CN220710577U - Battery cell, battery and electricity utilization device - Google Patents

Abstract

The application discloses a battery monomer, a battery and an electricity utilization device. The battery cell includes an electrode assembly including a main body portion, tabs, and a support member. The main body portion has a first end face in a first direction. The tab includes first kink and draws forth the portion, and first kink is buckled and is set up in the one end of drawing forth the portion, and the tip that draws forth the portion is kept away from to first kink sets up in first terminal surface, draws forth the portion and is used for the input and the output of electric energy. The support member is located between the first end face and the lead-out portion in the first direction, and supports the lead-out portion so that the lead-out portion and the first end face are separated from each other. The support piece comprises a second bending part and a support part, wherein the second bending part is bent and arranged at one end of the support part. The second bending part is connected with the inner side surface of the first bending part, and the supporting part is connected with the inner side surface of the leading-out part. The technical scheme provided by the application can effectively improve the reliability of the battery.

Description

Battery cell, battery and electricity utilization 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 key to sustainable development of the automobile industry, and electric vehicles become an important component of sustainable development of the automobile industry due to the energy conservation and environmental protection advantages of the electric vehicles. For electric vehicles, battery technology is an important factor in the development of the electric vehicles.

In the development of battery technology, how to improve the reliability of a battery is a technical problem that needs to be solved in battery technology.

Disclosure of Invention

The application provides a battery monomer, battery and power consumption device, the technical scheme that this application provided can improve the reliability of battery effectively.

The application is realized by the following technical scheme:

in a first aspect, some embodiments of the present application provide a battery cell including an electrode assembly including a body portion, a tab, and a support. The main body portion has a first end face in a first direction. The tab includes first kink and draws forth the portion, and first kink is buckled and is set up in the one end of drawing forth the portion, and the tip that draws forth the portion is kept away from to first kink sets up in first terminal surface, draws forth the portion and is used for the input and the output of electric energy. Along first direction, support piece is located between first terminal surface and the portion of drawing forth, and support piece supports the portion of drawing forth, and makes the portion of drawing forth and first terminal surface separate each other, and wherein, support piece includes second kink and supporting part, and the second kink is buckled and is set up in the one end of supporting part. The second bending part is connected with the inner side surface of the first bending part, and the supporting part is connected with the inner side surface of the leading-out part.

In the above-mentioned scheme, through setting up support piece between first terminal surface and portion of drawing forth, on the one hand, can play the supporting role to the portion of drawing forth, reduce the utmost point ear and receive the impact and break and cause the inside risk of breaking of battery monomer, on the other hand, can keep apart first terminal surface and portion of drawing forth effectively, reduce the portion of drawing forth and first terminal surface overlap joint and cause the risk of battery monomer internal short circuit for the battery monomer has higher reliability, and then makes the battery have higher reliability.

Meanwhile, the supporting piece can effectively form and restrain the first bending part and the leading-out part of the tab through the second bending part and the supporting part, so that the risk of internal short circuit of the battery cell caused by overlap joint of the tab redundancy and the first end face is reduced; on the other hand, can play the supporting role to drawing forth portion effectively, reduce the risk that the tab fracture led to the inside circuit breaking of battery monomer for the battery has higher reliability, and then makes the battery have higher reliability.

According to some embodiments of the application, the support is a metal piece and is sheet-shaped.

According to the scheme, the supporting piece is arranged to be the sheet-shaped metal piece, on one hand, the shape of the lug can be restrained by utilizing the rigidity and strength of the metal piece, the deformation risk of the lug is reduced, the lug is in a stable posture, the risk of internal short circuit of a battery cell caused by overlap joint of the lug and the pole piece is reduced, and meanwhile, the lithium precipitation risk caused by increase of a gap between the pole piece and the pole piece due to redundancy of the lug is reduced; on the other hand, the lug can be effectively supported and restrained, the problem that the lug is broken to cause the internal fracture of the battery monomer is solved, the battery has higher reliability, and the battery has higher reliability.

According to some embodiments of the present application, the support portion is welded to the lead-out portion.

In the above-mentioned scheme, through welded mode connection supporting part and portion of drawing forth, on the one hand reduce the connection degree of difficulty of support piece and utmost point ear, improve assembly efficiency, on the other hand for have good joint strength between portion of drawing forth and the supporting part for the supporting part can support and retrain the gesture of drawing forth the portion effectively, reduces the risk of drawing forth the portion and warp, thereby reduces the risk of the inside circuit breaking of battery monomer and short circuit, makes the battery have higher reliability, and then makes the battery have higher reliability.

According to some embodiments of the present application, the tab includes a plurality of sub-tabs arranged in a stack; the thickness of the supporting piece is larger than that of the sub-tab.

In the scheme, the thickness of the supporting piece is limited to be larger than that of the sub-tabs, so that the supporting piece has larger rigidity, the tabs can be effectively supported and restrained, the risk of tab deformation is reduced, the risks of open circuit and short circuit in the battery cell are reduced, the battery has higher reliability, and the battery has higher reliability.

According to some embodiments of the present application, the thickness of the support member is T1, and the thickness of the sub-tab is T2, so that 10×t2+.t1+.20t2 is satisfied.

In the scheme, when the thickness of the supporting piece is not smaller than 10 times of the thickness of the tab, the tab can be effectively restrained and supported, the deformation of the tab is restrained, the risks of open circuit and short circuit in the battery cell are reduced, and the battery cell has higher reliability; when the thickness of the supporting piece is not more than 20 times of the thickness of the tab, the space occupation of the supporting piece and the influence on the weight of the battery cell can be reduced, and the battery cell can have higher energy density; for this reason, by limiting the thickness of the support to 10×t2+.t1+.20t2, both the reliability and the energy density of the battery cell can be achieved.

According to some embodiments of the present application, 12×t2+.t1+.15×t2 is satisfied.

In the scheme, when the thickness of the supporting piece is not smaller than the thickness of the 12 times of the lug, the lug can be further restrained and supported, the deformation of the lug is restrained, the risks of open circuit and short circuit in the battery cell are reduced, and the battery cell has higher reliability; when the thickness of the supporting piece is not more than 15 times of the thickness of the tab, the occupation of the supporting piece on the space and the influence on the weight of the battery cell can be further reduced, and the battery cell can have higher energy density; for this reason, by limiting the thickness of the support to 12×t2+.t1+.15×t2, both the reliability and the energy density of the battery cell can be further compromised.

According to some embodiments of the present application, the thickness of the support is T1, satisfying 0.1 mm.ltoreq.T1.ltoreq.0.2 mm.

In the scheme, when the thickness of the supporting piece is not smaller than 0.1mm, the lug can be restrained and supported, the deformation of the lug is restrained, the risks of open circuit and short circuit in the battery cell are reduced, and the battery cell has higher reliability; when the thickness of the supporting piece is not more than 0.2mm, the occupation of the supporting piece on the space and the influence on the weight of the battery cell can be further reduced, and the battery cell can have higher energy density; for this reason, by limiting the thickness of the support to 0.1 mm.ltoreq.t1.ltoreq.0.2 mm, both the reliability and the energy density of the battery cell can be achieved.

According to some embodiments of the application, the length of the support in the unfolded state is L, and L is more than or equal to 20mm and less than or equal to 30mm; and/or the width of the support piece is W in the unfolded state, so that W is more than or equal to 30mm and less than or equal to 40mm.

In the above scheme, in some embodiments, when the length of the supporting piece is not less than 20mm, the length of the supporting piece corresponds to the length of the tab, so that the tab can be restrained and supported, the deformation of the tab is restrained, the risks of open circuit and short circuit in the battery cell are reduced, and the battery cell has higher reliability; when the length of the support piece is not more than 30mm, the space occupation of the support piece and the influence on the weight of the battery monomer can be further reduced, the battery monomer can have higher energy density, and the risk of overlapping the support piece and the pole piece is reduced; for this reason, by limiting the length of the support member to 20 mm.ltoreq.L.ltoreq.30 mm, both the reliability and the energy density of the battery cell can be achieved.

In some embodiments, when the width of the support member is not less than 30mm, the width of the corresponding tab can restrict and support the tab, inhibit the tab from deforming, reduce the risk of open circuit and short circuit inside the battery cell, and enable the battery cell to have higher reliability; when the width of the supporting piece is not more than 40mm, the occupation of the supporting piece on the space and the influence on the weight of the battery cell can be further reduced, and the battery cell can have higher energy density; for this reason, by limiting the width of the support member to 30 mm.ltoreq.W.ltoreq.40 mm, both the reliability and the energy density of the battery cell can be achieved.

According to some embodiments of the application, along the first direction, the projection of the support portion falls into the projection of the lead-out portion.

In the above-described aspect, by providing the support portion so as not to exceed the lead-out portion, interference of the support portion with the connection interface of the lead-out portion and the electrode lead-out member can be reduced, so that the lead-out portion is reliably connected to the electrode lead-out member.

According to some embodiments of the present application, the electrode assembly further comprises an insulating member, at least a portion of which is disposed on a surface of the support member facing the first end surface.

In the scheme, the insulating piece is arranged on the inner side of the supporting piece, so that the risk of damage to the first end face caused by mutual interference between the supporting piece and the first end face can be effectively reduced; for example, when the supporting member is made of metal, the risk of internal short circuit of the battery cell caused by mutual overlapping of the supporting member and the first end surface can be reduced, so that the battery has higher reliability, and further, the battery has higher reliability.

According to some embodiments of the present application, the battery cell further comprises a housing and an electrode terminal. The electrode assembly is disposed inside the case. The electrode terminal is provided on a wall portion of the case. The other end of the lead-out part is connected with an electrode terminal.

In the scheme, the electrode assembly is arranged in the shell, so that the influence of external substances on the electrode assembly can be reduced, and the reliability of the battery cell is improved. Meanwhile, by arranging the electrode terminal on the shell and connecting the electrode terminal with the lead-out part of the tab, external charging and discharging of the battery cell can be realized.

According to some embodiments of the present application, the battery cell further includes an adapter, and the other end of the lead-out portion is connected to the electrode terminal through the adapter.

In the scheme, through the arrangement of the adapter, the connection difficulty of the leading-out part of the tab and the electrode terminal can be reduced, and the manufacturing efficiency of the battery cell is improved.

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

In a third aspect, some embodiments of the present application provide an electrical device, including a battery cell provided in any one of the embodiments of the first aspect, where the battery cell is configured to provide electrical energy.

Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic illustration of a vehicle in some embodiments of the present application;

FIG. 2 is a perspective exploded view of a battery in some embodiments of the present application;

FIG. 3 is a perspective exploded view of a battery cell according to some embodiments of the present application;

FIG. 4 is a schematic view of a partial structure of an electrode assembly according to some embodiments of the present application;

FIG. 5 is a schematic view of a support in some embodiments of the present application;

FIG. 6 is a schematic view of a support in an expanded state in accordance with some embodiments of the present application;

fig. 7 is a schematic view showing a partial structure of an electrode assembly according to other embodiments of the present application.

Icon: 100-cell; 10-battery cell; 11-an electrode assembly; 110-a body portion; 110 a-a first end face; 111-electrode lugs; 1110-a first bend; 1111-a lead-out portion; 1112-sub-tabs; 112-a support; 1120-a second bend; 1121-a support; 113-an insulator; 12-a housing; 120-a housing; 121-end caps; 13-electrode terminals; 14-an adapter; z-a first direction; 1000-vehicle; 200-a controller; 300-motor; 20-a box body; 21-a first tank portion; 22-second tank portion.

Detailed Description

Embodiments of the technical solutions 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 solutions of the present application, and thus are only examples, and are not intended to limit the scope of protection 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 herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first," "second," etc. are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases 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. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is merely an association relationship describing an association object, which means that three relationships may exist, for example, a and/or B may mean: there are three cases, a, B, a and B simultaneously. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), and similarly, "plural sets" refers to two or more (including two), and "plural sheets" refers to two or more (including two).

In the description of the embodiments of the present application, the orientation or positional relationship indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of describing the embodiments of the present application and for simplifying the description, rather than indicating or implying that the apparatus or element 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.

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 the specific circumstances.

In the present application, the battery cell may include a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, which is not limited by the embodiment of the present application. The battery cell may be in a rectangular parallelepiped or other shape, etc., and the embodiments of the present application are not limited thereto. Reference to a battery in embodiments of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. 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 consists of a positive electrode plate, a negative electrode plate and a diaphragm. The battery cells operate primarily by virtue of metal ions moving (e.g., de-intercalation) between the positive and negative electrode sheets. The positive electrode plate comprises a positive electrode current collector and a positive electrode active material layer, wherein the positive electrode active material layer is coated on the surface of the positive electrode current collector, the positive electrode current collector without the positive electrode active material layer protrudes out of the positive electrode current collector coated with the positive electrode active material layer, and the positive electrode current collector without the positive electrode active material layer is used as a positive electrode lug. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, 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, wherein the negative electrode active material layer is coated on the surface of the negative electrode current collector, the negative electrode current collector without the negative electrode active material layer protrudes out of the negative electrode current collector coated with the negative electrode active material layer, and the negative electrode current collector without the negative electrode active material layer is used as a negative electrode lug. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the high current is passed without fusing, the number of positive tabs is plural and stacked together, and the number of negative tabs is plural and stacked together. The material of the separator may be PP (polypropylene) or PE (polyethylene). In addition, the electrode assembly may be a wound structure or a lamination structure, and the embodiment of the present application is not limited thereto. In some embodiments, in the process of manufacturing the electrode assembly, a tab folding process is generally performed, that is, the tab is folded toward the end surface of the electrode assembly to improve the utilization rate of the electrode assembly, so that the battery cell has a higher volumetric energy density.

The development of battery technology is taking into consideration various design factors such as energy density, cycle life, discharge capacity, charge-discharge rate and other performance parameters, and the reliability of the battery. At present, in order to improve the volume energy density of the battery, the tab is bent in the manufacturing process of the battery, namely, the tab bending process is performed; however, the tab is deformed in the process of bending the tab, so that the tab is easily broken to cause internal short circuit of the battery cell or the tab redundancy is easily formed to overlap with the pole piece to cause internal short circuit of the battery cell, thereby affecting the reliability of the battery cell.

In view of this, some embodiments of the present application provide a battery cell including an electrode assembly including a body portion, tabs, and a support. The main body portion has a first end face in a first direction. The tab includes first kink and draws forth the portion, and first kink is buckled and is set up in the one end of drawing forth the portion, and the tip that draws forth the portion is kept away from to first kink sets up in first terminal surface, draws forth the portion and is used for the input and the output of electric energy. The support member is located between the first end face and the lead-out portion in the first direction, and supports the lead-out portion so that the lead-out portion and the first end face are separated from each other.

In the above-mentioned scheme, through setting up support piece between first terminal surface and portion of drawing forth, on the one hand, can play the supporting role to the portion of drawing forth, reduce the utmost point ear and receive the impact and break and cause the inside risk of breaking of battery monomer, on the other hand, can keep apart first terminal surface and portion of drawing forth effectively, reduce the portion of drawing forth and first terminal surface overlap joint and cause the risk of battery monomer internal short circuit for the battery monomer has higher reliability, and then makes the battery have higher reliability.

The technical scheme described in the embodiment of the application is applicable to batteries and power utilization devices using the batteries.

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 new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or an extended range automobile and the like; 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.

For convenience of explanation, the following examples will be described taking an electric device as an example of a vehicle.

FIG. 1 is a schematic illustration of a vehicle in some embodiments of the application.

The controller 200, the motor 300, and the battery 100 may be provided inside the vehicle 1000, and the controller 200 is used to control the battery 100 to supply power to the motor 300. For example, the battery 100 may be provided at the bottom or the head or tail of the vehicle 1000. Battery 100 may be used to power vehicle 1000, for example, battery 100 may be used as an operating power source for vehicle 1000, for circuitry of vehicle 1000, for example, for operating power requirements during start-up, navigation, and operation of vehicle 1000. In another embodiment of the present application, battery 100 may not only serve as an operating power source for vehicle 1000, but may also serve as a driving power source for vehicle 1000, instead of or in part instead of fuel oil or natural gas, to provide driving power for vehicle 1000.

Referring to fig. 2, fig. 2 is a perspective exploded view of battery 100 in some embodiments of the present application.

The battery 100 includes a battery cell 10 and a case 20, and the battery cell 10 is accommodated in the case 20. The case 20 is used to provide an accommodating space for the battery cell 10, and the case 20 may have various structures. In some embodiments, the case 20 may include a first case portion 21 and a second case portion 22, the first case portion 21 and the second case portion 22 being overlapped with each other, the first case portion 21 and the second case portion 22 together defining an accommodating space for accommodating the battery cell 10. The second case 22 may have a hollow structure with one end opened, the first case 21 may have a plate-like structure, and the first case 21 covers the opening side of the second case 22 so that the first case 21 and the second case 22 together define an accommodating space; the first housing portion 21 and the second housing portion 22 may each have a hollow structure with one side open, and the open side of the first housing portion 21 may be closed to the open side of the second housing portion 22. Of course, the case 20 formed by the first case portion 21 and the second case portion 22 may be of various shapes, such as a cylinder, a rectangular parallelepiped, or the like.

In the battery 100, the battery cells 10 may be one or more, and each battery cell 10 may be fixed to the case 20 by a connecting member (e.g., a bolt), or each battery cell 10 may be fixed to the case 20 by adhesion.

Referring to fig. 3 and 4, fig. 3 is a perspective exploded view of the battery cell 10 according to some embodiments of the present application, and fig. 4 is a schematic view of a partial structure of the electrode assembly 11 according to some embodiments of the present application.

The battery cell 10 includes an electrode assembly 11, and the electrode assembly 11 includes a main body portion 110, tabs 111, and a support 112. The body portion 110 has a first end face 110a in a first direction z. The tab 111 includes a first bending portion 1110 and a lead portion 1111, where the first bending portion 1110 is bent at one end of the lead portion 1111, and an end portion of the first bending portion 1110 away from the lead portion 1111 is disposed at the first end face 110a, and the lead portion 1111 is used for inputting and outputting electric energy. In the first direction z, the support 112 is located between the first end face 110a and the lead-out portion 1111, the support 112 supports the lead-out portion 1111, and separates the lead-out portion 1111 from the first end face 110a.

In some embodiments, exemplarily, referring to fig. 3, the case 12 includes a case 120 and an end cap 121, the case 120 has an opening, the electrode assembly 11 is disposed inside the case 120, and the end cap 121 is connected with the case 120 to close the opening such that the electrode assembly 11 is located in the closed space. In some embodiments, the end cap 121 may be provided with a liquid injection hole from which electrolyte may be injected into the case 120. In some embodiments, the end cap 121 may be riveted, welded, glued, or threaded to the housing 120.

In some embodiments, the housing 12 is dependent on the shape of the one or more electrode assemblies 11 (i.e., in some embodiments of the present application, the number of electrode assemblies 11 in the battery cell 10 may be one or more), for example, the housing 12 may be a hollow cuboid or a hollow cube or a hollow cylinder. In some embodiments of the present application, the housing 12 may be made of a metallic material, such as aluminum or an aluminum alloy, or the like. The housing 12 may also be made of plastic.

In some embodiments, the electrode terminal 13 is provided on the case 12, and the electrode terminal 13 is connected with the tab 111 of the electrode assembly 11 to achieve output and input of electric power. In some embodiments of the present application, the positions of the electrode terminals 13 are not limited, for example, the electrode terminals 13 with opposite polarities are disposed on the same wall portion of the housing 12 to connect the electrode tabs 111 with respective corresponding polarities, for example, the electrode terminals 13 with opposite polarities are all disposed on the end cover 121; for another example, electrode terminals 13 having opposite polarities are provided on different wall portions of the case 12 to be connected to the tabs 111 having respective corresponding polarities, for example, one electrode terminal 13 having one polarity is provided on the end cap 121 and the other electrode terminal 13 having the other polarity is provided on the bottom wall of the case 120.

The electrode assembly 11 is a component in which electrochemical reactions occur in the battery cell 10.

In some embodiments, one or more electrode assemblies 11 may be contained within the housing 12. The electrode assembly 11 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is generally provided between the positive electrode sheet and the negative electrode sheet. The portions of the positive and negative electrode tabs having the active material constitute the main body 110 of the electrode assembly 11. The portions of the positive electrode tab and the negative electrode tab that do not have active material may each constitute a sub-tab 1112.

To ensure that no fusing occurs by a large current, the number of sub-tabs 1112 is plural and stacked together to form tab 111. The positive electrode tab 111 and the negative electrode tab 111 may be located at one end of the main body 110 together or at two ends of the main body 110.

The first direction z may be the height direction of the main body 110 or the axial direction of the main body 110. The first end face 110a is an end face of the main body 110 in the first direction z.

In some embodiments of the present application, the "tab 111" is not limited to the positive tab 111 or the negative tab 111, and in some embodiments, "tab 111" may be understood as the positive tab 111, and in other embodiments, "tab 111" may be understood as the negative tab 111. Illustratively, in some embodiments of the present application, the main body 110 has a first end surface 110a in the first direction z, the positive tab 111 is disposed on the first end surface 110a, and the negative tab 111 is also disposed on the first end surface 110a. In other embodiments, the main body 110 has a first end surface 110a in the first direction z, the positive tab 111 is disposed on the first end surface 110a, and the negative tab 111 is not disposed on the first end surface 110a. In other embodiments, the main body 110 has a first end surface 110a in the first direction z, the positive tab 111 is not disposed on the first end surface 110a, and the negative tab 111 is disposed on the first end surface 110a.

The first bending portion 1110 is a part of the structure of the tab 111, and the lead portion 1111 is another part of the structure of the tab 111. One end of the first bending portion 1110 is disposed on the first end surface 110a, and the other end of the first bending portion 1110 is connected to the lead portion 1111. In some embodiments, the first bending portion 1110 is curved, the lead-out portion 1111 is straight, and a surface of the lead-out portion 1111 facing the first end surface 110a may be parallel to the first end surface 110 a. In some embodiments, the lead-out portion 1111 is spaced apart from the first end surface 110a in the first direction z, and the lead-out portion 1111 is connected to the first end surface 110a by the first bending portion 1110.

The "lead-out portion 1111 for input and output of electric energy" is understood to mean that the lead-out portion 1111 is connected to the electrode terminal 13 to achieve input and output of electric energy. In some embodiments, the lead 1111 may be connected to the electrode terminal 13 through the adapter 14.

The support 112 is a structural member disposed between the first end face 110a and the lead-out portion 1111. The support 112 functions to support the lead-out portion 1111 and to partition the lead-out portion 1111 and the first end face 110 a.

In some embodiments, the supporting member 112 has a certain rigidity, so that the inner side of the tab 111 can be disposed, and functions to shape and constrain the tab 111 and support the tab 111, for example, the supporting member 112 is made of a material having a certain rigidity, for example, a metal material, and the supporting member 112 includes two portions, which are bent to each other to correspond to the first bending portion 1110 and the lead-out portion 1111 of the tab 111, and the two portions maintain a relatively bent posture, and are not easily deformed due to the sufficient rigidity, one of the two portions may be disposed on the inner side of the first bending portion 1110, and the other portion may be disposed on the inner side of the first bending portion 1110. For example, in some embodiments, before the tab 111 folding process, the supporting member 112 and the tab 111 may be stacked, where the supporting member 112 is folded along with the tab 111, and the supporting member 112 is more rigid, so that the tab 111 is less likely to break and has a smaller redundancy probability than the tab 111, and thus can be shaped, constrained and supported.

In some embodiments, one end of the support member 112 may be disposed on the first end surface 110a, and the other end of the support member 112 may be disposed on a surface of the lead-out portion 1111 facing the first end surface 110a, for example, the support member 112 is a block structure having an insulating property, one end of which abuts against the first end surface 110a, and the other end of which abuts against the lead-out portion 1111. In some embodiments, after the tab 111 folding process, the support 112 may be placed between the lead 1111 and the first end face 110 a.

In the above-mentioned scheme, through setting up support 112 between first terminal surface 110a and draw-out portion 1111, on the one hand, can play the supporting role to draw-out portion 1111, reduce the tab 111 and receive the impact and break and cause the risk that battery cell 10 is inside open circuit, on the other hand, can keep apart first terminal surface 110a and draw-out portion 1111 effectively, reduce draw-out portion 1111 and first terminal surface 110a overlap joint and cause the risk of battery cell 10 internal short circuit for battery cell 10 has higher reliability, and then makes battery 100 have higher reliability.

Referring to fig. 4 and 5, fig. 5 is a schematic view of a support 112 according to some embodiments of the present application. The support 112 includes a second bending portion 1120 and a support portion 1121, where the second bending portion 1120 is bent at one end of the support portion 1121. The second bending portion 1120 is connected to the inner side surface of the first bending portion 1110, and the support portion 1121 is connected to the inner side surface of the lead portion 1111.

The inner side of the first bending portion 1110 may refer to a surface of the first bending portion 1110 facing the first end surface 110 a. The inner side surface of the lead-out portion 1111 may direct the surface of the lead-out portion 1111 facing the first end surface 110 a.

The second bending portion 1120 and the supporting portion 1121 are disposed to be bent with each other, and in some embodiments, a degree of bending between the second bending portion 1120 and the supporting portion 1121 may correspond to a degree of bending of the first bending portion 1110 and the lead-out portion 1111.

In some embodiments, the supporting member 112 and the tab 111 are bent in the tab 111 folding process, and the supporting member 112 may be flat or folded before being not bent, and the surface of the supporting member 112 is attached to the inner side surface of the tab 111, and the supporting member 112 and the tab 111 are stacked on each other, and at the end of the tab 111 away from the main body 110, the tab 111 and the supporting member 112 may be welded to each other, and then the supporting member 112 and the tab 111 are simultaneously bent, and the tab 111 is bent to form the first bending portion 1110 and the lead-out portion 1111, and the supporting member 112 is bent to form the supporting portion 1121 supporting the lead-out portion 1111 and the second bending portion 1120 disposed inside the first bending portion 1110.

In the above-mentioned scheme, the supporting member 112 can effectively shape and restrain the first bending portion 1110 and the lead-out portion 1111 of the tab 111 through the second bending portion 1120 and the supporting portion 1121, so as to reduce the risk of the internal short circuit of the battery cell 10 caused by the overlap joint of the tab 111 and the first end face 110a due to redundancy; on the other hand, the lead-out portion 1111 can be effectively supported, and the risk of breaking the inside of the battery cell 10 due to breakage of the tab 111 is reduced, so that the battery 100 has high reliability, and further, the battery 100 has high reliability.

According to some embodiments of the present application, the support 112 is a metal piece and is sheet-shaped.

In some embodiments, the support 112 may be made of a metallic material, for example, the material of the support 112 may be a metal such as aluminum, aluminum alloy, copper, nickel, stainless steel, and the like. In some embodiments, the support 112 may be sheet-like, for example, the support 112 may be a metal sheet.

In some embodiments, the support 112 supports the shaped and constrained tab 111, and the materials of the support 112 and the corresponding tab 111 may be the same, for example, when the tab 111 is aluminum, the support 112 may be an aluminum sheet. In other embodiments, the materials of the support 112 and the corresponding tab 111 may be different.

In the above scheme, the supporting piece 112 is set to be a sheet-shaped metal piece, on one hand, the shape of the tab 111 can be restrained by utilizing the rigidity and strength of the metal piece, so that the risk of deformation of the tab 111 is reduced, the tab 111 is in a stable posture, the risk of internal short circuit of the battery cell 10 caused by overlapping the tab 111 and the pole piece is reduced, and meanwhile, the risk of lithium precipitation caused by the increase of the gap between the pole piece and the pole piece due to redundancy of the tab 111 is reduced; on the other hand, the tab 111 can be effectively supported and restrained, the problem that the tab 111 breaks to cause the internal fracture of the battery cell 10 is solved, the battery 100 has high reliability, and the battery 100 has high reliability.

In other embodiments, the support 112 may be made of other non-metallic materials, as long as the tab 111 can be shaped, constrained, and supported.

According to some embodiments of the present application, the support portion 1121 is welded to the lead-out portion 1111.

In some embodiments, support 1121 is welded to lead 1111.

In some embodiments, the tab 111 may include a plurality of sub-tabs 1112 stacked and connected to each other by welding. When a plurality of laminated sub-tabs 1112 are welded, the support portions 1121 may be welded together.

In other embodiments, other portions of the support portion 1121 may be welded to other portions of the tab 111, such as welding other portions of the support portion 1121 to the first bent portion 1110.

In the above-mentioned scheme, through welded mode connection supporting part 1121 and portion 1111 of drawing forth, on the one hand reduce the degree of difficulty of being connected of support 112 and tab 111, improve assembly efficiency, on the other hand for draw forth and have good joint strength between portion 1111 and the supporting part 1121, make supporting part 1121 support and retrain the gesture of portion 1111 of drawing forth effectively, reduce the risk that portion 1111 warp of drawing forth, thereby reduce the risk of battery cell 10 inside circuit breaking and short circuit, make battery 100 have higher reliability, and then make battery 100 have higher reliability.

In other embodiments, the connection between the support portion 1121 and the lead-out portion 1111 may be adhesive, riveted, screw connection, or the like.

According to some embodiments of the present application, tab 111 includes a plurality of sub-tabs 1112 arranged in a stack; the thickness of the support 112 is greater than the thickness of the sub-tab 1112.

In some embodiments, the material of the support 112 may be the same as that of the sub-tab 1112, for example, the sub-tab 1112 is aluminum, and the support 112 is made of aluminum; for another example, sub-tab 1112 is made of copper and support 112 is made of copper.

It should be understood that the thickness of the supporting member 112 is greater than the thickness of the sub-tab 1112, and that the rigidity and strength of the supporting member 112 may be greater than those of the sub-tab 1112, that is, the supporting member 112 is less prone to deformation and fracture than the sub-tab 1112.

In the above-mentioned scheme, by limiting the thickness of the supporting member 112 to be greater than the thickness of the sub-tab 1112, the supporting member 112 can have greater rigidity, so as to effectively support and constrain the tab 111, reduce the risk of deformation of the tab 111, reduce the risk of internal disconnection and short circuit of the battery cell 10, and make the battery 100 have higher reliability, and further make the battery 100 have higher reliability.

In some other embodiments, the support 112 may be made of a material having a greater stiffness and strength, such that the thickness of the support 112 may be equal to or less than the thickness of the sub-tab 1112.

Referring to fig. 5, fig. 5 illustrates support 112 and sub-tabs 1112, according to some embodiments of the present application. The thickness of the supporting piece 112 is T1, and the thickness of the sub-tab 1112 is T2, so that T2 is 10×t2 is less than or equal to T1 and less than or equal to 20×t2.

In some embodiments, the thickness of the support 112 relative to the sub-tab 1112 is defined, for example, the thickness T1 of the support 112 is defined to be no less than 10 times the thickness T2 of the sub-tab 1112 and no greater than 20 times the thickness T2 of the sub-tab 1112.

In some embodiments, the thickness T1 of the support member 112 may be 10×t2, 11×t2, 12×t2, 13×t2, 14×t2, 15×t2, 16×t2, 17×t2, 18×t2, 19×t2, 20×t2 or any value between two adjacent values.

In the above scheme, when the thickness of the supporting piece 112 is not less than 10 times of the thickness of the tab 1112, the tab 111 can be effectively restrained and supported, the deformation of the tab 111 is restrained, the risk of open circuit and short circuit inside the battery cell 10 is reduced, and the battery cell 10 has higher reliability; when the thickness of the supporting member 112 is not greater than 20 times the thickness of the tab 1112, the space occupation of the supporting member 112 and the influence on the weight of the battery cell 10 can be reduced, and the battery cell 10 can have a higher energy density; for this reason, by limiting the thickness of the support 112 to 10×t2+.t1+.20t2, both the reliability and the energy density of the battery cell 10 can be achieved.

In other embodiments, the thickness of the support 112 may be less than 10 times the thickness of the tab 1112, or greater than 20 times the thickness of the tab 1112.

According to some embodiments of the present application, 12×t2+.t1+.15×t2 is satisfied.

In some embodiments, the thickness of support 112 relative to sub-tab 1112 is defined, for example, such that thickness T1 of support 112 is defined to be no less than 12 times the thickness T2 of sub-tab 1112 and no greater than 15 times the thickness T2 of sub-tab 1112.

In some embodiments, the thickness T1 of the support 112 may be 12×t2, 13×t2, 14×t2, 15×t2 or any value between two adjacent values.

In the above scheme, when the thickness of the supporting piece 112 is not less than 12 times of the thickness of the tab 1112, the tab 111 can be further constrained and supported, the deformation of the tab 111 is suppressed, and the risk of open circuit and short circuit inside the battery cell 10 is reduced, so that the battery cell 10 has higher reliability; when the thickness of the supporting member 112 is not greater than 15 times the thickness of the tab 1112, the space occupation of the supporting member 112 and the influence on the weight of the battery cell 10 can be further reduced, so that the battery cell 10 has a higher energy density; for this reason, by limiting the thickness of the support 112 to 12×t2+.t1+.15×t2, both the reliability and the energy density of the battery cell 10 can be further compromised.

According to some embodiments of the present application, the thickness of the support 112 is T1, satisfying 0.1 mm.ltoreq.T1.ltoreq.0.2 mm.

In some embodiments, the thickness T1 of the support 112 may take on the value of 0.1mm, 0.11mm, 0.12mm, 0.13mm … 0.19, 0.2mm, or any value between two adjacent values.

In the above scheme, when the thickness of the supporting piece 112 is not less than 0.1mm, the tab 111 can be restrained and supported, the deformation of the tab 111 is restrained, the risks of open circuit and short circuit inside the battery cell 10 are reduced, and the battery cell 10 has higher reliability; when the thickness of the supporting member 112 is not greater than 0.2mm, the space occupation of the supporting member 112 and the influence on the weight of the battery cell 10 can be further reduced, and the battery cell 10 can have a higher energy density; for this reason, by limiting the thickness of the support 112 to 0.1 mm.ltoreq.t1.ltoreq.0.2 mm, both the reliability and the energy density of the battery cell 10 can be achieved.

Referring to fig. 6, fig. 6 is a schematic view of the support 112 in an expanded state according to some embodiments of the present application.

In the unfolded state of the supporting piece 112, the length of the supporting piece 112 is L, and L is more than or equal to 20mm and less than or equal to 30mm. And/or, the width of the supporting piece 112 is W in the unfolded state, and the W is more than or equal to 30mm and less than or equal to 40mm.

The length direction of the support 112 may correspond to the length direction of the tab 111, and the length direction of the tab 111 may be understood as the extraction direction of the tab 111 when the tab 111 is not bent. The length of the support 112 may be the dimension of the support 112 in its length direction.

The width direction of the support 112 may correspond to the width direction of the tab 111, and the width direction of the tab 111 may be perpendicular to the length direction of the tab 111. The width of the support 112 may be the dimension of the support 112 in the width direction thereof.

In some embodiments, the length L of the support 112 may take on values of 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, or any value between two adjacent values in the deployed state of the support 112, i.e., when the support 112 is flat.

In some embodiments, the width W of the support 112 may take on a value of 30mm, 31mm, 32mm, 33mm, 34mm, 35mm, 36mm, 37mm, 38mm, 39mm, 40mm, or any value between two adjacent values in the unfolded state of the support 112, i.e., when the support 112 is flat.

In the above-mentioned solution, in some embodiments, when the length of the supporting member 112 is not less than 20mm, the length of the corresponding tab 111 can restrict and support the tab 111, inhibit the deformation of the tab 111, reduce the risk of open circuit and short circuit inside the battery cell 10, so that the battery cell 10 has higher reliability; when the length of the supporting member 112 is not greater than 30mm, the space occupation of the supporting member 112 and the influence on the weight of the battery cell 10 can be further reduced, so that the battery cell 10 has higher energy density, and the risk of overlapping the supporting member 112 with the pole piece is reduced; for this reason, by limiting the length of the support 112 to 20 mm.ltoreq.L.ltoreq.30 mm, both the reliability and the energy density of the battery cell 10 can be achieved.

In some embodiments, when the width of the supporting member 112 is not less than 30mm, corresponding to the width of the tab 111, the tab 111 can be restrained and supported, deformation of the tab 111 is inhibited, and the risk of open circuit and short circuit inside the battery cell 10 is reduced, so that the battery cell 10 has higher reliability; when the width of the supporting member 112 is not greater than 40mm, the space occupation of the supporting member 112 and the influence on the weight of the battery cell 10 can be further reduced, and the battery cell 10 can have a higher energy density; for this reason, by limiting the width of the support 112 to 30 mm+.W+.40 mm, both the reliability and the energy density of the battery cell 10 can be achieved.

According to some embodiments of the present application, referring to fig. 4, along the first direction z, the projection of the support portion 1121 falls into the projection of the lead-out portion 1111.

"the projection of the support portion 1121 falls in the projection of the lead-out portion 1111 in the first direction z" is understood to mean that the support portion 1121 is located inside the lead-out portion 1111, and the support portion 1121 may not exceed the lead-out portion 1111 in the direction perpendicular to the first direction z, or the support portion 1121 is entirely covered by the lead-out portion 1111 from the view angle in which the lead-out portion 1111 points to the support portion 1121.

In the above-described configuration, by providing the support portion 1121 so as not to protrude beyond the lead portion 1111, interference of the support portion 1121 with the connection interface between the lead portion 1111 and the electrode lead member (for example, the electrode terminal 13 or the adapter 14) can be reduced, and the lead portion 1111 can be reliably connected to the electrode lead member.

Referring to fig. 7, fig. 7 is a schematic view showing a partial structure of an electrode assembly 11 according to other embodiments of the present application.

The electrode assembly 11 further includes an insulating member 113, at least a portion of the insulating member 113 being disposed on a surface of the support member 112 facing the first end surface 110 a.

In some embodiments, the insulating member 113 may be made of an insulating material, and the insulating member 113 may be an insulating film, an insulating sheet, an insulating plate, or the like.

In some embodiments, at least a portion of the insulating member 113 may be bonded to a surface of the support member 112 facing the first end face 110 a.

In some embodiments, before the tab 111 folding process, the surface of the support member 112 is attached to the inner side surface of the tab 111, and the two are stacked on each other, at the end of the tab 111 away from the main body 110, the tab 111 and the support member 112 may be welded to each other, and the insulating member 113 may be adhered to the surface of the support member 112 facing away from the tab 111, and then the tab 111 folding process is performed.

In some embodiments, the insulating member 113 may cover not only the inner side surface of the supporting member 112 but also the inner side surface of the tab 111 not supported by the supporting member 112.

In the above-mentioned scheme, by providing the insulating member 113 on the inner side of the supporting member 112, the risk of the first end surface 110a being damaged due to the mutual interference between the supporting member 112 and the first end surface 110a can be effectively reduced; for example, when the supporting member 112 is made of metal, the risk of internal short circuit of the battery cell 10 caused by overlapping the supporting member 112 and the first end surface 110a can be reduced, so that the battery 100 has high reliability, and further, the battery 100 has high reliability.

Referring to fig. 3 and 4, according to some embodiments of the present application, the battery cell 10 further includes a case 12 and an electrode terminal 13. The electrode assembly 11 is disposed inside the case 12. The electrode terminal 13 is provided at a wall portion of the case 12. The other end of the lead portion 1111 is connected to the electrode terminal 13.

In some embodiments, the case 12 includes a case 120 and an end cap 121, the case 120 has an opening, the electrode assembly 11 is disposed inside the case 120, and the end cap 121 is connected with the case 120 to close the opening such that the electrode assembly 11 is located in the closed space.

The electrode terminal 13 is a structural member for power output or input, and in some embodiments, the electrode terminal 13 may have a cylindrical shape, may be mounted to the end cap 121, or may be mounted to the end cap 121 through an insulating structure.

In some embodiments, the electrode terminal 13 and the lead-out portion 1111 of the tab 111 may be directly connected or indirectly connected, for example, the electrode terminal 13 and the lead-out portion 1111 may be connected to each other by welding, caulking, or screw connection, and for example, the electrode terminal 13 may be connected to the lead-out portion 1111 by the adapter 14.

According to some embodiments of the present application, the battery cell 10 further includes an adapter 14, and the other end of the lead-out portion 1111 is connected to the electrode terminal 13 through the adapter 14.

The adapter 14 is a member provided between the electrode terminal 13 and the tab 111, and the adapter 14 can connect the lead 1111 of the tab 111 and the electrode terminal 13.

In some embodiments, the connection between the adapter 14 and the tab 111 may include welding, riveting screw connection, or other connection, and the connection between the adapter 14 and the electrode terminal 13 may include welding, riveting screw connection, or other connection.

In the above-described embodiment, the provision of the adapter 14 can reduce the difficulty in connecting the lead portion 1111 of the tab 111 and the electrode terminal 13, and can improve the manufacturing efficiency of the battery cell 10.

According to some embodiments of the present application, there is provided a battery 100, the battery 100 including the battery cell 10 described above.

In this battery 100, the electrode assembly 11 of the battery cell 10 is provided with the supporting member 112, so that, on one hand, the leading-out portion 1111 of the tab 111 can be supported, the risk that the tab 111 is broken by impact to cause the internal circuit breaking of the battery cell 10 is reduced, and on the other hand, the first end face 110a and the leading-out portion 1111 can be effectively isolated, the risk that the leading-out portion 1111 is overlapped with the first end face 110a to cause the internal circuit breaking of the battery cell 10 is reduced, so that the battery cell 10 has higher reliability, and further the battery 100 has higher reliability.

According to some embodiments of the present application, there is provided an electrical device comprising the above-described battery cell 10, the battery cell 10 being configured to provide electrical energy.

According to some embodiments of the present application, a battery cell 10 is provided, see fig. 3-6.

The battery cell 10 includes an electrode assembly 11, and the electrode assembly 11 includes a main body portion 110, tabs 111, and a support 112. The support 112 may be a metal sheet.

The body portion 110 has a first end face 110a in a first direction z. The tab 111 includes a first bending portion 1110 and a lead portion 1111, where the first bending portion 1110 is bent at one end of the lead portion 1111, and an end portion of the first bending portion 1110 away from the lead portion 1111 is disposed at the first end face 110a, and the lead portion 1111 is used for inputting and outputting electric energy. In the first direction z, the support 112 is located between the first end face 110a and the lead-out portion 1111. The support 112 includes a second bending portion 1120 and a support portion 1121, where the second bending portion 1120 is bent at one end of the support portion 1121. The second bending portion 1120 is connected to the inner side surface of the first bending portion 1110, and the support portion 1121 is connected to the inner side surface of the lead portion 1111.

In some embodiments, the supporting member 112 and the tab 111 are bent together in the tab 111 bending process, and illustratively, the supporting member 112 may be flat or bent before being not bent, the surface of the supporting member 112 is attached to the inner side surface of the tab 111, the supporting member 112 and the tab 111 are stacked on each other, the tab 111 and the supporting member 112 may be welded to each other at the end of the tab 111 far from the main body 110, then, the supporting member 112 and the tab 111 are bent to form a first bending portion 1110 and a lead-out portion 1111, and the supporting member 112 is bent to form a supporting portion 1121 supporting the lead-out portion 1111 and a second bending portion 1120 disposed inside the first bending portion 1110.

On the one hand, the supporting piece 112 can effectively form and restrain the first bending part 1110 and the leading-out part 1111 of the tab 111, so that the risk of internal short circuit of the battery cell 10 caused by overlap joint of the first end face 110a due to redundancy of the tab 111 is reduced; on the other hand, the supporting member 112 can effectively support the lead-out portion 1111, so as to reduce the risk of breaking the tab 111 to break the inside of the battery cell 10, so that the battery 100 has high reliability, and further the battery 100 has high reliability.

The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims (14)

1. A battery cell comprising an electrode assembly, the electrode assembly comprising:

a main body portion having a first end face in a first direction;

the electrode lug comprises a first bending part and a leading-out part, wherein the first bending part is bent and arranged at one end of the leading-out part, the end part of the first bending part, which is far away from the leading-out part, is arranged at the first end face, and the leading-out part is used for inputting and outputting electric energy;

the support piece is positioned between the first end face and the leading-out part along the first direction, supports the leading-out part and enables the leading-out part and the first end face to be separated from each other, wherein the support piece comprises a second bending part and a support part, and the second bending part is bent and arranged at one end of the support part; the second bending part is connected with the inner side surface of the first bending part, and the supporting part is connected with the inner side surface of the leading-out part.

2. The battery cell of claim 1, wherein the battery cell comprises a plurality of cells,

the supporting piece is a metal piece and is sheet-shaped.

3. The battery cell of claim 2, wherein the battery cell comprises a plurality of cells,

the support part is welded with the lead-out part.

4. The battery cell of claim 2, wherein the battery cell comprises a plurality of cells,

the electrode lugs comprise a plurality of sub-electrode lugs which are arranged in a stacked mode;

the thickness of the supporting piece is larger than that of the sub-tab.

5. The battery cell of claim 4, wherein the battery cell comprises a plurality of cells,

the thickness of the supporting piece is T1, the thickness of the sub-tab is T2, and the thickness is T2, wherein T2 is more than or equal to 10 and less than or equal to 20 and T2.

6. The battery cell of claim 5, wherein the battery cell comprises a plurality of cells,

it is satisfied that 12×t2 is less than or equal to t1 is less than or equal to 15×t2.

7. The battery cell of claim 2, wherein the battery cell comprises a plurality of cells,

the thickness of the supporting piece is T1, and T1 is more than or equal to 0.1mm and less than or equal to 0.2mm.

8. The battery cell of claim 1, wherein the battery cell comprises a plurality of cells,

the length of the support piece is L in the unfolded state, and L is more than or equal to 20mm and less than or equal to 30mm; and/or the number of the groups of groups,

the width of the support piece is W in the unfolding state, and the W is more than or equal to 30mm and less than or equal to 40mm.

9. The battery cell of claim 1, wherein the battery cell comprises a plurality of cells,

along the first direction, the projection of the supporting portion falls into the projection of the leading-out portion.

10. The battery cell of claim 1, wherein the battery cell comprises a plurality of cells,

The electrode assembly further includes:

and at least part of the insulating piece is arranged on the surface of the supporting piece facing the first end surface.

11. The battery cell of any one of claims 1-10, wherein the battery cell further comprises:

a case, the electrode assembly being disposed inside the case;

an electrode terminal provided to a wall portion of the case;

the other end of the lead-out part is connected with the electrode terminal.

12. The battery cell of claim 11, wherein the battery cell further comprises:

and the other end of the lead-out part is connected with the electrode terminal through the adapter.

13. A battery comprising a cell according to any one of claims 1-12.

14. An electrical device comprising a cell according to any one of claims 1-12 for providing electrical energy.