Battery cell, battery, and electric device

Abstract

A battery cell, a battery, and an electric device. The battery cell comprises a casing, an electrode terminal, an electrode assembly, a first adapter, and a second adapter. The casing has a first wall. The electrode terminal is insulated and mounted to the first wall. The electrode assembly comprises a main body part, a first tab, and a second tab; the polarities of the first tab and the second tab are opposite; and in the thickness direction of the first wall, the first tab and the second tab are both arranged at the end of the main body part facing the first wall. The first adapter comprises a first connecting part and a second connecting part; the first connecting part is connected to the first wall; and the second connecting part is connected to the first tab. The second adapter is connected to the electrode terminal and the second tab. In the thickness direction of the first wall, the orthographic projection of the first adapter does not overlap the orthographic projection of the second adapter, and in the thickness direction of the first wall, the orthographic projection of the first connecting part does not overlap the orthographic projection of the second tab. The technical solution can improve the reliability of batteries.

Description

Battery cells, batteries and electrical devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202311186339.0, filed on September 14, 2023, 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, a first adapter, and a second adapter. The shell has a 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 tab, and a second pole tab. The polarities of the first pole tab and the second pole tab are opposite, and along the thickness direction of the first wall, the first pole tab and the second pole tab are both arranged at one end of the main body facing the first wall. The first adapter comprises a first connecting portion and a second connecting portion, the first connecting portion being connected to the first wall, and the second connecting portion being connected to the first pole tab. The second adapter connects the electrode terminal and the second pole tab. In particular, along the thickness direction of the first wall, the orthographic projection of the first adapter does not overlap with the orthographic projection of the second adapter, and along the thickness direction of the first wall, the orthographic projection of the first connecting portion does not overlap with the orthographic projection of the second pole tab.

[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, the space occupied by the electrode assembly in the direction from the electrode assembly to the first wall is reduced, thereby improving the energy density of the battery cell having such an electrode assembly. Furthermore, by arranging the orthographic projection of the first adapter along the thickness direction of the first wall so that it does not overlap with the orthographic projection of the second adapter, the risk of overlapping the first adapter and the second adapter causing an internal short circuit in the battery cell is reduced, thereby improving the battery reliability. By arranging the first connecting portion to connect to the first wall and the second connecting portion to connect to the first tab, the electrical connection between the first wall and the first tab is facilitated, reducing the risk of internal short circuits in the battery cell due to failure of the connection between the first adapter and the first tab or failure of the connection between the first adapter and the first wall. Furthermore, by arranging the orthographic projection of the first connecting portion along the thickness direction of the first wall so that it does not overlap with the orthographic projection of the second tab, the first connecting portion does not occupy the space between the second tab and the first wall, thereby effectively reducing the risk of overlapping the first adapter and the second adapter causing an internal short circuit in the battery cell, thereby improving the battery reliability.

[0011] According to some embodiments of the present application, the first connecting portion has a first surface in contact with the first wall, the second connecting portion has a second surface in contact with the first tab, and along the thickness direction of the first wall, there is a height difference h1 between the first surface and the second surface, satisfying h1 ≤ 3 mm.

[0012] In the above technical solution, by setting the height difference h1 between the first surface and the second surface to be less than or equal to 3 mm, on the one hand, the first surface of the first connecting part can be connected to the first wall to achieve stable transmission of current between the first pole ear and the first wall; on the other hand, it can reduce the risk of the first adapter being too thick and interfering with the first wall, resulting in the first wall, the first adapter or the first pole ear being compressed and damaged, thereby improving the reliability of the battery.

[0013] According to some embodiments of the present application, the cross-sectional area of ​​the main body is S, the area of ​​the first surface is S1, and the area of ​​the second surface is S2, satisfying S1+S2≤S / 2.

[0014] In the above technical solution, by setting the sum of the area S1 of the first surface and the area S2 of the second surface to be no greater than half of the cross-sectional area S of the main body, on the one hand, a larger contact area can be provided between the first adapter and the first pole ear, as well as between the first adapter and the first wall, so that the current can be stably transmitted between the first pole ear and the first wall; on the other hand, the risk of the contact surface between the second adapter and the second pole ear or the contact area between the second adapter and the electrode terminal being too small due to the first adapter occupying too large an area, thereby affecting the positive and negative current output and input performance of the battery cell, so that the battery has stronger performance.

[0015] According to some embodiments of the present application, the first adapter further includes a transition portion, which extends from an edge of the second connecting portion toward the first wall, and connects the first connecting portion and the second connecting portion.

[0016] In the above technical solution, by setting the transition part, on the one hand, the first connecting part and the second connecting part can be effectively connected, so that the first adapter can effectively and stably connect the first wall and the first pole lug, reducing the risk of short circuit between the first wall and the first pole lug, so that the battery has higher reliability; on the other hand, by setting the transition part to extend from the edge of the second connecting part, the space between the electrode assembly and the first wall can be reasonably utilized, and the contact area between the first adapter and the first wall and between the first adapter and the first pole lug can be increased, which can effectively improve the flow capacity between the first pole lug and the first wall, and is beneficial to the improvement of battery performance.

[0017] According to some embodiments of the present application, along the thickness direction of the first wall, the orthographic projection of the first connecting portion is arc-shaped.

[0018] In the above technical solution, along the thickness direction of the first wall, by setting the orthographic projection of the first connecting part to an arc shape, on the one hand, when the battery cell is a cylindrical battery cell, it can reasonably benefit the space between the electrode assembly and the first wall, so that there is a larger electrical connection area between the first pole ear and the first wall; on the other hand, compared with the solution in which the first connecting part is annular and arranged in a circle around the outer circumference of the first wall, it can effectively reduce the risk of the first adapter and the second adapter overlapping each other to cause internal short circuit of the battery cell, so that the battery has higher reliability.

[0019] According to some embodiments of the present application, along the thickness direction of the first wall, the orthographic projection of the first connecting portion is annular, and the orthographic projection of the first connecting portion surrounds the orthographic projection of the second connecting portion, and the orthographic projection of the second adapter is located outside the orthographic projection of the first connecting portion.

[0020] In the above technical solution, by arranging the orthographic projection of the first connecting portion in a ring shape along the thickness direction of the first wall, surrounding the orthographic projection of the second connecting portion, the contact connection between the first connecting portion and the first wall can be improved, thereby facilitating the improvement of the current flow capacity between the first tab and the first wall. Furthermore, by arranging the orthographic projection of the second adapter outside the orthographic projection of the first connecting portion, the risk of overlapping the first adapter and the second adapter, causing an internal short circuit in the battery cell, can be effectively reduced, thereby enhancing the reliability of the battery.

[0021] According to some embodiments of the present application, along the circumference of the electrode assembly, the central angle corresponding to the first connecting portion is α, satisfying 0<α≤180°.

[0022] In the above technical solution, by setting the central angle α corresponding to the first connecting part to be less than or equal to 180°, on the one hand, the first connecting part does not occupy too much space between the electrode assembly and the first wall, so that there is a larger connection area between the second adapter and the electrode terminal and the second tab, so that the battery has stronger performance; on the other hand, the first connecting part can be kept away from the second adapter, reducing the risk of the first connecting part and the second adapter overlapping each other and causing internal short circuit of the battery cell, so that the battery has higher reliability.

[0023] According to some embodiments of the present application, 0<α≤120° is satisfied.

[0024] In the above technical solution, by setting the central angle α corresponding to the first connecting part to be less than or equal to 120°, on the one hand, a larger connection area can be provided between the second adapter and the electrode terminal and the second tab, so that the battery has stronger performance; on the other hand, the first connecting part can be as far away from the second adapter as possible, reducing the risk of the first connecting part and the second adapter overlapping each other and causing an internal short circuit in the battery cell, so that the battery has higher reliability.

[0025] According to some embodiments of the present application, the second adapter includes a third connecting portion and a fourth connecting portion, the third connecting portion being connected to the electrode terminal, and the fourth connecting portion being connected to the second tab. Along the thickness direction of the first wall, an orthographic projection of the third connecting portion and an orthographic projection of the fourth connecting portion do not overlap.

[0026] In the above technical solution, the third and fourth connecting portions are used to connect the electrode terminal and the second tab, respectively. This effectively improves the connection stability between the second tab and the electrode terminal, reduces the risk of short circuits between the second tab and the electrode terminal, and improves battery reliability. Furthermore, by arranging the orthographic projection of the third connecting portion and the orthographic projection of the fourth connecting portion along the thickness direction of the first wall so that they do not overlap, the second adapter can be connected to the electrode terminal and the second tab at different locations, reducing the difficulty of assembling the second adapter and improving the manufacturing efficiency of the battery cell, thereby improving the manufacturing efficiency of the battery.

[0027] According to some embodiments of the present application, the third connecting portion has a third surface that contacts the electrode terminal, the fourth connecting portion has a fourth surface that contacts the second tab, and along the thickness direction of the first wall, there is a height difference h2 between the third surface and the fourth surface, satisfying h2 ≤ 3 mm.

[0028] In the above technical solution, by setting the height difference h2 between the third surface and the fourth surface to be less than or equal to 3 mm, on the one hand, the third surface of the third connecting portion can be connected to the electrode terminal to achieve stable transmission of current between the second tab and the electrode terminal; on the other hand, it can reduce the risk of the second adapter being too thick and interfering with the electrode terminal, resulting in the electrode terminal, the second adapter or the second tab being compressed and damaged, thereby improving the reliability of the battery.

[0029] According to some embodiments of the present application, the cross-sectional area of ​​the main body is S, the area of ​​the third surface is S3, and the area of ​​the fourth surface is S4, satisfying S3+S4≤S / 2.

[0030] In the above technical solution, by setting the sum of the area S3 of the third surface and the area S4 of the fourth surface to be no greater than half of the cross-sectional area S of the main body, on the one hand, a larger contact area can be provided between the second adapter and the second pole lug, as well as between the second adapter and the electrode terminal, so that the current can be stably transmitted between the second pole lug and the electrode terminal; on the other hand, the risk of the contact surface between the first adapter and the first pole lug or the contact area between the first adapter and the first wall being too small due to the second adapter occupying too large an area, thereby affecting the positive and negative current output and input performance of the battery cell, so that the battery has stronger performance.

[0031] According to some embodiments of the present application, the electrode assembly is a wound electrode assembly, the main body has a central through hole, the central through hole passes through the main body along the axial direction of the main body, and the third connecting portion covers at least a portion of the central through hole.

[0032] In the above technical solution, by setting the third connecting part to cover at least part of the central through hole, on the one hand, the second adapter can reasonably utilize the space between the electrode assembly and the first wall corresponding to the central through hole, so that the second adapter has a larger surface area, which is beneficial to the transmission of current between the second pole ear and the electrode terminal, and is beneficial to the improvement of battery performance; on the other hand, at least part of the third connecting part can be made away from the second pole ear, that is, the connection part between the second adapter and the electrode terminal and the connection part between the second adapter and the second pole ear are far away from each other, thereby reducing the difficulty of assembling the second adapter and improving the manufacturing efficiency of the battery.

[0033] According to some embodiments of the present application, the battery cell further includes an insulating member, which is located between the electrode assembly and the first wall, and the insulating member insulates and isolates the first adapter from the second adapter.

[0034] In the above technical solution, by providing an insulating member to insulate and isolate the first adapter and the second adapter, the risk of the first adapter and the second adapter overlapping each other and causing an internal short circuit in the battery cell can be reduced, so that the battery has higher reliability.

[0035] According to some embodiments of the present application, the insulating part includes an insulating body and a separator, the insulating body is an annular structure arranged along the circumference of the electrode assembly, the insulating body insulates and isolates the second adapter and the outer shell, the separator is connected to the inner annular surface of the insulating body, and the separator insulates and isolates the first adapter and the second adapter.

[0036] In the above technical solution, by providing an insulating member, the risk of the first adapter and the second adapter overlapping and causing an internal short circuit in the battery cell can be effectively reduced, so that the battery has higher reliability; wherein, the insulating member includes a ring-shaped insulating body, which can effectively insulate and isolate the second adapter and the outer shell, thereby effectively reducing the risk of the second adapter overlapping and causing an internal short circuit in the battery cell, so that the battery has higher reliability.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] In the above technical solution, by not providing the first sub-tab on the first electrode piece of the outermost m1 circle, the first tab can be effectively spaced apart from the side wall of the housing, thereby reducing the risk of short circuit between the first tab and the housing, 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 tab can be effectively spaced apart from the first wall tab, thereby reducing the risk of damage to the second tab due to interference between the second tab and the housing when the electrode assembly is placed in the housing, which is beneficial to improving battery reliability.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

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

[0046] In the above technical solution, by setting the fifth surface of the first pole ear to a fan-shaped structure, the first pole ear can fully utilize the internal space of the shell, so that the first pole ear has a larger area to improve the flow capacity between the first pole ear and the first wall, 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 fifth 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≤180°.

[0048] In the above technical solution, by setting the angle β1 formed between the first edge and the second edge of the first pole lug to be less than or equal to 180 degrees, the central angle of the fifth surface of the fan-shaped first pole lug is less than or equal to 180 degrees, so as to alleviate the phenomenon that the first pole lug and the second pole lug are easily overlapped due to the large space occupied by the first pole lug, resulting in an internal short circuit of the battery cell, thereby making the battery have higher reliability.

[0049] According to some embodiments of the present application, the second electrode tab has a sixth surface facing the first wall, and the sixth surface is fan-shaped.

[0050] In the above technical solution, by setting the sixth 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 electrode terminal, so that the battery has better charge and discharge performance.

[0051] According to some embodiments of the present application, along the circumference of the main body, the sixth 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≤270°.

[0052] In the above technical solution, by setting the angle β2 formed between the third edge and the fourth edge of the second pole lug to be less than or equal to 270 degrees, the central angle of the second surface of the fan-shaped second pole lug is less than or equal to 270 degrees, so as to alleviate the phenomenon that the second pole lug and the first pole lug are easily overlapped due to the large space occupied by the second pole lug, resulting in an internal short circuit of the battery cell, thereby making the battery have higher 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 an exploded perspective 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 a first adapter and a second adapter in some embodiments of the present application;

[0062] FIG6 is a schematic diagram of an orthographic projection of a first adapter and an orthographic projection of a second adapter in some embodiments of the present application;

[0063] FIG7 is a schematic internal diagram of a partial structure of a first adapter in some embodiments of the present application;

[0064] FIG8 is a schematic diagram of a first adapter and a second adapter in some embodiments of the present application;

[0065] FIG9 is a schematic diagram of a first adapter and a second adapter in some embodiments of the present application;

[0066] FIG10 is a schematic diagram of a first adapter and a second adapter in some embodiments of the present application;

[0067] FIG11 is a schematic diagram of an orthographic projection of a first adapter and an orthographic projection of a second adapter in some embodiments of the present application;

[0068] FIG12 is a schematic diagram of a first adapter in some other embodiments of the present application;

[0069] FIG13 is a schematic diagram of an insulating member, a first adapter, and a second adapter in some embodiments of the present application;

[0070] FIG14 is a top view of an electrode assembly in some embodiments of the present application;

[0071] FIG15 is a top view of an electrode assembly in some embodiments of the present application.

[0072] Icons: 100-battery; 10-battery cell; 11-housing; 110-first wall; 111-housing; 112-bottom plate; 12-electrode terminal; 13-electrode assembly; 130-main body; 1300-center through hole; 131-first tab; 1310-fifth surface; 1311-first sub-tab; 13100-first edge; 13101-second edge; 132-second tab; 1320-sixth surface; 1321-second sub-tab; 13200-third edge; 13201-fourth edge; 14-first turn Connector; 140-first connecting part; 1400-first surface; 141-second connecting part; 1410-second surface; 142-transition part; 15-second adapter; 150-third connecting part; 1500-third surface; 151-fourth connecting part; 1510-fourth surface; 16-insulating part; 160-insulating body; 161-partitioning part; x-thickness direction of the first wall; y-circumferential direction of the main body; 1000-vehicle; 200-controller; 300-motor; 20-box; 21-first box body; 22-second box body. DETAILED DESCRIPTION

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] The term "plurality" used in this application refers to two or more (including two).

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] 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.).

[0086] 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 NCM622 ), 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 0.05 O2) and at least one of its modified compounds, etc.

[0087] 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.

[0088] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0089] 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.).

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0095] 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.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] 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.

[0101] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0102] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0103] 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.

[0104] 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.

[0105] As an example, a composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0106] 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.

[0107] 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.

[0108] 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), nickel steel, stainless steel, a composite metal housing (e.g., a copper-aluminum composite housing), or an aluminum-plastic film.

[0109] As an example, the battery cells may be cylindrical battery cells or prismatic battery cells.

[0110] 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.

[0111] 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.

[0112] 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.

[0113] 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.

[0114] In some embodiments, the battery may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0115] 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.

[0116] A battery cell generally includes a housing and an electrode assembly housed in the housing. The electrode assembly includes a main body and a tab disposed on the main body. The tab is used to output or input electrical energy from the electrode assembly. In order to save the space occupied by the electrode assembly in the housing and to improve the energy density of the battery cell, especially in a battery cell with a cylindrical structure, in the related art, the positive and negative tabs of the electrode assembly are generally disposed at the same end of the main body to achieve a structure in which the electrode assembly has tabs on the same side, thereby saving the space occupied by the electrode assembly in the housing. The positive and negative tabs include a first tab and a second tab. The first tab is electrically connected to the first wall of the housing via a first adapter. The second tab is electrically connected to the electrode terminal disposed on the first wall via a second adapter.

[0117] Improving battery reliability is a pressing technical challenge in the development of battery technology. Currently, in battery cells where both the first and second tabs are located at the same end of the main body, the first and second adapters overlap along the thickness of the first wall. When the battery cell is impacted, the first and second adapters can deform or detach, creating a risk of overlap along the thickness of the first wall. This can cause internal short circuits within the battery cell and compromise battery reliability.

[0118] In view of this, in order to improve the problem that the overlap between the first adapter and the second adapter causes a short circuit in the battery cell, thereby affecting the reliability of the battery, some embodiments of the present application provide a battery cell with an electrode assembly having a pole ear on the same side, and along the thickness direction of the first wall of the battery cell, the orthographic projection of the first adapter is set to not overlap with the orthographic projection of the second adapter.

[0119] In the above technical solution, along the thickness direction of the first wall, by setting the orthographic projection of the first adapter to not overlap with the orthographic projection of the second adapter, the risk of the first adapter and the second adapter overlapping each other and causing internal short circuit of the battery cell can be reduced, so that the battery has higher reliability.

[0120] 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.

[0121] 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.

[0122] 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.

[0123] 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 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, 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 can 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.

[0124] 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, but also serve as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0125] Please refer to FIG. 2 , which 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 .

[0126] 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.

[0127] 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.

[0128] 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.

[0129] 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 .

[0130] 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.

[0131] According to some embodiments of the present application, a battery cell 10 is provided. Referring to Figures 3-6 , Figure 3 is a perspective view of the battery cell 10 in some embodiments of the present application, Figure 4 is an exploded perspective view of the battery cell 10 in some embodiments of the present application, Figure 5 is a schematic diagram of a first adapter 14 and a second adapter 15 in some embodiments of the present application, and Figure 6 is a schematic diagram of an orthographic projection of the first adapter 14 and an orthographic projection of the second adapter 15 in some embodiments of the present application.

[0132] The battery cell 10 includes a shell 11, an electrode terminal 12, an electrode assembly 13, a first adapter 14, and a second adapter 15. The shell 11 has a first wall 110. The electrode terminal 12 is insulated and mounted on the first wall 110. The electrode assembly 13 is accommodated in the shell 11, and the electrode assembly 13 includes a main body 130, a first pole tab 131, and a second pole tab 132. The polarities of the first pole tab 131 and the second pole tab 132 are opposite. Along the thickness direction x of the first wall, the first pole tab 131 and the second pole tab 132 are both arranged at one end of the main body 130 facing the first wall 110. The first adapter 14 connects the first wall 110 and the first pole tab 131. The second adapter 15 connects the electrode terminal 12 and the second pole tab 132. In the thickness direction x of the first wall, the orthographic projection of the first adapter 14 does not overlap with the orthographic projection of the second adapter 15.

[0133] The housing 11 is a component for accommodating the electrode assembly 13. 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 111 and an end cap. A accommodating cavity is formed inside the shell 111, and the accommodating cavity is used to accommodate the electrode assembly 13. The shell 111 has an opening connected to the accommodating cavity. The end cap is covered at the opening of the shell 111 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 13 and the electrolyte. Optionally, the housing 11 may also include a bottom plate 112, and openings are respectively formed at both ends of the shell 111, one of the openings is closed by the end cap, and the other opening is closed by the bottom plate 112.

[0134] 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 111 or other parts of the shell 11 can be made of non-metallic materials.

[0135] In some embodiments, when assembling the battery cell 10, the electrode assembly 13 may be placed in the housing 111 first, and the housing 111 may be filled with electrolyte, and then the end cap may be attached to the opening of the housing 111 to complete the assembly of the battery cell 10. Alternatively, in some embodiments, when assembling the battery cell 10, the electrode assembly 13 may be placed in the housing 111 first, and then the end cap may be attached to the opening of the housing 111, and then the housing 111 may be filled with electrolyte through the injection hole on the end cap or other part of the housing 11, and then the injection hole may be closed to complete the assembly of the battery cell 10.

[0136] 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 13. For example, if the electrode assembly 13 is a cylindrical structure, a cylindrical housing 11 may be selected.

[0137] The first wall 110 is part of the outer shell 11. The first wall 110 may be insulated and mounted with an electrode terminal 12. The electrode terminal 12 is used to electrically connect to the second electrode tab 132 of the electrode assembly 13. The first wall 110 may be electrically connected to the first electrode tab 131. The first wall 110 may be made of a conductive material, such as a metal material. For example, the first wall 110 may be made of aluminum, copper, iron, aluminum, steel, or an aluminum alloy. In some embodiments, the first wall 110 may be an end cap of the outer shell 11, and the shell 111 of the outer shell 11 is disposed around the edge of the first wall 110.

[0138] In some embodiments, the first wall 110 can be connected to the housing 111 by welding, bonding, clamping or other connection methods. In some embodiments, the first wall 110 and the housing 111 can be integrally formed.

[0139] The electrode terminal 12 is an insulated component mounted on the first wall 110. The electrode terminal 12 is used to connect to the second electrode tab 132 via the second adapter 15, allowing current to flow into or out of the second electrode tab 132 through the electrode terminal 12. In some embodiments, the electrode terminal 12 can have a cylindrical structure or a polygonal prism structure. In some embodiments, the electrode terminal 12 is made of a metal material, such as aluminum, copper, iron, aluminum, steel, an alloy, or a composite metal.

[0140] In some embodiments, the electrode terminal 12 may be mounted on the first wall 110 via an insulating structure.

[0141] It should be noted that the electrode assembly 13 is the component within the battery cell 10 where the electrochemical reaction occurs. The electrode assembly 13 can have various structures. For example, the electrode assembly 13 can be a wound structure formed by winding a positive electrode sheet, a separator, and a negative electrode sheet, with the main body 130 of the electrode assembly 13 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.

[0142] The main body 130 is the area of ​​the electrode assembly 13 within the battery cell 10 where chemical reactions occur. The main body 130 is a wound structure consisting of the area of ​​the positive electrode sheet coated with the positive electrode active material layer, the separator, and the area of ​​the negative electrode sheet coated with the negative electrode active material layer. It primarily operates by allowing metal ions to migrate between the positive and negative electrode sheets of opposite polarity. In some embodiments, the thickness direction x of the first wall can be parallel to the height direction of the electrode assembly 13.

[0143] The first electrode tab 131 and the second electrode tab 132 are both disposed at one end of the main body 130 facing the first wall 110. In other words, the first electrode tab 131 and the second electrode tab 132 are disposed at the same end of the main body 130 in the thickness direction x of the first wall, and are located at the end of the main body 130 facing the first wall 110. The first electrode tab 131 and the second electrode tab 132 are respectively used to output or input the positive and negative electrodes of the electrode assembly 13. If the first electrode tab 131 is used to input or output the positive electrode of the electrode assembly 13, the first electrode tab 131 is a component formed by stacking and connecting the regions of the positive electrode sheet that are not coated with the positive electrode active material layer. Correspondingly, the second electrode tab 132 is used to input or output the negative electrode of the electrode assembly 13, and the second electrode tab 132 is a component formed by stacking and connecting the regions of the negative electrode sheet that are not coated with the negative electrode active material layer. If the first electrode tab 131 is used to input or output the negative electrode of the electrode assembly 13, the first electrode tab 131 is a component formed by stacking and connecting the regions of the negative electrode sheet that are not coated with the negative electrode active material layer. Correspondingly, the second electrode tab 132 is used to input or output the positive electrode of the electrode assembly 13, and the second electrode tab 132 is a component formed by stacking and connecting the regions of the positive electrode sheet that are not coated with the positive electrode active material layer. For example, in the embodiment of the present application, the first electrode tab 131 is used to input or output the negative electrode of the electrode assembly 13, and the second electrode tab 132 is used to input or output the positive electrode of the electrode assembly 13.

[0144] The first adapter 14 is a component disposed between the first tab 131 and the first wall 110, and the electrical connection between the first tab 131 and the first wall 110 can be achieved through the first adapter 14. The first adapter 14 is made of a conductive material, for example, the material of the first adapter 14 can be copper, iron, aluminum, steel, stainless steel, nickel steel or aluminum alloy. The connection relationship between the first adapter 14 and the first tab 131 includes but is not limited to welding, bonding, clamping or other connection relationships such as connection through other connecting components. The connection relationship between the first adapter 14 and the first wall 110 includes but is not limited to welding, bonding, clamping or other connection relationships such as connection through other connecting components.

[0145] The second adapter 15 is a component disposed between the second tab 132 and the electrode terminal 12. The first adapter 14 enables electrical connection between the second tab 132 and the electrode terminal 12. The second adapter 15 is made of a conductive material. For example, the material of the second adapter 15 can be copper, iron, aluminum, steel, stainless steel, nickel steel, or an aluminum alloy. The connection between the second adapter 15 and the second tab 132 includes, but is not limited to, welding, bonding, clamping, or connection via other connecting components. The connection between the second adapter 15 and the electrode terminal 12 includes, but is not limited to, welding, bonding, clamping, or connection via other connecting components.

[0146] "Along the thickness direction x of the first wall, the orthographic projection of the first adapter 14 and the orthographic projection of the second adapter 15 do not overlap" may mean that in the thickness direction x of the first wall, the orthographic projection of the first adapter 14 and the orthographic projection of the second adapter 15 do not overlap with each other. In some embodiments, referring to FIG6 , the orthographic projection of the first adapter 14 may surround the orthographic projection of the second adapter 15, but the two do not overlap with each other. Referring to FIG11 , the orthographic projection of the first adapter 14 and the second adapter 15 are spaced apart from each other, wherein it can be seen in FIG11 that the orthographic projection of the first adapter 14 has a recessed area, and the orthographic projection of the second adapter 15 has a protruding area, and the protruding area can extend into the recessed area and is spaced apart from the orthographic projection of the first adapter 14.

[0147] In the above technical solution, by arranging both the first tab 131 and the second tab 132 of the electrode assembly 13 on the same end surface of the main body 130, the space occupied by the electrode assembly 13 in the direction from the electrode assembly 13 to the first wall 110 is reduced, thereby improving the energy density of the battery cell 10 having such an electrode assembly 13. Furthermore, by arranging the orthographic projection of the first adapter 14 and the orthographic projection of the second adapter 15 along the thickness direction x of the first wall so as not to overlap, the risk of overlapping of the first adapter 14 and the second adapter 15, which could cause an internal short circuit in the battery cell 10, is reduced, thereby enhancing the reliability of the battery 100.

[0148] According to some embodiments of the present application, the first adapter 14 includes a first connecting portion 140 and a second connecting portion 141. The first connecting portion 140 is connected to the first wall 110, and the second connecting portion 141 is connected to the first tab 131. Along the thickness direction x of the first wall, the orthographic projection of the first connecting portion 140 does not overlap with the orthographic projection of the second tab 132.

[0149] The first connecting portion 140 is a component of the first adapter 14 for connecting to the first wall 110. Along the direction of the electrode assembly 13 pointing to the first wall 110, the first connecting portion 140 protrudes from the second connecting portion 141. In some embodiments, the first connecting portion 140 has a first surface 1400 facing the first wall 110, and the first connecting portion 140 can be connected to the first wall 110 through the first surface 1400. In other embodiments, the first connecting portion 140 can also be connected to the first wall 110 through other parts. In some embodiments, the first connecting portion 140 can be in the form of a sheet, a block or other shapes. In some embodiments, along the thickness direction x of the first wall, the shape of the orthographic projection of the first connecting portion 140 can be annular, arc-shaped or serpentine, etc.

[0150] The second connecting portion 141 is a component of the first adapter 14 for connecting to the first electrode tab 131. In some embodiments, the second connecting portion 141 has a second surface 1410 facing the electrode assembly 13, and the second connecting portion 141 can be connected to the first electrode tab 131 through the second surface 1410. In other embodiments, the second connecting portion 141 can also be connected to the first electrode tab 131 through other parts. In some embodiments, the second connecting portion 141 can be in the form of a sheet, a block or other shapes. In some embodiments, along the thickness direction x of the first wall, the shape of the orthographic projection of the second connecting portion 141 can be fan-shaped, ring-shaped, arc-shaped or serpentine-shaped, etc. The material of the second connecting portion 141 can be the same as that of the first electrode tab 131.

[0151] In some embodiments, the material of the first connection portion 140 can be the same as or different from the material of the second connection portion 141. The first connection portion 140 and the second connection portion 141 can be separate structures, for example, the first connection portion 140 is connected to the second connection portion 141 by welding, bonding, clamping, or other connection members. The first connection portion 140 and the second connection portion 141 can also be an integral structure, for example, the first connection portion 140 is stamped from the second connection portion 141 using a stamping process, or the first connection portion 140 and the second connection portion 141 are integrally cast.

[0152] In the electrode assembly 13, the first electrode tab 131 and the second electrode tab 132 may be spaced apart to reduce the risk of short circuiting between the positive and negative electrodes within the battery cell 10. The second adapter 15 is a component disposed between the second electrode tab 132 and the first wall 110. In some embodiments, the orthographic projection of the second adapter 15 in the thickness direction x of the first wall is spaced apart from the orthographic projection of the first electrode tab 131.

[0153] “Along the thickness direction x of the first wall, the orthographic projection of the first connecting portion 140 and the orthographic projection of the second pole ear 132 do not overlap” may mean that in the thickness direction x of the first wall, the orthographic projection of the first connecting portion 140 and the orthographic projection of the second pole ear 132 do not overlap with each other, and the two may be spaced apart from each other, or as shown in Figures 5 and 6, the first connecting portion 140 is annular, and the second adapter 15, that is, the second pole piece, is within the area enclosed by the first connecting portion 140, but there is no contact between the first connecting portion 140 and the second pole piece and / or the second adapter 15.

[0154] In the above technical solution, by providing the first connecting portion 140 to connect to the first wall 110 and the second connecting portion 141 to connect to the first tab 131, the electrical connection between the first wall 110 and the first tab 131 is facilitated, thereby reducing the risk of internal short circuits in the battery cell 10 due to failure of the connection between the first adapter 14 and the first tab 131 or failure of the connection between the first adapter 14 and the first wall 110. Furthermore, along the thickness direction x of the first wall, by arranging the orthographic projection of the first connecting portion 140 to not overlap with the orthographic projection of the second tab 132, the first connecting portion 140 does not occupy the space between the second tab 132 and the first wall 110. This effectively reduces the risk of internal short circuits in the battery cell 10 due to overlapping of the first adapter 14 and the second adapter 15, thereby enhancing the reliability of the battery 100.

[0155] According to some embodiments of the present application, please refer to FIG. 7 , which is a schematic internal diagram of a partial structure of the first adapter 14 in some embodiments of the present application.

[0156] The first connection portion 140 has a first surface 1400 in contact with the first wall 110, and the second connection portion 141 has a second surface 1410 in contact with the first tab 131. Along the thickness direction x of the first wall, there is a height difference h1 between the first surface 1400 and the second surface 1410, satisfying h1≤3mm.

[0157] Along the thickness direction x of the first wall, the first electrode tab 131 is spaced apart from the first wall 110 , and the first connecting portion 140 protrudes from the second connecting portion 141 in a direction from the electrode assembly 13 to the first wall 110 .

[0158] Along the thickness direction x of the first wall, the first surface 1400 of the first connection portion 140 may face the first wall 110, and the first surface 1400 may contact the first wall 110 to be electrically connected to the first wall 110. Along the thickness direction x of the first wall, the second surface 1410 of the second connection portion 141 may face the first electrode tab 131, and the second surface 1410 may contact the first electrode tab 131 to be electrically connected to the first electrode tab 131.

[0159] In some embodiments, the surface area of ​​the second surface 1410 may be equal to the surface area of ​​the first tab 131 corresponding to the second surface 1410 . For example, the surface area of ​​the second surface 1410 may be less than or equal to the surface area of ​​the first tab 131 .

[0160] Along the thickness direction x of the first wall, there is a height difference h1 between the first surface 1400 and the second surface 1410 . The value of h1 may be less than or equal to 3 mm. For example, h1 may be 3 mm, 2 mm, 1 mm or a smaller value.

[0161] In the above technical solution, by setting the height difference h1 between the first surface 1400 and the second surface 1410 to be less than or equal to 3 mm, on the one hand, the first surface 1400 of the first connecting portion 140 can be connected to the first wall 110 to achieve stable transmission of current between the first pole ear 131 and the first wall 110; on the other hand, it can reduce the risk of the first adapter 14 being too thick and interfering with the first wall 110, resulting in the first wall 110, the first adapter 14 or the first pole ear 131 being compressed and damaged, thereby improving the reliability of the battery 100.

[0162] In some other embodiments, the height difference h1 between the first surface 1400 and the second surface 1410 may also be less than or equal to 7 mm. For example, h1 may be 7 mm, 6 mm, 5 mm, 4 mm, or a smaller value.

[0163] In some other embodiments, the height difference h1 between the first surface 1400 and the second surface 1410 may also be greater than 3 mm. For example, h1 may be 4 mm, 5 mm, 6 mm, or a larger value.

[0164] According to some embodiments of the present application, the cross-sectional area of ​​the main body 130 is S, the area of ​​the first surface 1400 is S1, and the area of ​​the second surface 1410 is S2, satisfying S1+S2≤S / 2.

[0165] The cross-sectional area of ​​the main body 130 on a plane perpendicular to the thickness direction x of the first wall, or in other words, on a plane perpendicular to the axial direction of the main body 130, is S. In some embodiments, the cross-sectional area S of the main body 130 can be equal to the surface area of ​​the end surface of the main body 130 provided with the first electrode tab 131 and the second electrode tab 132. The end surface of the main body 130 provided with the first electrode tab 131 and the second electrode tab 132 can be a first end surface.

[0166] In some embodiments, along the thickness direction x of the first wall, the orthographic projection of the first connecting portion 140 and the orthographic projection of the second connecting portion 141 do not overlap, the area of ​​the first connecting portion 140 projected onto the first end surface may be S1, the area of ​​the second connecting portion 141 projected onto the first end surface may be S2, the area of ​​the first end surface may be S, the sum of S1 and S2 may be less than or equal to half of S, for example, the value of S1+S2 may be S / 2, S / 3, S / 4 or smaller.

[0167] “S1+S2≤S / 2” can also be understood as the first adapter 14 occupies at most half of the area of ​​the first end surface, and the second adapter 15 can be provided on the portion of the first end surface not occupied by the first adapter 14 .

[0168] In the above technical solution, by setting the sum of the area S1 of the first surface 1400 and the area S2 of the second surface 1410 to be no greater than half of the cross-sectional area S of the main body 130, on the one hand, a larger contact area can be provided between the first adapter 14 and the first pole tab 131, as well as between the first adapter 14 and the first wall 110, so that the current is stably transmitted between the first pole tab 131 and the first wall 110; on the other hand, the risk of the contact surface between the second adapter 15 and the second pole tab 132 or the contact area between the second adapter 15 and the electrode terminal 12 being too small due to the first adapter 14 occupying too large an area, thereby affecting the positive and negative current output and input performance of the battery cell 10, so that the battery 100 has stronger performance.

[0169] According to some embodiments of the present application, referring to FIG. 5 and FIG. 7 , the first adapter 14 further includes a transition portion 142 , which extends from an edge of the second connection portion 141 toward the first wall 110 , and connects the first connection portion 140 and the second connection portion 141 .

[0170] The transition portion 142 is a component that connects the first connecting portion 140 and the second connecting portion 141. In some embodiments, the transition portion 142 may be in the form of a sheet, plate, or block. In some embodiments, in the thickness direction x of the first wall, one end of the transition portion 142 may be connected to the first connecting portion 140, and the transition portion 142 may be connected to the second connecting portion 141. The portion where the transition portion 142 and the first connecting portion 140 connect may be the edge of the first connecting portion 140. The portion where the transition portion 142 and the second connecting portion 141 connect may be the edge of the second connecting portion 141.

[0171] In some embodiments, the portion where the transition portion 142 and the first connection portion 140 are connected may be a non-edge portion of the first connection portion 140 , and the portion where the transition portion 142 and the second connection portion 141 are connected may be a non-edge portion of the second connection portion 141 .

[0172] In the above technical solution, by setting the transition portion 142, on the one hand, the first connecting portion 140 and the second connecting portion 141 can be effectively connected, so that the first adapter 14 can effectively and stably connect the first wall 110 and the first pole lug 131, reducing the risk of short circuit between the first wall 110 and the first pole lug 131, so that the battery 100 has higher reliability; on the other hand, by setting the transition portion 142 to extend from the edge of the second connecting portion 141, the space between the electrode assembly 13 and the first wall 110 can be reasonably utilized, and the contact area between the first adapter 14 and the first wall 110 and between the first adapter 14 and the first pole lug 131 can be increased, which can effectively improve the flow capacity between the first pole lug 131 and the first wall 110, which is beneficial to the improvement of the performance of the battery 100.

[0173] According to some embodiments of the present application, please refer to Figures 8 and 9. Figure 8 is a schematic diagram of the first adapter 14 and the second adapter 15 in some embodiments of the present application, and Figure 9 is a schematic diagram of the first adapter 14 and the second adapter 15 in some embodiments of the present application.

[0174] Along the thickness direction x of the first wall, the orthographic projection of the first connection portion 140 is arc-shaped.

[0175] In some embodiments, the first connection portion 140 may extend along an arc-shaped trajectory, so that an orthographic projection of the first connection portion 140 in the thickness direction x of the first wall is arc-shaped.

[0176] To better understand why the orthographic projection of the first connecting portion 140 is an arc, please compare the first adapter 14 shown in Figures 5 and 6. In Figures 5 and 6, the first connecting portion includes a first connecting portion 140, a second connecting portion 141, and a transition portion 142. The second connecting portion 141 can extend along an arc-shaped trajectory and is fan-shaped. The transition portion 142 extends from the outer arc edge of the second connecting portion 141 toward the first wall 110. In the extension direction of the second connecting portion 141, the dimension of the transition portion 142 is equal to the dimension of the outer arc of the second connecting portion 141. The first connecting portion 140 is annular in shape, and the end of the transition portion 142 away from the second connecting portion 141 is connected to the inner ring edge of the first connecting portion 140. In Figures 5 and 6, the orthographic projection of the first connecting portion 140 along the thickness direction x of the first wall is annular. In FIG. 5 and FIG. 6 , a portion of the first connecting portion 140 surrounds the second adapter 15 , that is, a portion of the first connecting portion 140 is located outside the second adapter 15 .

[0177] Referring to Figure 8, Figure 8 provides a solution in which the positive projection of the first connection part 140 is arc-shaped. Comparing Figure 5 and Figure 8, the first connection part 140 in Figure 8 is changed on the basis of the first connection part 140 in Figure 5. The scope of the change may include cutting off the part of the first connection part 140 that surrounds the second adapter 15 in Figure 5, and the first connection part 140 is changed from a ring shape to an arc shape. In the extension direction of the first connection part 140, the two ends of the first connection part 140 that are away from each other are adjacent to the second adapter 15 and are spaced apart from the second adapter 15.

[0178] Referring to Figure 9, Figure 9 provides a solution in which the positive projection of the first connection part 140 is arc-shaped. Comparing Figure 9 with Figure 8, the first connection part 140 in Figure 9 is changed on the basis of the first connection part 140 in Figure 8. The scope of the change may include further cutting off the part of the first adapter 14 adjacent to the second adapter 15. In the extension direction of the first connection part 140, the two ends of the first connection part 140 that are far away from each other are as far away from the second adapter 15 as possible, and the end faces of the two ends of the first connection part 140 that are far away from each other can be flush with the end face of the second connection part 141.

[0179] In the above technical solution, along the thickness direction x of the first wall, by setting the positive projection of the first connecting part 140 to an arc shape, on the one hand, when the battery cell 10 is a cylindrical battery cell 10, it can reasonably benefit the space between the electrode assembly 13 and the first wall 110, so that there is a larger electrical connection area between the first electrode tab 131 and the first wall 110; on the other hand, compared with the solution where the first connecting part 140 is annular and arranged in a circle around the outer circumference of the first wall 110, it can effectively reduce the risk of the first adapter 14 and the second adapter 15 overlapping each other and causing an internal short circuit in the battery cell 10, so that the battery 100 has higher reliability.

[0180] According to some embodiments of the present application, please refer to Figures 10 and 11. Figure 10 is a schematic diagram of the first adapter 14 and the second adapter 15 in some embodiments of the present application, and Figure 11 is a schematic diagram of the orthographic projection of the first adapter 14 and the orthographic projection of the second adapter 15 in some embodiments of the present application. In Figure 11, the orthographic projection of the second connecting portion 141 is not filled with a pattern and is a blank area to distinguish it from the orthographic projection of the first connecting portion 140.

[0181] Along the thickness direction x of the first wall, the orthographic projection of the first connecting portion 140 is annular and surrounds the orthographic projection of the second connecting portion 141 . The orthographic projection of the second adapter 15 is outside the orthographic projection of the first connecting portion 140 .

[0182] The first connection portion 140 may extend along a circular trajectory, such that an orthographic projection of the first connection portion 140 in the thickness direction x of the first wall is annular.

[0183] "The orthographic projection of the first connecting portion 140 along the thickness direction x of the first wall is annular" may mean that the first connecting portion 140 may be strip-shaped, and the first connecting portion 140 may be a strip connected end to end. The orthographic projection of the first connecting portion 140 along the thickness direction x of the first wall may be a square ring, a central ring, a sector ring, or other ring shapes with a blank area in the middle.

[0184] In some embodiments, the first connection portion 140 may extend along an outer edge of the second connection portion 141 such that an orthographic projection of the first connection portion 140 in the thickness direction x of the first wall surrounds an orthographic projection of the second connection portion 141 .

[0185] “The orthographic projection of the second adapter 15 is located outside the orthographic projection of the first connecting portion 140 ” may mean that the first adapter 14 and the second adapter 15 are independent of each other and do not interfere with each other in any direction.

[0186] In the above technical solution, by arranging the orthographic projection of the first connecting portion 140 in a ring shape along the thickness direction x of the first wall, surrounding the orthographic projection of the second connecting portion 141, the contact connection between the first connecting portion 140 and the first wall 110 can be improved, thereby facilitating enhanced current flow capacity between the first tab 131 and the first wall 110. Furthermore, by arranging the orthographic projection of the second adapter 15 outside the orthographic projection of the first connecting portion 140, the risk of overlapping the first adapter 14 and the second adapter 15, causing an internal short circuit in the battery cell 10, can be effectively reduced, thereby enhancing the reliability of the battery 100.

[0187] In other embodiments, please refer to Figure 12, which is a schematic diagram of the first adapter 14 in other embodiments of the present application. The first adapter 14 includes a first connecting portion 140, a second connecting portion 141, and a transition portion 142. The first connecting portion 140 protrudes from the second connecting portion 141 and is connected to the second connecting portion 141 via the transition portion 142. The first connecting portion 140 is strip-shaped and extends along a serpentine trajectory.

[0188] According to some embodiments of the present application, referring to FIG. 10 , along the circumference of the electrode assembly 13 , the central angle corresponding to the first connecting portion 140 is α, satisfying 0<α≤180°.

[0189] The electrode assembly 13 may be a wound electrode assembly 13. The electrode assembly 13 may be a cylindrical structure, and the circumferential direction of the electrode assembly 13 may be the circumferential direction of the electrode assembly 13.

[0190] The central angle α corresponding to the first connecting portion 140 can be understood as follows: along the circumference of the electrode assembly 13, the first connecting portion 140 has two edges that are separated by a straight line with the two edges having an angle α. The central angle α corresponding to the first connecting portion 140 can also be understood as follows: the first connecting portion 140 can be fan-shaped, and the center of the circle corresponding to the first connecting portion 140 is on the axis of the electrode assembly 13.

[0191] In some embodiments, the central angle α corresponding to the first connecting portion 140 can be less than or equal to 180°, for example, α can be 180°, 179°, 178°, 177°…130°, 129°, 128°…120°, 119°…90°, 89°, 88° or smaller degrees.

[0192] In the above technical solution, by setting the central angle α corresponding to the first connecting part 140 to be less than or equal to 180°, on the one hand, the first connecting part 140 does not occupy too much space between the electrode assembly 13 and the first wall 110, so that there is a larger connection area between the second adapter 15 and the electrode terminal 12 and the second pole ear 132, so that the battery 100 has stronger performance; on the other hand, the first connecting part 140 can be kept away from the second adapter 15, reducing the risk of the first connecting part 140 and the second adapter 15 overlapping each other and causing an internal short circuit in the battery cell 10, so that the battery 100 has higher reliability.

[0193] In some other embodiments, along the circumference of the electrode assembly 13 , the central angle α corresponding to the first connecting portion 140 may also be greater than 180°.

[0194] According to some embodiments of the present application, 0<α≤120° is satisfied.

[0195] The central angle α corresponding to the first connecting portion 140 may be less than or equal to 120°, for example, α may be 120°, 119°, 118°, 117°…90°, 89°, 88°…45°, 44°…30°, 29°, 28° or smaller.

[0196] According to some embodiments of the present application, referring to FIG5 , the second adapter 15 includes a third connecting portion 150 and a fourth connecting portion 151. The third connecting portion 150 is connected to the electrode terminal 12, and the fourth connecting portion 151 is connected to the second electrode tab 132. Along the thickness direction x of the first wall, the orthographic projection of the third connecting portion 150 does not overlap with the orthographic projection of the fourth connecting portion 151.

[0197] The third connection portion 150 is a portion where the second adapter 15 is connected to the electrode terminal 12 , and the fourth connection portion 151 is a portion where the second adapter 15 is connected to the second electrode tab 132 .

[0198] In some embodiments, the second connecting member can be plate-shaped, the third connecting portion 150 and the fourth connecting portion 151 are connected to each other, the surface of the third connecting portion 150 facing the first wall 110 and the surface of the fourth connecting portion 151 facing the first wall 110 can be flush with each other, and the surface of the third connecting portion 150 facing the second pole ear 132 and the surface of the fourth connecting portion 151 facing the second pole ear 132 can be flush with each other.

[0199] In some embodiments, the third connecting portion 150 and the fourth connecting portion 151 are connected to each other, and the surface of the third connecting portion 150 facing the first wall 110 can be more protruding than the surface of the fourth connecting portion 151 facing the first wall 110, and the surface of the fourth connecting portion 151 facing the second pole ear 132 can be more protruding than the surface of the third connecting portion 150 facing the second pole ear 132.

[0200] “Along the thickness direction x of the first wall, the orthographic projection of the third connecting part 150 does not overlap with the orthographic projection of the fourth connecting part 151” can be understood as that the orthographic projection of the part where the second adapter 15 and the electrode terminal 12 are connected to each other does not overlap with the orthographic projection of the part where the second adapter 15 and the second electrode tab 132 are connected to each other in the thickness direction x of the first wall.

[0201] In the above technical solution, the third connecting portion 150 and the fourth connecting portion 151 respectively connect the electrode terminal 12 and the second tab 132, effectively improving the connection stability between the second tab 132 and the electrode terminal 12, reducing the risk of short circuit between the second tab 132 and the electrode terminal 12, and improving the reliability of the battery 100. Furthermore, along the thickness direction x of the first wall, by arranging the orthographic projection of the third connecting portion 150 and the orthographic projection of the fourth connecting portion 151 to not overlap, the second adapter 15 can be connected to the electrode terminal 12 and the second tab 132 at different locations, reducing the difficulty of assembling the second adapter 15, improving the manufacturing efficiency of the battery cell 10, and thereby improving the manufacturing efficiency of the battery 100.

[0202] In some other embodiments, along the thickness direction x of the first wall, the orthographic projection of the third connecting portion 150 may fall within the orthographic projection of the fourth connecting portion 151 , for example, the electrode terminal 12 is directly above the second electrode tab 132 .

[0203] According to some embodiments of the present application, the third connection portion 150 has a third surface 1500 that contacts the electrode terminal 12, and the fourth connection portion 151 has a fourth surface 1510 (see FIG. 13 ) that contacts the second electrode tab 132. Along the thickness direction x of the first wall, there is a height difference h2 (not shown) between the third surface 1500 and the fourth surface 1510, satisfying h2 ≤ 3 mm.

[0204] The third surface 1500 is the area where the third connecting portion 150 contacts the electrode terminal 12. In some embodiments, the third surface 1500 may be the surface of the third connecting portion 150 facing the first wall 110. The fourth surface 1510 is the area where the fourth connecting portion 151 contacts the second electrode tab 132. In some embodiments, the fourth surface 1510 may be the surface of the fourth connecting portion 151 facing the second electrode tab 132.

[0205] In some embodiments, along the thickness direction x of the first wall, there is a distance between the second electrode tab 132 and the electrode terminal 12, and a second adapter 15 is provided to connect the second electrode tab 132 and the electrode terminal 12. Along the thickness direction x of the first wall, a height difference h2 between the third surface 1500 and the fourth surface 1510 can correspond to the distance between the second electrode tab 132 and the electrode terminal 12.

[0206] h2 may be a value less than or equal to 3 mm, for example, h2 may be 3 mm, 2.5 mm, 2 mm or a smaller value.

[0207] In the above technical solution, by setting the height difference h2 between the third surface 1500 and the fourth surface 1510 to be less than or equal to 3 mm, on the one hand, the third surface 1500 of the third connecting portion 150 can be connected to the electrode terminal 12 to achieve stable transmission of current between the second tab 132 and the electrode terminal 12; on the other hand, it can reduce the risk of the second adapter 15 being too thick and interfering with the electrode terminal 12, resulting in the electrode terminal 12, the second adapter 15 or the second tab 132 being compressed and damaged, thereby improving the reliability of the battery 100.

[0208] According to some embodiments of the present application, the cross-sectional area of ​​the main body 130 is S, the area of ​​the third surface 1500 is S3, and the area of ​​the fourth surface 1510 is S4, satisfying S3+S4≤S / 2.

[0209] The cross-sectional area of ​​the main body 130 on a plane perpendicular to the thickness direction x of the first wall, or in other words, on a plane perpendicular to the axial direction of the main body 130, is S. In some embodiments, the cross-sectional area S of the main body 130 can be equal to the surface area of ​​the end surface of the main body 130 provided with the first electrode tab 131 and the second electrode tab 132. The end surface of the main body 130 provided with the first electrode tab 131 and the second electrode tab 132 can be a first end surface.

[0210] In some embodiments, along the thickness direction x of the first wall, the orthographic projection of the third surface 1500 and the orthographic projection of the fourth surface 1510 may not overlap, the area of ​​the third surface 1500 projected onto the first end surface may be S3, the area of ​​the fourth surface 1510 projected onto the first end surface may be S4, the area of ​​the first end surface may be S, and the sum of S3 and S4 may be less than or equal to S / 2. For example, S3+S4 may be S / 2, S / 3, S / 4 or other values.

[0211] In the above technical solution, by setting the sum of the area S3 of the third surface 1500 and the area S4 of the fourth surface 1510 to be no greater than half of the cross-sectional area S of the main body 130, on the one hand, a larger contact area can be provided between the second adapter 15 and the second pole tab 132, as well as between the second adapter 15 and the electrode terminal 12, so that the current is stably transmitted between the second pole tab 132 and the electrode terminal 12; on the other hand, the risk of the contact surface between the first adapter 14 and the first pole tab 131 or the contact area between the first adapter 14 and the first wall 110 being too small due to the second adapter 15 occupying too large an area, thereby affecting the positive and negative current output and input performance of the battery cell 10, so that the battery 100 has stronger performance.

[0212] According to some embodiments of the present application, referring to FIG4 , the electrode assembly 13 is a wound electrode assembly 13 , the main body 130 has a central through hole 1300 , the central through hole 1300 passes through the main body 130 along the axial direction of the main body 130 , and the third connecting portion 150 covers at least a portion of the central through hole 1300 .

[0213] The electrode assembly 13 is a wound electrode assembly 13, comprising a first electrode sheet and a second electrode sheet of opposite polarity, and a separator. The first electrode sheet, the second electrode sheet, and the separator are stacked and wound about a winding axis. The central through-hole 1300 is the central passage formed by the winding of the first electrode sheet, the second electrode sheet, and the separator. The central through-hole 1300 extends through both ends of the main body 130 in the thickness direction x of the first wall.

[0214] The fourth connecting portion 151 of the second adapter 15 can cover the second electrode ear 132 at the end face of the main body 130, and the third connecting portion 150 is connected to the fourth connecting portion 151 and extends toward the central through hole 1300 so as to cover at least a portion of the central through hole 1300. Correspondingly, the orthographic projection of the electrode terminal 12 in the thickness direction x of the first wall can cover at least a portion of the central through hole 1300.

[0215] In the above technical solution, by setting the third connecting portion 150 to cover at least a portion of the central through hole 1300, on the one hand, the second adapter 15 can reasonably utilize the space between the electrode assembly 13 and the first wall 110 corresponding to the central through hole 1300, so that the second adapter 15 has a larger surface area, which is beneficial to the transmission of current between the second pole ear 132 and the electrode terminal 12, and is beneficial to the improvement of the performance of the battery 100; on the other hand, at least a portion of the third connecting portion 150 can be kept away from the second pole ear 132, that is, the connection part between the second adapter 15 and the electrode terminal 12 and the connection part between the second adapter 15 and the second pole ear 132 are kept away from each other, thereby reducing the difficulty of assembling the second adapter 15 and improving the manufacturing efficiency of the battery 100.

[0216] According to some embodiments of the present application, please refer to FIG. 13 , which is a schematic diagram of the insulating member 16 , the first adapter 14 , and the second adapter 15 in some embodiments of the present application.

[0217] The battery cell 10 further includes an insulating member 16 . The insulating member 16 is located between the electrode assembly 13 and the first wall 110 . The insulating member 16 insulates and isolates the first adapter 14 from the second adapter 15 .

[0218] The insulating member 16 is disposed between the electrode assembly 13 and the first wall 110 . The insulating member 16 has insulating properties and can insulate and isolate the first adapter 14 from the second adapter 15 . In some embodiments, the insulating member 16 can be in the form of a sheet, plate, or ring. In some embodiments, the insulating member 16 can be a rubber member, a silicone member, or a plastic member. In some embodiments, the insulating member 16 is made of an insulating material, such as polypropylene, polyethylene, or other insulating material. The insulating member 16 can be the lower plastic of the battery cell 10 .

[0219] In the above technical solution, by providing an insulating member 16 to insulate and isolate the first adapter 14 and the second adapter 15, the risk of the first adapter 14 and the second adapter 15 overlapping each other and causing an internal short circuit in the battery cell 10 can be reduced, so that the battery 100 has higher reliability.

[0220] According to some embodiments of the present application, referring to FIG13 , the insulating member 16 includes an insulating body 160 and a separator 161. The insulating body 160 is an annular structure arranged along the circumference of the electrode assembly 13. The insulating body 160 insulates and isolates the second adapter 15 and the outer shell 11. The separator 161 is connected to the inner annular surface of the insulating body 160. The separator 161 insulates and isolates the first adapter 14 and the second adapter 15.

[0221] The insulating body 160 is annular and can be disposed along the circumference of the electrode assembly 13 and surround the electrode assembly 13. A portion of the insulating body 160 can be disposed outside the second adapter 15 to insulate and isolate the second adapter 15 from the housing 111. In the direction from the electrode assembly 13 to the first wall 110, a portion of the insulating body 160 can extend beyond the second adapter 15 to insulate and isolate the second adapter 15 from the first wall 110.

[0222] The insulating body 160 can be disposed between the electrode assembly 13 and the first wall 110. The first electrode tab 131 and the second electrode tab 132 can support the lower surface of the insulating body 160, or the lower surface of the insulating body 160 is supported by the end surface of the main body 130. The upper surface of the insulating body 160 faces the first wall 110. The partition 161 is disposed within the insulating body 160 to divide the internal space of the insulating body 160 into two subspaces, one of which accommodates the first adapter 14 and the other accommodates the second adapter 15.

[0223] In the above technical solution, by providing the insulating member 16, the risk of the first adapter 14 and the second adapter 15 overlapping and causing an internal short circuit in the battery cell 10 can be effectively reduced, so that the battery 100 has higher reliability; wherein, the insulating member 16 includes a ring-shaped insulating body 160, which can effectively insulate and isolate the second adapter 15 and the outer shell 11, thereby effectively reducing the risk of the second adapter 15 and the outer shell 11 overlapping and causing an internal short circuit in the battery cell 10, so that the battery 100 has higher reliability.

[0224] According to some embodiments of the present application, the electrode assembly 13 includes a first electrode piece and a second electrode piece, and the electrode assembly 13 is a wound electrode assembly 13. The first electrode piece includes a plurality of first sub-electrode tabs 1311, which form a first electrode tab 131. The first electrode piece of the innermost n1 turns is not provided with a first sub-electrode tab 1311, where n1 ≥ 1. And / or, the second electrode piece includes a plurality of second sub-electrode tabs 1321, which form a second electrode tab 132. The second electrode piece of the innermost n2 turns is not provided with a second sub-electrode tab 1321, where n2 ≥ 1.

[0225] The electrode assembly 13 is a wound electrode assembly 13, 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 1300 is formed in the center of the main body 130.

[0226] In some embodiments, the wound electrode assembly 13 includes multiple turns of a first electrode sheet, and the first electrode tab 131 includes multiple first sub-electrode tabs 1311. The number of first sub-electrode tabs 1311 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 1311, such as the first electrode sheet of the innermost first and second turns. This allows a certain distance between the first electrode tab 131 and the central through hole 1300. The value of n1 can be 1 or an integer greater than 1. For example, the first electrode sheet of the innermost one, innermost two, innermost three, innermost four, or innermost more turns is not provided with a first sub-electrode tab 1311. See FIG. 14, which is a top view of the electrode assembly 13 in some embodiments of the present application. A certain distance exists between the edge of the first electrode tab 131 closest to the central through hole 1300 and the central through hole 1300.

[0227] In some embodiments, the wound electrode assembly 13 includes multiple turns of a second electrode sheet, and the second electrode tab 132 includes multiple second sub-electrode tabs 1321. The number of second sub-electrode tabs 1321 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 1321, such as the second electrode sheet of the innermost first and second turns is not provided with a second sub-electrode tab 1321, so that there is a certain distance between the second electrode tab 132 and the central through hole 1300. 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 1321. As shown in FIG. 14, there is a certain distance between the edge of the second electrode tab 132 closest to the central through hole 1300 and the central through hole 1300.

[0228] In the above technical solution, by not providing the first sub-tab 1311 on the first pole piece of the innermost n1 turn, the first pole tab 131 and the second pole tab 132 can be effectively spaced apart, thereby reducing the risk of short circuit between the first pole tab 131 and the second pole tab 132, which is beneficial to improving the reliability of the battery 100. Similarly, by not providing the second sub-tab 1321 on the second pole piece of the innermost n2 turn, the second pole tab 132 and the first pole tab 131 can be effectively spaced apart, thereby reducing the risk of short circuit between the second pole tab 132 and the first pole tab 131, which is beneficial to improving the reliability of the battery 100.

[0229] According to some embodiments of the present application, the electrode assembly 13 includes a first electrode sheet and a second electrode sheet, and the electrode assembly 13 is a wound electrode assembly 13. The first electrode sheet includes a plurality of first sub-electrode tabs 1311, which form a first electrode tab 131. The first electrode sheet in the outermost m1 circle is not provided with a first sub-electrode tab 1311, and m1 ≥ 1. And / or, the second electrode sheet includes a plurality of second sub-electrode tabs 1321, which form a second electrode tab 132. The second electrode sheet in the outermost m2 circle is not provided with a second sub-electrode tab 1321, and m2 ≥ 1.

[0230] The electrode assembly 13 is a wound electrode assembly 13 , 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.

[0231] In some embodiments, the wound electrode assembly 13 includes multiple turns of a first electrode sheet, and the first electrode tab 131 includes multiple first sub-electrode tabs 1311. The number of first sub-electrode tabs 1311 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 the first sub-electrode tab 1311, such as the first electrode sheet of the outermost first and second turns is not provided with the first sub-electrode tab 1311, so that there is a certain distance between the first electrode tab 131 and the outer peripheral surface of the main body 130. 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 the first sub-electrode tab 1311. As shown in Figure 14, there is a certain distance between the edge of the first electrode tab 131 closest to the outer peripheral surface of the main body 130 and the outer peripheral surface of the main body 130.

[0232] In some embodiments, the wound electrode assembly 13 includes multiple turns of a second electrode sheet, and the second electrode tab 132 includes multiple second sub-electrode tabs 1321. The number of second sub-electrode tabs 1321 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 1321, such as the second electrode sheet of the outermost first and second turns is not provided with a second sub-electrode tab 1321, so that there is a certain distance between the second electrode tab 132 and the outer peripheral surface of the main body 130. 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 1321. As shown in Figure 14, there is a certain distance between the edge of the second electrode tab 132 closest to the outer peripheral surface of the main body 130 and the outer peripheral surface of the main body 130.

[0233] According to some embodiments of the present application, the electrode assembly 13 is a wound electrode assembly 13, and the first electrode tab 131 includes a plurality of first sub-electrode tabs 1311, each of which has the same size in the winding direction of the electrode assembly 13. Alternatively, along the direction from the inner circle to the outer circle of the electrode assembly 13, the sizes of the plurality of first sub-electrode tabs 1311 in the winding direction of the electrode assembly 13 gradually increase.

[0234] The electrode assembly 13 is a wound electrode assembly 13 , 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.

[0235] The wound electrode assembly 13 includes multiple turns of a first electrode sheet, and the first electrode tab 131 includes multiple first sub-electrode tabs 1311. The number of first sub-electrode tabs 1311 can be equal to or less than the number of turns of the first electrode sheet. The phrase "each first sub-electrode tab 1311 has the same dimensions in the winding direction of the electrode assembly 13" can be understood as meaning that adjacent first sub-electrode tabs 1311 have the same dimensions in the winding direction, so that the first electrode tabs 131 have a regular shape, for example, a square shape, or a substantially square shape. The phrase "the dimensions of the multiple first sub-electrode tabs 1311 gradually increase in the winding direction of the electrode assembly 13 from the inner circle to the outer circle" can be understood as meaning that, along two adjacent first sub-electrode tabs 1311, the first sub-electrode tab 1311 on the inner circle has a smaller dimension in the winding direction than the first sub-electrode tab 1311 on the outer circle. Illustratively, along the direction from the inner circle to the outer circle of the electrode assembly 13, the sizes of the multiple first sub-electrode tabs 1311 in the winding direction of the electrode assembly 13 gradually increase, and the surface of the first electrode tab 131 is fan-shaped, or approximately fan-shaped (see Figure 14).

[0236] In the above technical solution, in some embodiments, by setting the dimensions of each first sub-tab 1311 in the winding direction of the electrode assembly 13 to be the same, the processing difficulty of the first sub-tab 1311 can be reduced (for example, when die-cutting the tab, each first sub-tab 1311 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 1311 in the winding direction of the electrode assembly 13 to gradually increase from the inner circumference to the outer circumference, the first tab 131 can fully utilize the internal space of the housing 11, thereby providing the first tab 131 with a larger area, thereby improving the flow capacity between the first tab 131 and the electrode terminal 12, and thus improving the charge and discharge performance of the battery 100.

[0237] According to some embodiments of the present application, the electrode assembly 13 is a wound electrode assembly 13, and the second electrode tab 132 includes a plurality of second sub-electrode tabs 1321, each of which has the same size in the winding direction of the electrode assembly 13. Alternatively, along the direction from the inner circle to the outer circle of the electrode assembly 13, the sizes of the plurality of second sub-electrode tabs 1321 in the winding direction of the electrode assembly 13 gradually increase.

[0238] The wound electrode assembly 13 includes multiple turns of the second electrode sheet, and the second electrode tab 132 includes multiple second sub-electrode tabs 1321. The number of the second sub-electrode tabs 1321 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.

[0239] “Each second sub-electrode tab 1321 has the same size in the winding direction of the electrode assembly 13” can be understood as adjacent second sub-electrode tabs 1321 have the same size in the winding direction, so that the second electrode tab 132 has a regular shape, for example, the second electrode tab 132 is square, or the second electrode tab 132 is approximately square (see Figure 14).

[0240] The phrase "the dimensions of the plurality of second sub-electrode tabs 1321 gradually increase in the winding direction of the electrode assembly 13, along the direction from the inner ring to the outer ring" can be understood as meaning that, along two adjacent second sub-electrode tabs 1321, the dimension of the second sub-electrode tab 1321 on the inner ring, along the winding direction, is smaller than the dimension of the second sub-electrode tab 1321 on the outer ring. For example, the dimensions of the plurality of first sub-electrode tabs 1311 gradually increase in the winding direction of the electrode assembly 13, along the direction from the inner ring to the outer ring of the electrode assembly 13, and the surface of the first electrode tab 131 is fan-shaped, or approximately fan-shaped.

[0241] In the above technical solution, in some embodiments, by setting the size of each second sub-tab 1321 in the winding direction of the electrode assembly 13 to be the same, the processing difficulty of the second sub-tab 1321 can be reduced (for example, when die-cutting the tab, each second sub-tab 1321 has the same die-cut size, so the die-cutting efficiency is high), 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 13, by setting the sizes of the plurality of second sub-tabs 1321 in the winding direction of the electrode assembly 13 to gradually increase, the second tab 132 can fully utilize the internal space of the housing 11, so that the second tab 132 has a larger area, thereby improving the flow capacity between the second tab 132 and the housing 11, and thus the battery 100 has better charge and discharge performance.

[0242] According to some embodiments of the present application, please refer to Figure 15, which is a top view of the electrode assembly 13 in some embodiments of the present application.

[0243] The first electrode tab 131 has a fifth surface 1310 facing the first wall 110 , and the fifth surface 1310 is fan-shaped.

[0244] The fifth surface 1310 is the surface of the first tab 131 facing the first wall 110 . In some embodiments, the fifth surface 1310 is the surface electrically connected to the first tab 131 and the first adapter 14 . For example, the fifth surface 1310 is connected to the second connection portion 141 of the first adapter 14 .

[0245] “The fifth surface 1310 is fan-shaped” can be understood as that the fifth surface 1310 extends in an arc-shaped trajectory. For example, the end face of the electrode assembly 13 is circular, and the fifth surface 1310 extends circumferentially along the end face of the electrode assembly 13 to form a fan with the center of the end face of the electrode assembly 13 as the center of the circle.

[0246] In the above technical solution, by setting the fifth surface 1310 of the first pole tab 131 to a fan-shaped structure, the first pole tab 131 can fully utilize the internal space of the shell 11, so that the first pole tab 131 has a larger area to improve the flow capacity between the first pole tab 131 and the first wall 110, so that the battery 100 has better charge and discharge performance.

[0247] According to some embodiments of the present application, along the circumferential direction y of the main body, the fifth surface 1310 has a first edge 13100 and a second edge 13101 that are far away from each other, and the angle between the first edge 13100 and the second edge 13101 is β1, 0<β1≤180°.

[0248] In some embodiments, the arc-shaped trajectory of the fifth surface 1310 is parallel to the circumferential direction y of the main body, and the center of the circle corresponding to the fifth surface 1310 can be located on the central axis of the main body 130 .

[0249] The first edge 13100 and the second edge 13101 are two edges of the fifth surface 1310 that are away from each other on its arc-shaped trajectory. The angle between the first edge 13100 and the second edge 13101 may correspond to the central angle of the fan-shaped fifth surface 1310 .

[0250] In some embodiments, the angle β1 between the first edge 13100 and the second edge 13101 is less than or equal to 180°. For example, the angle β1 between the first edge 13100 and the second edge 13101 can be 1°, 2°…45°, 46°, 47°…90°, 91°, 92°…180° or any value between two adjacent values.

[0251] In the above technical solution, by setting the angle β1 formed between the first edge 13100 and the second edge 13101 of the first pole tab 131 to be less than or equal to 180 degrees, the central angle of the fifth surface 1310 of the fan-shaped first pole tab 131 is less than or equal to 180 degrees, so as to alleviate the phenomenon that the first pole tab 131 and the second pole tab 132 are easily overlapped due to the large space occupied by the first pole tab 131, resulting in an internal short circuit of the battery cell 10, thereby making the battery 100 have higher reliability.

[0252] According to some embodiments of the present application, the second electrode tab 132 has a sixth surface 1320 facing the first wall 110 , and the sixth surface 1320 is fan-shaped.

[0253] The sixth surface 1320 is the surface of the second electrode tab 132 facing the first wall 110 . In some embodiments, the sixth surface 1320 is the surface where the second electrode tab 132 is electrically connected to the second adapter 15 .

[0254] “The sixth surface 1320 is fan-shaped” can be understood as that the sixth surface 1320 extends in an arc-shaped trajectory. For example, the end face of the electrode assembly 13 is circular, and the sixth surface 1320 extends circumferentially along the end face of the electrode assembly 13 to form a fan with the center of the end face of the electrode assembly 13 as the center of the circle.

[0255] In the above technical solution, by setting the sixth surface 1320 of the second pole tab 132 to a fan-shaped structure, the second pole tab 132 can fully utilize the internal space of the shell 11, so that the second pole tab 132 has a larger area to improve the flow capacity between the second pole tab 132 and the electrode terminal 12, so that the battery 100 has better charge and discharge performance.

[0256] According to some embodiments of the present application, along the circumferential direction y of the main body, the sixth surface 1320 has a third edge 13200 and a fourth edge 13201 that are far away from each other, and the angle between the third edge 13200 and the fourth edge 13201 is β2, 0<β2≤270°.

[0257] In some embodiments, the arc-shaped trajectory of the sixth surface 1320 is parallel to the circumferential direction y of the main body, and the center of the circle corresponding to the sixth surface 1320 can be located on the central axis of the main body 130 .

[0258] The third edge 13200 and the fourth edge 13201 are two edges of the sixth surface 1320 that are away from each other on its arc-shaped trajectory. The angle between the third edge 13200 and the fourth edge 13201 may correspond to the central angle of the sector-shaped sixth surface 1320 .

[0259] In some embodiments, the angle β2 between the third edge 13200 and the fourth edge 13201 is less than or equal to 270°. For example, the angle β2 between the third edge 13200 and the fourth edge 13201 can be 1°, 2°…45°, 46°, 47°…90°, 91°, 92°…179°, 180°…268°, 269°, 270° or any value between two adjacent values.

[0260] In the above technical solution, by setting the angle β2 formed between the third edge 13200 and the fourth edge 13201 of the second pole tab 132 to be less than or equal to 270 degrees, the central angle of the second surface 1410 of the fan-shaped second pole tab 132 is less than or equal to 270 degrees, so as to alleviate the phenomenon that the second pole tab 132 and the first pole tab 131 are easily overlapped due to the large space occupied by the second pole tab 132, resulting in an internal short circuit of the battery cell 10, thereby making the battery 100 have higher reliability.

[0261] According to some embodiments of the present application, a battery 100 is further provided. The battery 100 includes the battery cell 10 provided above.

[0262] As shown in FIG. 2 , the battery 100 may further include a box body 20 , in which the battery cells 10 are accommodated.

[0263] 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 .

[0264] 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.

[0265] 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.

[0266] Optionally, the battery cell 10 disposed within the housing 20 may be one or more. For example, in FIG2 , the housing 20 of the battery 100 includes multiple battery cells 10. These multiple battery cells 10 may be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to multiple battery cells 10 being 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 within the housing 20.

[0267] 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 .

[0268] 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.

[0269] According to some embodiments of the present application, some embodiments of the present application further provide an electrical device, which includes the battery cell 10 provided above, and the battery cell 10 is used to provide electrical energy.

[0270] According to some embodiments of the present application, a battery cell 10 is provided, see Figures 3 to 13. The battery cell 10 includes a shell 11, an electrode terminal 12, an electrode assembly 13, a first adapter 14, a second adapter 15, and an insulating member 16. The shell 11 has a first wall 110. The electrode terminal 12 is insulated and mounted on the first wall 110. The electrode assembly 13 is accommodated in the shell 11, and the electrode assembly 13 includes a main body 130, a first pole tab 131 and a second pole tab 132. The polarities of the first pole tab 131 and the second pole tab 132 are opposite. Along the thickness direction x of the first wall, the first pole tab 131 and the second pole tab 132 are both arranged at one end of the main body 130 facing the first wall 110. The first adapter 14 connects the first wall 110 and the first pole tab 131. The second adapter 15 connects the electrode terminal 12 and the second pole tab 132. The insulating member 16 is located between the electrode assembly 13 and the first wall 110, insulating and isolating the first adapter 14 from the second adapter 15. Along the thickness direction x of the first wall, the orthographic projection of the first adapter 14 and the orthographic projection of the second adapter 15 do not overlap. By ensuring that the orthographic projection of the first adapter 14 does not overlap with the orthographic projection of the second adapter 15, the risk of overlapping first and second adapters 14, 15, and thus causing an internal short circuit in the battery cell 10, is reduced, thereby enhancing the reliability of the battery 100.

[0271] The first adapter 14 includes a first connecting portion 140 and a second connecting portion 141 . The first connecting portion 140 is connected to the first wall 110 , and the second connecting portion 141 is connected to the first tab 131 .

[0272] Referring to Figures 5 and 6 , the first connecting portion 140 is annular and circular, and the second adapter 15 is located within the area enclosed by the first connecting portion 140, but there is no contact between the first connecting portion 140 and the second adapter 15. The second connecting portion 141 is fan-shaped and can be connected to the fan-shaped first terminal tab 131.

[0273] Referring to Figure 9 , the second connecting portion 141 is fan-shaped, and the first connecting portion 140 is located outside the second connecting portion 141. The first connecting portion 140 is connected to the outer edge of the second connecting portion 141 via a transition portion 142. The first connecting portion 140 is arc-shaped and extends away from the second adapter 15. The central angle corresponding to the first connecting portion 140 is α, α≤180°. In some embodiments, α≤120°.

[0274] Referring to Figures 10 and 11, the first connecting portion 140 is annular. The first connecting portion 140 can extend along the outer edge of the second connecting portion 141 so that the orthographic projection of the first connecting portion 140 in the thickness direction x of the first wall surrounds the orthographic projection of the second connecting portion 141. The first adapter 14 and the second adapter 15 are independent of each other, and the two are separated from each other and do not interfere with each other in any direction. As can be seen in Figure 10, the first connecting portion 140 is fan-shaped, and the central angle corresponding to the first connecting portion 140 is α, α≤180°, and in some embodiments, α≤120°.

[0275] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery cell, wherein: include: a housing having a first wall; an electrode terminal, insulated and mounted on the first wall; an electrode assembly, contained in the housing, comprising a main body, a first electrode tab and a second electrode tab, wherein the first electrode tab and the second electrode tab have opposite polarities, and along the thickness direction of the first wall, the first electrode tab and the second electrode tab are both arranged at one end of the main body facing the first wall; A first adapter, the first adapter comprising a first connecting portion and a second connecting portion, the first connecting portion being connected to the first wall, and the second connecting portion being connected to the first electrode tab; A second adapter, the second adapter connecting the electrode terminal and the second electrode tab; Among them, along the thickness direction of the first wall, the orthographic projection of the first adapter does not overlap with the orthographic projection of the second adapter, and along the thickness direction of the first wall, the orthographic projection of the first connecting portion does not overlap with the orthographic projection of the second pole ear.

2. The battery cell according to claim 1, wherein: The first connecting portion has a first surface in contact with the first wall, and the second connecting portion has a second surface in contact with the first electrode tab; Along the thickness direction of the first wall, there is a height difference h1 between the first surface and the second surface, and h1≤3 mm.

3. The battery cell according to claim 2, wherein: The cross-sectional area of ​​the main body is S, the area of ​​the first surface is S1, and the area of ​​the second surface is S2, satisfying S1+S2≤S / 2.

4. The battery cell according to any one of claims 1 to 3, wherein: The first adapter also includes a transition portion, which extends from an edge of the second connection portion toward a direction close to the first wall, and connects the first connection portion and the second connection portion.

5. The battery cell according to any one of claims 1 to 4, wherein: Along the thickness direction of the first wall, the orthographic projection of the first connecting portion is arc-shaped.

6. The battery cell according to any one of claims 1 to 4, wherein: Along the thickness direction of the first wall, the orthographic projection of the first connecting portion is annular, and the orthographic projection of the first connecting portion surrounds the orthographic projection of the second connecting portion, and the orthographic projection of the second adapter is located outside the orthographic projection of the first connecting portion.

7. The battery cell according to any one of claims 1 to 6, wherein: Along the circumference of the electrode assembly, the central angle corresponding to the first connecting portion is α, satisfying 0<α≤180°.

8. The battery cell according to claim 7, wherein: Satisfies, 0<α≤120°.

9. The battery cell according to any one of claims 1 to 8, wherein: The second adapter comprises a third connecting portion and a fourth connecting portion, the third connecting portion is connected to the electrode terminal, and the fourth connecting portion is connected to the second electrode tab; Along the thickness direction of the first wall, an orthographic projection of the third connecting portion does not overlap with an orthographic projection of the fourth connecting portion.

10. The battery cell according to claim 9, wherein: The third connection portion has a third surface in contact with the electrode terminal, and the fourth connection portion has a fourth surface in contact with the second electrode tab; Along the thickness direction of the first wall, there is a height difference h2 between the third surface and the fourth surface, satisfying h2≤3 mm.

11. The battery cell according to claim 10, wherein: The cross-sectional area of ​​the main body is S, the area of ​​the third surface is S3, and the area of ​​the fourth surface is S4, satisfying S3+S4≤S / 2.

12. The battery cell according to any one of claims 9 to 11, wherein: The electrode assembly is a wound electrode assembly, the main body has a central through hole, the central through hole penetrates the main body along the axial direction of the main body, and the third connecting part covers at least a portion of the central through hole.

13. The battery cell according to any one of claims 1 to 12, wherein: The battery cell further includes an insulating member, the insulating member being located between the electrode assembly and the first wall, and the insulating member insulatingly separating the first transition member and the second transition member.

14. The battery cell according to claim 13, wherein: The insulating member includes an insulating body and a partition portion. The insulating body is an annular structure arranged along the circumference of the electrode assembly. The insulating body insulates and isolates the second adapter and the outer shell. The partition portion is connected to the inner annular surface of the insulating body. The partition portion insulates and isolates the first adapter and the second adapter.

15. The battery cell according to any one of claims 1 to 14, 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.

16. The battery cell according to any one of claims 1 to 15, 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, and 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-electrode is arranged, 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.

17. The battery cell according to any one of claims 1 to 16, 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.

18. The battery cell according to any one of claims 1 to 17, 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.

19. The battery cell according to any one of claims 1 to 18, wherein: The first electrode tab has a fifth surface facing the first wall, and the fifth surface is fan-shaped.

20. The battery cell according to claim 19, wherein: Along the circumference of the main body, the fifth 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≤180°.

21. The battery cell according to any one of claims 1 to 20, wherein: The second electrode tab has a sixth surface facing the first wall, and the sixth surface is fan-shaped.

22. The battery cell according to claim 21, wherein: Along the circumference of the main body, the sixth 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≤270°.

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.

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