Battery monomer, battery and electric device

Abstract

The invention provides a battery monomer, a battery and a power utilization device, and the battery monomer comprises an end cover assembly which comprises an electrode terminal; the shell is provided with an opening, and the end cover assembly seals the opening; the electrode assembly is arranged in the shell, and the electrode assembly comprises a tab; the switching component is connected between the tab and the electrode terminal, the switching component comprises a first connecting area used for connecting the electrode terminal, a second connecting area used for connecting the tab and a transition connecting area located between the first connecting area and the second connecting area, and the insulating part covers at least part of the transition connecting area. According to the embodiment of the invention, the transition connection area of the switching part is covered with the insulating part, so that the service life and the safety performance of the battery monomer can be improved.

Description

Battery cells, batteries and electrical devices Technical Field

[0001] The present application relates to the field of batteries, and in particular to a battery cell, a battery, and an electrical device. Background Art

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0003] A battery cell consists of a housing, an end cap assembly covering the housing opening, and an electrode assembly within the housing. The end cap assembly is equipped with electrode terminals, and the electrode assembly's tabs connect to the electrode terminals via adapter components. During transportation or use, the battery cell may experience thermal runaway and other issues, affecting its safety.

[0004] Summary of the Invention

[0005] In view of the above problems, the present application provides a battery cell, a battery and an electrical device, which can improve the safety performance of the electrode body.

[0006] In the first aspect, the present application provides a battery cell, comprising: an end cap assembly, comprising an electrode terminal; a shell, provided with an opening, the end cap assembly closing the opening; an electrode assembly, arranged in the shell, the electrode assembly comprising a tab; a transition component, connected between the tab and the electrode terminal, the transition component comprising a first connection area for connecting the electrode terminal, a second connection area for connecting the tab and a transition connection area located between the first connection area and the second connection area, and an insulating member, covering at least part of the transition connection area.

[0007] In the technical solution of the embodiment of the present application, the battery cell includes an end cap assembly, a shell, an electrode assembly, a transition component and an insulating component. The end cap assembly closes the opening of the shell, and the electrode assembly is located inside the shell. The end cap assembly and the shell can provide protection for the electrode assembly. The transition component is connected between the tab and the electrode terminal through its own first connection area and second connection area, and is used to lead the electrical energy of the electrode assembly to the outside of the shell. The insulating component covers at least part of the transition connection area. On the one hand, the insulating component can provide protection to the transition connection area, increase the service life of the transition connection area, and improve the problem that the transition connection area is easily broken by vibration; on the other hand, the insulating component covers the transition connection area, so that when the transition connection area breaks, it can remain insulated from the electrode assembly or the end cap assembly, improve the short-circuit connection between the transition component and the electrode assembly or the end cap assembly, and improve the safety performance of the battery cell. Furthermore, when an overcharge or other abnormality causes an overcurrent to flow through a battery cell, the transition connection area, covered by the insulating member, causes a faster temperature rise than the first and second connection areas, making the transition connection area more susceptible to melting, thereby severing the current flow path between the tab and the electrode terminal and substantially preventing the battery cell from exploding due to overcurrent. Therefore, by covering the transition connection area of ​​the adapter component with an insulating member, the embodiments of the present application can improve the service life and safety of the battery cell.

[0008] 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 ​​the transition connection region is larger, and when the battery cell is subjected to vibration, the transition connection region is less likely to break, which can increase the service life of the adapter component. When thermal runaway occurs in the battery cell, since the insulating member covers the transition connection region, the temperature of the transition connection region rises faster and is more likely to melt, which can improve the safety performance of the battery cell. Therefore, the embodiment of the present application can make the adapter component more likely to melt when heated, while ensuring that the service life of the adapter component is not affected, thereby improving the safety performance of the battery cell.

[0009] In some embodiments, the insulating member surrounds the outer periphery of the transition junction region. In this embodiment, the insulating member surrounds the transition junction region, i.e., the insulating member covers the entire transition junction region. This further enhances the insulating member's protective performance and improves the short-circuit connection between the adapter component and the electrode assembly or end cap assembly. Furthermore, when a battery cell experiences thermal runaway, the temperature of the transition junction region encased by the insulating member rises more rapidly, making it more susceptible to melting, further enhancing the safety of the battery cell.

[0010] In some embodiments, at least a portion of the tab covers the insulating member, and the edge of the tab facing the first connection region does not extend beyond the insulating member. In these embodiments, the edge of the tab does not extend beyond the insulating member, preventing the tab from crossing over the insulating member and overlapping the transition component, thereby improving the short-circuit connection problem of the battery cell.

[0011] In some embodiments, the tabs include a positive tab and a negative tab, and a transition component connects the positive tab and the electrode terminal. 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 and second cross-sectional areas satisfy the relationship 3A < 2B. In these embodiments, when the first and second cross-sectional areas satisfy the aforementioned relationship, if thermal runaway occurs in a battery cell, the transition connection region of the transition component is more likely to rupture than the negative tab. This allows the current flow path between the positive tab and the electrode terminal to be promptly severed, and allows the transition component to rupture before the negative tab, further improving the safety performance of the battery cell.

[0012] In some embodiments, the positive tab and the transition component are made of aluminum, while the negative tab is made of copper. In these embodiments, the positive tab and the transition component are made of the same material, which improves the connection strength between the positive tab and the transition component when welded. The negative tab is made of copper, and when the first and second cross-sectional areas satisfy the aforementioned relationship, the transition component can break before the negative tab.

[0013] In some embodiments, the tab includes multiple sub-tabs, each tab has a thickness of Z, the number of sub-tabs is X, and the width of the sub-tab is D, so B = X * D * Z. In these embodiments, the second cross-sectional area of ​​the tab is calculated by taking the sum of the cross-sectional areas of the multiple stacked sub-tabs, making the calculation of the second cross-sectional area of ​​the tab more accurate.

[0014] 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 cross-sectional area of ​​the first portion is larger than the cross-sectional area of ​​the second portion. The first portion includes a through-hole extending therethrough, and the insulating member is at least partially embedded in the through-hole. In these embodiments, the partial embedding of the insulating member in the through-hole can improve the relative positional stability between the insulating member and the transition component.

[0015] In some embodiments, the second connection region is arranged to protrude from the first connection region, the transition connection region includes a corner portion, and the insulating member covers at least the corner portion. In these embodiments, the insulating member covering the corner portion can provide protection to the corner portion and improve the problem that the corner portion is easily damaged by bumps.

[0016] In some embodiments, the electrode assembly includes a first electrode assembly and a second electrode assembly, the first electrode assembly includes a first electrode tab; the second electrode assembly includes a second electrode tab; the second connection area includes a first sub-area for connecting the first electrode tab and a second sub-area for connecting the second electrode tab; the transition connection area includes a first partition located between the first sub-area and the first connection area and a second partition located between the second sub-area and the first connection area; the insulating member includes a first partition for covering at least a portion of the first partition and a second partition for covering at least a portion of the second partition, and the first partition and the second partition are arranged separately or integrally.

[0017] In these embodiments, there are multiple electrode assemblies, each of which includes a tab. Specifically, the electrode assembly includes a first electrode assembly and a second electrode assembly, the first electrode assembly includes a first tab, and the second electrode assembly includes a second tab. A transition component connects the tabs of the multiple electrode assemblies, specifically, the second connection region connects the first tab using the first subregion, and the second connection region connects the second tab using the second subregion. The transition connection region includes a first subregion located between the first subregion and the first connection region, and a second subregion located between the second subregion and the first connection region. The insulating member includes a first subregion and a second subregion, the first subregion and the second subregion covering the first subregion and the second subregion, respectively. This allows the first subregion and the second subregion to be easily fractured when thermal runaway occurs in the battery cell, thereby promptly severing the current flow path between the first tab and the electrode terminal, and between the second tab and the electrode terminal, further improving the safety performance of the battery cell.

[0018] In some embodiments, the first sub-region and the second sub-region are interconnected as a whole, the first sub-region and the second sub-region are interconnected as a whole, and the first sub-section and the second sub-section are interconnected as a whole. In these embodiments, the first sub-region and the second sub-region are interconnected as a whole, and the second sub-region and the first sub-region are interconnected as a whole, which can simplify the structure of the adapter component. The first sub-section and the second sub-section are interconnected as a whole, which can simplify the structure of the insulating member.

[0019] In some embodiments, the adapter component further includes a printed area, the first connection area is located within the printed area, and the insulating member is spaced apart from the printed area. In these embodiments, the first connection area is located within the printed area, the electrode terminals and the adapter component are connected to each other within the printed area, for example, the electrode terminals and the adapter component are welded to each other within the printed area, and the insulating member is spaced apart from the printed area. This can reduce the impact of high temperatures on the insulating member during welding and alleviate the problem of the insulating member melting due to heat.

[0020] In some embodiments, a minimum distance between the insulating member and the first connection region is 0.5 mm to 4 mm, and / or a minimum distance between the insulating member and the second connection region is 0.5 mm to 4 mm.

[0021] In these embodiments, the minimum spacing between the insulating member and the first connection area is 0.5 mm to 4 mm, which can not only improve the problem of the insulating member being easily deformed by heat when the first connection area and the electrode terminal are welded due to the small spacing between the insulating member and the first connection area, but also improve the problem of the insulating member being too small in size and the transition connection area being too slow to cause melting due to the large spacing between the insulating member and the first connection area. The minimum spacing between the insulating member and the second connection area is 0.5 mm to 4 mm, which can not only improve the problem of the insulating member being easily deformed by heat when the second connection area and the tab are welded due to the small spacing between the insulating member and the second connection area, but also improve the problem of the insulating member being too small in size and the transition connection area being too slow to cause melting due to the large spacing between the insulating member and the first connection area.

[0022] In a second aspect, an embodiment of the present application further provides a battery, comprising a battery cell according to any one of the above-mentioned embodiments of the first aspect, wherein the battery cell is used to provide electrical energy.

[0023] In a third aspect, an embodiment of the present application further provides an electrical device comprising a battery cell according to any one of the above-mentioned embodiments of the first aspect.

[0024] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0026] FIG1 is a schematic structural diagram of a vehicle provided in one embodiment of the present application;

[0027] FIG2 is a schematic structural diagram of a battery pack provided in one embodiment of the present application;

[0028] FIG3 is a schematic structural diagram of a battery cell provided in one embodiment of the present application;

[0029] FIG4 is a schematic diagram of the exploded structure of a battery cell provided in one embodiment of the present application;

[0030] FIG5 is a schematic diagram of a preparation process of a battery cell provided in one embodiment of the present application;

[0031] FIG6 is a schematic diagram of the structure of the cooperation between the adapter component and the insulating component in the battery cell provided by one embodiment of the present application;

[0032] FIG7 is a schematic diagram of the disassembled structure of FIG6;

[0033] FIG8 is a cross-sectional view of the section AA in FIG6;

[0034] FIG9 is a schematic diagram of the structure of the cooperation between the adapter component and the insulating component in a battery cell provided by another embodiment of the present application;

[0035] FIG10 is a schematic diagram of the disassembled structure of FIG9;

[0036] FIG11 is a schematic diagram of the structure of the cooperation between the adapter component and the insulating component in a battery cell provided in another embodiment of the present application;

[0037] FIG12 is a schematic diagram of the disassembled structure in FIG11 .

[0038] The accompanying drawings in the specific implementation manner are as follows:

[0039] 1. Vehicle; 10. Battery; 11. Controller; 12. Motor;

[0040] 20. Battery module;

[0041] 30. Box body; 301. First box body portion; 302. Second box body portion;

[0042] 40. Battery cells;

[0043] 100, electrode assembly; 101, first electrode assembly; 102, second electrode assembly; 110, tab; 110a, edge; 111, first tab; 112, second tab; 120, electrode body;

[0044] 200, insulating member; 210, first subsection; 220, second subsection;

[0045] 300, end cap assembly; 310, electrode terminal;

[0046] 400, housing; 410, opening;

[0047] 500, transition component; 510, first connection area; 520, second connection area; 521, first sub-area; 522, second sub-area; 530, transition connection area; 531, first portion; 532, second portion; 532a, through hole; 533, corner portion; 534, first sub-area; 535, second sub-area; 540, printing area;

[0048] X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0049] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0050] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should have the common meanings understood by technicians in the field to which the embodiments of the present application belong.

[0051] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present application.

[0052] In addition, the technical terms "first," "second," etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the embodiments of the present application, the meaning of "plurality" is more than two, unless otherwise specifically defined.

[0053] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0054] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0055] Currently, market developments indicate that power batteries are becoming increasingly widely used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing.

[0056] In this application, battery cells may include lithium-ion secondary battery cells, lithium-ion primary battery cells, lithium-sulfur battery cells, sodium-lithium-ion battery cells, sodium-ion battery cells, or magnesium-ion battery cells, and the embodiments of this application are not limited thereto. Battery cells may be cylindrical, flat, rectangular, or in other shapes, and the embodiments of this application are not limited thereto.

[0057] The battery referred to in the embodiments of this 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 this application may include a battery module or a battery pack. A battery generally includes a casing that encloses one or more battery cells. The casing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0058] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly includes a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell primarily operates by the movement of metal ions between the positive and negative electrode sheets. The positive electrode sheet includes a positive current collector and a positive active material layer, with the positive active material layer coated on the surface of the positive current collector. The positive current collector includes a positive current collector portion and a positive tab connected to the positive current collector portion. The positive current collector portion is coated with the positive active material layer, while the positive tab is not coated with the positive active material layer. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material layer includes a positive active material. The positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, among others. The negative electrode sheet includes a negative current collector and a negative active material layer, which is coated on the surface of the current collector. The negative current collector includes a negative current collector portion and a negative tab connected to the current collector portion. The negative current collector portion is coated with the negative active material layer, while the negative tab is not. The negative current collector can be made of copper, and the negative active material layer includes a negative active material, which can be carbon or silicon. The separator can be made of materials such as PP (polypropylene) or PE (polyethylene).

[0059] The inventors note that a battery cell comprises a housing, an end cap assembly covering the housing opening, and an electrode assembly within the housing. The electrode lugs of the electrode assembly are connected to the electrode terminals on the end cap assembly via adapter components. During use, the battery cell may overcharge or experience other abnormalities, leading to excessive current flow. This excessive current can cause a temperature rise, potentially leading to safety issues for the battery cell.

[0060] In related technologies, a weak area is typically provided on the adapter component. When an overcurrent flows through the battery cell, the weak area is more likely to melt, thereby severing the current flow path between the tab and the electrode terminal. However, during transportation and use of the battery cell, the weak area is also susceptible to mechanical vibration and fracture, seriously affecting the service life of the adapter component and the battery cell.

[0061] To address the aforementioned technical issues, the applicant discovered that a certain area of ​​the adapter component could be covered with an insulating member. When an overcurrent flows through a battery cell, the area covered with the insulating member heats up faster, making it more susceptible to fracture. The insulating member can also provide protection to this area, alleviating the problem of mechanical vibration-induced fracture.

[0062] Based on the above considerations, and to address the safety issues caused by overcurrent in battery cells, the inventors, after in-depth research, have designed a battery cell, a battery, and an electrical device. Such a battery cell comprises: an end cap assembly including an electrode terminal; a housing having an opening, the end cap assembly sealing the opening; an electrode assembly disposed within the housing, the electrode assembly including a tab; a transition component connected between the tab and the electrode terminal, the transition component comprising a first connection region for connecting to the electrode terminal, a second connection region for connecting to the tab, a transition region located between the first and second connection regions, and an insulating member covering at least a portion of the transition region.

[0063] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical devices using batteries.

[0064] Electrical devices may include vehicles, mobile phones, portable devices, laptop computers, ships, spacecraft, electric toys, and electric tools, etc. Vehicles may include fuel vehicles, gas vehicles, or new energy vehicles. New energy vehicles may include pure electric vehicles, hybrid vehicles, or extended-range vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0065] It should be understood that the technical solutions described in the embodiments of the present application are not limited to the batteries and electrical equipment described above, but can also be applied to all batteries including boxes and electrical equipment using batteries. However, for the sake of simplicity, the following embodiments are explained using electric vehicles as an example.

[0066] Please refer to Figure 1, which is a schematic structural diagram of a vehicle 1 provided in some embodiments of the present application. The vehicle 1 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 10 is provided inside the vehicle 1, and the battery 10 can be provided at the bottom, head or tail of the vehicle 1. The battery 10 can be used to power the vehicle 1, for example, the battery 10 can serve as an operating power source for the vehicle 1. The vehicle 1 can also include a controller 11 and a motor 12, and the controller 11 is used to control the battery 10 to power the motor 12, for example, for starting, navigating and driving the vehicle 1.

[0067] In some embodiments of the present application, the battery 10 can serve not only as an operating power source for the vehicle 1 , but also as a driving power source for the vehicle 1 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .

[0068] In order to meet different power requirements, the battery 10 may include a plurality of battery cells, which refers to the smallest unit that constitutes a battery module or a battery pack. A plurality of battery cells can be connected in series and / or in parallel via electrode terminals for use in various applications. The batteries mentioned in this application include battery modules or battery packs. Among them, a plurality of battery cells can be connected in series, in parallel, or in mixed connection, and mixed connection refers to a mixture of series and parallel connection. In the embodiment of the present application, a plurality of battery cells can directly constitute a battery pack, or they can first constitute a battery module 20, and the battery module 20 can then constitute a battery pack.

[0069] FIG2 shows a schematic structural diagram of a battery 10 according to an embodiment of the present application.

[0070] As shown in FIG. 2 , the battery 10 includes a housing 30 and battery cells 40 . The battery cells 40 are housed in the housing 30 .

[0071] The housing 30 may be a simple three-dimensional structure such as a single rectangular parallelepiped, cylinder, or sphere, or a complex three-dimensional structure composed of simple three-dimensional structures such as rectangular parallelepiped, cylinder, or sphere, and the present embodiment is not limited thereto. The housing 30 may be made of an alloy material such as an aluminum alloy or an iron alloy, a polymer material such as polycarbonate or polyisocyanurate foam, or a composite material such as glass fiber and epoxy resin, and the present embodiment is not limited thereto.

[0072] The housing 30 is used to house the battery cells 40 and can have various structures. In some embodiments, the housing 30 can include a first housing portion 301 and a second housing portion 302. The first housing portion 301 and the second housing portion 302 overlap each other and together define a storage space for the battery cells 40. The second housing portion 302 can be a hollow structure with one end open. The first housing portion 301 is a plate-like structure, and the first housing portion 301 overlaps the open side of the second housing portion 302 to form the housing 30 with a storage space. The first housing portion 301 and the second housing portion 302 can also each be a hollow structure with one end open. The open side of the first housing portion 301 overlaps the open side of the second housing portion 302 to form the housing 30 with a storage space. Of course, the first housing portion 301 and the second housing portion 302 can have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0073] In order to improve the sealing performance after the first box body 301 and the second box body 302 are connected, a sealing member, such as a sealant, a sealing ring, etc., may also be provided between the first box body 301 and the second box body 302 .

[0074] Assuming that 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 .

[0075] In the battery 10 , there can be one or more battery cells 40 . If there are multiple battery cells 40 , the multiple battery cells 40 can be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections within the multiple battery cells 40 . The multiple battery cells 40 can be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery module 20 can be housed within the housing 30 . Alternatively, multiple battery cells 40 can be first connected in series, in parallel, or in a hybrid connection to form a battery module 20 , and then the multiple battery modules 20 can be connected in series, in parallel, or in a hybrid connection to form a single unit and housed within the housing 30 .

[0076] 2 , in some embodiments, there are multiple battery cells 40 , which are first connected in series, parallel, or in series to form a battery module 20 . Multiple battery modules 20 are then connected in series, parallel, or in series to form a whole, which is housed in a housing 30 .

[0077] The multiple battery cells 40 in the battery module 20 can be electrically connected via a busbar component to achieve parallel connection, series connection, or mixed connection of the multiple battery cells 40 in the battery module 20 .

[0078] In the present application, the battery cell 40 may include a lithium-ion battery cell 40, a sodium-ion battery cell 40, or a magnesium-ion battery cell 40, etc., and the embodiments of the present application are not limited to this. The battery cell 40 may be cylindrical, flat, rectangular, or other shapes, and the embodiments of the present application are not limited to this. The battery cell 40 is generally divided into three types according to the packaging method: cylindrical battery cells 40, square battery cells 40, and soft-pack battery cells 40, and the embodiments of the present application are not limited to this. However, for the sake of simplicity, the following embodiments are all explained using the square battery cell 40 as an example.

[0079] Figure 3 is a schematic diagram of the structure of a battery cell 40 provided in some embodiments of the present application, Figure 4 is a schematic diagram of the exploded structure of a battery cell 40 provided in some embodiments of the present application, and Figure 5 is a schematic diagram of the preparation process of a battery cell 40 provided in some embodiments of the present application.

[0080] As shown in Figures 3 to 5, the battery cell 40 includes an end cap assembly 300, a shell 400, an electrode assembly 100 and an insulating member 200, the end cap assembly 300 includes an electrode terminal 310; the shell 400 is provided with an opening 410, and the end cap assembly 300 closes the opening 410; the electrode assembly 100 is arranged in the shell 400, and the electrode assembly 100 includes a tab 110; the transition component 500 is connected between the tab 110 and the electrode terminal 310, the transition component 500 includes a first connection area 510 for connecting to the electrode terminal 310, a second connection area 520 for connecting to the tab 110 and a transition connection area 530 located between the first connection area 510 and the second connection area 520, and the insulating member 200 covers at least part of the transition connection area 530.

[0081] The housing 400 and the end cap assembly 300 are combined to form an outer shell of the battery cell 40. The electrode assembly 100 and the insulating member 200 are located in the housing 400.

[0082] The end cap assembly 300 refers to a component that covers the opening 410 of the shell 400 to isolate the internal environment of the battery cell 40 from the external environment. Without limitation, the shape of the end cap assembly 300 can be adapted to the shape of the shell 400 to match the shell 400. Optionally, the end cap assembly 300 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap assembly 300 is not easily deformed when squeezed or collided, so that the battery cell 40 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals 310 can be provided on the end cap assembly 300. The electrode terminal 310 can be used to electrically connect to the electrode assembly 100 for outputting or inputting electrical energy of the battery cell 40.

[0083] In some embodiments, the end cap assembly 300 may also be provided with a pressure relief mechanism for relieving the internal pressure of the battery cell 40 when the internal pressure or temperature reaches a threshold. The end cap assembly 300 may also be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment of the present application does not impose any particular limitation on this.

[0084] The electrode assembly 100 may also include an electrode body 120, with a tab 110 extending from one side of the electrode body 120. The electrode body 120 is mainly formed by winding a pole piece 100a containing active material and a separator 100b. The pole piece 100a includes a positive pole piece and a negative pole piece. The tab 110 extends from the electrode body 120, and the tab 110 and the electrode body 120 are combined to form the electrode assembly 100. The electrode assembly 100 is the component where the electrochemical reaction occurs in the battery cell 40. The housing 400 may contain one or more electrode assemblies 100. The tab 110 includes a positive tab and a negative tab. The portions of the positive and negative pole pieces that do not contain active material constitute the positive tab and the negative tab, respectively. The positive tab and the negative tab may be located together at one end of the electrode body 120 or at both ends of the electrode body 120.

[0085] The housing 400 is a component used to cooperate with the end cap assembly 300 to form the internal environment of the battery cell 40, wherein the formed internal environment can be used to accommodate the electrode assembly 100, the electrolyte (not shown in the figure), and other components. The housing 400 and the end cap assembly 300 can be independent components. An opening 410 can be set on the housing 400, and the end cap assembly 300 is closed 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 can also be integrated. Specifically, the end cap assembly 300 and the housing 400 can form a common connection surface before other components are inserted into the housing. When the interior of the housing 400 needs to be encapsulated, the end cap assembly 300 is closed to the housing 400. The housing 400 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the housing 400 can be determined according to the specific shape and size of the electrode assembly 100. The shell 400 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0086] The transition component 500 is used to connect the tab 110 and the electrode terminal 310. The transition component 500 can be shaped in a variety of ways, as long as it can extend between the tab 110 and the electrode terminal 310 and has a first connection region 510 for connecting to the electrode terminal 310, a second connection region 520 for connecting to the tab 110, and a transition region 530 located between the first connection region 510 and the second connection region 520. The transition component 500 can be made of a metal material, such as copper or aluminum. When two or more electrode assemblies 100 are provided in a battery cell 40, the transition component 500 can be connected between the tabs 110 of the two or more electrode assemblies 100 and the same electrode terminal 310, with the two or more tabs 110 connected by the transition component 500 being of the same polarity. Optionally, at least a portion of the transition component 500 is located between the end surface of the electrode body 120 and the end cap assembly 300.

[0087] The positive tab can be connected to the positive electrode terminal through a transition component 500, and the negative tab can be connected to the negative electrode terminal through another transition component 500. The insulating member 200 can cover at least a portion of the transition connection area 530 of at least one transition component 500. There are many ways to set the material of the insulating member 200, and the insulating member 200 can be made of insulating materials such as rubber and plastic. The insulating member 200 is made of rubber so that the insulating member 200 has appropriate elasticity and better improves the force of the transition connection area 530. The insulating member 200 can cover the surface of the transition connection area 530 facing the end cap assembly 300, or the insulating member 200 can be located on the surface of the transition connection area 530 facing the electrode body 120, or the insulating member 200 can be set around and wrap the transition connection area 530.

[0088] In the technical solution of the embodiment of the present application, the battery cell 40 includes an end cap assembly 300, a housing 400, an electrode assembly 100, a transition component 500, and an insulating member 200. The end cap assembly 300 closes the opening 410 of the housing 400. The electrode assembly 100 is located within the housing 400. The end cap assembly 300 and the housing 400 can provide protection for the electrode assembly 100. The transition component 500 is connected between the tab 110 and the electrode terminal 310 via its own first connection area 510 and second connection area 520, and is used to lead the electrical energy of the electrode assembly 100 to the outside of the housing 400. The insulating member 200 covers at least a portion of the transition joint region 530. This provides protection for the transition joint region 530, extending its service life and mitigating the problem of its susceptibility to vibration-induced fracture. Furthermore, the insulating member 200 covers the transition joint region 530, ensuring that the transition joint region 530 remains insulated from the electrode assembly 100 or end cap assembly 300 in the event of a fracture. This improves the short-circuit connection between the adapter component 500 and the electrode assembly 100 or end cap assembly 300, thereby enhancing the safety of the battery cell 40. Furthermore, when an overcharge or other abnormality causes an overcurrent to flow through the battery cell 40, the transition joint region 530, covered by the insulating member 200, experiences a faster temperature rise than the first connection region 510 and the second connection region 520. This makes the transition joint region 530 more susceptible to melting, thereby severing the current flow path between the tab 110 and the electrode terminal 310 and substantially preventing the battery cell 40 from exploding due to overcurrent. Therefore, the embodiment of the present application can improve the service life and safety performance of the battery cell 40 by covering the insulating member 200 in the transition connection area 530 of the adapter component 500.

[0089] According to some embodiments of the present application, the minimum cross-sectional area of ​​the transition connection zone 530 is greater than or equal to the minimum cross-sectional area of ​​the first connection zone 510 , and / or the minimum cross-sectional area of ​​the transition connection zone 530 is greater than or equal to the minimum cross-sectional area of ​​the second connection zone 520 .

[0090] The cross-sectional area of ​​the transition zone 530 is the cross-sectional area of ​​the transition zone 530 in the thickness direction Z of the adapter component 500. The minimum cross-sectional area of ​​the transition zone 530 refers to the minimum cross-sectional area of ​​the transition zone 530 in the thickness direction Z. Similarly, the minimum cross-sectional area of ​​the first connection zone 510 refers to the minimum cross-sectional area of ​​the first connection zone 510 in the thickness direction Z, and the minimum cross-sectional area of ​​the second connection zone 520 refers to the minimum cross-sectional area of ​​the second connection zone 520 in the thickness direction Z. For example, if the first direction X is the length direction and the second direction Y is the width direction, and the first connection zone 510 and the second connection zone 520 are spaced apart along the first direction X, when all parts of the adapter component 500 are arranged with equal thickness, that is, when the transition zone 530, the first connection zone 510, and the second connection zone 520 are arranged with equal thickness, the minimum cross-sectional area of ​​the transition zone 530 can be the cross-sectional area at the location of the minimum width of the transition zone 530, that is, the cross-sectional area at the location where the transition zone 530 extends the smallest dimension in the second direction Y. The first direction X may be the length direction of the electrode assembly 100 . When there are multiple electrode assemblies 100 , the second direction Y may be the direction in which the multiple electrode assemblies 100 are arranged side by side.

[0091] In these optional embodiments, the transition connection region 530 has a larger cross-sectional area, making it less likely to break when the battery cell 40 is subjected to vibration, thereby increasing the service life of the adapter component 500. Furthermore, when thermal runaway occurs within the battery cell 40, the insulating member 200 covers the transition connection region 530, causing the transition connection region 530 to heat up more quickly and more easily fuse, thereby improving the safety of the battery cell 40. Therefore, the embodiments of the present application ensure that the service life of the adapter component 500 is not affected while making the adapter component 500 more likely to fuse when heated, thereby improving the safety of the battery cell 40.

[0092] Please refer to Figures 6 to 8. Figure 6 is a schematic diagram of the matching structure of the transition component and the insulating component in the battery cell 40 provided in some embodiments of the present application, Figure 7 is a schematic diagram of the disassembled structure of Figure 6, and Figure 8 is a cross-sectional view at AA in Figure 6.

[0093] According to some embodiments of the present application, as shown in FIG. 6 to FIG. 8 , the insulating member 200 surrounds the outer circumference of the transition zone 530 .

[0094] The insulating member 200 surrounding the periphery of the transition zone means that the insulating member 200 is cylindrical and is sleeved outside the transition connection zone 530 , so that the periphery of the transition connection zone 530 is covered by the insulating member 200 .

[0095] In these optional embodiments, the insulating member 200 surrounds the transition connection region 530, that is, the insulating member 200 covers the entire transition connection region 530. This can further enhance the protective performance of the insulating member 200 and better prevent short circuits between the adapter component 500 and the electrode assembly 100 or the end cap assembly 300. Furthermore, when a battery cell 40 experiences thermal runaway, the transition connection region 530, encased by the insulating member 200, experiences a faster temperature rise, making the transition connection region 530 more susceptible to melting, further enhancing the safety of the battery cell 40.

[0096] According to some embodiments of the present application, please continue to refer to FIG. 5 , at least a portion of the tab 110 covers the insulating member 200 , and an edge 110 a of the tab 110 facing the first connection region 510 does not extend beyond the insulating member 200 .

[0097] The tab 110 covering the insulating member 200 includes: the tab 110 only covering the second connection region 520, or the tab 110 extending from the second connection region 520 toward the first connection region 510, that is, the tab 110 can cover at least a portion of the transition connection region 530, as long as the edge 110a of the tab 110 facing the first connection region 510 does not extend beyond the insulating member 200. The edge 110a of the tab 110 facing the first connection region 510 refers to the edge of the tab 110 close to the first connection region 510.

[0098] When the tab 110 includes multiple sub-tabs and the multiple sub-tabs 110 are staggered, the edge 110a is the edge of the staggered tab. Alternatively, when the tab 110 may be staggered, the edge 110a may also be the edge of the tab 110 at the position within the staggered error limit.

[0099] In these embodiments, the edge of the tab 110 does not extend beyond the insulating member 200 , preventing the tab 110 from crossing over the insulating member 200 and overlapping the transition component 500 , thereby improving the short circuit connection problem of the battery cell 40 .

[0100] According to some embodiments of the present application, the tab 110 includes a positive tab and a negative tab, the transition component 500 connects the positive tab and the electrode terminal 310, the first cross-sectional area of ​​the transition connection region 530 is A, the second cross-sectional area of ​​the tab 110 is B, and the first cross-sectional area and the second cross-sectional area satisfy 3A<2B.

[0101] It is understandable that the positive tab can be connected to the positive electrode terminal through the adapter component 500 described in any of the above embodiments, and the insulating member 200 may not be provided on the other adapter component connecting the negative tab to the negative electrode terminal.

[0102] In these optional embodiments, when thermal runaway occurs in the battery cell, the transition connection region 530 is more likely to break than the negative tab, so that the current flow path between the positive tab and the electrode terminal 310 can be cut off in time, further improving the safety performance of the battery cell 40.

[0103] Optionally, the material of the transition component 500 may include aluminum or copper, and the material of the tab 110 may also include aluminum or copper. The current carrying capacity of aluminum is approximately 4A / mm 2 ~5A / mm 2 For example, the flow capacity of aluminum is 5A / mm 2 , the current capacity of copper is about 7A / mm 2 ~9A / mm 2 For example, the overcurrent capacity of copper is 8A / mm 2 .

[0104] In some embodiments, the material of the positive electrode tab and the transition component 500 includes aluminum, and the material of the negative electrode tab includes copper.

[0105] In these embodiments, the positive tab and the transition component 500 are made of the same material, which improves the connection strength between the positive tab and the transition component 500 when they are welded together. The negative tab is made of copper, and when the first cross-sectional area A and the second cross-sectional area B satisfy the aforementioned relationship, the transition component 500 can break before the negative tab.

[0106] According to some embodiments of the present application, the tab 110 includes multiple sub-tabs, the thickness of the sub-tab is Z, the number of the sub-tabs is X, and the width of the sub-tab is D, then B=X*D*Z.

[0107] Optionally, the multiple sub-tabs of the tab 110 are stacked on top of each other.

[0108] Optionally, when the tab 11 includes multiple sub-tabs with different widths, the width D of the sub-tab is the average width of the multiple sub-tabs.

[0109] Optional, 15mm <X<150mm,20mm<D<50mm,3um<Z<20um。

[0110] In these optional embodiments, the tab 110 is generally formed by stacking a plurality of sub-tabs, and the second cross-sectional area of ​​the tab 110 is the sum of the cross-sectional areas of the plurality of stacked sub-tabs, so that the calculation of the second cross-sectional area of ​​the tab 110 is more accurate.

[0111] According to some embodiments of the present application, referring to Figures 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 cross-sectional area of ​​the first portion 531 is greater than that of the second portion 532. The first portion 531 includes a through-hole 532a extending therethrough, into which at least a portion of the insulating member 200 is embedded. The boundary between the first portion 531 and the second portion 532 is indicated by a dashed line in Figure 7 ; the dashed line does not limit the structure of the battery cells in the embodiments of the present application.

[0112] When the adapter component 500 is set to have a constant thickness, the cross-sectional area of ​​the first portion 531 is greater than the cross-sectional area of ​​the second portion 532 , which means that the width of the first portion 531 is greater than the width of the second portion 532 .

[0113] In these optional embodiments, the insulating member 200 is partially embedded in the through hole 532 a , which can improve the stability of the relative position between the insulating member 200 and the transition component 500 .

[0114] According to some embodiments of the present application, please continue to refer to Figures 6 and 7. The second connection area 520 is arranged to protrude from the first connection area 510. The transition connection area 530 includes a corner portion 533. The insulating member 200 at least covers the corner portion 533.

[0115] The second connection area 520 and the first connection area 510 have different sizes, or the adapter component 500 is bent, which will cause a corner portion 533 to exist in the transition connection area 530. The corner portion 533 is prone to stress concentration, causing the corner portion 533 to be easily broken due to mechanical vibration, affecting the service life of the adapter component 500.

[0116] In these optional embodiments, the insulating member 200 covering the corner portion 533 can provide protection to the corner portion 533 and improve the problem that the corner portion 533 is easily damaged by collision.

[0117] Please refer to Figures 4 to 10 together. Figure 9 is a structural diagram of the adapter component and the insulating component of the battery cell 40 provided in other embodiments of the present application, and Figure 10 is a disassembled structural diagram of Figure 9.

[0118] According to some embodiments of the present application, please continue to refer to Figures 4 to 10. The electrode assembly 100 includes a first electrode assembly 101 and a second electrode assembly 102, the first electrode assembly 101 includes a first electrode tab 111; the second electrode assembly 102 includes a second electrode tab 112; the second connection area 520 includes a first sub-area 521 for connecting the first electrode tab 111 and a second sub-area 522 for connecting the second electrode tab 112; the transition connection area 530 includes a first partition 534 located between the first sub-area 521 and the first connection area 510 and a second partition 535 located between the second sub-area 522 and the first connection area 510; the insulating member 200 includes a first sub-area 210 for covering at least a portion of the first partition 534 and a second sub-area 220 for covering at least a portion of the second partition 535, and the first sub-area 210 and the second sub-area 220 are arranged separately or as a whole.

[0119] The first electrode tab 111 and the second electrode tab 112 may be positive electrode tabs, or the first electrode tab 111 and the second electrode tab 112 may be negative electrode tabs.

[0120] In these optional embodiments, first, the battery cell 40 includes multiple electrode assemblies 100, namely, a first electrode assembly 101 and a second electrode assembly 102. The multiple 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 a first electrode tab 111, and the second electrode assembly 102 is provided with a second electrode tab 112. The second connection region 520 can simultaneously connect the first electrode tab 111 and the second electrode tab 112 through the first sub-region 521 and the second sub-region 522, so that the same connection component is connected to the electrode terminal 310 and the electrode tabs of the two electrode assemblies 100. When the second connection area 520 includes the first sub-area 521 and the second sub-area 522, the corresponding transition connection area 530 includes a first partition 534 located between the first sub-area 521 and the first connection area 510, and a second partition 535 located between the second sub-area 522 and the first connection area 510. The insulating part 200 includes a first section 210 and a second section 220. The first section 210 and the second section 220 cover the first partition 534 and the second partition 535 respectively, so that when the battery cell 40 has thermal runaway, the first partition 534 and the second partition 535 are prone to fracture, thereby causing the current flow path between the first pole ear 111 and the electrode terminal 310, and the current flow path between the second pole ear 112 and the electrode terminal 310 to be cut off in time, further improving the safety performance of the battery cell 40.

[0121] As shown in FIG. 6 and FIG. 7 , the first sub-portion 210 and the second sub-portion 220 may be disposed separately, that is, the first sub-portion 210 and the second sub-portion 220 are disposed spaced apart from each other.

[0122] Alternatively, as shown in Figures 9 and 10, the first subsection 210 and the second subsection 220 can be integrally provided to simplify the structure of the insulating member 200 and improve the structural strength of the insulating member 200. In addition, when the first subsection 534 and the second subsection 535 are separately provided, that is, when the first subsection 534 and the second subsection 535 are spaced apart along the second direction Y, a corner portion 533 is provided between the first subsection 534 and the second subsection 535. The integral provision of the first subsection 210 and the second subsection 220 can better cover the corner portion 533.

[0123] As shown in Figures 6 to 10, the first sub-region 521 and the second sub-region 522 can be spaced apart from each other. For example, the first sub-region 521 and the second sub-region 522 are spaced apart along the direction in which the first electrode assembly 101 and the second electrode assembly 102 are arranged side by side, so as to reduce the material used in the adapter component 500. Correspondingly, the first partition 534 and the second partition 535 can also be provided separately to further reduce the material used in the adapter component 500. In this case, the adapter component 500 includes the first sub-region 521 and the second sub-region 522 located on the same side of the first connection region 510 and spaced apart along the direction in which the first electrode assembly 101 and the second electrode assembly 102 are arranged side by side, and the first partition 534 and the second partition 535 are spaced apart along the direction in which the first electrode assembly 101 and the second electrode assembly 102 are arranged side by side.

[0124] Please refer to FIG. 11 and FIG. 12 . FIG. 11 is a schematic structural diagram of a transition component and an insulating component of a battery cell 40 provided in some embodiments of the present application, and FIG. 12 is a schematic structural diagram of the disassembled structure of FIG. 11 .

[0125] According to some embodiments of the present application, as shown in Figures 1 and 12, the first sub-area 521 and the second sub-area 522 are interconnected as one, the first partition 534 and the second partition 535 are interconnected as one, and the first division 210 and the second division 220 are interconnected as one.

[0126] In these optional embodiments, the first sub-area 521 and the second sub-area 522 are interconnected as one body, and the second sub-area 535 and the first sub-area 534 are interconnected as one body, which can simplify the structure of the adapter 500. The first sub-section 210 and the second sub-section 220 are interconnected as one body, which can simplify the structure of the insulating member 200.

[0127] According to some embodiments of the present application, as shown in FIG. 6 to FIG. 12 , the adapter component 500 further includes a printed area 540 , the first connection area 510 is located within the printed area 540 , and the insulating member 200 and the printed area 540 are spaced apart.

[0128] The printed area 540 may be an area with a larger friction coefficient on the adapter 500, and friction protrusions may be provided in the printed area 540. The shape of the printed area 540 may be at least one of a circle, a polygon, an ellipse, and a combination thereof.

[0129] In these optional embodiments, the first connection area 510 is located within the printed area 540, the electrode terminal 310 and the adapter component 500 are interconnected within the printed area 540, for example, the electrode terminal 310 and the adapter component 500 are welded to each other within the printed area 540, and the insulating part 200 and the printed area 540 are spaced apart, which can improve the effect of high temperature during welding on the insulating part 200 and improve the problem of the insulating part 200 melting due to heat.

[0130] According to some embodiments of the present application, as shown in FIG5 , the minimum distance m between the insulating member 200 and the first connection area 510 is 0.5 mm to 4 mm, and / or the minimum distance n between the insulating member 200 and the second connection area 520 is 0.5 mm to 4 mm.

[0131] In these optional embodiments, the minimum spacing m between the insulating member 200 and the first connection region 510 is 0.5 mm to 4 mm. This can improve the problem of the insulating member 200 being easily deformed by heat when welding the first connection region 510 to the electrode terminal 310 due to a small spacing between the insulating member 200 and the first connection region 510; it can also improve the problem of the insulating member 200 being too small and the transition connection region 530 being too slow to heat up and not easily melt due to a large spacing between the insulating member 200 and the first connection region 510. The minimum spacing n between the insulating member 200 and the second connection region 520 is 0.5 mm to 4 mm. This can improve the problem of the insulating member 200 being easily deformed by heat when welding the second connection region 520 to the tab 110 due to a small spacing between the insulating member 200 and the second connection region 520; it can also improve the problem of the insulating member 200 being too small and the transition connection region 530 being too slow to heat up and not easily melt due to a large spacing between the insulating member 200 and the first connection region 510.

[0132] According to some embodiments of the present application, the present application further provides a battery, comprising the battery cell 40 described in any of the above solutions.

[0133] According to some embodiments of the present application, the present application further provides an electrical device, comprising the battery cell 40 described in any of the above schemes, and the battery cell 40 is used to provide electrical energy to the electrical device.

[0134] The power-consuming device may be any of the aforementioned devices or systems using the battery cell 40 .

[0135] As shown in Figures 4 to 12, the battery cell 40 includes an end cap assembly 300, a shell 400, an electrode assembly 100, a transition component 500 and an insulating member 200, the end cap assembly 300 includes an electrode terminal 310; the shell 400 is provided with an opening 410, and the end cap assembly 300 closes the opening 410; the electrode assembly 100 is arranged in the shell 400, and the electrode assembly 100 includes a tab 110; the transition component 500 is connected between the tab 110 and the electrode terminal 310, the transition component 500 includes a first connection area 510 for connecting to the electrode terminal 310, a second connection area 520 for connecting to the tab 110 and a transition connection area 530 located between the first connection area 510 and the second connection area 520, and the insulating member 200 covers at least part of the transition connection area 530. The minimum cross-sectional area of ​​the transition zone 530 is greater than or equal to the minimum cross-sectional area of ​​the first connection zone 510, and / or the minimum cross-sectional area of ​​the transition zone 530 is greater than or equal to the minimum cross-sectional area of ​​the second connection zone 520. The insulating member 200 surrounds the outer periphery of the transition zone 530. The first cross-sectional area of ​​the transition zone 530 is A, and the second cross-sectional area of ​​the tab 110 is B. The first cross-sectional area and the second cross-sectional area satisfy 2A < 3B. The second connection zone 520 protrudes from the first connection zone 510. The transition zone 530 includes a corner portion 533, and the insulating member 200 covers at least the corner portion 533. The adapter component 500 also includes a printed area 540. The first connection zone 510 is located within the printed area 540, and the insulating member 200 and the printed area 540 are spaced apart. The minimum spacing m between the insulating member 200 and the first connection zone 510 is 0.5 mm to 4 mm, and / or the minimum spacing n between the insulating member 200 and the second connection zone 520 is 0.5 mm to 4 mm.

[0136] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, comprising: an end cap assembly including an electrode terminal; The housing is provided with an opening, and the end cover assembly closes the opening; An electrode assembly is disposed in the housing, the electrode assembly including a tab; a transition component connected between the tab and the electrode terminal, the transition component comprising a first connection region for connecting to the electrode terminal, a second connection region for connecting to the tab, and a transition connection region located between the first connection region and the second connection region; and An insulating member covers at least a portion of the transition connection area.

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

3. The battery cell according to claim 1, wherein: The insulating member surrounds the outer periphery of the transition zone.

4. The battery cell according to claim 1, wherein: At least a portion of the tab covers the insulating member, and an edge of the tab facing the first connection region does not extend beyond the insulating member.

5. The battery cell according to claim 1, wherein The tabs include a positive tab and a negative tab. The adapter component connects the positive tab 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 ear is B, and the first cross-sectional area and the second cross-sectional area satisfy 3A<2B. The battery cell according to claim 5 , wherein: The material of the positive electrode tab and the transition component includes aluminum, and the material of the negative electrode tab includes copper.

7. The battery cell according to claim 5, wherein: The tab includes a plurality of sub-tabs, the thickness of the sub-tab is Z, the number of the sub-tabs is X, and the width of the sub-tab is D, so B=X*D*Z.

8. The battery cell according to claim 1, wherein The transition connection area includes a first part connected to the first connection area and a second part connected to the second connection area. The cross-sectional area of ​​the first part is larger than the cross-sectional area of ​​the second part. The first part includes a through hole arranged therethrough, and at least a portion of the insulating member is embedded in the through hole.

9. The battery cell according to claim 1, characterized in that The second connection area is arranged to protrude from the first connection area, the transition connection area includes a corner portion, and the insulating member at least covers the corner portion.

10. The battery cell according to claim 1, wherein The electrode assembly includes a first electrode assembly and a second electrode assembly, the first electrode assembly includes a first electrode tab; the second electrode assembly includes a second electrode tab; The second connection area includes a first sub-area for connecting to the first tab and a second sub-area for connecting to the second tab; The transition connection area includes a first sub-area located between the first sub-area and the first connection area and a second sub-area located between the second sub-area and the first connection area; The insulating member includes a first sub-portion for covering at least a portion of the first sub-portion and a second sub-portion for covering at least a portion of the second sub-portion, wherein the first sub-portion and the second sub-portion are separately or integrally provided.

11. The battery cell according to claim 10, wherein: The first sub-area and the second sub-area are interconnected as a whole, the first partition and the second partition are interconnected as a whole, and the first section and the second section are connected to each other as a whole.

12. The battery cell according to claim 1, wherein The transition component further includes a printing area, the first connection area is located within the printing area, and the insulating member and the printing area are spaced apart.

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

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

15. An electrical device comprising the battery cell according to any one of claims 1 to 13, wherein the battery cell is used to provide electrical energy.

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