Battery cell, battery and electric device

Abstract

The embodiment of the utility model provides a battery monomer, a battery and a power utilization device. The battery cell includes a housing, a first electrode terminal, an electrode assembly, and a first insulating member. The housing includes a first wall and a second wall surrounding an outer periphery of the first wall. The first electrode terminal is arranged on the first wall. The electrode assembly includes an electrode body and a first tab extending from an end of the electrode body facing the first wall and electrically connected to the first electrode terminal. The first insulating component comprises a first insulating main body and a first limiting part, at least part of the first insulating main body is located between the first wall and the electrode main body, the first limiting part protrudes out of the first insulating main body, and at least part of the first limiting part is located between the second wall and the electrode main body.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and more specifically, to a battery cell, a battery, and an electrical device. Background Art

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

[0003] How to improve the reliability of battery cells is a research direction in battery technology. Utility Model Content

[0004] The present application provides a battery cell, a battery, and an electrical device, which can improve reliability.

[0005] In a first aspect, an embodiment of the present application provides a battery cell, which includes a housing, a first electrode terminal, an electrode assembly, and a first insulating member. The housing includes a first wall and a second wall surrounding the outer circumference of the first wall. The first electrode terminal is disposed on the first wall. The electrode assembly includes an electrode body and a first pole ear, the first pole ear extending from one end of the electrode body facing the first wall and electrically connected to the first electrode terminal. The first insulating member includes a first insulating body and a first limiting portion, at least a portion of the first insulating body is located between the first wall and the electrode body, the first limiting portion protrudes from the first insulating body, and at least a portion of the first limiting portion is located between the second wall and the electrode body.

[0006] When the battery cell is subjected to external impact, the first insulating body and the first limiting part can limit the vibration of the electrode body in multiple directions, thereby reducing the tension on the first pole ear, reducing the risk of the first pole ear tearing, and improving the reliability of the battery cell. In addition, the first insulating body and the first limiting part can also play an insulating role, reducing the risk of the first wall and the second wall connecting the positive and negative poles of the electrode body, and improving reliability.

[0007] In some embodiments, the battery cell further includes a pressure relief mechanism disposed on the second wall; along the thickness direction of the pressure relief mechanism, the pressure relief mechanism does not overlap with the first limiter. When thermal runaway occurs in the battery cell, the high-temperature substance released by the electrode body can be discharged through the pressure relief channel formed by the pressure relief mechanism. The first limiter does not overlap with the pressure relief mechanism, thereby reducing the barrier of the first limiter to the high-temperature substance and improving the pressure relief efficiency.

[0008] In some embodiments, the thickness of the first limit portion is 0.1 mm-1.5 mm. The thickness of the first limit portion is limited to be greater than or equal to 0.1 mm to improve the strength of the first limit portion, reduce the deformation of the first limit portion under the impact of the electrode body, increase the gap between the electrode body and the second wall, and improve the reliability of the battery cell. The thickness of the first limit portion is limited to be less than or equal to 1.5 mm to reduce the volume and weight of the first limit portion, improve space utilization, and increase the energy density of the battery cell.

[0009] In some embodiments, the first insulating body and the first limiting portion are formed integrally to improve the connection strength between the first insulating body and the first limiting portion and to simplify the assembly process of the first insulating member.

[0010] In some embodiments, the first wall and the electrode body are arranged along the first direction. The size of the electrode body along the first direction is L1, and the size of the portion of the first limiter located between the second wall and the electrode body along the first direction is L2, and L2 is smaller than L1. The first limiter may have a size smaller than the electrode body in the first direction to save space and improve energy density.

[0011] In some embodiments, the battery cell further includes a first connector, which connects the electrode body and the first limiting portion. The first connector limits the relative movement of the first limiting portion and the electrode body. When the battery cell is subjected to external impact, the first connector can restrain the electrode body, reduce the force on the first pole ear, and reduce the risk of tearing the first pole ear.

[0012] In some embodiments, the first connecting member includes a first connecting portion connected to the electrode body and a second connecting portion connected to the first limiting portion, and the first connecting member is used to limit the relative movement of the first limiting portion and the electrode body.

[0013] In some embodiments, the first connecting member comprises an adhesive tape, which is small in size and easy to assemble.

[0014] In some embodiments, the housing includes a third wall, the first wall and the third wall are arranged opposite to each other along a first direction, and the second wall connects the first wall and the third wall. The battery cell also includes a second electrode terminal arranged on the third wall, and the electrode assembly includes a second pole ear, and the second pole ear extends from one end of the electrode body facing the third wall and is electrically connected to the second electrode terminal. The battery cell also includes a second insulating member, and the second insulating member includes a second insulating body and a second limiting portion, at least a portion of the second insulating body is located between the third wall and the electrode body, the second limiting portion protrudes from the second insulating body, and at least a portion of the second limiting portion is located between the second wall and the electrode body.

[0015] When the battery cell is subjected to external impact, the second insulating body and the second limiting part can limit the vibration of the electrode body in multiple directions, thereby reducing the tension on the second pole ear, reducing the risk of the second pole ear tearing, and improving the reliability of the battery cell. In addition, the second insulating body and the second limiting part can also play an insulating role, reducing the risk of the third wall and the second wall connecting the positive and negative poles of the electrode body, and improving reliability.

[0016] In some embodiments, the second insulating body is provided with a through hole, and the second pole tab passes through the through hole and is connected to the second electrode terminal. The second insulating body can support the second pole tab, reduce the risk of the second pole tab being inserted into the electrode body backwards, and improve reliability.

[0017] In some embodiments, the battery cell further includes a third insulating member, at least a portion of which is located between the third wall and the second insulating body, and the third insulating member connects the third wall and the second insulating body. By providing the third insulating member, the insulation effect can be further improved and the reliability can be improved. The third insulating member can fix the second insulating member to the third wall, thereby improving the stability of the second insulating member.

[0018] In some embodiments, the first limiting portion and the second limiting portion are spaced apart along the first direction to reduce the risk of interference between the first limiting portion and the second limiting portion.

[0019] In some embodiments, in the first direction, the size of the electrode body is L1, the portion of the first limiter between the electrode body and the second wall is L2, and the portion of the second limiter between the electrode body and the second wall is L3; wherein 0.2≤(L2+L3) / L1≤0.8. (L2+L3) / L1 is limited to be greater than or equal to 0.2 to increase the area of ​​the electrode body to be restrained, reduce the vibration amplitude of the electrode body, reduce the risk of the tab tearing, and improve the reliability of the battery cell. (L2+L3) / L1 is limited to be less than or equal to 0.8 to reduce the space occupied by the first limiter and the second limiter, and improve the energy density of the battery cell.

[0020] In some embodiments, the housing includes a shell, a first end cap and a second end cap, the shell has a first opening and a second opening at both ends along the first direction, the first end cap is connected to the shell and covers the first opening, and the second end cap is connected to the shell and covers the second opening. The first end cap is the first wall, the shell is the second wall, and the second end cap is the third wall.

[0021] In some embodiments, the housing includes a shell and a first end cover, one end of the shell has a first opening, and the first end cover is connected to the shell and covers the first opening. The first end cover is a first wall.

[0022] In some embodiments, the first insulating member includes two first limiting portions, which are respectively located on opposite sides of the electrode body. The two first limiting portions can limit the electrode body from both sides to reduce the movement of the electrode body in the housing and reduce the risk of tearing the first tab.

[0023] In some embodiments, the first wall is located on one side of the electrode body along the first direction, and the first limit portion is located on one side of the electrode body along the second direction. In the third direction, both ends of the first limit portion do not exceed the electrode body. The first direction, the second direction and the third direction are perpendicular to each other. In the third direction, the first limit portion shares space with the electrode body, thereby improving space utilization and energy density.

[0024] In some embodiments, the first wall is located on one side of the electrode body along the first direction. The electrode body includes two first outer surfaces arranged opposite to each other along the second direction and two second outer surfaces arranged opposite to each other along the third direction, the area of ​​the first outer surface is smaller than the area of ​​the second outer surface, and the first direction, the second direction and the third direction are perpendicular to each other. The first limiter is located between the first outer surface and the second wall.

[0025] During the charging process of the battery cell, the electrode body will expand; when the electrode body expands, the deformation of the first outer surface is small. The first limiter is set between the first outer surface and the second wall, which can reduce the expansion force on the first limiter and reduce the deformation of the first limiter. When the electrode body expands, the deformation of the second outer surface is large; the first limiter avoids the second outer surface, which can reduce the risk of the first limiter squeezing the second outer surface, reduce the stress concentration on the second outer surface, reduce the risk of pole piece fracture and ion precipitation, and improve the reliability of the battery cell.

[0026] In some embodiments, the first wall is located on one side of the electrode body along the first direction. The second wall includes two first sub-walls, two second sub-walls and four bent walls, the two first sub-walls are arranged relatively along the second direction, the two second sub-walls are arranged relatively along the third direction, each bent wall connects the first sub-wall and the second sub-wall, and the first direction, the second direction and the third direction are perpendicular to each other. In the second direction, the first limit portion is located between the first sub-wall and the electrode body, and the first limit portion does not overlap with the bent wall. The bent wall can disperse stress and reduce the risk of shell rupture. The first limit portion does not overlap with the bent wall, thereby reducing the risk of deformation of the first limit portion when being squeezed by the electrode body.

[0027] In some embodiments, the area of ​​the second sub-wall is greater than the area of ​​the first sub-wall. In some embodiments, the area of ​​the second sub-wall is greater than the area of ​​the first end cap, and the area of ​​the second sub-wall is greater than the area of ​​the second end cap.

[0028] In some embodiments, the electrode body includes a straight region and a bending region, the bending region is located on one side of the straight region, and the first electrode ear is connected to the straight region. The first limiting portion is located on a side of the bending region away from the straight region. The first limiting portion can constrain the bending region to reduce deformation of the bending region during the charging and discharging process of the battery cell.

[0029] In some embodiments, a first concave portion is provided on the side of the first limit portion facing the bending zone, and a portion of the bending zone is accommodated in the first concave portion. By providing the first concave portion, the area of ​​the portion of the first limit portion that can contact the bending zone can be increased, so that the first limit portion can more effectively restrain the bending zone and reduce the deformation of the bending zone.

[0030] In some embodiments, the first limiting portion surrounds the electrode body. The first limiting portion can limit the electrode body from the periphery, reduce the vibration of the electrode body, and improve the reliability of the battery cell.

[0031] In a second aspect, an embodiment of the present application provides a battery, which includes a plurality of battery cells provided by any embodiment of the first aspect.

[0032] In a third aspect, an embodiment of the present application provides an electrical device, which includes a battery provided by any embodiment of the second aspect, and the battery is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without paying creative work.

[0034] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0035] Figure 2 An exploded schematic diagram of a battery provided in some embodiments of the present application;

[0036] Figure 3 A schematic diagram of a three-dimensional structure of a battery cell provided in some embodiments of the present application;

[0037] Figure 4 A schematic cross-sectional view of a battery cell provided in some embodiments of the present application;

[0038] Figure 5 A schematic diagram of an electrode assembly of a battery cell provided in some embodiments of the present application;

[0039] Figure 6 for Figure 5 A schematic cross-sectional view taken along the AA direction;

[0040] Figure 7 A schematic diagram of the structure of a first end cover assembly of a battery cell provided in some embodiments of the present application;

[0041] Figure 8 A schematic side view of a partial structure of a battery cell provided in some embodiments of the present application;

[0042] Fig. 9 for Figure 4 An enlarged schematic diagram at the circle B;

[0043] Fig.10 for Figure 4 An enlarged schematic diagram at the circle C;

[0044] Fig.11 for Figure 4 An enlarged schematic diagram at the circle D;

[0045] Fig.12 A schematic diagram of the structure of a second insulating member provided in some embodiments of the present application;

[0046] Fig.13 Another cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0047] Fig.14 for Fig.13 An enlarged schematic diagram at the circle frame;

[0048] Fig.15 A schematic cross-sectional view of a battery cell provided in some other embodiments of the present application;

[0049] Fig.16 Schematic cross-sectional views of battery cells provided in some other embodiments of the present application.

[0050] The following are the descriptions of the reference numerals:

[0051] 1. Vehicle; 2. Battery; 3. Controller; 4. Motor; 5. Box; 5a. First box part; 5b. Second box part; 5c. Accommodation space; 6. Battery cell;

[0052] 10. Electrode assembly; 10a. Positive electrode sheet; 10b. Negative electrode sheet; 10c. Separator; 11. Electrode body;

[0053] 111, first outer surface; 112, second outer surface; 11a, straight area; 11b, bending area; 12, first pole ear;

[0054] 13. Second pole ear;

[0055] 20, housing; 20a, first wall; 20b, second wall; 20c, third wall; 21, housing; 211, first opening; 212, second opening; 213, first sub-wall; 214, second sub-wall; 215, bent wall; 22, first end cover; 23, second end cover;

[0056] 30. a first electrode terminal; 40. a second electrode terminal;

[0057] 50. first insulating member; 51. first insulating body; 52. first limiting portion; 521. first recess;

[0058] 60, pressure relief mechanism; 70, first connecting piece; 701, first connecting portion; 702, second connecting portion; 71, second connecting piece;

[0059] 80, second insulating member; 81, second insulating body; 811, through hole; 82, second limiting portion; 90, third insulating member;

[0060] X, second direction; Y, third direction; Z, first direction. DETAILED DESCRIPTION

[0061] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0062] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. 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 and secondary relationship.

[0063] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0064] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0065] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0066] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0067] The term "plurality" used in the present application refers to two or more (including two).

[0068] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0069] Battery cells may include but are not limited to lithium ion battery cells, sodium ion battery cells, sodium lithium ion battery cells, lithium metal battery cells, sodium metal battery cells, lithium sulfur battery cells, magnesium ion battery cells, nickel metal hydride battery cells, nickel cadmium battery cells, lead storage battery cells, etc.

[0070] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery, etc. There is no particular limitation in the present application.

[0071] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0072] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0073] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are accommodated in the case.

[0074] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0075] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0076] A battery cell generally includes an electrode assembly, a housing, and an electrode terminal. The electrode assembly is contained in the housing, and the electrode terminal is disposed on the housing. The electrode assembly includes a tab, which is electrically connected to the electrode terminal; the electrode terminal can be used to electrically connect the electrode assembly to a circuit outside the battery cell to realize charging or discharging of the battery cell.

[0077] When the battery cell is subjected to external impact, the electrode assembly may vibrate inside the casing, thereby pulling the tabs, causing the risk of tab tearing and affecting the reliability of the battery cell.

[0078] In view of this, an embodiment of the present application provides a technical solution, which limits the electrode assembly by setting an insulating component in the shell, thereby reducing the vibration of the electrode assembly when the battery cell is subjected to external impact, reducing the risk of tab tearing, and improving the reliability of the battery cell.

[0079] The technical solution described in the embodiments of the present application is applicable to electrical devices using batteries.

[0080] The electrical device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, and the like; the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, and the like; 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, and the like; the electric tool may include a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railways, 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, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0081] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0082] Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application.

[0083] like Figure 1 As shown, a battery 2 is disposed inside the vehicle 1, and the battery 2 may be disposed at the bottom, head, or tail of the vehicle 1. The battery 2 may be used to power the vehicle 1, for example, the battery 2 may be used as an operating power source for the vehicle 1.

[0084] The vehicle 1 may further include a controller 3 and a motor 4 , wherein the controller 3 is used to control the battery 2 to supply power to the motor 4 , for example, to meet the power requirements of starting, navigating, and driving the vehicle 1 .

[0085] In some embodiments of the present application, the battery 2 can not only serve as an operating power source for the vehicle 1, but also serve as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0086] Figure 2 An exploded schematic diagram of a battery provided for some embodiments of the present application.

[0087] like Figure 2 As shown, the battery 2 includes a box body 5 and a battery cell 6 , and the battery cell 6 is accommodated in the box body 5 .

[0088] The box 5 is used to accommodate the battery cell 6, and the box 5 can be of various structures. In some embodiments, the box 5 can include a first box portion 5a and a second box portion 5b, the first box portion 5a and the second box portion 5b cover each other, and the first box portion 5a and the second box portion 5b jointly define a storage space 5c for accommodating the battery cell 6. The second box portion 5b can be a hollow structure with one end open, the first box portion 5a is a plate-like structure, and the first box portion 5a covers the open side of the second box portion 5b to form a box 5 with a storage space 5c; the first box portion 5a and the second box portion 5b can also be hollow structures with one side open, and the open side of the first box portion 5a covers the open side of the second box portion 5b to form a box 5 with a storage space 5c. Of course, the first box portion 5a and the second box portion 5b can be of various shapes, such as a cylinder, a cuboid, etc.

[0089] In order to improve the sealing performance after the first box body part 5a and the second box body part 5b are connected, a sealing member, such as a sealant, a sealing ring, etc., may also be provided between the first box body part 5a and the second box body part 5b.

[0090] Assuming that the first box body portion 5a covers the top of the second box body portion 5b, the first box body portion 5a can also be called an upper box cover, and the second box body portion 5b can also be called a lower box.

[0091] In the battery 2, there can be one or more battery cells 6. If there are more than one battery cell 6, the battery cells 6 can be connected in series, in parallel or in mixed connection. Mixed connection means that the battery cells 6 are both connected in series and in parallel. The battery cells 6 can be directly connected in series, in parallel or in mixed connection, and then the whole formed by the battery cells 6 can be accommodated in the box 5; of course, the battery cells 6 can also be connected in series, in parallel or in mixed connection to form a battery module, and then the battery modules can be connected in series, in parallel or in mixed connection to form a whole, and then accommodated in the box 5.

[0092] Figure 3 A schematic diagram of a three-dimensional structure of a battery cell provided in some embodiments of the present application; Figure 4 A schematic cross-sectional view of a battery cell provided in some embodiments of the present application; Figure 5 A schematic diagram of an electrode assembly of a battery cell provided in some embodiments of the present application; Figure 6 for Figure 5 Schematic cross-sectional view along the AA direction.

[0093] Reference Figures 3 to 6 An embodiment of the present application provides a battery cell 6 , which includes a housing 20 and an electrode assembly 10 , wherein the electrode assembly 10 is accommodated in the housing 20 .

[0094] The electrode assembly 10 includes a positive electrode and a negative electrode. During the charge and discharge process of the battery cell 6, active ions (such as lithium ions) are inserted and removed back and forth between the positive electrode and the negative electrode. Optionally, the electrode assembly 10 also includes a separator disposed between the positive electrode and the negative electrode, which can reduce the risk of short circuit between the positive and negative electrodes while allowing active ions to pass through.

[0095] The housing 20 is used to encapsulate the electrode assembly 10 and the electrolyte and other components. The housing 20 can be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing) or an aluminum-plastic film.

[0096] In some embodiments, the positive electrode includes a positive electrode sheet 10a. The positive electrode sheet 10a may include a positive electrode current collector and a positive electrode active material layer disposed on at least one surface of the positive electrode current collector.

[0097] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material layer is disposed on any one or both of the two facing surfaces of the positive electrode current collector.

[0098] In some embodiments, the negative electrode includes a negative electrode sheet 10 b. The negative electrode sheet 10 b may include a negative electrode current collector and a negative electrode active material layer disposed on at least one surface of the negative electrode current collector.

[0099] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0100] In some embodiments, the electrode assembly 10 further includes a separator 10c, which is used to separate the positive electrode sheet 10a from the negative electrode sheet 10b. The separator 10c can reduce the risk of short circuit between the positive and negative electrodes, while allowing active ions to pass through.

[0101] In some embodiments, the separator 10c includes a separator membrane. The separator membrane of the present application can be any known porous separator membrane with good chemical stability and mechanical stability.

[0102] In some embodiments, the electrode assembly 10 includes one or more electrode units. The electrode unit includes a positive electrode sheet 10a, a negative electrode sheet 10b, and a separator 10c, and the separator 10c insulates the positive electrode sheet 10a from the negative electrode sheet 10b. As an example, the electrode unit may be a bare cell.

[0103] In some examples, there is one electrode unit; alternatively, there are multiple electrode units, and the multiple electrode units are stacked.

[0104] In some embodiments, the shape of the electrode assembly 10 can be cylindrical, flat, or polygonal.

[0105] In some embodiments, the shape of the electrode unit can be cylindrical, flat, or polygonal.

[0106] In some embodiments, the housing 20 includes a shell 21 and an end cover, the shell 21 has an opening, and the end cover is used to cover the opening.

[0107] The housing 21 is a component used to cooperate with the end cover to form an internal cavity of the battery cell 6. The formed internal cavity can be used to accommodate the electrode assembly 10, electrolyte and other components.

[0108] The housing 21 and the end cap may be independent components. For example, an opening may be provided on the housing 21, and the end cap may be closed at the opening to form an internal cavity of the battery cell 6.

[0109] The shell 21 can be in various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism shape, etc. Specifically, the shape of the shell 21 can be determined according to the specific shape and size of the electrode assembly 10. The shell 21 can be made of various materials, for example, the material of the shell 21 includes but is not limited to copper, iron, aluminum, stainless steel, aluminum alloy, aluminum-plastic film, steel-plastic film, etc.

[0110] The shape of the end cap can be adapted to the shape of the housing 21 to match the housing 21. The material of the end cap can be the same as or different from the material of the housing 21. Optionally, the end cap can be made of a material with a certain hardness and strength (e.g., copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.), so that the end cap is not easily deformed when squeezed or collided, so that the battery cell 6 can have a higher structural strength and the reliability performance can also be improved.

[0111] The end cover is connected to the housing 21 by welding, bonding, clamping or other methods.

[0112] The housing 21 may be open at one end or at both ends. In some examples, the housing 21 may be a structure with an open end, and an end cap is provided and covers the housing 21 .

[0113] In other examples, the housing 21 may also be a structure with openings on both sides, and two end covers are provided, and the two end covers respectively cover the two openings of the housing 21. Specifically, the two ends of the housing 21 have a first opening 211 and a second opening 212, and the two end covers are respectively a first end cover 22 and a second end cover 23, the first end cover 22 is connected to the housing 21 and covers the first opening 211, and the second end cover 23 is connected to the housing 21 and covers the second opening 212.

[0114] In some embodiments, the electrode unit is a wound structure. Exemplarily, the positive electrode sheet 10a and the negative electrode sheet 10b are both strip-shaped structures, and the positive electrode sheet 10a, the separator 10c and the negative electrode sheet 10b are wound into a wound structure.

[0115] In some embodiments, the electrode unit is a laminate structure.

[0116] As an example, a plurality of positive electrode sheets 10 a and a plurality of negative electrode sheets 10 b may be provided respectively, and the plurality of positive electrode sheets 10 a and the plurality of negative electrode sheets 10 b may be alternately stacked.

[0117] As an example, a plurality of positive electrode sheets 10 a may be provided, and the negative electrode sheet 10 b may be folded to form a plurality of stacked folded segments, with one positive electrode sheet 10 a sandwiched between adjacent folded segments.

[0118] As an example, the positive electrode sheet 10 a and the negative electrode sheet 10 b are both folded to form a plurality of stacked folded sections.

[0119] In some embodiments, the electrode assembly 10 includes an electrode body 11, a first electrode tab 12, and a second electrode tab 13, wherein the first electrode tab 12 and the second electrode tab 13 have opposite polarities. The first electrode tab 12 and the second electrode tab 13 may be led out from the same end of the electrode body 11, or may be led out from opposite ends of the electrode body 11, respectively.

[0120] As an example, the electrode body 11 may include a portion of the positive electrode current collector coated with a positive electrode active material layer, a positive electrode active material layer, a portion of the negative electrode current collector coated with a negative electrode active material layer, a negative electrode active material layer, and a separator 10c. The active material in the positive electrode active material layer and the active material in the negative electrode active material layer are used to electrochemically react with an electrolyte, etc. to generate a charge and discharge process.

[0121] One of the first electrode tab 12 and the second electrode tab 13 is a positive electrode tab, and the other is a negative electrode tab. For example, the positive electrode tab may be a portion of the positive electrode current collector not coated with the positive electrode active material layer, and the negative electrode tab may be a portion of the negative electrode current collector not coated with the negative electrode active material layer.

[0122] As an example, the positive electrode tab includes a plurality of stacked aluminum foils, and the negative electrode tab includes a plurality of stacked copper foils.

[0123] In some embodiments, the first electrode tab 12 is a die-cut electrode tab or a flattened electrode tab, and the second electrode tab 13 is a die-cut electrode tab or a flattened electrode tab.

[0124] In some embodiments, there may be one or more first electrode tabs 12 .

[0125] In some embodiments, the electrode assembly 10 includes a plurality of stacked electrode units, each of which includes a main body, a first electrode tab 12 and a second electrode tab 13, and the first electrode tab 12 and the second electrode tab 13 extend from the main body. The main body may include a portion of the positive electrode current collector coated with a positive electrode active material layer, a positive electrode active material layer, a portion of the negative electrode current collector coated with a negative electrode active material layer, a negative electrode active material layer, and a separator 10c.

[0126] The electrode body 11 includes a main body portion of a plurality of electrode units.

[0127] In some embodiments, the battery cell 6 is provided with an electrode terminal, and the electrode terminal can be used to electrically connect the electrode assembly 10 with a circuit outside the battery cell 6 to achieve charging and discharging of the electrode assembly 10 .

[0128] In some embodiments, the battery cell 6 is provided with an electrode terminal, the first electrode tab 12 is electrically connected to the electrode terminal, and the second electrode tab 13 is electrically connected to the housing 20. The housing 20 and the electrode terminal can serve as two electrodes of the battery cell 6 electrically connected to an external circuit.

[0129] In other embodiments, the battery cell 6 includes a first electrode terminal 30 and a second electrode terminal 40 disposed in the housing 20 . The first electrode terminal 30 is electrically connected to the first electrode tab 12 , and the second electrode terminal 40 is electrically connected to the second electrode tab 13 .

[0130] As an example, the first electrode terminal 30 and the second electrode terminal 40 are located on the same side of the electrode body 11 , and the first electrode tab 12 and the second electrode tab 13 extend from the same end of the electrode body 11 .

[0131] As an example, the first electrode terminal 30 and the second electrode terminal 40 are respectively located on the same side of the electrode body 11 , the first electrode tab 12 extends from one end of the electrode body 11 facing the first electrode terminal 30 , and the second electrode tab 13 extends from one end of the electrode body 11 facing the second electrode terminal 40 .

[0132] In some embodiments, the battery cell 6 is a cylindrical battery cell or a square battery cell 6 .

[0133] Figure 7 A schematic diagram of the structure of a first end cover assembly of a battery cell provided in some embodiments of the present application; Figure 8 A schematic side view of a partial structure of a battery cell provided in some embodiments of the present application; Fig. 9 for Figure 4 An enlarged schematic diagram at circle B.

[0134] Reference Figures 3 to 9 , an embodiment of the present application provides a battery cell 6, which includes a shell 20, a first electrode terminal 30, an electrode assembly 10 and a first insulating member 50. The shell 20 includes a first wall 20a and a second wall 20b surrounding the outer circumference of the first wall 20a. The first electrode terminal 30 is arranged on the first wall 20a. The electrode assembly 10 includes an electrode body 11 and a first pole ear 12, and the first pole ear 12 extends from one end of the electrode body 11 facing the first wall 20a and is electrically connected to the first electrode terminal 30. The first insulating member 50 includes a first insulating body 51 and a first limiting portion 52, at least a portion of the first insulating body 51 is located between the first wall 20a and the electrode body 11, the first limiting portion 52 protrudes from the first insulating body 51, and at least a portion of the first limiting portion 52 is located between the second wall 20b and the electrode body 11.

[0135] As an example, the first wall 20a and the second wall 20b may be integrally formed, for example, the first wall 20a and the second wall 20b are two walls of the housing 21. Alternatively, the first wall 20a and the second wall 20b are independently formed and connected by welding, clamping, bonding or other processes, for example, the first wall 20a may be an end cap, and the second wall 20b may be the housing 21 or a part of the housing 21.

[0136] As an example, the second wall 20b is disposed around the first wall 20a, and may be a cylindrical structure. Optionally, the second wall 20b is a square cylinder structure or a cylindrical structure.

[0137] The first electrode tab 12 can be directly connected to the first electrode terminal 30 to electrically connect the first electrode tab 12 to the first electrode terminal 30; for example, the first electrode tab 12 is welded to the first electrode terminal 30. Alternatively, the first electrode tab 12 is connected to the first electrode terminal 30 through other conductive structures (such as a transfer sheet) to achieve electrical connection between the first electrode tab 12 and the first electrode terminal 30.

[0138] The first insulating body 51 and the first limiting portion 52 may be integrally formed, for example, the first insulating body 51 and the first limiting portion 52 may be integrally formed by injection molding. Alternatively, the first insulating body 51 and the first limiting portion 52 may be independently formed and connected by bonding, clamping or welding.

[0139] The first insulating body 51 may be entirely located between the first wall 20 a and the electrode body 11 , or only a portion thereof may be located between the first wall 20 a and the electrode body 11 .

[0140] As an example, the first insulating body 51 may be connected to the first wall 20a. For example, the first insulating body 51 may be bonded to the first wall 20a, or the first insulating body 51 may be indirectly connected to the first wall 20a through other components.

[0141] As an example, the first insulating body 51 may or may not be in contact with the electrode body 11. Optionally, the first insulating body 51 abuts against the electrode body 11.

[0142] There may be one or more first limiting portions 52 . As an example, there may be more than one first limiting portions 52 , and the plurality of first limiting portions 52 are arranged at intervals along the circumferential direction of the electrode body 11 .

[0143] As an example, the first limiting portion 52 protrudes from a side of the first insulating body 51 away from the first wall 20 a.

[0144] The first limiting portion 52 may separate a portion of the second wall 20 b from the electrode body 11 , or may separate the entire second wall 20 b from the electrode body 11 .

[0145] The first limiting portion 52 may be connected to the electrode body 11 , or may be independently provided from the electrode body 11 .

[0146] When the battery cell 6 is subjected to external impact, the first insulating body 51 and the first limiting portion 52 can limit the vibration of the electrode body 11 in multiple directions, thereby reducing the tension on the first pole ear 12, reducing the risk of the first pole ear 12 tearing, and improving the reliability of the battery cell 6. In addition, the first insulating body 51 and the first limiting portion 52 can also play an insulating role, reducing the risk of the first wall 20a and the second wall 20b conducting the positive and negative electrodes of the electrode body 11, and improving reliability.

[0147] In some embodiments, the battery cell 6 further includes a pressure relief mechanism 60 disposed on the housing 20. When short circuit, overcharge, etc. occur, the pressure relief mechanism 60 can be actuated to release the internal pressure of the battery cell 6 to the outside to reduce the risk of explosion or fire of the battery cell 6.

[0148] The pressure relief mechanism 60 may be disposed on the first wall 20a or the second wall 20b.

[0149] The pressure relief mechanism 60 refers to an element or component that is activated to release internal gas when the internal pressure or temperature of the battery cell 6 reaches a predetermined threshold. The threshold design varies according to different design requirements. The threshold may depend on one or more materials of the positive electrode sheet 10a, the negative electrode sheet 10b, the electrolyte and the separator 10c in the battery cell 6.

[0150] The pressure relief mechanism 60 may be in the form of an explosion-proof valve, an air valve, a pressure relief valve or a safety valve, and may specifically be a pressure-sensitive element or structure, that is, when the internal pressure of the battery cell 6 reaches a predetermined threshold, the pressure relief mechanism 60 performs an action or a weak area provided in the pressure relief mechanism 60 ruptures, thereby forming an opening or channel for internal pressure relief. Alternatively, the pressure relief mechanism 60 may also be a temperature-sensitive element or structure, that is, when the internal temperature of the battery cell 6 reaches a predetermined threshold, the pressure relief mechanism 60 performs an action, thereby forming an opening or channel for internal pressure relief.

[0151] The "actuation" mentioned in this application means that the pressure relief mechanism 60 is in motion or activated to a certain state, so that the internal pressure of the battery cell 6 can be released. The action produced by the pressure relief mechanism 60 may include but is not limited to: at least a part of the pressure relief mechanism 60 is broken, shattered, torn or opened, etc. When the pressure relief mechanism 60 is actuated, the high-temperature and high-pressure substances inside the battery cell 6 will be discharged from the actuated part as emissions. In this way, the battery cell 6 can be depressurized under controllable pressure, thereby avoiding potential more serious accidents.

[0152] The emissions from the battery cells 6 mentioned in the present application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode sheets, fragments of separators, high-temperature and high-pressure gases produced by the reaction, flames, and the like.

[0153] In some embodiments, the pressure relief mechanism 60 is disposed on the second wall 20b.

[0154] In some examples, the pressure relief mechanism 60 and the second wall 20b are independently formed components, and the two can be connected by welding, bonding or other methods. Alternatively, the pressure relief mechanism 60 and the second wall 20b can be formed integrally.

[0155] In some embodiments, along the thickness direction of the pressure relief mechanism 60 , the pressure relief mechanism 60 does not overlap with the first limiting portion 52 .

[0156] When the battery cell 6 experiences thermal runaway, the high-temperature substances released by the electrode body 11 can be discharged through the pressure relief channel formed by the pressure relief mechanism 60. The first limiter 52 does not overlap with the pressure relief mechanism 60, thereby reducing the barrier of the first limiter 52 to the high-temperature substances and improving the pressure relief efficiency.

[0157] In some embodiments, the thickness of the first limiting portion 52 is 0.1 mm-1.5 mm. Optionally, the thickness of the first limiting portion 52 is 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm or 1.5 mm.

[0158] In the embodiment of the present application, the thickness of the first limit portion 52 is limited to be greater than or equal to 0.1 mm, so as to improve the strength of the first limit portion 52, reduce the deformation of the first limit portion 52 under the impact of the electrode body 11, increase the gap between the electrode body 11 and the second wall 20b, and improve the reliability of the battery cell 6. In the embodiment of the present application, the thickness of the first limit portion 52 is limited to be less than or equal to 1.5 mm, so as to reduce the volume and weight of the first limit portion 52, improve the space utilization, and improve the energy density of the battery cell 6.

[0159] In some embodiments, the thickness of the first limiting portion 52 is 0.2 mm-0.8 mm.

[0160] In some embodiments, the first insulating body 51 and the first limiting portion 52 are integrally formed to improve the connection strength between the first insulating body 51 and the first limiting portion 52 and simplify the assembly process of the first insulating member 50 .

[0161] In some embodiments, the first wall 20 a and the electrode body 11 are arranged along a first direction Z. Exemplarily, the first direction Z is parallel to a thickness direction of the first wall 20 a.

[0162] In some embodiments, the size of the electrode body 11 along the first direction Z is L1, and the size of the portion of the first limit portion 52 between the second wall 20b and the electrode body 11 along the first direction Z is L2, and L2 is smaller than L1. The first limit portion 52 may have a smaller size than the electrode body 11 in the first direction Z to save space and improve energy density.

[0163] In some embodiments, the first insulating body 51 abuts against the electrode body 11 along the first direction Z. The first insulating body 51 can limit the vibration of the electrode body 11 in the first direction Z, and reduce the risk of tearing of the first electrode tab 12 .

[0164] In some embodiments, the battery cell 6 further includes a first connector 70 , which connects the electrode body 11 and the first limiting portion 52 .

[0165] The first limiting portion 52 may be connected to the electrode body 11 via one first connecting member 70 , or may be connected to the electrode body 11 via a plurality of first connecting members 70 .

[0166] The first connector 70 limits the relative movement between the first limiting portion 52 and the electrode body 11 . When the battery cell 6 is subjected to external impact, the first connector 70 can restrain the electrode body 11 , reduce the force applied to the first pole tab 12 , and reduce the risk of the first pole tab 12 being torn.

[0167] In some embodiments, the first connecting member 70 includes a first connecting portion 701 connected to the electrode body 11 and a second connecting portion 702 connected to the first limiting portion 52 , and the first connecting member 70 is used to limit the relative movement between the first limiting portion 52 and the electrode body 11 .

[0168] As an example, the first connection portion 701 may be connected to the electrode body 11 by welding, bonding or other methods, and the second connection portion 702 may be connected to the first limiting portion 52 by welding, bonding, clamping or other methods.

[0169] In some embodiments, the first connection portion 701 is located on a side of the first limiting portion 52 away from the electrode body 11. When installing the first connection member 70, it is not necessary to insert the first connection member 70 between the electrode body 11 and the first limiting portion 52, thereby reducing assembly difficulty.

[0170] In some embodiments, the first connecting member 70 comprises an adhesive tape, which is small in size and easy to assemble.

[0171] In some embodiments, the housing 20 includes a shell 21 and a first end cover 22. One end of the shell 21 has a first opening 211. The first end cover 22 is connected to the shell 21 and covers the first opening 211. The first end cover 22 is a first wall 20a.

[0172] Exemplarily, the first end cover 22 is welded to the housing 21 .

[0173] In some embodiments, the battery cell 6 includes a first end cap assembly, a housing 21, and an electrode assembly 10. The first end cap assembly includes a first end cap 22, a first insulating member 50, and a first electrode terminal 30, wherein the first electrode terminal 30 is insulated and disposed on the first end cap 22, and the first insulating member 50 is disposed on a side of the first end cap 22 facing the electrode assembly 10.

[0174] Exemplarily, the first insulating member 50 is snap-connected to the first end cover 22 .

[0175] Exemplarily, the battery cell 6 can be assembled according to the following steps: connect the first electrode tab 12 of the electrode assembly 10 to the first electrode terminal 30; bond the first connecting member 70 to the first limiting portion 52 and the electrode body 11 of the electrode assembly 10; install the electrode assembly 10 into the shell 21; and weld the first end cover 22 and the shell 21.

[0176] The first connecting member 70 can connect the electrode body 11 to the first limiting portion 52. During the process of the electrode assembly 10 being put into the shell or during the transportation of the electrode assembly 10, the first insulating component 50 can restrain the electrode body 11 through the first connecting member 70, limit the relative movement between the electrode body 11 and the first insulating component 50, reduce the force on the first pole ear 12, and reduce the risk of the first pole ear 12 tearing.

[0177] Fig.10 for Figure 4 An enlarged schematic diagram at the circle C; Fig.11 for Figure 4 An enlarged schematic diagram at the circle D; Fig.12 A schematic structural diagram of a second insulating component provided in some embodiments of the present application.

[0178] Reference Figures 8 to 12 In some embodiments, the housing 20 includes a third wall 20c, the first wall 20a and the third wall 20c are arranged opposite to each other along the first direction Z, and the second wall 20b connects the first wall 20a and the third wall 20c.

[0179] As an example, the third wall 20c and the second wall 20b may be integrally formed, for example, the third wall 20c and the second wall 20b are two walls of the housing 21. Alternatively, the third wall 20c and the second wall 20b are independently formed and connected by welding, clamping, bonding or other processes, for example, the third wall 20c may be an end cap, and the second wall 20b may be the housing 21 or a part of the housing 21.

[0180] In some embodiments, the battery cell 6 further includes a second electrode terminal 40 , and the electrode assembly 10 further includes a second electrode tab 13 . The second electrode terminal 40 is electrically connected to the second electrode tab 13 .

[0181] The second electrode tab 13 can be directly connected to the second electrode terminal 40 to electrically connect the second electrode tab 13 to the second electrode terminal 40; for example, the second electrode tab 13 is welded to the second electrode terminal 40. Alternatively, the second electrode tab 13 is connected to the second electrode terminal 40 through other conductive structures (such as a transfer sheet) to achieve electrical connection between the second electrode tab 13 and the second electrode terminal 40.

[0182] In some embodiments, the first electrode tab 12 and the second electrode tab 13 have opposite polarities. Correspondingly, the first electrode terminal 30 and the second electrode terminal 40 have opposite polarities. One of the first electrode terminal 30 and the second electrode terminal 40 is a positive terminal, and the other is a negative terminal.

[0183] In some embodiments, the battery cell 6 further includes a second electrode terminal 40 disposed on the third wall 20 c , and the electrode assembly 10 includes a second electrode tab 13 extending from one end of the electrode body 11 facing the third wall 20 c and electrically connected to the second electrode terminal 40 .

[0184] In some embodiments, the battery cell 6 also includes a second insulating component 80, the second insulating component 80 includes a second insulating body 81 and a second limiting portion 82, at least a portion of the second insulating body 81 is located between the third wall 20c and the electrode body 11, the second limiting portion 82 protrudes from the second insulating body 81, and at least a portion of the second limiting portion 82 is located between the second wall 20b and the electrode body 11.

[0185] The second insulating body 81 and the second limiting portion 82 can be integrally formed, for example, the second insulating body 81 and the second limiting portion 82 can be integrally formed by injection molding. Alternatively, the second insulating body 81 and the second limiting portion 82 are independently formed and connected by bonding, clamping or welding.

[0186] The second insulating body 81 may be entirely located between the third wall 20 c and the electrode body 11 , or only a portion thereof may be located between the third wall 20 c and the electrode body 11 .

[0187] As an example, the second insulating body 81 may be connected to the third wall 20c. For example, the second insulating body 81 may be bonded to the third wall 20c, or the second insulating body 81 may be indirectly connected to the third wall 20c through other components.

[0188] As an example, the second insulating body 81 may or may not be in contact with the electrode body 11. Optionally, the second insulating body 81 abuts against the electrode body 11.

[0189] There may be one or more second limiting portions 82 . As an example, there may be more than one second limiting portions 82 , and the plurality of second limiting portions 82 are spaced apart along the circumferential direction of the electrode body 11 .

[0190] As an example, the second limiting portion 82 protrudes from a side of the second insulating body 81 away from the third wall 20 c.

[0191] The second limiting portion 82 may separate a portion of the second wall 20 b from the electrode body 11 , or may separate the entire second wall 20 b from the electrode body 11 .

[0192] The second limiting portion 82 may be connected to the electrode body 11 , or may be independently provided from the electrode body 11 .

[0193] When the battery cell 6 is subjected to external impact, the second insulating body 81 and the second limiting portion 82 can limit the vibration of the electrode body 11 in multiple directions, thereby reducing the tension on the second pole ear 13, reducing the risk of the second pole ear 13 tearing, and improving the reliability of the battery cell 6. In addition, the second insulating body 81 and the second limiting portion 82 can also play an insulating role, reducing the risk of the third wall 20c and the second wall 20b conducting the positive and negative electrodes of the electrode body 11, and improving reliability.

[0194] In some embodiments, along the thickness direction of the pressure relief mechanism 60 , the pressure relief mechanism 60 does not overlap with the second limiting portion 82 , thereby reducing the barrier of the second limiting portion 82 to the high-temperature substance and improving the pressure relief efficiency.

[0195] In some embodiments, the thickness of the second limit portion 82 is 0.1 mm-1.5 mm. Optionally, the thickness of the second limit portion 82 is 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm or 1.5 mm.

[0196] In some embodiments, the thickness of the second limiting portion 82 is 0.2 mm-0.8 mm.

[0197] In some embodiments, the thickness of the first limiting portion 52 is equal to the thickness of the second limiting portion 82 .

[0198] In some embodiments, the second insulating body 81 and the second limiting portion 82 are integrally formed to improve the connection strength between the second insulating body 81 and the second limiting portion 82 and to simplify the assembly process of the second insulating member 80 .

[0199] In some embodiments, the second insulating body 81 is provided with a through hole 811, and the second tab 13 passes through the through hole 811 and is connected to the second electrode terminal 40. The second insulating body 81 can support the second tab 13, reduce the risk of the second tab 13 being inserted into the electrode body 11, and improve reliability.

[0200] In some embodiments, the second insulating body 81 is opposite to the electrode body 11 along the first direction Z. The first insulating body 51 and the second insulating body 81 may constrain the electrode body 11 from both sides of the first direction Z.

[0201] In some examples, the battery cell 6 further includes a second connector 71 , which connects the electrode body 11 and the second limiting portion 82 .

[0202] The second connector 71 limits the relative movement between the second limiting portion 82 and the electrode body 11 . When the battery cell 6 is subjected to external impact, the second connector 71 can restrain the electrode body 11 , reduce the force on the second pole tab 13 , and reduce the risk of the second pole tab 13 tearing.

[0203] In some embodiments, the second connecting member 71 includes adhesive tape.

[0204] In some embodiments, the battery cell 6 further includes a third insulating member 90 , at least a portion of which is located between the third wall 20 c and the second insulating body 81 , and the third insulating member 90 connects the third wall 20 c and the second insulating body 81 .

[0205] The third insulating member 90 can be connected to the second insulating body 81 by bonding, clamping or other means. The third insulating member 90 can be connected to the three walls by bonding, clamping or other means.

[0206] The third insulating member 90 can further improve the insulation effect and reliability. The third insulating member 90 can fix the second insulating member 80 to the third wall 20 c, thereby improving the stability of the second insulating member 80 .

[0207] In some embodiments, the first limiting portion 52 and the second limiting portion 82 are spaced apart along the first direction Z to reduce the risk of interference between the first limiting portion 52 and the second limiting portion 82 .

[0208] In some embodiments, in the first direction Z, the size of the electrode body 11 is L1, the portion of the first limiting portion 52 located between the electrode body 11 and the second wall 20b is L2, and the portion of the second limiting portion 82 located between the electrode body 11 and the second wall 20b is L3. 0.2≤(L2+L3) / L1≤0.8.

[0209] Optionally, (L2+L3) / L1 is 0.2, 0.3, 0.4, 0.5, 0.6, 0.7 or 0.8.

[0210] In the embodiment of the present application, (L2+L3) / L1 is limited to be greater than or equal to 0.2, so as to increase the area where the electrode body 11 is restrained, reduce the vibration amplitude of the electrode body 11, reduce the risk of the tab tearing, and improve the reliability of the battery cell 6. In the embodiment of the present application, (L2+L3) / L1 is limited to be less than or equal to 0.8, so as to reduce the space occupied by the first limit portion 52 and the second limit portion 82, and improve the energy density of the battery cell 6.

[0211] In some embodiments, L2 is equal to L3.

[0212] In some embodiments, L2≥2 mm. Optionally, L2 is 2 mm, 3 mm, 5 mm, 8 mm, 10 mm, 12 mm, 15 mm, 18 mm or 20 mm.

[0213] In some embodiments, L2 ≥ 5 mm.

[0214] In some embodiments, L3≥2 mm. Optionally, L3 is 2 mm, 3 mm, 5 mm, 8 mm, 10 mm, 12 mm, 15 mm, 18 mm or 20 mm.

[0215] In some embodiments, L3 ≥ 5 mm.

[0216] In some embodiments, the housing 20 includes a shell 21, a first end cover 22, and a second end cover 23. The shell 21 has a first opening 211 and a second opening 212 at both ends along the first direction Z. The first end cover 22 is connected to the shell 21 and covers the first opening 211. The second end cover 23 is connected to the shell 21 and covers the second opening 212. The first end cover 22 is a first wall 20a, the shell 21 is a second wall 20b, and the second end cover 23 is a third wall 20c.

[0217] Exemplarily, the second end cover 23 is welded to the housing 21 .

[0218] In some embodiments, the battery cell 6 includes a first end cap assembly, a second end cap assembly, a second insulating member 80, a housing 21, and an electrode assembly 10. The first end cap assembly includes a first end cap 22, a first insulating member 50, and a first electrode terminal 30, the first electrode terminal 30 is insulated and disposed on the first end cap 22, and the first insulating member 50 is disposed on a side of the first end cap 22 facing the electrode assembly 10. The first end cap assembly includes a second end cap 23, a third insulating member 90, and a second electrode terminal 40, the second electrode terminal 40 is insulated and disposed on the second end cap 23, and the third insulating member 90 is disposed on a side of the second end cap 23 facing the electrode assembly 10.

[0219] Exemplarily, the battery cell 6 can be assembled according to the following steps:

[0220] Step (100): Connecting the first electrode tab 12 of the electrode assembly 10 to the first electrode terminal 30 of the first end cap assembly;

[0221] Step (200): bonding the first connecting member 70 to the first limiting portion 52 and the electrode body 11 of the electrode assembly 10;

[0222] Step (300): passing the second electrode tab 13 through the through hole 811 of the second insulating body 81 of the second insulating member 80, and making the second insulating body 81 abut against the electrode body 11;

[0223] Step (400): bonding the second connecting member 71 to the second limiting portion 82 and the electrode body 11 of the electrode assembly 10;

[0224] Step (500): inserting the second insulating member 80 and the electrode body 11 into the housing 21 through the first opening 211 of the housing 21, and extending the second electrode tab 13 from the second opening 212;

[0225] Step (600): Connecting the second electrode tab 13 to the second electrode terminal 40 of the second end cap assembly;

[0226] Step (700): welding the first end cover 22 and the housing 21;

[0227] Step (800): bend the second electrode tab 13, and clamp the third insulating member 90 of the second end cover assembly to the second insulating member 80;

[0228] Step (900) is to weld the second end cover 23 and the housing 21.

[0229] There is no particular order in which step (600) and step (700) are performed.

[0230] Since the first connecting member 70 connects the electrode body 11 to the first limiting portion 52, and the second connecting member 71 connects the electrode body 11 to the second limiting portion 82, in step (500) or in the transportation process before step (500), the first insulating component 50 can restrain the electrode body 11 through the first connecting member 70 to limit the relative movement between the electrode body 11 and the first insulating component 50, and the second insulating component 80 is connected to the electrode body 11 and is not easy to fall off the electrode body 11.

[0231] The second insulating body 81 of the second insulating member 80 can block the second electrode tab 13 during the process of bending the second electrode tab 13 , thereby reducing the risk of the second electrode tab 13 being inserted into the electrode body 11 and improving reliability.

[0232] In some embodiments, the first insulating component 50 , the second insulating component 80 , and the third insulating component 90 are all made of plastic.

[0233] Fig.13 Another cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application; Fig.14 for Fig.13 Enlarged diagram of the circle.

[0234] Reference Fig. 9 , Fig.13 and Fig.14In some embodiments, the first insulating member 50 includes two first limiting portions 52, and the two first limiting portions 52 are respectively located on opposite sides of the electrode body 11. The two first limiting portions 52 can limit the electrode body 11 from both sides to reduce the movement of the electrode body 11 in the housing 20 and reduce the risk of tearing the first tab 12.

[0235] As an example, the two first limiting portions 52 are respectively located on two sides of the electrode body 11 along the second direction X.

[0236] As an example, the second direction X is perpendicular to the first direction Z.

[0237] As an example, the thickness direction of the pressure relief mechanism is parallel to the second direction X.

[0238] In some embodiments, the first limiting portion 52 is in the shape of a flat plate.

[0239] In some embodiments, the second limiting portion is in the shape of a flat plate.

[0240] In some embodiments, the battery cell 6 includes two first connectors 70, and the two first connectors 70 respectively connect the two first limit portions 52 to the electrode body 11. In an alternative embodiment, the battery cell 6 includes one first connector 70, and the connector connects the two first limit portions 52 to the electrode body 11, for example, the first connector 70 surrounds the electrode body 11 for at least one cycle.

[0241] In some embodiments, the second insulating member 80 includes two second limiting portions 82 , and the two second limiting portions 82 are respectively located on two opposite sides of the electrode body 11 .

[0242] As an example, the two second limiting portions 82 are respectively located on two sides of the electrode body 11 along the second direction X.

[0243] In some embodiments, the battery cell 6 includes two second connectors 71 , and the two second connectors 71 respectively connect the two second limiting portions 82 to the electrode body 11 .

[0244] In some embodiments, the first wall 20a is located on one side of the electrode body 11 along the first direction Z, and the first limiter 52 is located on one side of the electrode body 11 along the second direction X. In the third direction Y, both ends of the first limiter 52 do not exceed the electrode body 11. The first direction Z, the second direction X, and the third direction Y are perpendicular to each other. In the third direction Y, the first limiter 52 shares space with the electrode body 11, thereby improving space utilization and energy density.

[0245] Illustratively, after the first end cap assembly and the electrode assembly 10 are assembled, the electrode body 11 can be placed on the side of the conveyor belt along the third direction Y; at this time, the first limiting portion 52 is spaced from the conveyor belt, and the first limiting portion 52 does not need to bear the gravity of the electrode body 11, thereby reducing the risk of relative movement between the first limiting portion 52 and the electrode body 11 along the third direction Y.

[0246] In some embodiments, in the third direction Y, both ends of the second limiting portion 82 do not extend beyond the electrode body 11 .

[0247] In some embodiments, in the third direction Y, the size of the first limiting portion 52 is equal to the size of the second limiting portion 82 .

[0248] In some embodiments, the dimension of the first limiting portion 52 along the third direction Y is less than or equal to the dimension of the electrode body 11 along the third direction Y. Optionally, the dimension of the first limiting portion 52 along the third direction Y is 0.6 to 0.95 times the dimension of the electrode body 11 along the third direction Y.

[0249] In some embodiments, the size of the second limiter 82 along the third direction Y is less than or equal to the size of the electrode body 11 along the third direction Y. Optionally, the size of the second limiter 82 along the third direction Y is 0.6 to 0.95 times the size of the electrode body 11 along the third direction Y.

[0250] In some embodiments, the first wall 20a is located on one side of the electrode body 11 along the first direction Z. The electrode body 11 includes two first outer surfaces 111 arranged opposite to each other along the second direction X and two second outer surfaces 112 arranged opposite to each other along the third direction Y. The area of ​​the first outer surface 111 is smaller than the area of ​​the second outer surface 112. The first direction Z, the second direction X, and the third direction Y are perpendicular to each other. The first stopper 52 is located between the first outer surface 111 and the second wall 20b.

[0251] During the charging process of the battery cell 6, the electrode body 11 will expand; when the electrode body 11 expands, the deformation of the first outer surface 111 is small. The first limiter 52 is arranged between the first outer surface 111 and the second wall 20b, which can reduce the expansion force on the first limiter 52 and reduce the deformation of the first limiter 52. When the electrode body 11 expands, the deformation of the second outer surface 112 is large; the first limiter 52 avoids the second outer surface 112, which can reduce the risk of the first limiter 52 squeezing the second outer surface 112, reduce the stress concentration of the second outer surface 112, reduce the risk of the pole piece breaking and the risk of ion precipitation, and improve the reliability of the battery cell 6.

[0252] In some embodiments, the second outer surface 112 is substantially planar.

[0253] In some embodiments, at least a portion of the first outer surface 111 is arc-shaped.

[0254] In some embodiments, the first outer surface 111 and the second outer surface 112 are formed on the isolation member 10 c .

[0255] In some embodiments, at least a portion of the first connector 70 is bonded to the first outer surface 111. Optionally, the first connector 70 is not bonded to the second outer surface 112.

[0256] In some embodiments, at least a portion of the second connecting member 71 is bonded to the first outer surface 111. Optionally, the second connecting member 71 is not bonded to the second outer surface 112.

[0257] In some embodiments, the positive electrode sheet 10 a and the negative electrode sheet 10 b of the electrode assembly 10 are stacked along the third direction Y.

[0258] In some embodiments, the battery cell 6 is a square-shell battery cell.

[0259] In some embodiments, the first wall 20a is located on one side of the electrode body 11 along the first direction Z. The second wall 20b includes two first sub-walls 213, two second sub-walls 214, and four bent walls 215. The two first sub-walls 213 are arranged opposite to each other along the second direction X, and the two second sub-walls 214 are arranged opposite to each other along the third direction Y. Each bent wall 215 connects the first sub-wall 213 and the second sub-wall 214. The first direction Z, the second direction X, and the third direction Y are perpendicular to each other. In the second direction X, the first limiter 52 is located between the first sub-wall 213 and the electrode body 11, and the first limiter 52 does not overlap with the bent wall 215.

[0260] The bent wall 215 can disperse stress and reduce the risk of breaking the housing 20. The first limiting portion 52 does not overlap with the bent wall 215, thereby reducing the risk of deformation of the first limiting portion 52 when being squeezed by the electrode body 11.

[0261] In some embodiments, in the second direction X, the second limiting portion 82 is located between the first sub-wall 213 and the electrode body 11 , and the second limiting portion 82 does not overlap with the bending wall 215 .

[0262] In some embodiments, in the third direction Y, the size of the first sub-wall 213 is larger than the size of the first limiting portion 52 , and the size of the first sub-wall 213 is larger than the size of the second limiting portion 82 .

[0263] In some embodiments, when the battery cell 6 is placed sideways, that is, when the second direction X is parallel to the vertical direction, the first limiting portion 52 and the second limiting portion 82 can also support the electrode body 11 to reduce the risk of the bending wall 215 squeezing the electrode body 11 .

[0264] In some embodiments, the inner surface of the bending wall 215 is an arc surface, and the radius of the arc surface is greater than the thickness of the first limiting portion 52 .

[0265] Fig.15 Schematic cross-sectional views of battery cells provided in some other embodiments of the present application.

[0266] Reference Fig.15 In some embodiments, the electrode body 11 includes a straight region 11 a and a bending region 11 b , the bending region 11 b is located on one side of the straight region 11 a , and the first electrode tab is connected to the straight region 11 a .

[0267] The straight region 11a is a region of the electrode assembly 10 having a straight structure, in which the positive electrode sheet 10a and the negative electrode sheet 10b are substantially straightly arranged. Exemplarily, the surface of each layer of the positive electrode sheet 10a and the surface of each layer of the negative electrode sheet 10b in the straight region 11a are substantially flat.

[0268] The bending area 11b is a region of the electrode assembly 10 having a bending structure, and both the positive electrode sheet 10a and the negative electrode sheet 10b are bent in the bending area 11b. Exemplarily, the portion of the positive electrode sheet 10a located in the bending area 11b is generally bent into an arc shape, and the portion of the negative electrode sheet 10b located in the bending area 11b is generally bent into an arc shape.

[0269] In some embodiments, the first limiting portion 52 is located on a side of the bending area 11b away from the straight area 11a. The first limiting portion 52 can constrain the bending area 11b to reduce deformation of the bending area 11b during the charging and discharging process of the battery cell 6.

[0270] In some embodiments, the second limiting portion 82 is located on a side of the bending region 11 b away from the straight region 11 a .

[0271] In some embodiments, the first connecting member 70 and the second connecting member 71 are both connected to the bending region 11 b.

[0272] In some embodiments, a first recess 521 is disposed on a side of the first limiting portion 52 facing the bending region 11 b , and the bending region 11 b is at least partially accommodated in the first recess 521 .

[0273] By providing the first recess 521, the area of ​​the portion of the first limiting portion 52 that can contact the bending zone 11b can be increased, so that the first limiting portion 52 can more effectively restrain the bending zone 11b and reduce the deformation of the bending zone 11b.

[0274] In some embodiments, the first recess 521 is a contoured recess corresponding to the shape of the bending region 11 b .

[0275] In some embodiments, a second recess is disposed on a side of the second limiting portion 82 facing the bending area 11 b , and a portion of the bending area 11 b is accommodated in the second recess.

[0276] Fig.16 Schematic cross-sectional views of battery cells provided in some other embodiments of the present application.

[0277] like Fig.16 As shown, in some embodiments, the first limiting portion 52 surrounds the electrode body 11. The first limiting portion 52 can limit the electrode body 11 from the periphery, reduce the vibration of the electrode body 11, and improve the reliability of the battery cell 6.

[0278] In some embodiments, the battery cells 6 are cylindrical battery cells.

[0279] In some embodiments, the second limiting portion surrounds the electrode body 11 .

[0280] According to some embodiments of the present application, the present application further provides a battery, comprising a plurality of battery cells 6 according to any one of the above embodiments.

[0281] According to some embodiments of the present application, the present application further provides an electric device, including a battery cell 6 of any of the above embodiments, the battery cell 6 is used to provide electric energy for the electric device. The electric device can be any of the above equipment or systems using the battery cell 6.

[0282] Reference Figures 3 to 14 The embodiment of the present application provides a battery cell 6, which includes a shell 21, an electrode assembly 10, a first end cover assembly, a second end cover assembly, a second insulating member 80, a first connector 70 and a second connector 71.

[0283] The housing 21 has a first opening 211 and a second opening 212 at both ends along the first direction Z. At least a portion of the electrode assembly 10 is accommodated in the housing 21 .

[0284] The first end cap assembly includes a first end cap 22 , a first insulating component 50 and a first electrode terminal 30 . The first end cap 22 covers the first opening 211 . The first electrode terminal 30 is insulated and disposed on the first end cap 22 . The first insulating component 50 is disposed on a side of the first end cap 22 facing the electrode assembly 10 .

[0285] The first end cap assembly includes a second end cap 23 , a third insulating member 90 and a second electrode terminal 40 . The second end cap 23 covers the second opening 212 . The second electrode terminal 40 is insulated and disposed on the second end cap 23 . The third insulating member 90 is disposed on a side of the second end cap 23 facing the electrode assembly 10 .

[0286] The electrode assembly 10 includes an electrode body 11, a first electrode tab 12 and a second electrode tab 13. The first electrode tab 12 and the second electrode tab 13 have opposite polarities. The first electrode tab 12 extends from one end of the electrode body 11 facing the first end cover 22 and is electrically connected to the first electrode terminal 30. The second electrode tab 13 extends from one end of the electrode body 11 facing the first end cover 22 and is electrically connected to the second electrode terminal 40.

[0287] The first insulating member 50 includes a first insulating body 51 and two first limiting portions 52. At least a portion of the first insulating body 51 is located between the first end cover 22 and the electrode body 11, and the first insulating body 51 is fixed to the first end cover 22 and abuts against the electrode body 11. The first limiting portion 52 protrudes from the side of the first insulating body 51 away from the first end cover 22; the two first limiting portions 52 are respectively located on both sides of the electrode body 11 along the second direction X, and the second direction X is perpendicular to the first direction Z. In the second direction X, at least a portion of the first limiting portion 52 is located between the shell 21 and the electrode body 11.

[0288] The second insulating member 80 includes a second insulating body 81 and two second limiting portions 82. At least a portion of the second insulating body 81 is located between the third insulating member 90 and the electrode body 11, and the second insulating body 81 is fixed to the third insulating member 90 and abuts against the electrode body 11. The second limiting portion 82 protrudes from the side of the second insulating body 81 away from the second end cover 23. The two second limiting portions 82 are respectively located on both sides of the electrode body 11 along the second direction X. In the second direction X, at least a portion of the second limiting portion 82 is located between the shell 21 and the electrode body 11.

[0289] In the first direction Z, the first limiting portion 52 and the second limiting portion 82 are arranged at intervals.

[0290] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0291] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein, but these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cell, characterized in that: include: A housing comprising a first wall and a second wall surrounding a periphery of the first wall; A first electrode terminal, disposed on the first wall; An electrode assembly, comprising an electrode body and a first electrode tab, wherein the first electrode tab extends from one end of the electrode body facing the first wall and is electrically connected to the first electrode terminal; as well as The first insulating component includes a first insulating body and a first limiting portion, wherein at least a portion of the first insulating body is located between the first wall and the electrode body, the first limiting portion protrudes from the first insulating body, and at least a portion of the first limiting portion is located between the second wall and the electrode body.

2. The battery cell according to claim 1, characterized in that: The battery cell further includes a pressure relief mechanism disposed on the second wall; along a thickness direction of the pressure relief mechanism, the pressure relief mechanism does not overlap with the first limiting portion.

3. The battery cell according to claim 1, characterized in that: The thickness of the first limiting portion is 0.1 mm-1.5 mm.

4. The battery cell according to claim 1, characterized in that: The first insulating body and the first limiting portion are formed integrally.

5. The battery cell according to claim 1, characterized in that: The first wall and the electrode body are arranged along a first direction; The size of the electrode body along the first direction is L1, and the size of a portion of the first limiting portion located between the second wall and the electrode body along the first direction is L2, and L2 is smaller than L1.

6. The battery cell according to claim 1, characterized in that: The battery cell further includes a first connecting member, and the first connecting member connects the electrode body and the first limiting portion.

7. The battery cell according to claim 6, characterized in that: The first connecting member includes a first connecting portion connected to the electrode body and a second connecting portion connected to the first limiting portion, and the first connecting member is used to limit the relative movement between the first limiting portion and the electrode body.

8. The battery cell according to claim 6, characterized in that: The first connecting member includes an adhesive tape.

9. The battery cell according to any one of claims 1 to 8, characterized in that: The housing includes a third wall, the first wall and the third wall are arranged opposite to each other along a first direction, and the second wall connects the first wall and the third wall; The battery cell further includes a second electrode terminal disposed on the third wall, and the electrode assembly includes a second electrode tab, the second electrode tab extending from one end of the electrode body facing the third wall and electrically connected to the second electrode terminal; The battery cell also includes a second insulating component, which includes a second insulating body and a second limiting portion, at least a portion of the second insulating body is located between the third wall and the electrode body, the second limiting portion protrudes from the second insulating body, and at least a portion of the second limiting portion is located between the second wall and the electrode body.

10. The battery cell according to claim 9, characterized in that: The second insulating body is provided with a through hole, and the second electrode tab passes through the through hole and is connected to the second electrode terminal.

11. The battery cell according to claim 9, characterized in that: The battery cell further includes a third insulating member, at least a portion of which is located between the third wall and the second insulating body, and the third insulating member connects the third wall and the second insulating body.

12. The battery cell according to claim 9, characterized in that: The first limiting portion and the second limiting portion are arranged at intervals along the first direction.

13. The battery cell according to claim 9, characterized in that: In the first direction, the size of the electrode body is L1, the portion of the first limiting portion located between the electrode body and the second wall is L2, and the portion of the second limiting portion located between the electrode body and the second wall is L3; Among them, 0.2≤(L2+L3) / L1≤0.

8.

14. The battery cell according to claim 9, characterized in that: The housing comprises a shell, a first end cover and a second end cover, the shell has a first opening and a second opening at both ends along the first direction, the first end cover is connected to the shell and covers the first opening, and the second end cover is connected to the shell and covers the second opening; The first end cover is the first wall, the shell is the second wall, and the second end cover is the third wall.

15. The battery cell according to claim 1, characterized in that: The housing comprises a shell and a first end cover, one end of the shell has a first opening, and the first end cover is connected to the shell and covers the first opening; The first end cover is the first wall.

16. The battery cell according to claim 1, characterized in that: The first insulating component includes two first limiting portions, and the two first limiting portions are respectively located on two opposite sides of the electrode body.

17. The battery cell according to claim 1, characterized in that: The first wall is located on one side of the electrode body along the first direction, and the first limiting portion is located on one side of the electrode body along the second direction; In the third direction, both ends of the first limiting portion do not exceed the electrode body; The first direction, the second direction and the third direction are perpendicular to each other.

18. The battery cell according to claim 1, characterized in that: The first wall is located on one side of the electrode body along the first direction; The electrode body comprises two first outer surfaces arranged opposite to each other along a second direction and two second outer surfaces arranged opposite to each other along a third direction, the area of ​​the first outer surface is smaller than the area of ​​the second outer surface, and the first direction, the second direction and the third direction are perpendicular to each other; The first limiting portion is located between the first outer surface and the second wall.

19. The battery cell according to claim 17, characterized in that: The first wall is located on one side of the electrode body along the first direction; The second wall includes two first sub-walls, two second sub-walls and four bent walls, the two first sub-walls are arranged opposite to each other along the second direction, the two second sub-walls are arranged opposite to each other along the third direction, each bent wall connects the first sub-wall and the second sub-wall, and the first direction, the second direction and the third direction are perpendicular to each other; In the second direction, the first limiting portion is located between the first sub-wall and the electrode body, and the first limiting portion does not overlap with the bending wall.

20. The battery cell according to claim 1, characterized in that The electrode body comprises a straight area and a bending area, the bending area is located on one side of the straight area, and the first electrode tab is connected to the straight area; The first limiting portion is located at a side of the bending area away from the straight area.

21. The battery cell according to claim 20, characterized in that: A first recess is disposed on a side of the first limiting portion facing the bending area, and a portion of the bending area is accommodated in the first recess.

22. The battery cell according to claim 1, characterized in that: The first limiting portion surrounds the electrode body.

23. A battery, characterized in that: The invention comprises a plurality of battery cells according to any one of claims 1 to 22.

24. An electrical device, characterized in that: A battery according to claim 23, for providing electrical energy.

Images