CN218414802U

CN218414802U - Battery cell, battery and power consumption device

Info

Publication number: CN218414802U
Application number: CN202222253305.6U
Authority: CN
Inventors: 杨开焕; 周文林; 程启; 李全坤; 王鹏
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2022-08-25
Filing date: 2022-08-25
Publication date: 2023-01-31
Anticipated expiration: 2032-08-25

Abstract

The application provides a battery monomer, battery and power consumption device, battery monomer includes: an end cap assembly including an electrode terminal; a housing provided with an opening, the opening being closed by an end cap assembly; an electrode assembly disposed in the case, the electrode assembly including tabs; the adapter component is connected between the pole lug and the electrode terminal and comprises a first connecting area for connecting the electrode terminal, a second connecting area for connecting the pole lug, a transition connecting area positioned between the first connecting area and the second connecting area, and an insulating piece covering at least part of the transition connecting area. The transition connection area of this application embodiment through at the adapter part covers the insulating part, can improve the free life and the security performance of battery.

Description

Battery cell, battery and power consumption device

Technical Field

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

Background

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

The battery monomer comprises a shell, an end cover assembly and an electrode assembly, wherein the end cover assembly is covered on an opening of the shell, the electrode assembly is positioned in the shell, an electrode terminal is arranged on the end cover assembly, and a tab of the electrode assembly is connected with the electrode terminal through a switching component. During the transportation or use of the battery cell, the battery cell may suffer from thermal runaway and other problems, which may affect the safety performance of the battery cell.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present application provides a battery cell, a battery, and an electric device, which can improve the safety performance of an electrode main body.

In a first aspect, the present application provides a battery cell, comprising: an end cap assembly including an electrode terminal; a housing provided with an opening, the opening being closed by an end cap assembly; an electrode assembly disposed in the case, the electrode assembly including tabs; the adapter component is connected between the pole lug and the electrode terminal and comprises a first connecting area for connecting the electrode terminal, a second connecting area for connecting the pole lug, a transition connecting area positioned between the first connecting area and the second connecting area, and an insulating piece covering at least part of the transition connecting area.

In the technical scheme of the embodiment of the application, the battery cell comprises an end cover assembly, a shell, an electrode assembly, an adapter part and an insulating part. The end cap assembly closes the opening of the case, the electrode assembly is located within the case, and the end cap assembly and the case are capable of providing protection to the electrode assembly. The adapter part is connected between the tab and the electrode terminal through its own first connection region and second connection region, and is used for leading out electric energy of the electrode assembly to the outside of the case. The insulation piece covers at least part of the transition connection area, and on one hand, the insulation piece can provide protection for the transition connection area, so that the service life of the transition connection area is prolonged, and the problem that the transition connection area is easy to break due to vibration is solved; on the other hand, the insulating part covers the transition connection area, so that the transition connection area can be insulated from the electrode assembly or the end cover assembly when being broken, the short-circuit connection between the adapter part and the electrode assembly or the end cover assembly is improved, and the safety performance of the battery monomer is improved. In addition, when the battery cell is over-charged or the over-current caused by other abnormality flows, since the transition connection region is covered with the insulating member, the temperature rise rate of the transition connection region is greater than that of the first connection region and the second connection region, so that the transition connection region is more likely to be fused, thereby cutting off the current flow path between the tab and the electrode terminal and substantially preventing the explosion of the battery cell caused by the over-current. Therefore, the transition connection area of the adapter part is covered with the insulating part, so that the service life and the safety performance of the battery cell can be prolonged.

In some embodiments, the minimum cross-sectional area of the transition connection region is greater than or equal to the minimum cross-sectional area of the first connection region, and/or the minimum cross-sectional area of the transition connection region is greater than or equal to the minimum cross-sectional area of the second connection region. In this embodiment, the cross-sectional area of transition joining region is great, and the difficult fracture that takes place of transition joining region when battery monomer receives the vibration can improve the life of switching part, and when battery monomer internal emergence thermal runaway, because the insulating part covers the transition joining region, the fusing takes place for changing more soon in transition joining region temperature rise, can improve the free security performance of battery. Therefore, the embodiment of the application can ensure that the service life of the switching component is not influenced, so that the switching component is heated and is easy to fuse, and the safety performance of the battery cell is improved.

In some embodiments, the insulator surrounds a periphery of the transition zone. In this embodiment, the insulating member surrounds the transition connection area, i.e., the insulating member covers the entire transition connection area, which can further improve the protective performance of the insulating member and better improve the short-circuit connection between the adapter member and the electrode assembly or the end cap assembly. And when battery monomer takes place thermal runaway, the temperature rise speed of the transition joining region of being wrapped up by the insulating part is faster for the fusing takes place more easily in transition joining region, further improves battery monomer's security performance.

In some embodiments, at least a portion of the tab covers the insulator, and the edge of the tab facing the first connection region does not extend beyond the insulator. In the embodiments, the edge of the tab does not exceed the insulating piece, so that the tab is prevented from passing through the insulating piece and overlapping with the adapter component, and the problem of short circuit connection of the battery cells can be improved.

In some embodiments, the tab comprises a positive tab and a negative tab, and the adapter member connects the positive tab and the electrode terminal, wherein the first cross-sectional area of the transition connection region is a, the second cross-sectional area of the tab is B, and the first cross-sectional area and the second cross-sectional area satisfy 3A < 2B. In these embodiments, when the first cross-sectional area and the second cross-sectional area satisfy the above-mentioned relational expression, when the battery cell is thermally out of control, the transition connection region of the adapter member is more likely to break than the negative electrode tab, so that the current flow path between the positive electrode tab and the electrode terminal can be cut off in time, and the adapter member can break before the negative electrode tab breaks, thereby further improving the safety performance of the battery cell.

In some embodiments, the material of the positive tab and the interposer component comprises aluminum and the material of the negative tab comprises copper. In the embodiments, the positive tab and the adapter part are made of the same material, so that when the positive tab and the adapter part are welded, the connection strength of the positive tab and the adapter part can be improved. The negative tab includes copper, such that the interposer component can break prior to the negative tab when the first cross-sectional area and the second cross-sectional area satisfy the relationship.

In some embodiments, the tab includes a plurality of sub-tabs, the sub-tabs have a thickness Z, the number of sub-tabs is X, and the width of the sub-tabs is D, then B = X × D × Z. In the embodiments, the second cross-sectional area of the electrode lug is the sum of the cross sections of a plurality of sub-electrode lugs arranged in a stacked mode, so that the second cross-sectional area of the electrode lug can be calculated more accurately.

In some embodiments, the transition connection region includes a first portion connected to the first connection region and a second portion connected to the second connection region, the first portion having a cross-sectional area greater than a cross-sectional area of the second portion, the first portion including a through-hole disposed therethrough, at least a portion of the insulator being embedded in the through-hole. In these embodiments, the insulator is partially embedded in the through hole, which may improve the stability of the relative position between the insulator and the adapter member.

In some embodiments, the second connection region is disposed proud of the first connection region, the transition connection region includes a corner portion, and the insulator covers at least the corner portion. In the embodiments, the insulating member covers the corner part, so that protection can be provided for the corner part, and the problem that the corner part is easy to damage due to collision is solved.

In some embodiments, the electrode assembly includes a first electrode assembly including a first tab and a second electrode assembly; the second electrode assembly includes a second tab; the second connection region comprises a first partial region for connecting a first tab and a second partial region for connecting a second tab; the transition connection region comprises a first partition between the first subregion and the first connection region and a second partition between the second subregion and the first connection region; the insulating member includes a first section for covering at least a portion of the first section and a second section for covering at least a portion of the second section, the first section and the second section being integrally or unitarily disposed.

In these embodiments, the number of the electrode assemblies is multiple, each electrode assembly includes tabs, that is, the electrode assembly includes a first electrode assembly and a second electrode assembly, the first electrode assembly includes a first tab, the second electrode assembly includes a second tab, the adapter component connects the tabs of the multiple electrode assemblies, that is, the second connection region connects the first tab by using the first sub-region, and the second connection region connects the second tab by using the second sub-region. The transition connection region comprises a first partition between a first sub-region and a first connection region and a second partition between a second sub-region and a first connection region, the insulating part comprises a first subsection and a second subsection, and the first subsection and the second subsection respectively cover the first partition and the second partition, so that when a single battery body is out of control thermally, the first partition and the second partition are prone to breaking, the current flow path of the first tab and the electrode terminal and the current flow path of the second tab and the electrode terminal are timely cut off, and the safety performance of the single battery body is further improved.

In some embodiments, the first and second sub-sections are integrally interconnected, the first and second sections are integrally interconnected, and the first and second sections are integrally interconnected. In these embodiments, the first sub-area and the second sub-area are integrally connected to each other, and the second sub-area and the first sub-area are integrally connected to each other, so that the structure of the adapter component can be simplified. The first and second sections are integrally connected to each other, so that the structure of the insulating member can be simplified.

In some embodiments, the adapter member further comprises a printed area, the first connection area is located within the printed area, and the insulator and the printed area are spaced apart. In these embodiments, the first connection region is located within the print region, the electrode terminal and the adapter component are connected with each other within the print region, for example, the electrode terminal and the adapter component are welded with each other within the print region, and the insulation member and the print region are arranged at an interval, so that the influence of high temperature during welding on the insulation member can be improved, and the problem of heat melting of the insulation member can be improved.

In some embodiments, the minimum separation of the insulating element from the first connection region is between 0.5mm and 4mm, and/or the minimum separation of the insulating element from the second connection region is between 0.5mm and 4mm.

In the embodiments, the minimum distance between the insulating member and the first connection region is 0.5 mm-4 mm, which can improve that the insulating member is easy to deform when heated when the first connection region and the electrode terminal are welded due to the undersize distance between the insulating member and the first connection region; the problem that the insulation piece is too small in size due to the fact that the distance between the insulation piece and the first connection area is too large, and the transition connection area is not prone to fusing due to the fact that the temperature rise speed is too small can also be solved. The minimum distance between the insulating piece and the second connecting area is 0.5-4 mm, so that the problem that the insulating piece is easy to deform when being heated when the second connecting area and the lug are welded due to the fact that the distance between the insulating piece and the second connecting area is too small can be solved; the problem that the insulation piece is too small in size due to the fact that the distance between the insulation piece and the first connection area is too large, and fusing is not prone to occurring due to the fact that the temperature rise speed of the transition connection area is too small can also be solved.

In a second aspect, an embodiment of the present application further provides a battery, including any one of the battery cells according to the embodiments of the first aspect, where the battery cell is used to provide electrical energy.

In a third aspect, an embodiment of the present application further provides an electric device, including any of the battery cells in the embodiments of the first aspect.

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

Drawings

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 refer to like parts throughout the drawings. In the drawings:

FIG. 1 is a schematic structural diagram of a vehicle provided in an embodiment of the present application;

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

fig. 3 is a schematic structural diagram of a battery cell according to an embodiment of the present disclosure;

fig. 4 is an exploded view of a battery cell according to an embodiment of the present disclosure; (ii) a

Fig. 5 is a schematic diagram of a process for preparing a battery cell according to an embodiment of the present disclosure;

fig. 6 is a schematic view of the structure of the battery cell, in which the adaptor part and the insulator are engaged with each other according to an embodiment of the present disclosure;

FIG. 7 is a schematic illustration of the disassembled structure of FIG. 6;

FIG. 8 isbase:Sub>A cross-sectional view taken at A-A of FIG. 6;

fig. 9 is a schematic view of a mating structure of a transfer member and an insulating member in a battery cell according to another embodiment of the present application;

FIG. 10 is a schematic view of the disassembled structure of FIG. 9;

fig. 11 is a schematic view of a mating structure of a transfer member and an insulating member in a battery cell according to another embodiment of the present application;

fig. 12 is a disassembled view of fig. 11.

The reference numbers in the detailed description are as follows:

1. a vehicle; 10. a battery; 11. a controller; 12. a motor;

20. a battery module;

30. a box body; 301. a first tank portion; 302. a second tank portion;

40. a battery cell;

100. an electrode assembly; 101. a first electrode assembly; 102. a second electrode assembly; 110. a tab; 110a, edges; 111. a first tab; 112. a second tab; 120. an electrode body;

200. an insulating member; 210. a first section; 220. a second section;

300. an end cap assembly; 310. an electrode terminal;

400. a housing; 410. an opening;

500. an adapter component; 510. a first connection region; 520. a second attachment zone; 521. a first sub-region; 522. a second sub-region; 530. a transitional attachment zone; 531. a first portion; 532. a second portion; 532a, a through hole; 533. a corner portion; 534. a first partition; 535. a second partition; 540. a printing area;

x, a first direction; y, a second direction; z; and a third direction.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are merely used to more clearly illustrate the technical solutions of the present application, and therefore are only examples, and the protection scope of the present application is not limited thereby.

It should be noted that technical terms or scientific terms used in the embodiments of the present application should be understood as having a common meaning as understood by those skilled in the art to which the embodiments of the present application belong, unless otherwise specified.

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", and the like indicate orientations or positional relationships that are based on the orientations or positional relationships shown in the drawings, merely for convenience of description and simplified description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the embodiments of the present application.

Furthermore, the technical terms "first", "second", etc. 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, "a plurality" means two or more unless specifically defined otherwise.

In the description of the embodiments of the present application, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrated; mechanical connection or electrical connection is also possible; either directly or indirectly through intervening media, either internally or in any other relationship. Specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.

In the description of the embodiments of the present application, unless otherwise explicitly specified or limited, a first feature "on" or "under" a second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

At present, the application of the power battery is more and more extensive from the development of market situation. The power battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles and the like, and a plurality of fields such as military equipment and aerospace. With the continuous expansion of the application field of the power battery, the market demand is also continuously expanded.

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

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, etc. Batteries generally include a case for enclosing one or more battery cells. The box can avoid liquid or other foreign matters to influence the charging or discharging of battery monomer.

The battery monomer comprises an electrode component and electrolyte, wherein the electrode component comprises a positive pole piece, a negative pole piece and a separator. The battery cell mainly depends on metal ions to move between the positive pole piece and the negative pole piece to work. The positive pole piece comprises a positive current collector and a positive active substance layer, and the positive active substance layer is coated on the surface of the positive current collector; the positive electrode current collector comprises a positive electrode current collecting part and a positive electrode tab connected to the positive electrode current collecting part, wherein the positive electrode current collecting part is coated with a positive electrode active material layer, and the positive electrode tab is not coated with the positive electrode 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 pole piece comprises a negative pole current collector and a negative pole active substance layer, and the negative pole active substance layer is coated on the surface of the negative pole current collector; the negative current collector comprises a negative current collecting part and a negative lug connected with the negative current collecting part, wherein the negative current collecting part is coated with a negative active material layer, and the negative lug is not coated with the negative active material layer. The material of the negative electrode current collector may be copper, the negative electrode active material layer includes a negative electrode active material, and the negative electrode active material may be carbon, silicon, or the like. The material of the separator may be PP (polypropylene) or PE (polyethylene).

The present inventors have noted that, in a battery cell, the battery cell includes a case, an end cap assembly covering an opening of the case, and an electrode assembly located inside the case. The tabs of the electrode assembly are connected to the electrode terminals on the end cap assembly by the adapter member. During the use of the battery cell, the battery cell may be overcharged or otherwise abnormally caused to flow an overcurrent, which may cause a temperature increase to cause a safety problem of the battery cell.

In the related art, generally, by providing a weak region on the relay member, the weak region is more easily fused when the overcurrent flows in the battery cell, thereby cutting off the current flow path between the tab and the electrode terminal. However, in the transportation and use process of the battery cell, the weak area is also easily broken by mechanical vibration, and the service life of the adapter component and the battery cell is seriously influenced.

In order to solve the technical problems, the applicant researches and discovers that an insulating member can be covered on a certain area of the adapter part, and when overcurrent flows in the battery cells, the temperature rise speed of the part covered with the insulating member is higher, so that the fracture is more likely to occur. Meanwhile, the insulating part can be used for providing protection for the area, and the problem that the area is easy to break due to mechanical vibration is solved.

In view of the above, the inventors have conducted extensive studies to design a battery cell, a battery, and an electric device in order to solve the safety problem caused by the overcurrent flowing in the battery cell. In such a battery cell, the battery cell includes: an end cap assembly including an electrode terminal; a housing provided with an opening, the opening being closed by an end cap assembly; an electrode assembly disposed in the case, the electrode assembly including tabs; the adapter component is connected between the pole lug and the electrode terminal and comprises a first connecting area for connecting the electrode terminal, a second connecting area for connecting the pole lug, a transition connecting area positioned between the first connecting area and the second connecting area, and an insulating piece covering at least part of the transition connecting area.

The technical scheme described in the embodiment of the application is suitable for the battery and the electric device using the battery.

The electric device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool and the like. The vehicle can be a fuel oil vehicle, a 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 and the like; spacecraft include aircraft, rockets, space shuttles, spacecraft, and the like; electric toys include stationary or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric airplane toys, and the like; the electric power tools include metal cutting electric power tools, grinding electric power tools, assembly electric power tools, and electric power tools for railways, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, electric impact drills, concrete vibrators, and electric planers. The embodiment of the present application does not specifically limit the above power utilization device.

It should be understood that the technical solutions described in the embodiments of the present application are not limited to be applied to the above described batteries and electric devices, but may be applied to all batteries including a box and electric devices using batteries.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1 according to some embodiments of the present disclosure. The vehicle 1 can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range-extended automobile and the like. The interior of the vehicle 1 is provided with a battery 10, and the battery 10 may be provided at the bottom or at the head or tail of the vehicle 1. The battery 10 may be used for power supply of the vehicle 1, and for example, the battery 10 may serve as an operation power source of the vehicle 1. The vehicle 1 may further include a controller 11 and a motor 12, the controller 11 being configured to control the battery 10 to power the motor 12, for example, for start-up, navigation, and operational power requirements while the vehicle 1 is traveling.

In some embodiments of the present application, the battery 10 may be used not only as an operating power source of the vehicle 1, but also as a driving power source of the vehicle 1, instead of or in part instead of fuel or natural gas, to provide driving power for the vehicle 1.

In order to meet different power requirements, the battery 10 may include a plurality of battery cells, which are the smallest units constituting a battery module or a battery pack. A plurality of battery cells may be connected in series and/or in parallel via electrode terminals to be applied to various applications. The battery referred to in the present application includes a battery module or a battery pack. The plurality of battery cells can be connected in series or in parallel or in series-parallel, and the series-parallel refers to the mixture of series connection and parallel connection. In the embodiment of the application, a plurality of battery cells may directly form a battery pack, or may first form the battery module 20, and then the battery module 20 forms the battery pack.

Fig. 2 shows a schematic structural diagram of the battery 10 according to an embodiment of the present application.

As shown in fig. 2, the battery 10 includes a case 30 and a battery cell 40, and the battery cell 40 is accommodated in the case 30.

The box body 30 may be a single cuboid, a cylinder, a sphere, or other simple three-dimensional structure, or may be a complex three-dimensional structure formed by combining cuboid, cylinder, or sphere, which is not limited in the embodiment of the present application. The material of the box 30 may be an alloy material such as aluminum alloy and iron alloy, a polymer material such as polycarbonate and polyisocyanurate foam, or a composite material of glass fiber and epoxy resin, which is not limited in this embodiment.

The case 30 is used to accommodate the battery cells 40, and the case 30 may have various structures. In some embodiments, the box body 30 may include a first box body portion 301 and a second box body portion 302, the first box body portion 301 and the second box body portion 302 cover each other, and the first box body portion 301 and the second box body portion 302 jointly define a receiving space for receiving the battery cell 40. The second casing part 302 may be a hollow structure with one open end, the first casing part 301 is a plate-shaped structure, and the first casing part 301 covers the open side of the second casing part 302 to form the casing 30 with a containing space; the first tank portion 301 and the second tank portion 302 may be hollow structures with one side open, and the open side of the first tank portion 301 covers the open side of the second tank portion 302 to form the tank 30 with the accommodating space. Of course, the first tank portion 301 and the second tank portion 302 may be various shapes, such as a cylinder, a rectangular parallelepiped, and the like.

In order to improve the sealing property after the first casing portion 301 and the second casing portion 302 are connected, a sealing member, such as a sealant or a sealing ring, may be provided between the first casing portion 301 and the second casing portion 302.

If the first box portion 301 covers the top of the second box portion 302, the first box portion 301 can also be referred to as an upper box cover, and the second box portion 302 can also be referred to as a lower box 30.

In the battery 10, one or more battery cells 40 may be provided. If there are a plurality of battery cells 40, the plurality of battery cells 40 may be connected in series, in parallel, or in series-parallel, where in series-parallel refers to that the plurality of battery cells 40 are connected in series or in parallel. The plurality of battery monomers 40 can be directly connected in series or in parallel or in series-parallel, and the whole formed by the plurality of battery monomers 40 is accommodated in the box body 30; of course, a plurality of battery cells 40 may be connected in series, in parallel, or in series-parallel to form the battery module 20, and a plurality of battery modules 20 may be connected in series, in parallel, or in series-parallel to form a whole and be accommodated in the case 30.

Referring to fig. 2, in some embodiments, there are a plurality of battery cells 40, and the plurality of battery cells 40 are connected in series or in parallel or in series-parallel to form the battery module 20. A plurality of battery modules 20 are connected in series or in parallel or in series-parallel to form a whole, and are accommodated in the case 30.

The plurality of battery cells 40 in the battery module 20 may be electrically connected to each other by a bus member, so as to connect the plurality of battery cells 40 in the battery module 20 in parallel or in series-parallel.

In the present application, the battery cells 40 may include a lithium ion battery cell 40, a sodium ion battery cell 40, a magnesium ion battery cell 40, and the like, which is not limited in the embodiment of the present application. The battery cell 40 may be a cylinder, a flat body, a rectangular parallelepiped, or other shapes, which is not limited in the embodiments of the present application. The battery cells 40 are generally divided into three types in an encapsulated manner: the battery pack comprises a cylindrical battery cell 40, a square battery cell 40 and a soft package battery cell 40, and the embodiment of the application is not limited to this. However, for the sake of brevity, the following embodiments are described by taking the square battery cell 40 as an example.

Fig. 3 is a schematic structural diagram of a battery cell 40 according to some embodiments of the present disclosure, and fig. 4 is a schematic exploded structural diagram of the battery cell 40 according to some embodiments of the present disclosure. Fig. 5 is a schematic diagram of a process for preparing a battery cell 40 according to some embodiments of the present disclosure.

As shown in fig. 3 to 5, the battery cell 40 includes an end cap assembly 300, a case 400, an electrode assembly 100, and an insulating member 200, the end cap assembly 300 including an electrode terminal 310; the housing 400 is provided with an opening 410, and the end cap assembly 300 closes the opening 410; the electrode assembly 100 is disposed in the case 400, the electrode assembly 100 including tabs 110; the adapter member 500 is connected between the tab 110 and the electrode terminal 310, the adapter member 500 includes a first connection region 510 for connecting the electrode terminal 310, a second connection region 520 for connecting the tab 110, and a transition connection region 530 between the first connection region 510 and the second connection region 520, and the insulator 200 covers at least a portion of the transition connection region 530.

The housing 400 and the end cap assembly 300 combine to form an outer casing of the battery cell 40. The electrode assembly 100 and the insulating member 200 are located within the case 400.

The end cap assembly 300 refers to a member that covers the opening 410 of the case 400 to insulate the internal environment of the battery cell 40 from the external environment. Without limitation, the shape of the end cap assembly 300 may be adapted to the shape of the housing 400 to fit the housing 400. Alternatively, the end cap assembly 300 may be made of a material (e.g., an aluminum alloy) having a certain hardness and strength, so that the end cap assembly 300 is not easily deformed when being extruded and collided, and thus the battery cell 40 may have a higher structural strength and safety performance may be improved. The end cap assembly 300 may be provided with functional components such as the electrode terminal 310. The electrode terminal 310 may be used to be electrically connected with the electrode assembly 100 for outputting or inputting electric energy of the battery cell 40.

In some embodiments, a pressure relief mechanism for relieving the internal pressure of the battery cell 40 when the internal pressure or temperature reaches a threshold value may also be disposed on the end cap assembly 300. The material of the end cap assembly 300 may also be various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not limited in this embodiment.

The electrode assembly 100 may further include an electrode main body 120, and the tab 110 protrudes from one side of the electrode main body 120. The electrode body 120 is mainly formed by winding a tab 100a having an active material and a separator 100b, and the tab 100a includes a positive tab and a negative tab. The tabs 110 are disposed to protrude from the electrode main body 120, and the tabs 110 and the electrode main body 120 are combined to form the electrode assembly 100. The electrode assembly 100 is a component in which electrochemical reactions occur in the battery cell 40. One or more electrode assemblies 100 may be contained within the case 400. The tabs 110 include positive tabs and negative tabs, and the portions of the positive tabs and the negative tabs without active materials connected thereto respectively constitute the positive tabs and the negative tabs, and the positive tabs and the negative tabs may be located at one end of the electrode main body 120 together or at both ends of the electrode main body 120 respectively.

The case 400 is an assembly for mating with the cap assembly 300 to form an internal environment of the battery cell 40, wherein the formed internal environment may be used to house the electrode assembly 100, an electrolyte (not shown in the drawings), and other components. The housing 400 and the end cap assembly 300 may be separate components, and an opening 410 may be formed in the housing 400, and the opening 410 may be covered by the end cap assembly 300 at the opening 410 to form the internal environment of the battery cell 40. Without limitation, the end cap assembly 300 and the housing 400 may be integrated, and specifically, the end cap assembly 300 and the housing 400 may form a common connecting surface before other components are inserted into the housing, and then the end cap assembly 300 covers the housing 400 when it is necessary to enclose the inside of the housing 400. The housing 400 may be various shapes and various sizes, such as a rectangular parallelepiped, a cylinder, a hexagonal prism, and the like. Specifically, the shape of the case 400 may be determined according to the specific shape and size of the electrode assembly 100. The material of the housing 400 may be various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not limited in this embodiment.

The adapter member 500 is used to connect the tab 110 and the electrode terminal 310. The adapter part 500 can be configured in various ways, as long as the adapter part 500 can extend between the tab 110 and the electrode terminal 310, and the adapter part 500 has a first connection region 510 for connecting the electrode terminal 310, a second connection region 520 for connecting the tab 110, and a transition connection region 530 between the first connection region 510 and the second connection region 520. The material of the interposer 500 may include a metallic material, for example, the material of the interposer 500 may include a copper material or an aluminum material, etc. When two or more electrode assemblies 100 are provided in the battery cell 40, the adaptor member 500 may be connected between the tabs 110 of the two or more electrode assemblies 100 and the same electrode terminal 310, and the two or more tabs 110 connected by the adaptor member 500 are tabs 110 having the same polarity. Optionally, at least a portion of the adapter member 500 is positioned between the end face of the electrode body 120 and the end cap assembly 300.

The positive tab may be connected to the positive electrode terminal through one of the adaptor members 500, and the negative tab may be connected to the negative electrode terminal through the other adaptor member 500. The insulation 200 may cover at least a portion of the transition zone 530 of the at least one interposer component 500. The insulating member 200 may be made of various materials, and the insulating member 200 may be made of rubber, plastic, or other insulating materials. The insulating member 200 is made of rubber, so that the insulating member 200 has suitable elasticity to better improve the stress of the transition connecting region 530. The insulator 200 may cover the surface of the transition joint region 530 facing the end cap assembly 300, or the insulator 200 may be located on the surface of the transition joint region 530 facing the electrode body 120, or the insulator 200 may be disposed around the transition joint region 530.

In the technical solution of the embodiment of the present application, the battery cell 40 includes an end cap assembly 300, a case 400, an electrode assembly 100, an adapter member 500, and an insulating member 200. The end cap assembly 300 closes the opening 410 of the case 400, the electrode assembly 100 is located within the case 400, and the end cap assembly 300 and the case 400 can provide protection to the electrode assembly 100. The adapter member 500 is connected between the tab 110 and the electrode terminal 310 through its own first connection region 510 and second connection region 520, and serves to extract electric power of the electrode assembly 100 to the outside of the case 400. The insulation piece 200 covers at least part of the transition connection region 530, on one hand, the insulation piece 200 can provide protection for the transition connection region 530, the service life of the transition connection region 530 is prolonged, and the problem that the transition connection region 530 is prone to being broken due to vibration is solved; on the other hand, the insulating member 200 covers the transition connection region 530, so that the transition connection region 530 can maintain insulation from the electrode assembly 100 or the end cap assembly 300 when the transition connection region 530 is broken, short-circuit connection between the adapter member 500 and the electrode assembly 100 or the end cap assembly 300 is improved, and safety performance of the battery cell 40 is improved. In addition, when the battery cell 40 is subjected to the flow of overcurrent due to overcharge or other abnormalities, since the transition connection region 530 is covered with the insulating member 200, the rate of temperature rise of the transition connection region 530 is greater than that of the first and

second connection regions

510 and 520, so that the transition connection region 530 is more likely to be fused, thereby cutting off the current flow path of the tab 110 and the electrode terminal 310 and substantially preventing the explosion of the battery cell 40 due to overcurrent. Therefore, according to the embodiment of the present application, the insulation member 200 is covered on the transition connection region 530 of the adapter member 500, so that the service life and the safety performance of the battery cell 40 can be improved.

According to some embodiments of the present application, the minimum cross-sectional area of the transition connection region 530 is greater than or equal to the minimum cross-sectional area of the first connection region 510, and/or the minimum cross-sectional area of the transition connection region 530 is greater than or equal to the minimum cross-sectional area of the second connection region 520.

The cross-sectional area of the transition connection region 530 is the cross-sectional area of the transition connection region 530 in the thickness direction Z of the adapter part 500. The minimum cross-sectional area of the transition joint zone 530 refers to the minimum cross-sectional area of the transition joint zone 530 in the thickness direction Z. Similarly, the minimum cross-sectional area of the first connection region 510 refers to the minimum cross-sectional area of the first connection region 510 in the thickness direction Z, and the minimum cross-sectional area of the second connection region 520 refers to the minimum cross-sectional area of the second connection region 520 in the thickness direction Z. For example, the first direction X is a length direction, the second direction Y is a width direction, and the first connection region 510 and the second connection region 520 are spaced apart along the first direction X, and when the transition connection region 530, the first connection region 510, and the second connection region 520 are arranged at equal thicknesses, the minimum cross-sectional area of the transition connection region 530 may be the cross-sectional area at the position of the minimum width of the transition connection region 530, that is, the cross-sectional area of the transition connection region 530 at the position of the minimum extension size in the second direction Y. The first direction X may be a length direction of the electrode assembly 100, and when the electrode assembly 100 is plural, the second direction Y may be a side-by-side arrangement direction of the plural electrode assemblies 100.

In these optional embodiments, the cross-sectional area of the transition connection region 530 is large, the transition connection region 530 is not easily broken when the battery cell 40 is vibrated, the service life of the adapting member 500 can be prolonged, and when thermal runaway occurs in the battery cell 40, the transition connection region 530 is heated more quickly and easily to be fused due to the fact that the insulating member 200 covers the transition connection region 530, and the safety performance of the battery cell 40 can be improved. Therefore, the embodiment of the application can ensure that the service life of the adapter component 500 is not affected, so that the adapter component 500 is heated and easily fused, and the safety performance of the single battery 40 is improved.

Referring to fig. 6 to 8, fig. 6 isbase:Sub>A schematic view illustratingbase:Sub>A fitting structure ofbase:Sub>A connecting part and an insulating part inbase:Sub>A battery cell 40 according to some embodiments of the present disclosure, fig. 7 isbase:Sub>A schematic view illustratingbase:Sub>A disassembled structure of fig. 6, and fig. 8 isbase:Sub>A cross-sectional view taken alongbase:Sub>A-base:Sub>A of fig. 6.

According to some embodiments of the present application, as shown in fig. 6-8, the insulator 200 surrounds the periphery of the transition joint region 530.

The insulation member 200 surrounds the periphery of the transition region, which means that the insulation member 200 is cylindrical and is sleeved outside the transition connection region 530, so that the peripheral side of the transition connection region 530 is covered by the insulation member 200.

In these alternative embodiments, the insulator 200 is disposed around the transition joint region 530, i.e., the insulator 200 covers the entire transition joint region 530, which further improves the shielding performance of the insulator 200 and improves the shorting connection between the adapter member 500 and the electrode assembly 100 or the end cap assembly 300. And when the battery monomer 40 is out of control due to heat, the temperature rise speed of the transition connection region 530 wrapped by the insulating member 200 is higher, so that the transition connection region 530 is easier to fuse, and the safety performance of the battery monomer 40 is further improved.

According to some embodiments of the present application, with continued reference to fig. 5, at least a portion of the tab 110 covers the insulator 200, and the edge 110a of the tab 110 facing the first connection region 510 does not extend beyond the insulator 200.

The tab 110 covering insulator 200 includes: the tab 110 covers only the second connection region 520, or the tab 110 extends from the second connection region 520 toward the first connection region 510, i.e., the tab 110 may cover at least a portion of the transition connection region 530, as long as the edge 110a of the tab 110 toward the first connection region 510 does not extend beyond the insulator 200. The edge 110a of the tab 110 toward the first connection region 510 refers to the edge of the tab 110 near the first connection region 510.

When the tab 110 includes a plurality of sub-tabs, the edge 110a is an edge of the misaligned tab when the plurality of sub-tabs 110 are misaligned. Alternatively, when the tab 110 may be misaligned, the edge 110a may be an edge where the tab 110 is located under the misalignment error limit.

In these embodiments, the edge of the tab 110 does not extend beyond the insulator 200, and the tab 110 is prevented from passing over the insulator 200 and overlapping the adaptor member 500, which can improve the short circuit connection problem of the battery cell 40.

According to some embodiments of the present application, the tab 110 includes a positive tab and a negative tab, the adapting member 500 connects the positive tab and the electrode terminal 310, the transition connection region 530 has a first cross-sectional area a, the tab 110 has a second cross-sectional area B, and the first cross-sectional area and the second cross-sectional area satisfy 3A < 2B.

It is understood that the positive tab may be connected to the positive electrode terminal through the adapter 500 according to any of the above embodiments, and the insulator 200 may not be disposed on the other adapter connecting the negative tab to the negative electrode terminal.

In these alternative embodiments, when thermal runaway of the battery cell occurs, the transition connection region 530 is more likely to be broken than the negative electrode tab, so that the current flow path between the positive electrode tab and the electrode terminal 310 can be cut off in time, and the safety performance of the battery cell 40 is further improved.

Alternatively, the material of the adapter member 500 may include aluminum or copper, and the material of the tab 110 may also include aluminum or copper. The aluminum has a flow capacity of about 4A/mm ² ～5A/mm ² For example, the overcurrent capacity of aluminum is 5A/mm ² The copper has a current capacity of about 7A/mm ² ～9A/mm ² For example, the copper has a current capacity of 8A/mm ² 。

In some embodiments, the material of the positive tab and the interposer 500 includes aluminum and the material of the negative tab includes copper.

In these embodiments, the positive tab and the adaptor member 500 are made of the same material, so that the connection strength between the positive tab and the adaptor member 500 can be improved when the positive tab and the adaptor member 500 are welded. The negative tab includes copper, which allows the interposer 500 to break before the negative tab when the first cross-sectional area a and the second cross-sectional area B satisfy the relationship described above.

According to some embodiments of the present application, the tab 110 includes a plurality of sub-tabs, the thickness of the sub-tabs is Z, the number of the sub-tabs is X, the width of the sub-tabs is D, and then B = X × D × Z.

Alternatively, a plurality of sub-tabs of the tab 110 are stacked on each other.

Optionally, when the widths of the plurality of sub-tabs included in the tab 11 are different, the width D of the sub-tab is an average width of the plurality of sub-tabs.

Alternatively to this, the first and second parts may, 15mm-X- (-150mm), 20mm-D (-50mm and 3um-Z-20um.

In these alternative embodiments, the tab 110 is typically formed from a plurality of sub-tabs arranged in a stack, and the second cross sectional area of the tab 110 is taken as the sum of the cross sections of the plurality of sub-tabs arranged in a stack, so that the calculation of the second cross sectional area of the tab 110 is more accurate.

According to some embodiments of the present application, with continued reference to fig. 6 and 7, the transition connection region 530 includes a first portion 531 connected to the first connection region 510 and a second portion 532 connected to the second connection region 520, the first portion 531 having a cross-sectional area greater than a cross-sectional area of the second portion 532, the first portion 531 including a through-hole 532a disposed therethrough, at least a portion of the insulator 200 being embedded in the through-hole 532a. The boundary between the first portion 531 and the second portion 532 is illustrated in dashed lines in fig. 7, and the dashed lines do not constitute a limitation on the structure of the battery cell according to the embodiment of the present application.

When the adapter member 500 is configured to be of equal thickness, the cross-sectional area of the first portion 531 may be greater than the cross-sectional area of the second portion 532 such that the width of the first portion 531 is greater than the width of the second portion 532.

In these alternative embodiments, the insulating member 200 is partially inserted into the through hole 532a, which can improve the stability of the relative position between the insulating member 200 and the adapting member 500.

According to some embodiments of the present application, with continued reference to fig. 6 and 7, the second connection region 520 is disposed to protrude from the first connection region 510, the transition connection region 530 includes a corner portion 533, and the insulator 200 covers at least the corner portion 533.

The sizes of the second connection area 520 and the first connection area 510 are different, or the bending of the interposer 500 may cause a corner portion 533 in the transition connection area 530, the corner portion 533 is prone to stress concentration, the corner portion 533 is prone to fracture due to mechanical vibration, and the service life of the interposer 500 is affected.

In these alternative embodiments, the insulation member 200 covering the corner portions 533 can provide protection to the corner portions 533, and improve the problem that the corner portions 533 are vulnerable to being knocked.

Referring to fig. 4 to 10 together, fig. 9 is a schematic structural view of an adapter and an insulator of a battery cell 40 according to another embodiment of the present disclosure, and fig. 10 is a schematic disassembly structural view of fig. 9.

According to some embodiments of the present application, with continued reference to fig. 4-10, the electrode assembly 100 includes a first electrode assembly 101 and a second electrode assembly 102, the first electrode assembly 101 including a first tab 111; the second electrode assembly 102 includes a second tab 112; the second connection region 520 comprises a first sub-region 521 for connecting the first tab 111 and a second sub-region 522 for connecting the second tab 112; transition connection region 530 includes a first partition 534 located between first sub-region 521 and first connection region 510 and a second partition 535 located between second sub-region 522 and first connection region 510; the insulating member 200 includes a first section 210 for covering at least a portion of the first section 534 and a second section 220 for covering at least a portion of the second section 535, the first section 210 and the second section 220 being provided separately or integrally.

The first tab 111 and the second tab 112 may be positive tabs, and the first tab 111 and the second tab 112 may also be negative tabs.

In these alternative embodiments, first, the battery cell 40 includes a plurality of electrode assemblies 100, i.e., the first electrode assembly 101 and the second electrode assembly 102, and the plurality of electrode assemblies 100 can increase the capacity of the battery cell 40. When the battery cell 40 includes the first electrode assembly 101 and the second electrode assembly 102, the first electrode assembly 101 is provided with the first tab 111 thereon, the second electrode assembly 102 is provided with the second tab 112, and the second connection region 520 may simultaneously connect the first tab 111 and the second tab 112 through the first sub-region 521 and the second sub-region 522 such that the same connection member is connected to the electrode terminal 310 and the tabs of the two electrode assemblies 100. When the second connection region 520 includes the first sub-region 521 and the second sub-region 522, the corresponding transition connection region 530 includes a first sub-region 534 located between the first sub-region 521 and the first connection region 510, and a second sub-region 535 located between the second sub-region 522 and the first connection region 510, the insulating member 200 includes a first sub-region 210 and a second sub-region 220, and the first sub-region 210 and the second sub-region 220 respectively cover the first sub-region 534 and the second sub-region 535, so that when the battery cell 40 is thermally runaway, the first sub-region 534 and the second sub-region 535 are both easily broken, and further the current flow paths between the first tab 111 and the electrode terminal 310, and between the second tab 112 and the electrode terminal 310 are cut off in time, thereby further improving the safety performance of the battery cell 40.

As shown in fig. 6 and 7, the first and second sub-portions 210 and 220 may be separated from each other, that is, the first and second sub-portions 210 and 220 are spaced apart from each other.

Alternatively, as shown in fig. 9 and 10, the first and

second sections

210 and 220 may be integrally formed to simplify the structure of the insulator 200 and to improve the structural strength of the insulator 200. Further, when the first partition 534 and the second partition 535 are separately provided, that is, when the first partition 534 and the second partition 535 are provided at intervals in the second direction Y, a corner portion 533 is provided between the first partition 534 and the second partition 535, and the first partition 210 and the second partition 220 are integrally provided to better cover the corner portion 533.

As shown in fig. 6 to 10, the first sub-area 521 and the second sub-area 522 may be disposed at intervals, for example, the first sub-area 521 and the second sub-area 522 are disposed at intervals along the direction in which the first electrode assembly 101 and the second electrode assembly 102 are disposed side by side, so as to reduce the material consumption of the interposer 500. Correspondingly, the first section 534 and the second section 535 may also be separately disposed, further reducing the material usage of the adapter component 500. At this time, the relay member 500 includes first and

second sub-sections

521 and 522 located at the same side as the first connection region 510 and spaced apart in the direction in which the first and

second electrode assemblies

101 and 102 are arranged side by side, and first and

second sub-sections

534 and 535 spaced apart in the direction in which the first and

second electrode assemblies

101 and 102 are arranged side by side.

Referring to fig. 11 and 12, fig. 11 is a schematic structural view of an adaptor and an insulator of a battery cell 40 according to still other embodiments of the present disclosure, and fig. 12 is a schematic disassembly structural view of fig. 11.

According to some embodiments of the present application, as shown in fig. 1 and 12, the first sub-section 521 and the second sub-section 522 are integrally interconnected, the first partition 534 and the second partition 535 are integrally interconnected, and the first section 210 and the second section 220 are integrally interconnected.

In these alternative embodiments, the first sub-section 521 and the second sub-section 522 are integrally interconnected, and the second sub-section 535 and the first sub-section 534 are integrally interconnected, which can simplify the structure of the interposer 500. The first and

second sections

210 and 220 are integrally interconnected, which can simplify the structure of the insulator 200.

According to some embodiments of the present application, as shown in fig. 6-12, the adapter member 500 further includes a printed area 540, the first connection area 510 is located within the printed area 540, and the insulator 200 and the printed area 540 are spaced apart.

The printed area 540 may be an area of the adapter 500 having a relatively high coefficient of friction, and the printed area 540 may have a friction protrusion disposed therein. The shape of the printed area 540 may be at least one of circular, polygonal, elliptical, and combinations thereof.

In these alternative embodiments, the first connection region 510 is located within the print region 540, the electrode terminal 310 and the adapter member 500 are connected to each other within the print region 540, for example, the electrode terminal 310 and the adapter member 500 are welded to each other within the print region 540, and the insulation member 200 and the print region 540 are spaced apart from each other, so that the influence of high temperature during welding on the insulation member 200 can be improved, and the problem of heat melting of the insulation member 200 can be improved.

According to some embodiments of the present application, as shown in fig. 5, the minimum distance m between the insulating member 200 and the first connection region 510 is 0.5mm to 4mm, and/or the minimum distance n between the insulating member 200 and the second connection region 520 is 0.5mm to 4mm.

In these alternative embodiments, the minimum distance m between the insulating member 200 and the first connection region 510 is 0.5mm to 4mm, which can improve the thermal susceptibility of the insulating member 200 to deformation when the first connection region 510 and the electrode terminal 310 are welded due to too small distance between the insulating member 200 and the first connection region 510; the problem that the insulation member 200 is too small in size due to too large distance between the insulation member 200 and the first connection region 510, and the transition connection region 530 is not easily fused due to too small temperature rise speed can also be solved. The minimum distance n between the insulating piece 200 and the second connection area 520 is 0.5 mm-4 mm, so that the problem that the insulating piece 200 is easy to deform when the second connection area 520 and the tab 110 are welded due to the fact that the distance between the insulating piece 200 and the second connection area 520 is too small can be solved; the problem that the insulation member 200 is too small in size due to too large distance between the insulation member 200 and the first connection region 510, and the transition connection region 530 is not easily fused due to too small temperature rise speed can also be solved.

According to some embodiments of the present application, there is also provided a battery including the battery cell 40 according to any of the above aspects.

According to some embodiments of the present application, there is also provided an electric device, including the battery cell 40 according to any one of the above aspects, and the battery cell 40 is used for providing electric energy for the electric device.

The powered device may be any of the aforementioned devices or systems that employ the battery cell 40.

As shown in fig. 4 to 12, the battery cell 40 includes an end cap assembly 300, a case 400, an electrode assembly 100, an adaptor member 500, and an insulating member 200, the end cap assembly 300 including an electrode terminal 310; the housing 400 is provided with an opening 410, and the end cap assembly 300 closes the opening 410; the electrode assembly 100 is disposed in the case 400, the electrode assembly 100 including tabs 110; the adapter member 500 is connected between the tab 110 and the electrode terminal 310, the adapter member 500 includes a first connection region 510 for connecting the electrode terminal 310, a second connection region 520 for connecting the tab 110, and a transition connection region 530 between the first connection region 510 and the second connection region 520, and the insulator 200 covers at least a portion of the transition connection region 530. The minimum cross-sectional area of the transition joint region 530 is greater than or equal to the minimum cross-sectional area of the first joint region 510 and/or the minimum cross-sectional area of the transition joint region 530 is greater than or equal to the minimum cross-sectional area of the second joint region 520. The insulator 200 surrounds the periphery of the transition junction 530. The transition connection region 530 has a first cross-sectional area a and a second cross-sectional area B of the tab 110, the first and second cross-sectional areas satisfying 2A < 3B. The second connection region 520 is disposed proud of the first connection region 510, the transition connection region 530 includes a corner portion 533, and the insulator 200 covers at least the corner portion 533. The adapter member 500 further includes a patterned area 540, the first attachment area 510 is located within the patterned area 540, and the insulator 200 and the patterned area 540 are spaced apart. The minimum distance m between the insulating member 200 and the first connection region 510 is 0.5mm to 4mm, and/or the minimum distance n between the insulating member 200 and the second connection region 520 is 0.5mm to 4mm.

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

Claims

1. A battery cell, comprising:

an end cap assembly including an electrode terminal;

a housing provided with an opening, the end cap assembly closing the opening;

an electrode assembly disposed within the case, the electrode assembly including tabs;

an adapter component connected between the tab and the electrode terminals, the adapter component including a first connection area for connecting the electrode terminals, a second connection area for connecting the tab and a transition connection area between the first connection area and the second connection area, and

an insulator covering at least a portion of the transition zone.

2. The battery cell according to claim 1, wherein the minimum cross-sectional area of the transition connection region is greater than or equal to the minimum cross-sectional area of the first connection region and/or the minimum cross-sectional area of the transition connection region is greater than or equal to the minimum cross-sectional area of the second connection region.

3. The battery cell of claim 1, wherein the insulator surrounds the transition connection region periphery.

4. The battery cell of claim 1, wherein at least a portion of a tab overlies the insulator, the edge of the tab facing the first connection region not extending beyond the insulator.

5. The battery cell of claim 1,

the tab comprises a positive tab and a negative tab,

the switching component is connected with the positive lug and the electrode terminal,

the first cross-sectional area of the transition connection region is A, the second cross-sectional area of the negative electrode tab is B, and the first cross-sectional area and the second cross-sectional area meet the condition that 3A is less than 2B.

6. The battery cell of claim 5, wherein the material of the positive tab and the interposer component comprises aluminum and the material of the negative tab comprises copper.

7. The battery cell of claim 5, wherein the tab comprises a plurality of sub-tabs, the sub-tabs have a thickness Z, the number of sub-tabs is X, the sub-tabs have a width D, and then B = X.

8. The battery cell of claim 1, wherein the transition connection region comprises a first portion connected to the first connection region and a second portion connected to the second connection region, the first portion having a cross-sectional area greater than a cross-sectional area of the second portion, the first portion comprising a through-hole disposed therethrough, at least a portion of the insulator being embedded in the through-hole.

9. The battery cell as recited in claim 1 wherein the second connection region is disposed proud of the first connection region, the transition connection region comprises a corner portion, and the insulator covers at least the corner portion.

10. The battery cell according to claim 1,

the electrode assembly includes a first electrode assembly including a first tab and a second electrode assembly; the second electrode assembly includes a second tab;

the second connecting area comprises a first sub-area for connecting the first tab and a second sub-area for connecting the second tab;

the transition connection region comprises a first partition located between the first sub-region and the first connection region and a second partition located between the second sub-region and the first connection region;

the insulating piece comprises a first subsection and a second subsection, the first subsection is used for covering at least part of the first partition, the second subsection is used for covering at least part of the second partition, and the first subsection and the second subsection are arranged separately or integrally.

11. The battery cell of claim 10, wherein the first and second sub-regions are integrally interconnected, the first and second partitions are integrally interconnected, and the first and second sections are integrally interconnected.

12. The battery cell of claim 1, wherein the interposer component further comprises a printed area, the first connection area is located within the printed area, and the insulator and the printed area are spaced apart.

13. The battery cell according to claim 1, wherein the minimum distance between the insulating member and the first connection region is 0.5mm to 4mm, and/or the minimum distance between the insulating member and the second connection region is 0.5mm to 4mm.

14. A battery comprising the battery cell of any one of claims 1-13.

15. An electrical device comprising a cell according to any one of claims 1 to 13 for providing electrical energy.