Battery cell, battery, and electrical device

Abstract

The present application discloses a battery cell, a battery, and an electrical device. The battery cell comprises a casing, an electrode terminal, an electrode assembly, and a first insulating member. The casing has a first wall and a second wall, and the second wall surrounds the edge of the first wall. The electrode terminal is mounted on the first wall in an insulating manner. The electrode assembly is accommodated in the casing. The electrode assembly comprises a main body portion, a first tab and a second tab, and the first tab and the second tab have opposite polarities. In a thickness direction of the first wall, the main body portion has a first end surface close to the first wall, and the first tab and the second tab are both provided on the first end surface. 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 provided on the outer peripheral surface of the main body portion, 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 insulated and isolated from each other. The technical solution provided by the present application can improve the reliability of the battery.

Description

Battery cells, batteries and electrical devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 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] The present application relates to the field of battery technology, and in particular to a battery cell, a battery, and an electrical device. Background Art

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

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

[0006] Summary of the Invention

[0007] The present application provides a battery cell, a battery, and an electrical device. The technical solution provided in the present application can improve the reliability of the battery.

[0008] This application is achieved through the following technical solutions:

[0009] In a first aspect, the present application provides a battery cell comprising a shell, an electrode terminal, an electrode assembly, and a first insulating member. The shell has a first wall and a second wall, and the second wall is arranged around the edge of the first wall. The electrode terminal is insulated and mounted on the first wall. The electrode assembly is housed in the shell, and the electrode assembly comprises a main body, a first pole lug, and a second pole lug. The polarities of the first pole lug and the second pole lug are opposite. Along the thickness direction of the first wall, the main body has a first end face close to the first wall, and the first pole lug and the second pole lug are both arranged on the first end face. The first pole lug is electrically connected to the electrode terminal, and the second pole lug is electrically connected to the shell. The first insulating member is arranged on the outer peripheral surface of the main body, and a portion of the first insulating member is located between the first pole lug and the second wall so that the first pole lug and the second wall are insulated and isolated from each other.

[0010] In the above technical solution, by arranging the first and second tabs of the electrode assembly on the same end surface of the main body (i.e., the first end surface), the space occupied by the electrode assembly in the thickness direction of the first wall is reduced, thereby improving the energy density of the battery cell having such an electrode assembly. The battery cell further includes a first insulating member, a portion of which is located between the first tab and the second wall of the outer shell, thereby isolating the first tab from the second wall. This reduces the risk of the first tab overlapping the second wall (i.e., the outer shell of the battery) and causing an internal short circuit in the battery cell, thereby improving the reliability of the battery.

[0011] According to some embodiments of the present application, along the circumference of the main body, the central angle corresponding to the first insulating member is α1, and α1<360°.

[0012] In the above technical solution, by setting the central angle α1 corresponding to the first insulating member to be less than 360°, that is, the first insulating member does not need to cover the outer circumference of the main body, and the first insulating member plays the role of insulating and isolating the first pole ear and the second wall, the material used in the first insulating member is reduced, which saves the cost of manufacturing the battery cell, thereby reducing the manufacturing cost of the battery.

[0013] According to some embodiments of the present 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 tab is α2, satisfying α1>α2.

[0014] In the above technical solution, by setting the central angle α1 corresponding to the first insulating member to be greater than the central angle α2 corresponding to the first pole lug, the first insulating member can effectively insulate the first pole lug from the second wall, thereby increasing the creepage distance between the first pole lug and the second wall, thereby reducing the risk of internal short circuit in the battery cell, and thus making the battery have higher reliability.

[0015] According to some embodiments of the present 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 tab is α3, satisfying α1+α3<360°.

[0016] In the above technical solution, by limiting the sum of the central angle α1 corresponding to the first insulating member and the central angle α2 corresponding to the second pole ear to less than 360°, the first insulating member can reduce the material used for the first insulating member while insulating and isolating the first pole ear and the second wall, thereby achieving the purpose of saving the production cost of the battery cell and further reducing the production cost of the battery.

[0017] According to some embodiments of the present application, along the circumference of the main body, the first insulating member does not surround the second electrode tab.

[0018] In the above technical solution, along the circumference of the main body, by arranging the first insulating member not surrounding the second pole ear, the first insulating member can be arranged not corresponding to the second pole ear under the condition of effectively insulating and isolating the first pole ear and the second wall, that is, the second pole ear can be not arranged between the second pole ear and the second wall, thereby effectively reducing the material used for the first insulating member and further reducing the manufacturing cost of the battery.

[0019] According to some embodiments of the present application, the battery cell further includes a first adapter connecting the first tab and the electrode terminal and a second insulating member disposed between the first adapter and the housing to insulate and isolate the first adapter from the housing.

[0020] In the above technical solution, by providing a first adapter to connect the first tab and the electrode terminal, the difficulty of connecting the first tab and the electrode terminal can be reduced, thereby improving the production efficiency of the battery cell. A second insulating member is provided between the first adapter and the outer shell to insulate and isolate the first adapter and the outer shell, thereby increasing the creepage distance between the first adapter and the outer shell, thereby reducing the risk of internal short circuits in the battery cell and ensuring higher battery reliability.

[0021] According to some embodiments of the present application, the first insulating member is connected to the main body and the second insulating member.

[0022] 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 pole ear and the second wall, reducing the risk of internal short circuit of the battery cell caused by overlapping of the first pole ear and the outer shell, and thus making the battery have higher reliability.

[0023] According to some embodiments of the present application, along the thickness direction of the first wall, the second insulating member has a first surface facing the electrode assembly, the first surface is connected to the first electrode tab, and along the direction of the main body pointing to the first wall, the first insulating member extends beyond the first surface.

[0024] In the above technical solution, by setting the first insulating member to extend beyond the first surface, the creepage distance between the first pole ear and the second wall can be effectively increased, and the risk of overlap between the first pole ear and the second wall can be effectively reduced, thereby reducing the risk of internal short circuit in the battery cell, thereby making the battery have higher reliability.

[0025] According to some embodiments of the present application, along the direction from the main body to the first wall, the first insulating member extends beyond the first surface by a dimension h1, satisfying h1 ≥ 0.5 mm.

[0026] In the above technical solution, by setting the dimension h1 of the first insulating member protruding from the first surface to be greater than or equal to 0.5 mm, the first insulating member can effectively cover the first pole ear in the direction of the main body pointing to the first wall, effectively increase the creepage distance between the first pole ear and the second wall, and effectively reduce the risk of overlap between the first pole ear and the second wall, thereby reducing the risk of internal short circuit of the battery cell, and thus making the battery have higher reliability.

[0027] According to some embodiments of the present application, h1≥1.5 mm is satisfied.

[0028] In the above technical solution, by setting the dimension h1 of the first insulating member protruding from the first surface to be greater than or equal to 1.5 mm, on the one hand, the connection between the first insulating member and the second insulating member can be made firm, and on the other hand, the first insulating member can effectively cover the first pole ear in the direction of the main body pointing to the first wall, effectively increasing the creepage distance between the first pole ear and the second wall, and effectively reducing the risk of overlap between the first pole ear and the second wall, thereby reducing the risk of internal short circuit of the battery cell, and thus making the battery have higher reliability.

[0029] According to some embodiments of the present application, along the direction from the first wall to the main body, the first insulating member extends beyond the first end surface.

[0030] In the above technical solution, by setting the insulating part to extend beyond the first end face, the creepage distance between the first pole ear and the second wall can be effectively increased, and the risk of overlap between the first pole ear and the second wall can be effectively reduced, thereby reducing the risk of internal short circuit in the battery cell, thereby making the battery have higher reliability.

[0031] According to some embodiments of the present application, along the direction from the first wall to the main body, the first insulating member extends beyond the first end surface by a dimension h2, satisfying h2 ≥ 0.5 mm.

[0032] 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 0.5 mm, the first insulating member can effectively cover the first pole ear in the direction from the first wall to the main body, effectively increase the creepage distance between the first pole ear and the second wall, and effectively reduce the risk of overlap between the first pole ear and the second wall, thereby reducing the risk of internal short circuit of the battery cell, and thus making the battery have higher reliability.

[0033] According to some embodiments of the present application, h2≥1.5 mm is satisfied.

[0034] 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 1.5 mm, on the one hand, the connection between the first insulating member and the main body can be firmly established; on the other hand, the first insulating member can effectively cover the first pole ear in the direction from the first wall to the main body, thereby effectively increasing the creepage distance between the first pole ear and the second wall, and effectively reducing the risk of overlap between the first pole ear and the second wall, thereby reducing the risk of internal short circuit of the battery cell, and thus making the battery have higher reliability.

[0035] According to some embodiments of the present application, the thickness of the first insulating member is T, satisfying T≥30 μm.

[0036] In the above technical solution, by setting the thickness T of the first insulating member to be greater than or equal to 30 μm, the risk of the first insulating member being broken or punctured can be reduced, the insulating isolation effect of the first insulating member can be improved, and the risk of internal short circuit of the battery cell due to overlap between the first tab and the second wall can be reduced, so that the battery has higher reliability.

[0037] According to some embodiments of the present application, the electrode assembly is a wound electrode assembly, and the first electrode tab includes a plurality of first sub-electrode tabs, each of which has the same size in the winding direction of the electrode assembly. Alternatively, the sizes of the plurality of first sub-electrode tabs in the winding direction of the electrode assembly gradually increase from the inner ring to the outer ring.

[0038] In the above technical solution, in some embodiments, by setting the dimensions of each first sub-tab in the winding direction of the electrode assembly to be the same, the processing difficulty of the first sub-tab can be reduced (for example, when die-cutting the tab, each first sub-tab has the same die-cut dimensions, thereby improving die-cutting efficiency), thereby improving battery manufacturing efficiency. In some embodiments, by setting the dimensions of the multiple first sub-tabs in the winding direction of the electrode assembly to gradually increase from the inner circle to the outer circle of the electrode assembly, the first tab can fully utilize the internal space of the housing, resulting in a larger area for the first tab, thereby improving the flow capacity between the first tab and the electrode terminal, and thus improving the battery's charge and discharge performance.

[0039] According to some embodiments of the present application, the electrode assembly is a wound electrode assembly, and the second electrode tab includes a plurality of second sub-electrode tabs, each of which has the same size along the winding direction of the electrode assembly. Alternatively, the plurality of second sub-electrode tabs may have gradually increasing sizes along the winding direction of the electrode assembly, from the inner ring toward the outer ring.

[0040] In the above technical solution, in some embodiments, by setting the dimensions of each second sub-tab in the winding direction of the electrode assembly to be the same, the processing difficulty of the second sub-tab can be reduced (for example, when die-cutting the tab, each second sub-tab has the same die-cut dimensions, so the die-cutting efficiency is high), thereby improving the manufacturing efficiency of the battery. In some embodiments, along the direction from the inner circle to the outer circle of the electrode assembly, by setting the dimensions of the plurality of second sub-tabs in the winding direction of the electrode assembly to gradually increase, the second tab can fully utilize the internal space of the outer shell, so that the second tab has a larger area, thereby improving the flow capacity between the second tab and the outer shell, and thus improving the charge and discharge performance of the battery.

[0041] According to some embodiments of the present application, the first electrode tab has a second surface facing the first wall, and the second surface is fan-shaped.

[0042] In the above technical solution, by setting the second surface of the first pole tab to a fan-shaped structure, the first pole tab can fully utilize the internal space of the shell, so that the first pole tab has a larger area to improve the flow capacity between the first pole tab and the electrode terminal, so that the battery has better charge and discharge performance.

[0043] According to some embodiments of the present application, along the circumference of the main body, the second surface has a first edge and a second edge that are far away from each other, and the angle between the first edge and the second edge is β1, 0<β1≤270°.

[0044] In the above technical solution, by setting the angle β1 formed between the first edge and the second edge of the first pole tab to be less than or equal to 270 degrees, the central angle of the second surface of the fan-shaped first pole tab is less than or equal to 270 degrees, so as to alleviate the phenomenon that the first pole tab and the second pole tab are easily overlapped due to the large space occupied by the first pole tab, thereby making the battery have higher reliability.

[0045] According to some embodiments of the present application, the second electrode tab has a third surface facing the first wall, and the third surface is fan-shaped.

[0046] In the above technical solution, by setting the third surface of the second pole tab to a fan-shaped structure, the second pole tab can fully utilize the internal space of the shell, so that the second pole tab has a larger area to improve the flow capacity between the second pole tab and the shell, so that the battery has better charge and discharge performance.

[0047] According to some embodiments of the present application, along the circumference of the main body, the third surface has a third edge and a fourth edge that are away from each other, and the angle between the third edge and the fourth edge is β2, 0<β2≤180°.

[0048] In the above technical solution, by setting the angle β2 formed between the third edge and the fourth edge of the second pole tab to be less than or equal to 180 degrees, the central angle of the third surface of the fan-shaped second pole tab is less than or equal to 180 degrees, so as to alleviate the phenomenon that the first pole tab and the second pole tab are easily short-circuited due to the excessive space occupied by the second pole tab, thereby making the battery have higher reliability.

[0049] According to some embodiments of the present application, an electrode assembly includes a first electrode piece and a second electrode piece, and the electrode assembly is a wound electrode assembly. The first electrode piece includes a plurality of first sub-electrode tabs, which form a first electrode tab, and the first electrode piece in the innermost n1 turns is not provided with a first sub-electrode tab, where n1 ≥ 1. And / or, the second electrode piece includes a plurality of second sub-electrode tabs, which form a second electrode tab, and the second electrode piece in the innermost n2 turns is not provided with a second sub-electrode tab, where n2 ≥ 1.

[0050] In the above technical solution, by not providing the first sub-tab on the first pole piece of the innermost n1 turn, the first pole tab and the second pole tab can be effectively spaced apart, thereby reducing the risk of shorting between the first and second pole tabs, which is beneficial to improving battery reliability. Similarly, by not providing the second sub-tab on the second pole piece of the innermost n2 turn, the second pole tab and the first pole tab can be effectively spaced apart, thereby reducing the risk of shorting between the second and first pole tabs, which is beneficial to improving battery reliability.

[0051] According to some embodiments of the present application, an electrode assembly includes a first electrode piece and a second electrode piece, and the electrode assembly is a wound electrode assembly. The first electrode piece includes a plurality of first sub-electrode tabs, which form a first electrode tab, and the first electrode piece in the outermost m1 circle is not provided with a first sub-electrode tab, where m1 ≥ 1. And / or, the second electrode piece includes a plurality of second sub-electrode tabs, which form a second electrode tab, and the second electrode piece in the outermost m2 circle is not provided with a second sub-electrode tab, where m2 ≥ 1.

[0052] In the above technical solution, by not providing the first sub-tab on the first electrode piece of the outermost m1 circle, the first electrode tab can be effectively spaced apart from the second wall, thereby reducing the risk of short circuit between the first electrode tab and the second wall, which is beneficial to improving battery reliability. By not providing the second sub-tab on the second electrode piece of the outermost m2 circle, the second electrode tab can be effectively spaced apart from the first wall tab, thereby reducing the risk of damage to the second electrode tab due to interference between the second electrode tab and the second wall when the electrode assembly is placed in the housing, which is beneficial to improving battery reliability.

[0053] In a second aspect, some embodiments of the present application further provide a battery, comprising the battery cell provided in the first aspect.

[0054] In a third aspect, some embodiments of the present application further provide an electrical device, which includes a battery cell as provided in the first aspect, and the battery cell is used to provide electrical energy.

[0055] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0057] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0058] FIG2 is a perspective exploded view of a battery provided in some embodiments of the present application;

[0059] FIG3 is a perspective view of a battery cell in some embodiments of the present application;

[0060] FIG4 is an exploded perspective view of a battery cell in some embodiments of the present application;

[0061] FIG5 is a schematic diagram of an electrode assembly and a first insulating member in some embodiments of the present application;

[0062] FIG6 is a top view of an electrode assembly and a first insulating member in some embodiments of the present application;

[0063] FIG7 is a top view of an electrode assembly and a first insulating member in some embodiments of the present application;

[0064] FIG8 is a perspective view of an electrode terminal, a first insulating member, and a second insulating member in some embodiments of the present application;

[0065] FIG9 is a schematic diagram of the internal structure of a partial battery cell in some embodiments of the present application;

[0066] FIG10 is a top view of an electrode assembly in some other embodiments of the present application;

[0067] FIG11 is a top view of an electrode assembly in some other embodiments of the present application.

[0068] Icons: 100-battery; 10-battery cell; 11-housing; 110-first wall; 111-second wall; 112-electrode terminal; 113-bottom plate; 12-electrode assembly; 120-main body; 1200-first end surface; 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-center through hole; 13-first insulating member; 14-first adapter; 15-second adapter; 16-second insulating member; 160-first surface; 161-insulating member body; 162-partitioning strip; 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 DESCRIPTION

[0069] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0070] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0071] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0072] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0073] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0074] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0075] The term "plurality" used in this application refers to two or more (including two).

[0076] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0077] The battery cells can be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, etc., which are not limited in the embodiments of the present application.

[0078] A battery cell typically includes an electrode assembly. This assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of a battery cell, active ions (such as lithium ions) are inserted and removed between the positive and negative electrodes. The separator, placed between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes while allowing the active ions to pass through.

[0079] 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.

[0080] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is provided on either or both of the two facing surfaces of the positive electrode current collector.

[0081] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, 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. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may 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.).

[0082] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides and their respective modified compounds. However, the present application is not limited to these materials, and other traditional 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. Among them, examples of lithium-containing phosphates may include but are not limited to at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include but are not limited to lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also referred to as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2 (also referred to as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2 (also referred to as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2 (also referred to as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05O2) and at least one of its modified compounds, etc.

[0083] In some embodiments, a positive electrode may be a metal foam. The metal foam may be nickel foam, copper foam, aluminum foam, alloy foam, or carbon foam, among others. When a metal foam is used as the positive electrode, the surface of the metal foam may or may not be provided with a positive electrode active material. For example, a lithium source material, potassium metal, or sodium metal may be filled and / or deposited within the metal foam, where the lithium source material is lithium metal and / or a lithium-rich material.

[0084] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0085] As an example, the negative electrode current collector can be a metal foil, a metal foam, or a composite current collector. For example, as the metal foil, aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium can be used. The metal foam can be nickel foam, copper foam, aluminum foam, alloy foam, or carbon foam. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (copper, 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.).

[0086] 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.

[0087] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is provided on either or both of the two facing surfaces of the negative electrode current collector.

[0088] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells that is well known in the art. 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, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0089] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0090] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0091] In some embodiments, the separator is a separator membrane. There are many types of separator membranes, and any known separator membrane with a porous structure having good chemical stability and mechanical stability can be selected.

[0092] As an example, the separator can be made of at least one of fiberglass, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator can be a single-layer film or a multi-layer composite film. In the case of a multi-layer composite film, the materials of each layer can be the same or different. The separator can be a separate component positioned between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0093] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transport ions and isolate the positive and negative electrodes.

[0094] In some embodiments, the battery cell further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel, or solid. Liquid electrolytes include an electrolyte salt and a solvent.

[0095] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonyl imide, lithium bistrifluoromethanesulfonyl imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium bisoxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0096] In some embodiments, the solvent may include at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methylpropyl carbonate, ethylpropyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent may also be an ether solvent. The ether solvent may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether and crown ether.

[0097] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0098] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0099] As an example, the polymer solid electrolyte may be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, polyionic liquid-lithium salt, cellulose, or the like.

[0100] As an example, the inorganic solid electrolyte may include an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0101] As an example, a composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0102] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0103] In some embodiments, the electrode assembly is provided with tabs that can conduct current from the electrode assembly. The tabs include a positive tab and a negative tab.

[0104] In some embodiments, a battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (e.g., polypropylene), a composite metal housing (e.g., a copper-aluminum composite housing), or an aluminum-plastic film.

[0105] As an example, the battery cells may be cylindrical battery cells or prismatic battery cells.

[0106] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0107] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0108] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are housed in the case.

[0109] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0110] In some embodiments, the battery may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0111] Batteries have outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide adaptability and low self-discharge coefficient. They are an important part of the development of new energy today.

[0112] A battery cell typically includes a housing and an electrode assembly housed within the housing. The electrode assembly includes a main body and tabs mounted on the main body. The tabs are used to output or input electrical energy into or out of the electrode assembly. The tabs include a first tab and a second tab of opposite polarity. The first tab is typically connected to an electrode terminal insulated and mounted on the housing, while the second tab is typically electrically connected to the housing.

[0113] Improving battery reliability is a pressing technical challenge in the development of battery technology. Currently, metal outer casings can easily overlap the first tab, leading to a high risk of internal short circuits in the battery cells and low battery reliability.

[0114] In view of this, in order to improve the problem that the tabs are easily overlapped with the shell, causing internal short circuits in the battery cell and resulting in low battery reliability, some embodiments of the present application provide a battery cell, including a shell, an electrode terminal, an electrode assembly and a first insulating member. The shell has a first wall and a second wall, and the second wall is arranged around the edge of the first wall. The electrode terminal is insulated and installed on the first wall. The electrode assembly is accommodated in the shell, and the electrode assembly includes a main body, a first tab and a second tab. The polarities of the first tab and the second tab are opposite. Along the thickness direction of the first wall, the main body has a first end face close to the first wall. The first tab and the second tab are both arranged on the first end face. The first tab is electrically connected to the electrode terminal, and the second tab is electrically connected to the shell. The first insulating member is arranged on the outer peripheral surface of the main body, and a part 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 insulated and isolated from each other.

[0115] In a battery cell with this structure, by arranging the first and second tabs of the electrode assembly on the same end surface of the main body (i.e., the first end surface), the space occupied by the electrode assembly is reduced, thereby improving the energy density of the battery cell having this 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 outer shell, thereby isolating the first tab from the second wall. This reduces the risk of the first tab overlapping the second wall (i.e., the outer shell of the battery) and causing an internal short circuit in the battery cell, thereby improving the reliability of the battery.

[0116] The electrode assembly disclosed in the embodiments of this application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. A power supply system comprising the battery cells and batteries disclosed in this application can be used to construct such electrical devices. This helps alleviate the problem of internal short circuits in the battery cells caused by overlap between the tabs and the housing, which can lead to low battery reliability.

[0117] The present invention provides an electric device that uses a battery as a power source. The electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0118] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device according to an embodiment of the present application.

[0119] Please refer to Figure 1, which is a schematic diagram of the structure of the vehicle provided in some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000. The battery 100 can be arranged at the bottom of the vehicle 1000, or at the head of the vehicle 1000, or at the tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can be used as an operating power source or a power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0120] In some embodiments of the present application, the battery 100 can not only serve as the operating power source or usage power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0121] Please refer to FIG. 2 and FIG. 3 . FIG. 2 is a three-dimensional exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 includes a box body 20 and a battery cell 10 . The battery cell 10 is used to be accommodated in the box body 20 .

[0122] The housing 20 is used to provide assembly space for the battery cells 10 and can adopt a variety of structures. In some embodiments, the housing 20 can include a first housing body 21 and a second housing body 22. The first housing body 21 and the second housing body 22 cover each other, and the first housing body 21 and the second housing body 22 jointly define an assembly space for accommodating the battery cells 10. The second housing body 22 can be a hollow structure with one end open. The first housing body 21 can be a plate-like structure, and the first housing body 21 covers the open side of the second housing body 22, so that the first housing body 21 and the second housing body 22 jointly define the assembly space. The first housing body 21 and the second housing body 22 can also be hollow structures with one end open, and the open side of the first housing body 21 covers the open side of the second housing body 22.

[0123] Of course, the box body 20 formed by the first box body 21 and the second box body 22 can be in various shapes, such as a cylinder, a cuboid or a cube, etc. For example, in FIG2 , the box body 20 is in the shape of a cuboid.

[0124] In the battery 100, there can be one or more battery cells 10 disposed within the housing 20. When there are multiple battery cells 10 disposed within the housing 20, the multiple battery cells 10 can be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to multiple battery cells 10 being connected both in series and in parallel. Multiple battery cells 10 can be directly connected in series, in parallel, or in a hybrid configuration, and then the entire structure formed by the multiple battery cells 10 is housed within the housing 20. Alternatively, the battery 100 can be constructed by first connecting multiple battery cells 10 in series, in parallel, or in a hybrid configuration to form a battery module, which is then further connected in series, in parallel, or in a hybrid configuration to form a single structure, which is then housed within the housing 20.

[0125] In some embodiments, the battery 100 may further include other structures. For example, the battery 100 may further include a busbar component, which is used to connect the multiple battery cells 10 to achieve electrical connection between the multiple battery cells 10 .

[0126] 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 thereto. The battery cell 10 can be cylindrical, prismatic, or in other shapes. For example, in FIG3 , the battery cell 10 is cylindrical.

[0127] According to some embodiments of the present application, please refer to Figures 3-5. Figure 3 is a three-dimensional diagram of the battery cell 10 in some embodiments of the present application, Figure 4 is a three-dimensional exploded diagram of the battery cell 10 in some embodiments of the present application, and Figure 5 is a schematic diagram of the electrode assembly 12 and the first insulating member 13 in some embodiments of the present application.

[0128] The battery cell 10 includes a shell 11, an electrode terminal 112, an electrode assembly 12, and a first insulating member 13. The shell 11 has a first wall 110 and a second wall 111, and the second wall 111 is arranged around the edge of the first wall 110. The electrode terminal 112 is insulated and mounted on the first wall 110. The electrode assembly 12 is accommodated in the shell 11, and includes a main body 120, a first pole tab 121, and a second pole tab 122. The polarities of the first pole tab 121 and the second pole tab 122 are opposite. Along the thickness direction x of the first wall, the main body 120 has a first end face 1200 close to the first wall 110. The first pole tab 121 and the second pole tab 122 are both arranged on the first end face 1200. The first pole tab 121 is electrically connected to the electrode terminal 112, and the second pole tab 122 is electrically connected to the shell 11. The first insulating member 13 is disposed on the outer circumference of the main body 120 , and a portion of the first insulating member 13 is located between the first electrode tab 121 and the second wall 111 so that the first electrode tab 121 and the second wall 111 are insulated from each other.

[0129] The housing 11 is a component for accommodating the electrode assembly 12. The housing 11 can also be used to accommodate an electrolyte, such as an electrolyte. Referring to Figure 4, in some embodiments, the housing 11 includes a shell and an end cap. A accommodating cavity is formed inside the shell, and the accommodating cavity is used to accommodate the electrode assembly 12. The shell has an opening connected to the accommodating cavity. The end cap is covered at the opening of the shell and forms a sealed connection to form a sealed space for accommodating the electrode assembly 12 and the electrolyte. Optionally, the housing 11 may also include a bottom plate 113, with openings formed at both ends of the shell, one of the openings being closed by the end cap and the other opening being closed by the bottom plate 113.

[0130] In some embodiments, the material of the shell 11 can be metal or a combination of metal and non-metal. For example, the shell 11 can be made of metal, such as aluminum, copper, iron, aluminum, steel or aluminum alloy; for example, part of the shell 11 can be made of metal, and the rest can be made of non-metal, such as the end cover of the shell 11 can be made of metal, and the shell or other parts of the shell 11 can be made of non-metallic materials.

[0131] In some embodiments, when assembling the battery cell 10, the electrode assembly 12 may be placed in the housing first, and the housing is filled with electrolyte, and then the end cap is closed over 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 may be placed in the housing first, and then the end cap is closed over the opening of the housing, and then the housing is filled with electrolyte through the injection hole on the end cap, and then the injection hole is closed to complete the assembly of the battery cell 10.

[0132] The housing 11 may be in various shapes, such as a cylindrical or prismatic structure. The shape of the housing 11 may be determined according to the specific shape of the electrode assembly 12. For example, if the electrode assembly 12 is a cylindrical structure, a cylindrical housing 11 may be selected.

[0133] The first wall 110 is a partial structure of the outer shell 11. The first wall 110 can be insulated and equipped with an electrode terminal 112. The electrode terminal 112 is used to connect to the first electrode tab 121 of the electrode assembly 12. The first wall 110 can be made of a conductive material, such as a metal material. For example, the first wall 110 is made of aluminum, copper, iron, aluminum, steel or aluminum alloy. In some embodiments, the first wall 110 can be electrically connected to the second electrode tab 122 of the electrode assembly 12. In some embodiments, the first wall 110 can be an end cover of the outer shell 11. The second wall 111 is a portion surrounding the edge of the first wall 110. In some embodiments, the first wall 110 is the end cover of the outer shell 11, and the second wall 111 can be the shell of the outer shell 11.

[0134] In some embodiments, the first wall 110 can be connected to the second wall 111 by welding, bonding, clamping or other connection methods. In some embodiments, the first wall 110 and the second wall 111 can be integrally formed.

[0135] The electrode terminal 112 is an insulated component mounted on the first wall 110. The electrode terminal 112 is used to connect to the first electrode tab 121 of the electrode assembly 12, allowing current to flow into or out of the second electrode tab 122 through the electrode terminal 112. In some embodiments, the electrode terminal 112 is made of a metal material, such as aluminum, copper, iron, aluminum, steel, an alloy, or a composite metal.

[0136] In some embodiments, the electrode terminal 112 can be installed on the first wall 110 through an insulating structure. For example, the first wall 110 is formed with a through hole, and the surrounding wall of the electrode terminal 112 is sleeved with an insulating structure, and the insulating structure is arranged between the first wall 110 and the electrode terminal 112.

[0137] It should be noted that the electrode assembly 12 is the component within the battery cell 10 where the electrochemical reaction occurs. The electrode assembly 12 can have various structures. For example, the electrode assembly 12 can be a wound structure formed by winding a positive electrode sheet, a separator, and a negative electrode sheet, with the main body 120 of the electrode assembly 12 being cylindrical. For example, the separator is a separator, the primary material of which can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride.

[0138] Among them, the main body 120 is the area where the electrode assembly 12 undergoes chemical reactions within the battery cell 10. The main body 120 is a structure formed by winding the area of ​​the positive electrode sheet coated with the positive electrode active material layer, the isolation member and the area of ​​the negative electrode sheet coated with the negative electrode active material layer. It mainly works by moving metal ions between the positive electrode sheet and the negative electrode sheet with opposite polarities.

[0139] 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 surface 1200 may be the end surface of the main body 120 facing the first wall 110 , for example, the first end surface 1200 may be the top surface of the main body 120 .

[0140] The first electrode tab 121 and the second electrode tab 122 are both disposed at one end of the main body 120 . That is, the first electrode tab 121 and the second electrode tab 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 .

[0141] The first electrode tab 121 and the second electrode tab 122 are respectively used to output or input the positive and negative electrodes of the electrode assembly 12. If the first electrode tab 121 is used to input or output the positive electrode of the electrode assembly 12, the first electrode tab 121 is formed by laminating and connecting the regions of the positive electrode sheets not coated with the positive electrode active material layer. Correspondingly, if the second electrode tab 122 is used to output or input the negative electrode of the electrode assembly 12, the second electrode tab 122 is formed by laminating and connecting the regions of the negative electrode sheets not coated with the negative electrode active material layer. If the first electrode tab 121 is used to output or input the negative electrode of the electrode assembly 12, the first electrode tab 121 is formed by laminating and connecting the regions of the negative electrode sheets not coated with the negative electrode active material layer. Correspondingly, if the second electrode tab 122 is used to input or output the positive electrode of the electrode assembly 12, the second electrode tab 122 is formed by laminating and connecting the regions of the positive electrode sheets not coated with the positive electrode active material layer. Illustratively, in the embodiment of the present application, the first electrode tab 121 is used to output or input the positive electrode of the electrode assembly 12 , and the second electrode tab 122 is used to output or input the negative electrode of the electrode assembly 12 .

[0142] “The first pole tab 121 is electrically connected to the electrode terminal 112” can be understood as the direct or indirect connection between the first pole tab 121 and the electrode terminal 112 to achieve electrical connection between the first pole tab 121 and the electrode terminal 112. For example, in some embodiments, the first pole tab 121 is directly welded to the electrode terminal 112; in some embodiments, the first pole tab 121 is connected to the electrode terminal 112 through the first adapter 14, wherein the first pole tab 121 and the electrode terminal 112 can be respectively welded to the first adapter 14.

[0143] The phrase "the second tab 122 is electrically connected to the housing 11" can be understood as meaning that the second tab 122 is directly or indirectly connected to the housing 11 to achieve electrical connection between the second tab 122 and the housing 11. For example, in some embodiments, the second tab 122 is directly connected to the first wall 110 of the housing 11; in some embodiments, the second tab 122 is connected to the second wall 111 of the housing 11; and in some embodiments, the second tab 122 is connected to the housing 11 via the second adapter 15. For example, the second tab 122 and the first wall 110 can be welded to the second adapter 15, respectively.

[0144] 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 pole tab 121 and the second wall 111. The first insulating member 13 has insulating properties, and the first insulating member 13 is used to insulate and isolate the first pole tab 121 and the second wall 111, so as to reduce the risk of the first pole tab 121 and the second wall 111 overlapping each other and causing an internal short circuit in the battery cell 10. In some embodiments, the first insulating member 13 may be in the shape of a sheet, a plate, or a ring. In some embodiments, the first insulating member 13 may be a rubber member, a silicone member, or a plastic member. In some embodiments, the first insulating member 13 is made of an insulating material, such as polypropylene, polyethylene, or other materials with insulating properties.

[0145] “A portion of the first insulating member 13 is located between the first pole tab 121 and the second wall 111” can be understood as that 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 pole tab 121 and the second wall 111 to insulate and isolate the first pole tab 121 and the second wall 111; it can also be understood as that the first insulating member 13 is disposed on the outer periphery of the electrode assembly 12, and is partially located between the first pole tab 121 and the second wall 111 to be able to insulate and isolate the first pole tab 121 and the second wall 111. For example, referring to FIG8 , 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 pole tab 121 and the second wall 111 to insulate and isolate the first pole tab 121 and the second wall 111, and the remaining portion of the first insulating member 13 is disposed on other structures of the battery cell 10.

[0146] In the above technical solution, by arranging the first tab 121 and the second tab 122 of the electrode assembly 12 on the same end surface of the main body 120 (i.e., the first end surface 1200), the space occupied by the electrode assembly 12 in the thickness direction x of the first wall is reduced, thereby improving the energy density of the battery cell 10 having such an electrode assembly 12. The battery cell 10 further includes a first insulating member 13, a portion of which is located between the first tab 121 and the second wall 111 of the outer shell 11, thereby isolating the first tab 121 from the second wall 111. This reduces the risk of the first tab 121 overlapping the second wall 111 (i.e., the outer shell 11 of the battery 100), thereby reducing the risk of internal short circuits in the battery cell 10 caused by the first tab 121 contacting the second wall 111, thereby improving the reliability of the battery 100.

[0147] According to some embodiments of the present application, see Figures 5 and 6. Figure 6 is a top view of the electrode assembly 12 and the first insulating member 13 in some embodiments of the present application. Along the circumferential direction y of the main body, the central angle corresponding to the first insulating member 13 is α1, and α1<360°.

[0148] In some embodiments, the first insulating member 13 is disposed on the outer periphery of the main body 120 and extends along the circumferential direction y of the main body. The phrase "along the circumferential direction y of the main body, the central angle corresponding to the first insulating member 13 is α1, where α1 is less than 360°" can be understood as meaning that the first insulating member 13 does not completely encircle the main body 120, that is, the first insulating member 13 only encloses a portion of the main body 120 along the circumferential direction y, rather than the entire circumferential direction. Alternatively, the phrase "along the axial direction of the main body 120, the first insulating member 13 has two edges that are spaced apart from each other, with the angle between the two edges being α1 ... entirely encircle the main body 120, that is, the first insulating member 13 only encloses a portion of the main body 120 along the circumferential direction y, rather than the entire circumferential direction.

[0149] 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.

[0150] In some embodiments, along the circumferential direction y of the main body, the first electrode tab 121 and the second electrode tab 122 may be spaced apart. For example, the surface of the first electrode tab 121 facing the first wall 110 is fan-shaped, and the fan-shaped surface is concentric with the first end surface 1200. Due to the presence of the second electrode 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 separate the first electrode tab 121 from the second wall 111. The first insulating member 13 is arranged corresponding to the central angle of the first electrode tab 121. Due to the presence of the second electrode tab 122, the first insulating member 13 does not need to be arranged 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°.

[0151] In the above technical solution, by setting the central angle α1 corresponding to the first insulating member 13 to be less than 360°, that is, the first insulating member 13 does not need to cover the outer circumference of the main body 120, and the first insulating member 13 plays the role of insulating and isolating the first pole ear 121 and the second wall 111, the material used in the first insulating member 13 is reduced, which saves the production cost of the battery cell 10, and thus reduces the manufacturing cost of the battery 100.

[0152] In some other embodiments, along the circumferential direction y of the main body, the central angle α1 corresponding to the first insulating member 13 may be greater than or equal to 360°. For example, the first insulating member 13 may be disposed around the outer circumference of the main body 120 for at least one circle.

[0153] According to some embodiments of the present application, referring to FIG. 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 tab 121 is α2, satisfying α1>α2.

[0154] In some embodiments, the first insulating member 13 is disposed on the outer periphery of the main body 120 and extends along the circumferential direction y of the main body. Along the circumferential direction y of the main body, the first insulating member 13 corresponds to a central angle α1. Alternatively, along the axial direction of the main body 120, the first insulating member 13 has two edges that are spaced apart from each other, and the angle between the two edges is α1.

[0155] Along the circumferential direction y of the main body, the central angle corresponding to the first electrode tab 121 is α2. The first electrode tab 121 may have two edges that are separated from each other in the circumferential direction y of the main body, and the angle between the two edges is α2. Exemplarily, the first electrode tab 121 has a second surface 1211 facing the first wall 110. The second surface 1211 is fan-shaped. 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 separated from each other. The angle between the first edge 12110 and the second edge 12111 is α2.

[0156] "α1>α2" can be understood as meaning that 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, that is, in the circumferential direction y of the main body, the first insulating member 13 can completely cover the first electrode tab 121, that is, in the circumferential direction y of the main body, the two ends of the first insulating member 13 that are separated from each other respectively exceed the two ends of the first electrode tab 121 that are separated from each other. Alternatively, it can be understood that in the circumferential direction y of the main body, the size of the first insulating member 13 is greater than the size of the first electrode tab 121, so that the first insulating member 13 can effectively insulate and isolate the first electrode tab 121 from the second wall 111.

[0157] 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 pole 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 pole 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 pole tab 121 can be 270°.

[0158] 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 pole lug 121, the first insulating member 13 can effectively insulate and isolate the first pole lug 121 from the second wall 111, thereby increasing the creepage distance between the first pole lug 121 and the second wall 111, thereby reducing the risk of internal short circuit of the battery cell 10, and thus making the battery 100 have higher reliability.

[0159] According to some embodiments of the present application, referring to FIG. 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 tab 122 is α3, satisfying α1+α3<360°.

[0160] In some embodiments, the first insulating member 13 is disposed on the outer periphery of the main body 120 and extends along the circumferential direction y of the main body. Along the circumferential direction y of the main body, the first insulating member 13 corresponds to a central angle α1. Alternatively, along the axial direction of the main body 120, the first insulating member 13 has two edges that are spaced apart from each other, and the angle between the two edges is α1.

[0161] Along the circumferential direction y of the main body, the central angle corresponding to the second electrode tab 122 is α3. The second electrode tab 122 may have two edges that are separated from each other in the circumferential direction y of the main body, and the angle between the two edges is α3. Exemplarily, the second electrode tab 122 has a third surface 1221 facing the first wall 110. The third surface 1221 is fan-shaped. 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 separated from each other. The angle between the third edge 12210 and the fourth edge 12211 is α3.

[0162] “α1+α3<360°” can be understood as that the sum of the central angles of the first insulating member 13 and the second pole tab 122 is less than 360°, that is, 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 direction y of the main body.

[0163] For example, in some embodiments, the central angle of the second pole tab 122 may be 150°, the central angle of the first pole tab 121 may be 120°, and the central angle of the first insulating member 13 may be 130°; the central angle of the second pole tab 122 may be 180°, the central angle of the first pole tab 121 may be 170°, and the central angle of the first insulating member 13 may be 175°.

[0164] 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 pole ear 122 to less than 360°, the first insulating member 13 can reduce the material used for the first insulating member 13 while insulating and isolating the first pole ear 121 and the second wall 111, thereby achieving the purpose of saving the production cost of the battery cell 10, and further reducing the production cost of the battery 100.

[0165] According to some embodiments of the present application, please refer to Figure 7, which is a top view of the electrode assembly 12 and the first insulating member 13 in some embodiments of the present application. Along the circumferential direction y of the main body, the first insulating member 13 does not surround the second electrode tab 122.

[0166] In some embodiments, "along the circumferential direction y of the main body, the first insulating member 13 does not surround the second electrode tab 122" can be understood to mean that the second electrode tab 122 may not be disposed between the second electrode tab 122 and the second wall 111. In some embodiments, it can also be understood to mean that along any ray direction emitted from and perpendicular to the central axis of the main body 120, the orthographic projection of the first insulating member 13 does not overlap with the orthographic projection of the second electrode tab 122.

[0167] “Any ray direction emitted from the central axis of the main body 120 and perpendicular to the central axis of the main body 120” can be understood as the direction of a ray that is emitted outward and perpendicular to the central axis of the main body 120, starting from the central axis of the main body 120. For example, in FIG7 , two rays N1 and N2 are shown that are emitted in different directions and meet the requirement of “any ray direction emitted from the central axis of the main body 120 and perpendicular to the central axis of the main body 120”. For example, in some embodiments, when the main body 120 is cylindrical, the “any ray direction emitted from the central axis of the main body 120 and perpendicular to the central axis of the main body 120” mentioned above is a direction parallel to the radial direction of the first end face 1200 of the main body 120, and has a single emission direction.

[0168] “Along any ray direction emitted from the central axis of the main body 120 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 pole lug 122 do not overlap” can be understood as, in the line of sight parallel to the arbitrary ray direction, only one of the first insulating member 13 and the second pole lug 122 can be seen. For example, if you stand at the center of the first end face 1200, observe outward and see through, you can only see one of the first insulating member 13 and the second pole lug 122, but not both at the same time.

[0169] For example, referring to FIG7 , 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 respect to the first end face 1200. The first insulating member 13 is an arc-shaped sheet-like structure disposed on the outer periphery of the main body 120. The first insulating member 13 can cover the first tab 121 but not the second tab 122.

[0170] In the above technical solution, along the circumferential direction y of the main body, by arranging the first insulating member 13 not surrounding the second pole lug 122, the first insulating member 13 can be arranged not corresponding to the second pole lug 122 under the condition of effectively insulating and isolating the first pole lug 121 and the second wall 111, that is, the second pole lug 122 can be not arranged between the second pole lug 122 and the second wall 111, thereby effectively reducing the material usage of the first insulating member 13 and further reducing the manufacturing cost of the battery 100.

[0171] According to some embodiments of the present application, please refer to Figures 4, 8, and 9. Figure 8 is a perspective view of the electrode terminal 112, the first insulating member 13, and the second insulating member 16 in some embodiments of the present application, and Figure 9 is an internal schematic diagram of a partial structure of the battery cell 10 in some embodiments of the present application.

[0172] The battery cell 10 further includes a first adapter 14 and a second adapter 15. The first adapter 14 connects the first tab 121 and the electrode terminal 112. The second insulating member 16 is disposed between the first adapter 14 and the housing 11 to insulate and isolate the first adapter 14 from the housing 11.

[0173] 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. For example, the material of the first adapter 14 can be aluminum, copper, iron, aluminum, steel, or an 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.

[0174] The connection between the first adapter 14 and the first tab 121 includes, but is not limited to, welding, bonding, clamping, or connection via other connecting members. The connection between the first adapter 14 and the electrode terminal 112 includes, but is not limited to, welding, bonding, clamping, or connection via other connecting members.

[0175] The second insulating member 16 is disposed between the first adapter 14 and the housing 11. The second insulating member 16 has insulating properties, isolating the housing 11 from the first adapter 14. In some embodiments, the second insulating member 16 may be in the form of a sheet, plate, or ring. 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 an insulating material, such as polypropylene, polyethylene, or other insulating material.

[0176] 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. For example, the battery cell 10 further includes a second adapter 15 that connects the second tab 122 to the first wall 110. The second insulating member 16 includes an insulating member body 161 and a separator 162. The insulating member body 161 is annular and disposed on the first end surface 1200. The first and second tabs 121 and 122 support the lower surface of the insulating member body 161 (in some other embodiments, the insulating member body 161 may be supported on the first end surface 1200, with the first and second tabs 121 and 122 located within the insulating member body 161). The upper surface of the insulating member body 161 faces the first wall 110. The separator 162 is disposed within the insulating member body 161, dividing the interior space of the insulating member body 161 into two subspaces, one of which accommodates the first adapter 14 and the other 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 second insulating member 16 functions to insulate and isolate the first adapter 14 from the second adapter 15 , to insulate and isolate the first adapter 14 from the first wall 110 , and to insulate and isolate the first adapter 14 from the second wall 111 .

[0177] In the above technical solution, by providing a first adapter 14 to connect the first tab 121 and the electrode terminal 112, the difficulty of connecting the first tab 121 and the electrode terminal 112 can be reduced, thereby improving the manufacturing efficiency of the battery cell 10. A second insulating member 16 is provided between the first adapter 14 and the outer shell 11 to insulate and isolate the first adapter 14 from the outer shell 11, thereby increasing the creepage distance between the first adapter 14 and the outer shell 11, thereby reducing the risk of internal short circuits in the battery cell 10 and ensuring higher reliability of the battery 100.

[0178] According to some embodiments of the present application, referring to FIG. 8 and FIG. 9 , the first insulating member 13 is connected to the main body 120 and the second insulating member 16 .

[0179] In some embodiments, the first insulating member 13 extends along the circumferential direction y of the main body, and the thickness direction x of the first wall can be parallel to the width direction of the first insulating member 13. "The first insulating member 13 is connected to the main body 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 can include three parts, one of which is connected to the main body 120, a second part can be located between the second insulating member 16 and the main body 120 to insulate and isolate the first electrode tab 121 from the second wall 111, and the remaining part is connected to the second insulating member 16.

[0180] In some embodiments, the connection between the first insulating member 13 and the main body 120 includes, but is not limited to, bonding, welding, or bundling, among other connection methods. The connection between the first insulating member 13 and the second insulating member 16 includes, but is not limited to, bonding, welding, or bundling, among other connection methods. In some embodiments, the first insulating member 13 may directly contact the surface of the second insulating member 16.

[0181] 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 pole ear 121 and the second wall 111, reducing the risk of internal short circuit of the battery cell 10 caused by overlapping of the first pole ear 121 and the outer shell 11, thereby making the battery 100 have higher reliability.

[0182] In some other embodiments, the first insulating member 13 may not be connected to the second insulating member 16 .

[0183] According to some embodiments of the present application, referring to FIG. 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 electrode tab 121 , and along the direction of the main body 120 pointing to the first wall 110 , the first insulating member 13 extends beyond the first surface 160 .

[0184] The first surface 160 is the surface of the second insulating member 16 that faces the electrode assembly 12 in the thickness direction x of the first wall. For example, 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 electrode tab 121.

[0185] 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 meaning that the first insulating member 13 extends beyond the first surface 160 in the direction from the main body 120 to the first wall 110. In other words, 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. It can also be understood that the second tab 122, which is located below the first surface 160, is further below the surface of the first insulating member 13 facing the first wall 110.

[0186] 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 pole ear 121 and the second wall 111 can be effectively increased, and the risk of overlap between the first pole ear 121 and the second wall 111 can be effectively reduced, thereby reducing the risk of internal short circuit of the battery cell 10, thereby making the battery 100 have higher reliability.

[0187] According to some embodiments of the present application, along the direction from the main body 120 to the first wall 110 , the first insulating member 13 extends beyond the first surface 160 by a dimension h1 , satisfying h1 ≥ 0.5 mm.

[0188] "A dimension h1 extending from the first surface 160 of the first insulating member 13 along the direction from the main body 120 to the first wall 110" can be understood as a dimension h1 extending from the first tab 121 of the first insulating member 13 along the direction from the main body 120 to the first wall 110. In some embodiments, h1 can be greater than or equal to 0.5 mm, for example, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, or a greater value.

[0189] 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 pole ear 121 in the direction of the main body 120 pointing to the first wall 110, effectively increase the creepage distance between the first pole ear 121 and the second wall 111, and effectively reduce the risk of overlap between the first pole ear 121 and the second wall 111, thereby reducing the risk of internal short circuit of the battery cell 10, and thus making the battery 100 have higher reliability.

[0190] According to some embodiments of the present application, h1≥1.5 mm is satisfied.

[0191] In some embodiments, h1 may be a value greater than or equal to 1.5 mm. For example, h1 may be 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, or a greater value.

[0192] 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 1.5 mm, on the one hand, the connection between the first insulating member 13 and the second insulating member 16 can be made firm, and on the other hand, the first insulating member 13 can effectively cover the first pole ear 121 in the direction of the main body 120 pointing to the first wall 110, effectively increasing the creepage distance between the first pole ear 121 and the second wall 111, and effectively reducing the risk of overlap between the first pole ear 121 and the second wall 111, thereby reducing the risk of internal short circuit of the battery cell 10, and thus making the battery 100 have higher reliability.

[0193] According to some embodiments of the present application, along the direction from the first wall 110 to the main body 120 , the first insulating member 13 extends beyond the first end surface 1200 .

[0194] The first end surface 1200 is the end surface of the main body 120 on which the first electrode tab 121 and the second electrode tab 122 are disposed. In some embodiments, the main body 120 faces the side of the first wall 110, and the end surface formed by the end of the separator of the electrode assembly 12 facing the first wall 110 can be the first end surface 1200. The phrase "the first insulating member 13 extends beyond the first end surface 1200 along the direction from the first wall 110 toward the main body 120" can be understood as meaning that the first insulating member 13 extends beyond the end of the separator of the electrode assembly 12 facing the first wall 110 along the direction from the first wall 110 toward the main body 120; it can also be understood as meaning that the first insulating member 13 extends beyond the root of the first electrode tab 121 along the direction from the first wall 110 toward the main body 120. The root of the first electrode tab 121 can be understood as the area where the first electrode tab 121 and the main body 120 intersect.

[0195] In the above technical solution, by setting the insulating part to extend beyond the first end face 1200, the creepage distance between the first pole ear 121 and the second wall 111 can be effectively increased, and the risk of overlap between the first pole ear 121 and the second wall 111 can be effectively reduced, thereby reducing the risk of internal short circuit of the battery cell 10, thereby making the battery 100 have higher reliability.

[0196] According to some embodiments of the present application, along the direction from the first wall 110 to the main body 120 , the first insulating member 13 extends beyond the first end surface 1200 by a dimension h2 , satisfying h2 ≥ 0.5 mm.

[0197] The phrase "a dimension h2 extending from the first end surface 1200 of the first insulating member 13 along the direction from the first wall 110 to the main body 120" can be understood as a dimension h2 extending from the first end surface 1200 of the first insulating member 13 along the direction from the first wall 110 to the main body 120. In some embodiments, h2 can be greater than or equal to 0.5 mm, for example, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, or a greater value.

[0198] 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 0.5 mm, the first insulating member 13 can effectively cover the first pole ear 121 in the direction from the first wall 110 to the main body 120, effectively increase the creepage distance between the first pole ear 121 and the second wall 111, and effectively reduce the risk of overlap between the first pole ear 121 and the second wall 111, thereby reducing the risk of internal short circuit of the battery cell 10, and thus making the battery 100 have higher reliability.

[0199] According to some embodiments of the present application, h2≥1.5 mm is satisfied.

[0200] In some embodiments, h2 may be greater than or equal to 1.5 mm. For example, h2 may be 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, or a greater value.

[0201] 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 1.5 mm, on the one hand, the connection between the first insulating member 13 and the main body 120 can be made firm, and on the other hand, the first insulating member 13 can effectively cover the first pole ear 121 in the direction from the first wall 110 to the main body 120, effectively increasing the creepage distance between the first pole ear 121 and the second wall 111, and effectively reducing the risk of overlap between the first pole ear 121 and the second wall 111, thereby reducing the risk of internal short circuit of the battery cell 10, and thus making the battery 100 have higher reliability.

[0202] In some embodiments, the periphery of the electrode assembly 12 may be wrapped with an insulating film 17, which may be wrapped around the periphery of the main body 120 to insulate the main body 120 from the second wall 111. Referring to FIG. 9 , in the thickness direction x of the first wall, the first insulating member 13 is located on a side of the insulating film 17 that is closer to the first wall 110.

[0203] According to some embodiments of the present application, the thickness of the first insulating member 13 is T, and T≥30 μm.

[0204] The thickness of the first insulating member 13 may refer to the thickness of the first insulating member 13 under unstressed conditions when the first insulating member 13 is not installed between the first tab 121 and the second wall 111. The thickness of the first insulating member 13 may also refer to the thickness of the first insulating member 13 after being compressed and deformed when the first insulating member 13 is installed between the first tab 121 and the second wall 111. The thickness of the first insulating member 13 may also refer to the thickness of the first insulating member 13 when the first insulating member 13 is installed between the first tab 121 and the second wall 111 and removed from the battery cell 10, as measured using a thickness gauge.

[0205] In some embodiments, the thickness T of the first insulating member 13 may be greater than or equal to 30 μm, for example, T may be 30 μm, 31 μm, 32 μm, 33 μm, 34 μm, 35 μm or greater.

[0206] In the above technical solution, by setting the thickness T of the first insulating member 13 to be greater than or equal to 30 μm, the risk of the first insulating member 13 being broken or punctured can be reduced, the insulating isolation effect of the first insulating member 13 can be improved, and the risk of internal short circuit of the battery cell 10 due to the overlap of the first tab 121 and the second wall 111 can be reduced, so that the battery 100 has higher reliability.

[0207] According to some embodiments of the present application, the electrode assembly 12 is a wound electrode assembly 12, and the first electrode tab 121 includes a plurality of first sub-electrode tabs 1210, each of which has the same size in the winding direction of the electrode assembly 12. Alternatively, along the direction from the inner circle to the outer circle of the electrode assembly 12, the sizes of the plurality of first sub-electrode tabs 1210 in the winding direction of the electrode assembly 12 gradually increase.

[0208] The electrode assembly 12 is a wound electrode assembly, and the electrode assembly 12 includes a first electrode plate and a second electrode plate with opposite polarities and a separator. The first electrode plate, the second electrode plate and the separator are stacked and wound around a winding axis.

[0209] The wound electrode assembly 12 includes multiple turns of the first electrode sheet, and the first electrode tab 121 includes multiple first sub-electrode tabs 1210. The number of the first sub-electrode tabs 1210 can be equal to the number of turns of the first electrode sheet or less than the number of turns of the first electrode sheet.

[0210] "Each first sub-electrode tab 1210 has the same size in the winding direction of the electrode assembly 12" can be understood as adjacent first sub-electrode tabs 1210 having the same size in the winding direction, so that the first electrode tab 121 has a regular shape, for example, the first electrode tab 121 is square, or the first electrode tab 121 is approximately square. For example, see Figure 10, which is a top view of the electrode assembly 12 in other embodiments of the present application. Each first sub-electrode tab 1210 has the same size in the winding direction of the electrode assembly 12, and the surface of the first electrode tab 121 is square, or approximately square.

[0211] The phrase "along the direction from the inner ring to the outer ring of the electrode assembly 12, the sizes of the plurality of first sub-tabs 1210 in the winding direction of the electrode assembly 12 gradually increase" can be understood as meaning that, along two adjacent first sub-tabs 1210, the size of the first sub-tab 1210 in the inner ring in the winding direction is smaller than the size of the first sub-tab 1210 in the outer ring. For example, referring to FIG11 , which is a top view of the electrode assembly 12 in some other embodiments of the present application, the sizes of the plurality of first sub-tabs 1210 in the winding direction of the electrode assembly 12 gradually increase along the direction from the inner ring to the outer ring of the electrode assembly 12, and the surface of the first tab 121 is fan-shaped, or approximately fan-shaped.

[0212] In the above technical solution, in some embodiments, by setting the dimensions of each first sub-tab 1210 in the winding direction of the electrode assembly 12 to be the same, the processing difficulty of the first sub-tab 1210 can be reduced (for example, when die-cutting the tab, each first sub-tab 1210 has the same die-cut dimensions, thereby improving die-cutting efficiency), thereby improving the manufacturing efficiency of the battery 100. In some embodiments, by setting the dimensions of the plurality of first sub-tabs 1210 in the winding direction of the electrode assembly 12 to gradually increase from the inner circumference to the outer circumference, the first tab 121 can fully utilize the internal space of the housing 11, thereby providing the first tab 121 with a larger area, thereby improving the flow capacity between the first tab 121 and the electrode terminal 112, and thus improving the charge and discharge performance of the battery 100.

[0213] According to some embodiments of the present application, the electrode assembly 12 is a wound electrode assembly 12, and the second electrode tab 122 includes a plurality of second sub-electrode tabs 1220, each of which has the same size in the winding direction of the electrode assembly 12. Alternatively, along the direction from the inner circle to the outer circle of the electrode assembly 12, the sizes of the plurality of second sub-electrode tabs 1220 in the winding direction of the electrode assembly 12 gradually increase.

[0214] The electrode assembly 12 is a wound electrode assembly 12 , which includes a first electrode sheet and a second electrode sheet with opposite polarities and a separator. The first electrode sheet, the second electrode sheet and the separator are stacked and wound around a winding axis.

[0215] The wound electrode assembly 12 includes multiple turns of the second electrode sheet, and the second electrode tab 122 includes multiple second sub-electrode tabs 1220. The number of the second sub-electrode tabs 1220 can be equal to the number of turns of the second electrode sheet or less than the number of turns of the second electrode sheet.

[0216] “Each second sub-electrode tab 1220 has the same size in the winding direction of the electrode assembly 12” can be understood as adjacent second sub-electrode tabs 1220 have the same size in the winding direction, so that the second electrode tab 122 has a regular shape, for example, the second electrode tab 122 is square, or the second electrode tab 122 is approximately square.

[0217] The phrase "the dimensions of the plurality of second sub-electrode tabs 1220 gradually increase in the winding direction of the electrode assembly 12, along the direction from the inner circumference toward the outer circumference" can be understood as meaning that, along two adjacent second sub-electrode tabs 1220, the dimension of the second sub-electrode tab 1220 located on the inner circumference, along the winding direction, is smaller than the dimension of the second sub-electrode tab 1220 located on the outer circumference. For example, in Figures 10 and 11, the dimensions of the plurality of first sub-electrode tabs 1210 gradually increase in the winding direction of the electrode assembly 12, along the direction from the inner circumference toward the outer circumference, and the surface of the first electrode tab 121 is fan-shaped, or approximately fan-shaped.

[0218] In the above technical solution, in some embodiments, by setting the dimensions of each second sub-tab 1220 in the winding direction of the electrode assembly 12 to be the same, the processing difficulty of the second sub-tab 1220 can be reduced (for example, when die-cutting the tab, each second sub-tab 1220 has the same die-cut dimensions, thereby improving the die-cutting efficiency), thereby improving the manufacturing efficiency of the battery 100. In some embodiments, along the direction from the inner circle to the outer circle of the electrode assembly 12, by setting the dimensions of the plurality of second sub-tabs 1220 in the winding direction of the electrode assembly 12 to gradually increase, the second tab 122 can fully utilize the internal space of the outer shell 11, so that the second tab 122 has a larger area, thereby improving the flow capacity between the second tab 122 and the outer shell 11, and thus the battery 100 has better charge and discharge performance.

[0219] According to some embodiments of the present application, please refer to Figure 11, which is a top view of the electrode assembly 12 in some embodiments of the present application. The first electrode tab 121 has a second surface 1211 facing the first wall 110, and the second surface 1211 is fan-shaped.

[0220] The second surface 1211 is the surface of the first electrode tab 121 facing the first wall 110 . In some embodiments, the second surface 1211 is the surface electrically connected to the electrode terminal 112 . For example, the second surface 1211 is electrically connected to the electrode terminal 112 by being connected to the first adapter 14 .

[0221] “The second surface 1211 is fan-shaped” can be understood as that the second surface 1211 extends 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 with the center of the first end face 1200 as the center of the circle.

[0222] The center of the sector-shaped second surface 1211 may or may not be located on the central axis of the main body 120. For example, in FIG11 , the center of the sector-shaped second surface 1211 is located on the central axis of the main body 120.

[0223] In the above technical solution, by setting the second surface 1211 of the first pole tab 121 to a fan-shaped structure, the first pole tab 121 can fully utilize the internal space of the shell 11, so that the first pole tab 121 has a larger area to improve the flow capacity between the first pole tab 121 and the electrode terminal 112, so that the battery 100 has better charge and discharge performance.

[0224] According to some embodiments of the present application, referring to FIG. 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 away from each other, and the angle between the first edge 12110 and the second edge 12111 is β1, 0<β1≤270°.

[0225] In some embodiments, the arc-shaped 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 .

[0226] The first edge 12110 and the second edge 12111 are two edges of the second surface 1211 that are away from each other on its arc-shaped trajectory. The angle between the first edge 12110 and the second edge 12111 may correspond to the central angle of the fan-shaped second surface 1211 .

[0227] 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.

[0228] In the above technical solution, by setting the angle β1 formed between the first edge 12110 and the second edge 12111 of the first pole tab 121 to be less than or equal to 270 degrees, the central angle of the second surface 1211 of the fan-shaped first pole tab 121 is less than or equal to 270 degrees, thereby alleviating the phenomenon that the first pole tab 121 and the second pole tab 122 are easily short-circuited due to the space occupied by the first pole tab 121 being too large, thereby making the battery 100 have higher reliability.

[0229] According to some embodiments of the present application, referring to FIG. 11 , the second electrode tab 122 has a third surface 1221 facing the first wall 110 , and the third surface 1221 is fan-shaped.

[0230] 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 of the second tab 122 electrically connected to the housing 11 . For example, the third surface 1221 is electrically connected to the first wall 110 by being connected to the second adapter 15 .

[0231] “The third surface 1221 is fan-shaped” can be understood as that the third surface 1221 extends 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 with the first end face 1200 as the center of the circle.

[0232] The center of the fan-shaped third surface 1221 may be located on the central axis of the main body 120 or not. For example, in FIG11 , the center of the fan-shaped third surface 1221 is located on the central axis of the main body 120.

[0233] In the above technical solution, by setting the third surface 1221 of the second pole tab 122 to a fan-shaped structure, the second pole tab 122 can fully utilize the internal space of the shell 11, so that the second pole tab 122 has a larger area to improve the flow capacity between the second pole tab 122 and the shell 11, so that the battery 100 has better charge and discharge performance.

[0234] According to some embodiments of the present 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 away from each other, and the angle between the third edge 12210 and the fourth edge 12211 is β2, 0<β2≤180°.

[0235] In some embodiments, the arc-shaped 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 can be located on the central axis of the main body 120 .

[0236] The third edge 12210 and the fourth edge 12211 are two edges of the third surface 1221 that are away from each other on its arc-shaped trajectory. The angle between the third edge 12210 and the fourth edge 12211 may correspond to the central angle of the fan-shaped third surface 1221 .

[0237] 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.

[0238] In the above technical solution, by setting the angle β2 formed between the third edge 12210 and the fourth edge 12211 of the second pole tab 122 to be less than or equal to 180 degrees, the central angle of the third surface 1221 of the fan-shaped second pole tab 122 is less than or equal to 180 degrees, thereby alleviating the phenomenon that the first pole tab 121 and the second pole tab 122 are easily short-circuited due to the excessive space occupied by the second pole tab 122, thereby making the battery 100 have higher reliability.

[0239] According to some embodiments of the present application, the electrode assembly 12 includes a first electrode sheet and a second electrode sheet, and the electrode assembly 12 is a wound electrode assembly 12. The first electrode sheet includes a plurality of first sub-electrode tabs 1210, which form a first electrode tab 121. The first electrode sheet in the innermost n1 turns is not provided with a first sub-electrode tab 1210, where n1 ≥ 1. And / or, the second electrode sheet includes a plurality of second sub-electrode tabs 1220, which form a second electrode tab 122. The second electrode sheet in the innermost n2 turns is not provided with a second sub-electrode tab 1220, where n2 ≥ 1.

[0240] The electrode assembly 12 is a wound electrode assembly, which includes a first electrode plate and a second electrode plate with opposite polarities and an isolation membrane. The first electrode plate, the second electrode plate and the isolation membrane are stacked and wound around the winding axis, and a central through hole 123 is formed in the center of the main body 120 and passes through the main body 120.

[0241] In some embodiments, the wound electrode assembly 12 includes multiple turns of a 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 less than the number of turns of the first electrode sheet. For example, the first electrode sheet of the innermost n1 turns is not provided with a first sub-electrode tab 1210, such as the first electrode sheet of the innermost first and second turns is not provided with a first sub-electrode tab 1210, so that a certain distance exists 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 first electrode sheet of the innermost 1 turn, the innermost 2 turns, the innermost 3 turns, the innermost 4 turns, or the innermost more turns is not provided with a first sub-electrode tab 1210. As shown in FIG. 11, there is a certain distance between the edge of the first electrode tab 121 closest to the central through hole 123 and the central through hole 123.

[0242] In some embodiments, the wound electrode assembly 12 includes multiple turns of a second electrode sheet, 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 sheet. For example, the second electrode sheet of the innermost n2 turns is not provided with a second sub-electrode tab 1220, such as the second electrode sheet of the innermost first and second turns is not provided with a second sub-electrode tab 1220, so that there is a certain distance between the second electrode tab 122 and the central through hole 123. The value of n2 can be 1 or an integer greater than 1, for example, the second electrode sheet of the innermost 1 turn, the innermost 2 turns, the innermost 3 turns, the innermost 4 turns, or the innermost more turns is not provided with a second sub-electrode tab 1220. As shown in Figure 11, there is a certain distance between the edge of the second electrode tab 122 closest to the central through hole 123 and the central through hole 123.

[0243] In the above technical solution, by not providing the first sub-tab 1210 on the first pole piece of the innermost n1 turn, the first pole tab 121 and the second pole tab 122 can be effectively spaced apart, thereby reducing the risk of short circuit between the first pole tab 121 and the second pole 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 pole piece of the innermost n2 turn, the second pole tab 122 and the first pole tab 121 can be effectively spaced apart, thereby reducing the risk of short circuit between the second pole tab 122 and the first pole tab 121, which is beneficial to improving the reliability of the battery 100.

[0244] According to some embodiments of the present application, the electrode assembly 12 includes a first electrode sheet and a second electrode sheet, and the electrode assembly 12 is a wound electrode assembly 12. The first electrode sheet includes a plurality of first sub-electrode tabs 1210, which form a first electrode tab 121. The first electrode sheet in the outermost m1 circle is not provided with a first sub-electrode tab 1210, and m1 ≥ 1. And / or, the second electrode sheet includes a plurality of second sub-electrode tabs 1220, which form a second electrode tab 122. The second electrode sheet in the outermost m2 circle is not provided with a second sub-electrode tab 1220, and m2 ≥ 1.

[0245] The electrode assembly 12 is a wound electrode assembly, and the electrode assembly 12 includes a first electrode plate and a second electrode plate with opposite polarities and a separator. The first electrode plate, the second electrode plate and the separator are stacked and wound around a winding axis.

[0246] In some embodiments, the wound electrode assembly 12 includes multiple turns of a 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 less than the number of turns of the first electrode sheet. For example, the first electrode sheet of the outermost m1 turn is not provided with a first sub-electrode tab 1210, such as the first electrode sheet of the outermost first and second turns is not provided with a first sub-electrode tab 1210, so that there is a certain distance between the first electrode tab 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 first electrode sheet of the outermost 1 turn, the outermost 2 turns, the outermost 3 turns, the outermost 4 turns, or the outermost more turns is not provided with a first sub-electrode tab 1210. As shown in Figure 11, there is a certain distance between the edge of the first electrode tab 121 closest to the outer peripheral surface of the main body 120 and the outer peripheral surface of the main body 120.

[0247] In some embodiments, the wound electrode assembly 12 includes multiple turns of a second electrode sheet, 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 sheet. For example, the second electrode sheet of the outermost m2 turns is not provided with a second sub-electrode tab 1220, such as the second electrode sheet of the outermost first and second turns is not provided with a second sub-electrode tab 1220, so that there is a certain distance between the second electrode tab 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 second electrode sheet of the outermost 1 turn, the outermost 2 turns, the outermost 3 turns, the outermost 4 turns, or the outermost more turns is not provided with a second sub-electrode tab 1220. As shown in Figure 11, there is a certain distance between the edge of the second electrode tab 122 closest to the outer peripheral surface of the main body 120 and the outer peripheral surface of the main body 120.

[0248] In the above technical solution, by not providing the first sub-tab 1210 on the first pole piece of the outermost m1 circle, the first pole tab 121 can be effectively spaced apart from the second wall 111, thereby reducing the risk of short circuit between the first pole 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 pole piece of the outermost m2 circle, the second pole tab 122 can be effectively spaced apart from the first wall 110, thereby reducing the risk of damage to the second pole tab 122 due to interference between the second pole tab 122 and the second wall 111 when the electrode assembly 12 is placed in the housing 11, which is beneficial to improving the reliability of the battery 100.

[0249] According to some embodiments of the present application, the present application further provides a battery 100 , which includes the battery cell 10 of any of the above solutions.

[0250] As shown in FIG. 2 , the battery 100 may further include a box body 20 , in which the battery cells 10 are accommodated.

[0251] In some embodiments, the box body 20 may include a first box body 21 and a second box body 22 . The first box body 21 and the second box body 22 cover each other, and the first box body 21 and the second box body 22 jointly define an assembly space for accommodating the battery cells 10 .

[0252] 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, and 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 jointly define an 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.

[0253] Of course, the box body 20 formed by the first box body 21 and the second box body 22 can be in various shapes, such as a cylinder or a rectangular parallelepiped, etc. For example, in FIG2 , the box body 20 is a rectangular parallelepiped structure.

[0254] Optionally, the number of battery cells 10 disposed in the housing 20 may be one or more. For example, in FIG2 , the housing 20 of the battery 100 includes multiple battery cells 10, which may be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a configuration in which multiple battery cells 10 are connected in both series and parallel. Multiple battery cells 10 may be directly connected in series, in parallel, or in a hybrid configuration, and then the entire structure formed by the multiple battery cells 10 is housed in the housing 20. Of course, the battery 100 may also be a battery module structure formed by first connecting multiple battery cells 10 in series, in parallel, or in a hybrid configuration, and then the multiple battery modules are further connected in series, in parallel, or in a hybrid configuration to form a whole structure housed in the housing 20.

[0255] The battery 100 may further include other structures. For example, the battery 100 may further include a busbar component, which connects the plurality of battery cells 10 to achieve electrical connection between the plurality of battery cells 10 .

[0256] It should be noted that in some embodiments, the battery 100 may not be provided with a housing 20. The battery 100 includes multiple battery cells 10, and the battery 100 composed of multiple battery cells 10 can be directly assembled on an electrical device to provide electrical energy to the electrical device through the multiple battery cells 10. In other words, the housing 20 can serve as part of the electrical device. Taking a vehicle as an example, the housing 20 can serve as part of the vehicle's chassis structure. For example, a portion of the housing 20 can form at least a portion of the vehicle's floor, or a portion of the housing 20 can form at least a portion of the vehicle's crossbeam or longitudinal beam.

[0257] According to some embodiments of the present application, the present application further provides an electrical device, which includes the battery cell 10 of any of the above solutions, and the battery cell 10 is used to provide electrical energy to the electrical device.

[0258] According to some embodiments of the present application, referring to Figures 4-11 , some embodiments of the present application provide a battery cell 10. The battery cell 10 includes a housing 11, electrode terminals 112, an electrode assembly 12, a first insulating member 13, a first adapter 14, a second adapter 15, and a second insulating member 16.

[0259] 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 first end wall can be an end cap of the housing 11, and the second wall 111 can be a shell of the housing 11, or a peripheral wall of the housing 11. The electrode terminal 112 is insulated and mounted on the first wall 110. The electrode assembly 12 is housed within the housing 11 and 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 surface 1200 adjacent to the first wall 110. The first electrode tab 121 and the second electrode tab 122 are both disposed on the first end surface 1200. The first electrode tab 121 is electrically connected to the electrode terminal 112 via the first adapter 14, and the second electrode tab 122 is electrically connected to the first wall 110 via the second adapter 15.

[0260] Surfaces of the first electrode tab 121 and the second electrode tab 122 facing the first wall 110 are both fan-shaped, so as to fully utilize the inner space of the cylindrical housing 11 .

[0261] 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 from the second adapter 15, from the second wall 111, and from the first wall 110. A first surface 160 of the second insulating member 16 is in contact with the first electrode tab 121.

[0262] The first insulating member 13 is provided on the outer circumferential 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 and isolate the first tab 121 from the second wall 111. The first insulating member 13 is sheet-shaped. A portion of the first insulating member 13 is connected to the outer circumference of the main body 120. A portion of the first insulating member 13 is connected to the outer circumference of the second insulating member 16 to ensure that the portion of the first insulating member 13 can be stably located between the first tab 121 and the second wall 111, thereby achieving insulation and isolation between the first tab 121 and the second wall 111.

[0263] The first insulating member 13 surrounds the first tab 121 but not the second tab 122. Along the circumferential direction y of the main body, the central angle α1 of the first insulating member 13 is greater than the central angle α2 of the first tab 121.

[0264] Along the direction from the main body 120 toward the first wall 110, the insulating member protrudes from the first surface 160. The dimension h1 of the first insulating member protruding from the first surface 160 may be greater than or equal to 0.5 mm. In some embodiments, the dimension h1 of the first insulating member protruding from the first surface 160 may be greater than or equal to 1.5 mm. Along the direction from the first wall 110 toward the main body 120, the first insulating member 13 protrudes from the first end surface 1200. The dimension h2 of the first insulating member 13 protruding from the first end surface 1200 may be greater than or equal to 0.5 mm. In some embodiments, the dimension h2 of the insulating member protruding from the first end surface 1200 may be greater than or equal to 1.5 mm.

[0265] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Those skilled in the art will readily appreciate that this application is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this application shall be included within the scope of protection of this application.

Claims

1. A battery cell, wherein: include: A housing having a first wall and a second wall, wherein the second wall is arranged around an edge of the first wall; an electrode terminal, insulated and mounted on the first wall; an electrode assembly, contained in the shell, the electrode assembly comprising a main body, a first pole ear and a second pole ear, the first pole ear and the second pole ear having opposite polarities, the main body having a first end surface close to the first wall along the thickness direction of the first wall, the first pole ear and the second pole ear both being arranged on the first end surface, the first pole ear being electrically connected to the electrode terminal, and the second pole ear being electrically connected to the shell; 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 electrode tab and the second wall so that the first electrode tab and the second wall are insulated and isolated from each other.

2. The battery cell according to claim 1, wherein: Along the circumference of the main body, the central angle corresponding to the first insulating member is α1, and α1<360°.

3. The battery cell according to claim 1 or 2, wherein: Along the circumference of the main body, the center angle corresponding to the first insulating member is α1, and the center angle corresponding to the first pole tab is α2, satisfying α1>α2.

4. The battery cell according to any one of claims 1 to 3, wherein: Along the circumference of the main body, the center angle corresponding to the first insulating member is α1, and the center angle corresponding to the second pole ear is α3, satisfying α1+α3<360°.

5. The battery cell according to any one of claims 1 to 4, wherein: Along the circumference of the main body, the first insulating member does not surround the second pole tab.

6. The battery cell according to any one of claims 1 to 5, wherein: The battery cell further comprises: A first adapter, the first adapter connecting the first electrode tab and the electrode terminal; A second insulating member is disposed between the first adapter and the housing to insulate and isolate the first adapter and the housing.

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

8. The battery cell according to claim 6 or 7, wherein: Along the thickness direction of the first wall, the second insulating member has a first surface facing the electrode assembly, the first surface is connected to the first electrode tab, and along the direction of the main body pointing to the first wall, the first insulating member exceeds the first surface.

9. The battery cell according to claim 8, wherein: Along the direction from the main body to the first wall, the first insulating member protrudes from the first surface by a dimension h1, satisfying h1≥0.5 mm.

10. The battery cell according to claim 9, wherein: Satisfy h1≥1.5mm.

11. The battery cell according to any one of claims 1 to 10, wherein: Along the direction of the first wall pointing toward the main body, the first insulating member protrudes beyond the first end surface.

12. The battery cell according to claim 11, wherein: Along the direction from the first wall to the main body, the first insulating member protrudes beyond the first end surface by a dimension h2, satisfying h2≥0.5 mm.

13. The battery cell according to claim 12, wherein: Satisfy h2≥1.5mm.

14. The battery cell according to any one of claims 1 to 13, wherein: The thickness of the first insulating member is T, and satisfies T≥30 μm.

15. The battery cell according to any one of claims 1 to 14, wherein: The electrode assembly is a wound electrode assembly, the first electrode tab includes a plurality of first sub-electrode tabs, and each of the first sub-electrode tabs has the same size in the winding direction of the electrode assembly; or Along the direction from the inner circle to the outer circle of the electrode assembly, the sizes of the plurality of first sub-electrode tabs gradually increase in the winding direction of the electrode assembly.

16. The battery cell according to any one of claims 1 to 15, wherein: The electrode assembly is a wound electrode assembly, the second electrode tab includes a plurality of second sub-electrode tabs, and each of the second sub-electrode tabs has the same size in the winding direction of the electrode assembly; or Along the direction from the inner circle to the outer circle of the electrode assembly, the sizes of the plurality of second sub-electrode tabs gradually increase in the winding direction of the electrode assembly.

17. The battery cell according to any one of claims 1 to 16, wherein: The first electrode tab has a second surface facing the first wall, and the second surface is fan-shaped.

18. The battery cell according to claim 17, wherein: Along the circumference of the main body, the second surface has a first edge and a second edge that are away from each other, and an 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 to 18, wherein: The second electrode tab has a third surface facing the first wall, and the third surface is fan-shaped.

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

21. The battery cell according to any one of claims 1 to 20, wherein: The electrode assembly comprises a first pole piece and a second pole piece, and the electrode assembly is a wound electrode assembly; The first pole piece includes a plurality of first sub-pole ears, the plurality of first sub-pole ears form the first pole ear, the first pole piece of the innermost n1 circles is not provided with the first sub-pole ear, n1≥1; and / or The second pole piece includes a plurality of second sub-pole ears, and the plurality of second sub-pole ears form the second pole ear. The second pole piece of the innermost n2 circles is not provided with the second sub-pole ear, and n2≥1.

22. The battery cell according to any one of claims 1 to 21, wherein: The electrode assembly comprises a first pole piece and a second pole piece, and the electrode assembly is a wound electrode assembly; The first pole piece includes a plurality of first sub-pole ears, the plurality of first sub-pole ears form the first pole ear, the first pole piece of the outermost m1 circle is not provided with the first sub-pole ear, m1≥1; and / or The second pole piece includes a plurality of second sub-pole ears, and the plurality of second sub-pole ears form the second pole ear. The second pole piece of the outermost m2 circle is not provided with the second sub-pole ear, and m2≥1.

23. A battery, wherein: Comprising a battery cell as claimed in any one of claims 1 to 22.

24. An electrical device, wherein: The invention comprises a battery cell as claimed in any one of claims 1 to 22, wherein the battery cell is used to provide electrical energy.

Images