CN221328042U

CN221328042U - Battery monomer, battery, electric equipment and battery monomer manufacturing equipment

Info

Publication number: CN221328042U
Application number: CN202290000376.0U
Authority: CN
Inventors: 苏华圣; 邢承友; 李全坤; 王鹏; 覃炎运; 史恺悦; 金海族
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2022-01-14
Filing date: 2022-01-14
Publication date: 2024-07-12
Anticipated expiration: 2032-01-14
Also published as: WO2023133854A1

Abstract

The embodiment of the application provides a battery monomer, a battery, electric equipment and manufacturing equipment of the battery monomer, and belongs to the technical field of batteries. The application provides a battery cell, comprising: the adapter comprises a first connecting section for connecting an electrode terminal and a second connecting section for connecting an electrode assembly, wherein the first connecting section and the second connecting section are arranged in a split mode and are connected with each other, the first connecting section is of a multi-layer structure and comprises a plurality of layers of conducting sheets which are arranged in a stacked mode, and the second connecting section is clamped between the plurality of layers of conducting sheets. The battery monomer has higher safety.

Description

Battery monomer, battery, electric equipment and battery monomer manufacturing equipment

Technical Field

The application relates to the technical field of batteries, in particular to a battery cell, a battery, electric equipment and manufacturing equipment of the battery cell.

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 addition to improving the energy density of batteries, safety is also a non-negligible problem in the development of battery technology. Therefore, how to improve the safety of the battery is a technical problem to be solved in the battery technology.

Disclosure of utility model

The application aims to provide a battery cell, a battery, electric equipment and manufacturing equipment of the battery cell. The battery monomer has higher safety.

The application is realized by the following technical scheme:

In a first aspect, the present application provides a battery cell comprising: the switching piece comprises a first connecting section for connecting an electrode terminal and a second connecting section for connecting an electrode assembly, wherein the first connecting section and the second connecting section are arranged in a split mode and are connected with each other, the first connecting section is of a multi-layer structure and comprises a plurality of layers of conducting plates which are arranged in a stacked mode, and the second connecting section is clamped between the plurality of layers of conducting plates.

According to the battery monomer provided by the embodiment of the application, the multi-layer conductive sheets are arranged in a stacked manner, the second connecting sections are clamped between the multi-layer conductive sheets, so that the multi-layer conductive sheets are respectively arranged on two sides of the second connecting sections, and compared with the situation that the multi-layer conductive sheets are connected to one side of the second connecting sections, the multi-layer conductive sheets are connected to the second connecting sections from two sides of the second connecting sections, the number of layers of the conductive sheets on each side of the second connecting sections is smaller, the connection of the multi-layer conductive sheets with the second connecting sections from two sides is facilitated, the connection difficulty of the conductive sheets with the second connecting sections is reduced, when welding is adopted, the number of layers of the conductive sheets welded on one side of the second connecting sections is smaller, the conductive sheets and the second connecting sections are prevented from being subjected to virtual welding or connection cracking, so that the conductive sheets far away from the second connecting sections are disconnected from the second connecting sections, the connection strength of the second connecting sections and the multi-layer conductive sheets is ensured, and the connection reliability of the second connecting sections and the multi-layer conductive sheets is improved, and the battery monomer is further enabled to have higher safety.

According to some embodiments of the application, the number of layers of conductive sheets on both sides of the second connection section is the same.

In the above scheme, the number of layers of the conducting strips at two sides of the second connecting section is the same, and the difficulty of connecting the conducting strips at two sides to the second connecting section is lower, so that the connection reliability of the multi-layer conducting strip and the second connecting section is ensured.

According to some embodiments of the application, the minimum thickness of the second connection section is greater than the maximum thickness of any one of the plurality of conductive sheets.

In the above scheme, the thickness of second linkage segment is greater than the thickness of arbitrary one deck conducting strip in the multilayer conducting strip, and the thickness of conducting strip promptly is thinner, is convenient for bend to reduce the installation space of adaptor, be convenient for guarantee that the battery monomer has higher energy density.

According to some embodiments of the application, the thicknesses of each of the layers of conductive sheets are equal.

In the scheme, the thicknesses of the conductive sheets in all layers are equal, so that the conductive sheets are convenient to process and manufacture, and batch production is convenient.

According to some embodiments of the application, two adjacent layers of the multi-layer conductive sheet are welded or connected by conductive glue.

In the scheme, the connection mode of welding or conductive adhesive is adopted, so that the conductivity between the multiple layers of conductive sheets can be ensured, the passing of current is ensured, and meanwhile, the connection strength can be ensured.

According to some embodiments of the application, the second connecting section is a single layer structure.

In the above scheme, the second connection section has a single-layer structure, so that the connection reliability of the second connection section and the electrode assembly is conveniently ensured.

According to some embodiments of the application, the second connection section includes a first surface facing the electrode assembly and a second surface facing away from the electrode assembly, a portion of the conductive sheet in the multilayer conductive sheet being welded to the first surface and another portion of the conductive sheet being welded to the second surface.

In the scheme, the multi-layer conductive sheet is welded with the first surface and the second surface respectively, so that the connection strength of the multi-layer conductive sheet and the second connecting section is ensured, the multi-layer conductive sheet is welded on two sides of the second connecting section, the welding difficulty of the multi-layer conductive sheet and the second connecting section is reduced, and the connection reliability of the multi-layer conductive sheet and the second connecting section is ensured.

According to some embodiments of the application, the second connecting section includes a body region and a first connecting region protruding in a direction away from the electrode assembly, the first surface and the second surface being located at the first connecting region.

In the above scheme, the first connecting region protrudes towards the direction deviating from the electrode assembly, so that a region for accommodating the conductive sheet is formed between the first connecting region and the electrode assembly, and the assembly connection of the second connecting section and the electrode assembly is not affected after the multi-layer conductive sheet is connected to the first surface and the second surface.

According to some embodiments of the application, the second connection section includes a first connection region for connection with the first connection section and two second connection regions for connection with the electrode assembly, the first connection region being located between the two second connection regions, and the multi-layered conductive sheet being connected to opposite sides of the first connection region.

In the scheme, the first connecting region is positioned between the two second connecting regions, the assembly space is reasonably distributed, the connection stress of the second connecting section and the electrode assembly is balanced, and the first connecting section and the second connecting section are stable in connection.

According to some embodiments of the application, the second connection section is directly connected with the electrode assembly through the two second connection regions.

In the scheme, the second connecting section is directly connected with the electrode assembly through the second connecting area, so that current transmission is conveniently realized, and overcurrent capacity is ensured.

According to some embodiments of the application, the second connecting section is welded with the electrode assembly through the two second connecting regions.

In the scheme, the second connecting section and the electrode assembly are welded through the two second connecting areas, so that the connection stability of the second connecting section and the electrode assembly is ensured.

According to some embodiments of the application, the second connection section further comprises a body region, the first connection region is connected to the body region, the second connection region protrudes from a side of the body region facing the electrode assembly, a maximum thickness of the first connection region is smaller than a minimum thickness of the body region, and a maximum thickness of the first connection region is smaller than a minimum thickness of one of the two second connection regions.

In the scheme, the thickness of the first connecting area is smaller than that of the main body area and smaller than that of the second connecting area, so that the assembly height of the multi-layer conductive sheet and the second connecting section is conveniently reduced, the space occupation of the structure after the assembly of the first connecting section and the second connecting section is reduced, and the energy density of the battery monomer is improved.

According to some embodiments of the application, a surface of the first connection section adjacent to the electrode assembly is higher than a surface of the second connection section adjacent to the electrode assembly in a thickness direction of the second connection section.

In the above scheme, the surface of the first connecting section, which is close to the electrode assembly, is higher than the surface of the second connecting section, which is close to the electrode assembly, in other words, the surface of the first connecting section, which is close to the electrode assembly, is far away from the electrode assembly relative to the surface of the second connecting section, which is close to the electrode assembly, so that the first connecting section is prevented from affecting the assembly connection of the second connecting section and the electrode assembly, and the connection reliability of the second connecting section and the electrode assembly is ensured.

According to some embodiments of the application, the second connection section has a stiffness that is greater than a stiffness of the first connection section.

In the scheme, the second connecting section has higher rigidity so as to ensure the connection reliability of the second connecting section and the electrode assembly, and meanwhile, the rigidity of the first connecting section is lower, so that the difficulty in bending the first connecting section relative to the second connecting section can be reduced.

In a second aspect, the present application provides a battery comprising the battery cell of the above embodiment.

In a third aspect, the present application provides an electric device, which includes a battery unit in the foregoing embodiment, where the battery unit is used to provide electric energy.

In a fourth aspect, the present application provides a method for manufacturing a battery cell, comprising: providing an electrode terminal; providing an electrode assembly; the method comprises the steps that an adapter piece is provided, the adapter piece comprises a first connecting section and a second connecting section, the first connecting section and the second connecting section are arranged in a split mode and are connected with each other, the first connecting section is of a multi-layer structure and comprises a plurality of layers of conducting plates which are arranged in a stacked mode, the second connecting section is of a single-layer structure, and the second connecting section is clamped between the plurality of layers of conducting plates; the first connection section is connected to the electrode terminal, and the second connection section is connected to the electrode assembly.

In a fifth aspect, the present application provides an apparatus for manufacturing a battery cell, comprising: the electrode assembly comprises a providing module, a connecting piece and a connecting piece, wherein the connecting piece comprises a first connecting section and a second connecting section, the first connecting section and the second connecting section are arranged in a split mode and are connected with each other, the first connecting section is of a multi-layer structure and comprises a plurality of layers of conducting sheets which are arranged in a stacked mode, the second connecting section is of a single-layer structure, and the second connecting section is clamped between the plurality of layers of conducting sheets; an assembly module for connecting the first connection section to the electrode terminal and connecting the second connection section to the electrode assembly.

The foregoing description is only an overview of the present application, and is intended to be implemented in accordance with the teachings of the present application in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present application more readily apparent.

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 of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and other drawings may be obtained according to the drawings without inventive effort for a person skilled in the art.

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

fig. 2 is a schematic view illustrating an exploded structure of a battery according to some embodiments of the present application;

Fig. 3 is a schematic diagram illustrating an exploded structure of a battery cell according to some embodiments of the present application;

FIG. 4 is a schematic view of an adapter according to some embodiments of the present application;

FIG. 5 is a schematic view of an exploded view of an adapter according to some embodiments of the present application;

FIG. 6 is a schematic diagram illustrating an assembly of a first connecting section and a second connecting section according to some embodiments of the present application;

FIG. 7 is a top view of an adapter provided in some embodiments of the present application;

FIG. 8 is a cross-sectional view taken in the direction A-A of FIG. 7;

FIG. 9 is an enlarged view of a portion of FIG. 8 at B;

Fig. 10 is a cross-sectional view of a battery cell provided in some embodiments of the application;

FIG. 11 is a schematic diagram illustrating a bending state of an adapter according to some embodiments of the present application;

Fig. 12 is a schematic flow chart of a method of manufacturing a battery cell according to some embodiments of the application;

fig. 13 is a schematic block diagram of an apparatus for manufacturing a battery cell according to some embodiments of the present application;

In the drawings, the drawings are not drawn to scale.

Marking: 100-cell; 101-a box body; 1011-a first part; 1012-a second portion; 1-a battery cell; 11-end caps; 12-a housing; 13-an electrode assembly; 14-an adapter; 141-a first connection section; 1410-conductive sheets; 1411-a first sub-connection section; 1412-second sub-connection section; 1413-third sub-junction; 1414-a first inflection region; 1415-a second inflection region; 1416—a first bending axis; 1417—a second bending axis; 142-a second connecting section; 1421-a first surface; 1422-a second surface; 1423-body region; 1424-first connection region; 1425-a second connection region; 1426-via; 15-electrode terminals; 200-a controller; 300-motor; 1000-vehicle.

Detailed Description

Embodiments of the present application are described in further detail below with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the application and are not intended to limit the scope of the application, i.e., the application is not limited to the embodiments described.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the applications 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 of the application and the claims and the foregoing description of the drawings are intended to cover non-exclusive inclusions.

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 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.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present application, it should be understood that the terms "center," "length," "width," "thickness," "bottom," "inner," "outer," "circumferential," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not for describing a particular sequential order, and may be used to improve one or more of these features either explicitly or implicitly. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.

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 in the embodiment of the present application. The battery cell may be in a cylindrical shape, a flat shape, a rectangular parallelepiped shape, or other shapes, which is not limited in this embodiment of the application. The battery cells are generally classified into three types according to the packaging method: the cylindrical battery cell, the square battery cell and the soft package battery cell are not limited in this embodiment.

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

The battery cell comprises an electrode assembly and electrolyte, wherein the electrode assembly consists of a positive plate, a negative plate and a separation membrane. The battery cell mainly relies on metal ions to move between the positive and negative electrode plates to operate. The positive 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 current collector without the positive electrode active material layer protrudes out of the current collector coated with the positive electrode active material layer, and the 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 sheet 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 current collector without the negative electrode active material layer protrudes out of the current collector with the coated negative electrode active material layer, and the current collector without the negative electrode active material layer is used as a negative electrode tab. 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 electrode lugs is multiple and stacked together, and the number of negative electrode lugs is multiple and stacked together. The material of the separator may be PP (polypropylene) or PE (polyethylene).

The battery cell further includes an adapter for connecting the electrode assembly and the electrode terminal to conduct electric energy of the electrode assembly out through the electrode terminal, and an electrode terminal. Correspondingly, the electrode terminal connected with the positive electrode tab is a positive electrode terminal, and the electrode terminal connected with the negative electrode tab is a negative electrode terminal. In order to facilitate the assembly of the battery cells and save the occupied space of the adapter, the adapter is generally bent to reduce the assembly height.

The development of battery technology is taking into consideration various design factors such as energy density, discharge capacity, charge-discharge rate and other performance parameters, and the safety of batteries.

At present, a general large cylindrical battery cell is generally formed by rubbing a lug of an electrode assembly, and after an adapter piece is welded with the lug, the adapter piece is bent to match an end cover with a shell. For the power type battery cell, the requirements of the internal resistance and the overcurrent of the battery cell are high. However, the adaptor cannot be made too thick for convenient bending and process welding, so that the flow area is small. Although the overcurrent capacity and the internal resistance are currently improved and reduced by adopting a plurality of conductive sheets connected with the electrode terminals, for example, the adapter may include a first connection section and a second connection section, the first connection section is of a multilayer structure and includes a plurality of conductive sheets arranged in a stacked manner, and the plurality of conductive sheets are connected to the second connection section, the current welding of the plurality of conductive sheets is prone to cold joint and to falling off at a welding area during use. The reason of the current cold joint is that the number of layers of the multi-layer conducting strip is more, the multi-layer conducting strip is positioned on one side of the second connecting section, and the number of layers required to be penetrated by welding is more, so that cold joint is easy to cause, even part of the conducting strip is separated from the second connecting section, and if the welding power is increased, the welding edge is cracked. The cold joint appears in the connection of multilayer conducting strip and second linkage segment, perhaps the joint margin fracture of multilayer conducting strip and second linkage segment for the connection reliability of multilayer conducting strip and second linkage segment is relatively poor, leads to the overflow ability of adaptor not enough, and the temperature rise of adaptor is too high, easily causes battery monomer thermal runaway, and then influences battery monomer security.

In view of this, in order to solve the problem of poor connection reliability of the multi-layer conductive sheet and the second connection section, the inventors have conducted intensive studies and have devised a battery cell including a first connection section for connecting electrode terminals and a second connection section for connecting electrode assemblies, the first connection section and the second connection section being separately provided and connected to each other, the first connection section being of a multi-layer structure and including multi-layer conductive sheets stacked in a layer-by-layer arrangement, the second connection section being sandwiched between the multi-layer conductive sheets, the multi-layer conductive sheets being connected to both sides of the second connection section.

Compared with the condition that the multi-layer conductive sheet is connected to one side of the second connecting section, in the battery monomer provided by the application, the multi-layer conductive sheet is arranged in a laminated manner, the second connecting section is clamped between the multi-layer conductive sheets, so that the multi-layer conductive sheets are respectively arranged on two sides of the second connecting section, the multi-layer conductive sheets are connected to the second connecting section from two sides of the second connecting section, the number of layers of the conductive sheets on each side of the second connecting section is smaller, the connection of the multi-layer conductive sheets from two sides and the second connecting section is convenient to realize, the connection difficulty between the multi-layer conductive sheets and the second connecting section is reduced, when the welding is adopted, the number of layers of the conductive sheets welded on one side of the second connecting section is smaller, the phenomenon that the conductive sheets are in cold joint or connection cracking with the second connecting section is avoided, the conductive sheets far away from the second connecting section are disconnected from the second connecting section, the connection strength of the second connecting section and the multi-layer conductive sheets is guaranteed, and the connection reliability of the second connecting section and the multi-layer conductive sheets is improved, and the battery monomer is further provided with higher safety.

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 in the embodiment of the present application.

The battery monomer disclosed by the embodiment of the application can be used in electric equipment such as vehicles, ships or aircrafts, but is not limited to the electric equipment. The power supply system of the electric equipment can be composed of the battery cells disclosed by the application.

The embodiment of the application provides electric equipment using a battery as a power supply, wherein the electric equipment can be, but is not limited to, a mobile phone, a tablet personal computer, a notebook computer, an electric toy, an electric tool, an electric bicycle, an electric motorcycle, an electric automobile, a ship, a spacecraft and the like. Among them, the electric toy may include fixed or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric plane toys, and the like, and the spacecraft may include planes, rockets, space planes, and spacecraft, and the like.

For convenience of description, the following embodiments will take an electric device according to an embodiment of the present application as an example of a vehicle.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the application. The vehicle 1000 may be a fuel oil vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or a range-extended vehicle. The battery 100 is provided in the interior of the vehicle 1000, and the battery 100 may be provided at the bottom or the head or the 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 the circuitry of vehicle 1000, such as for the operational power requirements of vehicle 1000 during start-up, navigation, and operation.

The vehicle 1000 may also include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to power the motor 300, for example, for operating power requirements during start-up, navigation, and travel of the vehicle 1000.

In some embodiments 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 an exploded view of a battery 100 according to some embodiments of the present application. The battery 100 includes a case 101 and a battery cell 1, and the battery cell 1 is accommodated in the case 101. The case 101 is used to provide an accommodating space for the battery cell 1, and the case 101 may have various structures. In some embodiments, the case 101 may include a first portion 1011 and a second portion 1012, the first portion 1011 and the second portion 1012 being overlapped with each other, the first portion 1011 and the second portion 1012 defining an accommodating space for accommodating the battery cell 1 together. The second portion 1012 may be a hollow structure with one end opened, the first portion 1011 may be a plate-shaped structure, and the first portion 1011 covers the opening side of the second portion 1012, so that the first portion 1011 and the second portion 1012 define a containing space together; the first portion 1011 and the second portion 1012 may also be hollow structures each having an opening at one side, the opening side of the first portion 1011 being engaged with the opening side of the second portion 1012.

In the battery 100, the number of the battery cells 1 may be plural, and the plurality of battery cells 1 may be connected in series, parallel, or series-parallel, where series-parallel refers to both of the plurality of battery cells 1 being connected in series and parallel. The plurality of battery cells 1 can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the plurality of battery cells 1 is accommodated in the box body 101; of course, the battery 100 may also be a battery module formed by connecting a plurality of battery cells 1 in series or parallel or series-parallel connection, and a plurality of battery modules are then connected in series or parallel or series-parallel connection to form a whole and are accommodated in the case 101. The battery 100 may further include other structures, for example, the battery 100 may further include a bus member for making electrical connection between the plurality of battery cells 1.

Wherein each battery cell 1 may be a secondary battery or a primary battery; but not limited to, lithium sulfur batteries, sodium ion batteries, or magnesium ion batteries.

Referring to fig. 3, fig. 3 is a schematic diagram illustrating an exploded structure of a battery cell 1 according to some embodiments of the present application. The battery cell 1 refers to the smallest unit constituting the battery 100. As shown in fig. 3, the battery cell 1 includes an end cap 11, a case 12, an electrode assembly 13, an adapter 14, and an electrode terminal 15.

The end cap 11 refers to a member that is covered at the opening of the case 12 to isolate the internal environment of the battery cell 1 from the external environment. Without limitation, the shape of the end cap 11 may be adapted to the shape of the housing 12 to fit the housing 12. Optionally, the end cover 11 may be made of a material (such as an aluminum alloy) with a certain hardness and strength, so that the end cover 11 is not easy to deform when being extruded and collided, so that the battery cell 1 can have higher structural strength, and the safety performance can be improved. The end cap 11 may be provided with a pressure release mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 1 reaches a threshold value. The material of the end cap 11 may be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the embodiment of the present application. In some embodiments, insulation may also be provided on the inside of the end cap 11, which may be used to isolate electrical connection components within the housing 12 from the end cap 11 to reduce the risk of short circuits. By way of example, the insulation may be plastic, rubber, or the like.

The case 12 is an assembly for cooperating with the end cap 11 to form an internal environment of the battery cell 1, wherein the formed internal environment may be used to accommodate the electrode assembly 13, the electrolyte, and other components. The case 12 and the end cap 11 may be separate members, and an opening may be provided in the case 12, and the interior of the battery cell 1 may be formed by closing the end cap 11 at the opening. It is also possible to integrate the end cap 11 and the housing 12, but specifically, the end cap 11 and the housing 12 may form a common connection surface before other components are put into the housing, and when the interior of the housing 12 needs to be sealed, the end cap 11 is then covered with the housing 12. The shape of the case 12 may be determined according to the specific shape and size of the electrode assembly 13. The material of the housing 12 may be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the embodiment of the present application.

The electrode assembly 13 is a component in which electrochemical reactions occur in the battery cell 1. One or more electrode assemblies 13 may be contained within the housing 12. The electrode assembly 13 is mainly formed by winding 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 electrode sheet and the negative electrode sheet having active materials constitute the main body of the electrode assembly 13, and the portions of the positive electrode sheet and the negative electrode sheet having no active materials constitute the tabs, respectively. The positive electrode tab and the negative electrode tab can be located at one end of the main body together or located at two ends of the main body respectively. During charge and discharge of the battery 100, the positive and negative electrode active materials react with the electrolyte, and the tab is connected to the electrode terminal 15 through the adapter 14 to form a current loop.

Electrode terminals 15 are provided on the end cap 11, and the electrode terminals 15 are electrically connected with the electrode assembly 13 through the adapter 14 for outputting or inputting electric power of the battery cell 1.

Referring to fig. 4 to 6, fig. 4 is a schematic view illustrating an unfolded state of the adaptor 14 according to some embodiments of the present application, fig. 5 is a schematic view illustrating an exploded structure of the adaptor 14 according to some embodiments of the present application, and fig. 6 is a schematic view illustrating an assembly of the first connecting section 141 and the second connecting section 142 according to some embodiments of the present application. According to some embodiments of the present application, the present application provides a battery cell 1. As shown in fig. 3 to 6, the battery cell 1 includes a switching member 14, the switching member 14 includes a first connection section 141 for connecting the electrode terminal 15 and a second connection section 142 for connecting the electrode assembly 13, the first connection section 141 and the second connection section 142 are separately provided and connected to each other, the first connection section 141 is of a multi-layered structure and includes a plurality of conductive sheets 1410 stacked one on another, and the second connection section 142 is sandwiched between the plurality of conductive sheets 1410.

The adapter 14 is a member for electrically connecting the electrode terminal 15 and the electrode assembly 13. The conductive sheet 1410 is a sheet structure having conductive characteristics, and the conductive sheet 1410 is electrically connected to the second connection section 142 to achieve transmission of electric energy. Conductive sheet 1410 may be a metal sheet (e.g., aluminum, copper, or other conductive metal) that provides good electrical conductivity to facilitate the removal of electrical energy from electrode assembly 13. Conductive sheet 1410 may also be a non-metallic conductive sheet 1410, such as a graphite sheet, a conductive ceramic sheet.

The multiple layers of conductive sheets 1410 are stacked to increase the overcurrent area through the multiple layers of conductive sheets 1410, thereby improving the overcurrent capability of the adapter 14.

The second connecting section 142 is sandwiched between the plurality of conductive sheets 1410, in other words, the plurality of conductive sheets 1410 sandwich the second connecting section 142, the plurality of conductive sheets 1410 are connected to two sides of the second connecting section 142, and the plurality of conductive sheets 1410 are connected to the second connecting section 142 at two sides of the second connecting section 142.

Compared with the situation that the multi-layer conductive sheet 1410 is connected to one side of the second connection section 142, in the battery monomer 1 of the embodiment of the application, the multi-layer conductive sheet 1410 is connected to the second connection section 142 from two sides of the second connection section 142, the number of layers of the conductive sheet 1410 at each side of the second connection section 142 is smaller, the connection difficulty between the multi-layer conductive sheet 1410 and the second connection section 142 is reduced, when welding is adopted, the number of layers of the conductive sheet 1410 welded at one side of the second connection section 142 is smaller, the occurrence of cold welding or connection cracking of the conductive sheet 1410 and the second connection section 142 can be avoided, the conductive sheet 1410 far from the second connection section 142 is separated from the second connection section 142, connection between the multi-layer conductive sheet 1410 and the second connection section 142 from two sides is facilitated, connection strength between the second connection section 142 and the multi-layer conductive sheet 1410 is ensured, connection reliability between the second connection section 142 and the multi-layer conductive sheet 1410 is improved, and the battery monomer 1 has higher safety.

According to some embodiments of the present application, the number of layers of conductive sheets 1410 on both sides of the second connection section 142 is the same.

The multiple layers of conductive sheets 1410 are respectively connected to two sides of the second connection section 142, and the number of layers of the conductive sheets 1410 located at two sides of the second connection section 142 is the same, that is, the number of layers of the conductive sheets 1410 connected to each side of the second connection section 142 is the same, in other words, the connection difficulty between the conductive sheets 1410 located at two sides of the second connection section 142 and the second connection section 142 is the same.

The number of layers of the conductive sheets 1410 at both sides of the second connection section 142 is the same, and difficulty in connecting the conductive sheets 1410 at both sides to the second connection section 142 is reduced so as to ensure connection reliability of the multi-layered conductive sheet 1410 and the second connection section 142.

According to some embodiments of the application, the minimum thickness of the second connecting segment 142 is greater than the maximum thickness of any one of the plurality of layers of conductive sheets 1410.

The minimum thickness of the second connection section 142 refers to that when the second connection section 142 has a non-uniform thickness structure, the thickness value at the minimum thickness of the second connection section 142 is the minimum thickness of the second connection section 142; when the second connecting section 142 has a constant thickness structure, the thickness value at any position of the second connecting section 142 is the maximum thickness of the second connecting section 142.

The maximum thickness of any one of the plurality of conductive sheets 1410 refers to the thickness of the region of any one of the plurality of conductive sheets 1410 where the thickness of the conductive sheet 1410 is the maximum, or the thickness of the conductive sheet 1410 where the thickness of the plurality of conductive sheets 1410 is the maximum when the thicknesses of the plurality of conductive sheets 1410 are not uniform.

The minimum thickness of the second connection section 142 is greater than the maximum thickness of any one layer of conductive sheet 1410 among the plurality of layers of conductive sheets 1410, and the thickness of the second connection section 142 is greater than the thickness of any one layer of conductive sheet 1410, so that the thickness of the conductive sheet 1410 can be thinner, the bending difficulty of the first connection section 141 is reduced, the bending of the first connection section 141 is conveniently realized, the bending height of the adapter 14 is reduced, the installation space of the adapter 14 is reduced, and the energy density of the battery cell 1 is conveniently ensured.

According to some embodiments of the application, the thicknesses of each layer of conductive sheet 1410 in the multilayer conductive sheet 1410 are equal.

The multiple layers of conductive sheets 1410 have the same thickness, which is convenient for processing and manufacturing the conductive sheets 1410, is convenient for mass production, and reduces the processing cost.

According to some embodiments of the present application, the thicknesses of the conductive sheets 1410 of the multiple layers of conductive sheets 1410 may also be different, and the multiple layers of conductive sheets 1410 are designed into conductive sheets 1410 with different thickness specifications according to different use requirements.

According to some embodiments of the present application, adjacent two layers of conductive sheets 1410 of the multi-layer conductive sheet 1410 are welded or connected by conductive glue.

The connection mode of welding or conductive adhesive is adopted, so that the conductivity between the multiple layers of conductive sheets 1410 can be ensured, the passing of current can be ensured, and meanwhile, the connection strength can be ensured. For example, the adjacent two layers of conductive sheets 1410 are laser welded, so that the adjacent two layers of conductive sheets 1410 have better connection stability, and the passing of current can be ensured.

In other embodiments of the present application, the adjacent two conductive sheets 1410 may be connected by other metal connection manners, such as riveting, bolting, etc.

According to some embodiments of the application, the second connection section 142 is of a single layer structure.

The second connection section 142 has a single-layered structure, so that connection reliability of the second connection section 142 and the electrode assembly 13 is ensured.

According to some embodiments of the present application, the second connection section 142 may have a disk shape, the size of the second connection section 142 is substantially consistent with the end surface size of the electrode assembly 13, the second connection section 142 has a larger contact area with the electrode assembly 13, and has a better overcurrent capability, and thus, the thickness of the second connection section 142 may be smaller than the minimum thickness of the multi-layered conductive sheet 1410, and the second connection section 142 does not need to be thickened or provided in a multi-layered structure.

According to some embodiments of the present application, as shown in fig. 6, the second connection section 142 includes a first surface 1421 facing the electrode assembly 13 (see fig. 3) and a second surface 1422 facing away from the electrode assembly 13, and a portion of the plurality of conductive sheets 1410 is welded to the first surface 1421 and another portion of the conductive sheets 1410 is welded to the second surface 1422.

The first surface 1421 and the second surface 1422 are opposite surfaces of the second connection section 142 in the thickness direction, the first surface 1421 is a surface of the second connection section 142 facing the electrode assembly 13 in the thickness direction, and the second surface 1422 is a surface of the second connection section 142 facing away from the electrode assembly 13 in the thickness direction.

A portion of the multi-layer conductive sheet 1410 is welded to the first surface 1421, and another portion of the multi-layer conductive sheet 1410 is welded to the second surface 1422, in other words, the multi-layer conductive sheet 1410 is welded to the first surface 1421 and the second surface 1422, respectively, so as to achieve conductive connection between the multi-layer conductive sheet 1410 and the second connection section 142.

The multi-layer conductive sheet 1410 is welded with the first surface 1421 and the second surface 1422 respectively, so that the connection strength of the multi-layer conductive sheet 1410 and the second connection section 142 is ensured, and the multi-layer conductive sheet 1410 is welded at two sides of the second connection section 142, so that the welding difficulty of the multi-layer conductive sheet 1410 and the second connection section 142 is reduced, and the connection reliability of the multi-layer conductive sheet 1410 and the second connection section 142 is ensured.

Referring to fig. 7 to 9, fig. 7 is a top view of an adapter 14 according to some embodiments of the present application, fig. 8 is a cross-sectional view along A-A of fig. 7, and fig. 9 is a partial enlarged view at B of fig. 8.

According to some embodiments of the present application, as shown in fig. 7 to 9, the second connection section 142 includes a body region 1423 and a first connection region 1424 protruding in a direction away from the electrode assembly 13 (see fig. 3), and the first surface 1421 and the second surface 1422 are located at the first connection region 1424.

The body region 1423 is a base portion of the second connection section 142, the first connection region 1424 is connected to the body region 1423, and the first connection region 1424 protrudes with respect to the body region 1423 in a direction away from the electrode assembly 13, such that a surface of the first connection region 1424, which is close to the electrode assembly 13, is away from the electrode assembly 13 with respect to a surface of the body region 1423, which is close to the electrode assembly 13.

The first surface 1421 and the second surface 1422 are located in the first connection region 1424, the first surface 1421 and the second surface 1422 protrude from the main body region 1423 in a direction away from the electrode assembly 13, and a region for accommodating the conductive sheet 1410 is formed between the first connection region 1424 and the electrode assembly 13, so that the assembly connection between the second connection section 142 and the electrode assembly 13 is not affected after the multi-layer conductive sheet 1410 is connected to the first surface 1421 and the second surface 1422.

According to some embodiments of the present application, as shown in fig. 7 to 9, the second connection section 142 includes a first connection region 1424 for connection with the first connection section 141 and two second connection regions 1425 for connection with the electrode assembly 13 (see fig. 3), the first connection region 1424 is located between the two second connection regions 1425, and the multi-layered conductive sheet 1410 is connected to opposite sides of the first connection region 1424.

The first connection region 1424 is located between the two second connection regions 1425, and reasonably distributes the assembly space, so that on one hand, the connection stress of the second connection section 142 and the electrode assembly 13 is balanced, and on the other hand, the connection stability of the first connection section 141 and the second connection section 142 is ensured.

According to some embodiments of the present application, the second connection section 142 is directly connected with the electrode assembly 13 through two second connection regions 1425.

The second connection section 142 is directly connected to the electrode assembly 13 through two second connection regions 1425, the second connection regions 1425 being regions of the second connection section 142 for connecting the electrode assembly 13, and the second connection section 142 is electrically connected to the electrode assembly 13 through the second connection regions 1425.

The second connection section 142 is directly connected with the electrode assembly 13 through the second connection region 1425, so that current transmission is conveniently realized, and overcurrent capacity is ensured.

According to some embodiments of the present application, the second connection section 142 is welded with the electrode assembly 13 through two second connection regions 1425.

The second connection section 142 is welded with the electrode assembly 13 through two second connection regions 1425, so that the connection stability of the second connection section 142 and the electrode assembly 13 is ensured, and the overcurrent capacity is ensured.

According to some embodiments of the present application, as shown in fig. 7 to 9, the second connection section 142 further includes a body region 1423, the first connection region 1424 is connected to the body region 1423, the second connection region 1425 protrudes from a side of the body region 1423 facing the electrode assembly 13, a maximum thickness of the first connection region 1424 is smaller than a minimum thickness of the body region 1423, and a maximum thickness of the first connection region 1424 is smaller than a minimum thickness of one of the two second connection regions 1425.

The first connection region 1424 may be formed by thinning the thickness of the second connection section 142, and the thickness of the first connection region 1424 may be reduced as much as possible under the condition of ensuring the connection of the first connection section 141 and the first connection region 1424, in other words, the first connection region 1424 may be the thinnest portion of the thickness of the second connection section 142.

The assembly thickness of the first connection section 141 after being connected with the first connection region 1424 is thinner than the assembly thickness of the first connection section 141 after being connected with the main body region 1423 and the second connection region 1425, the space occupation of the first connection section 141 after being assembled with the second connection section 142 is smaller, and the energy density of the battery cell 1 is improved.

The second connection region 1425 protrudes toward the electrode assembly 13 with respect to the body region 1423, ensuring contact of the second connection region 1425 with the electrode assembly 13, and ensuring welding quality of the second connection region 1425 with the electrode assembly 13.

In order to ensure that the second connection regions 1425 are connected with the inner and outer ring pole pieces of the winding structure of the electrode assembly 13, as shown in fig. 7, the second connection regions 1425 are in a V-shaped structure, the V-shaped structure points to the center of the second connection section 142, and the two second connection regions 1425 are oppositely arranged, so that the connection stress of the second connection section 142 and the electrode assembly 13 is balanced. The first connection region 1424 is located between the two second connection regions 1425, and the profile of the first connection region 1424 is matched with the profiles of the two second connection regions 1425, so as to ensure that the first connection section 141 and the second connection section 142 have a larger contact area, and facilitate ensuring the connection stability of the first connection section 141 and the second connection section 142. For example, the portion of the first connection section 141 connected to the second connection section 142 has a trapezoid structure.

To facilitate the connection positioning of the second connection section 142 with the electrode assembly 13, the body region 1423 of the second connection section 142 is provided with a through hole 1426, for example, as shown in fig. 7, the through hole 1426 may be located in the middle of the second connection section 142, and the assembly positioning of the second connection section 142 with the electrode assembly 13 is achieved by aligning the through hole 1426 with the winding center hole of the electrode assembly 13 when the second connection section 142 is assembled with the electrode assembly 13; meanwhile, the electrolyte is convenient to contact with the electrode assembly 13 after passing through the through hole 1426 when being injected to infiltrate the electrode assembly 13, and air in the electrode assembly 13 or gas after chemical reaction of the electrolyte can be discharged through the through hole 1426. In other embodiments of the present application, a plurality of through holes 1426 may be provided, and may be distributed in other positions of the body region 1423, in addition to being provided in the middle of the second connection section 142.

Referring to fig. 10, fig. 10 is a cross-sectional view of a battery cell 1 according to some embodiments of the present application. According to some embodiments of the present application, as shown in fig. 10, a surface of the first connection section 141 adjacent to the electrode assembly 13 is higher than a surface of the second connection section 142 adjacent to the electrode assembly 13 in a thickness direction of the second connection section 142.

The surface of the second connection section 142 adjacent to the electrode assembly 13 is the surface of the second connection section 142 connected to the electrode assembly 13. The surface of the first connection section 141 near the electrode assembly 13 being higher than the surface of the second connection section 142 near the electrode assembly 13 means that the surface of the first connection section 141 near the electrode assembly 13 is distant from the electrode assembly 13 with respect to the surface of the second connection section 142 near the electrode assembly 13, in other words, the first connection section 141 is distant from the electrode assembly 13 with respect to the second connection section 142 such that the first connection section 141 is not in contact with the electrode assembly 13, and the first connection section 141 may have a gap with the electrode assembly 13.

The first connecting section 141 is far away from the electrode assembly 13 relative to the second connecting section 142, so that when the second connecting section 142 is connected with the electrode assembly 13, the first connecting section 141 can be prevented from influencing the assembly connection of the second connecting section 142 and the electrode assembly 13, and the connection reliability of the second connecting section 142 and the electrode assembly 13 is ensured.

According to some embodiments of the application, the stiffness of the second connection section 142 is greater than the stiffness of the first connection section 141.

The second connecting section 142 has a stiffness greater than that of the first connecting section 141, in other words, the first connecting section 141 is more easily bent with respect to the second connecting section 142.

Since the first connection section 141 has a certain length, the space occupation of the adapter 14 can be reduced by bending the first connection section 141 when the assembly of the end cap 11 and the case 12 is performed after the connection of the adapter 14 with the electrode assembly 13 and the electrode terminal 15 is completed in the assembly process of the battery cell 1. The rigidity of the first connecting section 141 is smaller, so that the difficulty in bending the first connecting section 141 relative to the second connecting section 142 can be reduced, and the bending of the first connecting section 141 can be realized conveniently. Meanwhile, the second connection section 142 has high rigidity so as to ensure connection reliability of the second connection section 142 with the electrode assembly 13.

Referring to fig. 11, fig. 11 is a schematic diagram illustrating a bending state of the adaptor 14 according to some embodiments of the application. According to some embodiments of the present application, as shown in fig. 11, the first connection section 141 includes a first sub-connection section 1411, a second sub-connection section 1412, and a third sub-connection section 1413, the first sub-connection section 1411 being for connection with the second connection section 142, the third sub-connection section 1413 being for connection with the electrode terminal 15, the second sub-connection section 1412 connecting the first sub-connection section 1411 and the third sub-connection section 1413. Before the adaptor 14 is bent, along the length direction of the adaptor 14, the first sub-connection section 1411 and the third sub-connection section 1413 are located at two ends of the second sub-connection section 1412, and after the adaptor 14 is bent, the first sub-connection section 1411 and the third sub-connection section 1413 are located at two sides of the second sub-connection section 1412 in the thickness direction.

As shown in fig. 11, a first bending region 1414 is formed between the first sub-connecting section 1411 and the second sub-connecting section 1412, a second bending region 1415 is formed between the second sub-connecting section 1412 and the third sub-connecting section 1413, and the first connecting section 141 is bent to be S-shaped. In other words, the second sub-connection section 1412 is bent around the first bending axis 1416 (see fig. 7) with respect to the first sub-connection section 1411 to form a first bending region 1414, and the third sub-connection section 1413 is bent around the second bending axis 1417 (see fig. 7) with respect to the second sub-connection section 1412 to form a second bending region 1415. The first connecting section 141 has a first surface and a second surface opposite to each other, the first surface is located at the inner ring of the first bending area 1414 at the first bending area 1414, the second surface is located at the outer ring of the first bending area 1414, the bending radius of the conductive sheet 1410 near the first surface is smaller, and the bending radius of the conductive sheet 1410 near the second surface is larger; at the second bending region 1415, the first surface is located at the outer ring of the second bending region 1415, the second surface is located at the inner ring of the second bending region 1415, the bending radius of the conductive sheet 1410 near the first surface is larger, and the bending radius of the conductive sheet 1410 near the second surface is smaller. After the first connecting section 141 is bent for the two times, the bending extension amounts of the conductive sheets 1410 are the same, namely, the edges of the two ends of each conductive sheet 1410 are flush, so that on one hand, the conductive sheets 1410 of the first connecting section 141 are uniformly stressed and are not easy to break, on the other hand, the height of the first connecting section 141 after being bent is controlled, the energy density of the battery monomer 1 is ensured, layering phenomenon of the multilayer structure is avoided, the inner layer is easy to fold, the height of the folded inner layer is increased, and the mounting space is occupied and the assembly of the battery monomer 1 is inconvenient.

According to some embodiments of the present application, the present application further provides a battery 100, which includes the battery cell 1 according to any one of the above aspects.

According to some embodiments of the present application, the present application further provides an electric device, which includes the battery cell 1 according to any one of the above schemes, where the battery cell 1 is used to provide electric energy for the electric device.

The powered device may be any of the aforementioned devices or systems that employ the battery cells 1.

According to some embodiments of the present application, referring to fig. 3 to 11, the present application provides a battery cell 1, the battery cell 1 is a cylindrical battery cell, and includes an end cap 11, a case 12, an electrode assembly 13, an adapter 14, and an electrode terminal 15. The housing 12 has an opening, and the end cap 11 is disposed at the opening of the housing 12. The electrode assembly 13 is disposed in the case 12, and the electrode terminals 15 are disposed in the end cap 11. The adapter 14 includes a first connection section 141 for connecting the electrode terminals 15 and a second connection section 142 for connecting the electrode assembly 13, the first connection section 141 and the second connection section 142 being provided separately and electrically connected to each other, the first connection section 141 being of a multilayer structure and including a plurality of layers of conductive sheets 1410 stacked and disposed, the second connection section 142 being sandwiched between the plurality of layers of conductive sheets 1410. The number of layers of the conductive sheets 1410 positioned on both sides of the second connection section 142 is the same, the second connection section 142 includes a first surface 1421 facing the electrode assembly 13 and a second surface 1422 facing away from the electrode assembly 13, and one portion of the conductive sheets 1410 among the plurality of layers of the conductive sheets 1410 is welded to the first surface 1421 and the other portion of the conductive sheets 1410 is welded to the second surface 1422.

According to the battery cell 1 of the embodiment of the application, the plurality of layers of conductive sheets 1410 are welded on two sides of the second connection section 142 respectively, and the number of layers of the conductive sheets 1410 on two sides of the second connection section 142 is low, so that the welding difficulty between the conductive sheets 1410 on each side of the second connection section 142 and the second connection section 142 is reduced, and the connection reliability of the plurality of layers of conductive sheets 1410 and the second connection section 142 is improved.

Fig. 12 shows a schematic flow chart of a method of manufacturing the battery cell 1 according to some embodiments of the present application. As shown in fig. 12, the method of manufacturing the battery cell 1 may include:

S401, providing an electrode terminal 15;

S402, providing an electrode assembly 13;

s403, providing a transfer piece 14, wherein the transfer piece 14 comprises a first connecting section 141 and a second connecting section 142, the first connecting section 141 and the second connecting section 142 are arranged in a split mode and are connected with each other, the first connecting section 141 is of a multi-layer structure and comprises a plurality of layers of conducting plates 1410 which are arranged in a stacked mode, the second connecting section 142 is of a single-layer structure, and the second connecting section 142 is clamped between the plurality of layers of conducting plates 1410;

s404, the first connection section 141 is connected to the electrode terminal 15, and the second connection section 142 is connected to the electrode assembly 13.

It should be noted that the order of the step "S401, providing the electrode terminal 15", the step "S402, providing the electrode assembly 13", and the step "S403, providing the adapter 14" is not unique, and in some embodiments, the step "S402, providing the electrode assembly 13", the step "S401, providing the electrode terminal 15", and the step "S403, providing the adapter 14" may be sequentially performed, or the step "S403, providing the adapter 14", the step "S402, providing the electrode assembly 13", and the step "S401, providing the electrode terminal 15" may be sequentially performed; the order of providing the electrode terminal 15 in step S401, providing the electrode assembly 13 in step S402, and providing the adapter 14 in step S403 is not limited in the present application.

Fig. 13 shows a schematic block diagram of a battery cell manufacturing apparatus 500 according to some embodiments of the application. As shown in fig. 13, the battery cell manufacturing apparatus 500 may include a providing module 501 and an assembling module 502. The providing module 501 is used for providing the electrode terminals 15, providing the electrode assembly 13, and providing the adapter 14. The adaptor 14 includes a first connecting section 141 and a second connecting section 142, where the first connecting section 141 and the second connecting section 142 are separately disposed and connected to each other, the first connecting section 141 is of a multilayer structure and includes a plurality of layers of conductive sheets 1410 disposed in a stacked manner, the second connecting section 142 is of a single-layer structure, and the second connecting section 142 is sandwiched between the plurality of layers of conductive sheets 1410. The assembly module 502 serves to connect the first connection section 141 to the electrode terminal 15 and the second connection section 142 to the electrode assembly 13.

According to the manufacturing apparatus 500 of the battery cell of the embodiment of the application, the battery cell 1 with high safety can be manufactured by the manufacturing apparatus.

While the application has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the application. 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

1. A battery cell, comprising:

The switching piece comprises a first connecting section for connecting an electrode terminal and a second connecting section for connecting an electrode assembly, wherein the first connecting section and the second connecting section are arranged in a split mode and are connected with each other, the first connecting section is of a multi-layer structure and comprises a plurality of layers of conducting plates which are arranged in a stacked mode, and the second connecting section is clamped between the plurality of layers of conducting plates.

2. The battery cell of claim 1, wherein the number of layers of conductive sheets on both sides of the second connection section is the same.

3. The battery cell of claim 1, wherein the minimum thickness of the second connection section is greater than the maximum thickness of any one of the plurality of conductive sheets.

4. The battery cell of claim 1, wherein each of the plurality of layers of conductive sheets has an equal thickness.

5. The battery cell of claim 1, wherein adjacent two of the plurality of layers of conductive sheets are welded or connected by conductive glue.

6. The battery cell of claim 1, wherein the second connection section is of a single layer structure.

7. The battery cell of claim 1, wherein the second connection segment includes a first surface facing the electrode assembly and a second surface facing away from the electrode assembly, a portion of the conductive sheet of the multilayer conductive sheet being welded to the first surface and another portion of the conductive sheet being welded to the second surface.

8. The battery cell of claim 7, wherein the second connection section includes a body region and a first connection region protruding in a direction away from the electrode assembly, the first surface and the second surface being located at the first connection region.

9. The battery cell of claim 1, wherein the second connection section includes a first connection region for connection with the first connection section and two second connection regions for connection with the electrode assembly, the first connection region being located between the two second connection regions, the multi-layered conductive sheet being connected to opposite sides of the first connection region.

10. The battery cell of claim 9, wherein the second connection section is directly connected to the electrode assembly through the two second connection regions.

11. The battery cell of claim 9, wherein the second connection section is welded with the electrode assembly through the two second connection regions.

12. The battery cell of claim 9, wherein the second connection section further comprises a body region, the first connection region is connected to an edge of the body region, the second connection region protrudes from a side of the body region facing the electrode assembly, a maximum thickness of the first connection region is less than a minimum thickness of the body region, and a maximum thickness of the first connection region is less than a minimum thickness of the smaller of the two second connection regions.

13. The battery cell according to any one of claims 1 to 12, wherein a surface of the first connection section adjacent to the electrode assembly is higher than a surface of the second connection section adjacent to the electrode assembly in a thickness direction of the second connection section.

14. The battery cell of any one of claims 1-12, wherein the second connection section has a stiffness that is greater than a stiffness of the first connection section.

15. A battery comprising a cell according to any one of claims 1-14.

16. A powered device comprising a battery cell as claimed in any one of claims 1 to 14, the battery cell being configured to provide electrical energy.

17. A manufacturing apparatus of a battery cell, characterized by comprising:

The electrode assembly comprises a providing module, a connecting piece and a connecting piece, wherein the connecting piece comprises a first connecting section and a second connecting section, the first connecting section and the second connecting section are arranged in a split mode and are connected with each other, the first connecting section is of a multi-layer structure and comprises a plurality of layers of conducting sheets which are arranged in a stacked mode, the second connecting section is of a single-layer structure, and the second connecting section is clamped between the plurality of layers of conducting sheets;

An assembly module for connecting the first connection section to the electrode terminal and connecting the second connection section to the electrode assembly.