Battery cell, battery, and electric device

Abstract

The application discloses a battery cell, a battery and a power utilization device. The battery cell comprises a shell, an electrode terminal, an electrode assembly and a first insulating piece. The shell has a first wall and a second wall, and the second wall is arranged at the edge of the first wall. The electrode terminal is insulated and mounted on the first wall. The electrode assembly is accommodated in the shell, and the electrode assembly comprises a main body, a first tab and a second tab. The first tab and the second tab have opposite polarities. The main body has a first end face close to the first wall along the thickness direction of the first wall. The first tab and the second tab are arranged on the first end face. The first tab is electrically connected with the electrode terminal, and the second tab is electrically connected with the shell. The first insulating piece is arranged on the outer circumferential surface of the main body. Part of the first insulating piece is located between the first tab and the second wall to insulate and separate the first tab from the second wall. The technical scheme provided by the application can improve the reliability of the battery.

Description

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese patent application 202311186331.4, filed on September 14, 2022, entitled “Battery Cell, Battery and Electrical Device”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of battery technology, and more specifically, to a battery cell, a battery, and an electrical device. Background Technology

[0004] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0005] In the development of battery technology, how to improve battery reliability is a technical problem that urgently needs to be solved. Summary of the Invention

[0006] This application provides a battery cell, a battery, and an electrical device. The technical solution provided by this application can improve the reliability of the battery.

[0007] This application is achieved through the following technical solution:

[0008] In a first aspect, this application provides a battery cell, including a casing, electrode terminals, an electrode assembly, and a first insulating member. The casing has a first wall and a second wall, with the second wall surrounding the edge of the first wall. The electrode terminals are insulatedly mounted to the first wall. The electrode assembly is housed within the casing and includes a main body, a first tab, and a second tab. The first tab and the second tab have opposite polarities. Along the thickness direction of the first wall, the main body has a first end face near the first wall. Both the first tab and the second tab are disposed on the first end face. The first tab is electrically connected to the electrode terminals, and the second tab is electrically connected to the casing. The first insulating member is disposed on the outer peripheral surface of the main body, with a portion of the first insulating member located between the first tab and the second wall to insulate the first tab from the second wall.

[0009] In the above technical solution, by placing both the first and second tabs of the electrode assembly on the same end face (i.e., the first end face) of the main body, it is beneficial to save the space occupied by the electrode assembly in the thickness direction of the first wall, thereby improving the energy density of the battery cell with such an electrode assembly. The battery cell also includes a first insulating member, a portion of which is located between the first tab and the second wall of the casing. This allows the first tab to be insulated from the second wall, reducing the risk of short circuits within the battery cell caused by contact between the first tab and the second wall (i.e., with the battery casing), thus resulting in higher battery reliability.

[0010] According to some embodiments of this application, along the circumference of the main body, the central angle corresponding to the first insulating member is α1, where α1 < 360°.

[0011] In the above technical solution, by setting the central angle α1 corresponding to the first insulating component to be less than 360°, the first insulating component does not need to cover the outer periphery of the main body. With the first insulating component playing the role of insulating and isolating the first electrode tab and the second wall, the material used for the first insulating component is reduced, which saves the manufacturing cost of the battery cell and thus reduces the manufacturing cost of the battery.

[0012] According to some embodiments of this application, along the circumference of the main body, the central angle corresponding to the first insulating member is α1, and the central angle corresponding to the first electrode tab is α2, satisfying α1 > α2.

[0013] In the above technical solution, by setting the central angle α1 corresponding to the first insulating component to be greater than the central angle α2 corresponding to the first tab, the first insulating component can effectively insulate and isolate the first tab and the second wall, improve the creepage distance between the first tab and the second wall, thereby reducing the risk of internal short circuit in the battery cell and thus making the battery have higher reliability.

[0014] According to some embodiments of this application, along the circumference of the main body, the central angle corresponding to the first insulating member is α1, and the central angle corresponding to the second electrode is α3, satisfying α1+α3<360°.

[0015] In the above technical solution, by limiting the sum of the central angle α1 corresponding to the first insulating component and the central angle α2 corresponding to the second electrode to less than 360°, the material used in the first insulating component is reduced while insulating and isolating the first electrode and the second wall, thereby achieving the purpose of saving the manufacturing cost of the battery cell and thus reducing the manufacturing cost of the battery.

[0016] According to some embodiments of this application, the first insulating member does not surround the second electrode tab along the circumferential direction of the main body.

[0017] In the above technical solution, by setting the first insulating member in a position that does not surround the second electrode along the circumference of the main body, the first insulating member can be provided without corresponding to the second electrode while effectively insulating and isolating the first electrode and the second wall. That is, the second electrode can be omitted between the second electrode and the second wall, thereby effectively reducing the material used of the first insulating member and thus reducing the manufacturing cost of the battery.

[0018] According to some embodiments of this application, the battery cell further includes a first adapter and a second insulating member. The first adapter connects a first tab and an electrode terminal. The second insulating member is disposed between the first adapter and the housing to insulatingly isolate the first adapter and the housing.

[0019] In the above technical solution, by setting a first adapter to connect the first tab and the electrode terminal, the connection difficulty between the first tab and the electrode terminal can be reduced, and the manufacturing efficiency of the battery cell can be improved. A second insulating component is provided between the first adapter and the outer casing to insulate and isolate the first adapter and the outer casing, increasing the creepage distance between the first adapter and the outer casing, thereby reducing the risk of internal short circuits in the battery cell and giving the battery higher reliability.

[0020] According to some embodiments of this application, the first insulating member is connected to the main body and the second insulating member.

[0021] In the above technical solution, by setting the first insulating member to be connected to the main body and the second insulating member, the first insulating member can be stably located on the outer peripheral surface of the main body, thereby effectively insulating and isolating the first electrode tab and the second wall, reducing the risk of short circuit inside the battery cell caused by the first electrode tab overlapping with the shell, and thus making the battery have high reliability.

[0022] According to some embodiments of this application, along the thickness direction of the first wall, the second insulating member has a first surface facing the electrode assembly, the first surface being connected to the first tab, and the first insulating member extending beyond the first surface along the direction of the body portion toward the first wall.

[0023] In the above technical solution, by setting the first insulating element to extend beyond the first surface, the creepage distance between the first electrode and the second wall can be effectively increased, the risk of the first electrode and the second wall overlapping can be effectively reduced, thereby reducing the risk of internal short circuit in the battery cell and thus making the battery have high reliability.

[0024] According to some embodiments of this application, along the direction from the main body to the first wall, the dimension of the first insulating member extending beyond the first surface is h1, satisfying h1≥0.5mm.

[0025] In the above technical solution, by setting the dimension h1 of the first insulating member extending beyond the first surface to be greater than or equal to 0.5 mm, the first insulating member can effectively cover the first tab in the direction of the main body pointing towards the first wall, effectively increasing the creepage distance between the first tab and the second wall, effectively reducing the risk of the first tab and the second wall overlapping, thereby reducing the risk of internal short circuit in the battery cell, and thus making the battery have higher reliability.

[0026] According to some embodiments of this application, h1 ≥ 1.5 mm is satisfied.

[0027] In the above technical solution, by setting the dimension h1 of the first insulating member extending beyond the first surface to be greater than or equal to 1.5mm, on the one hand, the connection between the first insulating member and the second insulating member can be made stable, and on the other hand, the first insulating member can effectively cover the first tab in the direction of the main body pointing to the first wall, effectively increasing the creepage distance between the first tab and the second wall, effectively reducing the risk of the first tab and the second wall overlapping, thereby reducing the risk of internal short circuit in the battery cell, and thus making the battery have higher reliability.

[0028] According to some embodiments of this application, the first insulating member extends beyond the first end face in the direction from the first wall toward the main body.

[0029] In the above technical solution, by setting the insulating part to extend beyond the first end face, the creepage distance between the first electrode and the second wall can be effectively increased, the risk of the first electrode and the second wall overlapping can be effectively reduced, thereby reducing the risk of internal short circuit in the battery cell and thus making the battery have high reliability.

[0030] According to some embodiments of this application, the first insulating member extends beyond the first end face by an dimension of h2 along the direction from the first wall to the main body, satisfying h2≥0.5mm.

[0031] In the above technical solution, by setting the dimension h2 of the first insulating member extending beyond the first end face to be greater than or equal to 0.5mm, the first insulating member can effectively cover the first tab in the direction of the first wall pointing towards the main body, effectively increasing the creepage distance between the first tab and the second wall, effectively reducing the risk of the first tab and the second wall overlapping, thereby reducing the risk of internal short circuit in the battery cell, and thus making the battery have higher reliability.

[0032] According to some embodiments of this application, h2 ≥ 1.5 mm is satisfied.

[0033] In the above technical solution, by setting the dimension h2 of the first insulating member extending beyond the first end face to be greater than or equal to 1.5mm, on the one hand, the connection between the first insulating member and the main body can be made stable, and on the other hand, the first insulating member can effectively cover the first tab in the direction of the first wall pointing to the main body, effectively increasing the creepage distance between the first tab and the second wall, effectively reducing the risk of the first tab and the second wall overlapping, thereby reducing the risk of internal short circuit in the battery cell, and thus making the battery have higher reliability.

[0034] According to some embodiments of this application, the thickness of the first insulating element is T, which satisfies T≥30μm.

[0035] In the above technical solution, by setting the thickness T of the first insulating component to be greater than or equal to 30μm, the risk of the first insulating component breaking or being punctured can be reduced, the insulation and isolation effect of the first insulating component can be improved, and the risk of short circuit inside the battery cell due to the overlap of the first tab and the second wall can be reduced, so that the battery has high reliability.

[0036] According to some embodiments of this application, the electrode assembly is a wound electrode assembly, and the first electrode tab includes a plurality of first sub-electrodes, each of which has the same size in the winding direction of the electrode assembly. Alternatively, along the direction from the inner ring to the outer ring of the electrode assembly, the size of the plurality of first sub-electrodes gradually increases in the winding direction of the electrode assembly.

[0037] In some embodiments of the above technical solutions, by setting the dimensions of each first sub-tab to the same size in the winding direction of the electrode assembly, the processing difficulty of the first sub-tab can be reduced (for example, when die-cutting the tab, the die-cutting size of each first sub-tab is the same, so the die-cutting efficiency is high), thereby improving the manufacturing efficiency of the battery. In some embodiments, by setting the dimensions of multiple first sub-tabs to gradually increase in the winding direction of the electrode assembly along the direction from the inner ring to the outer ring, the first tab can fully utilize the internal space of the casing, giving the first tab a larger area to improve the current-carrying capacity between the first tab and the electrode terminals, thus giving the battery better charge and discharge performance.

[0038] According to some embodiments of this application, the electrode assembly is a wound electrode assembly, and the second tab includes a plurality of second sub-tabs, each of which has the same size in the winding direction of the electrode assembly. Alternatively, along the direction from the inner ring to the outer ring of the electrode assembly, the size of the plurality of second sub-tabs gradually increases in the winding direction of the electrode assembly.

[0039] In the above technical solutions, in some embodiments, by setting the size of each second sub-tab to the same size in the winding direction of the electrode assembly, the processing difficulty of the second sub-tab can be reduced (for example, when die-cutting the tab, the die-cutting size of each second sub-tab is the same, so the die-cutting efficiency is high), and the manufacturing efficiency of the battery can be improved. In some embodiments, by setting the size of multiple second sub-tabs to gradually increase in the winding direction of the electrode assembly along the direction from the inner ring to the outer ring, the second tabs can make full use of the internal space of the casing, so that the second tabs have a larger area to improve the current carrying capacity between the second tabs and the casing, and the battery has better charge and discharge performance.

[0040] According to some embodiments of this application, the first electrode has a second surface facing the first wall, and the second surface is fan-shaped.

[0041] In the above technical solution, by setting the second surface of the first tab to a fan-shaped structure, the first tab can make full use of the internal space of the casing, so that the first tab has a larger area to improve the overcurrent capacity between the first tab and the electrode terminal, and thus the battery has better charge and discharge performance.

[0042] According to some embodiments of this application, along the circumferential direction of the main body, the second surface has a first edge and a second edge that are far apart from each other, and the angle between the first edge and the second edge is β1, where 0 < β1 ≤ 270°.

[0043] In the above technical solution, by setting the angle β1 formed between the first edge and the second edge of the first electrode tab to be less than or equal to 270 degrees, the central angle of the second surface of the fan-shaped first electrode tab is less than or equal to 270 degrees, so as to alleviate the phenomenon that the first electrode tab and the second electrode tab are easy to overlap due to the excessive space occupied by the first electrode tab, thereby making the battery have high reliability.

[0044] According to some embodiments of this application, the second electrode has a third surface facing the first wall, and the third surface is fan-shaped.

[0045] In the above technical solution, by setting the third surface of the second tab as a fan-shaped structure, the second tab can make full use of the internal space of the casing, so that the second tab has a larger area to improve the current flow capacity between the second tab and the casing, and the battery has better charge and discharge performance.

[0046] According to some embodiments of this application, along the circumferential direction of the main body, the third surface has a third edge and a fourth edge that are far apart from each other, and the angle between the third edge and the fourth edge is β2, where 0 < β2 ≤ 180°.

[0047] In the above technical solution, by setting the angle β2 formed between the third and fourth edges of the second electrode to be less than or equal to 180 degrees, the central angle of the third surface of the fan-shaped second electrode is less than or equal to 180 degrees, so as to alleviate the phenomenon that the first electrode and the second electrode are prone to short circuit due to the excessive space occupied by the second electrode, thereby making the battery have high reliability.

[0048] According to some embodiments of this application, the electrode assembly includes a first electrode and a second electrode, and the electrode assembly is a wound electrode assembly. The first electrode includes a plurality of first sub-electrode tabs, which form a first electrode tab. The innermost n1 turns of the first electrode do not have first sub-electrode tabs, where n1 ≥ 1. And / or, the second electrode includes a plurality of second sub-electrode tabs, which form a second electrode tab. The innermost n2 turns of the second electrode do not have second electrode tabs, where n2 ≥ 1.

[0049] In the above technical solution, by not setting the first sub-tab on the first electrode plate of the innermost n1 turns, the first tab and the second tab can be effectively spaced apart, thereby reducing the risk of short circuit between the first tab and the second tab and improving battery reliability. Similarly, by not setting the second sub-tab on the second electrode plate of the innermost n2 turns, the second tab and the first tab can be effectively spaced apart, thereby reducing the risk of short circuit between the second tab and the first tab and improving battery reliability.

[0050] According to some embodiments of this application, the electrode assembly includes a first electrode and a second electrode, and the electrode assembly is a wound electrode assembly. The first electrode includes a plurality of first sub-electrode tabs, which form a first electrode tab. The outermost m1 turns of the first electrode do not have first sub-electrode tabs, where m1 ≥ 1. And / or, the second electrode includes a plurality of second sub-electrode tabs, which form a second electrode tab. The outermost m2 turns of the second electrode do not have second electrode tabs, where m2 ≥ 1.

[0051] In the above technical solution, by not providing a first sub-tab on the first electrode plate of the outermost m1 ring, the first tab and the second wall can be effectively spaced apart, thereby reducing the risk of short circuit between the first tab and the second wall and improving battery reliability. Similarly, by not providing a second sub-tab on the second electrode plate of the outermost m2 ring, the second tab and the first wall tab can be effectively spaced apart, thereby reducing the risk of damage to the second tab due to interference between the second tab and the second wall when the electrode assembly is placed into the casing, and further improving battery reliability.

[0052] Secondly, some embodiments of this application also provide a battery, which includes the battery cell provided in the first aspect.

[0053] Thirdly, some embodiments of this application also provide an electrical device, which includes a battery cell as provided in the first aspect, the battery cell being used to provide electrical energy.

[0054] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0055] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0056] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0057] Figure 2 Exploded perspective views of batteries provided in some embodiments of this application;

[0058] Figure 3 These are perspective views of individual battery cells in some embodiments of this application;

[0059] Figure 4 This is an exploded perspective view of a battery cell in some embodiments of this application;

[0060] Figure 5 This is a schematic diagram of the electrode assembly and the first insulating element in some embodiments of this application;

[0061] Figure 6 This is a top view of the electrode assembly and the first insulating element in some embodiments of this application;

[0062] Figure 7 This is a top view of the electrode assembly and the first insulating element in some embodiments of this application;

[0063] Figure 8 This is a perspective view of the electrode terminals, the first insulating member, and the second insulating member in some embodiments of this application;

[0064] Figure 9 This is a schematic diagram of the internal structure of a battery cell in some embodiments of this application;

[0065] Figure 10 This is a top view of the electrode assembly in some other embodiments of this application;

[0066] Figure 11 This is a top view of the electrode assembly in some other embodiments of this application.

[0067] Icons: 100-Battery; 10-Battery cell; 11-Casing; 110-First wall; 111-Second wall; 112-Electrode terminal; 113-Base plate; 12-Electrode assembly; 120-Main body; 1200-First end face; 121-First tab; 1210-First sub-tab; 1211-Second surface; 12110-First edge; 12111-Second edge; 122-Second tab; 1220-Second sub-tab; 1221-Third surface; 12 210 - Third edge; 12211 - Fourth edge; 123 - Central through hole; 13 - First insulator; 14 - First adapter; 15 - Second adapter; 16 - Second insulator; 160 - First surface; 161 - Insulator body; 162 - Separator; 17 - Insulating film; x - Thickness direction of the first wall; y - Circumferential direction of the main body; 20 - Box; 21 - First box body; 22 - Second box body; 1000 - Vehicle; 200 - Controller; 300 - Motor. Detailed Implementation

[0068] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0069] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0070] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0071] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0072] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0073] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0074] In this application, "multiple" means two or more (including two).

[0075] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0076] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0077] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0078] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0079] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0080] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0081] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxide may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM) 622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.85 Co 0.15 Al 0.05At least one of O2 and its modified compounds.

[0082] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, lithium source material, potassium metal, or sodium metal may also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0083] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0084] As an example, the negative electrode current collector can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be silver-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium, etc. Foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0085] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0086] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0087] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as battery negative electrode active materials may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0088] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0089] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0090] In some embodiments, the separator is a separator membrane. The separator membrane can be of various types, and any known porous separator membrane with good chemical and mechanical stability can be selected.

[0091] As an example, the material of the separator may include at least one of glass fiber, nonwoven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film. When the separator is a multi-layer composite film, the materials of each layer may be the same or different. The separator may be a separate component located between the positive and negative electrodes, or it may be attached to the surfaces of the positive and negative electrodes.

[0092] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0093] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel-like, or solid. Liquid electrolytes include electrolyte salts and solvents.

[0094] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0095] In some embodiments, the solvent may include at least one selected from ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more selected from ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0096] Among them, the gel electrolyte includes a polymer as the electrolyte backbone network, combined with an ionic liquid - lithium salt.

[0097] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0098] As an example, polymer solid electrolytes can be polyether (polyoxyethylene), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids-lithium salts, cellulose, etc.

[0099] As an example, inorganic solid electrolytes may include one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphate sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0100] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0101] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0102] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0103] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0104] As an example, a single battery cell can be a cylindrical battery cell or a prismatic battery cell.

[0105] The battery mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity.

[0106] In some embodiments, the battery can be a battery module, and when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0107] In some embodiments, the battery can be a battery pack, which includes a housing and individual battery cells, with the individual battery cells or battery modules housed within the housing.

[0108] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0109] In some embodiments, the battery can be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0110] Batteries have outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide applicability, and low self-discharge coefficient, making them an important component of the current development of new energy.

[0111] A battery cell typically includes a casing and an electrode assembly housed within the casing. The electrode assembly includes a main body and tabs disposed on the main body. The tabs are used to output or input electrical energy to the electrode assembly. The tabs include a first tab and a second tab with opposite polarities. The first tab is typically connected to an electrode terminal that is insulated and mounted on the casing, and the second tab is typically electrically connected to the casing.

[0112] In the development of battery technology, improving battery reliability is a pressing technical problem that needs to be solved. Currently, the outer casing is made of metal, and the first tab is prone to overlap with the casing, leading to a higher risk of internal short circuits in the battery cells, thus resulting in low battery reliability.

[0113] In view of this, to improve the problem of the tabs easily overlapping with the casing, leading to internal short circuits in the battery cell and resulting in low battery reliability, some embodiments of this application provide a battery cell including a casing, electrode terminals, an electrode assembly, and a first insulating member. The casing has a first wall and a second wall, with the second wall surrounding the edge of the first wall. The electrode terminals are insulated and mounted on the first wall. The electrode assembly is housed within the casing and includes a main body, a first tab, and a second tab. The first tab and the second tab have opposite polarities. Along the thickness direction of the first wall, the main body has a first end face near the first wall. Both the first tab and the second tab are disposed on the first end face. The first tab is electrically connected to the electrode terminal, and the second tab is electrically connected to the casing. The first insulating member is disposed on the outer peripheral surface of the main body, with a portion of the first insulating member located between the first tab and the second wall to insulate the first tab from the second wall.

[0114] In this type of battery cell, by placing both the first and second tabs of the electrode assembly on the same end face (i.e., the first end face) of the main body, it is beneficial to save space occupied by the electrode assembly, thereby increasing the energy density of the battery cell with this electrode assembly. The battery cell also includes a first insulating member, part of which is located between the first tab and the second wall of the casing. This allows the first tab to be insulated from the second wall, reducing the risk of short circuits within the battery cell caused by contact between the first tab and the second wall (i.e., with the battery casing), thus resulting in higher battery reliability.

[0115] The electrode assembly disclosed in this application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system for such an electrical device can be composed of battery cells and batteries as disclosed in this application. This helps to improve the problem of low battery reliability caused by internal short circuits in battery cells due to the contact between the electrode tabs and the casing.

[0116] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0117] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0118] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery 100 is disposed inside the vehicle 1000. The battery 100 can be disposed at the bottom, front, or rear of the vehicle 1000. The battery 100 can be used to power the vehicle 1000; for example, the battery 100 can serve as the operating power source or general power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 controls the battery 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0119] In some embodiments of this application, the battery 100 can not only serve as the operating power or power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0120] Please refer to Figure 2 and Figure 3 , Figure 2 This is an exploded perspective view of a battery 100 provided in some embodiments of this application. The battery 100 includes a housing 20 and a battery cell 10, which is housed within the housing 20.

[0121] The housing 20 provides assembly space for the battery cell 10, and can adopt various structures. In some embodiments, the housing 20 may include a first housing body 21 and a second housing body 22, which overlap each other, and together define an assembly space for accommodating the battery cell 10. The second housing body 22 may be a hollow structure open at one end, and the first housing body 21 may be a plate-like structure, with the first housing body 21 covering the open side of the second housing body 22 so that the first housing body 21 and the second housing body 22 together define the assembly space; alternatively, the first housing body 21 and the second housing body 22 may both be hollow structures open on one side, with the open side of the first housing body 21 covering the open side of the second housing body 22.

[0122] Of course, the box 20 formed by the first box body 21 and the second box body 22 can be of various shapes, such as a cylinder, a cuboid, or a cube. For example, in... Figure 2 In the middle, the shape of box 20 is a cuboid.

[0123] In battery 100, there can be one or more battery cells 10 disposed within housing 20. When there are multiple battery cells 10 disposed within housing 20, they can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 10 are connected in both series and parallel configurations. Multiple battery cells 10 can be directly connected in series, in parallel, or in a mixed configuration, and then the entire assembly of multiple battery cells 10 is housed within housing 20. Alternatively, battery 100 can also be composed of multiple battery cells 10 first connected in series, in parallel, or in a mixed configuration to form a battery module, and then multiple battery modules are connected in series, in parallel, or in a mixed configuration to form a whole, which is then housed within housing 20.

[0124] In some embodiments, the battery 100 may also include other structures. For example, the battery 100 may also include a busbar for connecting multiple battery cells 10 to achieve electrical connection between the multiple battery cells 10.

[0125] Each battery cell 10 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 10 can be cylindrical, prismatic, or other shapes. For example, in... Figure 3 In the middle, the battery cell 10 has a cylindrical structure.

[0126] According to some embodiments of this application, please refer to Figures 3-5 , Figure 3 This is a perspective view of a battery cell 10 in some embodiments of this application. Figure 4 This is an exploded perspective view of the battery cell 10 in some embodiments of this application. Figure 5This is a schematic diagram of the electrode assembly 12 and the first insulating member 13 in some embodiments of this application.

[0127] The battery cell 10 includes a housing 11, electrode terminals 112, an electrode assembly 12, and a first insulating member 13. The housing 11 has a first wall 110 and a second wall 111, with the second wall 111 surrounding the edge of the first wall 110. The electrode terminals 112 are insulatedly mounted to the first wall 110. The electrode assembly 12 is housed within the housing 11 and includes a main body 120, a first tab 121, and a second tab 122. The first tab 121 and the second tab 122 have opposite polarities. Along the thickness direction x of the first wall, the main body 120 has a first end face 1200 near the first wall 110. Both the first tab 121 and the second tab 122 are disposed on the first end face 1200. The first tab 121 is electrically connected to the electrode terminal 112, and the second tab 122 is electrically connected to the housing 11. The first insulating member 13 is disposed on the outer peripheral surface of the main body 120, and a portion of the first insulating member 13 is located between the first electrode 121 and the second wall 111 so that the first electrode 121 and the second wall 111 are mutually insulated and isolated.

[0128] The housing 11 is a component for housing the electrode assembly 12. The housing 11 can also be used to house an electrolyte, such as an electrolyte solution. See also... Figure 4 In some embodiments, the housing 11 includes a shell and an end cap. The interior of the shell has a receiving cavity for accommodating the electrode assembly 12. The shell has an opening communicating with the receiving cavity. The end cap closes to the opening of the shell and forms a sealed connection to create a sealed space for accommodating the electrode assembly 12 and the electrolyte. Optionally, the housing 11 may also include a base plate 113. Openings are formed at both ends of the shell, one of which is closed by the end cap, and the other opening is closed by the base plate 113.

[0129] In some embodiments, the material of the housing 11 can be metal or a combination of metal and non-metal. For example, the housing 11 can be made of metal, such as aluminum, copper, iron, aluminum, steel or aluminum alloy. Alternatively, some parts of the housing 11 can be made of metal, while the rest can be made of non-metal. For example, the end caps of the housing 11 can be made of metal, while the shell or other parts of the housing 11 can be made of non-metallic materials.

[0130] In some embodiments, when assembling the battery cell 10, the electrode assembly 12 can be placed into the housing first, and electrolyte can be filled into the housing. Then, the end cap can be closed onto the opening of the housing to complete the assembly of the battery cell 10. Alternatively, in some embodiments, when assembling the battery cell 10, the electrode assembly 12 can be placed into the housing first, and then the end cap can be closed onto the opening of the housing. Electrolyte can then be filled into the housing through the injection hole on the end cap, and then the injection hole can be closed to complete the assembly of the battery cell 10.

[0131] The outer casing 11 can be of various shapes, such as a cylinder or a prism. The shape of the outer casing 11 can be determined according to the specific shape of the electrode assembly 12. For example, if the electrode assembly 12 is a cylindrical structure, then a cylindrical outer casing 11 can be selected.

[0132] The first wall 110 is a partial structure of the outer casing 11. The first wall 110 may have an electrode terminal 112 insulatedly mounted on it. The electrode terminal 112 is used to connect to the first tab 121 of the electrode assembly 12. The first wall 110 may be made of a conductive material, such as a metal, for example, aluminum, copper, iron, aluminum, steel, or aluminum alloy. In some embodiments, the first wall 110 may be electrically connected to the second tab 122 of the electrode assembly 12. In some embodiments, the first wall 110 may be an end cap of the outer casing 11. The second wall 111 is a portion surrounding the edge of the first wall 110. In some embodiments, the first wall 110 is an end cap of the outer casing 11, and the second wall 111 may be the shell of the outer casing 11.

[0133] In some embodiments, the first wall 110 may be connected to the second wall 111 by welding, bonding, snap-fitting, or other connection methods. In some embodiments, the first wall 110 and the second wall 111 may be integrally formed.

[0134] Electrode terminal 112 is an insulated component mounted on the first wall 110. Electrode terminal 112 is used to connect to the first tab 121 of electrode assembly 12, so that current flows into or out of the second tab 122 through electrode terminal 112. In some embodiments, electrode terminal 112 is made of a metallic material, such as aluminum, copper, iron, steel, alloy or composite metal.

[0135] In some embodiments, the electrode terminal 112 can be mounted on the first wall 110 by an insulating structure. For example, the first wall 110 has a through hole, and the peripheral wall of the electrode terminal 112 is fitted with an insulating structure, which is disposed between the first wall 110 and the electrode terminal 112.

[0136] It should be noted that the electrode assembly 12 is the component in the battery cell 10 where the electrochemical reaction occurs. The structure of the electrode assembly 12 can be varied. For example, the electrode assembly 12 can be a wound structure formed by winding a positive electrode, a separator, and a negative electrode, and the main body 120 of the electrode assembly 12 is cylindrical. For example, the separator is a separator membrane, and the main material of the separator membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride.

[0137] The main body 120 is the area where the electrode assembly 12 undergoes a chemical reaction within the battery cell 10. The main body 120 is a structure formed by winding the area where the positive electrode sheet is coated with a positive active material layer, the separator, and the area where the negative electrode sheet is coated with a negative active material layer. It mainly relies on the movement of metal ions between the positive and negative electrode sheets with opposite polarities to work.

[0138] In some embodiments, the thickness direction x of the first wall may be parallel to the height direction of the electrode assembly 12. The first end face 1200 may be the end face of the main body 120 facing the first wall 110, for example, the first end face 1200 may be the top surface of the main body 120.

[0139] The first electrode 121 and the second electrode 122 are both disposed at one end of the main body 120. That is, the first electrode 121 and the second electrode 122 are disposed at the same end of the main body 120 in the thickness direction x of the first wall, and are located at the end of the main body 120 facing the first wall 110.

[0140] The first tab 121 and the second tab 122 are used as the positive and negative electrodes of the output or input electrode assembly 12, respectively. If the first tab 121 is used as the positive electrode of the input or output electrode assembly 12, then the first tab 121 is a component formed by stacking and connecting the regions of the positive electrode sheet that are not coated with a positive active material layer. Correspondingly, if the second tab 122 is used as the negative electrode of the output or input electrode assembly 12, then the second tab 122 is a component formed by stacking and connecting the regions of the negative electrode sheet that are not coated with a negative active material layer. If the first tab 121 is used as the negative electrode of the output or input electrode assembly 12, then the first tab 121 is a component formed by stacking and connecting the regions of the negative electrode sheet that are not coated with a negative active material layer. Correspondingly, if the second tab 122 is used as the positive electrode of the input or output electrode assembly 12, then the second tab 122 is a component formed by stacking and connecting the regions of the positive electrode sheet that are not coated with a positive active material layer. For example, in the embodiments of this application, the first tab 121 is used as the positive electrode of the output or input electrode assembly 12, and the second tab 122 is used as the negative electrode of the output or input electrode assembly 12.

[0141] "The first tab 121 is electrically connected to the electrode terminal 112" can be understood as the first tab 121 being directly or indirectly connected to the electrode terminal 112 to achieve an electrical connection between the first tab 121 and the electrode terminal 112. For example, in some embodiments, the first tab 121 is directly welded to the electrode terminal 112; in some embodiments, the first tab 121 is connected to the electrode terminal 112 through the first adapter 14, wherein the first tab 121 and the electrode terminal 112 can be respectively welded to the first adapter 14.

[0142] "The second tab 122 is electrically connected to the outer casing 11" can be understood as the second tab 122 being directly or indirectly connected to the outer casing 11 to achieve an electrical connection between the second tab 122 and the outer casing 11. For example, in some embodiments, the second tab 122 is directly connected to the first wall 110 of the outer casing 11; in some embodiments, the second tab 122 is connected to the second wall 111 of the outer casing 11; in some embodiments, the second tab 122 is connected to the outer casing 11 via a second adapter 15. For example, the second tab 122 and the first wall 110 can be welded to the second adapter 15 respectively.

[0143] A first insulating member 13 is provided on the outer peripheral surface of the main body 120, and a portion of the first insulating member 13 is located between the first tab 121 and the second wall 111. The first insulating member 13 has insulating properties and is used to insulate and isolate the first tab 121 and the second wall 111 to reduce the risk of internal short circuit of the battery cell 10 caused by the first tab 121 and the second wall 111 overlapping. In some embodiments, the first insulating member 13 may be sheet-like, plate-like, or ring-like. In some embodiments, the first insulating member 13 may be made of rubber, silicone, or plastic. In some embodiments, the first insulating member 13 is made of insulating material, such as polypropylene, polyethylene, or other materials with insulating properties.

[0144] The phrase "a portion of the first insulating member 13 is located between the first electrode tab 121 and the second wall 111" can be understood as follows: a portion of the first insulating member 13 is connected to the outer peripheral surface of the main body 120, and the first insulating member 13 is located between the first electrode tab 121 and the second wall 111 to insulate and isolate the first electrode tab 121 and the second wall 111; it can also be understood as follows: the first insulating member 13 is disposed on the outer periphery of the electrode assembly 12, with a portion located between the first electrode tab 121 and the second wall 111, to insulate and isolate the first electrode tab 121 and the second wall 111. See, for example... Figure 8 A portion of the first insulating member 13 is connected to the main body 120. A portion of the first insulating member 13 is located between the first tab 121 and the second wall 111 to insulate and isolate the first tab 121 and the second wall 111. The remaining portion of the first insulating member 13 is disposed on other structures of the battery cell 10.

[0145] In the above technical solution, by placing the first tab 121 and the second tab 122 of the electrode assembly 12 on the same end face (i.e., the first end face 1200) of the main body 120, it is beneficial to save the space occupied by the electrode assembly 12 in the thickness direction x of the first wall, thereby improving the energy density of the battery cell 10 having such an electrode assembly 12. The battery cell 10 also includes a first insulating member 13, a portion of which is located between the first tab 121 and the second wall 111 of the casing 11, so that the first tab 121 is insulated from the second wall 111. This reduces the risk of short circuits inside the battery cell 10 caused by the first tab 121 contacting the second wall 111 (i.e., the casing 11 of the battery 100), thus giving the battery 100 higher reliability.

[0146] According to some embodiments of this application, please refer to Figure 5 and Figure 6 , Figure 6 This is a top view of the electrode assembly 12 and the first insulating member 13 in some embodiments of this application. Along the circumferential direction y of the main body, the central angle corresponding to the first insulating member 13 is α1, where α1 < 360°.

[0147] In some embodiments, the first insulating member 13 is disposed on the outer periphery of the main body portion 120 and extends along the circumferential direction y of the main body portion. "Along the circumferential direction y of the main body portion, the central angle corresponding to the first insulating member 13 is α1, α1 < 360°" can be understood as the first insulating member 13 not covering the entire circumferential direction y of the main body portion, that is, the first insulating member 13 covers the portion of the main body portion along the circumferential direction y rather than the entire circumferential direction; it can also be understood as the first insulating member 13 having two mutually distant edges along the axial direction of the main body portion 120, with an angle α1 between the two edges.

[0148] In some embodiments, the central angle α1 corresponding to the first insulating member 13 can be an angle value less than 360°, for example, it can be equal to 1°, 2°…44°, 45°, 46°…90°, 91°, 92°…179°, 180°…358°, 359° or any value between two adjacent values.

[0149] In some embodiments, the first tab 121 and the second tab 122 can be spaced apart along the circumferential direction y of the main body. For example, the surface of the first tab 121 facing the first wall 110 is fan-shaped, and this fan shape is co-centered with the first end face 1200. Due to the presence of the second tab 122, the central angle corresponding to the first surface 160 is less than 360°. The first insulating member 13 is used to insulate and isolate the first tab 121 and the second wall 111. The first insulating member 13 is set corresponding to the central angle of the first tab 121. Due to the presence of the second tab 122, the first insulating member 13 does not need to be set in a circle along the circumferential direction y of the main body, that is, the central angle α1 corresponding to the first insulating member 13 can be an angle value less than 360°.

[0150] In the above technical solution, by setting the central angle α1 corresponding to the first insulating member 13 to be less than 360°, the first insulating member 13 does not need to cover the outer periphery of the main body 120. With the first insulating member 13 playing the role of insulating and isolating the first tab 121 and the second wall 111, the material used of the first insulating member 13 is reduced, which saves the manufacturing cost of the battery cell 10 and thus reduces the manufacturing cost of the battery 100.

[0151] In some other embodiments, the central angle α1 corresponding to the first insulating member 13 along the circumferential direction y of the main body portion can be greater than or equal to 360°. For example, the first insulating member 13 can be disposed around the outer periphery of the main body portion 120 at least once.

[0152] According to some embodiments of this application, please refer to Figure 6 Along the circumferential direction y of the main body, the central angle corresponding to the first insulating member 13 is α1, and the central angle corresponding to the first electrode tab 121 is α2, satisfying α1>α2.

[0153] In some embodiments, the first insulating member 13 is disposed on the outer periphery of the main body portion 120 and extends along the circumferential direction y of the main body portion. "Along the circumferential direction y of the main body portion, the central angle corresponding to the first insulating member 13 is α1; it can also be understood that along the axial direction of the main body portion 120, the first insulating member 13 has two mutually distant edges, and the angle between the two edges is α1.

[0154] Along the circumferential direction y of the main body, the central angle corresponding to the first tab 121 is α2. This can be because the first tab 121 has two mutually distant edges along the circumferential direction y of the main body, and the angle between the two edges is α2. For example, the first tab 121 has a second surface 1211 facing the first wall 110. The second surface 1211 is fan-shaped, and along the circumferential direction y of the main body, the second surface 1211 has a first edge 12110 and a second edge 12111 that are mutually distant, and the angle between the first edge 12110 and the second edge 12111 is α2.

[0155] "α1 > α2" can be understood as follows: the central angle α1 corresponding to the first insulating member 13 is greater than the central angle α2 corresponding to the first tab 121. That is, in the circumferential direction y of the main body, the first insulating member 13 can completely cover the first tab 121. In other words, in the circumferential direction y of the main body, the two mutually distant ends of the first insulating member 13 exceed the two mutually distant ends of the first tab 121. Alternatively, it can be understood as follows: in the circumferential direction y of the main body, the size of the first insulating member 13 is larger than the size of the first tab 121, so that the first insulating member 13 can effectively insulate and isolate the first tab 121 and the second wall 111.

[0156] For example, in some embodiments, the central angle α1 corresponding to the first insulating member 13 can be 160°, and the central angle α2 corresponding to the first tab 121 can be 155°; the central angle α1 corresponding to the first insulating member 13 can be 150°, and the central angle α2 corresponding to the first tab 121 can be 130°; the central angle α1 corresponding to the first insulating member 13 can be 280°, and the central angle α2 corresponding to the first tab 121 can be 270°.

[0157] In the above technical solution, by setting the central angle α1 corresponding to the first insulating member 13 to be greater than the central angle α2 corresponding to the first tab 121, the first insulating member 13 can effectively insulate and isolate the first tab 121 and the second wall 111, improve the creepage distance between the first tab 121 and the second wall 111, thereby reducing the risk of internal short circuit in the battery cell 10 and thus making the battery 100 have higher reliability.

[0158] According to some embodiments of this application, please refer to Figure 6 Along the circumferential direction y of the main body, the central angle corresponding to the first insulating member 13 is α1, and the central angle corresponding to the second electrode 122 is α3, satisfying α1+α3<360°.

[0159] In some embodiments, the first insulating member 13 is disposed on the outer periphery of the main body portion 120 and extends along the circumferential direction y of the main body portion. "Along the circumferential direction y of the main body portion, the central angle corresponding to the first insulating member 13 is α1; it can also be understood that along the axial direction of the main body portion 120, the first insulating member 13 has two mutually distant edges, and the angle between the two edges is α1.

[0160] Along the circumferential direction y of the main body, the central angle corresponding to the second tab 122 is α3. This can be because the second tab 122 has two mutually distant edges along the circumferential direction y of the main body, and the angle between the two edges is α3. For example, the second tab 122 has a third surface 1221 facing the first wall 110. The third surface 1221 is fan-shaped, and along the circumferential direction y of the main body, the third surface 1221 has a mutually distant third edge 12210 and a fourth edge 12211, and the angle between the third edge 12210 and the fourth edge 12211 is α3.

[0161] "α1+α3<360°" can be understood as the sum of the central angle of the first insulating member 13 and the central angle of the second pole tab 122 being less than 360°. In other words, it can be understood that under the condition that the first insulating member 13 insulates and isolates the first pole tab 121 and the second wall 111, a gap is formed between the first insulating member 13 and the second pole tab 122 in the circumferential y direction of the main body.

[0162] For example, in some embodiments, the central angle of the second tab 122 can be 150°, the central angle of the first tab 121 can be 120°, and the central angle of the first insulator 13 can be 130°; the central angle of the second tab 122 can be 180°, the central angle of the first tab 121 can be 170°, and the central angle of the first insulator 13 can be 175°.

[0163] In the above technical solution, by limiting the sum of the central angle α1 corresponding to the first insulating member 13 and the central angle α2 corresponding to the second tab 122 to less than 360°, the material used of the first insulating member 13 is reduced while insulating and isolating the first tab 121 and the second wall 111, thereby achieving the purpose of saving the manufacturing cost of the battery cell 10, and thus reducing the manufacturing cost of the battery 100.

[0164] According to some embodiments of this application, please refer to Figure 7 , Figure 7 This is a top view of the electrode assembly 12 and the first insulating member 13 in some embodiments of this application. Along the circumferential direction y of the main body, the first insulating member 13 does not surround the second electrode tab 122.

[0165] In some embodiments, "the first insulating member 13 does not surround the second tab 122 along the circumferential y-direction of the main body" can be understood as the second tab 122 not being provided between the second tab 122 and the second wall 111. In some embodiments, it can also be understood that along any ray direction emanating from and perpendicular to the central axis of the main body 120, the orthographic projection of the first insulating member 13 and the orthographic projection of the second tab 122 do not overlap.

[0166] "Any ray direction emanating from and perpendicular to the central axis of the main body 120" can be understood as a ray direction emanating outward from the central axis of the main body 120 and perpendicular to the central axis of the main body 120, for example, in... Figure 7 The diagram shows two rays, N1 and N2, that emanate in different directions and conform to the description of "any ray direction emitted from and perpendicular to the central axis of the main body 120". Exemplarily, in some embodiments where the main body 120 is cylindrical, the aforementioned "any ray direction emitted from and perpendicular to the central axis of the main body 120" is a direction parallel to the radial direction of the first end face 1200 of the main body 120 and with a single emission direction.

[0167] The phrase "the orthographic projection of the first insulating member 13 and the orthographic projection of the second tab 122 do not overlap along any ray direction emanating from and perpendicular to the central axis of the main body 120" can be understood as meaning that, in a line of sight parallel to this arbitrary ray direction, only one of the first insulating member 13 and the second tab 122 can be seen. For example, if one were to stand at the center of the first end face 1200 and observe and see through it, only one of the first insulating member 13 and the second tab 122 could be seen through the perspective; the two cannot be seen simultaneously.

[0168] For example, see Figure 7 In some embodiments, the first end face 1200 is circular, and the surfaces of the first tab 121 and the second tab 122 are both fan-shaped, and both are coaxially arranged with the first end face 1200. The first insulating member 13 is an arc-shaped sheet structure disposed on the outer periphery of the main body 120, and the first insulating member 13 can cover the first tab 121 but not the second tab 122.

[0169] In the above technical solution, by setting the first insulating member 13 in a position that does not surround the second tab 122 along the circumferential direction y of the main body, the first insulating member 13 can be provided without corresponding to the second tab 122 under the condition of effectively insulating and isolating the first tab 121 and the second wall 111. That is, the second tab 122 can be omitted between the second tab 122 and the second wall 111, thereby effectively reducing the material used of the first insulating member 13 and thus reducing the manufacturing cost of the battery 100.

[0170] According to some embodiments of this application, please refer to Figure 4 , Figure 8 as well as Figure 9 . Figure 8 This is a perspective view of the electrode terminal 112, the first insulating member 13, and the second insulating member 16 in some embodiments of this application. Figure 9This is a schematic diagram of the internal structure of a partial battery cell 10 in some embodiments of this application.

[0171] The battery cell 10 also includes a first adapter 14 and a second adapter 15. The first adapter 14 connects the first tab 121 and the electrode terminal 112. A second insulating member 16 is disposed between the first adapter 14 and the housing 11 to insulate and isolate the first adapter 14 and the housing 11.

[0172] The first adapter 14 is a component disposed between the first tab 121 and the electrode terminal 112. The first adapter 14 is made of a conductive material, such as aluminum, copper, iron, steel, or aluminum alloy. The material of the first adapter 14 can be the same as that of the first tab 121. The material of the first adapter 14 can be the same as that of the electrode terminal 112.

[0173] The connection between the first adapter 14 and the first electrode tab 121 includes, but is not limited to, welding, bonding, snap-fitting, or other connection methods such as connecting through other connecting components. The connection between the first adapter 14 and the electrode terminal 112 includes, but is not limited to, welding, bonding, snap-fitting, or other connection methods such as connecting through other connecting components.

[0174] The second insulating member 16 is disposed between the first adapter 14 and the housing 11. The second insulating member 16 has insulating properties and can insulate and isolate the housing 11 and the first adapter 14. In some embodiments, the second insulating member 16 may be sheet-like, plate-like, or ring-like. In some embodiments, the second insulating member 16 may be made of rubber, silicone, or plastic. In some embodiments, the second insulating member 16 is made of insulating material, such as polypropylene, polyethylene, or other materials with insulating properties.

[0175] In some embodiments, the second insulating member 16 can insulate the second adapter 15 from the first wall 110 and the second wall 111. In some embodiments, the second insulating member 16 can be the lower plastic of the battery cell 10. Exemplarily, the battery cell 10 also includes the second adapter 15, which connects the second tab 122 and the first wall 110. The second insulating member 16 includes an insulating member body 161 and a partition strip 162. The insulating member body 161 is annular and disposed on the first end face 1200. The first tab 121 and the second tab 122 can support the lower surface of the insulating member body 161 (in some embodiments, the insulating member body 161 can be supported on the first end face 1200, and the first tab 121 and the second tab 122 are located inside the insulating member body 161). The upper surface of the insulating member body 161 faces the first wall 110. The partition strip 162 is disposed inside the insulating member body 161, dividing the internal space of the insulating member body 161 into two subspaces. One subspace accommodates the first adapter 14, and the other subspace accommodates the second adapter 15. Along the thickness direction x of the first wall, the upper surface of the insulating member body 161 is closer to the first wall 110 than the first adapter 14. The functions of the second insulating member 16 include insulating and isolating the first adapter 14 and the second adapter 15, insulating and isolating the first adapter 14 and the first wall 110, and insulating and isolating the first adapter 14 and the second wall 111.

[0176] In the above technical solution, by setting a first adapter 14 to connect the first tab 121 and the electrode terminal 112, the connection difficulty between the first tab 121 and the electrode terminal 112 can be reduced, and the manufacturing efficiency of the battery cell 10 can be improved. A second insulating member 16 is provided between the first adapter 14 and the outer casing 11 to insulate and isolate the first adapter 14 and the outer casing 11, increasing the creepage distance between the first adapter 14 and the outer casing 11, thereby reducing the risk of internal short circuits in the battery cell 10 and making the battery 100 have higher reliability.

[0177] According to some embodiments of this application, please refer to Figure 8 and Figure 9 The first insulating member 13 is connected to the main body 120 and the second insulating member 16.

[0178] In some embodiments, the first insulating member 13 extends circumferentially along the main body portion in the y direction, and the thickness direction x of the first wall may be parallel to the width direction of the first insulating member 13. The phrase "the first insulating member 13 is connected to the main body portion 120 and the second insulating member 16" can be understood as follows: in the thickness direction x of the first wall, the first insulating member 13 may include three parts, one part connected to the main body portion 120, a second part located between the second insulating member 16 and the main body portion 120 for insulating the first tab 121 and the second wall 111, and the remaining part connected to the second insulating member 16.

[0179] In some embodiments, the connection between the first insulating member 13 and the main body 120 includes, but is not limited to, other connection methods such as bonding, welding, or bundling. The connection between the first insulating member 13 and the second insulating member 16 includes, but is not limited to, other connection methods such as bonding, welding, or bundling. In some embodiments, the first insulating member 13 may directly contact the surface of the second insulating member 16.

[0180] In the above technical solution, by setting the first insulating member 13 to be connected to the main body 120 and the second insulating member 16, the first insulating member 13 can be stably located on the outer peripheral surface of the main body 120, thereby effectively insulating and isolating the first tab 121 and the second wall 111, reducing the risk of short circuit inside the battery cell 10 caused by the first tab 121 overlapping with the outer casing 11, and thus making the battery 100 have high reliability.

[0181] In some other embodiments, the first insulating member 13 may not be connected to the second insulating member 16.

[0182] According to some embodiments of this application, see Figure 9 Along the thickness direction x of the first wall, the second insulating member 16 has a first surface 160 facing the electrode assembly 12, the first surface 160 is connected to the first tab 121, and along the direction from the body portion 120 to the first wall 110, the first insulating member 13 extends beyond the first surface 160.

[0183] The first surface 160 is the surface of the second insulating member 16 facing the electrode assembly 12 in the thickness direction x of the first wall. Exemplarily, the first surface 160 is the lower surface of the second insulating member 16, and the upper surface of the second insulating member 16 faces the first wall 110. In some embodiments, the first surface 160 is connected to the first tab 121.

[0184] The phrase "the first insulating member 13 extends beyond the first surface 160 in the direction from the main body 120 to the first wall 110" can be understood as the first insulating member 13 extending beyond the first surface 160 in the direction from the main body 120 to the first wall 110. That is, in the thickness direction of the first insulating member 13, the orthographic projection of the first insulating member 13 at least partially overlaps with the orthographic projection of the second insulating member 16. Alternatively, it can be understood that the second tab 122, located below the first surface 160, is further located below the surface of the first insulating member 13 facing the first wall 110.

[0185] In the above technical solution, by setting the first insulating member 13 to extend beyond the first surface 160, the creepage distance between the first tab 121 and the second wall 111 can be effectively increased, the risk of the first tab 121 and the second wall 111 overlapping can be effectively reduced, thereby reducing the risk of internal short circuit in the battery cell 10, and thus making the battery 100 have high reliability.

[0186] According to some embodiments of this application, in the direction from the main body 120 to the first wall 110, the first insulating member 13 extends beyond the first surface 160 by an dimension of h1, satisfying h1≥0.5mm.

[0187] The phrase "the dimension by which the first insulating member 13 extends beyond the first surface 160 along the direction from the main body 120 to the first wall 110 is h1" can be understood as the dimension by which the first insulating member 13 extends beyond the first tab 121 along the direction from the main body 120 to the first wall 110 being h1. In some embodiments, h1 can be a value greater than or equal to 0.5 mm, for example, h1 can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, or a larger value.

[0188] In the above technical solution, by setting the dimension h1 of the first insulating member 13 extending beyond the first surface 160 to be greater than or equal to 0.5 mm, the first insulating member 13 can effectively cover the first tab 121 in the direction of the main body 120 pointing towards the first wall 110, effectively increasing the creepage distance between the first tab 121 and the second wall 111, effectively reducing the risk of the first tab 121 and the second wall 111 overlapping, thereby reducing the risk of internal short circuit in the battery cell 10, and thus making the battery 100 have higher reliability.

[0189] According to some embodiments of this application, h1 ≥ 1.5 mm is satisfied.

[0190] In some embodiments, h1 can be a value greater than or equal to 1.5 mm. For example, h1 can be 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, or a larger value.

[0191] In the above technical solution, by setting the dimension h1 of the first insulating member 13 extending beyond the first surface 160 to be greater than or equal to 1.5mm, on the one hand, the connection between the first insulating member 13 and the second insulating member 16 can be made stable, and on the other hand, the first insulating member 13 can effectively cover the first tab 121 in the direction of the main body 120 pointing to the first wall 110, effectively increasing the creepage distance between the first tab 121 and the second wall 111, effectively reducing the risk of the first tab 121 and the second wall 111 overlapping, thereby reducing the risk of internal short circuit in the battery cell 10, and thus making the battery 100 have high reliability.

[0192] According to some embodiments of this application, the first insulating member 13 extends beyond the first end face 1200 in the direction from the first wall 110 to the main body 120.

[0193] The first end face 1200 is the end face of the main body 120 where the first electrode tab 121 and the second electrode tab 122 are provided. In some embodiments, the end face formed by the side of the main body 120 facing the first wall 110 and the end of the insulating film of the electrode assembly 12 facing the first wall 110 can be the first end face 1200. "The first insulating member 13 extends beyond the first end face 1200 in the direction from the first wall 110 to the main body 120" can be understood as the first insulating member 13 extending beyond the end of the insulating film of the electrode assembly 12 facing the first wall 110 in the direction from the first wall 110 to the main body 120; it can also be understood as the first insulating member 13 extending beyond the root of the first electrode tab 121 in the direction from the first wall 110 to the main body 120, and the root of the first electrode tab 121 can be understood as the part where the first electrode tab 121 and the main body 120 intersect.

[0194] In the above technical solution, by setting the insulating part to extend beyond the first end face 1200, the creepage distance between the first tab 121 and the second wall 111 can be effectively increased, the risk of the first tab 121 and the second wall 111 overlapping can be effectively reduced, thereby reducing the risk of internal short circuit in the battery cell 10, and thus making the battery 100 have high reliability.

[0195] According to some embodiments of this application, in the direction from the first wall 110 to the main body 120, the first insulating member 13 extends beyond the first end face 1200 by an dimension of h2, satisfying h2≥0.5mm.

[0196] The statement "the dimension by which the first insulating member 13 extends beyond the first end face 1200 in the direction from the first wall 110 to the main body 120 is h2" can be understood as the dimension by which the first insulating member 13 extends beyond the first end face 1200 in the direction from the first wall 110 to the main body 120 being h2. In some embodiments, h2 can be a value greater than or equal to 0.5 mm, for example, h2 can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, or a larger value.

[0197] In the above technical solution, by setting the dimension h2 of the first insulating member 13 extending beyond the first end face 1200 to be greater than or equal to 0.5mm, the first insulating member 13 can effectively cover the first tab 121 in the direction of the first wall 110 pointing towards the main body 120, effectively increasing the creepage distance between the first tab 121 and the second wall 111, effectively reducing the risk of the first tab 121 and the second wall 111 overlapping, thereby reducing the risk of internal short circuit in the battery cell 10, and thus making the battery 100 have higher reliability.

[0198] According to some embodiments of this application, h2 ≥ 1.5 mm is satisfied.

[0199] In some embodiments, h2 can be a value greater than or equal to 1.5 mm. For example, h2 can be 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, or a larger value.

[0200] In the above technical solution, by setting the dimension h2 of the first insulating member 13 extending beyond the first end face 1200 to be greater than or equal to 1.5mm, on the one hand, the connection between the first insulating member 13 and the main body 120 can be made stable, and on the other hand, the first insulating member 13 can effectively cover the first tab 121 in the direction of the first wall 110 pointing towards the main body 120, effectively increasing the creepage distance between the first tab 121 and the second wall 111, effectively reducing the risk of the first tab 121 and the second wall 111 overlapping, thereby reducing the risk of internal short circuit in the battery cell 10, and thus making the battery 100 have high reliability.

[0201] In some embodiments, the outer periphery of the electrode assembly 12 may be covered with an insulating film 17, which may cover the outer periphery of the main body 120, thereby insulating the main body 120 from the second wall 111. See also Figure 9 In the thickness direction x of the first wall, the first insulating member 13 is located on the side of the insulating film 17 close to the first wall 110.

[0202] According to some embodiments of this application, the thickness of the first insulating member 13 is T, which satisfies T≥30μm.

[0203] The thickness of the first insulating member 13 can refer to its thickness under unloaded conditions when it is not assembled between the first tab 121 and the second wall 111. Alternatively, the thickness can refer to its thickness after being deformed under pressure when assembled between the first tab 121 and the second wall 111. Finally, the thickness can be measured using a thickness gauge when the first insulating member 13 is assembled between the first tab 121 and the second wall 111 and removed from the battery cell 10.

[0204] In some embodiments, the thickness T of the first insulating member 13 can be a value greater than or equal to 30 μm, for example, T can be 30 μm, 31 μm, 32 μm, 33 μm, 34 μm, 35 μm or a larger value.

[0205] In the above technical solution, by setting the thickness T of the first insulating member 13 to be greater than or equal to 30μm, the risk of the first insulating member 13 breaking or being punctured can be reduced, the insulation and isolation effect of the first insulating member 13 can be improved, the risk of short circuit inside the battery cell 10 due to the overlap of the first tab 121 and the second wall 111 can be reduced, and the battery 100 has high reliability.

[0206] According to some embodiments of this application, the electrode assembly 12 is a wound electrode assembly 12, and the first electrode tab 121 includes a plurality of first sub-electrodes 1210, each of which has the same size in the winding direction of the electrode assembly 12. Alternatively, along the direction from the inner ring to the outer ring of the electrode assembly 12, the size of the plurality of first sub-electrodes 1210 gradually increases in the winding direction of the electrode assembly 12.

[0207] The electrode assembly 12 is a wound electrode assembly. The electrode assembly 12 includes a first electrode and a second electrode with opposite polarities and a separator. The first electrode, the second electrode and the separator are stacked and wound based on a winding axis.

[0208] The electrode assembly 12 formed by winding includes multiple turns of the first electrode sheet, and the first electrode tab 121 includes multiple first sub-electrode tabs 1210. The number of first sub-electrode tabs 1210 can be equal to or less than the number of turns of the first electrode sheet.

[0209] The phrase "each first sub-tab 1210 has the same size in the winding direction of the electrode assembly 12" can be understood as adjacent first sub-tabs 1210 having the same size in the winding direction, so that the first tab 121 has a regular shape, such as the first tab 121 being square, or the first tab 121 being approximately square. For example, see [link to relevant documentation]. Figure 10 , Figure 10 This is a top view of the electrode assembly 12 in some other embodiments of this application. Each first tab 1210 has the same dimensions in the winding direction of the electrode assembly 12, and the surface of the first tab 121 is square or approximately square.

[0210] The statement "Along the direction from the inner circle to the outer circle of the electrode assembly 12, the dimensions of the plurality of first sub-tabs 1210 gradually increase in the winding direction of the electrode assembly 12" can be understood as follows: Along two adjacent first sub-tabs 1210, the first sub-tab 1210 located on the inner circle has a smaller dimension in the winding direction than the first sub-tab 1210 located on the outer circle. For example, see... Figure 11 , Figure 11 This is a top view of the electrode assembly 12 in some other embodiments of this application. Along the direction from the inner circle to the outer circle of the electrode assembly 12, the dimensions of a plurality of first sub-tabs 1210 gradually increase in the winding direction of the electrode assembly 12. The surface of the first tab 121 is fan-shaped or approximately fan-shaped.

[0211] In some embodiments of the above technical solutions, by setting the dimensions of each first sub-tab 1210 in the winding direction of the electrode assembly 12 to the same size, the processing difficulty of the first sub-tab 1210 can be reduced (for example, when die-cutting the tabs, the die-cutting dimensions of each first sub-tab 1210 are the same, so the die-cutting efficiency is high), and the manufacturing efficiency of the battery 100 can be improved. In some embodiments, along the direction from the inner ring to the outer ring of the electrode assembly 12, by setting the dimensions of the multiple first sub-tabs 1210 in the winding direction of the electrode assembly 12 to gradually increase, the first tab 121 can fully utilize the internal space of the housing 11, so that the first tab 121 has a larger area to improve the current carrying capacity between the first tab 121 and the electrode terminal 112, so that the battery 100 has better charge and discharge performance.

[0212] According to some embodiments of this application, the electrode assembly 12 is a wound electrode assembly 12, and the second electrode tab 122 includes a plurality of second sub-electrodes 1220, each of which has the same size in the winding direction of the electrode assembly 12. Alternatively, along the direction from the inner ring to the outer ring of the electrode assembly 12, the size of the plurality of second sub-electrodes 1220 gradually increases in the winding direction of the electrode assembly 12.

[0213] The electrode assembly 12 is a wound electrode assembly 12. The electrode assembly 12 includes a first electrode and a second electrode with opposite polarities and a separator. The first electrode, the second electrode and the separator are stacked and wound based on a winding axis.

[0214] The wound electrode assembly 12 includes multiple turns of the second electrode plate, and the second electrode tab 122 includes multiple second sub-electrode tabs 1220. The number of second sub-electrode tabs 1220 can be equal to or less than the number of turns of the second electrode plate.

[0215] "Each second sub-tab 1220 has the same size in the winding direction of the electrode assembly 12" can be understood as adjacent second sub-tabs 1220 having the same size in the winding direction, so that the second tab 122 has a regular shape, such as the second tab 122 being square, or the second tab 122 being approximately square.

[0216] The statement "Along the direction from the inner circle to the outer circle of the electrode assembly 12, the dimensions of the plurality of second sub-tabs 1220 gradually increase in the winding direction of the electrode assembly 12" can be understood as follows: Along two adjacent second sub-tabs 1220, the dimension of the second sub-tab 1220 located on the inner circle in the winding direction is smaller than the dimension of the second sub-tab 1220 located on the outer circle. For example, in... Figure 10 and Figure 11 In the direction from the inner ring to the outer ring of the electrode assembly 12, the size of the plurality of first sub-tabs 1210 gradually increases in the winding direction of the electrode assembly 12, and the surface of the first tab 121 is fan-shaped or approximately fan-shaped.

[0217] In the above technical solutions, in some embodiments, by setting the size of each second sub-tab 1220 in the winding direction of the electrode assembly 12 to the same size, the processing difficulty of the second sub-tab 1220 can be reduced (for example, when die-cutting the tabs, the die-cutting size of each second sub-tab 1220 is the same, so the die-cutting efficiency is high), and the manufacturing efficiency of the battery 100 can be improved. In some embodiments, along the direction from the inner ring to the outer ring of the electrode assembly 12, by setting the size of the multiple second sub-tabs 1220 in the winding direction of the electrode assembly 12 to gradually increase, the second tabs 122 can fully utilize the internal space of the housing 11, so that the second tabs 122 have a larger area to improve the current flow capacity between the second tabs 122 and the housing 11, so that the battery 100 has better charge and discharge performance.

[0218] According to some embodiments of this application, please refer to Figure 11 , Figure 11 This is a top view of the electrode assembly 12 in some embodiments of this application. The first tab 121 has a second surface 1211 facing the first wall 110, and the second surface 1211 is fan-shaped.

[0219] The second surface 1211 is the surface of the first tab 121 facing the first wall 110. In some embodiments, the second surface 1211 is the surface on which the first tab 121 is electrically connected to the electrode terminal 112. For example, the second surface 1211 is electrically connected to the electrode terminal 112 by connecting to the first adapter 14.

[0220] "The second surface 1211 is fan-shaped" can be understood as the second surface 1211 extending in an arc-shaped trajectory. For example, the first end face 1200 is circular, and the second surface 1211 extends along the circumference of the first end face 1200 to form a fan shape with the center of the first end face 1200 as the center.

[0221] The center of the fan-shaped second surface 1211 may be located on the central axis of the main body 120, or it may not be located on the central axis of the main body 120. For example, in... Figure 11 In the middle, the center of the fan-shaped second surface 1211 is located on the central axis of the main body 120.

[0222] In the above technical solution, by setting the second surface 1211 of the first tab 121 as a fan-shaped structure, the first tab 121 can make full use of the internal space of the outer shell 11, so that the first tab 121 has a larger area to improve the overcurrent capacity between the first tab 121 and the electrode terminal 112, and so that the battery 100 has better charging and discharging performance.

[0223] According to some embodiments of this application, see Figure 11 Along the circumferential direction y of the main body, the second surface 1211 has a first edge 12110 and a second edge 12111 that are far apart from each other, and the angle between the first edge 12110 and the second edge 12111 is β1, where 0 < β1 ≤ 270°.

[0224] In some embodiments, the arcuate trajectory of the second surface 1211 is parallel to the circumferential direction y of the main body, and the center of the circle corresponding to the second surface 1211 may be located on the central axis of the main body 120.

[0225] The first edge 12110 and the second edge 12111 are two edges of the second surface 1211 that are far apart from each other on its arc-shaped trajectory. The angle between the first edge 12110 and the second edge 12111 can correspond to the central angle of the fan-shaped second surface 1211.

[0226] In some embodiments, the angle β1 between the first edge 12110 and the second edge 12111 is less than or equal to 270°. For example, the angle β1 between the first edge 12110 and the second edge 12111 can be 1°, 2°…45°, 46°, 47°…90°, 91°, 92°…180°, 181°, 182°…268°, 269°, 270° or any value between two adjacent values.

[0227] In the above technical solution, by setting the angle β1 formed between the first edge 12110 and the second edge 12111 of the first electrode 121 to be less than or equal to 270 degrees, the central angle of the second surface 1211 of the fan-shaped first electrode 121 is less than or equal to 270 degrees, so as to alleviate the phenomenon that the first electrode 121 and the second electrode 122 are easily short-circuited due to the excessive space occupied by the first electrode 121, thereby making the battery 100 have high reliability.

[0228] According to some embodiments of this application, see Figure 11 The second electrode 122 has a third surface 1221 facing the first wall 110, and the third surface 1221 is fan-shaped.

[0229] The third surface 1221 is the surface of the second tab 122 facing the first wall 110. In some embodiments, the third surface 1221 is the surface on which the second tab 122 is electrically connected to the housing 11. For example, the third surface 1221 is electrically connected to the first wall 110 by connecting to the second adapter 15.

[0230] "The third surface 1221 is fan-shaped" can be understood as the third surface 1221 extending in an arc-shaped trajectory. For example, the first end face 1200 is circular, and the third surface 1221 extends along the circumference of the first end face 1200 to form a fan shape with the first end face 1200 as the center.

[0231] The center of the fan-shaped third surface 1221 may be located on the central axis of the main body 120, or it may not be located on the central axis of the main body 120. For example, in... Figure 11 In the middle, the center of the fan-shaped third surface 1221 is located on the central axis of the main body 120.

[0232] In the above technical solution, by setting the third surface 1221 of the second tab 122 as a fan-shaped structure, the second tab 122 can make full use of the internal space of the outer casing 11, so that the second tab 122 has a larger area to improve the overcurrent capacity between the second tab 122 and the outer casing 11, and the battery 100 has better charging and discharging performance.

[0233] According to some embodiments of this application, along the circumferential direction y of the main body, the third surface 1221 has a third edge 12210 and a fourth edge 12211 that are far apart from each other, and the angle between the third edge 12210 and the fourth edge 12211 is β2, where 0 < β2 ≤ 180°.

[0234] In some embodiments, the arcuate trajectory of the third surface 1221 is parallel to the circumferential direction y of the main body, and the center of the circle corresponding to the third surface 1221 may be located on the central axis of the main body 120.

[0235] The third edge 12210 and the fourth edge 12211 are two edges of the third surface 1221 that are far apart from each other on its arcuate trajectory. The angle between the third edge 12210 and the fourth edge 12211 can correspond to the central angle of the fan-shaped third surface 1221.

[0236] In some embodiments, the angle β2 between the third edge 12210 and the fourth edge 12211 is less than or equal to 180°. For example, the angle β2 between the third edge 12210 and the fourth edge 12211 can be 1°, 2°…45°, 46°, 47°…90°, 91°, 92°…179°, 180° or any value between two adjacent values.

[0237] In the above technical solution, by setting the angle β2 formed between the third edge 12210 and the fourth edge 12211 of the second electrode 122 to less than or equal to 180 degrees, the central angle of the third surface 1221 of the fan-shaped second electrode 122 is less than or equal to 180 degrees, so as to alleviate the phenomenon that the first electrode 121 and the second electrode 122 are easily short-circuited due to the excessive space occupied by the second electrode 122, thereby making the battery 100 have high reliability.

[0238] According to some embodiments of this application, the electrode assembly 12 includes a first electrode and a second electrode, and the electrode assembly 12 is a wound electrode assembly 12. The first electrode includes a plurality of first sub-electrode tabs 1210, which form a first electrode tab 121. The innermost n1 turns of the first electrode do not have first sub-electrode tabs 1210, where n1 ≥ 1. And / or, the second electrode includes a plurality of second sub-electrode tabs 1220, which form a second electrode tab 122. The innermost n2 turns of the second electrode do not have second electrode tabs 1220, where n2 ≥ 1.

[0239] The electrode assembly 12 is a wound electrode assembly. The electrode assembly 12 includes a first electrode and a second electrode with opposite polarities and a separator. The first electrode, the second electrode and the separator are stacked and wound based on a winding axis, and a central through hole 123 is formed in the center of the main body 120.

[0240] In some embodiments, the wound electrode assembly 12 includes multiple turns of first electrode sheet, and the first electrode tab 121 includes multiple first sub-electrode tabs 1210. The number of first sub-electrode tabs 1210 may be less than the number of turns of the first electrode sheet. For example, the innermost n1 turns of the first electrode sheet do not have first sub-electrode tabs 1210, such as the innermost first and second turns of the first electrode sheet, so that there is a certain distance between the first electrode tab 121 and the central through hole 123. The value of n1 can be 1 or an integer greater than 1. For example, the innermost 1st turn, innermost 2nd turn, innermost 3rd turn, innermost 4th turn, or more innermost turns of the first electrode sheet do not have first sub-electrode tabs 1210. See also Figure 11 In the middle, there is a certain distance between the edge of the first electrode 121 closest to the central through hole 123 and the central through hole 123.

[0241] In some embodiments, the wound electrode assembly 12 includes multiple turns of second electrode sheets, and the second electrode tab 122 includes multiple second sub-electrode tabs 1220. The number of second sub-electrode tabs 1220 can be less than the number of turns of the second electrode sheets. For example, the innermost n2 turns of the second electrode sheet do not have second sub-electrode tabs 1220, such as the innermost first and second turns of the second electrode sheet, which leaves a certain distance between the second electrode tabs 122 and the central through hole 123. The value of n2 can be 1 or an integer greater than 1. For example, the innermost 1st, 2nd, 3rd, 4th, or more turns of the second electrode sheet do not have second sub-electrode tabs 1220. See also... Figure 11 In the middle, there is a certain distance between the edge of the second electrode 122 closest to the central through hole 123 and the central through hole 123.

[0242] In the above technical solution, by not providing the first sub-tab 1210 on the first electrode plate of the innermost n1 turns, the first tab 121 and the second tab 122 can be effectively spaced apart, thereby reducing the risk of short circuit between the first tab 121 and the second tab 122, which is beneficial to improving the reliability of the battery 100. Similarly, by not providing the second sub-tab 1220 on the second electrode plate of the innermost n2 turns, the second tab 122 and the first tab 121 can be effectively spaced apart, thereby reducing the risk of short circuit between the second tab 122 and the first tab 121, which is beneficial to improving the reliability of the battery 100.

[0243] According to some embodiments of this application, the electrode assembly 12 includes a first electrode and a second electrode, and the electrode assembly 12 is a wound electrode assembly 12. The first electrode includes a plurality of first sub-electrode tabs 1210, which form a first electrode tab 121. The outermost m1 turns of the first electrode do not have first sub-electrode tabs 1210, where m1 ≥ 1. And / or, the second electrode includes a plurality of second sub-electrode tabs 1220, which form a second electrode tab 122. The outermost m2 turns of the second electrode do not have second electrode tabs 1220, where m2 ≥ 1.

[0244] The electrode assembly 12 is a wound electrode assembly. The electrode assembly 12 includes a first electrode and a second electrode with opposite polarities and a separator. The first electrode, the second electrode and the separator are stacked and wound based on a winding axis.

[0245] In some embodiments, the wound electrode assembly 12 includes multiple turns of first electrode sheets, and the first electrode tab 121 includes multiple first sub-electrode tabs 1210. The number of first sub-electrode tabs 1210 may be less than the number of turns of the first electrode sheets. For example, the outermost m1 turns of the first electrode sheet do not have first sub-electrode tabs 1210, such as the outermost first and second turns of the first electrode sheet, so that there is a certain distance between the first electrode tabs 121 and the outer peripheral surface of the main body 120. The value of m1 can be 1 or an integer greater than 1. For example, the outermost 1 turn, outermost 2 turns, outermost 3 turns, outermost 4 turns, or more outermost turns of the first electrode sheet do not have first sub-electrode tabs 1210. See also Figure 11 In the middle, there is a certain distance between the edge of the first electrode 121 closest to the outer peripheral surface of the main body 120 and the outer peripheral surface of the main body 120.

[0246] In some embodiments, the wound electrode assembly 12 includes multiple turns of second electrode sheets, and the second electrode tab 122 includes multiple second sub-electrode tabs 1220. The number of second sub-electrode tabs 1220 may be less than the number of turns of the second electrode sheets. For example, the outermost m2 turns of the second electrode sheet do not have second sub-electrode tabs 1220, such as the outermost first and second turns of the second electrode sheet, which creates a certain distance between the second electrode tabs 122 and the outer peripheral surface of the main body 120. The value of m2 can be 1 or an integer greater than 1; for example, the outermost 1 turn, outermost 2 turns, outermost 3 turns, outermost 4 turns, or more outermost turns of the second electrode sheet do not have second sub-electrode tabs 1220. See also... Figure 11 In the middle, there is a certain distance between the edge of the second electrode 122 closest to the outer peripheral surface of the main body 120 and the outer peripheral surface of the main body 120.

[0247] In the above technical solution, by not providing the first sub-tab 1210 on the first electrode plate of the outermost m1 ring, the first tab 121 and the second wall 111 can be effectively spaced apart, thereby reducing the risk of short circuit between the first tab 121 and the second wall 111, which is beneficial to improving the reliability of the battery 100. By not providing the second sub-tab 1220 on the second electrode plate of the outermost m2 ring, the second tab 122 and the first wall 110 can be effectively spaced apart, thereby reducing the risk of the second tab 122 being damaged due to interference between the second tab 122 and the second wall 111 when the electrode assembly 12 is placed into the housing 11, which is beneficial to improving the reliability of the battery 100.

[0248] According to some embodiments of this application, this application also provides a battery 100, which includes a battery cell 10 of any of the above schemes.

[0249] Among them, see Figure 2 As shown, the battery 100 may also include a housing 20, in which the battery cells 10 are housed.

[0250] In some embodiments, the housing 20 may include a first housing body 21 and a second housing body 22, the first housing body 21 and the second housing body 22 covering each other, the first housing body 21 and the second housing body 22 together defining an assembly space for accommodating the battery cell 10.

[0251] Optionally, the second box body 22 can be a hollow structure with one end open, and the first box body 21 can be a plate-like structure. The first box body 21 covers the open side of the second box body 22 so that the first box body 21 and the second box body 22 together define the assembly space; the first box body 21 and the second box body 22 can also be hollow structures with one side open, and the open side of the first box body 21 covers the open side of the second box body 22.

[0252] Of course, the box 20 formed by the first box body 21 and the second box body 22 can be of various shapes, such as a cylinder or a cuboid. For example, in... Figure 2 In the middle, box 20 has a rectangular structure.

[0253] Optionally, the battery cell 10 disposed within the housing 20 can be one or more. For example, in... Figure 2 In this battery 100, the housing 20 contains multiple battery cells 10. These battery cells 10 can be connected in series, parallel, or a combination thereof. A combination thereof means that some of the battery cells 10 are connected in series and others in parallel. The multiple battery cells 10 can be directly connected in series, parallel, or a combination thereof, and then the entire assembly of the multiple battery cells 10 is housed within the housing 20. Alternatively, the battery 100 can also be composed of multiple battery cells 10 first connected in series, parallel, or a combination thereof to form a battery module, and then these battery modules can be connected in series, parallel, or a combination thereof to form a whole, which is then housed within the housing 20.

[0254] The battery 100 may also include other structures. For example, the battery 100 may also include a busbar component that connects multiple battery cells 10 to achieve electrical connection between the multiple battery cells 10.

[0255] It should be noted that in some embodiments, the battery 100 may not have a housing 20. The battery 100 includes multiple battery cells 10, and the battery 100 composed of multiple battery cells 10 can be directly mounted onto an electrical device to provide power to the electrical device through the multiple battery cells 10. That is, the housing 20 can be part of the electrical device. Taking a vehicle as an example, the housing 20 can be part of the vehicle's chassis structure. For example, a portion of the housing 20 can be at least a part of the vehicle's floor, or a portion of the housing 20 can be at least a part of the vehicle's crossbeams and longitudinal beams.

[0256] According to some embodiments of this application, this application also provides an electrical device, which includes a battery cell 10 of any of the above schemes, and the battery cell 10 is used to provide electrical energy to the electrical device.

[0257] According to some embodiments of this application, please refer to Figures 4-11 This application provides a battery cell 10 in some embodiments. The battery cell 10 includes a housing 11, electrode terminals 112, electrode assembly 12, a first insulating member 13, a first adapter 14, a second adapter 15, and a second insulating member 16.

[0258] The outer casing 11 has a first wall 110 and a second wall 111, with the second wall 111 surrounding the edge of the first wall 110. The first end wall can be an end cap of the outer casing 11, and the second wall 111 can be the shell of the outer casing 11 or a peripheral wall of the outer casing 11. Electrode terminals 112 are insulatedly mounted on the first wall 110. Electrode assembly 12 is housed within the outer casing 11. Electrode assembly 12 includes a main body 120, a first electrode tab 121, and a second electrode tab 122. The first electrode tab 121 and the second electrode tab 122 have opposite polarities. Along the thickness direction x of the first wall, the main body 120 has a first end face 1200 near the first wall 110. The first electrode tab 121 and the second electrode tab 122 are both disposed on the first end face 1200. The first electrode tab 121 is electrically connected to the electrode terminal 112 via a first adapter 14, and the second electrode tab 122 is electrically connected to the first wall 110 via a second adapter 15.

[0259] The surfaces of the first tab 121 and the second tab 122 facing the first wall 110 are both fan-shaped, so as to make full use of the internal space of the cylindrical outer shell 11.

[0260] The second insulating member 16 is disposed between the electrode assembly 12 and the first wall 110. The second insulating member 16 is used to insulate and isolate the first adapter 14 and the second adapter 15, as well as the first adapter 14 and the second wall 111, and the first adapter 14 and the first wall 110. The first surface 160 of the second insulating member 16 is in contact with the first tab 121.

[0261] A first insulating member 13 is disposed on the outer peripheral surface of the main body 120. A portion of the first insulating member 13 is located between the first tab 121 and the second wall 111 to insulate the first tab 121 from the second wall 111. The first insulating member 13 is sheet-shaped, with a portion connected to the outer periphery of the main body 120 and another portion connected to the outer periphery of the second insulating member 16. This ensures that a portion of the first insulating member 13 is stably positioned between the first tab 121 and the second wall 111, achieving insulation between the first tab 121 and the second wall 111.

[0262] The first insulating member 13 is disposed around the outer periphery of the first electrode tab 121, but does not surround the outer periphery of the second electrode tab 122. Along the circumferential direction y of the main body, the central angle α1 corresponding to the first insulating member 13 is greater than the central angle α2 corresponding to the first electrode tab 121.

[0263] Along the direction from the main body 120 to the first wall 110, the insulating member extends beyond the first surface 160. The dimension h1 of the first insulating member extending beyond the first surface 160 can be greater than or equal to 0.5 mm. In some embodiments, the dimension h1 of the first insulating member extending beyond the first surface 160 can be greater than or equal to 1.5 mm. Along the direction from the first wall 110 to the main body 120, the first insulating member 13 extends beyond the first end face 1200. The dimension h2 of the first insulating member 13 extending beyond the first end face 1200 can be greater than or equal to 0.5 mm. In some embodiments, the dimension h2 of the insulating member extending beyond the first end face 1200 can be greater than or equal to 1.5 mm.

[0264] The above description is merely a preferred embodiment of this application and is not intended to limit the application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, characterized in that, include: The outer shell has a first wall and a second wall, the second wall surrounding the edge of the first wall; Electrode terminals are insulated and mounted on the first wall; An electrode assembly is housed within the housing. The electrode assembly includes a main body, a first electrode tab, and a second electrode tab. The first electrode tab and the second electrode tab have opposite polarities. Along the thickness direction of the first wall, the main body has a first end face near the first wall. The first electrode tab and the second electrode tab are both disposed on the first end face. The first electrode tab is electrically connected to the electrode terminal, and the second electrode tab is electrically connected to the housing. A first insulating member is disposed on the outer peripheral surface of the main body, and a portion of the first insulating member is located between the first tab and the second wall so that the first tab and the second wall are mutually insulated and isolated.

2. The battery cell according to claim 1, characterized in that, Along the circumference of the main body, the central angle corresponding to the first insulating member is α1, where α1 < 360°.

3. The battery cell according to claim 1, characterized in that, Along the circumference of the main body, the central angle corresponding to the first insulating member is α1, and the central angle corresponding to the first tab is α2, satisfying α1 > α2.

4. The battery cell according to claim 1, characterized in that, Along the circumference of the main body, the central angle corresponding to the first insulating member is α1, and the central angle corresponding to the second electrode tab is α3, satisfying α1+α3<360°.

5. The battery cell according to claim 1, characterized in that, Along the circumference of the main body, the first insulating member does not surround the second electrode tab.

6. The battery cell according to claim 1, characterized in that, The battery cell also includes: A first adapter connects the first tab and the electrode terminal; A second insulating element is disposed between the first adapter and the housing to insulate the first adapter and the housing.

7. The battery cell according to claim 6, characterized in that, The first insulating member is connected to the main body and the second insulating member.

8. The battery cell according to claim 6, characterized in that, Along the thickness direction of the first wall, the second insulating member has a first surface facing the electrode assembly, the first surface being connected to the first tab, and the first insulating member extending beyond the first surface along the direction of the body portion toward the first wall.

9. The battery cell according to claim 8, characterized in that, Along the direction from the main body to the first wall, the first insulating member extends beyond the first surface by a dimension of h1, satisfying h1≥0.5mm.

10. The battery cell according to claim 9, characterized in that, The requirement is h1≥1.5mm.

11. The battery cell according to claim 1, characterized in that, Along the direction from the first wall toward the main body, the first insulating member extends beyond the first end face.

12. The battery cell according to claim 11, characterized in that, Along the direction from the first wall to the main body, the first insulating member extends beyond the first end face by a dimension of h2, satisfying h2≥0.5mm.

13. The battery cell according to claim 12, characterized in that, The requirement is h2≥1.5mm.

14. The battery cell according to claim 1, characterized in that, The thickness of the first insulating element is T, which satisfies T≥30μm.

15. The battery cell according to any one of claims 1-14, characterized in that, The electrode assembly is a wound electrode assembly, and the first electrode tab includes multiple first sub-electrodes, each of which has the same size in the winding direction of the electrode assembly; or Along the direction from the inner ring to the outer ring of the electrode assembly, the dimensions of the plurality of first sub-tabs gradually increase in the winding direction of the electrode assembly.

16. The battery cell according to any one of claims 1-14, characterized in that, The electrode assembly is a wound electrode assembly, and the second electrode tab includes a plurality of second sub-electrodes, each of which has the same size in the winding direction of the electrode assembly; or Along the direction from the inner ring to the outer ring of the electrode assembly, the dimensions of the plurality of second sub-tabs gradually increase in the winding direction of the electrode assembly.

17. The battery cell according to any one of claims 1-14, characterized in that, The first electrode has a second surface facing the first wall, and the second surface is fan-shaped.

18. The battery cell according to claim 17, characterized in that, Along the circumference of the main body, the second surface has a first edge and a second edge that are far apart from each other, and the angle between the first edge and the second edge is β1, where 0 < β1 ≤ 270°.

19. The battery cell according to any one of claims 1-14, characterized in that, The second electrode has a third surface facing the first wall, and the third surface is fan-shaped.

20. The battery cell according to claim 19, characterized in that, Along the circumference of the main body, the third surface has a third edge and a fourth edge that are far apart from each other, and the angle between the third edge and the fourth edge is β2, where 0 < β2 ≤ 180°.

21. The battery cell according to claim 1, characterized in that, The electrode assembly includes a first electrode and a second electrode, and the electrode assembly is a wound electrode assembly; The first electrode includes multiple first sub-electrodes, which together form the first electrode tab. The innermost n1 turns of the first electrode do not have any first sub-electrodes, where n1 ≥ 1; and / or The second electrode includes multiple second sub-electrodes, which together form the second electrode tab. The second electrode in the innermost n2 turns does not have a second sub-electrode tab, where n2 ≥ 1.

22. The battery cell according to claim 1, characterized in that, The electrode assembly includes a first electrode and a second electrode, and the electrode assembly is a wound electrode assembly; The first electrode includes multiple first sub-electrode tabs, which together form the first electrode tab. The outermost m1 ring of the first electrode does not have any first sub-electrode tabs, where m1 ≥ 1; and / or The second electrode includes multiple second sub-electrodes, which together form the second electrode tab. The outermost m2 ring of the second electrode does not have a second sub-electrode tab, where m2 ≥ 1.

23. A battery, characterized in that, Includes the battery cell as described in any one of claims 1-22.

24. An electrical appliance, characterized in that, Includes a battery cell as described in any one of claims 1-22, the battery cell being used to provide electrical energy.

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