Battery monomer, battery and electric device

Abstract

The utility model provides a battery monomer, a battery and a power utilization device. The battery monomer comprises a shell, an electrode terminal, an electrode assembly, a current collection component and a protection structure, the shell comprises a wall part; the electrode terminal is mounted on the wall part in an insulating manner, and the wall part, provided with the electrode terminal, of the shell is called an end cover; the electrode assembly is accommodated in the shell, the electrode assembly comprises a main body and a tab extending from the main body, and the tab is formed at one end, close to the end cover, of the main body; the current collecting component is at least partially arranged between the end cover and the main body, the current collecting component comprises a terminal connecting part and a tab connecting part, the terminal connecting part is used for connecting an electrode terminal, and the tab connecting part is used for connecting a tab; and the protection structure is arranged between the tab and the tab connecting part so as to isolate at least partial region of the tab from the tab connecting part.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] In the development of battery technology, the reliability of batteries is an issue that cannot be ignored. Therefore, how to enhance the reliability of batteries is a technical problem that needs to be solved urgently in battery technology. Utility Model Content

[0004] In view of the problems existing in the background technology, the embodiments of the present application provide a battery cell, a battery and an electrical device, aiming to improve the reliability of the battery.

[0005] In the first aspect, the embodiment of the present application provides a battery cell, which includes a shell, an electrode terminal, an electrode assembly, a current collecting component, and a protective structure. The shell includes a wall portion; the electrode terminal is insulated and installed on the wall portion, and the wall portion of the shell on which the electrode terminal is installed is called an end cap; the electrode assembly is accommodated in the shell, and the electrode assembly includes a main body and a pole ear extending from the main body, and the pole ear is formed at one end of the main body close to the end cap; the current collecting component is at least partially arranged between the end cap and the main body, and the current collecting component includes a terminal connecting portion and a pole ear connecting portion, the terminal connecting portion is used to connect the electrode terminal, and the pole ear connecting portion is used to connect the pole ear; the protective structure is arranged between the pole ear and the pole ear connecting portion to isolate at least a part of the pole ear from the pole ear connecting portion.

[0006] In the above scheme, the protective structure is arranged between the pole ear and the pole ear connecting part, isolating the edge corner area of ​​the pole ear and the pole ear connecting part, reducing the risk of the pole ear being damaged due to contact friction in the edge corner area of ​​the pole ear and the pole ear connecting part, and improving the reliability of the battery cell.

[0007] In some embodiments, in the thickness direction of the end cover, the tab connection portion is farther away from the end cover than the terminal connection portion, so that a gap is formed between the tab connection portion and the end cover, and the tab is at least partially accommodated in the gap after being bent.

[0008] In the above scheme, in the thickness direction of the end cover, when the space occupied by the bent pole ear is certain, the gap between the pole ear connecting part and the end cover is used to accommodate part of the pole ear, which will not occupy the internal space of the battery cell additionally, thereby improving the energy density of the battery cell.

[0009] In some embodiments, the tab connection portion includes a first surface facing the end cover and a second surface facing away from the end cover, and a third surface connected to the first surface and the second surface; a gap is formed between the first surface and the end cover, and the tab is welded to the first surface.

[0010] In the above solution, at least part of the tab is accommodated in the gap formed between the first surface and the end cover, which reduces the occupation of the tab by the internal space of the battery cell, and is conducive to improving the energy density of the battery cell. At the same time, the tab is welded to the first surface, and the tab connection portion can support the tab, reducing the risk of the tab being inserted into the main body and causing a short circuit inside the battery cell.

[0011] In some embodiments, the electrode ear includes a main body connecting portion, which is located between the main body and the second surface and is used to connect the main body; a current collecting component connecting portion, which is accommodated in the gap and welded to the first surface; and a bending portion, which is used to connect the main body connecting portion and the current collecting component connecting portion and is bent around the third surface.

[0012] In the above scheme, the above design enables the main body, the main body connecting part, the bending part, the current collecting component connecting part, and the first surface to be connected in sequence and realize electrical connection. The pole ear is bent as a whole and forms a pole ear space to accommodate the pole ear connecting part. The pole ear connecting part is located in the bent pole ear space, which reduces the battery cell space additionally occupied by the pole ear connecting part and improves the energy density of the battery cell.

[0013] In some embodiments, the protective structure includes a first isolation portion, which is arranged between the current collecting component connection portion and the first surface, and is used to isolate at least part of the current collecting component connection portion from the first surface; a second isolation portion, which is arranged between the main body connection portion and the second surface, and is used to isolate at least part of the main body connection portion from the second surface; a third isolation portion, which is arranged between the bending portion and the third surface, and the two ends of the third isolation portion are respectively connected to the first isolation portion and the second isolation portion, and the third isolation portion is used to isolate the bending portion from the third surface.

[0014] In the above scheme, the protective structure can completely separate the edge corner areas formed by the first surface, the second surface and the third surface of the pole ear and the pole ear connecting part, reducing the risk of direct contact between the edge corner areas of the pole ear and the pole ear connecting part, and can effectively protect the pole ear.

[0015] In some embodiments, the protective structure is arranged on the pole ear, wherein the first isolation portion is arranged on the side of the current collecting component connecting portion facing the first surface, the second isolation portion is arranged on the side of the main body connecting portion facing the second surface, and the third isolation portion is arranged on the side of the bending portion facing the third surface.

[0016] In the above solution, the protective structure is arranged on the pole ear so that the edge corner area of ​​the pole ear and the pole ear connection part are completely separated, reducing contact friction, thereby protecting the pole ear and preventing the pole ear from being damaged. At the same time, the size of the protective structure can also be adjusted according to the size of the pole ear to adapt to battery cells of different sizes.

[0017] In some embodiments, the protection structure is disposed on the tab connection portion, wherein the first isolation portion is disposed on the first surface, the second isolation portion is disposed on the second surface, and the third isolation portion is disposed on the third surface.

[0018] In the above scheme, the protective structure is arranged at the pole ear connection part, which can cover the edge corner area formed by the first surface, the second surface and the third surface that will come into direct contact with the pole ear, thereby avoiding direct contact between the pole ear and the edge corner area of ​​the pole ear connection part, reducing the risk of direct contact, and achieving the purpose of protecting the pole ear.

[0019] In some embodiments, the current collecting member connection portion is welded to the first surface, and weld print areas are formed on the first surface and the second surface respectively; there is a gap between the first isolation portion and the weld print area of ​​the first surface in the width direction of the end cover.

[0020] In the above solution, there is a distance between the first isolating portion and the weld mark area of ​​the first surface in the width direction of the end cover to avoid the weld mark area and prevent the protective structure from interfering with the weld mark area, resulting in poor welding between the tabs and the tab connecting parts.

[0021] In some embodiments, a projection of the second isolation portion on the second surface covers a weld print area of ​​the second surface.

[0022] In the above scheme, the size of the second isolating portion in the width direction of the end cover is sufficient to ensure that the projection of the second isolating portion on the second surface completely covers the weld mark area of ​​the second surface, so that the second isolating portion can block the welding slag that may be generated by welding at the pole ear connection part, thereby reducing the risk of the welding slag falling into the main body and causing a short circuit in the main body.

[0023] In some embodiments, the thickness of the protective structure is T, satisfying 0.03 mm ≤ T ≤ 0.1 mm.

[0024] In the above scheme, when the thickness of the protective structure is less than 0.03mm, the protective structure is too thin and can be easily cut by the edge corner area of ​​the tab connection, and cannot effectively protect the tab. When the thickness of the protective structure is greater than 0.1mm, the protective structure is too thick and will excessively occupy the internal space of the battery cell, reducing the energy density of the battery cell.

[0025] In some embodiments, two ends of the protection structure extend beyond two ends of the electrode ear in the length direction of the end cap.

[0026] In the above scheme, the two ends of the protective structure extend beyond the two ends of the pole ear in the length direction of the end cover, so that the size of the protective structure is sufficient to completely isolate the edge corner area of ​​the pole ear and the pole ear connection part, thereby reducing the risk of direct contact between the edge corner area of ​​the pole ear and the pole ear connection part, effectively protecting the pole ear and avoiding damage to the pole ear.

[0027] In some embodiments, the third surface is an arc-shaped surface, and the bending portion is bent around the third surface and abuts against it.

[0028] In the above scheme, the third surface is an arc-shaped surface, and the edge corner area of ​​the pole ear connection portion forms a smooth transition. When the bent portion abuts against the third surface, the edge corner area of ​​the pole ear connection portion will not cut the pole ear due to contact friction. At the same time, the bent portion abuts against the third surface, and the pole ear connection portion can support the pole ear to prevent the pole ear from being inserted into the main body and causing a short circuit in the electrode assembly.

[0029] In some embodiments, an opening is formed at one end of the shell, and the electrode assembly is accommodated in the shell through the opening; the wall portion provided with the electrode terminal is called an end cover, and the end cover is used to close the opening.

[0030] In the above scheme, an opening is formed at one end of the shell, and the electrode assembly is accommodated in the shell through the opening. The wall portion provided with the electrode terminal is also called an end cover, which is used to close the shell opening so that the shell forms a closed space closed to the outside. The shell is formed by enclosing multiple walls, and the electrode terminal can be set in any wall portion to meet different production and manufacturing requirements.

[0031] In a second aspect, an embodiment of the present application provides a battery, comprising a housing and the battery cells mentioned in any of the above embodiments, wherein the housing is used to accommodate the battery cells.

[0032] In a third aspect, an embodiment of the present application provides an electrical device, comprising a battery provided by any embodiment of the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application and constitute a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0034] In the attached picture:

[0035] Figure 1 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application;

[0036] Figure 2 A schematic diagram of the exploded structure of a battery provided in an embodiment of the present application;

[0037] Figure 3 A schematic diagram of the exploded structure of a battery cell provided in an embodiment of the present application;

[0038] Figure 4 A schematic diagram of the structure of a current collecting component provided in an embodiment of the present application;

[0039] Figure 5 A schematic diagram of welding the electrode tab and the current collecting component provided in an embodiment of the present application;

[0040] Figure 6 A cross-sectional view of a battery cell provided in an embodiment of the present application along the length direction of the end cover;

[0041] Figure 7 for Figure 6 A partial enlarged view of a cross-sectional view of a battery cell at position B shown;

[0042] Figure 8 A cross-sectional view of a battery cell provided in an embodiment of the present application along the width direction of the end cover;

[0043] Fig. 9 for Figure 8 A partial enlarged view of a cross-sectional view of a battery cell at position C shown;

[0044] Fig.10 A schematic diagram of a protective structure provided in an embodiment of the present application being arranged at a connection portion of a tab;

[0045] Fig.11 A schematic structural diagram of another current collecting component provided in an embodiment of the present application.

[0046] Icons: vehicle 1000, battery 100, case 10, upper case 11, lower case 12, controller 200, motor 300, battery cell 20, shell 401, wall 402, electrode terminal 403, end cover 404, opening 405, electrode assembly 501, main body 510, pole ear 520, current collecting member 601, terminal connecting portion 610, pole ear connecting portion 620, first surface 621, second surface 622, third surface 623, gap 101, protective structure 102, first isolating portion 103, second isolating portion 104, third isolating portion 105, main body connecting portion 521, current collecting member connecting portion 522, bending portion 523, weld stamping area 524, length direction X, width direction Y, thickness direction Z. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0048] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including", "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0049] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0050] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", and "attach" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or two elements can be internally connected. For ordinary technicians in this field, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0051] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0052] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of each component in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0053] The term "plurality" used in the present application refers to two or more (including two).

[0054] In the present application, the battery cell may include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery or a magnesium-ion battery, etc., and the embodiments of the present application do not limit this. The battery cell may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this. The battery cell may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this.

[0055] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack. The battery generally includes a box for encapsulating one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0056] The battery cell includes an electrode assembly and an electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. The positive electrode collector not coated with the positive electrode active material layer serves as the positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide. The negative electrode sheet includes a negative electrode collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode collector. The negative electrode collector not coated with the negative electrode active material layer protrudes from the negative electrode collector coated with the negative electrode active material layer. The negative electrode collector not coated with the negative electrode active material layer serves as the negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material layer may be carbon or silicon, etc. In order to ensure that a large current can pass without melting, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. The material of the isolation film may be PP (ploypropylene, polypropylene) or PE (polyethylene, polyethylene), etc. In addition, the electrode assembly may be a winding structure or a laminated structure, and the embodiments of the present application are not limited thereto.

[0057] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0058] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including", "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0059] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0060] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", and "attach" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or two elements can be internally connected. For ordinary technicians in this field, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0061] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0062] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of each component in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0063] The term "plurality" used in the present application refers to two or more (including two).

[0064] In the present application, the battery cell may include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery or a magnesium-ion battery, etc., and the embodiments of the present application do not limit this. The battery cell may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this. The battery cell may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this.

[0065] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack. The battery generally includes a box for encapsulating one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0066] The battery cell includes an electrode assembly and an electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. The positive electrode collector not coated with the positive electrode active material layer serves as the positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide. The negative electrode sheet includes a negative electrode collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode collector. The negative electrode collector not coated with the negative electrode active material layer protrudes from the negative electrode collector coated with the negative electrode active material layer. The negative electrode collector not coated with the negative electrode active material layer serves as the negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material layer may be carbon or silicon, etc. In order to ensure that a large current can pass without melting, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. The material of the isolation film may be PP (ploypropylene, polypropylene) or PE (polyethylene, polyethylene), etc. In addition, the electrode assembly may be a winding structure or a laminated structure, and the embodiments of the present application are not limited thereto.

[0067] The battery cell also includes a shell, which includes a wall, and the electrode terminal is arranged on the wall. The electrode terminal is electrically connected to the pole ear through the current collecting member. In order to improve the energy density of the battery cell, the pole ear is connected to the side of the current collecting member facing the wall, and part of the pole ear is accommodated in the gap between the current collecting member and the wall. However, in this way, the bending part of the pole ear will produce contact friction with the edge corner area of ​​the current collecting member. Since the pole ear is very thin, this contact friction can easily cause damage to the pole ear during the production and use of the battery cell, causing electrical performance failure.

[0068] In view of this, the embodiment of the present application provides a technical solution, the battery cell includes a shell, the shell includes a wall portion; the electrode terminal is insulated and installed on the wall portion; the electrode assembly is arranged in the shell, the electrode assembly includes a main body and a pole ear extending from the main body, the pole ear is formed at one end of the main body close to the wall portion; the current collecting component, the current collecting component is at least partially arranged between the wall portion and the main body, the current collecting component includes a terminal connecting portion and a pole ear connecting portion, the terminal connecting portion is used to connect the electrode terminal, and the pole ear connecting portion is used to connect the pole ear; the protective structure is arranged between the pole ear and the pole ear connecting portion to isolate at least a part of the pole ear from the pole ear connecting portion. The technical solution provided by the embodiment of the present application can reduce the contact friction between the pole ear and the current collecting component to protect the pole ear and avoid pole ear damage.

[0069] The battery cells and batteries disclosed in the embodiments of the present application can be used in electrical devices to form a power supply system of the electrical devices, which is helpful to improve the safety of the electrical devices.

[0070] The electrical device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, and the like; the spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, and the like; the electric toy includes a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0071] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0072] See also Figure 1 , Figure 1This is a schematic diagram of the structure of a vehicle 1000 disclosed in some embodiments of the present application. A battery 100 is disposed inside the vehicle 1000. The battery 100 may be disposed at the bottom, head, or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000. For example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, to meet the power requirements for starting, navigating, and driving the vehicle 1000.

[0073] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0074] In some embodiments, see Figure 2 , Figure 2 The schematic diagram of the structure of the battery 100 provided in some embodiments of the present application includes a box 10 and a battery cell 20, and the box 10 is used to accommodate the battery cell 20. The box 10 can adopt a variety of structures. In some embodiments, the box 10 can include an upper box 11 and a lower box 12. The upper box 11 and the lower box 12 cover each other, and the upper box 11 and the lower box 12 jointly define a storage space for accommodating the battery cell 20. The lower box 12 can be a hollow structure with one end open, and the upper box 11 can be a plate-like structure. The upper box 11 covers the open side of the lower box 12, so that the upper box 11 and the lower box 12 jointly define a storage space; the upper box 11 and the lower box 12 can also be hollow structures with one side open, and the open side of the upper box 11 covers the open side of the lower box 12. Of course, the box 10 formed by the upper box 11 and the lower box 12 can be in a variety of shapes, such as a cylinder, a cuboid, etc.

[0075] The battery 100 mentioned in the embodiment of the present application refers to a single physical module including one or more battery cells 20 to provide higher voltage and capacity. For example, the battery 100 mentioned in the present application may include a battery module or a battery pack, etc. There may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in mixed connection. Mixed connection means that multiple battery cells 20 are both connected in series and in parallel. Multiple battery cells 20 can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10; of course, it is also possible that multiple battery cells 20 are first connected in series, in parallel, or in mixed connection to form a battery 100 in the form of a battery module, and multiple battery modules are then connected in series, in parallel, or in mixed connection to form a whole, and are accommodated in the box 10. The battery 100 may also include other structures. For example, the battery 100 may also include a confluence component for realizing electrical connection between multiple battery cells 20.

[0076] Each battery cell 20 can be a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery or a magnesium ion battery, but is not limited thereto. The battery cell 20 can be cylindrical, flat, rectangular or other shapes.

[0077] See also Figure 3 , the present application discloses a battery cell 20 . Figure 3 4 is a schematic diagram of the structure of a battery cell 20 disclosed in some embodiments of the present application. The battery cell 20 includes a housing 401 , an electrode terminal 403 , an electrode assembly 501 , a current collecting member 601 , and a protective structure 102 . The shell 401 includes a wall portion 402; the electrode terminal 403 is insulated and installed on the wall portion 402, and the wall portion 402 of the shell 401 on which the electrode terminal 403 is installed is called the end cover 404; the electrode assembly 501 is accommodated in the shell 401, and the electrode assembly 501 includes a main body 510 and a pole ear 520 extending from the main body 510, and the pole ear 520 is formed at one end of the main body 510 close to the end cover 404; the current collecting component 601 is at least partially arranged between the end cover 404 and the main body 510, and the current collecting component 601 includes a terminal connecting portion 610 and a pole ear connecting portion 620, the terminal connecting portion 610 is used to connect the electrode terminal 403, and the pole ear connecting portion 620 is used to connect the pole ear 520; the protective structure 102 is arranged between the pole ear 520 and the pole ear connecting portion 620 to isolate at least a partial area of ​​the pole ear 520 from the pole ear connecting portion 620.

[0078] The housing 401 is composed of a plurality of walls 402, which enclose a closed space for accommodating the electrode assembly 501. The closed space can also accommodate electrolytes, such as electrolytes. The connection and sealing between the plurality of walls 402 can be achieved by welding or the like.

[0079] The shell 401 may be in various shapes, such as a cylinder, a cuboid, etc. The shape of the shell 401 may be determined according to the specific shape of the electrode assembly 501. For example, if the electrode assembly 501 is a cylindrical structure, the shell 401 may be a cylindrical structure; if the electrode assembly 501 is a cuboid structure, the shell 401 may be a cuboid structure. Figure 3 In the embodiment, the housing 401 is illustratively a rectangular parallelepiped structure.

[0080] The shell 401 may be made of various materials. For example, the shell 401 may be made of materials including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, and the like.

[0081] The electrode terminal 403 can be installed on any wall 402. The wall 402 on which the electrode terminal 403 is installed in the battery cell 20 is called the end cap 404. The shape of the end cap 404 can be adapted to the shape of the shell 401 to match the shell 401. The material of the end cap 404 can be the same as or different from the material of the shell 401. Optionally, the end cap 404 can be made of a material with a certain hardness and strength (for example, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.), so that the end cap 404 is not easily deformed when squeezed and collided, so that the battery cell 20 can have a higher structural strength and the reliability performance can also be improved. When the material of the end cap 404 is a conductive material such as copper or aluminum, an insulating member is provided between the contact surface of the end cap 404 and the electrode terminal 403 to isolate the electrode terminal 403 and the end cap 404, thereby reducing the risk of short circuit.

[0082] The end cover 404 is connected to the housing 401 by welding, bonding, clamping or other methods.

[0083] The housing 401 may be open at one end or at both ends. In some examples, the housing 401 may be a structure with one end open, and one end cap 404 is provided and covers the housing 401. In other examples, the housing 401 may be a structure with two ends open, and two end caps 404 are provided, and the two end caps 404 cover the two openings of the housing 401 respectively.

[0084] The main body 510 of the electrode assembly 501 is composed of a positive electrode sheet, a negative electrode sheet and a separator, and the main body 510 can be formed by winding, stacking, rolling, etc. The tabs 520 of the electrode assembly 501 include a positive tab and a negative tab, which are collectively referred to as tabs 520 below.

[0085] The electrode assembly 501 is contained in the housing 401, and the number of the electrode assembly 501 can be one or more. Figure 3 In the embodiment, there are two electrode assemblies 501 housed in the shell 401.

[0086] The tab 520 extends from the main body 510 and is formed at one end of the main body 510 close to the end cover 404 so as to be electrically connected to the electrode terminal 403 for inputting or outputting electric energy.

[0087] The current collecting member 601 is used to realize the electrical connection between the pole tab 520 and the electrode terminal 403. When the pole tab 520 is connected to the current collecting member 601, ultrasonic pre-welding can be performed in advance to strengthen the strength of the pole tabs 520520. The terminal connecting portion 610 of the current collecting member 601 and the electrode terminal 403 can be connected by laser welding or ultrasonic welding, and the pole tab connecting portion 620 and the pole tab 520 can also be connected by ultrasonic welding or laser welding to ensure the firmness of the connection.

[0088] The current collecting member 601 may be a metal conductor, for example, copper, iron, aluminum, alloy, or the like.

[0089] The material of the terminal connection portion 610 and the material of the tab connection portion 620 in the current collecting member 601 may be the same or different.

[0090] The current collecting member 601 includes a tab connection portion 620 and a terminal connection portion 610 . The terminal connection portion 610 is a boss protruding from the surface of the current collecting member 601 . The material of the boss may be a metal conductor to facilitate electrical connection with the electrode terminal 403 .

[0091] The shape of the boss can be a circular boss, a square boss, etc., and the size of the contact area between the boss and the electrode terminal 403 meets the welding connection requirements of the electrode terminal 403.

[0092] The protective structure 102 may be a polyester polymer having good mechanical ductility, flexibility and heat resistance, such as Mylar film, etc. The protective structure 102 is disposed between the tab 520 and the tab connection portion 620, and may be bonded or hot-melted to either or both of the tab 520 or the tab connection portion 620 to isolate at least a portion of the tab 520 from the edge corner region of the tab connection portion 620.

[0093] According to the embodiment of the present application, since the pole lug connection portion 620 is relatively thin, the edges of the edge corner area are sharp, and the single-layer pole lug 520 itself is also very thin, the protective structure 102 is arranged between the pole lug 520 and the pole lug connection portion 620, and the pole lug 520 is isolated from the edge corner area of ​​the pole lug connection portion 620, thereby reducing the risk of damage to the pole lug 520 caused by contact friction between the edge corner area of ​​the pole lug 520 and the pole lug connection portion 620, thereby improving the reliability of the battery cell 20.

[0094] In some embodiments, please refer to Figure 4-Figure 7In the thickness direction Z of the end cover 404 , the tab connection portion 620 is further away from the end cover 404 than the terminal connection portion 610 , so that a gap 101 is formed between the tab connection portion 620 and the end cover 404 , and the tab 520 is at least partially accommodated in the gap 101 after being bent.

[0095] In the thickness direction Z of the end cover 404, since the terminal connection part 610 protrudes from the pole tab connection part 620 and is electrically connected to the electrode terminal 403, a gap 101 is formed between the pole tab connection part 620 and the end cover 404, and the pole tab 520 can be at least partially accommodated in the gap 101 after being bent.

[0096] According to an embodiment of the present application, in the thickness direction Z of the end cover 404, when the space occupied by the pole ear 520 after being bent is certain, the gap 101 between the pole ear connecting portion 620 and the end cover 404 is used to accommodate part of the pole ear 520, and no additional internal space of the battery cell 20 is occupied, thereby improving the energy density of the battery cell 20.

[0097] In some embodiments, see Figure 4 and Figure 5 , Figure 4 This is a schematic diagram of the structure of the current collecting component 601 provided in an embodiment of the present application. Figure 5 Schematic diagram of welding the pole tab 520 and the current collecting member 601 provided in an embodiment of the present application. The pole tab connection portion 620 includes a first surface 621 facing the end cover 404 and a second surface 622 facing away from the end cover 404, and a third surface 623 connected to the first surface 621 and the second surface 622; a gap 101 is formed between the first surface 621 and the end cover 404, and the pole tab 520 is welded to the first surface 621.

[0098] According to the embodiment of the present application, at least part of the tab 520 is accommodated in the gap 101 formed between the first surface 621 and the end cover 404, which reduces the occupation of the tab 520 in the internal space of the battery cell 20, and is conducive to improving the energy density of the battery cell 20. At the same time, the tab 520 is welded to the first surface 621, and the tab connection portion 620 can support the tab 520, reducing the risk of the tab 520 being inserted into the body 510 and causing an internal short circuit in the battery cell 20.

[0099] In some embodiments, see Figure 8 and Fig. 9 , Figure 8 This is a cross-sectional view of the battery cell 20 provided in the embodiment of the present application along the width direction Y of the end cover 404. Fig. 9 for Figure 8The illustrated partial enlarged view of the cross-sectional view of the battery cell 20. The tab 520 includes a main body connection portion 521, which is located between the main body 510 and the second surface 622 and is used to connect the main body 510; a current collecting member connection portion 522, which is accommodated in the gap 101 and welded to the first surface 621; and a bending portion 523, which is used to connect the main body connection portion 521 and the current collecting member connection portion 522, and is bent around the third surface 623.

[0100] According to the embodiments of the present application, the above-mentioned design enables the main body 510, the main body connection portion 521, the bending portion 523, the current collecting component connection portion 522, and the first surface 621 to be connected in sequence and realize electrical connection. The pole lug 520 is bent as a whole, and a pole lug space for accommodating the pole lug connection portion 620 is formed. The pole lug connection portion 620 is located in the bent pole lug space, which reduces the extra space of the battery cell 20 occupied by the pole lug connection portion 620 and improves the energy density of the battery cell 20.

[0101] In some embodiments, see Figure 8 and Fig. 9 The protective structure 102 includes a first isolating portion 103, which is arranged between the current collecting component connecting portion 522 and the first surface 621, and is used to isolate at least part of the current collecting component connecting portion 522 from the first surface 621; a second isolating portion 104, which is arranged between the main body connecting portion 521 and the second surface 622, and is used to isolate at least part of the main body connecting portion 521 from the second surface 622; a third isolating portion 105, which is arranged between the bending portion 523 and the third surface 623, and the two ends of the third isolating portion 105 are respectively connected to the first isolating portion 103 and the second isolating portion 104, and the third isolating portion 105 is used to isolate the bending portion 523 from the third surface 623.

[0102] According to the embodiment of the present application, the protective structure 102 includes a first isolating portion 103, a second isolating portion 104, and a third isolating portion 105, which are arranged one by one corresponding to the current collecting component connecting portion 522, the main body connecting portion 521, and the bending portion 523. The edge corner area formed by the first surface 621, the second surface 622, and the third surface 623 of the pole ear 520 and the pole ear connecting portion 620 can be completely separated, thereby reducing the risk of direct contact between the pole ear 520 and the edge corner area of ​​the pole ear connecting portion 620, and effectively protecting the pole ear 520.

[0103] In some embodiments, see Figure 6-Figure 9The protective structure 102 is arranged on the pole ear 520, wherein the first isolating portion 103 is arranged on the side of the current collecting component connecting portion 522 facing the first surface 621, the second isolating portion 104 is arranged on the side of the main body connecting portion 521 facing the second surface 622, and the third isolating portion 105 is arranged on the side of the bending portion 523 facing the third surface 623.

[0104] According to the embodiment of the present application, the protective structure 102 is disposed on the tab 520, and can be bonded or hot-melted to form an integral structure with the tab 520, so that the edge corner area of ​​the tab 520 and the tab connection portion 620 are completely separated, reducing contact friction, thereby protecting the tab 520 and preventing damage to the tab 520. At the same time, the size of the protective structure 102 can also be adjusted according to the size of the tab 520 to accommodate battery cells 20 of different sizes.

[0105] In some embodiments, see Fig.10 , Fig.10 The protective structure 102 provided in the embodiment of the present application is a schematic diagram arranged on the pole ear connection portion 620, wherein the protective structure 102 is arranged on the pole ear connection portion 620, wherein the first isolation portion 103 is arranged on the first surface 621, the second isolation portion 104 is arranged on the second surface 622, and the third isolation portion 105 is arranged on the third surface 623.

[0106] According to an embodiment of the present application, the protective structure 102 is arranged at the pole ear connecting portion 620, and can cover the edge corner area formed by the first surface 621, the second surface 622 and the third surface 623 that will come into direct contact with the pole ear 520, thereby avoiding direct contact between the pole ear 520 and the edge corner area of ​​the pole ear connecting portion 620, reducing the risk of direct contact, and achieving the purpose of protecting the pole ear 520.

[0107] In some embodiments, see Figure 5 , Figure 5 A schematic diagram of welding the electrode ear 520 and the current collecting component 601 provided in an embodiment of the present application, wherein the current collecting component connecting portion 522 is welded to the first surface 621, and weld print areas 524 are formed on the first surface 621 and the second surface 622, respectively; there is a spacing between the first isolating portion 103 and the weld print area 524 of the first surface 621 in the width direction Y of the end cover 404.

[0108] The current collecting component connection portion 522 and the pole lug connection portion 620 are generally connected by ultrasonic welding. After the current collecting component connection portion 522 is welded to the pole lug connection portion 620, corresponding weld print areas 524 will be formed on the first surface 621 and the second surface 622. The shapes of the weld print areas 524 are different depending on the welding method. For example, in the embodiment of the present application, the current collecting component connection portion 522 is welded to the pole lug connection portion 620 by ultrasonic welding, and the weld print areas 524 formed therefrom are arranged in a dot array. The specific shape of the weld print areas 524 formed may be a rectangle, a trapezoid, etc.

[0109] The distance between the first isolating portion 103 and the weld print area 524 of the first surface 621 in the width direction Y of the end cover 404 meets the distance requirement for welding the current collecting member connecting portion 522 to the tab connecting portion 620 .

[0110] According to an embodiment of the present application, there is a distance between the first isolation portion 103 and the weld print area 524 of the first surface 621 in the width direction Y of the end cover 404 to avoid the weld print area 524 and prevent the protective structure 102 from interfering with the weld print area 524 and causing poor welding between the pole ear 520 and the pole ear connecting portion 620.

[0111] In some embodiments, the projection of the second isolation portion 104 on the second surface 622 covers the weld print area 524 of the second surface 622 .

[0112] According to the embodiment of the present application, the size of the second isolation portion 104 in the width direction Y of the end cover 404 is sufficient to ensure that the projection of the second isolation portion 104 on the second surface 622 completely covers the weld print area 524 of the second surface 622, so that the second isolation portion 104 can block the welding slag that may be generated by welding of the pole ear connecting portion 620, thereby reducing the risk of the welding slag falling into the main body 510 and causing a short circuit in the main body 510.

[0113] In some embodiments, the thickness of the protection structure 102 is T, satisfying 0.03 mm ≤ T ≤ 0.1 mm.

[0114] According to the embodiment of the present application, when the thickness of the protective structure 102 is less than 0.03 mm, the protective structure 102 is too thin and is easily cut by the edge corner area of ​​the tab connection portion 620, and cannot effectively protect the tab 520. When the thickness of the protective structure 102 is greater than 0.1 mm, the protective structure 102 is too thick and will excessively occupy the internal space of the battery cell 20, thereby reducing the energy density of the battery cell 20.

[0115] In some embodiments, see Figure 5 , both ends of the protection structure 102 extend beyond both ends of the pole ear 520 in the length direction X of the end cover 404 .

[0116] According to an embodiment of the present application, the two ends of the protective structure 102 extend beyond the two ends of the pole lug 520 in the length direction X of the end cover 404, so that the size of the protective structure 102 is sufficient to completely isolate the edge corner area of ​​the pole lug 520 from the pole lug connecting portion 620, thereby reducing the risk of direct contact between the edge corner area of ​​the pole lug 520 and the pole lug connecting portion 620, effectively protecting the pole lug 520, and avoiding damage to the pole lug 520.

[0117] In some embodiments, see Fig.11 , Fig.11 This is a schematic structural diagram of another current collecting component 601 provided in an embodiment of the present application. The third surface 623 is an arc-shaped surface, and the bending portion 523 is bent around the third surface 623 and abuts against it.

[0118] According to an embodiment of the present application, the third surface 623 is an arc-shaped surface, and the edge corner area of ​​the pole ear connection portion 620 forms a smooth transition. When the bending portion 523 abuts against the third surface 623, the edge corner area of ​​the pole ear connection portion 620 will not cut the pole ear 520 due to contact friction. At the same time, the bending portion 523 abuts against the third surface 623, and the pole ear connection portion 620 can support the pole ear 520 to prevent the pole ear 520 from being inserted into the main body 510 and causing a short circuit in the electrode assembly 501.

[0119] In some embodiments, an opening 405 is formed at one end of the shell 401 , and the electrode assembly 501 is accommodated in the shell 401 through the opening 405 ; the wall portion 402 provided with the electrode terminal 403 is called an end cover 404 , which is used to close the opening 405 .

[0120] According to the embodiment of the present application, an opening 405 is formed at one end of the housing 401, and the electrode assembly 501 is accommodated in the housing 401 through the opening 405. The wall portion 402 provided with the electrode terminal 403 is also called an end cap 404. The end cap 404 is used to close the opening 405 of the housing 401, so that the housing 401 forms a closed space closed relative to the outside. The housing 401 is formed by enclosing a plurality of walls 402, and the electrode terminal 403 can be provided in any wall portion 402 to meet different production and manufacturing requirements.

[0121] According to some embodiments proposed in the present application, a battery 100 is further proposed. The battery 100 includes a housing 10 and the battery cells 20 mentioned in any of the above embodiments. The housing 10 is used to accommodate the battery cells 20 .

[0122] According to some embodiments proposed in the present application, an electric device is also provided, the electric device includes the battery 100 proposed in the above embodiments, and the battery 100 is used to provide electric energy for the electric device. The electric device can be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft can include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0123] According to some embodiments of the present application, the present application provides a battery cell 20, which includes a shell 401, an electrode terminal 403, an electrode assembly 501, a current collecting member 601 and a protective structure 102. The shell 401 includes a wall portion 402, and the electrode terminal 403 is insulated and installed on the wall portion 402. The wall portion 402 of the battery cell 20 on which the electrode terminal 403 is installed is also called an end cap 404. The electrode assembly 501 is disposed in the shell 401. The electrode assembly 501 includes a main body 510 and a pole ear 520 extending from the main body 510. The pole ear 520 is formed at one end of the main body 510 close to the end cap 404. The pole ear 520 includes a main body connecting portion 521, a current collecting member connecting portion 522 and a bending portion 523. The current collecting component connection portion 522 is at least partially disposed between the end cover 404 and the main body 510. The current collecting component 601 includes a terminal connection portion 610 and a tab connection portion 620. The tab connection portion 620 includes a first surface 621 facing the end cover 404 and a second surface 622 facing away from the end cover 404, and a third surface 623 connected to the first surface 621 and the second surface 622. In the thickness direction Z of the end cover 404, there is a gap 101 between the first surface 621 and the end cover 404. The tab 520 is at least partially accommodated in the gap 101 after being bent, and the current collecting component connection portion 522 is welded to the first surface 621. The protective structure 102 is arranged between the pole ear 520 and the pole ear connecting portion 620, and the protective structure 102 includes a first isolating portion 103, a second isolating portion 104, and a third isolating portion 105. The first isolating portion 103 is arranged between the current collecting component connecting portion 522 and the first surface 621, the second isolating portion 104 is arranged between the main body connecting portion 521 and the second surface 622, and the third isolating portion 105 is arranged between the bending portion 523 and the third surface 623. The protective structure 102 can isolate the edge corner area formed by the first surface 621, the second surface 622 and the third surface 623 of the pole ear connecting portion 620, avoid direct contact between the pole ear 520 and the edge corner area of ​​the pole ear connecting portion 620, protect the pole ear 520, reduce the risk of damage to the pole ear 520, and improve the reliability of the battery 100.

[0124] 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 make equivalent substitutions for the technical solutions described in the aforementioned embodiments, but these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cell, characterized in that: include: A housing, including a wall portion; An electrode terminal, insulated and mounted on the wall; An electrode assembly is contained in the housing, the electrode assembly comprising a main body and a pole ear extending from the main body, the pole ear being formed at one end of the main body close to the wall portion; A current collecting member, the current collecting member is at least partially disposed between the wall portion and the main body, the current collecting member comprises a terminal connecting portion and a tab connecting portion, the terminal connecting portion is used to connect the electrode terminal, and the tab connecting portion is used to connect the tab; A protection structure is disposed between the pole lug and the pole lug connecting portion to isolate at least a portion of the pole lug from the pole lug connecting portion.

2. The battery cell according to claim 1, characterized in that: In the thickness direction of the wall portion, the tab connection portion is farther away from the wall portion than the terminal connection portion, so that a gap is formed between the tab connection portion and the wall portion, and the tab is at least partially accommodated in the gap after being bent.

3. The battery cell according to claim 2, characterized in that: The tab connection portion includes a first surface facing the wall portion, a second surface facing away from the wall portion, and a third surface connected to the first surface and the second surface. The gap is formed between the first surface and the wall portion, and the tab is welded to the first surface.

4. The battery cell according to claim 3, characterized in that: The tab comprises: a main body connecting portion, the main body connecting portion being located between the main body and the second surface and used for connecting the main body; a current collecting member connecting portion, the current collecting member connecting portion being received in the gap and welded to the first surface; A bending portion is used to connect the main body connection portion and the current collecting member connection portion, and is bent around the third surface.

5. The battery cell according to claim 4, characterized in that: The protection structure comprises: a first isolating portion, the first isolating portion being disposed between the current collecting component connecting portion and the first surface and being used to isolate at least a portion of the current collecting component connecting portion from the first surface; a second isolating portion, the second isolating portion being disposed between the main body connecting portion and the second surface and being used to isolate at least a portion of the main body connecting portion from the second surface; A third isolation portion, wherein the third isolation portion is disposed between the bending portion and the third surface, and two ends of the third isolation portion are respectively connected to the first isolation portion and the second isolation portion, and the third isolation portion is used to isolate the bending portion from the third surface.

6. The battery cell according to claim 5, characterized in that: The protective structure is arranged on the pole ear, wherein the first isolating portion is arranged on the side of the current collecting component connecting portion facing the first surface, the second isolating portion is arranged on the side of the main body connecting portion facing the second surface, and the third isolating portion is arranged on the side of the bending portion facing the third surface.

7. The battery cell according to claim 5, characterized in that: The protective structure is disposed on the tab connecting portion, wherein the first isolation portion is disposed on the first surface, the second isolation portion is disposed on the second surface, and the third isolation portion is disposed on the third surface.

8. The battery cell according to claim 5, characterized in that: The current collecting component connecting portion is welded to the first surface, and welding marks are formed on the first surface and the second surface respectively; There is a distance between the first isolation portion and the weld print area of ​​the first surface in the width direction of the wall portion.

9. The battery cell according to claim 8, characterized in that: The projection of the second isolation portion located on the second surface covers the weld print area of ​​the second surface.

10. The battery cell according to claim 1, characterized in that: The thickness of the protective structure is T, satisfying 0.03mm≤T≤0.1mm.

11. The battery cell according to claim 1, characterized in that: Both ends of the protection structure extend beyond both ends of the tab in the length direction of the wall portion.

12. The battery cell according to claim 4, characterized in that: The third surface is an arc-shaped surface, and the bending portion is bent around the third surface and is disposed against it.

13. The battery cell according to claim 1, characterized in that: An opening is formed at one end of the shell, and the electrode assembly is accommodated in the shell through the opening; an end cap, the end cap closing the opening; Wherein, the end cover is the wall portion.

14. A battery, characterized in that: include: The battery cell according to any one of claims 1 to 13, and; The box body is used to accommodate the battery cells.

15. An electrical device, characterized in that: The battery according to claim 14 is used to provide electrical energy.

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