Battery cell, battery pack, and electric device

Abstract

A battery cell (500), a battery pack (400), and an electric device (1000). The battery cell (500) comprises a casing (510), an electrode assembly (520), and an adapter (100). The casing (510) is provided with two electrode terminals (511, 512). The electrode assembly (520) comprises two tabs (521, 522) having opposite polarities. The adapter (100) is provided between the electrode assembly (520) and the casing (510) and comprises two adapter portions (110, 120). The first adapter portion (110) is connected to the first electrode terminal (511) and the first tab (521). The second adapter portion (120) is electrically connected to the second electrode terminal (512) and the second tab (522). Part of the first adapter portion (110) and part of the second adapter portion (120) overlap in the axial direction of the battery cell (500).

Description

Battery cells, battery packs and electrical devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application "Battery Cell, Battery Pack and Electrical Device" with application number 202323293606.2 and application date December 1, 2023, and claims the priority of the above-mentioned Chinese patent application. The entire content of the above-mentioned Chinese patent application is hereby introduced into this application as a reference. Technical Field

[0003] The present application belongs to the field of battery technology, and specifically relates to a battery cell, a battery pack, and an electrical device. Background Art

[0004] Batteries, especially cylindrical batteries, are widely used in electric vehicles, consumer digital products, and other fields due to their uniform standards, high energy density, good cycle performance, and portability. To reduce battery size, increase energy density, or facilitate connection between multiple batteries, the positive and negative tabs are typically located on the same side of the battery, meaning that the positive and negative electrodes are connected from the same side.

[0005] However, when the positive and negative electrodes of existing batteries are led out on the same side, the flow area of ​​the positive and negative current collecting plates is small, resulting in large resistance, making it impossible to achieve high-power flow, and affecting the battery's performance.

[0006] Summary of the Invention

[0007] To this end, the first aspect of the present application proposes a battery cell, the adapter of which has sufficient flow area to solve the technical problems in the prior art that the positive electrode collector plate and the negative electrode collector plate have small flow area, large resistance, and cannot achieve high-power flow, thereby ensuring the performance of the battery cell to a certain extent.

[0008] According to an embodiment of the present application, a battery cell includes: a shell, the shell is provided with a first electrode terminal and a second electrode terminal; an electrode assembly, the electrode assembly includes a first pole tab and a second pole tab with opposite polarities; a adapter, the adapter is arranged between the electrode assembly and the shell and includes a first adapter portion and a second adapter portion, the first adapter portion is electrically connected to the first electrode terminal and the first pole tab, respectively, the second adapter portion is electrically connected to the second electrode terminal and the second pole tab, and at least parts of the first adapter portion and the second adapter portion are overlapped in the axial direction of the battery cell.

[0009] According to the battery cell of the embodiment of the present application, by arranging at least part of the first adapter part and the second adapter part to overlap in the axial direction of the battery cell, the area of ​​the first adapter part and the second adapter part can be increased, thereby improving the current flow capacity of the first adapter part and the second adapter part, that is, improving the current flow capacity of the adapter, achieving high-power current flow, and improving the working performance of the battery cell.

[0010] Optionally, the first transition portion includes a first connection end, a second connection end, and a first intermediate portion, wherein the first connection end is electrically connected to the first tab, the second connection end is electrically connected to the first electrode terminal, and the first intermediate portion is electrically connected to the first and second connection ends, respectively. The second transition portion includes a third connection end, a fourth connection end, and a second intermediate portion, wherein the third connection end is electrically connected to the second tab, the fourth connection end is electrically connected to the second electrode terminal, and the second intermediate portion is electrically connected to the third and fourth connection ends, respectively. In a first direction, the first and third connection ends are spaced apart, the second and fourth connection ends are spaced apart, and the first and second intermediate portions overlap in the axial direction of the battery cell, with the first direction intersecting the axial direction. This increases the area of ​​the first and second intermediate portions, thereby improving their current carrying capacity, that is, improving the current carrying capacity of the first and second transition portions, achieving high-power current carrying, and enhancing the operating performance of the battery cell.

[0011] Optionally, the first middle portion includes a first protruding portion that protrudes from the first connection end toward the second transition portion; and / or the second middle portion includes a second protruding portion that protrudes from the third connection end toward the first transition portion. This allows the first and second middle portions to effectively overlap in the axial direction of the battery cell, thereby ensuring the area of ​​the first and second middle portions to a certain extent and improving the current flow capacity of the first and second middle portions, that is, improving the current flow capacity of the first and second transition portions.

[0012] Optionally, the protruding length of the first protruding portion does not exceed the second middle portion, and the protruding length of the second protruding portion does not exceed the first middle portion. This ensures the flow area of ​​the first and second middle portions to a certain extent, while also preventing the first protruding portion from protruding beyond the second protruding portion and electrically connecting with the second transition portion, the second electrode terminal, and / or the second tab, and also preventing the second protruding portion from protruding beyond the first protruding portion and electrically connecting with the first transition portion, the first electrode terminal, and / or the first tab, thereby ensuring the operating performance of the battery cell to a certain extent.

[0013] Optionally, the width of the first and / or second middle portions in the first direction is w, and the diameter of the battery cell is D, where 3mm ≤ w ≤ D - 2mm. This ensures the area of ​​the first and second middle portions to a certain extent, reduces the cost of using the first and second middle portions, and prevents the first and second middle portions from extending beyond the battery cell and electrically connecting to other structural components, thereby ensuring the operating performance of the battery cell to a certain extent.

[0014] Optionally, 6mm≤w≤D-4mm. The areas of the first and second middle parts are further guaranteed to a certain extent, and the first and second middle parts are prevented from exceeding the battery cell and being electrically connected to other structural parts to a certain extent, so as to ensure the working performance of the battery cell to a certain extent.

[0015] Optionally, the first transition portion is formed as a bent member, with the first connecting end, the first middle portion, and the second connecting end stacked in a second direction, the second direction intersecting the first direction; and the second transition portion is formed as a bent member, with the third connecting end, the second middle portion, and the fourth connecting end stacked in the second direction. This facilitates connecting two structural members spaced apart in the second direction using the first transition portion, and facilitates connecting two structural members spaced apart in the second direction using the second transition portion, thereby reducing the difficulty of connecting two structural members spaced apart in the second direction, and facilitating reduction in the radial dimensions of the battery cell, thereby reducing the difficulty of assembling the battery cell.

[0016] Optionally, the first adapter is a copper adapter, and the second adapter is an aluminum adapter. This allows the first and second adapters to work together to electrically connect the positive electrode of the electrode assembly to the positive terminal of the housing, and to electrically connect the negative electrode of the electrode assembly to the negative terminal of the housing, respectively, thereby ensuring the operating performance of the battery cell to a certain extent.

[0017] Optionally, the adapter further includes a first insulating member, which is located at least between the first middle portion and the second middle portion in the overlapping direction. This ensures that the first middle portion and the second middle portion form an insulating fit, thereby preventing electrical connection between the first middle portion and the second middle portion to a certain extent, that is, preventing electrical connection between the first adapter portion and the second adapter portion to a certain extent, thereby ensuring the operating performance and reliability of the battery cell to a certain extent.

[0018] Optionally, at least one of the first intermediate portion and the second intermediate portion is provided with a first positioning structure for positioning the first insulating member. Using the first positioning structure to position the first insulating member can improve the positional stability of the first insulating member, allowing the first insulating member to be stably positioned between the first protruding portion and the second protruding portion, thereby preventing electrical connection between the first protruding portion and the second protruding portion to a certain extent, and also reducing the difficulty of positioning the first insulating member.

[0019] Optionally, the first positioning structure is a positioning hole, and a portion of the first insulating member is received in the first positioning structure. This allows the first positioning structure to be positioned in coordination with the first insulating member, thereby facilitating positioning of the first insulating member using the first positioning structure, improving the positional stability of the first insulating member, and reducing the difficulty of positioning the first insulating member.

[0020] Optionally, the first middle portion is provided with a first receiving groove for accommodating the first insulating member; and / or the second middle portion is provided with a second receiving groove for accommodating the first insulating member. This allows the first insulating member to be effectively positioned between the first protruding portion and the second protruding portion, thereby reducing the difficulty of assembling the first insulating member.

[0021] Optionally, a portion of the first transition portion is deformed to define the first receiving groove; and / or a portion of the second transition portion is deformed to define the second receiving groove, thereby reducing the difficulty of forming the first receiving groove and / or the second receiving groove.

[0022] Optionally, the first intermediate portion protrudes away from the second intermediate portion to form a first receiving groove for accommodating the first insulating member between the first and second intermediate portions. In other words, by providing the first receiving groove for accommodating the first insulating member directly on the first intermediate portion, the first insulating member can be effectively positioned between the first and second intermediate portions while also avoiding the need to, to a certain extent, create a groove on the second intermediate portion, thereby reducing the difficulty of forming the receiving groove and, consequently, easing the difficulty of assembling the first insulating member.

[0023] Optionally, the depth of the first receiving groove is greater than the thickness of the first insulating member, so as to ensure that the first insulating member can be effectively disposed in the first receiving groove, thereby facilitating the placement of the first insulating member between the first middle portion and the second middle portion, and facilitating the use of the first receiving groove to secure the first insulating member, thereby improving the positional stability of the first insulating member.

[0024] Optionally, the depth of the first receiving groove is equal to the thickness of the first insulating member. This allows the first insulating member to be effectively disposed within the first receiving groove while also allowing the second middle portion to directly overlap the first receiving groove during assembly. This, to a certain extent, avoids the need for providing a clearance groove on the second middle portion to avoid the first insulating member or providing a mating protrusion on the second middle portion to fit within the first receiving groove. This reduces the difficulty of molding the second middle portion and ensures a certain degree of surface flatness.

[0025] Optionally, the thickness of the first insulating member is 0.3 mm to 0.7 mm, which can ensure the insulation performance of the first insulating member to a certain extent while reducing the use cost of the first insulating member.

[0026] Optionally, the thickness of the first insulating member is 0.5 mm to 0.6 mm, so as to further ensure the insulation performance of the first insulating member to a certain extent and reduce the use cost of the first insulating member.

[0027] Optionally, the adapter further includes a second insulating member disposed between the first connecting end and the third connecting end, thereby providing an insulated fit between the first connecting end and the third connecting end, thereby preventing electrical connection between the first connecting end and the third connecting end, that is, preventing electrical connection between the first adapter portion and the second adapter portion, and thereby ensuring the operating performance and reliability of the battery cell.

[0028] Optionally, at least one of the first connection end and the third connection end is provided with a second positioning structure for positioning the second insulating member. Using the second positioning structure to position the second insulating member can improve the positional stability of the second insulating member, allowing the second insulating member to be stably positioned between the first connection end and the third connection end, thereby preventing the first connection end and the third connection end from forming an electrical connection, and also reducing the difficulty of positioning the second insulating member.

[0029] Optionally, the second positioning structure is a positioning hole, and a portion of the second insulating member is received in the second positioning structure. This allows the second positioning structure to be positioned and matched with the second insulating member, thereby facilitating positioning of the second insulating member using the second positioning structure, improving the positional stability of the second insulating member, and reducing the difficulty of positioning the second insulating member.

[0030] Optionally, the second insulating member is provided with a retaining groove open toward the first connecting end and / or the third connecting end, and at least a portion of the first connecting end and / or the third connecting end fits within the retaining groove. This increases the strength of the fit between the second insulating member and the first adapter portion and the second adapter portion, while also facilitating the use of the first adapter portion and the second adapter portion to define the position of the second insulating member. This, to a certain extent, prevents the second insulating member from shifting in the axial direction of the battery cell, improves the positional stability of the second insulating member, and thereby ensures improved performance of the second insulating member.

[0031] Optionally, the second insulating member is provided with a positioning hole directly opposite the center hole of the electrode assembly. This positioning hole not only serves to locate the adapter during installation, thereby reducing the difficulty of assembling the adapter, but also serves to vent air in the event of thermal runaway of the battery cell, thereby improving the reliability of the battery cell.

[0032] Optionally, the battery cell is a cylindrical battery, which ensures the working performance and reliability of the battery cell to a certain extent.

[0033] In a second aspect, the present application provides a battery pack comprising a plurality of battery cells as described in the above embodiments.

[0034] In the technical solution of the embodiment of the present application, the battery cells described in the above embodiment are adopted to realize the use of the adapter described in the above embodiment, thereby ensuring the working performance of the battery pack to a certain extent.

[0035] In a third aspect, the present application provides an electrical device, comprising the battery pack described in the above embodiment, wherein the battery pack is used to provide electrical energy.

[0036] In the technical solution of the embodiment of the present application, by adopting the battery pack described in the above embodiment, the working performance of the electrical device can be effectively guaranteed to a certain extent.

[0037] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] 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.

[0039] FIG1 is a schematic diagram of an electrical device according to some embodiments of the present application.

[0040] FIG2 is an exploded view of a battery pack according to some embodiments of the present application.

[0041] FIG3 is an exploded view of a battery cell according to some embodiments of the present application.

[0042] FIG. 4 is an exploded view of the connection between the end cap and the adapter according to some embodiments of the present application.

[0043] FIG. 5 is a schematic diagram of an adapter before being bent according to some embodiments of the present application.

[0044] FIG. 6 is an exploded view of an adapter before bending according to some embodiments of the present application.

[0045] FIG. 7 is a top view of the adapter before being bent according to some embodiments of the present application.

[0046] FIG8 is a cross-sectional view along line AA of FIG7 .

[0047] FIG. 9 is a schematic diagram of a bent adapter according to some embodiments of the present application.

[0048] FIG. 10 is an exploded view of the adapter after bending according to some embodiments of the present application.

[0049] Reference numerals:

[0050] 1000, electrical device; 100, adapter; 110, first adapter portion; 111, first connection end; 112, second connection end; 1121, first connection hole; 113, first middle portion; 1131, first protrusion; 1132, first receiving groove; 120, second adapter portion; 121, third connection end; 122, fourth connection end; 1221, second connection hole; 123, second middle portion; 1231, second protrusion; 130, first insulating member; 140, second insulating member; 141, positioning hole; 150, first positioning hole Structure; 160, second positioning structure; 500, battery cell; 510, outer shell; 511, first electrode terminal; 512, second electrode terminal; 513, accommodating cavity; 514, end cover; 5141, upper plastic; 5142, top cover sheet; 5143, lower plastic; 5144, first pole; 5145, second pole; 520, electrode assembly; 521, first pole ear; 522, second pole ear; 530, blue film; 200, controller; 300, motor; 400, battery pack; 410, box; 411, first box; 412, second box. DETAILED DESCRIPTION

[0051] 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.

[0052] 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.

[0053] 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. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] The term "plurality" used in this application refers to two or more (including two).

[0058] In this application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application do not limit this. Battery cells may be cylindrical, flat, rectangular, or other shapes, etc., and the embodiments of this application do not limit this. Battery cells are generally divided into three types based on the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, and the embodiments of this application do not limit this.

[0059] The battery referred to in the embodiments of this application refers to a single physical module that includes multiple battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may be a battery module or battery pack. A battery module generally includes multiple battery cells. A battery generally includes a casing for enclosing multiple battery cells or multiple battery modules. The casing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells. Of course, the battery may also not include a casing.

[0060] For example, a battery cell typically includes a housing, a cell assembly, and an electrolyte. The housing is used to house the cell assembly and electrolyte, and is provided with at least one positive electrode post and at least one negative electrode post. The cell assembly includes one or more electrode assemblies, which are formed by stacking or winding positive and negative electrode sheets and separators.

[0061] The positive electrode sheet generally includes a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is directly or indirectly coated on the positive electrode current collector, and multiple positive electrode tabs are stacked together and electrically connected to the positive electrode column. For example, the stacked multiple positive electrode tabs can be directly welded to the positive electrode column to form an electrical connection; alternatively, the battery cell assembly may further include a positive electrode adapter, the stacked multiple positive electrode tabs are welded to one end of the positive electrode adapter, and the other end of the positive electrode adapter is welded to the positive electrode column to form an electrical connection between the positive electrode tab and the positive electrode column.

[0062] The negative electrode sheet generally includes a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer being directly or indirectly coated on the negative electrode current collector. Multiple negative electrode tabs are stacked together and electrically connected to the negative electrode post. For example, the stacked multiple negative electrode tabs can be directly welded to the negative electrode post to form an electrical connection. Alternatively, the battery cell assembly may further include a negative electrode adapter. The stacked multiple negative electrode tabs are welded to one end of the negative electrode adapter, and the other end of the negative electrode adapter is welded to the negative electrode post to form an electrical connection between the negative electrode tab and the negative electrode post. The material of the separator is not limited, and may be, for example, polypropylene or polyethylene.

[0063] Currently, judging by market developments, batteries are increasingly being used. They are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace.

[0064] As the application areas of batteries continue to expand, the market demand is also increasing.

[0065] Among them, during the battery manufacturing process, in order to reduce the volume of the battery, increase the energy density of the battery or facilitate electrical connection between multiple batteries, the positive and negative electrode tabs of the battery are usually set on the same side, that is, the positive and negative electrodes of the battery are led out from the same side.

[0066] However, when the positive and negative electrodes of existing batteries are led out on the same side, the flow area of ​​the positive and negative current collecting plates is small, resulting in large resistance, making it impossible to achieve high-power flow, and affecting the battery's performance.

[0067] In order to solve the above problems, the embodiment of the present application provides a battery cell 500 that can meet the requirement of leading the positive and negative poles of the battery on the same side and has a sufficiently large flow area. The specific solution is to overlap at least part of the first adapter part 110 and the second adapter part 120 in the axial direction of the battery cell 500 to ensure the flow area of ​​the first adapter part 110 and the second adapter part 120 to a certain extent, thereby improving the flow capacity of the first adapter part 110 and the second adapter part 120, that is, improving the flow capacity of the adapter 100, so as to ensure the working performance of the battery cell 500 to a certain extent, and solve the technical problem of small flow area and poor flow capacity of the collecting plate when the positive and negative poles of the battery are led out on the same side in the prior art.

[0068] The embodiments of the present application provide an electric device using the battery disclosed herein 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. Among them, 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. The electric tool includes a metal cutting power tool, a grinding power tool, an assembly power tool, and a railway power tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, etc.

[0069] For the convenience of description, the following embodiments take the electric device 1000 as a vehicle as an example, and describe in detail the structures of the electric device 1000, the battery pack 400, and the battery cell 500 of the present application.

[0070] Please refer to Figure 1, which is a schematic structural diagram of a vehicle in which the power-consuming device 1000 provided in some embodiments of the present application is a vehicle. 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. The vehicle is provided with a battery pack 400, and the battery pack 400 can be arranged at the bottom, head or tail of the vehicle. The battery pack 400 can be used to power the vehicle, for example, the battery pack 400 can serve as an operating power source for the vehicle. The vehicle can also include a controller 200 and a motor 300, and the controller 200 is used to control the battery pack 400 to power the motor 300, for example, for starting, navigating and operating power requirements during driving of the vehicle.

[0071] In some embodiments of the present application, the battery pack 400 can serve not only as the operating power source of the vehicle, but also as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0072] Please refer to Figure 2, which is an exploded view of the structure of a battery cell 500 used in a battery pack 400 according to some embodiments of the present application. The battery pack 400 includes a housing 410 and a plurality of battery cells 500, with the battery cells 500 housed within the housing 410. The housing 410 is used to provide assembly space for the battery cells 500 and can adopt a variety of structures.

[0073] In some other embodiments of the present application, the battery pack 400 may not include the box body 410, but only include a plurality of battery cells 500, which will not be described in detail here.

[0074] In some embodiments, the housing 410 may include a first housing 411 and a second housing 412, wherein the first housing 411 and the second housing 412 cover each other, and the first housing 411 and the second housing 412 jointly define a housing cavity for accommodating battery cells. The second housing 412 may be a hollow structure with one end open, and the first housing 411 may be a plate-like structure, with the first housing 411 covering the open side of the second housing 412, so that the first housing 411 and the second housing 412 jointly define a housing cavity; alternatively, the first housing 411 and the second housing 412 may both be hollow structures with one end open (for example, as shown in FIG. 2 ), with the open side of the first housing 411 covering the open side of the second housing 412. Of course, the housing 410 formed by the first housing 411 and the second housing 412 may be of various shapes, such as a cylinder or a rectangular parallelepiped.

[0075] In the battery pack 400, multiple battery cells 500 can be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel connections within the multiple battery cells 500. Multiple battery cells 500 can be directly connected in series, in parallel, or in a hybrid configuration, and then the entire structure of the multiple battery cells 500 can be housed within the housing 410. Alternatively, the battery pack 400 can be constructed by first connecting multiple battery cells 500 in series, in parallel, or in a hybrid configuration to form a battery module. The multiple battery modules are then connected in series, in parallel, or in a hybrid configuration to form a single structure, which is then housed within the housing 410. The battery pack 400 may also include other structures, such as a busbar for electrically connecting the multiple battery cells 500.

[0076] Please refer to Figure 3, which is a schematic diagram of the structure of a battery cell 500 provided in some embodiments of the present application. The battery cell is cylindrical, and the axial direction of the battery cell is the axial direction of the electrode assembly. In other embodiments of the present application, the battery cell may also be a rectangular parallelepiped, a polygonal prism, a flat body, or other shapes.

[0077] The battery cell 500 according to an embodiment of the present application will be described below with reference to the accompanying drawings.

[0078] As shown in conjunction with FIG. 3 and FIG. 4 , the battery cell 500 of the embodiment of the present application includes: a housing 510 , an electrode assembly 520 and a adapter 100 .

[0079] As shown in FIG3 , the housing 510 is provided with a first electrode terminal 511 and a second electrode terminal 512 , and the electrode assembly 520 includes a first electrode tab 521 and a second electrode tab 522 , and the polarities of the first electrode tab 521 and the second electrode tab 522 are opposite.

[0080] In some embodiments, the first tab 521 is formed as a positive tab and the second tab 522 is formed as a negative tab; or the first tab 521 is formed as a negative tab and the second tab 522 is formed as a positive tab. This ensures that the polarities of the first tab 521 and the second tab 522 are opposite, thereby ensuring the operating performance of the battery cell 500 to a certain extent.

[0081] As shown in Figures 3, 4, and 5, the adapter 100 is disposed between the electrode assembly 520 and the housing 510 and includes a first adapter portion 110 and a second adapter portion 120. The first adapter portion 110 is electrically connected to the first electrode terminal 511 and the first electrode tab 521, respectively, and the second adapter portion 120 is electrically connected to the second electrode terminal 512 and the second electrode tab 522, respectively. At least portions of the first adapter portion 110 and the second adapter portion 120 overlap in the axial direction of the battery cell 500. This facilitates electrical connection between the electrode assembly 520 and the first and second electrode terminals 511, 512, allowing current to be drawn from the electrode assembly 520 using the first and second electrode terminals 511, 512, thereby ensuring the operating performance of the battery cell 500 to a certain extent.

[0082] At the same time, by arranging at least part of the first adapter part 110 and the second adapter part 120 to overlap in the axial direction of the battery cell 500, the area of ​​the first adapter part 110 and the second adapter part 120 can be guaranteed to a certain extent, thereby increasing the flow area of ​​the first adapter part 110 and the second adapter part 120, improving the flow capacity of the first adapter part 110 and the second adapter part 120, that is, improving the flow capacity of the adapter 100, achieving high-power flow, and improving the working performance of the battery cell 500.

[0083] As can be seen from the above structure, the battery cell 500 of the present application has at least part of the first adapter portion 110 and the second adapter portion 120 overlappingly arranged in the axial direction of the battery cell 500, so as to achieve the purpose of widening the first adapter portion 110 and the second adapter portion 120, thereby improving the current-carrying capacity of the first adapter portion 110 and the second adapter portion 120, achieving high-power current carrying, and improving the working performance of the battery cell 500.

[0084] It can be understood that compared with the prior art, the present application widens the first adapter part 110 and the second adapter part 120 to improve the flow capacity of the first adapter part 110 and the second adapter part 120, thereby improving the flow capacity of the adapter 100, ensuring the flow effect to a certain extent, and facilitating the realization of high-power flow.

[0085] In some embodiments, as shown in conjunction with FIG4 and FIG6 , the first adapter 110 includes a first connection end 111, a second connection end 112, and a first middle portion 113. The first connection end 111 is electrically connected to the first tab 521, the second connection end 112 is electrically connected to the first electrode terminal 511, and the first middle portion 113 is electrically connected to the first connection end 111 and the second connection end 112, respectively. This allows for electrical connection between the first tab 521 and the first electrode terminal 511 and reduces the difficulty of electrical connection between the first tab 521 and the first electrode terminal 511.

[0086] In some embodiments, the first adapter portion 110 is formed as a positive electrode adapter portion, and the first connection end 111 of the first adapter portion 110 is used to electrically connect to the first pole ear 521 of the battery cell 500, and the second connection end 112 of the first adapter portion 110 is used to electrically connect to the first electrode terminal 511 of the battery cell 500. In this way, after the first middle part 113 is electrically connected to the first connection end 111 and the second connection end 112 respectively, the electrical connection between the positive pole ear and the positive terminal can be achieved, which facilitates the use of the positive terminal to draw out the current of the battery cell 500 and reduces the difficulty of connecting the positive pole ear and the positive terminal of the battery cell 500.

[0087] In some embodiments, the first connection end 111, the second connection end 112 and the first middle part 113 are formed as an integral part. In this way, while achieving electrical connection between the first middle part 113 and the first connection end 111 and the second connection end 112, the difficulty of connecting the first middle part 113 and the first connection end 111 and the second connection end 112 can be reduced, and the connection quality can be guaranteed to a certain extent.

[0088] In some embodiments, as shown in conjunction with FIG4 and FIG6 , the second transition portion 120 includes a third connection end 121, a fourth connection end 122, and a second intermediate portion 123. The third connection end 121 is electrically connected to the second electrode tab 522, the fourth connection end 122 is electrically connected to the second electrode terminal 512, and the second intermediate portion 123 is electrically connected to the third connection end 121 and the fourth connection end 122, respectively. This allows for electrical connection between the second electrode tab 522 and the second electrode terminal 512 and reduces the difficulty of electrical connection between the second electrode tab 522 and the second electrode terminal 512.

[0089] In some embodiments, the second adapter portion 120 is formed as a negative electrode adapter portion, and the third connection end 121 of the second adapter portion 120 is used to electrically connect to the second pole ear 522 of the battery cell 500, and the fourth connection end 122 of the second adapter portion 120 is used to electrically connect to the second electrode terminal 512 of the battery cell 500. In this way, after the second middle part 123 is electrically connected to the third connection end 121 and the fourth connection end 122 respectively, the electrical connection between the negative pole ear and the negative terminal can be achieved, which facilitates the use of the negative terminal to draw out the current of the battery cell 500 and reduces the difficulty of connecting the negative pole ear of the battery cell 500 with the negative terminal.

[0090] In some embodiments, the third connection end 121, the fourth connection end 122 and the second middle part 123 are formed as an integral part. In this way, while the second middle part 123 is electrically connected to the third connection end 121 and the fourth connection end 122 respectively, the difficulty of connecting the second middle part 123 with the third connection end 121 and the fourth connection end 122 can be reduced, and the connection quality can be guaranteed to a certain extent.

[0091] It should be noted that the above description is mainly based on the example that the first adapter part 110 is formed as a positive electrode adapter part and the second adapter part 120 is formed as a negative electrode adapter part. In some other embodiments, the first adapter part 110 can be formed as a negative electrode adapter part and the second adapter part 120 can be formed as a positive electrode adapter part.

[0092] Among them, when the first adapter part 110 can be formed as a negative electrode adapter part, the first adapter part 110 is used to connect to the negative electrode ear and the negative terminal of the battery cell 500 respectively; when the second adapter part 120 is formed as a positive electrode adapter part, the second adapter part 120 is used to connect to the positive electrode ear and the positive terminal of the battery cell 500 respectively. This can also be used to realize the electrical connection between the negative electrode ear and the negative terminal of the battery cell 500 and the electrical connection between the positive electrode ear and the positive terminal of the battery cell 500, which is convenient for drawing out the current of the battery cell 500.

[0093] In some embodiments, the first adapter 110 is a copper adapter, and the second adapter 120 is an aluminum adapter. This allows the first adapter 110 and the second adapter 120 to cooperate to electrically connect the positive electrode of the electrode assembly 520 to the positive terminal of the housing 510, and to electrically connect the negative electrode of the electrode assembly 520 to the negative terminal of the housing 510, respectively, thereby ensuring the operating performance of the battery cell 500 to a certain extent.

[0094] In some embodiments, as shown in conjunction with Figures 5 and 6 , in a first direction, the first connection end 111 and the third connection end 121 are spaced apart, the second connection end 112 and the fourth connection end 122 are spaced apart, and the first intermediate portion 113 and the second intermediate portion 123 overlap in the axial direction of the battery cell 500, with the first direction intersecting the axial direction. The first direction referred to herein can be understood as the Y direction of the battery cell 500 shown in Figure 5 , i.e., the width direction of the adapter 100. By spacing the first connection end 111 and the third connection end 121 in the first direction, and spacing the second connection end 112 and the fourth connection end 122 in the first direction, electrical connection between the first adapter portion 110 and the second adapter portion 120 is avoided to a certain extent, thereby ensuring the reliability of the battery cell 500 to a certain extent.

[0095] It should be noted that the X direction shown in FIG. 5 can be understood as the length direction of the adapter 100 before being bent.

[0096] In some embodiments, as shown in conjunction with Figures 5 and 6 , first middle portion 113 includes a first protruding portion 1131, which protrudes from first connection end 111 toward second adapter portion 120; and / or second middle portion 123 includes a second protruding portion 1231, which protrudes from third connection end 121 toward first adapter portion 110. This means that the protruding portion may be provided on either first middle portion 113 or second middle portion 123, or on both first middle portion 113 and second middle portion 123.

[0097] Among them, when a protruding portion is set on the first middle part 113, the protruding portion is formed as a first protruding portion 1131, and the first protruding portion 1131 protrudes from the first connection end 111 toward the second adapter part 120, so as to ensure the protruding area of ​​the first protruding portion 1131 to a certain extent, thereby increasing the flow area of ​​the first middle part 113 and improving the flow capacity of the first adapter part 110; when a protruding portion is set on the second middle part 123, the protruding portion is formed as a second protruding portion 1231, and the second protruding portion 1231 protrudes from the third connection end 121 toward the first adapter part 110, so as to ensure the protruding area of ​​the second protruding portion 1231 to a certain extent, thereby increasing the flow area of ​​the second middle part 123 and improving the flow capacity of the second adapter part 120.

[0098] That is to say, the present application provides a first protruding portion 1131 on the first middle portion 113; and / or provides a second protruding portion 1231 on the second middle portion 123, thereby ensuring the flow area of ​​the adapter 100 to a certain extent, thereby improving the flow capacity of the adapter 100, achieving high-power flow, and improving the working performance of the battery cell 500.

[0099] In some embodiments, as shown in Figure 6, both the first middle portion 113 and the second middle portion 123 are provided with protruding portions, that is, the first middle portion 113 is provided with a first protruding portion 1131 protruding toward the second adapter portion 120 and protruding from the first connection end 111, and the second middle portion 123 is provided with a second protruding portion 1231 protruding toward the first adapter portion 110 and protruding from the third connection end 121, so as to achieve the simultaneous widening of the first middle portion 113 and the second middle portion 123, to ensure the flow area of ​​the first middle portion 113 and the second middle portion 123 to a certain extent, thereby improving the flow capacity of the first middle portion 113 and the second middle portion 123.

[0100] Optionally, the first protruding portion 1131 is integrally formed with the first middle portion 113. That is, the first protruding portion 1131 and the first middle portion 113 are formed as a single piece, which ensures the connection strength between the first protruding portion 1131 and the first middle portion 113 to a certain extent, improves the positional stability of the first protruding portion 1131, and thus ensures that the first protruding portion 1131 can effectively increase the flow area of ​​the first middle portion 113. At the same time, the connection step between the first protruding portion 1131 and the first middle portion 113 can be omitted, thereby reducing the difficulty of connecting the first protruding portion 1131 and the first middle portion 113.

[0101] Optionally, the second protruding portion 1231 is integrally formed with the second middle portion 123. The beneficial effects produced by the integral formation of the first protruding portion 1131 and the first middle portion 113 can be referred to as the beneficial effects produced by the integral formation of the first protruding portion 1131 and the first middle portion 113, which will not be described in detail here.

[0102] In some embodiments, as shown in Figures 5, 7, and 8, the first middle portion 113 and the second middle portion 123 are overlapped in the axial direction of the battery cell 500. The overlapping arrangement herein can be understood as the first connection end 111 and the third connection end 121, as well as the second connection end 112 and the fourth connection end 122, being spaced apart in the left-right direction, and the first protruding portion 1131 and the second protruding portion 1231 overlapping in the top-bottom direction. This can, to a certain extent, prevent the first protruding portion 1131 and the second protruding portion 1231 from interfering with each other during the protrusion process, thereby ensuring that the first protruding portion 1131 and the second protruding portion 1231 have a sufficiently large protruding area to a certain extent, while further improving the current flow capacity of the first adapter portion 110 and the second adapter portion 120.

[0103] In some embodiments, as shown in FIG. 6 , the first protruding portion 1131 and the second protruding portion 1231 protrude toward each other and overlap to ensure that the first protruding portion 1131 and the second protruding portion 1231 have a sufficiently large protruding area to a certain extent.

[0104] At the same time, by arranging the first protruding portion 1131 and the second protruding portion 1231 to protrude in a direction close to each other, it is possible to avoid, to a certain extent, increasing the occupied space of the adapter 100 and reduce the difficulty of assembling the adapter 100.

[0105] In some embodiments, the protruding length of the first protruding portion 1131 does not exceed the second middle portion 123, and the protruding length of the second protruding portion 1231 does not exceed the first middle portion 113. This ensures the flow area of ​​the first middle portion 123 and the second middle portion 113 to a certain extent, while also preventing the first protruding portion 1131 from extending beyond the second protruding portion 1231 and electrically connecting to the second adapter portion 120, the second electrode terminal 512, and / or the second tab 522, and also preventing the second protruding portion 1231 from extending beyond the first protruding portion 1131 and electrically connecting to the first adapter portion 110, the first electrode terminal 511, and / or the first tab 521, thereby ensuring the operating performance of the battery cell 500 to a certain extent.

[0106] In some embodiments, as shown in FIG. 3 and FIG. 7 , the width of the first middle portion 113 and / or the second middle portion 123 in the first direction is w, and the diameter of the battery cell 500 is D, where 3 mm ≤ w ≤ D −2 mm. That is to say, the width of the first middle part 113 and / or the second middle part 123 in the Y direction is w. The diameter D of the battery cell 500 mentioned here can be understood as the diameter of the shell 510. In some examples, when the shell 510 has a certain thickness, D refers to the maximum outer diameter of the shell 510. When the width w of the first middle part 113 and / or the second middle part 123 in the first direction is less than 3 mm, the flow area of ​​the first middle part 113 and / or the second middle part 123 will be reduced, affecting the flow capacity of the first middle part 113 and / or the second middle part 123; when the width w of the first middle part 113 and / or the second middle part 123 in the first direction is greater than D-2 mm, the manufacturing cost of the first middle part 113 and / or the second middle part 123 will increase. At the same time, there is a risk that the first middle part 113 and / or the second middle part 123 will extend beyond the shell 510 of the battery cell 500 and be electrically connected to other structural parts, thereby affecting the working performance of the battery cell 500.

[0107] Therefore, the present application sets the width w of the first middle part 113 and / or the second middle part 123 in the first direction to be greater than or equal to 3 mm or less than or equal to D-2 mm. In this way, while ensuring the area of ​​the first middle part 113 and the second middle part 123 to a certain extent, it can also reduce the use cost of the first middle part 113 and the second middle part 123, and to a certain extent avoid the first middle part 113 and the second middle part 123 from exceeding the outer shell 510 of the battery cell 500 and being electrically connected to other structural parts, so as to ensure the working performance of the battery cell 500 to a certain extent.

[0108] In some embodiments, 6 mm ≤ w ≤ D - 4 mm. This further reduces the cost of using the first and second middle portions 113, 123 while ensuring the area of ​​the first and second middle portions 113, 123 to a certain extent. Furthermore, it also prevents the first and second middle portions 113, 123 from extending beyond the battery cell 500 and being electrically connected to other structural components, thereby ensuring the operating performance of the battery cell 500 to a certain extent.

[0109] In some embodiments, in the Y direction of the battery cell 500, the first middle portion 113 and the second middle portion 123 are arranged close to the middle of the battery cell 500, so that the two side walls of the first middle portion 113 and the second middle portion 123 in the Y direction are spaced apart from the side walls of the battery cell 500, and the spacing is 2 mm, so that the width w of the first middle portion 113 and the second middle portion 123 in the first direction is w = D-4 mm, which to a certain extent ensures the area of ​​the first middle portion 113 and the second middle portion 123, and to a certain extent avoids the first middle portion 113 and the second middle portion 123 from extending to the outside of the battery cell 500.

[0110] In some embodiments, as shown in Figures 4, 9, and 10, the first adapter 110 is formed as a bent piece, and the first connection end 111, the first middle portion 113, and the second connection end 112 are stacked in a second direction, and the second direction intersects the first direction. In other words, the first adapter 110 of the present application is formed as a bent piece. When the first adapter 110 is formed as a bent piece, the first connection end 111, the first middle portion 113, and the second connection end 112 of the first adapter 110 are stacked in the second direction. The second direction mentioned here can be understood as the height direction of the first adapter 110, that is, the up-down direction shown in Figure 8, so that it is convenient to use the first adapter 110 to connect two structural members (such as the first tab 521 and the first electrode terminal 511) spaced apart in the second direction, thereby reducing the difficulty of connecting the first tab 521 and the first electrode terminal 511 spaced apart in the second direction.

[0111] At the same time, after the first transition portion 110 is bent, the length dimension of the first transition portion 110 can be reduced, thereby reducing the radial dimension of the battery cell 500 and reducing the difficulty of assembling the battery cell 500 .

[0112] Optionally, as shown in Figures 4, 9, and 10, the second adapter 120 is formed as a bent piece, and the third connection end 121, the second middle portion 123, and the fourth connection end 122 are stacked in the second direction. In other words, the second adapter 120 can also be formed as a bent piece. When the second adapter 120 is formed as a bent piece, the third connection end 121, the second middle portion 123, and the fourth connection end 122 of the second adapter 120 are stacked in the second direction, thereby facilitating the use of the second adapter 120 to connect two structural members (such as the second electrode tab 522 and the second electrode terminal 512) spaced apart in the second direction, thereby reducing the difficulty of connecting the second electrode tab 522 and the second electrode terminal 512 spaced apart in the second direction.

[0113] In summary, the adapter 100 of the present application is formed as a bent piece.

[0114] It should be noted that the battery cell 500 of the present application may be cylindrical, flat, rectangular or other shapes, and the embodiments of the present application are not limited to this. For ease of explanation, a cylindrical battery is used as an example in the following embodiments.

[0115] In some embodiments, as shown in FIG3 , the battery cell 500 is a cylindrical battery, which ensures the working performance and reliability of the battery cell to a certain extent.

[0116] In some embodiments, as shown in Figure 3, a accommodating cavity 513 is formed in the outer shell 510, and the electrode assembly 520 is arranged in the accommodating cavity 513, so that the electrode assembly 520 is arranged in the outer shell 510, which makes it convenient to use the outer shell 510 to protect the electrode assembly 520, improve the reliability of the electrode assembly 520, and extend the service life of the electrode assembly 520. At the same time, the outer shell 510 can also be used to support the electrode assembly 520, to ensure the position stability of the electrode assembly 520 to a certain extent, which is conducive to ensuring the working performance of the electrode assembly 520 to a certain extent.

[0117] In some embodiments, one end of the accommodating cavity 513 is open, so that the electrode assembly 520 can be placed in the accommodating cavity 513 using the opening, thereby facilitating the use of the outer shell 510 to support and protect the electrode assembly 520 .

[0118] In some embodiments, as shown in Figures 3 and 4, the outer shell 510 includes an end cover 514, which is arranged at the opening of the accommodating cavity 513 to achieve a closed opening, thereby preventing external foreign matter from entering the accommodating cavity 513 through the opening to a certain extent, thereby achieving the purpose of using the outer shell 510 to protect the electrode assembly 520.

[0119] Optionally, as shown in Figures 3 and 4, the first electrode terminal 511 and the second electrode terminal 512 are arranged on the end cover 514. While realizing that the first electrode terminal 511 and the second electrode terminal 512 are arranged on the outer shell 510, the difficulty of setting the first electrode terminal 511 and the second electrode terminal 512 can also be reduced, thereby facilitating the electrical connection between the first electrode terminal 511 and the first electrode tab 521 and the electrical connection between the second electrode terminal 512 and the second electrode tab 522, thereby ensuring the working performance of the battery cell 500 to a certain extent.

[0120] In some embodiments, in combination with Figures 3, 4 and 6, a first connection hole 1121 is provided on the second connection end 112 of the first adapter portion 110, a second connection hole 1221 is provided on the fourth connection end 122 of the second adapter portion 120, and a first pole 5144 and a second pole 5145 are provided on the end cover 514. The first pole 5144 is used to pass through the first connection hole 1121 to electrically connect with the first electrode terminal 511, thereby realizing the electrical connection between the second connection end 112 and the first electrode terminal 511, and the second pole 5145 is used to pass through the second connection hole 1221 to electrically connect with the second electrode terminal 512, thereby realizing the electrical connection between the fourth connection end 122 and the second electrode terminal 512.

[0121] Optionally, in combination with Figures 3 and 4, the end cover 514 further includes a lower plastic 5143 and a top cover piece 5142, and the lower plastic 5143 and the top cover piece 5142 are cooperatively connected. The first pole 5144 is used to pass through the lower plastic 5143 and the top cover piece 5142 respectively to be electrically connected to the first electrode terminal 511, and the second pole 5145 is used to pass through the lower plastic 5143 and the top cover piece 5142 respectively to be electrically connected to the second electrode terminal 512. In this way, while achieving electrical connection between the first pole 5144 and the first electrode terminal 511 and the second pole 5145 and the second electrode terminal 512, the lower plastic 5143 and the top cover piece 5142 can also be used to cooperate to support the first pole 5144 and the second pole 5145, so as to improve the positional stability of the first pole 5144 and the second pole 5145, thereby facilitating to ensure the connection quality of the first pole 5144 and the second pole 5145 to a certain extent.

[0122] Optionally, in combination with Figures 3 and 4, the end cover 514 also includes an upper plastic 5141, and at least a portion of the upper plastic 5141 is arranged between the first electrode terminal 511 and the second electrode terminal 512 to achieve insulation matching between the first electrode terminal 511 and the second electrode terminal 512, to a certain extent avoid electrical connection between the first electrode terminal 511 and the second electrode terminal 512, and to a certain extent ensure the reliability of the battery cell 500.

[0123] In some embodiments, as shown in Figure 3, the battery cell 500 also includes a blue film 530, which is arranged in the accommodating cavity 513 and located on the periphery of the electrode assembly 520, providing a stable and reliable space for the electrode assembly 520 to ensure the working performance of the electrode assembly 520 to a certain extent, that is, to ensure the working performance of the battery cell 500 to a certain extent.

[0124] In some embodiments, as shown in conjunction with Figures 6, 7, and 8, the adapter 100 further includes a first insulating member 130. In the overlapping direction, the first insulating member 130 is located at least between the first middle portion 113 and the second middle portion 123. This means that in the overlapping direction of the first protruding portion 1131 and the second protruding portion 1231, that is, in the vertical direction of the battery cell 500, the first insulating member 130 is located at least between the first middle portion 113 and the second middle portion 123, so that the first middle portion 113 and the second middle portion 123 form an insulating fit, to a certain extent preventing the first middle portion 113 and the second middle portion 123 from forming an electrical connection, thereby to a certain extent preventing the first adapter portion 110 and the second adapter portion 120 from forming an electrical connection, thereby ensuring the operating performance and reliability of the battery cell 500 to a certain extent.

[0125] It should be noted that the overlapping direction mentioned here can also be understood as the height direction of the adapter 100, that is, the up and down direction shown in Figure 8, that is, the first middle part 113 and the second middle part 123 overlap in height, and are separated and insulated in the middle by the first insulating part 130.

[0126] In some embodiments, the first insulating member 130 is formed as a rubber member, which is located between the first middle portion 113 and the second middle portion 123 to achieve insulating matching of the first middle portion 113 and the second middle portion 123 and to ensure the insulating effect of the first insulating member 130 to a certain extent.

[0127] In some embodiments, as shown in FIG6 , at least one of the first middle portion 113 and the second middle portion 123 is provided with a first positioning structure 150 for positioning the first insulating member 130. In other words, the first positioning structure 150 is provided on the first middle portion 113 and / or the second middle portion 123. The first positioning structure 150 is used to position the first insulating member 130, thereby improving the positional stability of the first insulating member 130 and allowing the first insulating member 130 to be stably positioned between the first protruding portion 1131 and the second protruding portion 1231. This, to a certain extent, prevents the first protruding portion 1131 and the second protruding portion 1231 from forming an electrical connection, thereby improving the operating performance of the battery cell 500.

[0128] At the same time, the first positioning structure 150 is used to position the first insulating member 130 , which can also reduce the difficulty of positioning the first insulating member 130 .

[0129] In some embodiments, as shown in FIG6 , first positioning structures 150 are provided on both first middle portion 113 and second middle portion 123. Using first positioning structures 150 on first middle portion 113 and first positioning structures 150 on second middle portion 123 simultaneously to position first insulating member 130 improves positioning quality, allowing first insulating member 130 to be stably positioned between first protruding portion 1131 and second protruding portion 1231.

[0130] In addition, when the first positioning structure 150 is provided on both the first middle part 113 and the second middle part 123, the first insulating part 130 can also be used to limit the position of the first adapter part 110 and the second adapter part 120, thereby avoiding relative displacement between the first adapter part 110 and the second adapter part 120 to a certain extent, thereby ensuring the structural stability and working performance of the adapter 100 to a certain extent.

[0131] In some embodiments, as shown in FIG6 , the first positioning structure 150 is a positioning hole, and a portion of the first insulating member 130 is received in the first positioning structure 150. This allows the first positioning structure 150 to be positioned and matched with the first insulating member 130, thereby facilitating positioning of the first insulating member 130 using the first positioning structure 150 and improving the positional stability of the first insulating member 130.

[0132] At the same time, by configuring the first positioning structure 150 as a positioning hole, the difficulty of matching the first positioning structure 150 with the first insulating member 130 can be reduced, thereby reducing the difficulty of positioning the first insulating member 130 .

[0133] In some embodiments, as shown in FIG6 , a plurality of positioning holes are provided on the first middle portion 113 and the second middle portion 123 , and the plurality of positioning holes cooperate to position the first insulating member 130 to maximize the position stability of the first insulating member 130 to a certain extent.

[0134] In some embodiments, a positioning protrusion is provided on the first insulating member 130 , and the positioning protrusion can be positioned and matched in the positioning hole to achieve positioning and matching between the first positioning structure 150 and the first insulating member 130 , thereby facilitating positioning of the first insulating member 130 using the first positioning structure 150 .

[0135] In some embodiments, as shown in conjunction with Figures 6, 7, and 8, the first intermediate portion 113 is provided with a first receiving groove 1132 for accommodating the first insulating member 130; and / or the second intermediate portion 123 is provided with a second receiving groove for accommodating the first insulating member 130. This means that the receiving groove for accommodating the first insulating member 130 can be provided on either the first intermediate portion 113 or the second intermediate portion 123, or can be provided on both the first intermediate portion 113 and the second intermediate portion 123. This facilitates positioning the first insulating member 130 between the first intermediate portion 113 and the second intermediate portion 123, and further between the first protruding portion 1131 and the second protruding portion 1231. This ensures insulation fit between the first protruding portion 1131 and the second protruding portion 1231 while also reducing the difficulty of assembling the first insulating member 130.

[0136] In some embodiments, as shown in conjunction with Figures 6, 7, and 8, the first middle portion 113 is provided with a first receiving groove 1132 for receiving the first insulating member 130. This means that the receiving groove is provided only on the first middle portion 113. This facilitates the placement of the first insulating member 130 between the first protruding portion 1131 and the second protruding portion 1231 while also avoiding the need to provide the receiving groove on the second middle portion 123 to a certain extent, thereby reducing the difficulty of molding the second middle portion 123.

[0137] Of course, in some other embodiments, the receiving groove may be provided only on the second middle portion 123. In this way, while facilitating the placement of the first insulating member 130 between the first protruding portion 1131 and the second protruding portion 1231, it is also possible to avoid providing the receiving groove on the first middle portion 113 to a certain extent, thereby reducing the difficulty of molding the first middle portion 113.

[0138] In some embodiments, a portion of the first adapter portion 110 is deformed to define the first receiving groove 1132. This means that when the receiving groove is provided on the first middle portion 113, a portion of the first adapter portion 110 is deformed to define the first receiving groove 1132, thereby reducing the difficulty of forming the first receiving groove 1132 and facilitating the placement of the first insulating member 130 between the first protruding portion 1131 and the second protruding portion 1231 to achieve insulating fit between the first protruding portion 1131 and the second protruding portion 1231.

[0139] It should be noted that the deformation of a portion of the first adapter portion 110 mentioned here can be bending a portion of the first adapter portion 110 to define the first accommodating groove 1132; or, digging a groove on one side surface of the first adapter portion 110 to define the first accommodating groove 1132.

[0140] In some embodiments, as shown in Figures 6, 7 and 8, a portion of the first adapter portion 110 is bent to define a first accommodating groove 1132. In this way, while forming the first accommodating groove 1132, the structural strength of the first adapter portion 110 can be guaranteed to a certain extent, thereby ensuring the working performance of the first adapter portion 110 to a certain extent and extending the service life of the first adapter portion 110.

[0141] In some embodiments, a portion of the second transition portion 120 is deformed to define the second receiving groove. That is, when the receiving groove is provided on the second middle portion 123, a portion of the second transition portion 120 is deformed to define the second receiving groove, thereby reducing the difficulty of forming the second receiving groove.

[0142] The deformation of a portion of the second adapter portion 120 mentioned here may be bending a portion of the second adapter portion 120 to define the second receiving groove; or digging a groove on a side surface of the second adapter portion 120 to define the second receiving groove.

[0143] In some embodiments, the first middle portion 113 protrudes in a direction away from the second middle portion 123 to form a first receiving groove 1132 between the first middle portion 113 and the second middle portion 123 for accommodating the first insulating member 130. In other words, by directly providing the first receiving groove 1132 for accommodating the first insulating member 130 on the first middle portion 113, the first insulating member 130 can be effectively positioned between the first middle portion 113 and the second middle portion 123. This also avoids, to a certain extent, the need for a groove in the second middle portion 123, thereby reducing the difficulty of forming the receiving groove and, consequently, easing the difficulty of assembling the first insulating member 130.

[0144] In some embodiments, the depth of the first receiving groove 1132 is greater than the thickness of the first insulating member 130. This ensures that the first insulating member 130 can be effectively disposed within the first receiving groove 1132, thereby facilitating the placement of the first insulating member 130 between the first middle portion 113 and the second middle portion 123. Furthermore, the first receiving groove 1132 is used to secure the first insulating member 130, thereby improving the positional stability of the first insulating member 130.

[0145] In some embodiments, the depth of the first receiving groove 1132 is equal to the thickness of the first insulating member 130. This allows the first insulating member 130 to be effectively disposed within the first receiving groove 1132 while also allowing the second middle portion 123 to directly cover the first receiving groove 1132 during assembly. This, to a certain extent, avoids the need to provide a groove on the second middle portion 123 to avoid the first insulating member 130 or a mating protrusion on the second middle portion 123 to fit within the first receiving groove 1132. This reduces the difficulty of molding the second middle portion 123 and ensures the surface flatness of the second middle portion 123 to a certain extent.

[0146] In some embodiments, the thickness of the first insulating member 130 is 0.3 mm to 0.7 mm. The thickness of the first insulating member 130 mentioned here can be understood as T shown in FIG8 . When the thickness of the first insulating member 130 is less than 0.3 mm, the insulation performance of the first insulating member 130 is reduced. When the thickness of the first insulating member 130 is greater than 0.7 mm, the manufacturing cost of the first insulating member 130 is increased, and the axial height of the battery cell 500 is increased, thereby increasing the occupied area of ​​the battery cell 500.

[0147] Therefore, the present application sets the thickness of the first insulating member 130 to 0.3mm~0.7mm, which can improve the insulation performance of the first insulating member 130 while reducing the manufacturing cost of the first insulating member 130, reducing the height of the battery cell 500, and reducing the difficulty of assembling the battery cell 500.

[0148] In some embodiments, the thickness of the first insulating member 130 is 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, or 0.7 mm.

[0149] In some embodiments, the thickness of the first insulating member 130 is 0.5 mm to 0.6 mm, so as to further improve the insulation performance of the first insulating member 130 , reduce the manufacturing cost of the first insulating member 130 , and reduce the height of the battery cell 500 .

[0150] In some embodiments, as shown in Figures 5, 6, and 7, the adapter 100 further includes a second insulating member 140, which is disposed between the first connection end 111 and the third connection end 121. This ensures that the first connection end 111 and the third connection end 121 form an insulated fit, thereby preventing electrical connection between the first connection end 111 and the third connection end 121 to a certain extent, and further preventing electrical connection between the first adapter portion 110 and the second adapter portion 120 to a certain extent, thereby ensuring the operating performance and reliability of the battery cell 500 to a certain extent.

[0151] In some embodiments, the second insulating member 140 is formed as a rubber member, which is arranged between the first connection end 111 and the third connection end 121 to achieve insulation matching between the first connection end 111 and the third connection end 121 and ensure the insulation effect of the second insulating member 140 to a certain extent.

[0152] In some embodiments, as shown in FIG6 , at least one of the first connection end 111 and the third connection end 121 is provided with a second positioning structure 160 for positioning the second insulating member 140. In other words, the first connection end 111 and / or the third connection end 121 is provided with the second positioning structure 160, and the second positioning structure 160 is used to position the second insulating member 140 to improve the positional stability of the second insulating member 140, so that the second insulating member 140 can be stably disposed between the first connection end 111 and the third connection end 121, thereby avoiding, to a certain extent, the formation of an electrical connection between the first connection end 111 and the third connection end 121, thereby improving the operating performance of the battery cell 500.

[0153] At the same time, the second positioning structure 160 is used to position the second insulating member 140 , which can also reduce the difficulty of positioning the second insulating member 140 .

[0154] In some embodiments, as shown in FIG6 , second positioning structures 160 are provided on both the first connection end 111 and the third connection end 121. Simultaneously utilizing the second positioning structures 160 on the first connection end 111 and the second positioning structures 160 on the third connection end 121 to position the second insulating member 140 improves positioning quality, allowing the second insulating member 140 to be stably positioned between the first connection end 111 and the third connection end 121.

[0155] In addition, when a second positioning structure 160 is provided on both the first connection end 111 and the third connection end 121, the first connection end 111 and the third connection end 121 can also be used to cooperate to support the second insulating member 140, thereby improving the position stability of the second insulating member 140 and ensuring that the first connection end 111 and the third connection end 121 can be insulated by the second insulating member 140. The second insulating member 140 can also be used to limit the position of the first adapter portion 110 and the second adapter portion 120, thereby avoiding relative displacement between the first adapter portion 110 and the second adapter portion 120 to a certain extent, thereby ensuring the structural stability and working performance of the adapter 100 to a certain extent.

[0156] In some embodiments, as shown in FIG6 , the second positioning structure 160 is a positioning hole, and a portion of the second insulating member 140 is received in the second positioning structure 160. This allows the second positioning structure 160 to be positioned and matched with the second insulating member 140, thereby facilitating positioning of the second insulating member 140 using the second positioning structure 160 and improving the positional stability of the second insulating member 140.

[0157] At the same time, by configuring the second positioning structure 160 as a positioning hole, the difficulty of matching the second positioning structure 160 with the second insulating member 140 can be reduced, thereby reducing the difficulty of positioning the second insulating member 140 .

[0158] In some embodiments, as shown in FIG6 , a plurality of positioning holes are provided on the first connection end 111 and the third connection end 121 , and the plurality of positioning holes cooperate to position the second insulating member 140 to maximize the position stability of the second insulating member 140 to a certain extent.

[0159] In some embodiments, a positioning protrusion is provided on the second insulating member 140 , and the positioning protrusion can be positioned and matched in the positioning hole to achieve positioning and matching between the second positioning structure 160 and the second insulating member 140 , thereby facilitating positioning of the second insulating member 140 using the second positioning structure 160 .

[0160] It should be noted that the cooperation between the positioning protrusion and the positioning hole is mainly used to prevent the second insulating member 140 from shifting in the X and Y directions of the battery cell 500 to a certain extent, that is, to prevent the second insulating member 140 from moving radially along the battery cell 500 to a certain extent.

[0161] In some embodiments, the second insulating member 140 is provided with a retaining groove that is open toward the first connecting end 111 and / or the third connecting end 121, and at least a portion of the first connecting end 111 and / or the third connecting end 121 fits within the retaining groove. This increases the strength of the fit between the second insulating member 140 and the first adapter portion 110 and the second adapter portion 120, and facilitates the use of the first adapter portion 110 and the second adapter portion 120 to define the position of the second insulating member 140. This prevents the second insulating member 140 from changing its position in the axial direction of the battery cell 500 to a certain extent, improves the positional stability of the second insulating member 140, and thereby ensures improved performance of the second insulating member 140 to a certain extent.

[0162] That is to say, by providing the limiting groove, the second insulating member 140 is mainly prevented from positionally shifting along the axial direction of the battery cell 500 to a certain extent, thereby ensuring the position stability of the second insulating member 140 to a certain extent and improving the insulation effect of the second insulating member 140.

[0163] In some embodiments, as shown in Figures 5 and 7 , the second insulating member 140 is provided with a positioning hole 141 that faces the center hole of the electrode assembly 520. This positioning hole 141 not only cooperates with the center hole of the electrode assembly 520 to position the adapter 100 during installation, thereby reducing the difficulty of assembling the adapter 100, but also serves to vent air in the event of thermal runaway of the battery cell 500, thereby improving the reliability of the battery cell 500.

[0164] The battery cell 500 of the present application is described in detail below with reference to the accompanying drawings. The battery cell 500 is a cylindrical battery.

[0165] As shown in FIG. 3 and FIG. 4 , the battery cell 500 includes a housing 510 , an electrode assembly 520 and an adapter 100 .

[0166] As shown in Figure 3, a accommodating cavity 513 is formed in the outer shell 510, and the electrode assembly 520 is arranged in the accommodating cavity 513. The electrode assembly 520 includes a first pole ear 521 and a second pole ear 522. The polarities of the first pole ear 521 and the second pole ear 522 are opposite. The blue film 530 is arranged in the accommodating cavity 513 and is located on the outer periphery of the electrode assembly 520. The outer shell 510 includes an end cover 514, and the end cover 514 is arranged at the opening of the accommodating cavity 513.

[0167] As shown in Figures 3 and 4, the end cover 514 also includes an upper plastic 5141, a lower plastic 5143, a top cover sheet 5142, a first pole 5144 and a second pole 5145. The first pole 5144 and the second pole 5145 are positive and negative poles. The lower plastic 5143 and the top cover sheet 5142 are cooperatively connected. The upper plastic 5141 is provided on a side of the top cover sheet 5142 away from the lower plastic 5143. The upper plastic 5141 is provided with a first electrode terminal 511 and a second electrode terminal 512. The first electrode terminal 511 and the second electrode terminal 512 are copper-aluminum riveted blocks. The first pole 5144 passes through the lower plastic 5143 and the top cover sheet 5142 respectively to be electrically connected to the first electrode terminal 511, and the second pole 5145 passes through the lower plastic 5143 and the top cover sheet 5142 respectively to be electrically connected to the second electrode terminal 512.

[0168] 3 , 4 , 5 and 6 , the adapter 100 is disposed between the electrode assembly 520 and the housing 510 and includes a first adapter portion 110 , a second adapter portion 120 , a first insulating member 130 and a second insulating member 140 .

[0169] As shown in Figures 6, 9 and 10, the first adapter 110 is a copper adapter, which includes a first connection end 111, a second connection end 112 and a first middle part 113. The first adapter 110 is formed as a bending part so that the first connection end 111, the first middle part 113 and the second connection end 112 are stacked in the upper and lower directions of the battery cell 500. The first connection end 111 is electrically connected to the first pole ear 521, and a first connection hole 1121 is provided on the second connection end 112. The first pole 5144 passes through the first connection hole 1121 and is electrically connected to the second connection end 112 to realize the electrical connection between the second connection end 112 and the first electrode terminal 511. The first middle part 113 is electrically connected to the first connection end 111 and the second connection end 112 respectively.

[0170] As shown in Figures 6, 9 and 10, the second adapter 120 is an aluminum adapter, and the second adapter 120 includes a third connection end 121, a fourth connection end 122 and a second middle portion 123, so that the third connection end 121, the second middle portion 123 and the fourth connection end 122 are stacked in the upper and lower directions of the battery cell 500, the third connection end 121 is electrically connected to the second pole ear 522, and a second connection hole 1221 is provided on the fourth connection end 122. The second pole 5145 passes through the second connection hole 1221 and is electrically connected to the fourth connection end 122 to realize the electrical connection between the fourth connection end 122 and the second electrode terminal 512. The second middle portion 123 is electrically connected to the third connection end 121 and the fourth connection end 122 respectively, thereby realizing the electrical connection between the first electrode terminal 511 and the first pole ear 521 and realizing the electrical connection between the second electrode terminal 512 and the second pole ear 522.

[0171] As shown in Figures 5 and 6, in the Y direction of the battery cell 500, the first connection end 111 and the third connection end 121 are spaced apart, and the second connection end 112 and the fourth connection end 122 are spaced apart. The first middle portion 113 includes a first protruding portion 1131, which protrudes from the first connection end 111 toward the second adapter 120, and the protruding length of the first protruding portion 1131 does not exceed the second middle portion 123. The second middle portion 123 includes a second protruding portion 1231, which protrudes from the third connection end 121 toward the first adapter 110, and the protruding length of the second protruding portion 1231 does not exceed the first middle portion 113. The first middle portion 113 and the second middle portion 123 are overlapped in the axial direction of the battery cell 500 to widen the middle portions of the first adapter 110 and the second adapter 120.

[0172] The width of the first middle portion 113 and the second middle portion 123 in the Y direction is w=D−4 mm, where D is the diameter of the battery cell 500 .

[0173] As shown in Figures 6, 7 and 8, the first middle portion 113 protrudes in a direction away from the second middle portion 123, so that the first middle portion 113 and the second middle portion 123 are offset in the height direction of the battery cell 500, thereby facilitating the formation of a first accommodating groove 1132 for accommodating the first insulating member 130 between the first middle portion 113 and the second middle portion 123. The thickness of the first insulating member 130 is 0.5 mm, and the groove depth of the first accommodating groove 1132 is equal to the thickness of the first insulating member 130. The first insulating member 130 is arranged in the first accommodating groove 1132 to achieve the first insulating member 130 being arranged between the first middle portion 113 and the second middle portion 123, so that the first middle portion 113 and the second middle portion 123 can be separated by the first insulating member 130. Positioning holes for positioning the first insulating member 130 are provided in the middle and upper parts of the first middle portion 113 and the second middle portion 123, and a portion of the first insulating member 130 is accommodated in the positioning holes.

[0174] 5 , 6 and 7 , the second insulating member 140 is disposed between the first connecting end 111 and the third connecting end 121. The second insulating member 140 is provided with a positioning hole 141 facing the center hole of the electrode assembly 520. The second insulating member 140 is provided with limiting grooves open toward the first connecting end 111 and the third connecting end 121 at both ends in the Y direction. At least portions of the first connecting end 111 and the third connecting end 121 are fitted in the limiting grooves. Positioning holes for positioning the second insulating member 140 are provided on both the first connecting end 111 and the third connecting end 121, and a portion of the second insulating member 140 is accommodated in the positioning holes.

[0175] The battery pack 400 of the second embodiment of the present application will be described below with reference to the accompanying drawings.

[0176] As shown in FIG. 2 , the battery pack 400 according to the embodiment of the present application includes a plurality of battery cells 500 according to the above-mentioned embodiments.

[0177] Since the battery cell 500 of the embodiment of the present application has the above technical effects, the battery pack 400 of the embodiment of the present application also has the above technical effects, that is, by adopting the battery cell 500 of the present application, the working performance of the battery pack 400 can be effectively guaranteed to a certain extent.

[0178] It should be noted that, in the battery pack 400 , the multiple battery cells 500 may be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 500 are connected in both series and in parallel.

[0179] The following describes the electrical device 1000 of the third embodiment of the present application with reference to the accompanying drawings.

[0180] As shown in FIG. 1 , the electric device 1000 according to the embodiment of the present application includes the battery pack 400 according to the above embodiment.

[0181] Since the battery pack 400 of the embodiment of the present application has the above technical effects, the electrical device 1000 of the embodiment of the present application also has the above technical effects, that is, by adopting the battery pack 400 of the present application, the working performance of the electrical device 1000 can be effectively guaranteed to a certain extent.

[0182] It is understandable that other structures and operations of the battery cell 500 , the battery pack 400 and the electric device 1000 according to the embodiment of the present application are well known to those skilled in the art and will not be described in detail here.

[0183] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0184] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. 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, wherein the housing is provided with a first electrode terminal and a second electrode terminal; An electrode assembly, the electrode assembly comprising a first electrode tab and a second electrode tab of opposite polarities; An adapter, which is arranged between the electrode assembly and the shell and includes a first adapter portion and a second adapter portion, the first adapter portion is electrically connected to the first electrode terminal and the first pole tab respectively, the second adapter portion is electrically connected to the second electrode terminal and the second pole tab respectively, and at least parts of the first adapter portion and the second adapter portion are overlapped in the axial direction of the battery cell.

2. The battery cell according to claim 1, wherein: The first transfer portion includes a first connection end, a second connection end and a first middle portion, the first connection end is electrically connected to the first electrode tab, the second connection end is electrically connected to the first electrode terminal, and the first middle portion is electrically connected to the first connection end and the second connection end respectively; A second transition portion, the second transition portion includes a third connection end, a fourth connection end and a second middle portion, the third connection end is electrically connected to the second electrode tab, the fourth connection end is electrically connected to the second electrode terminal, and the second middle portion is electrically connected to the third connection end and the fourth connection end, respectively; in a first direction, the first connection end and the third connection end are spaced apart, the second connection end and the fourth connection end are spaced apart, the first middle portion and the second middle portion are overlapped in the axial direction of the battery cell, and the first direction intersects with the axial direction.

3. The battery cell according to claim 2, wherein: The first middle portion includes a first protruding portion, and the first protruding portion protrudes from the first connecting end toward the second transition portion; And / or, the second middle portion includes a second protruding portion, and the second protruding portion protrudes from the third connecting end toward the first transition portion.

4. The battery cell according to claim 3, wherein: The protruding length of the first protruding portion does not exceed that of the second middle portion, and the protruding length of the second protruding portion does not exceed that of the first middle portion.

5. The battery cell according to any one of claims 2 to 4, wherein: The width of the first middle portion and / or the second middle portion in the first direction is w, and the diameter of the battery cell is D, wherein 3 mm ≤ w ≤ D-2 mm.

6. The battery cell according to claim 5, wherein: 6mm≤w≤D-4mm.

7. The battery cell according to any one of claims 2 to 6, wherein: The first transition portion is formed as a bent piece, the first connecting end, the first middle portion and the second connecting end are stacked in a second direction, and the second direction intersects the first direction; The second transition portion is formed as a bent piece, and the third connection end, the second middle portion and the fourth connection end are stacked in the second direction.

8. The battery cell according to any one of claims 2 to 7, wherein: The first transfer portion is a copper transfer portion; The second transition portion is an aluminum transition portion.

9. The battery cell according to any one of claims 2 to 8, wherein: A first insulating member is further included. In the overlapping direction, the first insulating member is at least located between the first middle portion and the second middle portion.

10. The battery cell according to claim 9, wherein: At least one of the first middle portion and the second middle portion is provided with a first positioning structure for positioning the first insulating member.

11. The battery cell according to claim 10, wherein: The first positioning structure is a positioning hole, and a portion of the first insulating member is accommodated in the first positioning structure.

12. The battery cell according to any one of claims 9 to 11, wherein: The first middle portion is provided with a first receiving groove for receiving the first insulating member; And / or, the second middle portion is provided with a second accommodating groove for accommodating the first insulating member.

13. The battery cell according to claim 12, wherein: A portion of the first transition portion is deformed to define the first receiving groove; And / or, a portion of the second transition portion is deformed to define a second accommodating groove.

14. The battery cell according to any one of claims 9 to 11, wherein: The first middle portion protrudes in a direction away from the second middle portion to form a first receiving groove for receiving the first insulating member between the first middle portion and the second middle portion.

15. The battery cell according to claim 14, wherein: A groove depth of the first accommodating groove is greater than a thickness of the first insulating member.

16. The battery cell according to claim 14 or 15, wherein: The groove depth of the first accommodating groove is equal to the thickness of the first insulating member.

17. The battery cell according to any one of claims 9 to 16, wherein: The thickness of the first insulating member is 0.3 mm to 0.7 mm.

18. The battery cell according to any one of claims 9 to 17, wherein: The thickness of the first insulating member is 0.5 mm to 0.6 mm.

19. The battery cell according to any one of claims 2 to 18, wherein: The device further includes a second insulating member, wherein the second insulating member is disposed between the first connecting end and the third connecting end.

20. The battery cell according to claim 19, wherein: At least one of the first connection end and the third connection end is provided with a second positioning structure for positioning the second insulating member.

21. The battery cell according to claim 20, wherein: The second positioning structure is a positioning hole, and a portion of the second insulating member is accommodated in the second positioning structure.

22. The battery cell according to any one of claims 19 to 21, wherein: The second insulating member is provided with a limiting groove which is open toward the first connecting end and / or the third connecting end, and at least a portion of the first connecting end and / or the third connecting end fits in the limiting groove.

23. The battery cell according to any one of claims 19 to 22, wherein: The second insulating member is provided with a positioning hole facing the central hole of the electrode assembly.

24. The battery cell according to any one of claims 1 to 23, wherein: The battery cell is a cylindrical battery.

25. A battery pack, wherein: The invention comprises a plurality of battery cells according to any one of claims 1 to 24.

26. An electrical device, wherein: Comprising a battery pack according to claim 25, the battery pack is used to provide electrical energy.

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