CN216389612U - Battery monomer, battery and power consumption device - Google Patents

Abstract

The application discloses battery monomer, battery and power consumption device. The battery cell includes: a case having a receiving cavity for receiving an electrode assembly, the case being electrically connected to the electrode assembly; the shell further comprises an extension part extending along a first direction, the first direction is a direction in which the edge of the shell faces the accommodating cavity, and the extension part is used for being electrically connected with other battery units; wherein the extension length of at least part of the extension part along the first direction is L, and L is more than or equal to 2mm and less than or equal to 20 mm. The battery monomer of this application embodiment is through having the extension of predetermineeing length at the casing setting for battery monomer promotes joint strength when carrying out the electricity with the casing.

Description

Battery monomer, battery and power consumption device

Technical Field

The application relates to the technical field of batteries, in particular to a battery monomer, a battery and an electric device.

Background

Energy conservation and emission reduction are the key points of sustainable development of the automobile industry, and electric vehicles become important components of the sustainable development of the automobile industry due to the advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in its development.

During the grouping process of the battery cells, the electrical connection through the housing is often required. However, the problem of insufficient connection strength often occurs when the existing shell is electrically connected. Therefore, how to improve the connection strength of the electrical connection when the battery cells are grouped becomes an urgent problem to be solved.

SUMMERY OF THE UTILITY MODEL

In view of the above problems, embodiments of the present application provide a battery cell, a battery, and an electric device, which can improve the connection strength of electrical connection when the battery cells are electrically grouped.

In a first aspect, the present application provides a battery cell, comprising: a case having a receiving cavity for receiving an electrode assembly, the case being electrically connected to the electrode assembly; the shell further comprises an extension part extending along a first direction, the first direction is a direction in which the edge of the shell faces the accommodating cavity, and the extension part is used for being electrically connected with other battery units; wherein the extension length of at least part of the extension part along the first direction is L, and L is more than or equal to 2mm and less than or equal to 20 mm.

In the technical scheme of the embodiment of the application, the edge of the shell is provided with the extension part which is electrically connected with other battery cells, the extension part extends towards the direction of the accommodating cavity in the shell, and the extension length L of at least part of the extension part meets the requirement that L is more than or equal to 2mm and less than or equal to 20 mm. Due to the design, in the process of grouping the battery monomers, the extending part on the shell can be used as a connecting area for being electrically connected with other battery monomers, and the extending length of at least part of the extending part is within the preset range, so that the connecting area can be ensured to have a large enough area for being electrically connected with other battery monomers, and the connecting strength is effectively improved; especially, when the extension part is used as a welding area to be electrically connected with other battery cells, the welding area can be effectively increased, and the welding strength is further improved.

In some embodiments, the extension includes a first extension and a second extension, the first extension has an extension length along the first direction of L1, the second extension has an extension length along the first direction of L2, and satisfies: l1 is more than or equal to 2mm and less than or equal to 20mm, and L2 is less than 2 mm. Through set up two extension portions that extend length difference on the casing, can increase the flexibility that the casing used, satisfy different functional requirement.

In some embodiments, the first extension and the second extension are connected to each other. Through with first extension and second extension interconnect for battery monomer is at the difficult deformation of process of uniting, thereby has improved the stability when the battery uses.

In some embodiments, the first extension and the second extension are integrally formed. Through with first extension and second extension integrated into one piece, can reduce the manufacturing degree of difficulty of extension, reliability when promoting the casing electricity simultaneously and connect.

In some embodiments, the first extension part is provided in plurality, and the first extension parts are arranged at intervals; and/or the second extending part is provided with a plurality of second extending parts which are arranged at intervals. Through setting up a plurality of interval distribution's first extension and/or second extension, can increase the flexibility that the casing used, satisfy different functional requirements.

In some embodiments, a plurality of the first extension portions and a plurality of the second extension portions are alternately disposed. The plurality of first extending parts and the plurality of second extending parts are alternately arranged, so that the first extending parts can be uniformly distributed on the edge of the shell, and the use flexibility of the shell is improved.

In some embodiments, the battery cell is a cylindrical battery cell, the first direction is perpendicular to an axis of the cylindrical battery cell, and the extension is disposed about the axis. Through arranging the extension part around the axis of the cylindrical battery monomer, the arrangement direction and the angle of the battery monomer can be adjusted at will when the battery monomer is grouped, and the improvement of the production efficiency is facilitated.

In a second aspect, the present application provides a battery, which includes the battery cell provided in the first aspect of the present application, and a case for accommodating the battery cell.

In a third aspect, the present application provides an electrical device comprising a battery as provided in the second aspect of the present application, the battery being configured to provide electrical energy.

The foregoing description is only an overview of the technical solutions of the present application, and the present application can be implemented according to the content of the description in order to make the technical means of the present application more clearly understood, and the following detailed description of the present application is given in order to make the above and other objects, features, and advantages of the present application more clearly understandable.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for a person skilled in the art to obtain other drawings based on the drawings without any creative effort.

FIG. 1 is a schematic illustration of a vehicle according to an embodiment of the present disclosure;

fig. 2 is an exploded view of a battery according to an embodiment of the present disclosure;

fig. 3 is an exploded view of a battery cell according to an embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of a battery cell disclosed in an embodiment of the present application;

fig. 5 is a top view of a battery cell in the Z-direction according to an embodiment of the present disclosure;

fig. 6 is a top view of a battery cell in the Z-direction according to an embodiment of the present disclosure;

fig. 7 is a top view of a battery cell along the Z-direction according to an embodiment of the present disclosure

Fig. 8 is a top view of a battery cell in the Z-direction according to an embodiment of the present disclosure.

The reference numbers in the detailed description are as follows:

a vehicle 1000;

battery 100, controller 200, motor 300;

a box 10, a first part 11, a second part 12;

battery cell 20, end cap 21, electrode terminal 21a, case 22, electrode assembly 23;

the extension part 221, the first extension part 221a, the second extension part 221b, and the receiving cavity 231.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application in the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the description and claims of this application or in the above-described drawings are used for distinguishing between different elements and not for describing a particular sequential or chronological order.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "attached" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

The term "and/or" in this application is only one kind of association relationship describing the associated object, and means that there may be three kinds of relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" in this application generally indicates that the former and latter related objects are in an "or" relationship.

The "plurality" in the present application means two or more (including two), and similarly, "plural" means two or more (including two) and "plural" means two or more (including two).

At present, batteries of electric vehicles often need dozens or even thousands of battery cells.

With the increasing severity of energy problems and environmental problems, electric vehicles with the advantages of national subsidies, clean energy and the like are gradually popularized, and more consumers select new energy vehicles. The power battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles and the like, and a plurality of fields such as military equipment and aerospace. The application field of the power battery is continuously expanded, and the market demand of the power battery is also continuously expanded.

The applicant has noted that current cells are typically electrically connected by extensions on the housing when grouped. Taking the electric device as an example of a vehicle, the battery cells in the battery have conductive housings, and the adjacent battery cells are electrically connected through the extending regions at the ends of the housings so as to integrate the battery cells into a battery module. However, as the number of grouped cells increases, the strength of the electrical connection between the cells also increases accordingly. Therefore, the battery cell is provided, the extending part for being electrically connected with other battery cells is arranged at the edge of the shell towards the direction of the shell accommodating cavity, and the extending length L of at least part of the extending part satisfies 2mm L20 mm.

Based on the technical scheme, in the process of grouping the battery monomers, the extending part on the battery shell can be used as a connecting area for being electrically connected with other battery monomers, and the extending length of at least part of the extending part is within the preset range, so that the connecting area can be ensured to have a large enough area for being electrically connected with other battery monomers, and the connecting strength is effectively improved; especially, when the extension part is used as a welding area to be electrically connected with other battery cells, the welding area can be effectively increased, and the welding strength is further improved.

The embodiment of the application provides an electric device using a battery as a power supply, wherein the battery is used for providing electric energy for the electric device, and the electric device can be but is not limited to a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric automobile, a ship, a spacecraft and the like. The electric toy may include a stationary or mobile electric toy, such as a game machine, an electric car toy, an electric ship toy, an electric airplane toy, and the like, and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, and the like.

For convenience of description, the following embodiments take an example in which a power consuming apparatus according to an embodiment of the present application is a vehicle 1000.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the present disclosure. The vehicle 1000 may be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile may be a pure electric automobile, a hybrid electric automobile, or a range-extended automobile, etc. The battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom or the head or the tail of the vehicle 1000. The battery 100 may be used for power supply of the vehicle 1000, for example, the battery 100 may serve as an operation power source of the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to supply power to the motor 300, for example, for starting, navigation, and operational power requirements while the vehicle 1000 is traveling.

In some embodiments of the present application, the battery 100 may be used not only as an operating power source of the vehicle 1000, but also as a driving power source of the vehicle 1000, instead of or in part of fuel or natural gas, to provide driving power for the vehicle 1000.

Referring to fig. 2, fig. 2 is an exploded view of a battery 100 according to some embodiments of the present disclosure. The battery 100 includes a case 10 and a battery cell 20, and the battery cell 20 is accommodated in the case 10. The case 10 is used to provide a receiving space for the battery cells 20, and the case 10 may have various structures. In some embodiments, the case 10 may include a first portion 11 and a second portion 12, the first portion 11 and the second portion 12 cover each other, and the first portion 11 and the second portion 12 together define a receiving space for receiving the battery cell 20. The second part 12 may be a hollow structure with one open end, the first part 11 may be a plate-shaped structure, and the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a containing space; the first portion 11 and the second portion 12 may be both hollow structures with one side open, and the open side of the first portion 11 may cover the open side of the second portion 12. Of course, the case 10 formed by the first and second portions 11 and 12 may have various shapes, such as a cylinder, a rectangular parallelepiped, and the like.

In the battery 100, the number of the battery cells 20 may be multiple, and the multiple battery cells 20 may be connected in series or in parallel or in series-parallel, where in series-parallel refers to both series connection and parallel connection among the multiple battery cells 20. The plurality of battery cells 20 can be directly connected in series or in parallel or in series-parallel, and the whole formed by the plurality of battery cells 20 is accommodated in the box body 10; of course, the battery 100 may also be formed by connecting a plurality of battery cells 20 in series, in parallel, or in series-parallel to form a battery module, and then connecting a plurality of battery modules in series, in parallel, or in series-parallel to form a whole, and accommodating the whole in the case 10. The battery 100 may further include other structures, for example, the battery 100 may further include a bus member for achieving electrical connection between the plurality of battery cells 20.

Wherein each battery cell 20 may be a secondary battery or a primary battery; but is not limited to, a lithium sulfur battery, a sodium ion battery, or a magnesium ion battery.

Referring to fig. 3, fig. 3 is an exploded schematic view of a battery cell 20 according to some embodiments of the present disclosure. The battery cell 20 refers to the smallest unit constituting the battery. As shown in fig. 3, the battery cell 20 includes an end cap 21, a case 22, an electrode assembly 23, and other functional components.

The end cap 21 refers to a member that covers an opening of the case 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 21 may be adapted to the shape of the housing 22 to fit the housing 22. Alternatively, the end cap 21 may be made of a material (e.g., an aluminum alloy) having a certain hardness and strength, so that the end cap 21 is not easily deformed when being impacted, and the battery cell 20 may have a higher structural strength and improved safety. The end cap 21 may be provided with functional components such as the electrode terminals 21 a. The electrode terminals 21a may be used to be electrically connected with the electrode assembly 23 for outputting or inputting electric energy of the battery cells 20. In some embodiments, the end cap 21 may further include a pressure relief mechanism for relieving the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold value. The material of the end cap 21 may also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not limited in this embodiment. In some embodiments, insulation may also be provided on the inside of the end cap 21, which may be used to isolate the electrical connection components within the housing 22 from the end cap 21 to reduce the risk of short circuits. Illustratively, the insulator may be plastic, rubber, or the like.

The case 22 is an assembly for mating with the end cap 21 to form an internal environment of the battery cell 20, wherein the formed internal environment may be used to house the electrode assembly 23, electrolyte, and other components. The housing 22 and the end cap 21 may be separate components, and an opening may be formed in the housing 22, and the opening may be covered by the end cap 21 to form the internal environment of the battery cell 20. Without limitation, the end cap 21 and the housing 22 may be integrated, and specifically, the end cap 21 and the housing 22 may form a common connecting surface before other components are inserted into the housing, and when it is necessary to enclose the inside of the housing 22, the end cap 21 covers the housing 22. The housing 22 may be a variety of shapes and sizes, such as rectangular parallelepiped, cylindrical, hexagonal prism, etc. Specifically, the shape of the case 22 may be determined according to the specific shape and size of the electrode assembly 23. The material of the housing 22 may be various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not limited in the embodiments of the present invention.

The electrode assembly 23 is a part in which electrochemical reactions occur in the battery cell 100. One or more electrode assemblies 23 may be contained within the case 22. The electrode assembly 23 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is generally disposed between the positive electrode sheet and the negative electrode sheet.

According to some embodiments of the present application, referring to fig. 3, and referring to fig. 4 and fig. 5, fig. 4 is a schematic structural diagram of a battery cell disclosed in an embodiment of the present application. The present application provides a battery cell 20. The battery cell 20 includes a housing 22. The housing 22 has an accommodation chamber 231. The receiving cavity 231 is used to receive the electrode assembly 23. The case 22 is electrically connected to the electrode assembly 23. The housing 22 further includes an extension 221 extending in the first direction X. The first direction X is a direction in which the edge of the housing 22 faces the accommodation chamber 231. The extension part 221 is used to electrically connect with other battery cells. Wherein, the extension length of at least part of the extension part 221 along the first direction X is L, and L is more than or equal to 2mm and less than or equal to 20 mm.

As shown in the drawing, the X direction is a direction in which the edge of the housing 22 faces the accommodating chamber 231, and the Z direction is a height direction of the housing 22.

Referring to fig. 4, the end of the side wall of the housing 22 in the Z direction in the figure is an edge of the housing 22. The extending portion 221 is formed by extending an end portion of the side wall of the housing 22 toward the direction of the accommodating chamber 231 (i.e., the X direction). In some embodiments, the extension 221 is formed by bending an end of a sidewall of the housing 22 toward the direction of the receiving cavity 231 (i.e., the X direction). The extension 221 is used to provide a connection region to electrically connect with an adjacent battery cell when the battery is grouped, and electric energy of the battery can be transmitted from one battery cell to another through the extension 221 on the case 22. In order to adapt to the use environment and the manufacturing environment inside the battery, the extension part 221 should be made of a material having a deformation ability and a conductive ability, and for example, an aluminum or steel material may be used. The extension 221 may be of various shapes and sizes, such as circular, fan-shaped, or irregular patterns, to accommodate the requirements of the battery when it is to be grouped.

The extending part 221 is arranged at the edge of the shell 22, so that in the battery grouping process, the extending part 221 on the shell 22 can be used as a connecting area for being electrically connected with other battery monomers 20, and the extending length of at least part of the extending part 221 is within the preset range, so that the connecting area can be ensured to have a large enough area for being electrically connected with other battery monomers 20, and the connecting strength is effectively improved; especially, when the extension part 221 is electrically connected to other battery cells 20 as a welding region, the welding area can be effectively increased, thereby improving the welding strength.

According to some embodiments of the present application, referring to fig. 5, the extension part 221 includes a first extension part 221a and a second extension part 221b, an extension length of the first extension part 221a in the first direction X is L1, an extension length of the second extension part 221b in the first direction X is L2, and satisfies: l1 is more than or equal to 2mm and less than or equal to 20mm, and L2 is less than 2 mm.

The first extension part 221a refers to a part of the extension part 221 with a larger extension length, i.e., the extension length L1 of the first extension part 221a is greater than the extension length L2 of the second extension part 221 b.

By arranging the two extending parts 221 with different extending lengths on the shell, the flexibility of the use of the shell can be increased, and different functional requirements can be met.

According to some embodiments of the present application, referring to fig. 6, the first extension 221a and the second extension 221b are connected to each other.

The first extension part 221a and the second extension part 221b can be connected to each other by welding or gluing, etc. to form a whole, and the arrangement between the first extension part 221a and the second extension part 221b is flexible as long as at least partial connection is satisfied.

By connecting the first extension part 221a and the second extension part 221b with each other, the case 22 is not easily bent and deformed during the process of grouping the batteries, thereby improving the stability and safety performance of the battery assembly.

According to some embodiments of the present application, referring to fig. 7, the first extension 221a and the second extension 221b are integrally formed.

The first extension part 221a and the second extension part 221b may be formed in one step by the same material in a production process, and the forming manner may be stamping.

By integrally forming the first extension portion 221a and the second extension portion 221b, the difficulty in manufacturing the extension portions 221 can be effectively reduced, and meanwhile, the integrally formed extension portions 221 are not connected to generate uneven surfaces, so that the reliability of the electrical connection between the battery cells 20 can be improved.

According to some embodiments of the present application, referring to fig. 8, the first extension portion 221a is provided in plurality, and the plurality of first extension portions 221a are provided at intervals; and/or the second extension part 221b is provided in plurality, and the plurality of second extension parts 221b are provided at intervals.

Adjacent two first extension portions 221a of the plurality of first extension portions 221a are separated from each other, in some embodiments, a second extension portion 221b may be disposed between adjacent two first extension portions 221a, and the second extension portion 221b and the first extension portion 221a may be separated from each other or connected to each other. The second extension portion 221b is similar to the first extension portion 221a, and is not described herein again.

By providing a plurality of first extension portions 221a and/or second extension portions 221b distributed at intervals, the flexibility of the use of the housing 22 can be increased, and different functional requirements can be met.

According to some embodiments of the present application, the plurality of first extension portions 221a and the plurality of second extension portions 221b are alternately disposed.

The plurality of first extension portions 221a and the plurality of second extension portions 221b are arranged in a manner of the first extension portions 221a, the second extension portions 221b, the first extension portions 221a, and the second extension portions 221b … …, that is, are alternately arranged. The first and second extension parts 221a and 221b may be connected to or separated from each other.

By alternately arranging the first extension parts 221a and the second extension parts 221b, the first extension parts 221a can be more uniformly distributed on the edge of the shell 22, and the flexibility of the shell 22 in use is increased.

According to some embodiments of the present application, referring to fig. 4, the battery cell 20 is a cylindrical battery cell, the first direction X is perpendicular to an axis a of the cylindrical battery cell, and the extension portion 221 is disposed about the axis a.

By arranging the extension part 221 around the axis a of the battery cell 20, the battery cell 20 can be assembled by arbitrarily adjusting the arrangement direction and angle of the battery cells when being grouped, which is beneficial to improving the production efficiency.

According to some embodiments of the present application, the present application further provides a battery 100, which includes a case 10 and the battery cell 20 provided in any of the above embodiments, wherein the battery cell 20 is accommodated in the case 10.

According to some embodiments of the present application, there is also provided an electrical device, including the battery 100, where the battery 100 is used for providing electrical energy for the electrical device.

The powered device may be any of the aforementioned devices or systems that employ battery 100.

Reference is made to fig. 3-5, 7-8, according to some embodiments of the present application. The present application provides a battery cell 20. The battery cell 20 is a cylindrical battery cell and includes a housing 22 having a receiving cavity 231. The receiving cavity 231 is used to receive the electrode assembly 23. The case 22 is electrically connected to the electrode assembly 23. The housing 22 further includes an extension 221 extending in the first direction X. The first direction X is a direction in which the edge of the case 22 faces the receiving cavity 231, and the first direction X is perpendicular to an axis a of the cylindrical battery cell about which the extending portion 221 is disposed. The extension part 221 is used to electrically connect with other battery cells. The extending portion 221 includes a first extending portion 221a and a second extending portion 221b, an extending length of the first extending portion 221a along the first direction X is L1, an extending length of the second extending portion 221b along the first direction X is L2, and satisfies: l1 is more than or equal to 2mm and less than or equal to 20mm, and L2 is less than 2 mm. As shown in fig. 8, the battery cell 20 includes three first extending portions 221a and three second extending portions 221b, which are spaced apart from each other, and the first extending portions 221a and the second extending portions 221b are alternately disposed and integrally formed.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present disclosure, and the present disclosure should be construed as being covered by the claims and the specification. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.

Claims (9)

1. A battery cell, comprising:

a case having a receiving cavity for receiving an electrode assembly, the case being electrically connected to the electrode assembly;

the shell further comprises an extension part extending along a first direction, the first direction is a direction in which the edge of the shell faces the accommodating cavity, and the extension part is used for being electrically connected with other battery units;

wherein the extension length of at least part of the extension part along the first direction is L, and L is more than or equal to 2mm and less than or equal to 20 mm.

2. The battery cell as recited in claim 1, wherein the extension portion comprises a first extension portion and a second extension portion, the first extension portion has an extension length L1 along the first direction, the second extension portion has an extension length L2 along the first direction, and the extension lengths are as follows: l1 is more than or equal to 2mm and less than or equal to 20mm, and L2 is less than 2 mm.

3. The battery cell as recited in claim 2 wherein the first extension and the second extension are connected to each other.

4. The battery cell of claim 3, wherein the first extension and the second extension are integrally formed.

5. The battery cell as recited in claim 2, wherein the first extending portion is provided in plurality, and the first extending portions are provided at intervals; and/or

The second extension part is provided with a plurality of, a plurality of the second extension part interval sets up.

6. The battery cell as recited in claim 5 wherein the first and second extensions are alternately disposed.

7. The battery cell of any of claims 1-6, wherein the battery cell is a cylindrical battery cell, the first direction is perpendicular to an axis of the cylindrical battery cell, and the extension is disposed about the axis.

8. A battery, comprising:

the battery cell of any one of claims 1-7; and

and the box body is used for accommodating the battery monomer.

9. An electrical device comprising the battery of claim 8, wherein the battery is configured to provide electrical energy.

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