth surface is T6, and the radial size of the connecting portion is D1, where 0.0003≤T6 / (D1+2T6)≤0.05.

[0054] By adopting the technical scheme of this embodiment, in the case of a certain (D1+2T6), the design of T6 / (D1+2T6)≥0.0003 enables the second insulating sub-portion to insulate the fifth surface and the first side wall when the first insulating member softens and melts, thereby achieving insulation between the electrode terminal and the first side wall. In addition, the design of T6 / (D1+2T6)≤0.05 can reduce the space occupation of the second insulating sub-portion, increase the radial size of the connecting portion, improve the overcurrent capacity of the connecting portion, and improve the fast-charging performance of the battery monomer. Therefore, the insulation between the electrode terminal and the first side wall and the fast-charging performance of the battery monomer can be well balanced.

[0055] In some embodiments, at least part of the sixth surface is covered with the second insulating sub-portion.

[0056] By adopting the technical scheme of this embodiment, when the first insulating member softens or melts, the second insulating sub-portion covering the sixth surface can be located between the sixth surface and the first side wall, thereby insulating the first side wall and the electrode terminal.

[0057] In some embodiments, the thickness of the second insulating sub-portion covering the sixth surface is T7, and the size of the second limiting protrusion is T8 along the axial direction of the first through hole, where 0.005≤T7 / T8≤0.2.

[0058] By adopting the technical scheme of this embodiment, in the case of T8, the design of T7 / T8≥0.005 enables the second insulator part to insulate and separate the sixth surface and the first side wall when the first insulating part softens and melts, thereby realizing the insulation of the electrode terminal and the first side wall; in addition, the design of T7 / T8≤0.2 can reduce the space occupation of the second insulator part and reduce material waste. Therefore, the insulation of the electrode terminal and the first side wall and the compactness of the battery monomer can be better balanced.

[0059] In some embodiments, the second insulating part includes a first insulator part, the first surface includes a plurality of first covering surfaces, the plurality of first covering surfaces include a first surface, a second surface and a third surface, the first surface is arranged away from the electrode assembly along the axial direction of the first through hole, the third surface is arranged toward the electrode assembly along the axial direction of the first through hole, the second surface is connected between the first surface and the second surface and surrounds the first through hole; at least part of the first surface is covered by the first insulator part, the first insulator part covering the first surface protrudes away from the side surface of the first limiting protrusion away from the fifth surface along the direction in which the fifth surface points to the second surface; and / or, at least part of the third surface is covered by the first insulator part, the first insulator part covering the third surface protrudes away from the side surface of the second limiting protrusion away from the fifth surface along the direction in which the fifth surface points to the second surface.

[0060] By adopting the technical scheme of this embodiment, when the first insulating part softens or melts, the first insulator part can better insulate and separate the electrode terminal and the first side wall, which is conducive to improving the insulation reliability of the electrode terminal and the first side wall.

[0061] In some embodiments, the first insulating part includes a first insulating region part, a second insulating region part and a third insulating region part connected together, at least part of the first insulating region part is located between the first surface and the fourth surface, the second insulating region part is located between the second surface and the fifth surface, and at least part of the third insulating region part is located between the third surface and the sixth surface.

[0062] By adopting the technical scheme of this embodiment, the fourth surface of the electrode terminal and the first surface of the first side wall are insulated and separated by the first insulating region part, the fifth surface of the electrode terminal and the second surface of the first side wall are insulated and separated by the second insulating region part, and the sixth surface of the electrode terminal and the third surface of the first side wall are insulated and separated by the third insulating region part, which can realize the three-surface insulation of the electrode terminal and the first side wall, is conducive to improving the insulation effect of the electrode terminal and the first side wall, and improves the use reliability of the battery monomer.

[0063] In some embodiments, at least part of the first surface is covered by the first insulating subpart, and the first insulating subpart protrudes away from the side surface of the fifth surface in the direction of the second surface along the fifth surface; and / or, at least part of the third surface is covered by the first insulating subpart, and the first insulating subpart protrudes away from the side surface of the fifth surface in the direction of the second surface along the fifth surface.

[0064] By adopting the technical solutions of the embodiments, when the first insulating part softens or melts, the first insulating subpart can better insulate and separate the electrode terminal and the first side wall, which is conducive to improving the insulation reliability of the electrode terminal and the first side wall.

[0065] In some embodiments, the second insulating part includes a third insulating part, and at least part of the side surface of the fifth surface away from the first limiting protrusion is covered by the third insulating part along the radial direction of the first through hole; and / or, the second insulating part includes a fourth insulating part, and at least part of the side surface of the fifth surface away from the second limiting protrusion is covered by the fourth insulating part along the radial direction of the first through hole.

[0066] By adopting the technical solutions of the embodiments, when the first insulating part softens or melts, the second insulating part can better insulate and separate the electrode terminal and the first side wall, which is conducive to improving the insulation reliability of the electrode terminal and the first side wall.

[0067] In some embodiments, the second insulating part includes a fifth insulating part, the electrode terminal has a second end surface, the second end surface is arranged towards the electrode assembly along the axial direction of the first through hole, the second end surface includes a third part and a fourth part, the electrode assembly is connected to the third part, the fourth part is not electrically connected to the electrode assembly, and the fourth part is covered by the fifth insulating part.

[0068] By adopting the technical solutions of the embodiments, the third part is not covered by the fifth insulating part, which can reduce the influence 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 risk of short circuit of the battery monomer, and is conducive to improving the use reliability of the battery monomer.

[0069] In some embodiments, the thickness of the fifth insulating part is T9, where 0 < T9 ≤ 30 μm, and optionally, 0 < T9 ≤ 15 μm.

[0070] By adopting the technical scheme of the embodiment, the second end face can be covered with the fifth insulation part, the insulation area of the electrode terminal can be increased, the insulation performance of the electrode terminal is improved, the use reliability of the battery monomer is improved, the space occupation of the fifth insulation part is reduced, the material waste and the manufacturing difficulty of the fifth insulation part are reduced, the thickness of the fifth insulation part is thin and the fifth insulation part is easy to be damaged, and thus the electrode terminal and the tab of the electrode assembly are conveniently welded. Therefore, the insulation performance of the electrode terminal, the structural compactness of the battery monomer and the electrical connection between the electrode assembly and the electrode terminal can be well balanced.

[0071] In some embodiments, the electrode terminal is an aluminum terminal, and the outer surface of the electrode terminal is subjected to an oxidation process or a nitriding process to obtain the second insulation part.

[0072] By adopting the technical scheme of the embodiment, the electrode terminal is made of aluminum, and the second insulation part is obtained by subjecting the surface of the electrode terminal to an oxidation process or a nitriding process. The processing and manufacturing method is simple, and the manufacturing cost of the electrode terminal is reduced.

[0073] In some embodiments, the second insulation part includes at least one of an aluminum oxide part, a zirconium oxide part, a magnesium silicate part, an aluminum nitride part, a boron nitride part, a silicon carbide part, and a thermosetting polyimide part.

[0074] By adopting the technical scheme of the embodiment, the second insulation part adopts the above structure, and can insulate and separate the first side wall and the electrode terminal when the first insulation part softens or melts, thereby improving the use reliability of the battery monomer.

[0075] In some embodiments, the shell includes an end cover and a shell body, the shell body surrounds to form a receiving cavity, the end cover covers the opening of the receiving cavity, and the side wall of the shell body and the end cover oppositely arranged forms the first side wall.

[0076] By adopting the technical scheme of the embodiment, the electrode terminal is arranged on the shell body, the overall structural stability of the battery monomer is increased, and the use reliability of the battery monomer is improved.

[0077] In some embodiments, the electrode assembly includes a body and first and second tabs with different polarities, the body leads out the first tab towards the end of the end cover, the body leads out the second tab towards the end of the first side wall, the first tab is electrically connected to the end cover, and the second tab is electrically connected to the electrode terminal.

[0078] By adopting the technical scheme of the embodiment, the first tab is electrically connected with the end cover, so that the end cover or the shell can serve as one output pole of the battery monomer, the second tab is electrically connected with the electrode terminal, so that the electrode terminal serves as another output pole of the battery monomer, the first insulating piece and the second insulating piece can insulate the electrode terminal and the shell in double layers, so that the insulation reliability of the electrode terminal and the shell can be better improved, the risk of short circuit of the battery monomer can be better reduced, and the use reliability of the battery monomer can be improved; in addition, the end cover and the shell serve as the output poles of the battery monomer, the mutual electrical connection between the battery monomers can be facilitated, and the structure of the battery monomer can be simplified, and the processing and manufacturing are facilitated.

[0079] In some embodiments, the battery monomer is a cylindrical battery monomer or a prismatic battery monomer.

[0080] The technical scheme of the embodiment of the application can be applied to cylindrical battery monomers and prismatic battery monomers, and has a wide application range.

[0081] In a second aspect, a battery device is provided, which includes a plurality of the above battery monomers.

[0082] The battery device of the embodiment of the application adopts the above battery monomer, and the use reliability of the battery monomer is good, which is beneficial to improve the use reliability of the battery device.

[0083] In a third aspect, a power consumption device is provided, which includes the above battery monomer or the above battery device, and the battery monomer or the battery device is used for storing or providing electric energy.

[0084] The power consumption device of the embodiment of the application adopts the above battery monomer or the above battery device, and the use reliability of the battery monomer and the battery device is good, which is beneficial to improve the use reliability of the power consumption device.

[0085] The above description is only a summary of the technical scheme of the application, in order to more clearly understand the technical means of the application, the specific embodiments of the application can be implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the application more obvious and easy to understand, the following will specifically describe the embodiments of the application. BRIEF DESCRIPTION OF DRAWINGS

[0086] In order to more clearly illustrate the technical scheme in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the application, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor.

[0087] Figure 1 The structural schematic diagram of the battery monomer provided by some embodiments of the application is shown.

[0088] Figure 2 A cross-sectional view of a battery cell is provided for some embodiments of the present application.

[0089] Figure 3 A cross-sectional view of a battery cell is provided for some embodiments of the present application. Figure 2 A partial enlarged view at A in FIG.

[0090] Figure 4 A cross-sectional view of a battery cell is provided for some embodiments of the present application. Figure 3 A partial enlarged view at B in FIG.

[0091] Figure 5 An exploded view of a battery device is provided for some embodiments of the present application.

[0092] Figure 6 A structural view of a vehicle is provided for some embodiments of the present application.

[0093] In the drawings:

[0094] 100, battery cell; 10, shell; 101, first side wall; 1011, first through hole; 1012, first surface; 10121, first covering surface; 10122, first surface; 10123, second surface; 10124, third surface; 102, accommodation cavity; 11, end cover; 12, shell body; 20, electrode assembly; 21, body; 22, first tab; 23, second tab; 30, electrode terminal; 301, second surface; 3011, second covering surface; 3012, fourth surface; 3013, fifth surface; 3014, sixth surface; 302, first end surface; 3021, first part; 3022, second part; 303, second end surface; 3031, third part; 3032, fourth part; 31, end body; 311, first limiting part; 3111, first limiting protrusion; 312, second limiting part; 3121, second limiting protrusion; 313, connecting part; 3101, recessed part; 3102, flat part; 3103, recessed space; 3104, liquid injection hole; 32, cap body; 40, first insulating piece; 41, first insulating region; 42, second insulating region; 43, third insulating region; 50, second insulating piece; 51, first insulating sub-region; 52, first insulating region; 521, second insulating sub-region; 53, second insulating region; 54, third insulating region; 55, fourth insulating region; 56, fifth insulating region; 61, first conductive piece; 62, second conductive piece; 200, box body; 210, first box body; 220, second box body; 1000, vehicle; 1100, battery device; 1200, controller; 1300, motor. DETAILED DESCRIPTION

[0095] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0096] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application and the above description of drawings are used to distinguish different objects, not to describe a particular order or primary and secondary relationship.

[0097] In the present application, the phrase "embodiments" means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily all refer to the same embodiments, nor are they necessarily mutually exclusive or alternative embodiments to each other.

[0098] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mount", "connect", "connection", "attach" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0099] In the present application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects.

[0100] In the embodiments of the present application, the same reference signs represent the same parts, and for the sake of brevity, detailed description of the same parts is omitted in different embodiments. It should be understood that the thickness, length and width of various components in the embodiments of the present application shown in the drawings, and the overall thickness, length and width of the integrated device are only exemplary and should not constitute any limitation on the present application.

[0101] "plurality" appearing in the present application means two or more (including two).

[0102] The battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging to continue to be used.

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

[0104] The battery cell generally includes an electrode assembly and a case for accommodating the electrode assembly. The electrode assembly generally includes a positive electrode sheet, a negative electrode sheet, and a separator that separates the positive electrode sheet and the negative electrode sheet.

[0105] The case is provided with an electrode terminal, 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 an external circuit to realize the output or input of the electric energy of the battery cell; the electrode terminal and the case are generally insulated and separated by a first insulating member (for example, a plastic member, etc.), and in the case of overheating of the electrode terminal or thermal runaway of the battery cell, the first insulating member is prone to softening or melting, causing the electrode terminal to be lapped with the case, resulting in short circuit of the battery cell, which seriously affects the use reliability of the battery cell.

[0106] In view of this, the embodiments of the present application provide a technical scheme, wherein a second insulating member is provided between at least part of the first insulating member and the case or between at least part 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, so that in the case of melting or melting of the first insulating member, the second insulating member has a stable structure form, the second insulating member insulates and separates the electrode terminal and the case, reduces the risk of lapping of the electrode terminal with the case, improves the insulation reliability of the electrode terminal and the case in the case of overheating or thermal runaway, reduces the short circuit risk of the battery cell, and improves the use reliability of the battery cell.

[0107] Referring to Figure 1 and Figure 2 , the embodiments of the present application provide a battery cell 100, which includes a case 10 and an electrode assembly 20, at least part of the electrode assembly 20 is accommodated in the case 10.

[0108] The case 10 can be a hollow structure, and an accommodation space for accommodating the electrode assembly 20 and the electrolyte is formed inside. Exemplarily, the case 10 of the battery cell 100 is a cylindrical case.

[0109] In some embodiments, the housing 10 can be a metal housing, for example, the housing 10 can be a steel housing, an aluminum housing, a composite metal housing (e.g., a copper-aluminum composite housing), or other metal housing. Alternatively, the housing 10 can also be a non-metal housing, for example, a plastic housing (e.g., a polypropylene housing), or the like.

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

[0111] The housing body 12 and the end cap 11 can be independent components. For example, the housing body 12 can be provided with an opening, and the end cap 11 can be coupled to the housing body 12 by covering the opening to form the internal cavity of the battery cell 100.

[0112] The material of the housing body 12 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, or the like.

[0113] The shape of the end cap 11 can be adapted to the shape of the housing body 12 to cooperate with the housing body 12. The material of the end cap 11 can be the same as or different from the material of the housing body 12. Alternatively, the end cap 11 can be made of a material (e.g., copper, iron, aluminum, stainless steel, aluminum alloy, plastic, or the like) having certain hardness and strength, so that the end cap 11 is not easily deformed when subjected to extrusion and collision, and the battery cell 100 can have higher structural strength and improved reliability.

[0114] The end cap 11 can be coupled to the housing body 12 by welding, bonding, clamping, or other means.

[0115] The housing body 12 can be open at one end or both ends. In some examples, the housing body 12 can be a structure open at one side, and the end cap 11 is provided as one and covers the housing body 12. In other examples, the housing body 12 can also be a structure open at both sides, and the end cap 11 is provided as two and covers the two openings of the housing body 12, respectively.

[0116] The electrode assembly 20 is a component in which electrochemical reactions occur in the battery cell 100. The electrode assembly 20 can be wholly accommodated in the housing 10 or partially accommodated in the housing 10. For example, a portion of the tab of the electrode assembly 20 can extend to the outside of the housing 10.

[0117] Alternatively, the electrode assembly 20 is wholly accommodated in the housing 10.

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

[0119] In some embodiments, the positive electrode tab can include a positive electrode current collector and a positive electrode active material layer disposed on at least one surface of the positive electrode current collector, a portion of the positive electrode current collector covered with the positive electrode active material layer and the positive electrode active material layer forming a positive electrode main portion, and a portion of the positive electrode current collector not covered with the positive electrode active material layer forming a positive electrode tab.

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

[0121] As an example, the positive electrode current collector can employ a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as the metal foil, a pure metal, an alloy, a surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, a nickel alloy, titanium, or silver, etc. can be employed. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, an aluminum alloy, nickel, a nickel alloy, titanium, a titanium alloy, silver, and a silver alloy, etc.) on a polymer material base material (e.g., a base material 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 can include at least one of a lithium-containing phosphate, a lithium transition metal oxide, and a modified compound of each thereof. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery positive electrode active material can also be used. These positive electrode active materials can be used alone only one or two or more can be used in combination. Examples of the lithium-containing phosphate can include, but are not limited to, at least one of lithium iron phosphate (e.g., LiFeP04(also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (e.g., LiMnP04), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite material of lithium manganese iron phosphate and carbon. Examples of the lithium transition metal oxide can include, but are not limited to, at least one of lithium cobalt oxide (e.g., LiCo02), lithium nickel oxide (e.g., LiNi02), lithium manganese oxide (e.g., LiMn02, LiMn204), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (e.g., LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2(also referred to as NCM 333 ), LiNi 0.5 Co 0.2 Mn0.3 O2(also can be referred to as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2(also can be referred to as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2(also can be referred to as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2(also can be referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.8 Co 0.15 Al 0.05 O2), and modified compounds thereof. The modified compounds refer to substances obtained by modification means such as doping or coating on the basis of the above-mentioned substances.

[0123] In some embodiments, the negative electrode sheet can 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, a portion of the negative electrode current collector covered with the negative electrode active material layer and the negative electrode active material layer forming a negative electrode main body portion, and a portion of the negative electrode current collector not covered with the negative electrode active material layer forming a negative electrode tab.

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

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

[0126] As an example, the negative active material can employ a negative active material for the battery cell 100 known in the art. As an example, the negative active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based material, tin-based material, and lithium titanate, etc. The silicon-based material can be selected from at least one of elemental silicon, silicon oxide compound, silicon-carbon composite, silicon-nitrogen composite, and silicon alloy. The tin-based material can be selected from at least one of elemental tin, tin oxide compound, and tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as a negative active material for the battery cell 100 can also be used. These negative active materials can be used alone only or in combination of two or more.

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

[0128] In some embodiments, the electrode assembly 20 further includes a separator disposed between the positive electrode sheet and the negative electrode sheet. The separator can function to prevent short circuiting between the positive and negative electrodes while allowing the active ions to pass therethrough.

[0129] In some embodiments, the separator is a separator film. The separator film of the present application can employ any known porous structure separator film having good chemical stability and mechanical stability.

[0130] As an example, the main material of the separator film can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride, and ceramic. The separator film can be a single layer film or a multi-layer composite film, and is not particularly limited. In the case of a multi-layer composite film, the materials of the respective layers can be the same or different. The separator can be a separate member located between the positive electrode sheet and the negative electrode sheet, or can be attached to the surface of the positive electrode sheet or the surface of the negative electrode sheet. An inorganic particle coating layer, an organic particle coating layer, or an organic / inorganic composite coating layer can be applied to the surface of the separator film.

[0131] In some embodiments, the battery cell 100 further includes an electrolyte that functions to conduct ions between the positive electrode sheet and the negative electrode sheet. The electrolyte of the present application can be selected as needed. The electrolyte can be in a liquid state, a gel state, or a solid state.

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

[0133] In some embodiments, the electrolyte salt can be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonylimide, lithium bistrifluoromethylsulfonylimide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorobisoxalate borate, lithium bisoxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorodioxalate phosphate.

[0134] In some embodiments, the solvent can 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, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, butyl sulfone, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent can also be selected from an ether solvent. The ether solvent can 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 a crown ether.

[0135] In some embodiments, the electrolyte solution can also include an additive. For example, the additive can include a negative electrode film-forming additive, a positive electrode film-forming additive, and an additive capable of improving certain properties of the cylindrical battery cell 100, such as an additive capable of improving overcharge / rapid charge properties of the battery cell 100, an additive capable of improving high-temperature properties of the battery cell 100, an additive capable of improving low-temperature properties of the battery cell 100, and the like.

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

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

[0138] As an example, the polymer of the polymer solid-state electrolyte can include a polyether (polyethylene oxide), a polysiloxane, a polycarbonate, a polyacrylonitrile, a polyvinylidene fluoride, a polymethyl methacrylate, a single-ion polymer, a polyionic liquid, cellulose, or the like.

[0139] As an example, the inorganic solid-state electrolyte can be one or more of an oxide solid-state electrolyte (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON thin film), a sulfide solid-state electrolyte (crystalline lithium superionic conductor (lithium germanium phosphorous sulfide, argyrodite), amorphous sulfide), and a halide solid-state electrolyte, a nitride solid-state electrolyte, and a hydride solid-state electrolyte.

[0140] As an example, the composite solid-state electrolyte is formed by adding an inorganic solid-state electrolyte filler to a polymer solid-state electrolyte.

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

[0142] The electrode assembly 20 is a wound structure. As an example, the positive electrode sheet, the separator, and the negative electrode sheet are wound into a cylindrical wound structure.

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

[0144] Please refer to Figure 3 and Figure 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 side wall 101 and a receiving cavity 102. The first side wall 101 has a first through hole 1011 that communicates with the receiving cavity 102. At least part of the electrode assembly 20 is disposed in 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 side wall 101 to insulate and separate the electrode terminal 30 and the first side wall 101. The second insulating member 50 is disposed between at least part of the first insulating member 40 and the electrode terminal 30, and / or between at least part of the first insulating member 40 and the first side wall 101. The second insulating member 50 has a heat resistance greater than that of the first insulating member 40.

[0145] The housing 10 can refer to a component with an internal cavity. The internal space of the housing 10 forms a receiving cavity. The housing 10 is formed by a plurality of side walls. One of the plurality of side walls forms the first side wall 101.

[0146] For example, the end cap 11 and the shell 12 jointly form the receiving cavity.

[0147] For example, the first side wall 101 can refer to the end cap 11.

[0148] For example, the first side wall 101 can also refer to a side wall of the shell 12. For example, the first side wall 101 can refer to a side wall of the shell 12 adjacent to the end cap 11, or a side wall of the shell 12 opposite to the end cap 11.

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

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

[0151] For example, the number of electrode terminals 30 is one. Two tabs (i.e., a positive tab and a negative tab) of the electrode assembly 20 are respectively electrically connected to the electrode terminal 30 and the housing 10.

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

[0153] For example, the number of the electrode terminals 30 is two, and the two electrode terminals 30 can be arranged on the same side wall of the shell 10 or on different side walls of the shell 10.

[0154] For example, the two electrode terminals 30 are arranged at intervals on the end cover 11.

[0155] The first through hole 1011 can refer to a through hole penetrating the first side wall 101, and the first through hole 1011 connects the outside of the shell 10 and the accommodation cavity.

[0156] For example, the electrode terminal 30 can directly electrically connect with the tab of the electrode assembly 20 through the first through hole 1011. For example, the electrode terminal 30 is directly welded with the tab of the electrode assembly 20.

[0157] For example, the electrode terminal 30 can also electrically connect with the tab of the electrode assembly 20 through the first conductive member 61 (for example, a jumper, a current collector plate, etc.).

[0158] For example, the first conductive member 61 is located in the accommodation cavity, a part of the electrode terminal 30 is located in the first through hole 1011 and electrically connected with the first conductive member 61, and the other part of the electrode terminal 30 is located outside the shell 10 to electrically connect with the external circuit; or the entire electrode terminal 30 is located in the first through hole 1011; or the entire electrode terminal 30 is located outside the shell 10. The electrode terminal 30 and the first conductive member 61 can be electrically connected by welding, riveting, etc.

[0159] For example, the shell 10 can directly electrically connect with the tab of the electrode assembly 20. For example, the shell 10 is directly welded with the tab of the electrode assembly 20.

[0160] For example, the shell 10 can also electrically connect with the tab of the electrode assembly 20 through the second conductive member 62 (for example, a jumper, a current collector plate, etc.). For example, the shell 10 and the second conductive member 62 can be electrically connected by welding, riveting, etc.

[0161] The first insulating member 40 can refer to a component capable of insulating and separating the first side wall 101 and the electrode terminal 30. The first insulating member 40 can be partially located between the first side wall 101 and the electrode terminal 30, or completely located between the first side wall 101 and the electrode terminal 30. The first insulating member 40 is made of insulating material, and the insulating material can be plastic, etc.

[0162] As an example, the first insulation member 40 is annularly arranged outside the electrode terminal 30, and the first insulation member 40 is arranged in the first through hole 1011 to insulate and separate the first side wall 101 and the electrode terminal 30.

[0163] The second insulation member 50 can be a component made of an insulating material, which can be plastic, ceramic, etc.

[0164] The second insulation member 50 is arranged between at least part of the first insulation member 40 and the electrode terminal 30. As an example, the second insulation member 50 can be arranged between the first insulation member 40 and the electrode terminal 30, the first insulation member 40 is arranged between the second insulation member 50 and the first side wall 101, or the second insulation member 50 is embedded in the first insulation member 40, part of the first insulation member 40 is arranged between the second insulation member 50 and the electrode terminal 30, and another part of the second insulation member 50 is arranged between the second insulation member 50 and the first side wall 101.

[0165] The second insulation member 50 is arranged between at least part of the first insulation member 40 and the first side wall 101. As an example, the second insulation member 50 can be arranged between the first insulation member 40 and the first side wall 101, the first insulation member 40 is arranged between the second insulation member 50 and the electrode terminal 30, or the second insulation member 50 is embedded in the first insulation member 40, part of the first insulation member 40 is arranged between the second insulation member 50 and the electrode terminal 30, and another part of the second insulation member 50 is arranged between the second insulation member 50 and the first side wall 101.

[0166] The heat resistance of the first insulation member 40 is greater than that of the second insulation member 50. It can be understood that when the first insulation member 40 softens or melts, the second insulation member 50 does not soften or melt, or the degree of softening or melting of the second insulation member 50 is lower than that of the first insulation member 40. At this time, the second insulation member 50 can maintain a stable structure, so that the second insulation member 50 can insulate and separate the first side wall 101 and the electrode terminal 30.

[0167] By adopting the technical scheme of the embodiment, the electrode assembly 20 is loaded into the shell 10, the shell 10 includes a first side wall 101 provided with a first through hole 1011, the electrode assembly 20 is electrically connected with the electrode assembly 20 through the first through hole 1011, the first insulating piece 40 is arranged between the electrode terminal 30 and the first side wall 101, and the second insulating piece 50 is arranged between at least part of the first insulating piece 40 and the electrode terminal 30 and / or between at least part of the first insulating piece 40 and the first side wall 101, so that the first insulating piece 40 and the second insulating piece 50 can insulate and separate the electrode terminal 30 and the first side wall 101, to realize stable input or output of electric energy of the battery monomer 100. Since the heat resistance of the second insulating piece 50 is greater than that of the first insulating piece 40, in the case that the first insulating piece 40 softens or melts when the electrode terminal 30 overheats or the battery monomer 100 has thermal runaway, the second insulating piece 50 can have a stable structure form, the second insulating piece 50 insulates and separates the first side wall 101 and the electrode terminal 30, reduces the risk of short circuit of the first side wall 101 and the electrode terminal 30, and improves the use reliability of the battery monomer 100; in addition, the first insulating piece 40 and the second insulating piece 50 are arranged between the first side wall 101 and the electrode terminal 30, which can realize two-layer insulation between the electrode terminal 30 and the first side wall 101, improve the insulation reliability between the electrode terminal 30 and the first side wall 101, and improve the use reliability of the battery monomer 100.

[0168] In some embodiments, the first insulating piece 40 and the second insulating piece 50 are made of insulating materials, and the heat resistance of the insulating materials can be characterized by the melting point, but some insulating materials (for example, thermosetting insulating materials) do not have a fixed melting point, and the heat resistance thereof can be characterized by the thermal weight loss temperature.

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

[0170] For example, the melting point of the insulating material can be obtained by consulting known books such as textbooks, and the melting point of the insulating part can be measured by referring to the method recorded in “GB / T 11026 Electrical Insulating Materials Heat Resistance”. The melting point of some insulating coatings can be measured by referring to the method recorded in “GB / T 42259 Thermal Barrier Coating of Metals and Other Inorganic Covering Layers Heat Resistance Cycle and Thermal Shock Performance Test Method”. Of course, it can also be measured by referring to the method recorded in “GB / T 19466 Differential Scanning Calorimetry (DSC)”.

[0171] The thermal weight loss temperature is the temperature at which the material starts to lose mass during heating. In the embodiments of the present application, the thermal weight loss temperature can refer to the temperature at which the mass loss of the material is 5%, i.e., the temperature at which the mass of the material is reduced by 5% relative to the initial mass in the thermal weight loss analysis. The thermal weight loss temperature of the material can be measured according to the method described in GB / T 27761-2011 Thermal Gravimetric Analyzer Test Method for Weight Loss and Residual Quantity.

[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 solutions of the embodiments, 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 side wall 101, reducing the risk of short circuit of the battery monomer 100, and improving the use reliability of the battery monomer 100.

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

[0175] By adopting the technical solutions of the embodiments, 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 side wall 101, reducing the risk of short circuit of the battery monomer 100, and improving the use reliability of the battery monomer 100.

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

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

[0178] For example, the melting point of the second insulating member 50 can 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 weight loss temperature of the second insulating member 50 can be 300°C, 350°C, 400°C, 500°C, 600°C, 700°C, 800°C, 900°C, 100°C, etc.

[0180] In some battery monomer 100, the first insulation 40 will soften or melt at 100℃ or 200℃, while the melting point or thermal weightlessness temperature of the second insulation 50 is greater than or equal to 300℃, so that the second insulation 50 has a stable structure form in the softening or melting state of the first insulation 40, thereby insulating and separating the first side wall 101 and the electrode terminal 30.

[0181] In some embodiments, the melting point or thermal weightlessness temperature of the second insulation 50 is greater than or equal to 500℃.

[0182] By adopting the technical scheme of the embodiment, the second insulation 50 has a more stable structure form in the softening or melting state of the first insulation 40, thereby more stably insulating and separating the first side wall 101 and the electrode terminal 30.

[0183] In some embodiments, the melting point or thermal weightlessness temperature of the second insulation 50 is greater than or equal to 700℃.

[0184] In some battery monomer 100, the electrode terminal 30 is made of aluminum, and the melting point of aluminum is less than 700℃, while the melting point or thermal weightlessness temperature of the second insulation 50 is greater than the melting point of the electrode terminal 30. In the case of melting of the electrode terminal 30, the second insulation 50 still has good structural stability, thereby separating the electrode terminal 30 and the first side wall 101, which is conducive to improving the use reliability of the battery monomer 100.

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

[0186] The resistivity refers to a physical quantity describing the degree of hindering current flow of a material. It is a scalar quantity used to measure the hindering ability of a material to current flow per unit length and unit cross-sectional area. The resistivity can be measured by referring to the method recorded in GB / T 10581-2006.

[0187] The resistivity of the second insulation 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 scheme of the embodiment, the second insulating part 50 has good insulation performance, and when the first insulating part 40 softens or melts, the second insulating part 50 can stably insulate and separate the first side wall 101 and the electrode terminal 30, reduce the risk of short circuit of the battery monomer 100, and help to improve the use reliability of the battery monomer 100.

[0189] In some embodiments, the first side wall 101 includes a first surface 1012, an outer surface of the electrode terminal 30 includes a second surface 301, the first surface 1012 and the second surface 301 are oppositely arranged, and the first insulating part 40 and the second insulating part 50 are located between the first surface 1012 and the second surface 301.

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

[0191] As an example, the electrode terminal 30 is inserted into the first through hole 1011, the electrode terminal 30 is in a columnar structure, an outer peripheral wall surface of the electrode terminal 30 is the second surface 301, and an inner wall surface of the first through hole 1011 is the first surface 1012; a groove is formed on an outer peripheral surface of the electrode terminal 30, a portion of the first side wall 101 close to the first through hole 1011 is clamped in the groove, a groove wall of the groove is the second surface 301, and two surfaces of the first side wall 101 opposite to each other along an axial direction of the first through hole 1011 and a hole wall surface of the first through hole 1011 together form the first surface 1012. The axial direction of the first through hole 1011 can refer to an axial direction of the electrode assembly 20 or a height direction of the battery monomer 100, and specific reference can be made to Figures 1-4 Z direction in the description.

[0192] As an example, the electrode terminal 30 is located outside the shell 10, a surface of the electrode terminal 30 facing the first side wall 101 is the second surface 301, and a surface of the first side wall 101 facing the electrode terminal 30 is the first surface 1012.

[0193] The first insulating part 40 can be partially located between the first surface 1012 and the second surface 301, or the entire first insulating part 40 is located between the first surface 1012 and the second surface 301, thereby insulating and separating the surfaces of the electrode terminal 30 and the first side wall 101 opposite to each other, so as to insulate the electrode terminal 30 and the first side wall 101.

[0194] The second insulating member 50 can be partially located between the first surface 1012 and the second surface 301, or the entire second insulating member 50 can be located between the first surface 1012 and the second surface 301, thereby insulating the electrode terminal 30 and the first sidewall 101 from each other.

[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 the first surface 1012 and the second surface 301 of the electrode terminal 30 and the first sidewall 101 from each other, thereby insulating the electrode terminal 30 and the first sidewall 101.

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

[0197] The second insulating member 50 can cover part of the first surface 1012. For example, the first insulating member 40 covers the surface of the part of the first sidewall 101 close to the first through hole 1011. The second insulating member 50 can also cover the entire first surface 1012.

[0198] For example, the second insulating member 50 can be an insulating coating covering the first surface 1012, or an insulating component wrapped on the first surface 1012. The insulating component can be connected to the first surface 1012 or not.

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

[0200] In some embodiments, the second insulating member 50 includes a first insulating sub-member 51, and the first surface 1012 includes a plurality of first covering surfaces 10121, at least part of at least one first covering surface 10121 being covered by the first insulating sub-member 51.

[0201] The first surface 1012 can be composed of a plurality of first covering surfaces 10121. The first covering surfaces 10121 can be flat surfaces, curved surfaces, or other shapes.

[0202] The second insulating member 50 includes one or more first insulating sub-members 51. When the number of the first insulating sub-members 51 is one, the first insulating sub-member 51 covers one first covering surface 10121, thereby insulating the electrode terminal 30 and the first sidewall 101 from each other.

[0203] As an example, among the plurality of first cover surfaces 10121, one of the first cover surfaces 10121 is covered with the first insulator portion 51 to insulate the first side wall 101 and the electrode terminal 30. The first insulator portion 51 can cover a portion of the first cover surface 10121, or can cover the entire first cover surface 10121.

[0204] As an example, among the plurality of first cover surfaces 10121, one of the first cover surfaces 10121 is covered with the first insulator portion 51 to insulate the first side wall 101 and the electrode terminal 30. The first insulator portion 51 can cover a portion of the first cover surface 10121, or can cover the entire first cover surface 10121.

[0205] By adopting the technical solutions of this embodiment, when the first insulating member 40 softens and melts, the first insulator portion 51 covers the first cover surface 10121, and the first insulator portion 51 is located between the electrode terminal 30 and the first side wall 101, thereby insulating the first side wall 101 and the electrode terminal 30.

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

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

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

[0209] The design of T1≥5 μm enables the first insulator portion 51 to insulate the first side wall 101 and the electrode terminal 30 when the first insulating member 40 softens and melts. In addition, the design of T1≤100 μm reduces the space occupation of the first insulator portion 51, reduces material waste, and reduces the difficulty of manufacturing the first insulator portion. Therefore, the insulation of the electrode terminal 30 and the first side wall 101 and the structural compactness of the battery monomer 100 can be better balanced.

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

[0211] In some embodiments, 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 arranged away from the electrode assembly 20, the third surface 10124 is arranged toward 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 the first through hole 1011; at least one of at least part of the first surface 10122, at least part of the second surface 10123, and at least part of the third surface 10124 is covered with the first insulating sub-portion 51.

[0212] For example, the first side wall 101 has a plate structure, the number of the first covering surfaces 10121 is three, and the three first covering surfaces 10121 are the first surface 10122, the second surface 10123, and the third surface 10124, respectively; wherein 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 surfaces of the first side wall 101 oppositely distributed are divided into the first surface 10122 and the third surface 10124, the first surface 10122 is arranged away from the electrode assembly 20, i.e., the outer surface of the first side wall 101, and the third surface 10124 is arranged toward the electrode assembly 20, i.e., the inner surface of the first side wall 101.

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

[0214] For example, at least part of the first surface 10122 is covered with the first insulating sub-portion 51, part of the first surface 10122 is covered with the first insulating sub-portion 51, and the entire first surface 10122 is covered with the first insulating sub-portion 51.

[0215] For example, at least part of the second surface 10123 is covered with the first insulating sub-portion 51, part of the second surface 10123 is covered with the first insulating sub-portion 51, and the entire second surface 10123 is covered with the first insulating sub-portion 51.

[0216] For example, at least part of the third surface 10124 is covered with the first insulating sub-portion 51, part of the third surface 10124 is covered with the first insulating sub-portion 51, and the entire third surface 10124 is covered with the first insulating sub-portion 51.

[0217] For example, any two of the first surface 10122, the second surface 10123, and the third surface 10124 are covered with the first insulating sub-portion 51, or all of the first surface 10122, the second surface 10123, and the third surface 10124 are covered with the first insulating sub-portion 51.

[0218] By adopting the technical scheme of the embodiment, when the first insulating member 40 appears softened and melted, the first insulating sub 51 is located between the electrode terminal 30 and the first side wall 101, and the first side wall 101 and the electrode terminal 30 are insulated.

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

[0220] The first insulating part 52 can refer to the part of the second insulating member 50 covering the second surface 301, the first insulating part 52 covering part of the second surface 301, or the entire second surface 301 being covered with the first insulating part 52.

[0221] For 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 sleeved with an insulating part, which is the second insulating member 50.

[0222] By adopting the technical scheme of the embodiment, when the first insulating member 40 appears softened and melted, the first insulating part 52 is located between the second surface 301 and the first side wall 101, and the first side wall 101 and the electrode terminal 30 are insulated; in addition, the electrode terminal 30 has a simple structure, and the process of providing the second insulating member 50 on the outer surface of the electrode terminal 30 is simple, facilitating processing and manufacturing.

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

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

[0225] The design of S2 / S1≥0.3 makes the electrode terminal 30 covered with the second insulating member 50, so that when the first insulating member 40 appears softened or melted, the electrode terminal 30 and the first side wall 101 can be insulated; the design of S2 / S1≤0.85 makes the electrode terminal 30 flow out part of the area for electrical connection with the busbar part and the electrode assembly 20, improves the connection reliability between the electrode terminal 30, the busbar part and the electrode assembly 20, and improves the performance of the battery monomer 100; therefore, the insulation of the electrode terminal 30 and the first side wall 101 and the connection reliability between the electrode terminal 30, the busbar part and the electrode assembly 20 can be considered at the same time.

[0226] In some embodiments, 0.45≤S2 / S1≤0.75, which can better balance the insulation of the electrode terminal 30 and the first side wall 101 and the connection reliability between the electrode terminal 30, the busbar component, and the electrode assembly 20.

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

[0228] In the axial direction of the first through hole 1011, the surface of the electrode terminal 30 away from the electrode assembly 20 is the first end surface 302, part of the first end surface 302 is covered with the second insulating portion 53, or the entire first end surface 302 is covered with the second insulating portion 53. The shape of the first end surface 302 can be various, such as a flat surface, a stepped surface, etc.

[0229] For example, in the case where the entire first end surface 302 is covered with the second insulating portion 53, part of the second insulating portion 53 can be damaged in the process of welding the busbar component and the first end surface 302, so that the busbar component and the first end surface 302 can be stably welded together.

[0230] By adopting the technical scheme of this embodiment, the first end surface 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, is conducive to improving the insulating effect of the electrode terminal 30, and is conducive to improving the use reliability of the battery monomer 100.

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

[0232] The first end surface 302 is electrically connected with the busbar component to input and output the electric energy of the battery monomer 100, and the busbar component can be in parallel connection, series connection, or mixed connection with multiple battery monomers 100. The busbar component is made of a metal conductive component, such as copper, aluminum, etc. The first end surface 302 is divided into two parts, one part is connected with the busbar component, i.e., the first part 3021, and the other part is not connected with the busbar component, i.e., the second part 3022.

[0233] For example, the first part 3021 can be directly connected with the busbar component to realize electrical connection. For example, the busbar component can be directly welded to the first part 3021. Of course, in other examples, there can be other electrical connection modes.

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

[0235] By adopting the technical solutions of the embodiment, the first portion 3021 is not covered by the second insulating portion 53, which can reduce the influence of the second insulating portion 53 on the electrical connection of the busbar component and the first portion 3021, and is conducive to the connection reliability of the battery monomer 100; at least a part of the second portion 3022 is covered by the second insulating portion 53, which can increase the insulating area of the electrode terminal 30, increase the insulating performance of the electrode terminal 30, and reduce the short circuit risk of the battery monomer 100, and is conducive to improving the use reliability of the battery monomer 100.

[0236] In some embodiments, the electrode terminal 30 further comprises a terminal body 31 and a cap body 32, the terminal body 31 is electrically connected with the electrode assembly 20, and the terminal body 31 penetrates through the first through hole 1011; the end surface of the terminal body 31 away from the electrode assembly 20 comprises a recessed portion 3101 and a flat portion 3102, the recessed portion 3101 is recessed towards the electrode assembly 20 relative to the flat portion 3102 to form a recessed space 3103; at least a part of the cap body 32 is installed in the recessed space 3103, and the side surface of the cap body 32 away from the electrode assembly 20 and the flat portion 3102 jointly form a first end surface 302.

[0237] The terminal body 31 can refer to the main part of the electrode terminal 30. As an example, the connecting portion 313, the first limiting portion 311 and the second limiting portion 312 constitute the terminal body 31.

[0238] As an example, along the axial direction of the first through hole 1011, the middle of the end surface of the terminal body 31 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 surface of the terminal body 31 surrounding the opening of the recessed space 3103 is a flat portion 3102, the flat portion 3102 surrounds the recessed portion 3101, and the design of the recessed space 3103 can reduce the thickness of the electrode terminal 30 at this position, facilitating the arrangement of the liquid injection hole 3104 at this position. The cap body 32 is installed in the recessed space 3103 to seal the opening of the recessed space 3103, realizing the sealing of the liquid injection hole 3104, and the liquid injection hole 3104 is integrated in the electrode terminal 30, without the need to provide a liquid injection hole 3104 on the shell 10, which is conducive to simplifying the structure of the battery monomer 100 and improving the mechanical strength of the battery monomer 100.

[0239] As an example, the cap body 32 can be sealed and installed in the recessed space 3103 by welding, a sealing ring, interference fit and the like.

[0240] By adopting the technical scheme of the embodiment, the electrode terminal 30 adopts the structure of the end body 31 and the cap body 32, the liquid injection hole 3104 can be conveniently arranged on the electrode terminal 30, the structure of the battery monomer 100 is facilitated to be simplified, and the use reliability of the battery monomer 100 is improved.

[0241] In some embodiments, the side of the cap body 32 away from the electrode assembly 20 forms the first part 3021, and the planar part 3102 forms the second part 3022, or the planar part 3102 forms the first part 3021, and the side of the cap body 32 away from the electrode assembly 20 forms the second part 3022.

[0242] It can be understood that the current-carrying component is electrically connected to the side of the cap body 32 away from the electrode assembly 20, and the end surface of the end body 31 away from the electrode terminal 30 is covered with the second insulating part 53; or the current-carrying component is electrically connected to the end surface of the end body 31 away from the electrode terminal 30, and the side of the cap body 32 away from the electrode assembly 20 is covered with the second insulating part 53.

[0243] By adopting the technical scheme of the embodiment, the current-carrying component can be electrically connected to the cap body 32 or the end body 31, the connection between the current-carrying component and the electrode terminal 30 can be flexibly arranged to meet different use requirements; in addition, the second insulating part 53 is not arranged between the current-carrying component and the electrode terminal 30, which can reduce the influence of the second insulating part 53 on the electrical connection between the current-carrying component and the electrode terminal 30, and facilitate to improve the performance of the battery monomer 100 in inputting or outputting electric energy.

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

[0245] For example, the thickness T2 of the second insulating part 53 can be 100 μm and any number between 0 μm and 100 μm, for example, but 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, 100 μm.

[0246] The design of T2 > 0 μm makes the first end surface 302 coverable with the second insulating part 53, which can increase the insulating area of the electrode terminal 30, improve the insulating performance of the electrode terminal 30, and facilitate to improve the use reliability of the battery monomer 100; in addition, the design of T2 ≤ 100 μm reduces the space occupation of the second insulating part 53, reduces the waste of materials and the manufacturing difficulty of the second insulating part 53. Therefore, the insulating performance of the electrode terminal 30 and the compactness of the structure of the battery monomer 100 can be well balanced.

[0247] In some embodiments, 0 < T2 ≤ 30 μm, which 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 part 52 comprises a second insulating subpart 521, and the second surface 301 comprises a plurality of second covering surfaces 3011, at least a portion of at least one second covering surface 3011 being covered by the second insulating subpart 521.

[0249] The second surface 301 is composed of a plurality of second covering surfaces 3011, which can be planar, arcuate, or of other shapes.

[0250] The first insulating part 52 comprises one or more second insulating subparts 521. When the number of second insulating subparts 521 is one, the second insulating subpart 521 covers one second covering surface 3011, thereby insulating and separating the electrode terminal 30 and the first side wall 101.

[0251] For example, among the plurality of second covering surfaces 3011, one second covering surface 3011 is covered by the second insulating subpart 521, thereby insulating and separating the first side wall 101 and the electrode terminal 30. The second insulating subpart 521 can cover a portion of the second covering surface 3011 or the entire second covering surface 3011.

[0252] For example, among the plurality of second covering surfaces 3011, a plurality of second covering surfaces 3011 are covered by the second insulating subpart 521, thereby insulating and separating the first side wall 101 and the electrode terminal 30.

[0253] By adopting the technical solution of this embodiment, when the first insulating part 40 softens and melts, the second insulating subpart 521 covers the second covering surface 3011, and the second insulating subpart 521 is located between the electrode terminal 30 and the first side wall 101, thereby insulating and separating the first side wall 101 and the electrode terminal 30.

[0254] In some embodiments, the thickness of the second insulating subpart 521 is T3, where 5 μm ≤ T3 ≤ 100 μm, and optionally, 10 μm ≤ T3 ≤ 30 μm.

[0255] The thickness T3 of the second insulating subpart 521 can refer to the dimension of the second insulating subpart 521 in the direction perpendicular to the corresponding second covering surface 3011. The thickness T3 of the second insulating subpart 521 covering different second covering surfaces 3011 can be the same or different.

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

[0257] The design of T3≥5 μm enables the second insulating sub-portion 521 to insulate and separate the first side wall 101 and the electrode terminal 30 when the first insulating member 40 softens and melts; in addition, the design of T3≤100 μm reduces the space occupation of the second insulating sub-portion 521, reduces the waste of materials, and reduces the difficulty of manufacturing the second insulating sub-portion 521. Therefore, the insulation of the electrode terminal 30 and the first side wall 101 and the structural compactness of the battery monomer 100 can be better balanced.

[0258] In some embodiments, 10 μm≤T3≤30 μm, the insulation of the electrode terminal 30 and the first side wall 101 and the structural compactness of the battery monomer 100 can be better balanced.

[0259] In some embodiments, the plurality of second covering surfaces 3011 includes 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 connected between the first limiting portion 311 and the second limiting portion 312; the connecting portion 313 is provided through the first through hole 1011, the first limiting portion 311 is located on the side of the first side wall 101 away from the electrode assembly 20, and the second limiting portion 312 is located in the accommodation cavity 102; the first limiting portion 311 protrudes from the outer peripheral surface of the connecting portion 313 and forms a first limiting protrusion 3111, the second limiting portion 312 protrudes from the outer peripheral surface of the connecting portion 313 and forms a second limiting protrusion 3121, and part of the first side wall 101 is located between the first limiting portion 311 and the second limiting portion 312; the outer peripheral surface of the connecting portion 313 forms the fifth surface 3013, the first limiting protrusion 3111 forms the fourth surface 3012 toward the side surface of the electrode assembly 20, and the second limiting protrusion 3121 forms the sixth surface 3014 away from the side surface of the electrode assembly 20.

[0260] Along the axial direction of the first through hole 1011, the radial dimension of the electrode terminal 30 at both ends is large, and the radial dimension in the middle is small. The part with small radial dimension in the middle forms a connecting portion 313. The first limiting portion 311 and the second limiting portion 312 are respectively formed at both ends of the electrode terminal 30. The first limiting portion 311 is located outside the battery monomer 100, and the second limiting portion 312 is located inside the battery monomer 100. The part of the first limiting portion 311 protruding from the outer circumferential surface of the connecting portion 313 forms a first limiting protrusion 3111. The part of the second limiting portion 312 protruding from the outer circumferential surface of the connecting portion 313 forms a second limiting protrusion 3121. The first limiting protrusion 3111 and the second limiting protrusion 3121 are used to clamp the first side wall 101, so as to realize the fixation of the electrode terminal 30.

[0261] For example, the radial dimension of the connecting portion 313 is smaller than the hole diameter of the first through hole 1011, so that the electrode terminal 30 can be arranged in the first through hole 1011. The radial dimension of the first limiting portion 311 is larger than the hole diameter of the first through hole 1011, and the radial dimension of the second limiting portion 312 is larger than the hole diameter of the first through hole 1011. That is, the first limiting protrusion 3111 and the second limiting protrusion 3121 block the first side wall 101, so that the electrode terminal 30 is not easy to be pulled out from the first through hole 1011, and the fixation of the electrode terminal 30 on the first side wall 101 is realized. The first limiting portion 311 and the second limiting portion 312 can be made by flanging process or machining.

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

[0263] For example, the number of the second covering surfaces 3011 is three, and the three second covering surfaces 3011 are respectively the fourth surface 3012, the fifth surface 3013 and the sixth surface 3014. Alternatively, the number of the second covering surfaces 3011 is more than three, and three of the second covering surfaces 3011 are respectively the fourth surface 3012, the fifth surface 3013 and the sixth surface 3014.

[0264] By adopting the technical scheme of the embodiment, the fixation of the electrode terminal 30 can be realized by using the first limiting protrusion 3111 and the second limiting protrusion 3121 of the electrode terminal 30. The structure is simple, and the assembly of the battery monomer 100 is facilitated.

[0265] In some embodiments, at least part of the fourth surface 3012 is covered with the second insulating sub-portion 521.

[0266] It can be understood that part of the fourth surface 3012 is covered with the second insulating sub-portion 521, or the entire fourth surface 3012 is covered with the second insulating sub-portion 521.

[0267] As an example, when the first insulating member 40 softens or melts, the fourth surface 3012 can be in contact with the first surface 10122, the fourth surface 3012 is covered with the second insulating sub-portion 521, and the second insulating sub-portion 521 can be located between the fourth surface 3012 and the first surface 10122, thereby insulating and separating the first side wall 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 a coincident area, and the projection of the second insulating sub-portion 521 covering the fourth surface 3012 at least partially coincides with the coincident area, thereby better insulating and separating the electrode terminal 30 and the first side wall 101.

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

[0270] In some embodiments, the thickness of the second insulating sub-portion 521 covering the fourth surface 3012 is T4, and along the axial direction of the first through hole 1011, the size of the first limiting protrusion 3111 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] In the case where T5 is constant, the design of T4 / T5≥0.005 makes the second insulating sub-portion 521 capable of insulating and separating the fourth surface 3012 and the first side wall 101 when the first insulating member 40 softens and melts, thereby achieving the insulation of the electrode terminal 30 and the first side wall 101; in addition, the design of T4 / T5≤0.2 can reduce the space occupation of the second insulating sub-portion 521 and reduce the waste of materials. Therefore, the insulation of the electrode terminal 30 and the first side wall 101 and the compactness of the battery monomer 100 can be well balanced.

[0273] In some embodiments, at least part of the fifth surface 3013 is covered with the second insulating sub-portion 521.

[0274] It can be understood that part of the fifth surface 3013 is covered with the second insulating sub-portion 521, or the entire fifth surface 3013 is covered with the second insulating sub-portion 521.

[0275] As an example, when the first insulating member 40 softens or melts, the fifth surface 3013 can be in contact with the second surface 10123, the fifth surface 3013 is covered with the second insulating sub-portion 521, and the second insulating sub-portion 521 can be located between the fifth surface 3013 and the second surface 10123, thereby insulating and separating the first side wall 101 and the electrode terminal 30.

[0276] As an example, the fifth surface 3013 is located in the second surface 10123, and at least the region of the fifth surface 3013 opposite to the second surface 10123 is covered with the second insulating sub-portion 521, so as to better insulate and separate the electrode terminal 30 and the first side wall 101.

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

[0278] In some embodiments, the thickness of the second insulating sub-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 portion 313 can refer to the dimension in the axial direction perpendicular to the first through hole 1011. As an example, the radial dimension of the connecting portion 313 can refer to the diameter of the connecting portion 313.

[0280] As an example, T6 / (D1+2T6) is 0.0003, 0.05, or any number between 0.0003 and 0.05. As an 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, 0.05.

[0281] In the case of (D1+2T6), the design of T6 / (D1+2T6)≥0.0003 makes the second insulator part 521 insulate the fifth surface 3013 and the first side wall 101 when the first insulating part 40 softens and melts, so as to insulate the electrode terminal 30 and the first side wall 101. In addition, the design of T6 / (D1+2T6)≤0.05 can reduce the space occupation of the second insulator part 521, increase the radial size of the connecting part 313, improve the current-carrying capacity of the connecting part 313, and improve the fast-charging performance of the battery monomer 100. Therefore, the insulation of the electrode terminal 30 and the first side wall 101 and the fast-charging performance of the battery monomer 100 can be well balanced.

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

[0283] It can be understood that part of the sixth surface 3014 is covered with the second insulator part 521, or the entire sixth surface 3014 is covered with the second insulator part 521.

[0284] As an example, when the first insulating part 40 softens or melts, the sixth surface 3014 can be in contact with the third surface 10124, the sixth surface 3014 is covered with the second insulator part 521, and the second insulator part 521 can be located between the sixth surface 3014 and the third surface 10124, thereby insulating and separating the first side wall 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 a coincident area, and the projection of the second insulator part 521 covering the sixth surface 3014 at least partially coincides with the coincident area, so as to better insulate and separate the electrode terminal 30 and the first side wall 101.

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

[0287] In some embodiments, the thickness of the second insulator part 521 covering the sixth surface 3014 is T7, the size of the second limiting protrusion 3121 along the axial direction of the first through hole 1011 is T8, and 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, but not limited to, the value of T7 / T8 can be 0.005, 0.01, 0.05, 0.1, 0.15, or 0.2.

[0289] In the case of T8 being constant, the design of T7 / T8≥0.005 makes the second insulator part 521 insulate the sixth surface 3014 and the first side wall 101 when the first insulating part 40 softens and melts, so as to insulate the electrode terminal 30 and the first side wall 101. In addition, the design of T7 / T8≤0.2 can reduce the space occupation of the second insulator part 521 and reduce the waste of materials. Therefore, the insulation of the electrode terminal 30 and the first side wall 101 and the compactness of the battery monomer 100 can be well balanced.

[0290] In some embodiments, the second insulating part 50 comprises the first insulator part 51, the first surface 1012 comprises a plurality of first covering surfaces 10121, the plurality of first covering surfaces 10121 comprises a first surface 10122, a second surface 10123 and a third surface 10124, the first surface 10122 is arranged away from the electrode assembly 20, the third surface 10124 is arranged 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 the first through hole 1011; at least part of the first surface 10122 is covered by the first insulator part 51, and in the direction of the fifth surface 3013 pointing to the second surface 10123, the first insulator part 51 covering the first surface 10122 protrudes from the side of the first limiting protrusion 3111 away from the fifth surface 3013; and / or, at least part of the third surface 10124 is covered by the first insulator part 51, and in the direction of the fifth surface 3013 pointing to the second surface 10123, the first insulator part 51 covering the third surface 10124 protrudes from the side of the second limiting protrusion 3121 away from the fifth surface 3013.

[0291] The direction of the fifth surface 3013 pointing to the second surface 10123 can refer to the radial direction of the first through hole 1011, and specifically can refer to the direction indicated by the arrow X in Figures 2-4 .

[0292] In some examples, 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 includes a first surface 10122, a second surface 10123 and a third surface 10124, the first surface 10122 is arranged away from the electrode assembly 20, the third surface 10124 is arranged 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 the first through hole 1011; at least part of the first surface 10122 is covered by the first insulator portion 51, and in the direction of the fifth surface 3013 pointing 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. In the axial direction of the first through hole 1011, part of the first insulator portion 51 covering the first surface 10122 is shielded by the first limiting protrusion 3111, and the other part is exposed outside the first limiting protrusion 3111, and the outside area of the first surface 10122 opposite to the first limiting protrusion 3111 is also covered by the first insulator portion 51, and the insulation covering area of the first surface 10122 is large, when the first insulating member 40 softens or melts, the first limiting protrusion 3111 and the first surface 10122 can be completely separated by the first insulator portion 51, the first insulator portion 51 can better insulate and separate the first surface 10122 and the first limiting protrusion 3111, which is beneficial to improve the insulation reliability of the electrode terminal 30 and the first side wall 101.

[0293] As an example, the first limiting protrusion 3111 has a circular ring structure, the first limiting protrusion 3111 surrounds the electrode terminal 30 outside, the first insulator portion 51 covering the first surface 10122 has a circular ring shape, the inner diameter of the first insulator portion 51 covering the first surface 10122 is equal to the hole 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 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 includes a first surface 10122, a second surface 10123 and a third surface 10124, the first surface 10122 is arranged away from the electrode assembly 20, the third surface 10124 is arranged 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 the first through hole 1011; at least part of the third surface 10124 is covered by the first insulator portion 51, and in the direction of the fifth surface 3013 pointing 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. In the axial direction of the first through hole 1011, part of the first insulator portion 51 covering the third surface 10124 is shielded by the second limiting protrusion 3121, and the other part is exposed outside the second limiting protrusion 3121, and the outer side area of the third surface 10124 opposite to the second limiting protrusion 3121 is also covered by the first insulator portion 51, and the insulation covering 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 improve the insulation reliability of the electrode terminal 30 and the first side wall 101.

[0295] As an example, the second limiting protrusion 3121 has a circular ring structure, the second limiting protrusion 3121 is annularly arranged outside the electrode terminal 30, the first insulator portion 51 covering the third surface 10124 has a circular ring shape, the inner diameter of the first insulator portion 51 covering the third surface 10124 is equal to the hole 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 comprises a first insulator portion 51, the first surface 1012 comprises a plurality of first covering surfaces 10121, the plurality of first covering surfaces 10121 comprises a first surface 10122, a second surface 10123 and a third surface 10124, the first surface 10122 is arranged away from the electrode assembly 20, the third surface 10124 is arranged 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 the first through hole 1011; at least part of the first surface 10122 is covered by the first insulator portion 51, and in the direction of the fifth surface 3013 pointing 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; at least part of the third surface 10124 is covered by the first insulator portion 51, and in the direction of the fifth surface 3013 pointing 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 side wall 101, which is conducive to improving the insulation reliability of the electrode terminal 30 and the first side wall 101.

[0297] By adopting the technical scheme 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 side wall 101, which is conducive to improving the insulation reliability of the electrode terminal 30 and the first side wall 101.

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

[0299] The electrode terminal 30 is arranged in the first insulating member 40, the first insulating member 40 is arranged in the first through hole 1011, and the first insulating member 40 is clamped and fixed between the hole wall of the first through hole 1011 and the electrode terminal 30; the part of the first insulating member 40 between the first face 10122 and the fourth face 3012 is the first insulating area 41, the part of the first insulating member 40 between the second face 10123 and the fifth face 3013 is the second insulating area 42, and the part of the first insulating member 40 between the third face 10124 and the sixth face 3014 is the third insulating area 43. The first insulating area 41 can be completely located between the first face 10122 and the fourth face 3012, or a part of the first insulating area 41 is located between the first face 10122 and the fourth face 3012, and the other part is arranged on the outer circumferential side of the first limiting protrusion 3111 to shield the side of the first limiting protrusion 3111 away from the fifth face 3013, so as to better realize the insulation of the electrode terminal 30. The third insulating area 43 can be completely located between the third face 10124 and the sixth face 3014, or a part of the third insulating area 43 is located between the third face 10124 and the sixth face 3014, and the other part is arranged on the outer circumferential side of the second limiting protrusion 3121 to shield the side of the second limiting protrusion 3121 away from the fifth face 3013, so as to better realize the insulation of the electrode terminal 30.

[0300] The first insulating area 41, the second insulating area 42 and the third insulating area 43 can be integrally formed or separately formed and then connected together; the first insulating area 41, the second insulating area 42 and the third insulating area 43 can be arranged to form a U-shaped structure, the first insulating member 40 is clamped into the groove formed by the fourth face 3012, the fifth face 3013 and the sixth face 3014, and the edge of the first side wall 101 close to the first through hole 1011 is clamped into the U-shaped structure, so as to realize the fixation of the electrode terminal 30 and the insulation between the electrode terminal 30 and the first side wall 101.

[0301] By adopting the technical scheme of the embodiment, the fourth face 3012 of the electrode terminal 30 and the first face 10122 of the first side wall 101 are insulated and separated by the first insulating area 41, the fifth face 3013 of the electrode terminal 30 and the second face 10123 of the first side wall 101 are insulated and separated by the second insulating area 42, and the sixth face 3014 of the electrode terminal 30 and the third face 10124 of the first side wall 101 are insulated and separated by the third insulating area 43, so as to realize the three-face insulation between the electrode terminal 30 and the first side wall 101, which is beneficial to improve the insulation effect of the electrode terminal 30 and the first side wall 101 and improve the use reliability of the battery monomer 100.

[0302] In some embodiments, at least part of the first surface 10122 is covered with the first insulation sub-portion 51, and the first insulation sub-portion 51 covering the first surface 10122 protrudes from the side of the first insulation region 41 away from the fifth surface 3013 in the direction of the second surface 10123 along the fifth surface 3013; and / or at least part of the third surface 10124 is covered with the first insulation sub-portion 51, and the first insulation sub-portion 51 covering the third surface 10124 protrudes from the side of the third insulation region 43 away from the fifth surface 3013 in the direction of the second surface 10123 along the fifth surface 3013.

[0303] In some examples, at least part of the first surface 10122 is covered with the first insulation sub-portion 51, and the first insulation sub-portion 51 covering the first surface 10122 protrudes from the side of the first insulation region 41 away from the fifth surface 3013 in the direction of the second surface 10123 along the fifth surface 3013; and / or at least part of the third surface 10124 is covered with the first insulation sub-portion 51, and the first insulation sub-portion 51 covering the third surface 10124 protrudes from the side of the third insulation region 43 away from the fifth surface 3013 in the direction of the second surface 10123 along the fifth surface 3013.

[0304] As an example, the first insulation region 41 is in a circular ring structure, and the first insulation region 41 is annularly arranged outside the electrode terminal 30; the first insulation sub-portion 51 covering the first surface 10122 is in a circular ring structure, and the outer diameter of the first insulation sub-portion 51 covering the first surface 10122 is greater than the outer diameter of the first insulation region 41.

[0305] In some examples, at least part of the third surface 10124 is covered with the first insulation sub-portion 51, and the first insulation sub-portion 51 covering the third surface 10124 protrudes from the side of the third insulation region 43 away from the fifth surface 3013 in the direction of the second surface 10123 along the fifth surface 3013. In the axial direction of the first through hole 1011, the first insulation sub-portion 51 covering the third surface 10124 exposes the third insulation region 43, and the outer side region of the third surface 10124 opposite to the third insulation region 43 is also covered with the first insulation sub-portion 51. The insulation coverage area of the third surface 10124 is large, and the third insulation region 43 and the third surface 10124 can be completely separated by the first insulation sub-portion 51. When the first insulation member 40 softens or melts, the first insulation sub-portion 51 has good insulation effect in insulating the third surface 10124 and the third insulation region 43, which is conducive to improving the insulation reliability of the electrode terminal 30 and the first side wall 101.

[0306] As an example, the third insulating region 43 is in a circular ring structure, the third insulating region 43 is arranged around the electrode terminal 30, and the first insulating sub 51 covering the third face 10124 is in a circular ring structure, and the outer diameter of the first insulating sub 51 covering the third face 10124 is greater than the outer diameter of the third insulating region 43.

[0307] In some examples, at least part of the first face 10122 is covered by the first insulating sub 51, and in the direction of the fifth face 3013 pointing to the second face 10123, the first insulating sub 51 covering the first face 10122 protrudes from the side of the first insulating region 41 away from the fifth face 3013; at least part of the third face 10124 is covered by the first insulating sub 51, and in the direction of the fifth face 3013 pointing to the second face 10123, the first insulating sub 51 covering the third face 10124 protrudes from the side of the third insulating region 43 away from the fifth face 3013, so that when the first insulating piece 40 softens or melts, the first insulating sub 51 can better insulate and separate the electrode terminal 30 and the first side wall 101, which is conducive to improving the insulation reliability of the electrode terminal 30 and the first side wall 101.

[0308] By adopting the technical scheme of this embodiment, when the first insulating piece 40 softens or melts, the first insulating sub 51 can better insulate and separate the electrode terminal 30 and the first side wall 101, which is conducive to improving the insulation reliability of the electrode terminal 30 and the first side wall 101.

[0309] In some embodiments, the second insulating piece 50 includes a third insulating portion 54, and at least part of the side of the first limiting protrusion 3111 away from the fifth face 3013 is covered by the third insulating portion 54 in the radial direction of the first through hole 1011; and / or, the second insulating piece 50 includes a fourth insulating portion 55, and at least part of the side of the second limiting protrusion 3121 away from the fifth face 3013 is covered by the fourth insulating portion 55 in the radial direction of the first through hole 1011.

[0310] In some examples, the second insulating piece 50 includes a third insulating portion 54, and at least part of the side of the first limiting protrusion 3111 away from the fifth face 3013 is covered by the third insulating portion 54 in the radial direction of the first through hole 1011; part of the side of the first limiting protrusion 3111 away from the fifth face 3013 is covered by the third insulating portion 54, or the entire side of the first limiting protrusion 3111 away from the fifth face 3013 is covered by the third insulating portion 54; when the first insulating piece 40 softens or melts, the third insulating portion 54 can insulate and separate the side of the first limiting protrusion 3111 away from the fifth face 3013 and the first side wall 101, which can improve the insulation reliability between the electrode terminal 30 and the first side wall 101.

[0311] In some examples, the second insulating member 50 includes a fourth insulating portion 55, and along the radial direction of the first through hole 1011, at least part of the side of the second limiting protrusion 3121 away from the fifth surface 3013 is covered by the fourth insulating portion 55; or part 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 insulate and separate the side of the second limiting protrusion 3121 away from the fifth surface 3013 and the first side wall 101, and the insulation reliability between the electrode terminal 30 and the first side wall 101 can be improved.

[0312] In some examples, the second insulating member 50 includes a third insulating portion 54, and along the radial direction of the first through hole 1011, at least part of the side of the first limiting protrusion 3111 away from the fifth surface 3013 is covered by the third insulating portion 54; the second insulating member 50 includes a fourth insulating portion 55, and along the radial direction of the first through hole 1011, at least part of the side of the second limiting protrusion 3121 away from the fifth surface 3013 is covered by the fourth insulating portion 55. Thus, 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 side wall 101, and the insulation reliability between the electrode terminal 30 and the first side wall 101 can be improved.

[0313] By adopting the technical scheme of the 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 side wall 101, and the insulation reliability between the electrode terminal 30 and the first side wall 101 can be improved.

[0314] In some embodiments, the second insulating member 50 includes a fifth insulating portion 56, and the electrode terminal 30 has a second end surface 303, the second end surface 303 is arranged towards the electrode assembly 20, the second end surface 303 includes a third part 3031 and a fourth part 3032, the electrode assembly 20 is connected to the third part 3031, the fourth part 3032 is not electrically connected to the electrode assembly 20, and the fourth part 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 towards the electrode assembly 20 is the second end surface 303, the second end surface 303 is electrically connected to the tab of the electrode assembly 20 to input and output the electric energy of the battery monomer 100. The second end surface 303 is divided into two parts, one part is connected to the tab of the electrode assembly 20, which is the third part 3031, and the other part is not connected to the tab of the electrode assembly 20, which is the fourth part 3032.

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

[0317] By adopting the technical solutions of the embodiment, the third portion 3031 is not covered by the fifth insulation part 56, which can reduce the influence of the fifth insulation 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 portion 3032 is covered by the fifth insulation part 56, which can increase the insulation performance of the electrode terminal 30 and reduce the risk of short circuit of the battery monomer 100, and is conducive to improving the use reliability of the battery monomer 100.

[0318] In some embodiments, the thickness of the fifth insulation part 56 is T9, where 0 < T9 ≤ 30 μm.

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

[0320] The design of T9 > 0 μm makes the second end surface 303 coverable by the fifth insulation part 56, which can increase the insulation area of the electrode terminal 30 and improve the insulation performance of the electrode terminal 30, and is conducive to improving the use reliability of the battery monomer 100; in addition, the design of T9 ≤ 30 μm reduces the space occupation of the fifth insulation part 56, reduces the waste of materials and the manufacturing difficulty of the fifth insulation part 56, and the thickness of the fifth insulation part 56 is thin and is also easy to be damaged, thereby facilitating the welding of the electrode terminal 30 and the tab of the electrode assembly 20. Therefore, the insulation performance of the electrode terminal 30, the structural compactness of the battery monomer 100, and the electrical connection between the electrode assembly 20 and the electrode terminal 30 can be better balanced.

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

[0322] In some embodiments, the electrode terminal 30 is an aluminum terminal, and the outer surface of the electrode terminal 30 is subjected to an oxidation process or a nitriding process to obtain the second insulation part 50.

[0323] The electrode terminal 30 is made of aluminum, and the surface of the aluminum can be subjected to an oxidation process or a nitriding process to obtain aluminum oxide (Al2O3) or aluminum nitride (AIN), which has high high-temperature resistance and good insulation performance, so that the insulation between the electrode terminal 30 and the first side wall 101 can be realized when the first insulation part 40 softens or melts.

[0324] By adopting the technical scheme of the embodiment, the electrode terminal 30 is made of aluminum, and the second insulating part 50 is made of the surface of the electrode terminal 30 through an oxidation process or a nitriding process, so that the manufacturing method is simple and the manufacturing cost of the electrode terminal 30 is reduced.

[0325] In some embodiments, aluminum oxide (Al2O3) or aluminum nitride (AlN) is covered on the fourth surface 3012, the fifth surface 3013, the sixth surface 3014, the first end surface 302 and the second end surface 303 of the electrode terminal 30, so as to cover the entire outer surface of the electrode terminal 30, and the aluminum oxide or the aluminum nitride is made through the oxidation process or the nitriding process, so that the manufacturing process is simple and the manufacturing cost is reduced; in the welding process, the aluminum oxide and the aluminum nitride are damaged, so that the first end surface 302 and the busbar part and the second end surface 303 and the tab of the electrode assembly 20 are stably welded together; in other examples, the aluminum oxide or the aluminum nitride can also only cover the fourth surface 3012, the fifth surface 3013 and the sixth surface 3014 of the electrode terminal 30, and of course there are other covering modes.

[0326] In some embodiments, the entire outer surface of the terminal body 31 is made of the second insulating part 50 through the oxidation process or the nitriding process, so that the entire surface is oxidized or nitrided, the manufacturing process is simple, and the manufacturing cost is reduced.

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

[0328] The aluminum oxide part can refer to a part made of aluminum oxide.

[0329] The zirconium oxide part can refer to a part made of zirconium oxide.

[0330] The magnesium silicate part can refer to a part made of magnesium silicate.

[0331] The aluminum nitride part can refer to a part made of aluminum nitride.

[0332] The boron nitride part can refer to a part made of boron nitride.

[0333] The silicon carbide part can refer to a part made of silicon carbide.

[0334] The thermosetting polyimide part can refer to a part made of thermosetting polyimide.

[0335] It can be understood that the material of the second insulating member includes one or more of aluminum oxide (Al2O3), zirconium oxide (ZrO2), magnesium silicate (MgSiO3), aluminum nitride (AlN), boron nitride (BN), silicon carbide (SiC), and thermosetting polyimide.

[0336] By adopting the technical scheme of this embodiment, the second insulating member 50 adopts the structure described above, and can insulate and separate the first side wall 101 and the electrode terminal 30 when the first insulating member 40 softens or melts, thereby improving the use reliability of the battery monomer 100.

[0337] In some embodiments, the shell 10 includes an end cover 11 and a shell body 12, the shell body 12 is arranged to form a receiving cavity 102, the end cover 11 is arranged at the opening of the receiving cavity 102, and the side wall of the shell body 12 opposite to the end cover 11 forms the first side wall 101.

[0338] The electrode terminal 30 is arranged on the shell body 12, and the electrode terminal 30 and the end cover 11 are respectively located at opposite sides of the battery monomer 100.

[0339] By adopting the technical scheme of this embodiment, the electrode terminal 30 is arranged on the shell body 12, which can increase the overall structural stability of the battery monomer 100, and is conducive to improving the use reliability of the battery monomer 100.

[0340] In some embodiments, the electrode assembly 20 includes a body 21 and first and second tabs 22 and 23 with different polarities, the body 21 leads out the first tab 22 towards the end of the end cover 11, the body 21 leads out the second tab 23 towards the end of the first side wall 101, the first tab 22 is electrically connected to the end cover 11, and the second tab 23 is electrically connected to the electrode terminal 30.

[0341] The positive main body part, the negative main body part, and the separator collectively form the body 21, one of the first and second tabs 22 and 23 is a positive tab, and the other is a negative tab. The first and second tabs 22 and 23 are respectively arranged at opposite ends of the body 21, which can reduce the risk of short circuit of the first and second tabs 22 and 23.

[0342] The first tab 22 is electrically connected with the end cover 11, so that the end cover 11 or the shell 12 can serve as one output pole of the battery monomer 100, the second tab 23 is electrically connected with the electrode terminal 30, so that the electrode terminal 30 serves as another output pole of the battery monomer 100, the first insulating piece 40 and the second insulating piece 50 can insulate and separate the electrode terminal 30 and the shell 12 in double layers, so that the insulation reliability of the electrode terminal 30 and the shell 12 can be better improved, the risk of short circuit of the battery monomer 100 can be better reduced, and the use reliability of the battery monomer 100 can be improved; in addition, the end cover 11 and the shell 12 serve as the output poles of the battery monomer 100, so that the mutual electrical connection between the battery monomers 100 can be facilitated, and the structure of the battery monomer 100 can be simplified, and the processing and manufacturing are facilitated.

[0343] In some embodiments, the battery monomer 100 is a cylindrical battery monomer 100 or a prismatic battery monomer 100.

[0344] The battery monomer 100 is a cylindrical battery monomer 100, the shell 10 of the battery monomer 100 is in a cylindrical shape, and the electrode assembly 20 is in a cylindrical shape.

[0345] The battery monomer 100 is a prismatic battery monomer 100, the shell 10 of the battery monomer 100 is in a prismatic shape, and the electrode assembly 20 is in a cylindrical shape or a prismatic shape.

[0346] The technical scheme of the embodiments of the present application can be applied to cylindrical battery monomers 100 and prismatic battery monomers 100, and has a wide application range.

[0347] The present application will be described below in combination with some specific embodiments.

[0348] Embodiment one

[0349] In the embodiment, the battery monomer 100 is a cylindrical battery monomer 100, and the battery monomer 100 includes a shell 10, an electrode assembly 20, an electrode terminal 30, a first insulating piece 40 and a second insulating piece 50. The shell 10 includes an end cover 11 and a shell body 12, the electrode assembly 20 is arranged in the shell body 12, the end cover 11 is arranged at the opening of the shell body 12, the side wall opposite to the end cover 11 of the shell body 12 forms a first side wall 101, the first side wall 101 is provided with a first through hole 1011, the electrode terminal 30 is installed in the first through hole 1011, the first insulating piece 40 is arranged between the electrode terminal 30 and the first side wall 101 to insulate and separate the first side wall 101 and the electrode terminal 30, the second insulating piece 50 is arranged between the first insulating piece 40 and the electrode terminal 30, the second insulating piece 50 is arranged between the first insulating piece 40 and the first side wall 101, and the heat resistance of the second insulating piece 50 is greater than that of the first insulating piece 40.

[0350] In this embodiment, the second insulating member 50 has a melting point greater than the melting point of the first insulating member 40, or the second insulating member 50 has a thermal weight loss temperature greater than the melting point of the first insulating member 40.

[0351] In this embodiment, the first side wall 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 oppositely arranged, the second insulating member 50 includes a first insulating sub-member 51, 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 arranged away from the electrode assembly 20, the third surface 10124 is arranged toward 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 the first through hole 1011; the first surface 10122, the second surface 10123 and the third surface 10124 are covered with the first insulating sub-member 51.

[0352] In this embodiment, the electrode terminal 30 is an aluminum terminal, the outer surface of the electrode terminal 30 is subjected to an oxidation process or a nitriding process to form aluminum oxide or aluminum nitride, and the aluminum oxide or aluminum nitride forms the second insulating member 50.

[0353] Embodiment Two

[0354] The difference between this embodiment and Embodiment One is that the outer peripheral surface of the electrode terminal 30 is covered with a layer of thermosetting polyimide, and the layer of thermosetting polyimide forms the second insulating member 50.

[0355] In some embodiments, referring to Figure 5 As shown, a battery apparatus 1100 is provided, which includes a plurality of the above-described battery cells 100.

[0356] The battery apparatus 1100 (Battery Apparatus) mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly (Battery Cell Assembly) can include a plurality of battery cells 100, and the plurality of battery cells 100 are connected in series, in parallel or in a mixed connection manner through a busbar component.

[0357] In some examples, the battery cell assembly (Battery Cell Assembly) is generally formed by arranging a plurality of battery cells 100.

[0358] As an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing a plurality of battery cells 100. As an example, the battery module can be formed by bundling a plurality of battery cells 100 by a cable tie.

[0359] In some examples, the battery device 1100 can be a battery pack, which includes a case 200 and one or more battery cell assemblies accommodated in the case 200.

[0360] As an example, the battery cell assembly can be a battery module, which can be accommodated in the case 200 by fixing the battery module in the case 200.

[0361] As an example, the battery cell assembly can also be accommodated in the case 200 by directly fixing a plurality of battery cells 100 in the case 200.

[0362] As an example, the case 200 can include a first case 210 and a second case 220. The first case 210 and the second case 220 are buckled so that an enclosed space is formed inside the case 200 to accommodate the battery cell assembly. Here, the enclosed means covered or closed, which can be sealed or unsealed. The first case 210 can be a top cover or a bottom plate.

[0363] As an example, the case 200 can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are connected with the frame, so that an enclosed space is formed inside the case 200 to accommodate the battery cell assembly.

[0364] In some examples, the case 200 can be part of the chassis structure of the vehicle 1000. For example, part of the case 200 can be at least part of the floor of the vehicle 1000, or part of the case 200 can be at least part of the cross beam and the longitudinal beam of the vehicle 1000.

[0365] The battery device 1100 of the embodiments of the present application uses the battery cell 100 described above, and the use reliability of the battery cell 100 is good, which is conducive to improving the use reliability of the battery device 1100.

[0366] In some embodiments, referring to Figure 6 As shown, a power consuming device is provided, which includes the battery cell 100 described above or the battery device 1100 described above, and the battery cell 100 or the battery device 1100 is used to store or provide electric energy.

[0367] The technical solutions described in the embodiments of the present application are applicable to various power consumption devices using the battery monomer 100, such as mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles 1000, ships, and spacecraft, such as aircraft, rockets, space shuttles, and spacecraft.

[0368] The following embodiments are described for the convenience of illustration, taking the vehicle 1000 as an example.

[0369] The vehicle 1000 can be a fuel car, a gas car, or a new energy car, and the new energy car can be a pure electric car, a hybrid car, or an extended range car. The vehicle 1000 is internally provided with a battery, which can be arranged at the bottom, head, or tail of the vehicle 1000. The battery can be used for power supply of the vehicle 1000, for example, the battery can be used as an operating power supply of the vehicle 1000. The vehicle 1000 can also include a controller 1200 and a motor 1300, and the controller 1200 is used to control the battery to supply power to the motor 1300, for example, for the power consumption demand of the vehicle 1000 during starting, navigation, and driving.

[0370] In some embodiments of the present application, the battery can not only be used as an operating power supply of the vehicle 1000, but also be used as a driving power supply of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.

[0371] The power consumption device of the embodiments of the present application uses the battery monomer 100 or the battery device 1100 described above, and the use reliability of the battery monomer 100 and the battery device 1100 is good, which is beneficial to improve the use reliability of the power consumption device.

[0372] The above description of each embodiment tends to emphasize the differences between each embodiment, and the same or similar parts can be referred to each other, and for the sake of brevity, the details are not described herein.

[0373] Finally, it should be pointed out that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized by, The application relates to a battery, comprising: a shell having a first sidewall and a receiving cavity, the first sidewall having a first through hole communicating with the receiving cavity; an electrode assembly arranged at least partially in the receiving cavity; an electrode terminal electrically connected with the electrode assembly through the first through hole; a first insulating member arranged between the electrode terminal and the first sidewall to insulate the electrode terminal from the first sidewall; a second insulating member arranged between at least part of the first insulating member and the electrode terminal and / or arranged between at least part of the first insulating member and the first sidewall; wherein the second insulating member has a higher heat resistance than the first insulating member.

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

3. The battery cell of claim 1, wherein: The melting point or thermal weight loss temperature of the second insulating member is higher than or equal to 300 DEG C.

4. The battery cell of claim 3, wherein: The melting point or thermal weight loss temperature of the second insulating member is higher than or equal to 500 DEG C.

5. The battery cell of claim 4, wherein: The melting point or thermal weight loss temperature of the second insulating member is higher than or equal to 700 DEG C.

6. The battery cell of any one of claims 1-5, wherein: The electrical resistivity of the second insulating piece is greater than or equal to 1*10 12 Ω-cm.

7. The battery cell of any one of claims 1-5, wherein: The first sidewall comprises a first surface, the outer surface of the electrode terminal comprises a second surface, the first surface and the second surface are oppositely arranged, and the first insulating member and the second insulating member are located between the first surface and the second surface.

8. The battery cell of claim 7, wherein: The second insulating member is arranged between the first insulating member and the first sidewall and covers at least part of the first surface.

9. The battery cell of claim 8, wherein: The second insulating member comprises a first insulating sub-member, the first surface comprises a plurality of first covering surfaces, and at least part of at least one of the first covering surfaces is covered by the first insulating sub-member.

10. The battery cell of claim 9, wherein: The thickness of the first insulating sub-member is T1, wherein 5 mu m <= T1 <= 100 mu m.

11. The battery cell of claim 10, wherein: 10 mu m <= T1 <= 30 mu m.

12. The battery cell of claim 9, wherein: The plurality of first covering surfaces comprise a first surface, a second surface and a third surface, the first surface is arranged away from the electrode assembly, the third surface is arranged towards the electrode assembly, the second surface is connected between the first surface and the second surface, and the second surface surrounds the first through hole; At least one of at least part of the first surface, at least part of the second surface and at least part of the third surface is covered by the first insulating sub-member.

13. The battery cell of claim 7, wherein: The outer surface of the electrode terminal is covered by the second insulating member, the second insulating member comprises a first insulating member, and the first insulating member covers at least part of the second surface.

14. The battery cell of claim 13, wherein: The area of the outer surface of the electrode terminal is S1, the covering area of the electrode terminal covered by the second insulating member is S2, and 0.35 <= S2 / S1 <= 0.

85.

15. The battery cell of claim 14, wherein: 0.45 <= S2 / S1 <= 0.

75.

16. The battery cell of claim 13, wherein: The second insulating member comprises a second insulating member, the outer surface of the electrode terminal comprises a first end surface, the first end surface is arranged away from the electrode assembly, and at least part of the first end surface is covered by the second insulating member.

17. The battery cell of claim 16, wherein: The first end surface comprises a first part and a second part, the first part is used for electrical connection with the busbar component, the second part is not used for electrical connection with the busbar component, the first part is not covered by the second insulation part, and at least part of the second part is covered by the second insulation part.

18. The battery cell of claim 17, wherein: The electrode terminal further comprises an end body and a cap body, the end body is electrically connected with the electrode assembly, and the end body is arranged in the first through hole; An end surface of the end body away from the electrode assembly comprises a recessed part and a planar part, the recessed part is recessed towards the electrode assembly relative to the planar part to form a recessed space; at least part of the cap body is arranged in the recessed space, and a side surface of the cap body away from the electrode assembly and the planar part jointly form the first end surface.

19. The battery cell of claim 18, wherein: The side surface of the cap body away from the electrode assembly forms the first part, and the planar part forms the second part; or, the planar part forms the first part, and the side surface of the cap body away from the electrode assembly forms the second part.

20. The battery cell of claim 16, wherein: The thickness of the second insulation part is T2, where 0 < T2 ≤ 100 μm.

21. The battery cell of claim 20, wherein: 0 < T2 ≤ 30 μm.

22. The battery cell of claim 13, wherein: The first insulation part comprises a second insulation subpart, and the second surface comprises a plurality of second covering surfaces, at least part of at least one of the second covering surfaces is covered by the second insulation subpart.

23. The battery cell of claim 22, wherein: The thickness of the second insulation subpart is T3, where 5 μm ≤ T3 ≤ 100 μm.

24. The battery cell of claim 23, wherein: 10 μm ≤ T3 ≤ 30 μm.

25. The battery cell of claim 22, wherein: The plurality of second covering surfaces comprises a fourth surface, a fifth surface and a sixth surface; The electrode terminal comprises 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 part is arranged in the first through hole, the first limiting part is located on one side of the first side wall away from the electrode assembly, and the second limiting part is located in the accommodation cavity; the first limiting part protrudes from the outer peripheral surface of the connecting part and forms a first limiting protrusion, the second limiting part protrudes from the outer peripheral surface of the connecting part and forms a second limiting protrusion, and part of the first side wall is located between the first limiting part and the second limiting part; The outer peripheral surface of the connecting part forms the fifth surface, the side surface of the first limiting protrusion towards the electrode assembly forms the fourth surface, and the side surface of the second limiting protrusion away from the electrode assembly forms the sixth surface.

26. The battery cell of claim 25, wherein: At least part of the fourth surface is covered by the second insulation subpart.

27. The battery cell of claim 26, wherein: The thickness of the second insulation subpart 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, where 0.005 ≤ T4 / T5 ≤ 0.

2.

28. The battery cell of claim 25, wherein: At least part of the fifth surface is covered by the second insulation subpart.

29. The battery cell of claim 28, wherein: The thickness of the second insulation subpart covering the fifth surface is T6, and the radial size of the connecting part is D1, where 0.0003 ≤ T6 / (D1+2T6) ≤ 0.

05.

30. The battery cell of claim 25, wherein: At least part of the sixth surface is covered by the second insulation subpart.

31. The battery cell of claim 30, wherein: A thickness of the second insulating subpart covering the sixth face is T7, a size of the second limiting protrusion is T8 along an axial direction of the first through hole, and 0.005≤T7 / T8≤0.

2.

32. The battery cell of claim 25, wherein: The second insulating part includes a first insulating subpart, the first surface includes a plurality of first covering faces, the plurality of first covering faces include a first face, a second face and a third face, the first face is arranged away from the electrode assembly along an axial direction of the first through hole, the third face is arranged towards the electrode assembly, and the second face is connected between the first face and the second face and surrounds to form the first through hole. At least a part of the first face is covered by the first insulating subpart, and the first insulating subpart covering the first face protrudes away from a side face of the first limiting protrusion along a direction of the fifth face pointing to the second face. At least a part of the third face is covered by the first insulating subpart, and the first insulating subpart covering the third face protrudes away from a side face of the second limiting protrusion along a direction of the fifth face pointing to the second face.

33. The battery cell of claim 32, wherein: The first insulating part includes a first insulating zone part, a second insulating zone part and a third insulating zone part connected with each other, at least a part of the first insulating zone part is located between the first face and the fourth face, the second insulating zone part is located between the second face and the fifth face, and at least a part of the third insulating zone part is located between the third face and the sixth face.

34. The battery cell of claim 33, wherein: At least a part of the first face is covered by the first insulating subpart, and the first insulating subpart covering the first face protrudes away from a side face of the first insulating zone part along a direction of the fifth face pointing to the second face. At least a part of the third face is covered by the first insulating subpart, and the first insulating subpart covering the third face protrudes away from a side face of the third insulating zone part along a direction of the fifth face pointing to the second face.

35. The battery cell of claim 25, wherein: The second insulating part includes a third insulating part, at least a part of a side face of the first limiting protrusion away from the fifth face is covered by the third insulating part along a radial direction of the first through hole. The second insulating part includes a fourth insulating part, at least a part of a side face of the second limiting protrusion away from the fifth face is covered by the fourth insulating part along a radial direction of the first through hole.

36. The battery cell of claim 13, wherein: The second insulating part includes a fifth insulating part, the electrode terminal has a second end face arranged towards the electrode assembly along an axial direction of the first through hole, the second end face includes a third part and a fourth part, the electrode assembly is connected to the third part, the fourth part is not electrically connected to the electrode assembly, and the fourth part is covered by the fifth insulating part.

37. The battery cell of claim 36, wherein: A thickness of the fifth insulating part is T9, and 0 38. The battery cell of claim 37, wherein: 0 39. The battery cell of claim 13, wherein: The electrode terminal is an aluminum terminal, and an outer surface of the electrode terminal is subjected to an oxidation process or a nitriding process to obtain the second insulating part.

40. The battery cell of any one of claims 1-5, wherein: The second insulating member includes at least one of an aluminum oxide member, a zirconium oxide member, a magnesium silicate member, an aluminum nitride member, a boron nitride member, a silicon carbide member, and a thermosetting polyimide member.

41. The battery cell of any one of claims 1-5, wherein: The housing includes an end cap and a shell, the shell surrounds to form the accommodation cavity, the end cap covers the opening of the accommodation cavity, and the side wall of the shell and the end cap oppositely arranged form the first side wall.

42. The battery cell of claim 41, wherein: The electrode assembly includes a body and first and second polarized tabs, the body leads out the first tab towards the end of the end cap, the body leads out the second tab towards the end of the first side wall, the first tab is electrically connected with the end cap, and the second tab is electrically connected with the electrode terminal.

43. The battery cell of any one of claims 1-5, wherein: The battery cell is a cylindrical battery cell or a prismatic battery cell.

44. A battery device, comprising: A plurality of battery cells according to any one of claims 1-43 are included.

45. An electrical device, comprising: A battery cell according to any one of claims 1-43 or a battery device according to claim 44 is included.

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