CN220984598U - Battery monomer, battery and power consumption device - Google Patents

Abstract

The application provides a battery monomer, a battery and an electricity utilization device. The battery unit comprises a shell, a cover plate assembly, an electrode assembly, first insulating pieces and second insulating pieces, wherein the cover plate assembly covers the opening of the shell to form a cavity for accommodating the electrode assembly; the second insulating part is arranged on one side of the electrode assembly, which is away from the cover plate assembly, and comprises at least one insulating part, the insulating part is arranged between the shell and the lug, and the insulating part of the second insulating part is used for dislocation of the first insulating part under the action of external force, so that when the lug is separated from the cavity part of the first insulating part, the insulating part of the second insulating part can still keep the insulation of the lug and the bottom wall of the shell, and the reliability of the battery monomer is improved.

Description

Battery monomer, battery and power consumption device

Technical Field

The present application relates to the field of battery technologies, and in particular, to a battery cell, a battery and an electric device.

Background

With the continuous development of new energy automobile markets, the power battery industry is rapidly expanding and growing, the lithium battery technology is increasingly refined, and higher requirements on the safety performance, the energy density and the industrialization of battery monomers are provided.

In order to improve the safety performance of the battery cell, the electrode assembly needs to be insulated and protected by an insulating assembly so as to avoid short circuit of the battery cell caused by contact between the electrode assembly and the shell. There is an insulating assembly wrapped around the tabs at two ends of the electrode assembly in the related art, but the insulating assembly is easily biased under the action of external force during the production and use of the battery, so that the risk of short circuit between the tabs and the housing is increased, and improvement is needed.

Disclosure of utility model

In view of the above, the present application provides a battery cell, a battery, and an electric device, which can improve insulation reliability between a tab and a case.

In a first aspect, the present application provides a battery cell comprising: a housing including an opening; the cover plate component is covered on the opening; the electrode assembly is arranged in the shell, the electrode assembly further comprises electrode lugs arranged at two ends of the first direction, the cover plate assembly is positioned at one side of the electrode assembly in the second direction, and the first direction is intersected with the second direction; the first insulating parts are respectively arranged at two sides of the electrode assembly in the first direction, part of the first insulating parts are arranged between the cover plate assembly and the electrode assembly, each first insulating part comprises a cavity which faces to the main body and is opened, and the lugs are accommodated in the cavities; the second insulating part is arranged on one side, away from the cover plate assembly, of the electrode assembly in the second direction and comprises at least one insulating part, and the insulating part is arranged between the shell and the lug.

In the scheme of the embodiment of the application, the battery monomer comprises a shell, a cover plate assembly, an electrode assembly, first insulating pieces and second insulating pieces, wherein the shell comprises an opening, the cover plate assembly covers the opening to form a cavity for accommodating the electrode assembly, the electrode assembly is arranged in the shell, the electrode lugs are respectively arranged at two ends of the electrode assembly in a first direction, the cover plate assembly is positioned at one side of the electrode assembly in a second direction, the two first insulating pieces are respectively arranged at two sides of the electrode assembly in the first direction, part of the first insulating pieces are arranged between the cover plate assembly and the electrode assembly so as to improve the insulating effect of the cover plate assembly and the electrode assembly through the first insulating pieces, the first insulating pieces comprise cavities facing the opening of the main body, and the electrode lugs are accommodated in the cavities so as to insulate the electrode lugs through the first insulating pieces and the inner wall of the shell; the second insulating part is arranged on one side, deviating from the cover plate assembly, of the electrode assembly in the second direction, the second insulating part comprises at least one insulating part, the insulating part is arranged between the shell and the lug, and one end, deviating from the cover plate assembly, of the first insulating part is dislocated under the action of external force, so that when the lug is separated from the cavity part of the first insulating part, the insulating part of the second insulating part can still keep insulation between the lug and the bottom wall of the shell, and the reliability of the battery is improved.

In some embodiments, the second insulating member includes two insulating portions disposed at intervals along the first direction, and the second insulating member further includes a connecting portion connecting the two insulating portions.

In the technical scheme of the embodiment of the application, the second insulating piece comprises two insulating parts which are arranged at intervals along the first direction, and the second insulating piece also comprises a connecting part which is connected with the two insulating parts, on one hand, the connecting part is arranged between the battery cell assembly and the shell, and the insulating effect between the battery cell assembly and the shell is improved; on the other hand connects two insulating parts through connecting portion to make the second insulating part form a bigger size part, in the battery monomer preparation in-process, the second insulating part of jumbo size is snatched the installation more easily, improves preparation efficiency.

In some embodiments, the electrode assembly includes two sidewalls disposed opposite to each other in a thickness direction thereof, and an arc wall connected between the two sidewalls, the arc wall being located at an end of the electrode assembly facing away from the cap assembly, and the arc wall extending in a second direction and facing away from the cap assembly, the second insulating member including an accommodating space bent away from the cap assembly, at least a portion of the arc wall being accommodated in the accommodating space.

In the technical scheme of the embodiment of the application, the electrode assembly comprises two side walls which are oppositely arranged in the thickness direction of the electrode assembly and an arc-shaped wall connected between the two side walls, the arc-shaped wall is positioned at one end of the electrode assembly, which is away from the cover plate assembly, and extends along a second direction and is arranged in a protruding way, the second insulating part comprises an accommodating space which is bent away from the cover plate, and at least part of the arc-shaped wall is accommodated in the accommodating space, so that the accommodating space of the second insulating part can play a role of storing electrolyte to supplement the electrolyte extruded from the inside of the electrode assembly in the circulation process, and the electrolyte is convenient to flow back; and the arc-shaped wall is accommodated in the accommodating space and plays a role in positioning the second insulating piece.

In some embodiments, the sidewall is located between the cover assembly and the second insulator in the second direction.

In the technical scheme of the embodiment of the application, the side wall is positioned between the cover plate assembly and the second insulating piece along the second direction, the second insulating piece and the side wall of the electrode assembly are arranged at intervals, the second insulating piece cannot increase the overall thickness of the battery unit, and the problems of stress concentration and damage to the side wall of the electrode assembly caused by the fact that the second insulating piece abuts against the side wall of the electrode assembly are avoided.

In some embodiments, the two sidewalls have a spacing D in the thickness direction thereof, and the second insulator has a height H in the second direction that is equal to or less than D/2.

In the technical scheme of the embodiment of the application, when the distance between the two side walls in the thickness direction and the height of the second insulating part in the second direction meet the above relation, the second insulating part and the side walls do not interfere with each other, so that the problem that the second insulating part damages the side walls of the electrode assembly in the thickness direction of the electrode assembly and the thickness of the battery cell is increased due to the second insulating part is solved.

In some embodiments, the second insulator further comprises an end wall connected to an end of the insulator in the first direction, the end wall and the tab being aligned in the first direction.

In the technical scheme of the embodiment of the application, the second insulating piece further comprises an end wall, the end wall is connected with the end part of the insulating part in the first direction, the end wall and the electrode lugs are arranged along the first direction, so that the electrode lugs can play a role in positioning the second insulating piece through the end wall, and the end wall and the electrode lugs are arranged because the edge of the electrode lugs is relatively sharp, so that the risk that the electrode lugs penetrate through the first insulating piece and/or the second insulating piece to lead the electrode lugs to be conducted with the inner wall of the battery shell is reduced.

In some embodiments, the end wall is located between the tab and the first insulator in the first direction, or the end wall is disposed on a side of the first insulator facing away from the electrode assembly.

In the technical scheme of the embodiment of the application, the end wall is positioned between the lug and the first insulating piece along the first direction, and the lug plays a role in positioning the second insulating piece through the end wall; the end wall sets up in one side that the first insulating part deviates from the electrode assembly, and the second insulating part plays the fixed action to the first insulating part through the end wall, reduces under the exogenic action, and the risk that the utmost point ear deviate from the first insulating part.

In some embodiments, an end wall is connected to the first insulator at an end facing away from the second insulator in the second direction.

In the technical solution of the embodiment of the application, one end of the end wall facing away from the second insulating member in the second direction is connected to the first insulating member, and the first insulating member and the second insulating member are fixed to each other by the end wall.

In some embodiments, at least a portion of the insulation is disposed between the first insulation and the tab along the second direction.

In the technical scheme of the embodiment of the application, at least part of the insulation part is arranged between the first insulation part and the tab along the second direction, and the insulation part is fixed by the first insulation part and the tab, so that the problem of movement of the insulation part under the action of external force is solved.

In a second aspect, embodiments of the present application provide a battery comprising the battery cell of the embodiments of the first aspect.

In a third aspect, an embodiment of the present application provides an electrical device, including a battery according to the embodiment of the second aspect.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:

FIG. 1 is a schematic view of a vehicle according to an embodiment of the present application;

fig. 2 is a schematic structural view of a battery according to an embodiment of the present application;

Fig. 3 is a schematic view of a battery module according to an embodiment of the present disclosure;

fig. 4 is an exploded view of a battery cell according to an embodiment of the present application;

fig. 5 is a top view of a battery cell according to an embodiment of the present application;

FIG. 6 is a cross-sectional view at A-A in FIG. 5;

Fig. 7 is a schematic structural view of a second insulating member of a battery cell according to an embodiment of the present application;

fig. 8 is a schematic structural view of a second insulating member of a battery cell according to another embodiment of the present application;

FIG. 9 is a cross-sectional view at B-B in FIG. 5;

Fig. 10 is a schematic structural view of a second insulating member of a battery cell according to another embodiment of the present application;

fig. 11 is a schematic view illustrating a part of a structure of a battery cell according to an embodiment of the present application;

Fig. 12 is a schematic view illustrating a part of a structure of a battery cell according to another embodiment of the present application;

Fig. 13 is a schematic structural view of a second insulating member of a battery cell according to still another embodiment of the present application.

Reference numerals illustrate:

1. a vehicle; 101. a motor; 102. a controller;

2. A battery; 201. a battery module; 202. a case; 2021. a first box portion; 2022. a second box portion;

3. a battery cell;

4. a housing;

5. An electrode assembly; 51. a tab; 52. a main body; 53. a sidewall; 54. an arc-shaped wall;

6. A cover plate assembly;

7. A first insulating member;

8. a second insulating member; 81. an insulating part; 82. a connection part; 83. an end wall; 831. a first segment; 832. and a second segment.

Detailed Description

Embodiments of the technical scheme of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present application, and thus are merely examples, and are not intended to limit the scope of the present application.

It should be noted that unless otherwise indicated, technical or scientific terms used in the embodiments of the present application should be given the ordinary meanings as understood by those skilled in the art to which the embodiments of the present application belong.

In the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the embodiments of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present application.

Furthermore, the technical terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.

In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to specific circumstances.

In the description of embodiments of the application, unless expressly specified and limited otherwise, a first feature "up" or "down" on a second feature may be that the first and second features are in direct contact, or that the first and second features are in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

Currently, the application of power batteries is more widespread from the development of market situation. 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, aerospace, and the like. With the continuous expansion of the application field of the power battery, the market demand of the power battery is also continuously expanding.

In the present application, the battery cells may include a lithium ion secondary battery cell, a lithium ion primary battery cell, a lithium sulfur battery cell, a sodium lithium ion battery cell, a sodium ion battery cell, or a magnesium ion battery cell, which is not limited in the embodiment of the present application. The battery cell may be in a cylindrical shape, a flat shape, a rectangular parallelepiped shape, or other shapes, which is not limited in this embodiment of the application.

Reference to a battery in accordance with an embodiment of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the present application may include a battery module or a battery pack, or the like. The battery generally includes a case for enclosing one or more battery cells. The case body can prevent liquid or other foreign matters from affecting the charge or discharge of the battery cells.

The battery cell comprises an electrode assembly and electrolyte, wherein the electrode assembly comprises a positive electrode plate, a negative electrode plate and a separator. The battery cell mainly relies on metal ions to move between the positive pole piece and the negative pole piece to work. The positive electrode plate comprises a positive electrode current collector and a positive electrode active material layer, and the positive electrode active material layer is coated on the surface of the positive electrode current collector; the positive current collector comprises a positive current collecting part and a positive lug connected to the positive current collecting part, wherein the positive current collecting part is coated with a positive active material layer, and the positive lug is not coated with the positive active material layer. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, the positive electrode active material layer includes a positive electrode active material, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate or the like. The negative electrode plate comprises a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode current collector; the negative electrode current collector comprises a negative electrode current collecting part and a negative electrode tab connected to the negative electrode current collecting part, wherein the negative electrode current collecting part is coated with a negative electrode active material layer, and the negative electrode tab is not coated with the negative electrode active material layer. The material of the anode current collector may be copper, the anode active material layer includes an anode active material, and the anode active material may be carbon or silicon, or the like. The material of the separator may be PP (polypropylene) or PE (polyethylene), etc.

With the continuous development of new energy automobile markets, the power battery industry is rapidly expanding and growing, the lithium battery technology is increasingly refined, and higher requirements on the safety performance, the energy density and the industrialization of battery monomers are provided. In order to improve the safety performance of the battery cell, the electrode assembly needs to be insulated and protected by an insulating assembly so as to avoid short circuit of the battery cell caused by contact between the electrode assembly and the shell.

In the related art, two ends of an electrode assembly are respectively provided with a tab, an insulating assembly is respectively arranged at two sides of the electrode assembly, the tabs are wrapped in a cavity of the insulating assembly, and one end of the insulating assembly is fixed between a cover plate assembly and the electrode assembly. And under the exogenic action, the insulating subassembly deviates from the one end of apron subassembly and takes place the skew easily, leads to part utmost point ear to deviate from insulating subassembly, and the short circuit risk of the inner wall of utmost point ear and casing deviating from apron subassembly this moment promotes, and battery reliability descends.

Based on the above-mentioned problems, an embodiment of the present application provides a battery cell, where the battery cell includes a case, a cover plate assembly, an electrode assembly, a first insulating member and a second insulating member, the case includes an opening, the cover plate assembly covers the opening to form a chamber for accommodating the electrode assembly, the electrode assembly is disposed in the case, tabs are disposed at two ends of the electrode assembly in a first direction, the cover plate assembly is disposed at one side of the electrode assembly in a second direction, two first insulating members are disposed at two sides of the electrode assembly in the first direction, a portion of the first insulating members are disposed between the cover plate assembly and the electrode assembly to improve an insulating effect of the cover plate assembly and the electrode assembly by the first insulating members, the first insulating members include a chamber facing the opening of the main body, and the tabs are accommodated in the chamber to insulate the tabs by the first insulating members and an inner wall of the case; the second insulating part is arranged on one side, deviating from the cover plate assembly, of the electrode assembly in the second direction, the second insulating part comprises at least one insulating part, the insulating part is arranged between the shell and the lug, and one end, deviating from the cover plate assembly, of the first insulating part is dislocated under the action of external force, so that when the lug is separated from the cavity part of the first insulating part, the insulating part of the second insulating part can still keep insulation between the lug and the bottom wall of the shell, and the reliability of the battery is improved.

The technical scheme described by the embodiment of the application is suitable for the battery and the power utilization device using the battery.

The electric device may be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool, or the like. The vehicle can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle; spacecraft including airplanes, rockets, space planes, spacecraft, and the like; the electric toy includes fixed or mobile electric toys, such as a game machine, an electric car toy, an electric ship toy, and an electric airplane toy; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete shakers, and electric planers, among others. The embodiment of the application does not limit the electric device in particular.

It should be understood that the technical solutions described in the embodiments of the present application are not limited to the above-described batteries and electric devices, but may be applied to all batteries including a case and electric devices using the batteries, but for simplicity of description, the following embodiments are described by taking an electric vehicle as an example.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1 according to some embodiments of the application. The vehicle 1 can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extending vehicle. The interior of the vehicle 1 is provided with a battery 2, which may be provided at the bottom or at the head or at the tail of the vehicle 1. The battery 2 may be used for power supply of the vehicle 1, for example, the battery 2 may serve as an operating power source of the vehicle 1. The vehicle 1 may also include a controller 102 and a motor 101, the controller 102 being configured to control a battery to power the motor 101, for example, for operating power requirements during start-up, navigation, and travel of the vehicle 1.

In some embodiments of the application, the battery may not only serve as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, instead of or in part instead of fuel oil or natural gas, to provide driving power for the vehicle 1.

To meet different demands for power use, the battery 2 may include a plurality of battery cells, which means the smallest units constituting a battery module or a battery pack. Multiple cells may be connected in series and/or parallel via electrode terminals for use in various applications. The battery 2 mentioned in the present application includes a battery module or a battery pack. The battery cells can be connected in series or parallel or in series-parallel connection, and the series-parallel connection refers to the mixture of series connection and parallel connection. In the embodiment of the application, a plurality of battery monomers can directly form a battery pack, or can form a battery module first, and then form the battery pack.

Fig. 2 shows a schematic structure of a battery 2 according to an embodiment of the present application.

As shown in fig. 2, the battery includes a case 202 and a battery cell (not shown) housed in the case 202.

The case 202 may have a simple three-dimensional structure such as a rectangular parallelepiped, a cylinder, or a sphere, or may have a complex three-dimensional structure formed by combining simple three-dimensional structures such as a rectangular parallelepiped, a cylinder, or a sphere. The material of the case 202 may be an alloy material such as aluminum alloy or iron alloy, a polymer material such as polycarbonate or polyisocyanurate foam, or a composite material such as glass fiber and epoxy resin.

The case 202 is used to house the battery cells, and the case 202 may have various structures. In some embodiments, the case 202 may include a first case portion 2021 and a second case portion 2022, where the first case portion 2021 and the second case portion 2022 are mutually covered, and the first case portion 2021 and the second case portion 2022 together define an accommodating space for accommodating the battery cell 3. The second housing portion 2022 may be a hollow structure having one end opened, the first housing portion 2021 is a plate-like structure, and the first housing portion 2021 is covered on the opening side of the second housing portion 2022 to form the housing 202 having an accommodation space; the first housing portion 2021 and the second housing portion 2022 may each be a hollow structure having an opening at one side, and the opening side of the first housing portion 2021 is covered with the opening side of the second housing portion 2022 to form the housing 202 having the accommodation space. Of course, the first housing portion 2021 and the second housing portion 2022 may be of various shapes, such as a cylinder, a rectangular parallelepiped, or the like.

In order to improve the sealing property after the first housing portion 2021 and the second housing portion 2022 are connected, a sealing member, such as a sealant, a seal ring, or the like, may be provided between the first housing portion 2021 and the second housing portion 2022.

Assuming that the first housing portion 2021 is covered on top of the second housing portion 2022, the first housing portion 2021 may also be referred to as an upper cover, and the second housing portion 2022 may also be referred to as a lower cover.

In the battery 2, the number of battery cells may be one or more. If the number of the battery cells is multiple, the multiple battery cells can be connected in series or in parallel or in series-parallel connection, and the series-parallel connection means that the multiple battery cells are connected in series or in parallel. The plurality of battery cells can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the plurality of battery cells is accommodated in the box 202; of course, a plurality of battery cells may be connected in series or parallel or in series to form the battery module 201, and then the plurality of battery modules 201 are connected in series or parallel or in series to form a whole and are accommodated in the case 202.

Fig. 3 shows a schematic structure of a battery module 201 according to an embodiment of the present application.

In some embodiments, as shown in fig. 2 and 3, the battery cells 3 are plural, and the plural battery cells 3 are first connected in series or parallel or series-parallel to form the battery module 201. The plurality of battery modules 201 are then connected in series or parallel or a series-parallel combination to form a unit and are accommodated in the case 202.

The plurality of battery cells 3 in the battery module 201 may be electrically connected through a bus bar member to realize parallel connection or series-parallel connection of the plurality of battery cells 3 in the battery module 201.

In the present application, the battery cell 3 may include a lithium ion battery cell, a sodium ion battery cell, a magnesium ion battery cell, or the like, which is not limited in the embodiment of the present application.

Fig. 4 is an exploded view of a battery cell 3 according to an embodiment of the present application. The battery cell 3 refers to the smallest unit constituting the battery. As shown in fig. 4, the battery cell 3 includes a cap plate assembly 6, a case 4, and an electrode assembly 5.

The electrode assembly 5 is a component in which electrochemical reactions occur in the battery cells 3. One or more electrode assemblies 5 may be contained within the case 4. The electrode assembly 5 is mainly formed by winding or stacking a pole piece, which is divided into a positive pole piece and a negative pole piece, and a separator is generally provided between the positive pole piece and the negative pole piece. The portions of the positive electrode sheet and the negative electrode sheet having active materials constitute an electrode body, and the portions of the positive electrode sheet and the negative electrode sheet having no active materials constitute tabs, respectively. The positive electrode tab and the negative electrode tab may be located at one end of the main body portion together or located at two ends of the main body portion respectively. During charge and discharge of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab is connected with the electrode terminal to form a current loop.

The case 4 is an assembly for cooperating with the cap plate assembly 6 to form an internal environment of the battery cell 3, wherein the formed internal environment may be used to accommodate the electrode assembly 5, an electrolyte (not shown in the drawings), and other components. The housing 4 and the cover assembly 6 may be separate components, and an opening may be provided in the housing 4, and the opening may be covered by the cover assembly 6 at the opening to form an internal environment of the battery cell 3. Alternatively, the cover plate assembly 6 and the housing 4 may be integrated. Alternatively, the cover assembly 6 and the housing 4 may be formed with a common connection surface prior to insertion of the other components into the housing, and the cover assembly 6 is then allowed to cover the housing 4 when it is desired to encapsulate the interior of the housing 4. The material of the housing 4 may be various, and optionally, the material of the housing 4 may be copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

Referring to fig. 4 to 7, fig. 4 is an exploded view of a battery cell according to an embodiment of the application; fig. 5 is a top view of a battery cell according to an embodiment of the present application; FIG. 6 is a cross-sectional view at A-A in FIG. 5; fig. 7 is a schematic structural view of a second insulating member of a battery cell according to an embodiment of the present application.

In a first aspect, as shown in fig. 4 to 7, the present application provides a battery cell 3, the battery cell 3 including a case 4, a cap plate assembly 6, an electrode assembly 5, a first insulating member 7, and a second insulating member 8, the case 4 including an opening; the cover plate component 6 covers the opening; the electrode assembly 5 is arranged in the shell 4, the electrode assembly 5 further comprises electrode lugs 51 arranged at two ends of the electrode assembly in the first direction X, the cover plate assembly 6 is positioned at one side of the electrode assembly 5 in the second direction Y, and the first direction X is intersected with the second direction Y; two first insulating members 7 are respectively arranged at two sides of the electrode assembly 5 in the first direction X, part of the first insulating members 7 are arranged between the cover plate assembly 6 and the electrode assembly 5, the first insulating members 7 comprise cavities which are open towards the main body 52, and the lugs 51 are accommodated in the cavities; the second insulating member 8 is disposed at a side of the electrode assembly 5 facing away from the cap plate assembly 6 in the second direction Y, and the second insulating member 8 includes at least one insulating portion 81, and the insulating portion 81 is disposed between the case 4 and the tab 51.

In the scheme of the embodiment of the application, the battery unit 3 comprises a shell 4, a cover plate assembly 6, an electrode assembly 5, a first insulating part 7 and a second insulating part 8, wherein the shell 4 comprises an opening, the cover plate assembly 6 covers the opening to form a cavity for accommodating the electrode assembly 5, the electrode assembly 5 is arranged in the shell 4, the lugs 51 are respectively arranged at two ends of the electrode assembly 5 in a first direction X, the cover plate assembly 6 is positioned at one side of the electrode assembly 5 in a second direction Y, two first insulating parts 7 are respectively arranged at two sides of the electrode assembly 5 in the first direction X, part of the first insulating parts 7 are arranged between the cover plate assembly 6 and the electrode assembly 5 so as to improve the insulating effect of the cover plate assembly 6 and the electrode assembly 5 through the first insulating parts 7, the first insulating parts 7 comprise cavities which are opened towards the main body 52, and the lugs 51 are accommodated in the cavities so as to insulate the lugs 51 through the first insulating parts 7 and the inner wall of the shell 4; the second insulating member 8 is disposed on one side of the electrode assembly 5, which faces away from the cover plate assembly 6 in the second direction Y, the second insulating member 8 includes at least one insulating portion 81, the insulating portion 81 is disposed between the housing 4 and the tab 51, and the insulating portion 81 of the second insulating member 8 is used to enable one end of the first insulating member 7, which faces away from the cover plate assembly 6, to be dislocated under the action of external force, so that when the tab 51 is separated from the cavity portion of the first insulating member 7, the insulating portion 81 of the second insulating member 8 can still keep insulation between the tab 51 and the bottom wall of the housing 4, thereby improving reliability of the battery cell 3.

The tabs 51 protrude from both ends of the electrode assembly 5 in the first direction X, and the tabs 51 are received in the cavities of the first insulating member 7. Specifically, the first insulating member 7 includes a first wall surface aligned with the tab 51 in the first direction X and a second wall surface wound around the first wall surface, and the first insulating member 7 separates the tab 51 from a bottom wall surface of the case 4 through the second wall surface, and the bottom wall surface of the case 4 and the opening of the case 4 are disposed opposite to each other in the second direction Y. One end of the first insulating member 7, which is close to the cover plate assembly 6, is connected with the electrode assembly 5 and/or the cover plate assembly 6, so that under the action of external force, one end of the first insulating member 7, which is away from the cover plate assembly 6, is easy to move, the tab 51 is separated from the cavity of the first insulating member 7, and the risk that the tab 51 is conducted with the inner wall surface of the bottom of the shell 4 and the tab 51 is increased.

In the embodiment of the application, therefore, the second insulating member 8 is provided at the end of the electrode assembly 5 facing away from the cap plate assembly 6, and the tab 51 is insulated from the bottom inner wall surface of the case 4 by the second insulating member 8.

The bottom wall of the shell 4 is an inner wall surface of the bottom of the shell 4, and the bottom of the shell 4 is opposite to the opening.

The electrode assembly 5 includes a main body 52 and a tab 51 extending from the main body 52, and considering that when the tab 51 is separated from the cavity of the first insulating member 7, an end of the tab 51 close to the main body 52 is exposed first, the insulating portion 81 of the second insulating member 8 should cover an end of the tab 51 close to the main body 52 first and extend toward an end of the tab 51 facing away from the main body 52. Alternatively, the projection of the tab 51 in the second direction Y is inside the insulating portion 81 of the second insulating member 8 to improve the insulation reliability of the insulating portion 81.

Optionally, the insulating portion 81 of the second insulating member 8 is made of an insulating material, and the insulating portion 81 is made of a plastic material or a silicone material.

Optionally, the shape of the insulating portion 81 is attached to a side of the tab 51 facing away from the cover assembly 6, so that the tab 51 plays a role in positioning the insulating portion 81. Illustratively, the tab 51 is curved on a side surface facing away from the cover assembly 6, and the insulating portion 81 is a curved member protruding away from the cover assembly 6; the surface of the tab 51 facing away from the cover plate assembly 6 is planar, and the insulating portion 81 is a flat plate.

Referring to fig. 8, fig. 8 is a schematic structural diagram of a second insulating member of a battery cell according to another embodiment of the application.

In some embodiments, as shown in fig. 4, 7 and 8, the second insulating member 8 includes two insulating portions 81 disposed at intervals along the first direction X, and the second insulating member 8 further includes a connecting portion 82, the connecting portion 82 connecting the two insulating portions 81.

In these embodiments, the second insulating member 8 includes two insulating portions 81 spaced apart along the first direction X, and the second insulating member 8 further includes a connecting portion 82, where the connecting portion 82 connects the two insulating portions 81, and on one hand, the connecting portion 82 is disposed between the cell assembly and the housing 4, so as to improve the insulating effect between the cell assembly and the housing 4; on the other hand, the two insulation parts 81 are connected through the connecting part 82, so that the second insulation part 8 forms a part with a larger size, and the second insulation part 8 with the larger size is more easily grabbed and installed in the preparation process of the battery cell 3, so that the preparation efficiency is improved.

The second insulating member 8 includes a connecting portion 82, the connecting portion 82 being made of an insulating material, the connecting portion 82 being provided between the main body 52 of the electrode assembly 5 and the case 4, the connecting portion 82 having an effect of insulating the main body 52 from the bottom inner wall of the case 4.

Optionally, the connecting portion 82 and the two insulating portions 81 are integrally formed, so that processing difficulty is reduced.

Alternatively, the size of the connecting portion 82 is smaller than that of the insulating portion 81 in the thickness direction of the electrode assembly 5, reducing the material cost of the second insulating member 8, and reducing the dead weight of the battery 2; or in the thickness direction of the electrode assembly 5, the size of the connection part 82 is the same as that of the insulation part 81, and the insulation effect between the electrode assembly 5 and the bottom inner wall of the case 4 is enhanced by the insulation part 81. The connection portion 82 is, for example, in a rod shape extending in the first direction X, or in a flat plate shape extending in the first direction X, or in an arc-shaped groove shape extending in the first direction X.

Referring to fig. 9, fig. 9 is a cross-sectional view at B-B in fig. 5.

In some embodiments, as shown in fig. 4 and 9, the electrode assembly 5 includes two sidewalls 53 disposed opposite to each other in a thickness direction thereof, and an arc-shaped wall 54 connected between the two sidewalls 53, the arc-shaped wall 54 is located at an end of the electrode assembly 5 facing away from the cap assembly 6, and the arc-shaped wall 54 extends in the second direction Y and is disposed protruding away from the cap assembly 6, and the second insulating member 8 includes an accommodating space bent away from the cap assembly, and at least a portion of the arc-shaped wall 54 is accommodated in the accommodating space.

In these embodiments, the electrode assembly 5 includes two sidewalls 53 disposed opposite to each other in the thickness direction thereof, and an arc-shaped wall 54 connected between the two sidewalls 53, the arc-shaped wall 54 being located at one end of the electrode assembly 5 facing away from the cap plate assembly 6 and extending in the second direction Y and protruding away from the cap plate assembly 6, the second insulating member 8 includes a receiving space bent away from the cap plate, at least a portion of the arc-shaped wall 54 being received in the receiving space, so that the receiving space of the second insulating member 8 can function as a reservoir for electrolyte to supplement the electrolyte extruded from the inside of the electrode assembly 5 during circulation, thereby facilitating electrolyte backflow; and the arc-shaped wall 54 is accommodated in the accommodation space, the arc-shaped wall 54 functioning as a positioning for the second insulating member 8.

The electrode assembly 5 is wound by using a full tab 51, and the side of the electrode assembly 5 facing away from the cover plate assembly 6 is an arc-shaped wall 54 facing away from the opening of the casing 4. The second insulating element 8 comprises a receiving space bent away from the cover plate, in which at least part of the arc-shaped wall 54 is received.

The second insulating member 8 and the first insulating member 7 are combined with the arc-shaped wall 54 of the electrode assembly 5 to form a liquid storage space that can be used to store the electrolyte, through which the electrolyte extruded by the electrode assembly 5 can flow back inside the electrode assembly 5.

The accommodation space of the second insulating member 8 comprises a bottom end and an opening end, the sectional area of the accommodation space is gradually reduced from the bottom end to the opening end, the second insulating member 8 is designed in a non-constant diameter mode, a plurality of second insulating members 8 can be stacked and fixed through the accommodation space, and stacking and transportation of the second insulating members 8 are facilitated.

In other embodiments, the electrode assembly 5 is in a full tab 51 lamination design, the side of the electrode assembly 5 facing away from the cover plate assembly 6 is planar, and the second insulating member 8 is planar.

In some embodiments, as shown in fig. 4 and 9, along the second direction Y, the sidewall 53 is located between the cover plate assembly 6 and the second insulator 8.

In these embodiments, the side wall 53 is located between the cover assembly 6 and the second insulating member 8 along the second direction Y, the second insulating member 8 is spaced from the side wall 53 of the electrode assembly 5, and the second insulating member 8 does not increase the overall thickness of the battery cell 3, and the side wall 53 of the electrode assembly 5 is not subjected to stress concentration and damage caused by the second insulating member 8 abutting against the side wall 53 of the electrode assembly 5.

The side wall 53 is located between the cap assembly 6 and the second insulating member 8 in the second direction Y, i.e., the end of the second insulating member 8 facing the cap assembly 6 does not extend across the arc-shaped wall 54 of the electrode assembly 5 in the second direction Y. Specifically, the dimension of the portion of the side wall 53 is equal to or greater than the dimension of the portion of the arc-shaped wall 54 in the thickness direction of the electrode assembly 5, and therefore, only the second insulating member 8 is provided to the portion of the arc-shaped wall 54, so that the electrode assembly 5 does not increase in the overall thickness of the electrode assembly 5 due to the provision of the second insulating member 8.

Optionally, after the second insulating member 8 is mounted on the electrode assembly 5, the dimension of the maximum thickness of the second insulating member 8 along the electrode assembly 5 is smaller than or equal to the dimension of the two side walls 53 of the electrode assembly 5.

In some embodiments, as shown in FIGS. 4 and 9, the two side walls 53 are spaced apart by a distance D in the thickness direction thereof, and the height H of the second insulating member 8 in the second direction Y is satisfied, H.ltoreq.D/2.

In these embodiments, when the distance between the two side walls 53 in the thickness direction thereof and the height of the second insulating member 8 in the second direction Y satisfy the above-described relationship, the second insulating member 8 and the side walls 53 do not interfere with each other to improve the problem that the second insulating member 8 bulges against the side walls 53 of the electrode assembly 5 in the thickness direction of the electrode assembly 5, and the second insulating member 8 causes an increase in the thickness of the battery cell 3.

Specifically, the arc-shaped wall 54 is semicircular, and the arc-shaped wall 54 of the electrode assembly 5 has a semicircular radius in the second direction Y, that is, half D/2 of the distance between the side walls 53 of the electrode assembly 5, so that the second insulating member 8 can be spaced apart from the side walls 53 when the height H of the second insulating member 8 in the second direction Y is equal to or less than D/2.

Referring to fig. 10, fig. 10 is a schematic structural view of a second insulating member of a battery cell according to another embodiment of the application.

In some embodiments, as shown in fig. 4 and 10, the second insulating member 8 further includes an end wall 83, the end wall 83 being connected to an end of the insulating portion 81 in the first direction X, the end wall 83 and the tab 51 being aligned in the first direction X.

In these embodiments, the second insulating member 8 further includes an end wall 83, the end wall 83 is connected to an end portion of the insulating portion 81 in the first direction X, the end wall 83 and the tab 51 are aligned along the first direction X, so that the tab 51 can perform a positioning function on the second insulating member 8 through the end wall 83, and since the edge of the tab 51 is relatively sharp, the end wall 83 and the tab 51 are aligned to reduce the risk of the tab 51 penetrating the first insulating member 7 and/or the second insulating member 8, resulting in conduction between the tab 51 and the inner wall of the case 4 of the battery 2.

The end wall 83 is connected to an end of the insulating portion 81 in the first direction X, specifically, an end connected to an end of the insulating portion 81 facing away from the connecting portion 82, the end extending toward the cover assembly 6 in the second direction Y, the end wall 83 and the tab 51 being aligned in the first direction X, the tab 51 serving to fix and position the second insulating member 8 through the end wall 83.

The shape of the end wall 83 can be flexibly designed. Illustratively, the end wall 83 is rectangular or triangular, or the second insulating member 8 is arcuate in shape, and the end wall 83 is arcuate in shape and is connected to the arcuate edge of the insulating portion 81.

In view of the relatively sharp edges of the tab 51, the tab 51 is thus easily partially cut through the first insulating member 7 during the production and transportation of the battery cell 3, resulting in the tab 51 exposing the cavity of the first insulating member 7. An end wall 83 is therefore provided at the end of the second insulating member 8, by which end wall 83 the structural strength of the first insulating member 7 and the second insulating member 8 of the tab 51 portion is enhanced, reducing the risk of the end wall 83 exposing the first insulating member 7 and letting the insulating member pass.

Optionally, the projection of the tab 51 in the first direction X is located in the end wall 83, so as to increase the contact area between the end wall 83 and the tab 51, and improve the protection effect of the second insulating member 8 on the tab 51.

Referring to fig. 11 and 12, fig. 11 is a schematic view illustrating a part of a battery cell according to an embodiment of the application; fig. 12 is a schematic view illustrating a part of a structure of a battery cell according to another embodiment of the present application.

In some embodiments, as shown in fig. 4, 10, 11 and 12, the end wall 83 is located between the tab 51 and the first insulating member 7 in the first direction X, or the end wall 83 is disposed on a side of the first insulating member 7 facing away from the electrode assembly 5.

In these embodiments, the end wall 83 is located between the tab 51 and the first insulating member 7 in the first direction X, the tab 51 acting as a positioning for the second insulating member 8 through the end wall 83; the end wall 83 is arranged on one side of the first insulating part 7, which is away from the electrode assembly 5, and the second insulating part 8 plays a role in fixing the first insulating part 7 through the end wall 83, so that the risk that the tab 51 is separated from the first insulating part 7 under the action of external force is reduced.

As shown in fig. 11, the end wall 83 is located between the tab 51 and the first insulating member 7 in the first direction X, specifically, the second insulating member 8 is first mounted to the electrode assembly 5; next, the first insulator 7 is mounted, and the tab 51 and the end wall 83 are accommodated in the cavity of the first insulator 7.

Or as shown in fig. 12, the end wall 83 is disposed on the side of the first insulating member 7 facing away from the electrode assembly 5, specifically, the first insulating member 7 is first installed, and the tab 51 is accommodated in the cavity of the first insulating member 7; next, the second insulating member 8 is installed, and a part of the first insulating member 7 is accommodated in the accommodating space of the second insulating member 8.

The end wall 83 is located between the tab 51 and the first insulating member 7 in the first direction X, and the first insulating member 7 and the tab 51 serve to locate the second insulating member 8 through the end wall 83.

The end wall 83 is disposed on a side of the first insulating member 7 facing away from the electrode assembly 5, and the second insulating member 8 serves to fix the first insulating member 7, thereby reducing the risk of the first insulating member 7 moving under the action of external force.

Referring to fig. 13, fig. 13 is a schematic structural view of a second insulating member of a battery cell according to another embodiment of the application.

In some embodiments, as shown in fig. 4 and 13, an end of the end wall 83 facing away from the second insulator 8 in the second direction Y is connected to the first insulator 7.

In these embodiments, the end wall 83 is connected to the first insulating member 7 at an end facing away from the second insulating member 8 in the second direction Y, and the first insulating member 7 and the second insulating member 8 are fixed to each other by the end wall 83.

Specifically, the end wall 83 includes a first segment 831 and a second segment 832 aligned in the second direction Y, the first segment 831 being connected to the insulating portion 81, and the second segment 832 being connected to the first insulating member 7.

When the end wall 83 is located between the tab 51 and the first insulating member 7 in the first direction X, one end of the end wall 83 facing away from the second insulating member 8 in the second direction Y is adhesively connected to the inner surface of the first insulating member 7 facing the tab 51; when the end wall 83 is provided on the side of the first insulating member 7 facing away from the electrode assembly 5, one end of the end wall 83 facing away from the second insulating member 8 in the second direction Y is adhesively connected to the outer surface of the first insulating member 7 facing away from the tab 51.

In some embodiments, as shown in fig. 4 and 7, at least a portion of the insulating portion 81 is disposed between the first insulating member 7 and the tab 51 along the second direction Y.

In these embodiments, at least part of the insulation portion 81 is disposed between the first insulator 7 and the tab 51 along the second direction Y, and the insulation portion 81 is fixed by the first insulator 7 and the tab 51, so as to improve the problem of the insulation portion 81 moving under the action of external force.

Specifically, the partial insulating portion 81 is sandwiched between the first insulating portion 81 and the tab 51, and the first insulating portion 81 and the tab 51 serve to fix the second insulating portion 81.

In a second aspect, embodiments of the present application provide a battery comprising the battery cell of the embodiments of the first aspect.

According to the battery provided by the embodiment of the application, the battery monomer provided by any one of the embodiments is adopted, so that the same technical effects are achieved, and the details are not repeated here.

In a third aspect, an embodiment of the present application provides an electrical device, including a battery according to the embodiment of the second aspect.

The power utilization device provided by the embodiment of the application has the same technical effects due to the adoption of the battery provided by the embodiment of the application, and is not described in detail herein.

In some embodiments, as shown in fig. 1 to 13, the battery cell 3 includes a case 4, a cap plate assembly 6, an electrode assembly 5, a first insulating member 7, and a second insulating member 8, and the case 4 includes an opening; the cover plate component 6 covers the opening; the electrode assembly 5 is arranged in the shell 4, the electrode assembly 5 further comprises tabs 51 arranged at two ends of the electrode assembly 5 in the first direction X, the electrode assembly 5 comprises two side walls 53 which are oppositely arranged in the thickness direction of the electrode assembly, and an arc-shaped wall 54 connected between the two side walls 53, the arc-shaped wall 54 is positioned at one end of the electrode assembly 5, which is away from the cover plate assembly 6, the arc-shaped wall 54 extends along the second direction Y and is arranged in a protruding manner away from the cover plate assembly 6, the cover plate assembly 6 is positioned at one side of the electrode assembly 5 in the second direction Y, and the first direction X is intersected with the second direction Y; two first insulating members 7 are respectively arranged at two sides of the electrode assembly 5 in the first direction X, part of the first insulating members 7 are arranged between the cover plate assembly 6 and the electrode assembly 5, the first insulating members 7 comprise cavities which are open towards the main body 52, and the lugs 51 are accommodated in the cavities; the second insulating member 8 is disposed on one side of the electrode assembly 5 facing away from the cap plate assembly 6 in the second direction Y, the second insulating member 8 includes a connecting portion 82, two insulators disposed at intervals along an end wall 83 and a first direction X, the connecting portion 82 connects the two insulating portions 81, the insulating portions 81 are disposed between the case 4 and the tab 51, and at least part of the insulating portions 81 are disposed between the first insulating member 7 and the tab 51 in the second direction Y, the end wall 83 is connected to an end portion of the insulating portions 81 in the first direction X, the end wall 83 and the tab 51 are arranged in the first direction X, the second insulating member 8 includes a receiving space bent in the direction facing away from the cap plate, at least part of the arc-shaped wall 54 is received in the receiving space, the end wall 83 is disposed between the tab 51 and the first insulating member 7 in the first direction X, or the end wall 83 is disposed on one side of the first insulating member 7 facing away from the electrode assembly 5, one end of the end wall 83 facing away from the second insulating member 8 and the first insulating member 7 in the second direction Y is disposed between the cap plate assembly 6 and the second insulating member 8 in the second direction Y, the thickness 53 is equal to or less than or equal to the second height D2H of the thickness of the two side walls 53 in the first direction D.

In these embodiments, the battery cell 3 includes a case 4, a cap assembly 6, an electrode assembly 5, a first insulating member 7, and a second insulating member 8, the case 4 includes an opening, the cap assembly 6 is covered on the opening to form a chamber accommodating the electrode assembly 5, the electrode assembly 5 is disposed in the case 4, tabs 51 are respectively disposed at both ends of the electrode assembly 5 in a first direction X, the cap assembly 6 is disposed at one side of the electrode assembly 5 in a second direction Y, two first insulating members 7 are respectively disposed at both sides of the electrode assembly 5 in the first direction X, a portion of the first insulating member 7 is disposed between the cap assembly 6 and the electrode assembly 5 to enhance the insulating effect of the cap assembly 6 and the electrode assembly 5 by the first insulating member 7, the first insulating member 7 includes a chamber opening toward the body 52, and the tabs 51 are accommodated in the chamber to insulate the tabs 51 by the first insulating member 7 and the inner wall of the case 4; the second insulating member 8 is disposed on one side of the electrode assembly 5, which faces away from the cover plate assembly 6 in the second direction Y, the second insulating member 8 includes at least one insulating portion 81, the insulating portion 81 is disposed between the housing 4 and the tab 51, and the insulating portion 81 of the second insulating member 8 is used to enable one end of the first insulating member 7, which faces away from the cover plate assembly 6, to be dislocated under the action of external force, so that when the tab 51 is separated from the cavity portion of the first insulating member 7, the insulating portion 81 of the second insulating member 8 can still keep the tab 51 and the inner wall of the housing 4 insulated, thereby improving the reliability of the battery cell 3.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application, and are intended to be included within the scope of the appended claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims (11)

1. A battery cell, comprising:

A housing including an opening;

the cover plate component is covered on the opening;

The electrode assembly is arranged in the shell, the electrode assembly further comprises electrode lugs arranged at two ends of the first direction, the cover plate assembly is positioned at one side of the electrode assembly in the second direction, and the first direction is intersected with the second direction;

The first insulating pieces are respectively arranged on two sides of the electrode assembly in the first direction, part of the first insulating pieces are arranged between the cover plate assembly and the electrode assembly, each first insulating piece comprises a cavity which is open towards the main body, and the electrode lugs are accommodated in the cavities;

The second insulating part is arranged on one side, away from the cover plate assembly, of the electrode assembly in the second direction, and comprises at least one insulating part, and the insulating part is arranged between the shell and the lug.

2. The battery cell of claim 1, wherein the second insulator includes two insulators spaced apart in the first direction,

The second insulating piece further comprises a connecting part, and the connecting part is connected with the two insulating parts.

3. The battery cell as recited in claim 2, wherein the electrode assembly includes two sidewalls disposed opposite each other in a thickness direction thereof, and an arc-shaped wall connected between the two sidewalls, the arc-shaped wall being positioned at an end of the electrode assembly facing away from the cap assembly, and the arc-shaped wall extending in the second direction and being disposed convexly away from the cap assembly,

The second insulating piece comprises an accommodating space which is bent away from the cover plate direction, and at least part of the arc-shaped wall is accommodated in the accommodating space.

4. The battery cell of claim 3, wherein the sidewall is located between the cap assembly and the second insulator in the second direction.

5. The battery cell of claim 4, wherein the two sidewalls have a spacing D in the second direction, and the second insulator has a height H in the second direction that is equal to or less than D/2.

6. The battery cell of any one of claims 1-5, wherein the second insulator further comprises an end wall connected to an end of the insulator in the first direction, the end wall and the tab being aligned in the first direction.

7. The battery cell of claim 6, wherein the end wall is located between the tab and the first insulator in the first direction or the end wall is disposed on a side of the first insulator facing away from the electrode assembly.

8. The battery cell of claim 6, wherein an end of the end wall facing away from the second insulator in the second direction is connected to the first insulator.

9. The battery cell of claim 6, wherein at least a portion of the insulating portion is disposed between the first insulating member and the tab along the second direction.

10. A battery comprising a cell according to any one of claims 1-9.

11. An electrical device comprising a battery as claimed in claim 10.