CN218997020U - 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 monomer includes electrode assembly and adapting unit, electrode assembly includes two at least electrode bodies that set up side by side along first direction and the utmost point ear that stretches out by electrode body, a plurality of electrode bodies have improved battery monomer's electric capacity, the utmost point ear includes continuous extension and kink, the extension stretches out from electrode body along the second direction, the kink is connected in the one end that the extension deviates from electrode body and extends along first direction, adapting unit is connected with the utmost point ear, adapting unit is with electrode body's electric current conduction to the external world, the utmost point ear that the kink set up has improved the structural strength of utmost point ear, the problem that the utmost point ear was impaired because of the exogenic action leads to battery internal electrical connection performance to reduce has been improved, improve battery performance.

Description

Battery monomer, battery and power consumption device

Technical Field

The present disclosure relates to battery technology, and particularly to a battery cell, 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.

Pouch-shaped batteries have been attracting attention because of their large battery capacity and high safety, but currently, the performance of pouch-shaped batteries has yet to be improved.

Disclosure of Invention

In view of the above, the present application provides a battery cell, a battery and an electric device, which can improve the problem of reduced internal electrical connection performance of the battery due to the damage of the tab, and improve the battery performance.

In a first aspect, the present application provides a battery cell comprising: the electrode assembly comprises at least two electrode main bodies and electrode lugs, wherein the at least two electrode main bodies are arranged side by side along a first direction, the electrode lugs extend out of the electrode main bodies, the electrode lugs comprise connected extension parts and bending parts, the extension parts extend out of the electrode main bodies along a second direction, the bending parts are connected to one ends of the extension parts, which are away from the electrode main bodies, and extend along the first direction, and the second direction is intersected in the first direction; the switching part comprises a connecting part and a conducting part, the connecting part extends along a first direction and is connected with at least two bending parts of the electrode assembly, the conducting part is arranged on one side of the connecting part, which is away from the tab, and extends along a second direction, and the switching part is made of a metal material.

In the scheme of the embodiment of the application, the electrode assembly comprises at least two electrode main bodies, and the capacitance of the battery cell is improved by the plurality of electrode main bodies; the electrode lug comprises an extending part and a bending part which are connected, the extending part extends out of the electrode body along the second direction, the bending part is connected to one end of the extending part, which is away from the electrode body, and extends along the first direction, the switching part is made of a metal material, the structural strength of the switching part is high, the switching part is connected with the electrode lug, the switching part conducts the current of the electrode body to the outside, the structural strength of the electrode lug is improved by the electrode lug which is arranged in a bending way, the problem that the electric connection performance inside the battery is reduced due to the damage of the electrode lug caused by the action of external force is solved, and the performance of the battery is improved.

In some embodiments, the bending portion is connected to a surface of the connecting portion facing the electrode body.

In the scheme, the bending part is connected to the surface of the connecting part, facing the electrode main body, so that the connecting part is prevented from scratching or damaging the tab, and the safety of the battery is improved.

In some embodiments, the connecting portion includes at least two sub-connecting portions along the first direction, each sub-connecting portion being connected with at least one bending portion.

In the scheme, the connecting part comprises at least two sub-connecting parts along the first direction, each sub-connecting part is connected with at least one bending part, so that current paths between each tab and the connecting part are balanced, internal resistance difference of each part is reduced, and battery performance is improved.

In some embodiments, the conductive portion is connected to a middle portion of the connection portion in the first direction, and at least two sub-connection portions are located on both sides of the conductive portion.

In the scheme, the conducting part is connected to the middle part of the connecting part along the first direction, so that the current paths from each part of the connecting part to the conducting part are balanced, the internal resistance difference of each part is reduced, and the battery performance is improved.

In some embodiments, in the second direction, the thickness of the bend is T1, the thickness of the connection is T2, and 1.ltoreq.T2/T1.ltoreq.4.

In the scheme, the thickness of the bending part is T1, the thickness of the connecting part is T2, T2/T1 is less than or equal to 4, the problems that the volume energy density of a battery is low due to the fact that too much battery inner space is occupied by the connecting part, the quality energy density of the battery is low due to the fact that too much battery inner space is occupied by the connecting part, and tabs are crushed by the connecting part due to the fact that the connecting part is too heavy are solved, meanwhile, the problem that overcurrent effect of the connecting part is poor, the battery heats seriously, and the performance of the battery is reduced are solved.

In some embodiments, further comprising: and the bracket is arranged at least one end of the electrode assembly in the first direction and sleeved on the periphery of the conducting part.

In the scheme, the support is sleeved around the conducting part, so that the strength of the conducting part area of the battery cell is enhanced, and the safety performance of the battery is improved.

In some embodiments, the stent has an aperture disposed therethrough in the second direction, the conductive portion extending from the aperture.

In the scheme, the bracket is provided with the holes penetrating along the second direction, the conducting parts extend out of the holes to conduct current generated by the electrode main bodies to the outside, and meanwhile, the holes also play a role in supporting and limiting the conducting parts.

In some embodiments, in the first direction, the aperture has a width T3 and the conductive portion has a width T4,1 < T3/T4 < 3.

In the scheme, the width of the hole is T3, the width of the conducting part is T4,1 is less than T3/T4 is less than 3, the problem that the conducting part is too narrow and is crushed or can not pass through due to the fact that the limiting effect of the hole on the conducting part is poor, the conducting part can shake under the action of external force and the performance of the battery is reduced is solved.

In some embodiments, the support comprises a top wall and a side wall connected to the peripheral side of the top wall, the top wall and the side wall enclose a containing cavity opening towards the electrode body, the connecting part is located in the containing cavity, and the hole is formed in the top wall.

In the above-mentioned scheme, the support includes the roof and connects in the lateral wall of roof week side, and roof and lateral wall enclose the synthetic chamber that holds towards electrode main part open-ended that holds, hold the chamber setting and reduced support weight. The connecting portion is located and holds the chamber, holds the chamber and plays the guard action to utmost point ear and adapting unit, improves the security performance of battery.

In some embodiments, the stent comprises: and the convex parts are arranged at two ends of the bracket along a third direction, the convex parts are protruded from the side walls towards the direction of the electrode main body and are abutted against the electrode main body, and the third direction is intersected with the first direction and the second direction.

In the scheme, the protruding part protrudes from the side wall towards the direction of the electrode main body and is abutted against the electrode main body, so that the effect of fixing the electrode main body is achieved, and the safety performance of the battery is improved.

In some embodiments, the stent further comprises: the groove is arranged at one end of the support, facing the electrode main body, along the second direction, and is used for avoiding the electrode lug.

In the above-mentioned scheme, the recess sets up in the support along the one end of second direction orientation electrode main part, and the recess is used for dodging the utmost point ear, can reduce the risk that the utmost point ear was pressed by the support and hinder.

In some embodiments, the stent comprises: the support ribs are arranged in the accommodating cavity, the plurality of support ribs are arranged at intervals along the third direction, and the plurality of support ribs are arranged on two sides of the conducting part respectively.

In the scheme, the supporting ribs are respectively arranged on two sides of the conducting part, the supporting ribs play a role in fixing the conducting part, and the problem that the performance of the battery is reduced due to shaking, bending and deformation of the conducting part under the action of external force is solved.

In some embodiments, further comprising: and a separator disposed between the bending portion and the electrode body.

In the scheme, the isolating piece is arranged between the bending part and the electrode main body, the isolating piece insulates the bending part from the electrode main body, and meanwhile, the risk of short circuit caused by inserting the electrode lugs into the electrode main body under the action of external force is reduced.

In some embodiments, at least a portion of the surface of the spacer abuts the bend.

In the scheme, at least part of the surface of the isolating piece is abutted with the bending part, the isolating piece plays a role in supporting the bending part, and the risk of short circuit caused by inserting the tab into the electrode main body due to the action of external force is further reduced.

In some embodiments, in the second direction, the projection of the connection is within the projection of the spacer.

In the scheme, the projection of the connecting part is in the projection of the isolating piece, the isolating piece plays a role in insulating the connecting part from the electrode main body, and the problem of battery short circuit caused by accidental conduction of the connecting part and the electrode main body is solved.

In some embodiments, the surface of the separator facing the electrode body is shape-fitted to and abuts against the electrode body.

In the scheme, the surface of the isolating piece facing the electrode main body is matched with the shape of the electrode main body and is mutually abutted, so that the isolating piece is not easy to fall off, and the assembly efficiency is improved.

In some embodiments, the tabs extend from both ends of the electrode body in the second direction, and the supports are disposed at both ends of the electrode assembly in the second direction.

In some embodiments, the electrode assembly includes N electrode bodies arranged in a first direction, N being an even number, and the bending portions of 2/N tabs and the bending portions of the other 2/N tabs extend toward each other.

In the above scheme, the electrode assembly comprises N electrode main bodies arranged along the first direction, N is an even number, the bending parts of 2/N electrode lugs and the bending parts of the other 2/N electrode lugs extend oppositely, the bending parts extending oppositely reduce the folding difficulty of the electrode lugs, improve the welding reliability between the bending parts and the connecting parts, and improve the battery performance.

In some embodiments, the electrode assembly further comprises a shell, the shell is a coating film, the coating film coats the outer side of the electrode assembly, an opening for the conducting part to extend out is formed in the shell, and the shell is in sealing connection with the conducting part.

In the above-mentioned scheme, the casing is the coating film, and the coating film cladding is in the electrode assembly outside, and the casing plays the effect of protection and holding electrode assembly, casing and conduction portion sealing connection have reduced the regional electrolyte extravasation's of conduction portion risk.

In some embodiments, in the first direction, the thickness of the support is T5, and the thickness of the electrode assembly is T6, 1/3.ltoreq.T5/T6.ltoreq.1.

In the scheme, the thickness of the support is T5, the thickness of the electrode assembly is T6, and T5/T6 is less than or equal to 1/3 and less than or equal to 1, so that the thickness transition of each part of the battery monomer is uniform, and the problem that the shell is pulled and broken due to overlarge thickness difference between the support and the electrode assembly is solved.

In some embodiments, the support is made of an insulating material.

In the above scheme, the support is made of an insulating material, so that the support is insulated from the electrode assembly, and the safety performance of the battery is improved.

In some embodiments, the conductive portion is for conducting electrical energy of the electrode body to the outside.

In a second aspect, embodiments of the present application provide a battery comprising a plurality of the battery cells of any of the embodiments of the first aspect.

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

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

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 pack according to an embodiment of the present application;

fig. 3 is a schematic structural view of a battery module according to an embodiment of the present application;

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

FIG. 5 is a side view of a battery cell according to one embodiment of the present application;

FIG. 6 is an enlarged schematic view of the structure at A in FIG. 5;

Fig. 7 is a schematic structural diagram of an adaptor component of a battery cell according to an embodiment of the present disclosure;

fig. 8 is an exploded view of a battery cell according to an embodiment of the present application;

fig. 9 is a front view of a stand for a battery cell according to an embodiment of the present application;

fig. 10 is a schematic structural view of a stand for a battery cell according to an embodiment of the present disclosure;

fig. 11 is a schematic structural view of a stand for a battery cell according to an embodiment of the present disclosure;

FIG. 12 is a side view of a battery cell holder according to one embodiment of the present application;

FIG. 13 is a cross-sectional view at B-B in FIG. 12;

FIG. 14 is an enlarged schematic view of the structure at A in FIG. 5;

fig. 15 is a front view of a battery cell according to an embodiment of the present application;

fig. 16 is a front view of a battery cell according to another embodiment of the present application;

fig. 17 is a schematic structural diagram of a battery cell according to an embodiment of the present disclosure;

fig. 18 is a side view of a battery cell holder according to an embodiment of the present application.

Reference numerals in the specific embodiments are as follows:

1 vehicle, 2 battery, 101 motor, 102 controller, 202 box, 2021 first box, 2022 second box, 201 battery module;

The battery comprises a battery cell, a 31 electrode assembly, a 32 switching component, a 33 electrode main body, a 34 tab, a 341 extension part, a 342 bending part, a 321 connecting part, a 322 conducting part, a 35 support, a 351 pore, a 352 accommodating cavity, a 353 top wall, 354 side walls, 355 convex parts, 356 abutting plates, 357 grooves, 36 supporting ribs, 361 accommodating grooves, 37 isolating pieces and 38 shells.

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.

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 simplifying 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, for example, be fixedly connected, detachably connected, or be integrated; 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 description of embodiments of the present application, unless explicitly 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 intermediary. 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.

In the present application, the battery cells may include lithium ion secondary battery cells, lithium ion primary battery cells, lithium sulfur battery cells, sodium lithium ion battery cells, sodium ion battery cells, or magnesium ion battery cells, and the embodiment of the present application is not limited thereto. The battery cells may be cylindrical, flat, rectangular, or otherwise shaped, as well as the embodiments herein are not limited in this regard.

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. 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.

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. And the pouch-shaped battery is paid attention to by virtue of its excellent safety performance, light weight, large capacity, and low internal resistance.

The inventors have noted that pouch cells often fail to achieve the designed performance of the battery after the battery is assembled.

In order to improve the battery performance, the applicant researches and discovers that under the action of external force, the tab of the pouch-shaped battery cell extends along the length direction, and the tab is thin, so that the external force is easy to tear, and the battery performance is reduced or fails.

Based on the above-described problems found by the inventors, the inventors have improved pouch-shaped battery cells. The inventor designs a pocket battery monomer including electrode subassembly and adapting unit, electrode subassembly includes two at least electrode main parts that set up side by side along first direction and the utmost point ear that stretches out by the electrode main part, the utmost point ear includes the extension and the kink that link to each other, the extension stretches out from the electrode main part along the second direction, the kink is connected in the extension and is kept away from the one end of electrode main part and extend along first direction, adapting unit is connected with the utmost point ear, adapting unit conducts the electric current of electrode main part to the external world, the utmost point ear that the kink set up has improved the structural strength of utmost point ear, the problem that the utmost point ear electricity connectivity performance reduces because of the exogenic action is impaired has been improved to the utmost point ear, improve battery performance.

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 present 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 present 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, providing driving power for the vehicle 1 instead of or in part instead of fuel oil or natural gas.

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 together 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 the battery module forms the battery pack again.

Fig. 2 shows a schematic structural diagram 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 structural view of a battery module 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 3, a sodium ion battery cell 3, a magnesium ion battery cell 3, or the like, which is not limited in the embodiment of the present application. The battery cell 3 may be in a cylindrical shape, a flat shape, a rectangular parallelepiped shape, or other shapes, etc., which is not limited in the embodiment of the present application. The battery cells 3 are generally divided into three types in a package manner: the battery cell of the embodiment of the application refers to a pouch-shaped battery cell, or in a series of products corresponding to the pouch-shaped battery cell.

Fig. 4 is a schematic structural diagram of a battery cell 3 according to some embodiments of the present application. The battery cell 3 refers to the smallest unit constituting the battery.

The electrode assembly 31 is a component in which electrochemical reactions occur in the battery cells 3. One or more electrode assemblies 31 may be contained in each battery cell 3. The electrode assembly 31 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 the active material constitute the electrode main body 33, and the portions of the positive electrode sheet and the negative electrode sheet having no active material constitute the tabs 34, respectively. The positive electrode tab and the negative electrode tab may be located at one end of the electrode body 33 together or at both ends of the electrode body 33 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 34 conducts current generated in the electrode assembly 31 to the outside.

Referring to fig. 5 and 6, fig. 5 is a side view of a battery cell 3 according to an embodiment of the present application, and fig. 6 is an enlarged schematic view of fig. 5 a.

As shown in fig. 5 and 6, the battery cell 3 in the embodiment of the present application includes an electrode assembly 31 and an adapter member 32, the electrode assembly 31 includes at least two electrode main bodies 33 disposed side by side along a first direction X and tabs 34 extending from the electrode main bodies 33, the tabs 34 include connected extending portions 341 and bending portions 342, the extending portions 341 extend from the electrode main bodies 33 along a second direction Y, the bending portions 342 are connected to one ends of the extending portions 341 facing away from the electrode main bodies 33 and extend along the first direction X, and the second direction Y intersects the first direction X; the adapting member 32 includes a connection portion 321 and a conductive portion 322, the connection portion 321 extends along a first direction X and is connected to at least two bending portions 342 of the electrode assembly 31, the conductive portion 322 is disposed on a side of the connection portion 321 facing away from the tab 34 and extends along a second direction Y, and the adapting member 32 is made of a metal material.

The portions of the positive electrode sheet and the negative electrode sheet having the active material constitute an electrode main body 33, and a tab 34 is connected to the electrode main body 33, the tab 34 being for guiding the current in the electrode main body 33 to the outside, the tab 34 including a plurality of tabs extending in the second direction Y, the plurality of tabs being folded together. The tab pieces folded together form the tab 34, wherein a portion of the tab 34 that still extends along the second direction Y after being folded is an extension portion 341, and another portion is called a bending portion 342. Alternatively, the arrangement of the electrode bodies 33 in the electrode assembly 31 of the battery cell 3 according to the embodiment of the present application is not limited to the arrangement along the first direction X, and a plurality of electrode bodies 33 may be arranged in an array along the first direction X and the second direction Y.

Alternatively, the tab 34 may be a positive tab or a negative tab, which is not connected to the same adapter member 32.

Optionally, in the same battery unit 3, the extension distances of each extension portion 341 in the second direction Y are the same, and the extension distances of each bending portion 341 in the first direction X are the same, so as to ensure that the current paths of the electrode main bodies 33 are similar, and improve the battery performance.

Alternatively, the connection portion 321 and the conductive portion 322 are integrally formed, or the connection portion 321 and the conductive portion 322 are welded.

Alternatively, in the first direction X, the two bending portions 342 extend in opposite directions, the surface of the bending portion 342 facing the electrode main body 33 is connected with the surface of the connecting portion 321 facing away from the electrode main body 33, so that the internal space of the battery occupied by the connecting portion 321 is reduced, and the energy density of the battery is improved.

Alternatively, the connecting portion 321 is welded to the bent portion 342, and the welding manner may be laser welding, microwave welding, friction welding, or the like.

Alternatively, the material of the connecting portion 321 is the same as that of the bending portion 342, so that the welding difficulty between the connecting portion 321 and the bending portion 342 is reduced.

In the aspects of the embodiment, the electrode assembly 31 includes at least two electrode bodies 33, and the plurality of electrode bodies 33 increases the capacity of the battery cell 3; the tab 34 includes the extension 341 and the kink 342 that link to each other, the extension 341 stretches out from the electrode main part 33 along second direction Y, the kink 342 is connected in the one end that the extension 342 deviates from the electrode main part 33 and extends along first direction X, adapting piece 32 is made by metal material, adapting piece 32 structural strength is high, adapting piece 32 is connected with the tab 34, adapting piece 32 conducts the electric current of electrode main part 33 to the external world, the structural strength of tab 34 has been improved to the tab 34 that the kink set up, the problem that the tab 34 impaired and lead to the inside electric connection performance of battery to reduce because of exogenic action has been improved, improve the battery performance.

In some embodiments, as shown in fig. 5 and 6, the bent portion 342 is connected to a surface of the connection portion 321 facing the electrode main body 33.

Optionally, corner portions of the connecting portion 321 are rounded, so that the problem that the connecting portion 321 damages the tab 34 is solved.

In these embodiments, the bending portion 342 is connected to the surface of the connecting portion 321 facing the electrode main body 33, so as to avoid the connecting portion 321 from damaging or pressing against the tab 34, thereby improving the safety of the battery.

Referring to fig. 7, fig. 7 is a schematic structural diagram of a battery cell adapting member 32 according to an embodiment of the present disclosure.

In some embodiments, as shown in fig. 6 and 7, the connection portion 321 includes at least two sub-connection portions 3211 along the first direction X, and each sub-connection portion 3211 is connected to at least one bending portion 342.

Alternatively, each of the sub-connection portions 3211 is identical in shape and size.

Alternatively, in the first direction X, two sub-connection portions 3211 are symmetrically disposed on the connection portion 321.

Alternatively, a plurality of sub-connection portions 3211 are provided at equal intervals on the connection portion 321 in the first direction X.

In these embodiments, the connection portion 321 includes at least two sub-connection portions 3211 along the first direction X, each sub-connection portion 3211 is connected to at least one bending portion 342, so as to equalize current paths between the tabs 34 and the connection portion 321, reduce internal resistance differences of the portions, and improve battery performance.

In some embodiments, as shown in fig. 7, the conductive portion 322 is connected to a middle portion of the connection portion 321 along the first direction X, and at least two sub-connection portions 3211 are located at two sides of the conductive portion 322.

The connection portion 322 is connected to a middle portion of the connection portion 321 along the first direction X, which means that the connection portion 321 is symmetrically disposed along a connection area of the connection portion 321 and the connection portion 322 in the first direction X.

Alternatively, in the first direction X, the distances from at least two sub-connection portions 3211 to the conductive portion 322 are equal.

In these embodiments, the conductive portion 322 is connected to the middle portion of the connection portion 321 along the first direction X, so as to balance the current paths from the portions of the connection portion 321 to the conductive portion 322, reduce the difference in internal resistances of the portions, and improve the battery performance.

In some embodiments, as shown in FIGS. 6 and 7, in the second direction Y, the thickness of the bent portion 342 is T1, and the thickness of the connecting portion 321 is T2, 1.ltoreq.T2/T1.ltoreq.4.

In these embodiments, the thickness of the bending portion 342 is T1, the thickness of the connecting portion 321 is T2, 1+.t2/t1+.4, which improves the problems that the connecting portion 321 is too heavy due to the too thick connecting portion 321 and occupies too much internal space of the battery, resulting in low energy density of the battery, and the connecting portion 321 damages the tab due to the crush, and meanwhile, the connecting portion 321 is too thin, resulting in poor overcurrent effect of the connecting portion 321, serious heat generation of the battery, and reduced battery performance.

Referring to fig. 8, fig. 8 is an exploded view of a battery cell 3 according to an embodiment of the present disclosure.

In some embodiments, as shown in fig. 8, the battery cell 3 further includes a support 35, and the support 35 is disposed at least one end of the electrode assembly 31 in the first direction X and is sleeved around the conductive portion 322.

Alternatively, the brackets 35 are solid cubes, and the solid cube brackets 35 are effective to enhance the strength of the conductive portion 322 area.

In these embodiments, the support 35 is sleeved around the conductive portion 322, so that the strength of the conductive portion 322 area of the battery cell 3 is enhanced, and the safety performance of the battery is improved.

Referring to fig. 9 and 10, fig. 9 is a front view of a bracket 35 of a battery cell 3 according to an embodiment of the present application, and fig. 10 is a schematic structural diagram of the bracket 35 of the battery cell 3 according to an embodiment of the present application.

In some embodiments, as shown in fig. 8-10, the bracket 35 has an aperture 351 disposed therethrough in the second direction Y, with the conductive portion 322 extending from the aperture 351.

Alternatively, in the second direction Y, the cross-sectional shape of the aperture 351 is the same as the cross-sectional shape of the conductive portion 322.

In these embodiments, the support 35 has an aperture 351 penetrating in the second direction Y, and the conductive portion 322 extends from the aperture 351 to conduct the current generated by each electrode body 33 to the outside, while the aperture 351 also plays a supporting and limiting role on the conductive portion 322.

Referring to fig. 11, 12, 13 and 14, fig. 11 is a schematic structural view of a battery cell holder 35 according to an embodiment of the present application, fig. 12 is a side view of a battery cell holder 35 according to an embodiment of the present application, fig. 13 is a cross-sectional view at B-B in fig. 12, and fig. 14 is an enlarged schematic structural view at a in fig. 5.

In some embodiments, as shown in fig. 11-14, in the first direction X, the width of the aperture 351 is T3 and the width of the conductive portion 322 is T4,1 < T3/T4 < 3.

In these embodiments, the width of the hole 351 is T3, the width of the conductive portion 322 is T4,1 < T3/T4 < 3, so that the problem that the hole 351 is too wide, resulting in poor restriction of the hole 351 to the conductive portion 322, shaking of the conductive portion 322 due to external force, and reduced battery performance is solved, and the problem that the hole 351 is too narrow, and the conductive portion 322 is crushed or the conductive portion 322 cannot pass through is also solved.

In some embodiments, as shown in fig. 11 to 14, the holder 35 includes a top wall 353 and a side wall 354 connected to a peripheral side of the top wall 353, the top wall 353 and the side wall 354 enclosing a receiving cavity 352 open toward the electrode main body 33, the connecting portion 321 being located in the receiving cavity 352, and the aperture 351 being provided in the top wall 353.

Optionally, the top wall 353 and the side walls 354 are integrally formed.

Optionally, the top wall 353 abuts against the connecting portion 321, and the bracket 35 serves to fix the connecting portion 321.

Optionally, in the second direction Y, an aperture 351 is provided through the top wall 353.

In these embodiments, the holder 35 includes a top wall 353 and a side wall 354 connected to the peripheral side of the top wall 353, the top wall 353 and the side wall 354 enclose a receiving cavity 352 open to the electrode main body 33, the receiving cavity 352 is provided with a reduced weight of the holder 35, the connecting portion 321 is located in the receiving cavity 352, the receiving cavity 352 protects the tab 34 and the adapter member 32, and the safety performance of the battery is improved.

In some embodiments, as shown in fig. 12 to 14, the holder 35 includes protruding portions 355, the protruding portions 355 being provided at both ends of the holder in a third direction Z intersecting the first direction X and the second direction Y, the protruding portions 355 protruding from the side walls 354 toward the electrode main body 33 and abutting the electrode main body 33.

Alternatively, in the third direction Z, the projections 355 at both ends of the bracket 35 are identical in shape.

Alternatively, the protrusion 355 and the sidewall 354 are integrally provided, and alternatively, the protrusion 355 and the sidewall 354 are made of the same material.

Optionally, the side of the protruding portion 355 facing the electrode main body 33 is connected with an abutting plate 356, the surface of the abutting plate 356 facing the electrode main body 33 is a plane, the abutting plate 356 abuts against the electrode main body 33, the contact area between the protruding portion 355 and the electrode main body 33 is increased, and the problems that the contact area between the protruding portion 355 and the electrode main body 33 is small, stress concentration is caused, and the electrode main body 33 is damaged are solved.

Optionally, the abutment plate 356 and the sidewall 354 are of the same material.

In these embodiments, the protruding portion 355 protrudes from the side wall 354 toward the electrode main body 33 and abuts against the electrode main body 33, and serves to fix the electrode main body 33, improving the safety performance of the battery.

In some embodiments, as shown in fig. 12 to 14, the support 35 further includes a groove 357, the groove 357 is disposed at an end of the support 35 facing the electrode body 33 along the second direction Y, and the groove 357 is configured to avoid the tab 34.

Optionally, in the second direction Y, the recess 357 is formed by the side wall 354 being concave inwardly towards the side facing away from the electrode body 33, and/or the recess 357 is formed by the side wall 354 and the projection 355.

Optionally, in the second direction Y, the depth of the groove 357 is not less than the height of the tab 34; in the third direction Z, the length of the groove 357 is not less than the length of the tab 34.

Optionally, the groove 357 abuts against a side of the bending portion 342 of the tab 34 facing away from the electrode main body 33, and the groove 357 plays a role in abutting against the tab 34.

In these embodiments, the groove 357 is disposed at one end of the support 35 facing the electrode body 33 along the second direction Y, and the groove 357 is used for avoiding the tab 34, so as to prevent the tab 34 from being crushed by the support 35.

In some embodiments, as shown in fig. 11 to 14, the bracket 35 includes support ribs 36, the support ribs 36 are disposed in the receiving cavity 352, the plurality of support ribs 36 are disposed at intervals along the third direction Z, and the plurality of support ribs 36 are disposed at both sides of the conductive portion 322.

Alternatively, the supporting ribs 36 are respectively disposed on two sides of the conductive portion 322, and the supporting ribs 36 are abutted against the conductive portion 322.

Optionally, the corners of the support ribs 36 are rounded, which improves the problem of the support ribs 36 being crushed or crushed against the conductive portion 322.

Optionally, in the second direction Y, a receiving groove 361 is disposed on a side of the support rib 36 near the electrode main body 33, where the receiving groove 361 abuts against the connecting portion 321 and receives at least part of the connecting portion 321, and the connecting portion 321 plays a role in fixing and limiting the connecting portion 321.

Alternatively, the support rib 36 is a column extending in the first direction X, and one or both ends of the support rib 36 are connected to the side wall 354 in the first direction X.

Alternatively, the ribs 36 are the same material as the sidewalls 354.

In these embodiments, the plurality of support ribs 36 are disposed on both sides of the conductive portion 322, and the support ribs 36 serve to fix the conductive portion 322, thereby improving the problem of reduced battery performance caused by shaking, bending, deformation, etc. of the conductive portion 322 due to external force.

In some embodiments, as shown in fig. 14, the battery cell further includes a separator 37, and the separator 37 is disposed between the bent portion 342 and the electrode body 33.

Optionally, the spacer 37 is an insulating material.

Alternatively, the spacer 37 is a cylinder extending along the third direction Z, and in the third direction Z, the length of the spacer 37 is the same as the length of the bent portion 342.

Optionally, the spacer 37 is bonded or clamped to the tab 34.

Alternatively, in the first direction X, when the two bending portions 342 extend in opposite directions, one spacer 37 is disposed between two adjacent tabs 34 in the first direction X; or, when the two bending parts 342 extend oppositely or extend in the same direction, one separator 37 is disposed between the bending part 342 of one tab 34 and the electrode body 33.

In these embodiments, the spacer 37 is disposed between the bending portion 342 and the electrode main body 33, and the spacer 37 insulates the bending portion 342 from the electrode main body 33, and also reduces the risk of short circuit caused by inserting the tab 34 into the electrode main body 33 under the action of external force.

In some embodiments, as shown in fig. 14, at least a portion of the surface of the spacer 37 abuts the bend 342.

In these embodiments, at least part of the surface of the spacer 37 abuts against the bent portion 342, and the spacer 37 serves to support the bent portion 342, further reducing the risk of short circuit caused by insertion of the tab 34 into the electrode body 33 due to external force.

In some embodiments, as shown in fig. 14, in the second direction Y, the projection of the connecting portion 321 is within the projection of the spacer 37.

In these embodiments, the projection of the connection portion 321 is within the projection of the separator 37, and the separator 37 serves to insulate between the connection portion 321 and the electrode main body 33, improving the problem of battery short-circuiting caused by accidental conduction between the connection portion 321 and the electrode main body 33.

In some embodiments, as shown in fig. 14, the surface of the separator 37 facing the electrode body 33 is shape-fitted and abutted against the electrode body 33.

Alternatively, the surface of the separator 37 facing away from the electrode body 33 abuts against the bent portion 342, and the surface of the separator 37 facing toward the electrode body 33 is shape-fitted to the electrode body 33 and abuts against each other.

Alternatively, in the first direction X, the bent portions 342 of two adjacent tabs 34 extend toward each other. The plurality of tabs are folded at the extending portions 341, an inclined plane is formed at the position of the extending portions 341, in the first direction X, the extending portions 341 of two adjacent tabs 34 form a V-shaped groove penetrating along the third direction Z, and the surface of the separator 37 facing the electrode main body 33 is in a V-shape with the shape of the electrode main body 33 adapted to and abutting against each other.

Alternatively, in the first direction X, the extending portions 341 and the bending portions 342 of two adjacent tabs 34 form a triangular prism-shaped space penetrating along the third direction Z, and the separator 37 is accommodated in the triangular prism-shaped space and at least fills a portion of the triangular prism-shaped space, and the separator 37 is triangular prism-shaped or pentagonal prism-shaped.

In these embodiments, the surface of the separator 37 facing the electrode main body 33 is shape-fitted and abutted against the electrode main body 33, so that the separator 37 is not easily detached, improving the assembly efficiency.

Referring to fig. 15 and 16, fig. 15 is a front view of a battery cell according to an embodiment of the present application, and fig. 16 is a front view of a battery cell according to another embodiment of the present application.

In some embodiments, as shown in fig. 14 to 16, tabs 34 protrude from both ends of the electrode body 33 in the second direction Y, and brackets 35 are provided at both ends of the electrode assembly 33 in the second direction Y.

Alternatively, the tab 34 protrudes from both ends of the electrode body 33, meaning that the positive and negative tabs protrude from both ends of the electrode body 33, respectively, in the second direction Y, and the holder 35 is provided at both ends of the electrode assembly 31.

Alternatively, in the second direction Y, the positive tab and the negative tab extend from one end of the electrode body 33, and the positive tab and the negative tab are respectively connected to one of the switching members 32, and two apertures 351 are provided in the bracket 35 for respectively extending the two switching members 32.

In these embodiments, the bracket 35 may improve the strength of the tab 34 region of the battery cell 3 and improve the safety performance of the battery.

In some embodiments, as shown in fig. 14 to 16, the electrode assembly 31 includes N electrode main bodies 33 arranged along a first direction X, N being an even number, and the bending portions 342 of 2/N tabs 34 and the bending portions 342 of the other 2/N tabs 34 extend toward each other.

In these embodiments, the electrode assembly 31 includes N electrode main bodies 33 arranged along the first direction X, N is an even number, the bending portions 342 of 2/N tabs 34 and the bending portions 342 of another 2/N tabs 34 extend toward each other, the bending portions 342 extending toward each other reduce the difficulty of folding the tabs 34, and the welding reliability between the bending portions 342 and the connection portions 321 is improved, thereby improving the battery performance.

Referring to fig. 17, fig. 17 is a schematic structural diagram of a battery cell according to an embodiment of the present disclosure.

In some embodiments, as shown in fig. 14 and 17, the battery unit 3 further includes a case 38, where the case 38 is a coating film, the coating film is coated on the outer side of the electrode assembly 31, an opening for extending the conductive portion 322 is provided on the case 38, and the case 38 is connected with the conductive portion 322 in a sealing manner.

Optionally, the surface of the conductive portion 322 is provided with an insulating layer, which is in sealing connection with the opening and serves to insulate the conductive portion 322 from the housing 38, and the insulating layer provided on the surface of the conductive portion 322 reduces the risk of accidental conduction of the conductive portion 322 and the housing 38, resulting in a short circuit of the battery.

Optionally, the coating film is an aluminum plastic film, a steel plastic film or other metal plastic films, and the coating film is coated on the outer side of the electrode assembly 31 for accommodating and protecting the electrode assembly 31.

In these embodiments, the case 38 is a coating film, the coating film is coated on the outer side of the electrode assembly 31, the case 38 serves to protect and accommodate the electrode assembly 31, and the case 38 and the conductive portion 322 are hermetically connected, so that the risk of electrolyte leakage in the region of the conductive portion 32 is reduced.

Referring to fig. 18, fig. 18 is a side view of a battery cell holder 35 according to an embodiment of the present disclosure.

In some embodiments, as shown in FIGS. 14 and 18, in the first direction X, the thickness of the support 35 is T5, and the thickness of the electrode assembly 31 is T6, 1/3.ltoreq.T5/T6.ltoreq.1.

Optionally, the corners of the support 35 are rounded to improve the problem of the corners of the support 35 scratching the housing 38.

Optionally, in the third direction Z, the length of the support 35 is similar to the length of the electrode assembly 31, so that the problem that the thicknesses of the support 35 and the electrode assembly 31 are suddenly changed too severely, resulting in the case 38 being broken by pulling is solved.

In these embodiments, where the thickness of the support 35 is T5 and the thickness of the electrode assembly 31 is T6, 1/3.ltoreq.T5/T6.ltoreq.1, the problem of the abrupt change in thickness of the support 35 and the electrode assembly 31 being too severe, resulting in the case 38 being torn by pulling, is improved.

In some embodiments, as shown in fig. 15 and 18, the bracket 35 is made of an insulating material.

Optionally, the bracket 35 material has fire protection properties.

In these embodiments, the holder 35 is made of an insulating material to insulate the holder 35 from the electrode assembly 31, improving the safety performance of the battery.

In some embodiments, as shown in fig. 14 and 18, the conductive part 322 serves to conduct the electric energy of the electrode body 33 to the outside.

In these embodiments, the conductive portion 322 serves to conduct the current generated by the electrode body 33 to the outside.

According to some embodiments of the present application, there is also provided a battery comprising the battery cell of any of the above aspects.

According to some embodiments of the present application, there is also provided an electrical device, including a battery according to the above-mentioned aspects, and the battery is used to provide electrical energy for the electrical device.

The embodiment of the application provides a battery unit, as shown in fig. 1 to 18, the battery unit 3 includes an electrode assembly 31 and a switching component 32, the electrode assembly 31 includes at least two electrode main bodies 33 disposed side by side along a first direction X and a tab 34 extending from the electrode main bodies 33, the tab 34 includes a connected extension portion 341 and a bending portion 342, the extension portion 341 extends from the electrode main body 33 along a second direction Y, the bending portion 342 is connected to one end of the extension portion 341 away from the electrode main body 33 and extends along the first direction X, the switching component 32 includes a connection portion 321 and a conductive portion 322, the connection portion 321 extends along the first direction X and is connected to at least two bending portions 342 of the electrode assembly 31, the connection portion 321 includes at least two sub-connection portions 3211 along the first direction X, each sub-connection portion 3211 is connected to at least one bending portion 342, the connection portion 321 faces the surface of the electrode main body 33, the conductive portion 322 is disposed at a middle portion of the connection portion 321 along the first direction X and extends along the second direction Y, and the thickness T1, T1 is equal to or less than or equal to 4T 1/T2 in the second direction Y.

The battery cell 3 further includes a support 35 made of an insulating material, the support 35 is disposed at least one end of the electrode assembly 31 in the first direction X, and is sleeved on the periphery of the conductive portion 322, the support 35 has a hole 351 penetrating along the second direction Y, the conductive portion 322 extends out of the hole 351, the width of the hole 351 is T3 in the first direction X, the width of the conductive portion 322 is T4, and 1 < T3/T4 < 3.

The holder 35 includes a top wall 353 and a side wall 354 connected to the peripheral side of the top wall 353, the top wall 353 and the side wall 354 enclosing a receiving chamber 352 open to the electrode main body 33, the connecting portion 321 being located in the receiving chamber 352, and the aperture 351 being provided in the top wall 353. The support 35 includes protruding portion 355, recess 357 and supporting rib 36, protruding portion 355 sets up at the both ends of support 35 along third direction Z, protruding portion 355 is protruding towards electrode main part 33 direction by lateral wall 354 and with electrode main part 33 butt, recess 357 sets up in the support 35 along second direction Y towards the one end of electrode main part 33, recess 357 is used for dodging tab 34, supporting rib 36 sets up in holding chamber 352, a plurality of supporting ribs 36 set up along third direction Z interval, and a plurality of supporting ribs 36 divide and locate the both sides of conducting portion 322.

The battery cell 3 further includes a spacer 37, the spacer 37 is disposed between the bending portion 342 and the electrode body 33, and a surface of the spacer 37 facing the electrode body 33 is shape-fitted and abutted against the electrode body 33, and in the second direction Y, the projection of the connection portion 321 is within the projection of the spacer 37.

The electrode assembly 31 includes N electrode main bodies 33 arranged along the first direction X, N is an even number, the bending portions 342 of 2/N tabs 34 and the bending portions 342 of another 2/N tabs 34 extend in opposite directions, the battery cell 3 further includes a casing 38, the casing 38 is a coating film, the coating film is coated on the outer side of the electrode assembly 31, an opening for extending the conductive portion 322 is provided on the casing 38, and the casing 38 is connected with the conductive portion 322 in a sealing manner. In the first direction X, the thickness of the support 35 is T5, and the thickness of the electrode assembly 31 is T6, 1/3.ltoreq.T5/T6.ltoreq.1.

In the battery cell 3 of the embodiment of the present application, the electrode assembly 31 includes at least two electrode bodies 33, and the plurality of electrode bodies 33 improves the electric capacity of the battery cell 3; the electrode main body 33 is provided with the tab 34, the tab 34 comprises an extending part 341 and a bending part 342 which are connected, the extending part 341 extends out of the electrode main body 33 along the second direction Y, the bending part 342 is connected with one end of the extending part 342, which is away from the electrode main body 33, and extends along the first direction X, the switching part 32 is connected with the tab 34, the switching part 32 conducts the current of the electrode main body 33 to the outside, the structural strength of the tab 34 is improved by the tab 34 which is arranged in a bending way, the problem that the internal electric connection performance of a battery is reduced due to the fact that the tab 34 is damaged due to the action of external force is solved, and the battery performance is improved.

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 present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical 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 embodiments, and are intended to be included within the scope of the 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 (24)

1. A battery cell, comprising:

the electrode assembly comprises at least two electrode main bodies and electrode lugs, wherein the electrode main bodies are arranged side by side along a first direction, the electrode lugs extend out of the electrode main bodies, the electrode lugs comprise connected extending parts and bending parts, the extending parts extend out of the electrode main bodies along a second direction, the bending parts are connected to one ends of the extending parts, which are away from the electrode main bodies, and extend along the first direction, and the second direction is intersected in the first direction;

The switching part comprises a connecting part and a conducting part, the connecting part extends along the first direction and is connected with at least two bending parts of the electrode assembly, the conducting part is arranged on one side, deviating from the lug, of the connecting part and extends along the second direction, and the switching part is made of a metal material.

2. The battery cell of claim 1, wherein the bent portion is connected to a surface of the connection portion facing the electrode body.

3. The battery cell of claim 1, wherein the connection portion includes at least two sub-connection portions along the first direction, each of the sub-connection portions being connected with at least one of the bent portions.

4. A battery cell according to claim 3, wherein the conductive portion is connected to a middle portion of the connection portion in the first direction, and at least two of the sub-connection portions are located on both sides of the conductive portion.

5. The battery cell of claim 1, wherein the thickness of the bent portion is T1 and the thickness of the connecting portion is T2, 1-T2/T1-4 in the second direction.

6. The battery cell of claim 1, further comprising:

And the bracket is arranged at least one end of the electrode assembly in the first direction and sleeved on the periphery of the conducting part.

7. The battery cell of claim 6, wherein the bracket has an aperture disposed therethrough in the second direction, the conductive portion extending from the aperture.

8. The battery cell of claim 7, wherein the aperture has a width T3 and the conductive portion has a width T4 in the first direction, 1 < T3/T4 < 3.

9. The battery cell as recited in claim 7, wherein the bracket includes a top wall and a side wall connected to a peripheral side of the top wall, the top wall and the side wall enclosing a receiving cavity open to the electrode body, the connecting portion being located in the receiving cavity, the aperture being provided in the top wall.

10. The battery cell of claim 9, wherein the bracket comprises:

and the protruding parts are arranged at two ends of the bracket along a third direction, protrude from the side walls towards the direction of the electrode main body and are abutted to the electrode main body, and the third direction is intersected with the first direction and the second direction.

11. The battery cell of claim 9, wherein the bracket further comprises:

the groove is arranged at one end of the support, which faces the electrode main body along the second direction, and the groove is used for avoiding the electrode lug.

12. The battery cell of claim 10, wherein the bracket comprises:

the support ribs are arranged in the accommodating cavity, a plurality of support ribs are arranged at intervals along the third direction, and a plurality of support ribs are arranged on two sides of the conducting part.

13. The battery cell of claim 1, further comprising:

and a separator disposed between the bending portion and the electrode body.

14. The battery cell of claim 13, wherein at least a portion of the surface of the separator abuts the bend.

15. The battery cell of claim 13, wherein a projection of the connection portion is within a projection of the separator in the second direction.

16. The battery cell of claim 14, wherein a surface of the separator facing the electrode body is shape-fitted to and in abutment with the electrode body.

17. The battery cell according to claim 6, wherein the tab protrudes from both ends of the electrode body in the second direction, and the holder is provided at both ends of the electrode assembly in the second direction.

18. The battery cell according to claim 1, wherein the electrode assembly includes N electrode bodies arranged in the first direction, N being an even number, the bent portions of 2/N of the tabs and the bent portions of the other 2/N of the tabs extending toward each other.

19. The battery cell of claim 1, further comprising:

the shell is a coating film, the coating film is coated on the outer side of the electrode assembly, an opening for the conducting part to extend out is formed in the shell, and the shell is in sealing connection with the conducting part.

20. The battery cell of claim 6, wherein the thickness of the support is T5 and the thickness of the electrode assembly is T6,1/3 ∈t5/t6 ∈1 in the first direction.

21. The battery cell of claim 6, wherein the bracket is made of an insulating material.

22. The battery cell according to any one of claims 1 to 21, wherein the conductive portion is for conducting electric energy of the electrode body to the outside.

23. A battery comprising a plurality of cells according to any one of claims 1 to 22.

24. An electrical device comprising a battery according to claim 23 for providing electrical energy.

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