Battery monomer, battery and electric device

Abstract

The utility model provides a battery monomer, a battery and a power utilization device, an electrode assembly in the battery monomer is accommodated in a shell, a pole piece is wound along a winding direction, the end part of the pole piece in a first direction is provided with a plurality of tabs, an insulating part is provided with a plurality of channels penetrating along the first direction, and each tab penetrates through the channel to be electrically connected with an electrode leading-out part; in the winding direction, the tab penetrating through the first channel is closer to the inner end of the pole piece than the tab penetrating through the second channel; in the winding direction, the length of the first channel is T1, the length of the second channel is T2, and T2 is larger than T1. The tabs closer to the inner end of the pole piece are not easy to misplace in the winding process of the pole piece, so that the tabs closer to the inner end of the pole piece can well position the insulating part through the first channel with smaller length in the winding direction; and meanwhile, the tabs farther away from the inner ends of the pole pieces can smoothly penetrate through the second channels to be electrically connected with the electrode leading-out pieces even if dislocation occurs, so that the reliability of the single battery is improved.

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] Batteries have the advantages of high specific energy and high power density. They are widely used in electronic devices and transportation vehicles, such as mobile phones, laptops, electric vehicles, electric airplanes, electric ships, electric tools, etc.

[0003] As the application scope of batteries continues to expand, people's requirements for battery reliability are becoming higher and higher. How to improve the reliability of batteries has attracted more and more attention from technicians in this field. Utility Model Content

[0004] In view of the above problems, the present application provides a battery cell, a battery and an electrical device, wherein the battery cell helps to improve the reliability of the battery.

[0005] In a first aspect, some embodiments of the present application provide a battery cell, which includes a shell, an electrode assembly, an electrode lead-out member and an insulating member, wherein the electrode assembly is accommodated in the shell, the electrode assembly includes a pole piece, the pole piece is wound along a winding direction, and the end of the pole piece along a first direction has a plurality of pole ears, and the first direction is perpendicular to the winding direction; the electrode lead-out member is arranged on the shell; the insulating member is provided with a plurality of channels passing through along the first direction, and each pole ear is electrically connected to the electrode lead-out member through the channel; wherein the plurality of channels include a first channel and a second channel, and in the winding direction, the pole ear passing through the first channel is closer to the inner end of the pole piece than the pole ear passing through the second channel; along the winding direction, the length of the first channel is T1, and the length of the second channel is T2, and T2>T1.

[0006] In the above structure, since the length T1 of the first channel through which the pole ear closer to the inner end of the pole piece passes is smaller in the winding direction, and the pole ear closer to the inner end of the pole piece is not easy to be misplaced during the winding process of the pole piece, the pole ear closer to the inner end of the pole piece can be well positioned on the insulating part through the first channel with a smaller length in the winding direction; at the same time, since the length T2 of the second channel through which the pole ear farther from the inner end of the pole piece passes is larger in the winding direction, even if the pole ear farther from the inner end of the pole piece is misplaced, it can smoothly pass through the second channel to be electrically connected to the electrode lead-out member, which is beneficial to improving the reliability of the battery cell.

[0007] According to the battery cells provided in some embodiments of the present application, the insulating member is provided with a through hole extending along a first direction, the electrode assembly has a central hole, and the through hole and the central hole are arranged opposite to each other in the first direction so that the through hole and the central hole can be connected and can serve as a channel for injecting electrolyte.

[0008] According to the battery cell provided in some embodiments of the present application, the minimum distance between the first channel and the through hole along the radial direction of the electrode assembly is L1, and the radial dimension of the electrode assembly is L2. The position of the first channel is made closer to the inner end of the pole piece in the electrode assembly, and the pole ear passing through the first channel is made closer to the inner end of the pole piece, so that the position of the pole ear passing through the first channel is not easy to be misplaced, and the cooperation between the pole ear passing through the first channel and the first channel can better position the insulating part, which is beneficial to improving the positioning accuracy of the insulating part.

[0009] According to the battery cells provided in some embodiments of the present application, the first channel is configured as a rectangular channel. By setting the first channel as a rectangular channel, when the pole ear extending from the pole piece is extended into the first channel, the cooperation between the first channel and the pole ear can better limit the rotation of the insulating part, which helps to improve the positioning effect of the insulating part.

[0010] According to the battery cells provided in some embodiments of the present application, the second channel is configured as an arc-shaped channel, and the arc-shaped channel extends along the winding direction. By setting the second channel as an arc-shaped channel and extending along the winding direction, the electrode ear can pass through the second channel even if it is misaligned in the winding direction during the winding process of the electrode sheet, so as to be electrically connected to the electrode lead-out piece.

[0011] According to the battery cells provided in some embodiments of the present application, in the radial direction of the electrode assembly, the first channel and the second channel at least partially overlap, so that the second channel has a sufficient length in the winding direction, so that the electrode ear can smoothly pass through the second channel, and even if it is misaligned in the winding direction, it can still pass through the second channel to be connected to the electrode lead-out piece.

[0012] According to the battery cells provided in some embodiments of the present application, the pole piece is wound into multiple turns, and the multiple pole ears are respectively located in different turn layers, so that the multiple pole ears can be arranged at relatively uniform intervals along the winding direction of the pole piece, which is beneficial to enable the current on the pole piece to be drawn out more evenly.

[0013] According to the battery cells provided in some embodiments of the present application, in the radial direction of the electrode assembly, two adjacent second channels at least partially overlap, so that the second channel has a sufficient length in the winding direction, so that the electrode ear can smoothly pass through the second channel even if it is misaligned in the winding direction.

[0014] According to the battery cells provided in some embodiments of the present application, the second channel includes a first part and a second part connected along the winding direction; in the radial direction of the electrode assembly, the size of the second part is H2, and the size of the first part is H1, H1>H2, so that the second channel has a part with a larger size in the radial direction of the electrode assembly, so that even if the electrode ear is misaligned in the radial direction of the electrode assembly, it can pass through the second channel by passing through the first part, so that the electrode ear can pass through the second channel more easily and smoothly, and is convenient for connection with the current collecting member.

[0015] According to the battery cells provided in some embodiments of the present application, at least one channel is a groove recessed inward from the outer circumference of the insulating member, so that the pole ears on the pole pieces of the outermost circle can smoothly pass through the second channel connected to the outer circumference of the insulating member.

[0016] According to the battery cell provided in some embodiments of the present application, the battery cell also includes a current collecting component connected to the electrode lead-out piece, and the pole piece also includes a pole piece body connected to the pole ear. The current collecting component and the pole piece body are respectively located on both sides of the insulating member in a first direction, and each pole ear is connected to the current collecting component, so that the insulating member can both insulate and isolate the current collecting component and the pole piece body, and the pole ear can be conveniently connected to the current collecting component through the channel of the insulating member.

[0017] According to the battery cells provided in some embodiments of the present application, the current collecting component includes a current collecting structure and a transition structure connected to the current collecting structure, the current collecting structure and the electrode lead-out member are spaced apart along a first direction, a plurality of pole tabs are connected to the current collecting structure, and the transition structure is bent toward the electrode lead-out member and connected to the electrode lead-out member, so that the plurality of pole tabs are electrically connected to the electrode lead-out member smoothly.

[0018] According to the battery cells provided in some embodiments of the present application, a third channel and a fourth channel passing through along a first direction are provided on the current collecting structure, and along the winding direction, the length of the third channel is T3, and the length of the fourth channel is T4, T4>T3; in the first direction, the projection of the third channel at least partially overlaps with the projection of the first channel, and the projection of the fourth channel at least partially overlaps with the projection of the second channel, so that the pole ear can be connected to the side of the current collecting structure away from the pole piece body after passing through the first channel and the third channel, and can be connected to the side of the current collecting structure away from the pole piece body after passing through the second channel and the fourth channel.

[0019] According to the battery cells provided in some embodiments of the present application, the electrode assembly is configured as a cylindrical winding structure.

[0020] In a second aspect, some embodiments of the present application further provide a battery, comprising a battery cell as provided by any of the above technical solutions.

[0021] In a third aspect, some embodiments of the present application further provide an electrical device, which includes a battery provided by the above technical solution, and the battery is used to provide electrical energy.

[0022] The technical solution provided by the embodiments of the present disclosure brings at least the following beneficial effects:

[0023] Some embodiments of the present application provide a battery cell, which includes a shell, an electrode assembly, an electrode lead-out member and an insulating member, wherein the electrode assembly is accommodated in the shell, the electrode assembly includes a pole piece, the pole piece is wound along a winding direction, and the end of the pole piece along a first direction has a plurality of pole ears, and the first direction is perpendicular to the winding direction; the electrode lead-out member is arranged on the shell; the insulating member is provided with a plurality of channels passing through along the first direction, and each pole ear is electrically connected to the electrode lead-out member through the channel; wherein the plurality of channels include a first channel and a second channel, and in the winding direction, the pole ear passing through the first channel is closer to the inner end of the pole piece than the pole ear passing through the second channel; along the winding direction, the length of the first channel is T1, and the length of the second channel is T2, and T2>T1. In the above structure, since the length T1 of the first channel through which the pole ear closer to the inner end of the pole piece passes is smaller in the winding direction, and the pole ear closer to the inner end of the pole piece is not easy to be misplaced during the winding process of the pole piece, the pole ear closer to the inner end of the pole piece can be well positioned on the insulating part through the first channel with a smaller length in the winding direction; at the same time, since the length T2 of the second channel through which the pole ear farther from the inner end of the pole piece passes is larger in the winding direction, even if the pole ear farther from the inner end of the pole piece is misplaced, it can smoothly pass through the second channel to be electrically connected to the electrode lead-out member, which is beneficial to improving the reliability of the battery cell.

[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] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not considered to be limitations of the present application. In addition, the same reference symbols are used to represent the same components throughout the accompanying drawings.

[0026] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0027] Figure 2 An exploded view of a battery provided in some embodiments of the present application;

[0028] Figure 3An exploded view of a battery module provided in some embodiments of the present application;

[0029] Figure 4 A cross-sectional view of a battery cell provided in some embodiments of the present application;

[0030] Figure 5 A disassembled diagram of a battery cell provided in some embodiments of the present application;

[0031] Figure 6 A schematic diagram of the structure of an insulating member provided in some embodiments of the present application;

[0032] Figure 7 A schematic diagram of the structure of an insulating member provided in some other embodiments of the present application;

[0033] Figure 8 A schematic diagram of the structure of an insulating member provided in some further embodiments of the present application;

[0034] Fig. 9 A schematic diagram of the structure of an electrode assembly provided in some embodiments of the present application;

[0035] Fig.10 A schematic diagram of the structure of a current collecting component provided in some embodiments of the present application;

[0036] Fig.11 Schematic diagram of the structure of the current collecting component provided in other embodiments of the present application.

[0037] In the attached picture:

[0038] 1. Vehicle; 2. Battery; 3. Controller; 4. Motor; 5. Box; 5a. First box part; 5b. Second box part; 5c. Accommodation space; 6. Battery module; 7. Battery cell; 20. Shell; 201. Shell; 202. Cover; 30. Electrode assembly; 301. Pole piece; 3011. Pole piece body; 3012. Pole ear; 302. Center hole; 303. Isolator; 40. Electrode lead-out member; 50. Current collecting member; 501. Current collecting structure; 5011. Third channel; 5012. Fourth channel; 502. Transfer structure; 70. Insulator; 701. Channel; 7011. First channel; 7012. Second channel; 70121. First part; 70122. Second part; 702. Through hole; X. Winding direction; Y. First direction. DETAILED DESCRIPTION

[0039] 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.

[0040] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings 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" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof 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.

[0041] Reference to "embodiment" 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.

[0042] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" 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 it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0043] 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.

[0044] 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 various components 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.

[0045] In the embodiments of the present application, "parallel" includes not only the absolutely parallel situation, but also the roughly parallel situation conventionally recognized in engineering; at the same time, "perpendicular" also includes not only the absolutely perpendicular situation, but also the roughly perpendicular situation conventionally recognized in engineering. For example, if the angle between two directions is 85°-90°, the two directions can be considered perpendicular; if the angle between two directions is 0°-5°, the two directions can be considered parallel.

[0046] The term "plurality" used in the present application refers to two or more (including two).

[0047] At present, judging from the development of the market situation, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields.

[0048] 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.

[0049] The battery cell may be a secondary battery cell, which refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0050] The battery cells may be lithium-ion battery cells, sodium-ion battery cells, sodium-lithium-ion battery cells, lithium metal battery cells, sodium metal battery cells, lithium-sulfur battery cells, magnesium-ion battery cells, nickel-hydrogen battery cells, nickel-cadmium battery cells, lead-acid battery cells, etc.

[0051] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and removed between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0052] In some embodiments, the battery cell further includes an electrolyte, which acts as a conductor of ions between the positive electrode and the negative electrode. The present application has no specific restrictions on the type of electrolyte, which can be selected according to needs. The electrolyte can be liquid, gel or solid.

[0053] In some embodiments, the liquid electrolyte includes an electrolyte salt and a solvent.

[0054] In some embodiments, the electrolyte salt can be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium dioxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0055] In some embodiments, the solvent can be selected from at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent can also be selected from ether solvents. Ether solvents can include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether and crown ether.

[0056] The gel electrolyte includes a polymer-based electrolyte framework network combined with an ionic liquid-lithium salt.

[0057] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0058] As an example, the polymer solid electrolyte may be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, polyionic liquid-lithium salt, cellulose, and the like.

[0059] As an example, the inorganic solid electrolyte can be an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0060] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0061] In some embodiments, the electrode assembly is a wound structure. Optionally, the electrode assembly is a cylindrical wound structure.

[0062] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film.

[0063] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery.

[0064] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0065] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are accommodated in the case.

[0066] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0067] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0068] The cylindrical battery cells of the related art are usually provided with current collecting components, and an insulating component is required between the current collecting components and the pole piece body for insulation. The multiple pole tabs in the pole piece are usually firmly connected to the current collecting components by passing through the insulating component and then welding to the current collecting component. Since the pole pieces in the cylindrical battery cells are usually wound, the pole tabs on the pole pieces may be misaligned (miss the preset position) during the winding process, and the pole tabs on the pole pieces closer to the outer ring are more likely to be misaligned, making it difficult for the insulating component to align with the pole tabs, making it difficult for the pole tabs to pass through the insulating component smoothly, causing abnormal connection of the pole tabs and reducing the reliability of the battery cells.

[0069] In order to enable the pole ear to smoothly pass through the insulating member and connect with the current collecting member, reduce connection abnormalities, and improve the reliability of the battery cell, some embodiments of the present application provide a battery cell, which includes a shell, an electrode assembly, an electrode lead-out member and an insulating member, the electrode assembly is accommodated in the shell, the electrode assembly includes a pole piece, the pole piece is wound along a winding direction, and the end of the pole piece along a first direction has a plurality of pole ears, and the first direction is perpendicular to the winding direction; the electrode lead-out member is arranged on the shell; the insulating member is provided with a plurality of channels passing through the first direction, and each pole ear is electrically connected to the electrode lead-out member through the channel; wherein the plurality of channels include a first channel and a second channel, and in the winding direction, the pole ear passing through the first channel is closer to the inner end of the pole piece than the pole ear passing through the second channel; along the winding direction, the length of the first channel is T1, the length of the second channel is T2, and T2>T1. In the above structure, since the length T1 of the first channel through which the pole ear closer to the inner end of the pole piece passes is smaller in the winding direction, and the pole ear closer to the inner end of the pole piece is not easy to be misplaced during the winding process of the pole piece, the pole ear closer to the inner end of the pole piece can be well positioned on the insulating part through the first channel with a smaller length in the winding direction; at the same time, since the length T2 of the second channel through which the pole ear farther from the inner end of the pole piece passes is larger in the winding direction, even if the pole ear farther from the inner end of the pole piece is misplaced, it can smoothly pass through the second channel to be electrically connected to the electrode lead-out member, which is beneficial to improving the reliability of the battery cell.

[0070] The battery cells described in the embodiments of the present application are suitable for use in batteries and electrical devices using the batteries.

[0071] Electrical devices may be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, electric tools, etc. Vehicles may be fuel vehicles, gas vehicles or new energy vehicles, and new energy vehicles may be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc. Spacecraft include aircraft, rockets, space shuttles and spacecrafts, 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.

[0072] 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.

[0073] Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application.

[0074] like Figure 1As shown, a battery 2 is disposed inside the vehicle 1, and the battery 2 may be disposed at the bottom, head, or tail of the vehicle 1. The battery 2 may be used to power the vehicle 1, for example, the battery 2 may be used as an operating power source for the vehicle 1.

[0075] The vehicle 1 may further include a controller 3 and a motor 4 , wherein the controller 3 is used to control the battery 2 to supply power to the motor 4 , for example, to meet the power requirements of starting, navigating, and driving the vehicle 1 .

[0076] In some embodiments of the present application, the battery 2 can not only serve as an operating power source for the vehicle 1, but also serve 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.

[0077] Figure 2 Schematic diagram of an explosion of a battery provided in some embodiments of the present application. Figure 2 As shown, the battery 2 includes a housing 5 and a battery cell (not shown), and the battery cell is accommodated in the housing 5. The battery cell can be the smallest unit constituting the battery. A plurality of battery cells constitute a battery module 6, and the battery module 6 is arranged in the housing 5 as an integral structure.

[0078] The box 5 is used to accommodate the battery cells, and the box 5 can be of various structures. In some embodiments, the box 5 can include a first box portion 5a and a second box portion 5b, the first box portion 5a and the second box portion 5b cover each other, and the first box portion 5a and the second box portion 5b jointly define a storage space 5c for accommodating the battery cells. The second box portion 5b can be a hollow structure with one end open, the first box portion 5a is a plate-like structure, and the first box portion 5a covers the open side of the second box portion 5b to form a box 5 with a storage space 5c; the first box portion 5a and the second box portion 5b can also be hollow structures with one side open, and the open side of the first box portion 5a covers the open side of the second box portion 5b to form a box 5 with a storage space 5c. Of course, the first box portion 5a and the second box portion 5b can be of various shapes, such as a cylinder, a cuboid, etc.

[0079] In order to improve the sealing performance after the first box body part 5a and the second box body part 5b are connected, a sealing member, such as a sealant, a sealing ring, etc., may also be provided between the first box body part 5a and the second box body part 5b.

[0080] Assuming that the first box body portion 5a covers the top of the second box body portion 5b, the first box body portion 5a can also be called an upper box cover, and the second box body portion 5b can also be called a lower box.

[0081] In the battery 2, there can be one or more battery cells. If there are multiple battery cells, the multiple battery cells can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells are both connected in series and in parallel. The multiple battery cells can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells is accommodated in the box 5; of course, multiple battery cells can also be connected in series, in parallel, or in mixed connection to form a battery module 6, and the multiple battery modules 6 are then connected in series, in parallel, or in mixed connection to form a whole, and accommodated in the box 5.

[0082] Figure 3 for Figure 2 An exploded schematic diagram of a battery module 6 is shown.

[0083] like Figure 3 As shown, in some embodiments, there are multiple battery cells 7, and the multiple battery cells 7 are first connected in series, in parallel, or in mixed connection to form a battery module 6. The multiple battery modules 6 are then connected in series, in parallel, or in mixed connection to form a whole, and are accommodated in a box.

[0084] The multiple battery cells 7 in the battery module 6 can be electrically connected through a busbar to achieve parallel connection, series connection or mixed connection of the multiple battery cells 7 in the battery module 6 .

[0085] The battery cell 7 may be a cylindrical battery cell, a square battery cell, or a battery cell of other shapes.

[0086] like Figure 4 As shown, in some embodiments, the battery cell 7 includes a housing 20 and an electrode assembly 30. The electrode assembly 30 is accommodated in the housing 20. The electrode assembly 30 is a cylindrical winding structure.

[0087] The housing 20 may be in various shapes and sizes, such as a rectangular parallelepiped, a hexagonal prism, etc. Specifically, the shape of the housing 20 may be determined according to the specific shape and size of the electrode assembly 30. The housing 20 may be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc., and the present embodiment of the application does not impose any special restrictions on this.

[0088] The electrode assembly 30 is a component where electrochemical reactions occur in the battery cell 7. One or more electrode assemblies 30 may be contained in the housing 20.

[0089] Some embodiments of the present application provide a battery cell 7, such as Figure 5As shown, the battery cell 7 includes a housing 20, an electrode assembly 30, an electrode lead-out member 40 and an insulating member 70. The electrode assembly 30 is accommodated in the housing 20. The electrode assembly 30 includes a pole piece 301, which is wound along a winding direction X. The pole piece 301 has a plurality of pole ears 3012 at the end along a first direction Y, and the first direction Y is perpendicular to the winding direction X. The electrode lead-out member 40 is arranged on the housing 20. The insulating member 70 is provided with a plurality of channels 701 passing through the first direction Y, and each pole ear 3012 is electrically connected to the electrode lead-out member 40 through the channel 701. Figure 6 As shown, the multiple channels 701 include a first channel 7011 and a second channel 7012. In the winding direction X, the pole ear 3012 passing through the first channel 7011 is closer to the inner end of the pole piece 301 than the pole ear 3012 passing through the second channel 7012; along the winding direction X, the length of the first channel 7011 is T1, the length of the second channel 7012 is T2, and T2>T1.

[0090] The outer shell 20 is a component used to enclose a sealed space in the battery cell 7, which may include a shell 201 and two covers 202. The shell 201 is a hollow structure with openings on two opposite sides. One cover 202 corresponds to an opening of the shell 201 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 30 and the electrolyte.

[0091] The electrode sheet 301 included in the electrode assembly 30 can be a positive electrode sheet or a negative electrode sheet with opposite polarities, and the positive electrode sheet and the negative electrode sheet can be used as the positive electrode and the negative electrode, respectively. Exemplarily, the electrode assembly 30 can also include a separator 303, which is stacked between the positive electrode sheet and the negative electrode sheet to isolate the positive electrode sheet from the negative electrode sheet.

[0092] The electrode sheet 301 may be wound along the winding direction X. The stacked positive electrode sheet, negative electrode sheet and separator 303 in the electrode assembly 30 may be wound along the winding direction X. The electrode sheet 301 is wound along the winding direction X, so that the electrode assembly 30 has a wound structure.

[0093] The pole tab 3012 may be a portion provided on the pole piece 301 for electrically connecting to the electrode lead-out member 40 of the battery cell 7. By providing the pole tab 3012 at the end of the pole piece 301 along the first direction Y, the end of the pole piece 301 in the first direction Y can be connected to other components through the pole tab 3012, so that the pole piece 301 is electrically connected to the electrode lead-out member 40. By providing a plurality of pole tabs 3012 at intervals at the end of the pole piece 301 in the first direction Y, the pole piece 301 can transfer electric energy uniformly and stably with other components through the plurality of pole tabs 3012.

[0094] Since the first direction Y is perpendicular to the winding direction X, the pole ears 3012 can be arranged at both ends of the pole piece 301 perpendicular to the winding direction X, so that other components in the battery cell 7 can be arranged at both ends of the electrode assembly 30 .

[0095] The pole tab 3012 can be formed by cutting the pole piece 301, so that the pole tab 3012 on the pole piece 301 can be easily processed and formed. Exemplarily, the pole tab 3012 can be formed by cutting the pole piece 301 through a die-cutting process, so that the processing of the pole tab 3012 has high efficiency.

[0096] The electrode lead-out member 40 may be a component in the battery cell 7 for electrically connecting to an external device, and is used to output the electric energy in the battery cell 7 to the outside or charge the battery cell 7. The electrode lead-out member 40 is disposed on the housing 20, and at least a portion thereof extends into the housing 20 for electrically connecting to the tab 3012, and another portion thereof extends from the housing 20 for connecting to an external device.

[0097] Exemplarily, the electrode lead-out member 40 may be a columnar structure or a sheet structure, and those skilled in the art may set the shape of the electrode lead-out member 40 according to actual conditions so that the electrode lead-out member 40 can be easily connected to an external device.

[0098] The insulating member 70 may be a component with insulating properties, which is disposed on one side of the electrode lead-out member 40 close to the electrode assembly 30 in the first direction Y, and is used to reduce the possibility of short circuit caused by connection between the electrode piece 301 and other components in the battery cell 7 .

[0099] The channel 701 may be a structure opened on the insulating member 70 , which penetrates the insulating member 70 along the first direction Y, so that the tab 3012 can pass through the insulating member 70 via the channel 701 .

[0100] Each pole lug 3012 passes through the channel 701 and extends outwardly along the first direction Y. For example, each pole lug 3012 may pass through the channel 701 one by one, so that one pole lug 3012 passes through one channel 701; or multiple pole lugs 3012 may pass through at least one channel 701, which is beneficial to reduce the number of channels 701 and simplify the processing of the insulating member 70.

[0101] The first channel 7011 and the second channel 7012 may be two different channels 701 among the multiple channels 701. The pole ear 3012 passing through the first channel 7011 is closer to the inner end of the pole piece 301 than the pole ear 3012 passing through the second channel 7012. The first channel 7011 may be closer to the inner end of the pole piece 301 than the second channel 7012, so that the pole ear 3012 passing through the first channel 7011 is closer to the inner end of the pole piece 301 than the pole ear 3012 passing through the second channel 7012. The length T1 of the first channel 7011 in the winding direction X is the length of the inner side of the two opposite ends of the first channel 7011 in the winding direction X, and the length T2 of the second channel 7012 in the winding direction X is the length of the inner side of the two opposite ends of the second channel 7012 in the winding direction X. The length of the second channel 7012 in the winding direction X is set to T2. By setting T2>T1, the active space of the pole lug 3012 passing through the first channel 7011 in the winding direction X is smaller, so that the first channel 7011 can define the position of the pole lug 3012 more accurately, so that the first channel 7011 with a smaller length in the winding direction X can position the insulating member 70 more accurately; at the same time, the active space of the pole lug 3012 passing through the second channel 7012 in the winding direction X is larger, so that the second channel 7012 can better accommodate the pole lug 3012 that is misplaced in the winding direction X, so that the pole lug 3012 can smoothly pass through the second channel 7012 even if it is misplaced.

[0102] In the above structure, since the length T1 of the first channel 7011 through which the pole ear 3012 closer to the inner end of the pole piece 301 passes is smaller in the winding direction X, and the pole ear 3012 closer to the inner end of the pole piece 301 is not easy to be misplaced during the winding process of the pole piece 301, the pole ear 3012 closer to the inner end of the pole piece 301 can be well positioned on the insulating member 70 through the first channel 7011 with a smaller length in the winding direction X; at the same time, since the length T2 of the second channel 7012 through which the pole ear 3012 farther from the inner end of the pole piece 301 passes is larger in the winding direction X, even if the pole ear 3012 farther from the inner end of the pole piece 301 is misplaced, it can smoothly pass through the second channel 7012 to be electrically connected to the electrode lead-out member 40, which is beneficial to improving the reliability of the battery cell 7.

[0103] In some embodiments, the insulating member 70 is provided with a through hole 702 penetrating along the first direction Y, the electrode assembly 30 has a central hole 302 , and the through hole 702 and the central hole 302 are arranged opposite to each other in the first direction Y.

[0104] The center hole 302 in the electrode assembly 30 may be a space located in the middle of the electrode assembly 30 formed after the pole piece 301 in the electrode assembly 30 is wound. The through hole 702 may be a hole-like structure formed by removing material on the insulating member 70, which penetrates the insulating member 70 along the first direction Y. The through hole 702 and the center hole 302 are arranged relative to each other in the first direction Y, and may be that along the first direction Y, the through hole 702 and the center hole 302 at least partially overlap, so that the through hole 702 and the center hole 302 can be connected, and can serve as a channel 701 for injecting electrolyte. Exemplarily, the through hole 702 and the center hole 302 can be coaxially arranged so that the through hole 702 and the center hole 302 are directly opposite to each other, which is convenient for arranging the relative positions of the electrode assembly 30 and the insulating member 70.

[0105] Exemplarily, the through hole 702 can be simultaneously manufactured along with the insulating member 70 by a stamping process, which is beneficial to improving the processing efficiency of the insulating member 70 .

[0106] In some embodiments, the minimum distance between the first channel 7011 and the through hole 702 along the radial direction of the electrode assembly 30 is L1, and the radial dimension of the electrode assembly 30 is L2.

[0107] The radial dimension L2 of the electrode assembly 30 may refer to the thickness of the electrode assembly 30 in the radial direction, and the minimum distance L1 between the first channel 7011 and the through hole 702 in the radial direction of the electrode assembly 30 may refer to the shortest distance between the edge of the first channel 7011 and the edge of the through hole 702. The position of the first channel 7011 is made closer to the inner end of the pole piece 301 in the electrode assembly 30, and the pole ear 3012 passing through the first channel 7011 is made closer to the inner end of the pole piece 301, so that the position of the pole ear 3012 passing through the first channel 7011 is not easy to be misplaced, and the cooperation between the pole ear 3012 passing through the first channel 7011 and the first channel 7011 can better position the insulating component 70, which is beneficial to improving the positioning accuracy of the insulating component 70.

[0108] In some embodiments, the first channel 7011 is a rectangular channel 701 .

[0109] The rectangular channel 701 may refer to a channel 701 having a rectangular cross-sectional shape perpendicular to the first direction Y. Since the pole piece 301 in the electrode assembly 30 is wound, by setting the first channel 7011 as a rectangular channel 701, when the pole lug 3012 extending from the pole piece 301 is inserted into the first channel 7011, the cooperation between the first channel 7011 and the pole lug 3012 can better limit the rotation of the insulating member 70, which helps to improve the positioning effect of the insulating member 70.

[0110] Exemplarily, the first channel 7011 may also be configured as a channel 701 of other shapes other than the arc-shaped channel 701 , such as a triangular channel 701 , so that the first channel 7011 can better limit the movement of the pole ear 3012 passing through the first channel 7011 .

[0111] In some embodiments, the second channel 7012 is an arc-shaped channel 701 , and the arc-shaped channel 701 extends along the winding direction X.

[0112] The arc-shaped channel 701 may refer to a channel 701 having an arc-shaped cross-section perpendicular to the first direction Y. Since the pole piece 301 in the electrode assembly 30 is wound, by setting the second channel 7012 as the arc-shaped channel 701 and extending along the winding direction X, the pole ear 3012 can pass through the second channel 7012 even if it is misaligned in the winding direction X during the winding process of the pole piece 301, so as to be electrically connected to the electrode lead-out member 40.

[0113] In some embodiments, in the radial direction of the electrode assembly 30 , the first channel 7011 and the second channel 7012 at least partially overlap.

[0114] By making the first channel 7011 and the second channel 7012 at least partially overlap in the radial direction of the electrode assembly 30, the second channel 7012 has a sufficient length in the winding direction X, so that the electrode tab 3012 can smoothly pass through the second channel 7012, and can pass through the second channel 7012 to be connected to the electrode lead-out member 40 even if it is misaligned in the winding direction X.

[0115] In some embodiments, the pole piece 301 is wound into multiple turns, and the multiple pole ears 3012 are respectively located in different turn layers.

[0116] By winding the pole piece 301 into multiple turns and arranging the multiple pole ears 3012 to extend from different turns of the pole piece 301, the multiple pole ears 3012 can be arranged at relatively uniform intervals along the winding direction X of the pole piece 301, which is conducive to more uniform extraction of the current on the pole piece 301.

[0117] In some embodiments, in the radial direction of the electrode assembly 30 , two adjacent second channels 7012 at least partially overlap.

[0118] By making two adjacent second channels 7012 at least partially overlap in the radial direction of the electrode assembly 30, the second channel 7012 has a sufficient length in the winding direction X, so that the electrode tab 3012 can smoothly pass through the second channel 7012 even if it is misaligned in the winding direction X.

[0119] In some embodiments, the second channel 7012 includes a first portion 70121 and a second portion 70122 that are connected along the winding direction X; Figure 7 As shown, in the radial direction of the electrode assembly 30, the size of the second portion 70122 is H2, the size of the first portion 70121 is H1, and H1>H2.

[0120] The first part 70121 and the second part 70122 are different parts of the second channel 7012 that are connected to each other, and the two parts are connected along the winding direction X. Exemplarily, two second parts 70122 are provided, and the two second parts 70122 are connected to both ends of the first part 70121 in the winding direction X respectively.

[0121] The size of the second portion 70122 in the radial direction of the electrode assembly 30 is set to H2, and the size of the first portion 70121 in the radial direction of the electrode assembly 30 is set to H1. By making H1>H2, the second channel 7012 has a larger portion in the radial direction of the electrode assembly 30, so that even if the electrode tab 3012 is misaligned in the radial direction of the electrode assembly 30, it can pass through the second channel 7012 by passing through the first portion 70121, so that the electrode tab 3012 can pass through the second channel 7012 more easily and smoothly.

[0122] In some embodiments, Figure 8 As shown, at least one channel 701 is a groove recessed inward from the outer circumference of the insulating member 70 .

[0123] At least one channel 701 is a groove recessed inward from the outer circumferential surface of the insulating member 70, which may mean that the second channel 7012 located at the outermost side in the radial direction of the insulating member 70 is formed by a groove recessed inward from the outer circumferential surface of the insulating member 70, and the second channel 7012 can be connected to the outer circumferential surface of the insulating member 70, so that the pole ear 3012 on the pole piece 301 of the outermost circle can smoothly pass through the second channel 7012 connected to the outer circumferential surface of the insulating member 70.

[0124] In some embodiments, the battery cell 7 further includes a current collecting member 50 connected to the electrode lead-out member 40, such as Fig. 9 As shown, the pole piece 301 further includes a pole piece body 3011 connected to the pole lug 3012 , the current collecting component 50 and the pole piece body 3011 are respectively located on both sides of the insulating member 70 in the first direction Y, and each pole lug 3012 is connected to the current collecting component 50 .

[0125] The current collecting member 50 may be a component for connecting the plurality of tabs 3012. The current collecting member 50 is electrically connected to the electrode lead-out member 40, so that the electric energy output by the plurality of tabs 3012 can be collected on the current collecting member 50 and then transmitted to the electrode lead-out member 40.

[0126] The pole piece body 3011 may be the main part of the pole piece 301 , and the pole ear 3012 is connected to the end of the pole piece body 3011 in the first direction Y and extends outward.

[0127] By locating the current collecting component 50 and the pole piece body 3011 on both sides of the insulating component 70 in the first direction Y, respectively, the pole ear 3012 is connected to the current collecting component 50 after passing through the through hole 702 along the first direction Y, so that the insulating component 70 can both insulate and isolate the current collecting component 50 and the pole piece body 3011, and the pole ear 3012 can be conveniently connected to the current collecting component 50 through the channel 701 of the insulating component 70.

[0128] In some embodiments, Fig.10 As shown, the current collecting component 50 includes a current collecting structure 501 and a transition structure 502 connected to the current collecting structure 501, the current collecting structure 501 and the electrode lead-out member 40 are spaced apart along the first direction Y, a plurality of pole ears 3012 are connected to the current collecting structure 501, and the transition structure 502 is bent toward the electrode lead-out member 40 and connected to the electrode lead-out member 40.

[0129] The current collecting structure 501 and the transfer structure 502 are two parts of the current collecting structure 501, and the two are connected to each other. The current collecting structure 501 and the electrode lead-out member 40 are arranged at intervals along the first direction Y, and the multiple pole tabs 3012 are connected to the current collecting structure 501, so that the electric energy on the pole piece 301 can be collected in the current collecting structure 501 through the multiple pole tabs 3012, which is convenient for electrical connection with the electrode lead-out member 40. The transfer structure 502 can be a structure in the current collecting structure 501 that is connected to the electrode lead-out member 40. The transfer structure 502 is connected to the electrode lead-out member 40 after being bent toward the electrode lead-out member 40, so that the multiple pole tabs 3012 are smoothly electrically connected to the electrode lead-out member 40.

[0130] Exemplarily, the end of the transition structure 502 away from the current collecting structure 501 is welded to the electrode lead-out member 40 .

[0131] Since welding can melt the materials of the adapter structure 502 and the electrode lead-out member 40 together, it is not only beneficial to improve the connection strength between the adapter structure 502 and the electrode lead-out member 40, but also beneficial to reduce the resistance at the connection between the two, which helps to improve the power performance of the battery cell 7. In some embodiments, the adapter structure 502 can be connected to the electrode lead-out member 40 by laser welding. Since laser welding has the characteristics of a small heat-affected zone and easy automatic control, the connection of the adapter structure 502 to the electrode lead-out member 40 by laser welding is not only beneficial to improving welding quality, but also beneficial to improving production efficiency.

[0132] In some embodiments, the adapter structure 502 and the current collecting structure 501 can be connected by welding. Welding can melt the materials of the adapter structure 502 and the current collecting structure 501 together, which is not only beneficial to improve the connection strength between the adapter structure 502 and the current collecting structure 501, but also beneficial to reduce the resistance at the connection between the two, which helps to improve the power performance of the battery cell 7.

[0133] In some embodiments, the transfer structure 502 can be connected to the current collecting structure 501 by laser welding. Since laser welding has the characteristics of small heat affected zone and easy automation control, the transfer structure 502 connected to the current collecting structure 501 by laser welding is not only conducive to improving welding quality, but also conducive to improving production efficiency.

[0134] In some embodiments, Fig.11 As shown, the transfer structure 502 and the current collecting structure 501 are integrally formed structures. The transfer structure 502 and the current collecting structure 501 can be made by an integral forming processing method such as a stamping process, so that the transfer structure 502 and the current collecting structure 501 can be synchronously manufactured as a whole, which not only makes the processing and manufacturing of the transfer structure 502 and the current collecting structure 501 convenient, but also makes the current collecting component 50 as a whole structure have good strength; the transfer structure 502 and the current collecting structure 501 in the current collecting component 50 can also be made by a mechanical processing method such as a die cutting process by processing the whole piece of blank, so that the current collecting component 50 as a whole structure has a lower processing difficulty and processing cost.

[0135] In some embodiments, the current collecting structure 501 is provided with a third channel 5011 and a fourth channel 5012 penetrating along the first direction Y, and along the winding direction X, the length of the third channel 5011 is T3, and the length of the fourth channel 5012 is T4, T4>T3; in the first direction Y, the projection of the third channel 5011 at least partially overlaps with the projection of the first channel 7011, and the projection of the fourth channel 5012 at least partially overlaps with the projection of the second channel 7012.

[0136] The third channel 5011 and the fourth channel 5012 may be hole-shaped structures opened on the current collecting structure 501 and passing through in the first direction Y. In particular, along the winding direction X, the length of the third channel 5011 is T3, and the length of the fourth channel 5012 is T4, T4>T3, so that the fourth channel 5012 can correspond to the second channel 7012, and the third channel 5011 can correspond to the first channel 7011. By making the projection of the third channel 5011 in the first direction at least partially overlap with the projection of the first channel 7011 in the first direction Y, and making the projection of the fourth channel 5012 in the first direction Y at least partially overlap with the projection of the second channel 7012 in the first direction Y, the third channel 5011 and the first channel 7011, the fourth channel 5012 and the second channel 7012 are arranged in a one-to-one correspondence, the pole ear 3012 can pass through the first channel 7011 and the third channel 5011 and then be connected to the side of the current collecting structure 501 away from the pole piece body 3011, and the pole ear 3012 can pass through the second channel 7012 and the fourth channel 5012 and then be connected to the side of the current collecting structure 501 away from the pole piece body 3011.

[0137] In some embodiments, the electrode assembly 30 is configured as a cylindrical wound structure.

[0138] The electrode sheet 301 and the separator 303 in the electrode assembly 30 are wound to form a cylindrical winding structure.

[0139] Some embodiments of the present application further provide a battery 2, which includes a battery cell 7 provided by the above technical solution.

[0140] Some embodiments of the present application further provide an electrical device, which includes the battery 2 provided by the above technical solution, and the battery 2 is used to provide electrical energy.

[0141] Some embodiments of the present application provide a battery cell 7, which includes a housing 20, an electrode assembly 30, an electrode lead-out member 40, an insulating member 70, and a current collecting member 50. The electrode assembly 30, the current collecting member 50, and the insulating member 70 are accommodated in the housing 20. The pole piece 301 in the electrode assembly 30 is wound along a winding direction X, and a plurality of pole ears 3012 at the end of the pole piece body 3011 in the first direction Y pass through the channel 701 of the insulating member 70 and are connected to the current collecting member 50, and the current collecting member 50 is connected to the electrode lead-out member 40. The plurality of channels 701 are divided into a first channel 7011 and a second channel 7012. In the winding direction X, the pole ear 3012 passing through the first channel 7011 is closer to the inner end of the pole piece 301 than the pole ear 3012 passing through the second channel 7012. The length of the first channel 7011 along the winding direction X is T1, and the length of the second channel 7012 along the winding direction X is T2, and T2>T1. The first channel 7011 is configured as a rectangular channel 701, and the second channel 7012 is configured as an arcuate channel 701 extending along the winding direction X. The first channel 7011 and the second channel 7012 at least partially overlap in the radial direction of the electrode assembly 30, and two adjacent second channels 7012 at least partially overlap in the radial direction of the electrode assembly 30. The second channel 7012 includes a first portion 70121 and a second portion 70122, and the first portion 70121 is larger in size than the second portion 70122 in the radial direction of the electrode assembly 30. Since the length T1 of the first channel 7011 through which the pole ear 3012 closer to the inner end of the pole piece 301 passes is smaller in the winding direction X, and the pole ear 3012 closer to the inner end of the pole piece 301 is not easy to be misplaced during the winding process of the pole piece 301, the pole ear 3012 closer to the inner end of the pole piece 301 can be well positioned on the insulating member 70 through the first channel 7011 with a smaller length in the winding direction X; at the same time, since the length T2 of the second channel 7012 through which the pole ear 3012 farther from the inner end of the pole piece 301 passes is larger in the winding direction X, even if the pole ear 3012 farther from the inner end of the pole piece 301 is misplaced, it can smoothly pass through the second channel 7012 to be electrically connected to the electrode lead-out member 40, which is beneficial to improving the reliability of the battery cell 7.

[0142] 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 replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate 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, characterized in that: include: shell; An electrode assembly, contained in the housing, comprising a pole piece, the pole piece being wound along a winding direction, the pole piece having a plurality of pole ears at an end along a first direction, the first direction being perpendicular to the winding direction; An electrode lead-out member, disposed on the housing; an insulating member, provided with a plurality of channels penetrating along the first direction, each of the electrode tabs passing through the channels is electrically connected to the electrode lead-out member; wherein the plurality of channels include a first channel and a second channel, and in the winding direction, the electrode tab passing through the first channel is closer to the inner end of the electrode piece than the electrode tab passing through the second channel; Along the winding direction, the length of the first channel is T1, the length of the second channel is T2, and T2>T1.

2. The battery cell according to claim 1, characterized in that: The insulating member is provided with a through hole penetrating along the first direction, the electrode assembly has a central hole, and the through hole and the central hole are arranged opposite to each other in the first direction.

3. The battery cell according to claim 2, characterized in that: The minimum distance between the first channel and the through hole along the radial direction of the electrode assembly is L1, and the radial dimension of the electrode assembly is L2.

4. The battery cell according to claim 1, characterized in that: The first channel is configured as a rectangular channel.

5. The battery cell according to claim 1, characterized in that: The second channel is configured as an arc-shaped channel, and the arc-shaped channel extends along the winding direction.

6. The battery cell according to claim 1, characterized in that: In a radial direction of the electrode assembly, the first channel and the second channel at least partially overlap.

7. The battery cell according to claim 1, characterized in that: The pole piece is wound into multiple turns, and the multiple pole ears are respectively located in different turn layers.

8. The battery cell according to claim 1, characterized in that: In the radial direction of the electrode assembly, two adjacent second channels at least partially overlap.

9. The battery cell according to claim 1, characterized in that: The second channel includes a first portion and a second portion that are connected along the winding direction; in the radial direction of the electrode assembly, a size of the second portion is H2, a size of the first portion is H1, and H1>H2.

10. The battery cell according to claim 1, characterized in that: At least one of the channels is a groove recessed inwardly from the outer circumferential surface of the insulating member.

11. The battery cell according to claim 1, characterized in that: The battery cell further comprises a current collecting member connected to the electrode lead-out member, and the pole piece further comprises a pole piece body connected to the pole lug. The current collecting member and the pole piece body are respectively located on both sides of the insulating member in the first direction, and each pole lug is connected to the current collecting member.

12. The battery cell according to claim 11, characterized in that: The current collecting component includes a current collecting structure and a transition structure connected to the current collecting structure, the current collecting structure and the electrode lead-out member are spaced apart along the first direction, a plurality of the tabs are connected to the current collecting structure, and the transition structure is bent toward the electrode lead-out member and connected to the electrode lead-out member.

13. The battery cell according to claim 12, characterized in that: The current collecting structure is provided with a third channel and a fourth channel which penetrate along the first direction; along the winding direction, the length of the third channel is T3, the length of the fourth channel is T4, and T4>T3; in the first direction, the projection of the third channel at least partially overlaps with the projection of the first channel, and the projection of the fourth channel at least partially overlaps with the projection of the second channel.

14. The battery cell according to claim 1, characterized in that: The electrode assembly is configured as a cylindrical wound structure.

15. A battery, characterized in that: Comprising the battery cell according to any one of claims 1 to 14.

16. An electrical device, characterized in that: Comprising the battery of claim 15, the battery being used to provide electrical energy.

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