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 pole lugs, and a current collecting component is electrically connected to an electrode lead-out piece arranged on the shell. The tabs penetrate through the channels in the current collecting component and are connected to the current collecting component, 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, 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 ends of the pole pieces are not easy to misplace in the winding process of the pole pieces, so that the tabs closer to the inner ends of the pole pieces can well position the current collecting component through the first channels with smaller lengths 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 connected with the current collecting components even if the tabs are staggered, 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 piece and a current collecting 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 piece is arranged on the shell; the current collecting member is electrically connected to the electrode lead-out piece, and the current collecting member is provided with a plurality of channels, each channel penetrates the current collecting member along the first direction, and each pole ear passes through the channel and is connected to the current collecting member; 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 current collecting component 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 away from the inner end of the pole piece passes is larger in the winding direction, even if the pole ear farther away from the inner end of the pole piece is misplaced, it can smoothly pass through the second channel to connect with the current collecting component, which is beneficial to improving the reliability of the battery cell.

[0007] According to the battery cell provided in some embodiments of the present application, the battery cell also includes a converter, the current collecting component and the electrode lead-out component are arranged at intervals along a first direction, the converter connects the electrode lead-out component and the current collecting component, and the converter can facilitate electrical connection between the current collecting component and the electrode lead-out component.

[0008] According to the battery cell provided in some embodiments of the present application, the end of the adapter away from the current collecting member is welded to the electrode lead-out member, which is not only beneficial to improve the connection strength between the adapter and the electrode lead-out member, but also beneficial to reduce the resistance at the connection between the two, which helps to improve the power performance of the battery cell.

[0009] According to the battery cells provided in some embodiments of the present application, the current collecting component is provided with a through hole penetrating 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.

[0010] 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 current collecting component, which is beneficial to improving the positioning accuracy of the current collecting component.

[0011] According to the battery cell provided in some embodiments of the present application, the first channel is 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 first channel can cooperate with the pole ear to better limit the rotation of the current collecting component, which helps to improve the positioning effect of the current collecting component.

[0012] According to the battery cell provided in some embodiments of the present application, the second channel is 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 pole ear can pass through the second channel even if it is misaligned in the winding direction during the winding process of the pole sheet, so as to be connected with the current collecting member.

[0013] 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 current collecting member.

[0014] 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.

[0015] 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, and even if it is misaligned in the winding direction, it can still pass through the second channel to be connected to the current collecting member.

[0016] 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.

[0017] 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 circumferential surface of the current collecting component, and the second channel can be connected to the outer circumferential surface of the current collecting component, so that the pole ears on the pole pieces of the outermost circle can be smoothly passed through the second channel connected to the outer circumferential surface of the current collecting component to be firmly connected to the current collecting component.

[0018] According to the battery cells provided in some embodiments of the present application, the tabs are welded to the current collecting components, which is not only beneficial to improving the connection strength between the tabs and the current collecting components, but also beneficial to reducing the resistance at the connection between the two, which helps to improve the power performance of the battery cells.

[0019] According to the battery cell provided in some embodiments of the present application, the battery cell further includes an insulating member, the pole piece further includes a pole piece body connected to the pole lug, the insulating member is disposed between the pole piece body and the current collecting member, the insulating member is provided with a third channel penetrating along a first direction, and the pole lug is connected to the current collecting member through the third channel. The insulating member can achieve insulation isolation between the pole piece body and the current collecting member while also connecting the pole lug to the current collecting member.

[0020] According to the battery cells provided in some embodiments of the present application, the electrode assembly is configured as a cylindrical winding structure.

[0021] 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.

[0022] 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.

[0023] The technical solution provided by the embodiments of the present disclosure brings at least the following beneficial effects:

[0024] Some embodiments of the present application provide a battery cell, which includes a shell, an electrode assembly, an electrode lead-out piece and a current collecting member, the electrode assembly being accommodated in the shell, the electrode sheet in the electrode assembly being wound along a winding direction and having a plurality of pole ears at its end in a first direction, the first direction being perpendicular to the winding direction, the current collecting member being electrically connected to the electrode lead-out piece arranged on the shell, the current collecting member being provided with a plurality of channels penetrating the current collecting member along the first direction, each pole ear passing through the channel and being connected to the current collecting member, the plurality of channels including a first channel and a second channel, in the winding direction, the pole ear passing through the first channel is closer to the inner end of the pole sheet than the pole ear passing through the second channel, and 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 current collecting component 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 away from the inner end of the pole piece passes is larger in the winding direction, even if the pole ear farther away from the inner end of the pole piece is misplaced, it can smoothly pass through the second channel to connect with the current collecting component, which is beneficial to improving the reliability of the battery cell.

[0025] 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

[0026] 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.

[0027] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0028] Figure 2 An exploded view of a battery provided in some embodiments of the present application;

[0029] Figure 3 An exploded view of a battery module provided in some embodiments of the present application;

[0030] Figure 4 A cross-sectional view of a battery cell provided in some embodiments of the present application;

[0031] Figure 5 A disassembled diagram of a battery cell provided in some embodiments of the present application;

[0032] Figure 6 A schematic diagram of the structure of a current collecting component provided in some embodiments of the present application;

[0033] Figure 7 A schematic diagram of the structure of a current collecting component provided in some other embodiments of the present application;

[0034] Figure 8 A schematic diagram of the structure of a current collecting component provided in some further embodiments of the present application;

[0035] Fig. 9 A schematic diagram of the structure of an electrode assembly provided in some embodiments of the present application;

[0036] Fig.10 A schematic diagram of the structure of an insulating member provided in some 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. Channel; 5011. First channel; 5012. Second channel; 50121. First part; 50122. Second part; 502. Through hole; 60. Adapter; 70. Insulator; 701. Third channel; 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 skeleton 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] In the cylindrical battery cells of the related art, a current collecting component is usually provided, and the multiple tabs in the pole piece are usually firmly connected to the current collecting component by passing through the current collecting component and then welding to the side of the current collecting component. Since the pole piece in the cylindrical battery cell is usually wound, the tabs on the pole piece may be misaligned (miss the preset position) during the winding process, and the tabs on the pole piece closer to the outer ring are more likely to be misaligned, making it difficult for the current collecting component to align with the tabs, making it difficult for the tabs to pass through the current collecting component smoothly, causing abnormal connection and reducing the reliability of the battery cell.

[0069] In order to enable the pole ear to be well aligned with the current collecting component, 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 piece and a current collecting component, the electrode assembly is accommodated in the shell, the pole sheet in the electrode assembly is wound along a winding direction and has a plurality of pole ears at its end in a first direction, the first direction is perpendicular to the winding direction, the current collecting component is electrically connected to the electrode lead-out piece arranged on the shell, the current collecting component is provided with a plurality of channels passing through the current collecting component along the first direction, each pole ear passes through the channel and is connected to the current collecting component, the plurality of channels include a first channel and a second channel, in the winding direction, the pole ear passing through the first channel is closer to the inner end of the pole sheet 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, 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 current collecting component 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 away from the inner end of the pole piece passes is larger in the winding direction, even if the pole ear farther away from the inner end of the pole piece is misplaced, it can smoothly pass through the second channel to connect with the current collecting component, 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 1 As 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 5 As shown, the battery cell 7 includes a housing 20, an electrode assembly 30, an electrode lead-out member 40 and a current collecting member 50. The electrode assembly 30 is accommodated in the housing 20. The electrode assembly 30 includes a pole piece 301. The pole piece 301 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. The first direction Y is perpendicular to the winding direction X. The electrode lead-out member 40 is disposed on the housing 20. The current collecting member 50 is electrically connected to the electrode lead-out member 40. The current collecting member 50 is provided with a plurality of channels 501. Each channel 501 passes through the current collecting member 50 along the first direction Y. Each pole ear 3012 passes through the channel 501 and is connected to the current collecting member 50. Figure 6 As shown, the multiple channels 501 include a first channel 5011 and a second channel 5012. In the winding direction X, the pole ear 3012 passing through the first channel 5011 is closer to the inner end of the pole piece 301 than the pole ear 3012 passing through the second channel 5012; along the winding direction X, the length of the first channel 5011 is T1, the length of the second channel 5012 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 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.

[0099] The channel 501 may be a structure opened on the current collecting member 50 , which penetrates the current collecting member 50 along the first direction Y, so that the electrode tab 3012 can pass through the current collecting member 50 via the channel 501 .

[0100] Each pole lug 3012 passes through the channel 501 and is connected to the current collecting member 50, and each pole lug 3012 may pass through the channel 501 from one side of the current collecting member 50 to the other side of the current collecting member 50 along the first direction Y. The pole lug 3012 may be connected to the inner wall of the channel 501 to achieve connection with the current collecting member 50, or may be bent and connected to the side of the current collecting member 50 facing the first direction Y to achieve connection with the current collecting member 50. Exemplarily, each pole lug 3012 may pass through the channel 501 one by one, so that one pole lug 3012 passes through one channel 501; or multiple pole lugs 3012 may pass through at least one channel 501, which is conducive to reducing the number of channels 501 and simplifying the processing of the current collecting member 50.

[0101] The first channel 5011 and the second channel 5012 may be two different channels 501 among the multiple channels 501. The pole ear 3012 passing through the first channel 5011 is closer to the inner end of the pole piece 301 than the pole ear 3012 passing through the second channel 5012. The first channel 5011 may be closer to the inner end of the pole piece 301 than the second channel 5012, so that the pole ear 3012 passing through the first channel 5011 is closer to the inner end of the pole piece 301 than the pole ear 3012 passing through the second channel 5012. The length T1 of the first channel 5011 in the winding direction X is the length of the inner side of the two opposite ends of the first channel 5011 in the winding direction X, and the length T2 of the second channel 5012 in the winding direction X is the length of the inner side of the two opposite ends of the second channel 5012 in the winding direction X. The length of the second channel 5012 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 5011 in the winding direction X is smaller, so that the first channel 5011 can define the position of the pole lug 3012 more accurately, so that the first channel 5011 with a smaller length in the winding direction X can position the current collecting member 50 more accurately; at the same time, the active space of the pole lug 3012 passing through the second channel 5012 in the winding direction X is larger, so that the second channel 5012 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 5012 even if it is misplaced.

[0102] In the above structure, since the length T1 of the first channel 5011 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 current collecting component 50 through the first channel 5011 with a smaller length in the winding direction X; at the same time, since the length T2 of the second channel 5012 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 5012 to connect with the current collecting component 50, which is beneficial to improving the reliability of the battery cell 7.

[0103] In some embodiments, the battery cell 7 further includes a converter 60 , the current collecting member 50 and the electrode lead-out member 40 are spaced apart along the first direction Y, and the converter 60 connects the electrode lead-out member 40 and the current collecting member 50 .

[0104] The adapter 60 may be a member for connecting the current collecting member 50 with the electrode lead-out member 40. Since the current collecting member 50 and the electrode lead-out member 40 are spaced apart in the first direction Y, the adapter 60 can conveniently electrically connect the current collecting member 50 with the electrode lead-out member 40.

[0105] Exemplarily, the adapter 60 can be connected to the current collecting component 50 by welding. Welding can melt the materials of the adapter 60 and the current collecting component 50 together, which is not only beneficial to improve the connection strength between the adapter 60 and the current collecting component 50, 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.

[0106] In some embodiments, the adapter 60 can be connected to the current collecting member 50 by laser welding. Since laser welding has the characteristics of small heat affected zone and easy automation control, connecting the adapter 60 to the current collecting member 50 by laser welding is not only conducive to improving welding quality, but also conducive to improving production efficiency.

[0107] In some embodiments, Figure 7 As shown, the adapter 60 and the current collecting member 50 are an integrally formed structure. The adapter 60 and the current collecting member 50 can be made by an integrally formed processing method such as a stamping process, so that the adapter 60 and the current collecting member 50 can be synchronously manufactured as a whole, which not only makes the processing and manufacturing of the adapter 60 and the current collecting member 50 convenient, but also makes the overall structure formed by the adapter 60 and the current collecting member 50 have good strength; the adapter 60 and the current collecting member 50 can also be made by a mechanical processing method such as a die cutting process by processing a whole piece of blank, so that the overall structure formed by the adapter 60 and the current collecting member 50 has a lower processing difficulty and processing cost.

[0108] In some embodiments, the end of the adapter 60 away from the current collecting member 50 is welded to the electrode lead-out member 40 .

[0109] Since welding can melt the materials of the adapter 60 and the electrode lead-out member 40 together, it is not only beneficial to improve the connection strength between the adapter 60 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.

[0110] In some embodiments, the adapter 60 can be connected to the electrode lead-out member 40 by laser welding. Since laser welding has the characteristics of small heat-affected zone and easy automation control, connecting the adapter 60 to the electrode lead-out member 40 by laser welding is not only conducive to improving welding quality, but also conducive to improving production efficiency.

[0111] In some embodiments, the current collecting member 50 is provided with a through hole 502 penetrating along the first direction Y, the electrode assembly 30 has a central hole 302 , and the through hole 502 and the central hole 302 are arranged opposite to each other in the first direction Y.

[0112] The central 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 502 may be a hole-like structure formed by removing material on the current collecting member 50, which penetrates the current collecting member 50 along the first direction Y. The through hole 502 and the central hole 302 are arranged opposite to each other in the first direction Y, and may be that along the first direction Y, the through hole 502 and the central hole 302 at least partially overlap, so that the through hole 502 and the central hole 302 can be connected, and can serve as a channel 501 for injecting electrolyte. Exemplarily, the through hole 502 and the central hole 302 may be coaxially arranged so that the through hole 502 and the central hole 302 are directly opposite to each other, so as to facilitate the arrangement of the relative positions of the electrode assembly 30 and the current collecting member 50.

[0113] Exemplarily, the through hole 502 may be manufactured simultaneously with the current collecting member 50 by a stamping process, which is beneficial to improving the processing efficiency of the current collecting member 50 .

[0114] In some embodiments, the minimum distance between the first channel 5011 and the through hole 502 along the radial direction of the electrode assembly 30 is L1, and the radial dimension of the electrode assembly 30 is L2.

[0115] 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 5011 and the through hole 502 in the radial direction of the electrode assembly 30 may refer to the shortest distance between the edge of the first channel 5011 and the edge of the through hole 502. The position of the first channel 5011 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 5011 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 5011 is not easy to be misplaced, and the cooperation between the pole ear 3012 passing through the first channel 5011 and the first channel 5011 can better position the current collecting component 50, which is beneficial to improving the positioning accuracy of the current collecting component 50.

[0116] In some embodiments, the first channel 5011 is a rectangular channel 501 .

[0117] The rectangular channel 501 may refer to a channel 501 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 5011 as a rectangular channel 501, when the pole lug 3012 extending from the pole piece 301 is inserted into the first channel 5011, the cooperation between the first channel 5011 and the pole lug 3012 can better limit the rotation of the current collecting member 50, which helps to improve the positioning effect of the current collecting member 50.

[0118] Exemplarily, the first channel 5011 may also be configured as a channel 501 of other shapes other than the arc-shaped channel 501 , such as a triangular channel 501 , so that the first channel 5011 can better restrict the movement of the pole ear 3012 passing through the first channel 5011 .

[0119] In some embodiments, the second channel 5012 is an arc-shaped channel 501 , and the arc-shaped channel 501 extends along the winding direction X.

[0120] The arc-shaped channel 501 may refer to a channel 501 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 5012 as the arc-shaped channel 501 and extending along the winding direction X, the pole ear 3012 can pass through the second channel 5012 even if it is misaligned in the winding direction X during the winding process of the pole piece 301, so as to be connected to the current collecting member 50.

[0121] In some embodiments, in the radial direction of the electrode assembly 30 , the first channel 5011 and the second channel 5012 at least partially overlap.

[0122] By making the first channel 5011 and the second channel 5012 at least partially overlap in the radial direction of the electrode assembly 30, the second channel 5012 has a sufficient length in the winding direction X, so that the electrode tab 3012 can smoothly pass through the second channel 5012, and even if it is misaligned in the winding direction X, it can still pass through the second channel 5012 to be connected to the current collecting member 50.

[0123] 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.

[0124] 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.

[0125] In some embodiments, in the radial direction of the electrode assembly 30 , two adjacent second channels 5012 at least partially overlap.

[0126] By making two adjacent second channels 5012 at least partially overlap in the radial direction of the electrode assembly 30, the second channel 5012 has a sufficient length in the winding direction X, so that the electrode tab 3012 can smoothly pass through the second channel 5012, and even if it is misaligned in the winding direction X, it can still pass through the second channel 5012 to be connected to the current collecting member 50.

[0127] In some embodiments, Figure 8 As shown, the second channel 5012 includes a first portion 50121 and a second portion 50122 connected along the winding direction X; in the radial direction of the electrode assembly 30, the size of the second portion 50122 is H2, the size of the first portion 50121 is H1, and H1>H2.

[0128] The first portion 50121 and the second portion 50122 are different portions in the second channel 5012 that are connected to each other, and the two portions are connected along the winding direction X. Exemplarily, two second portions 50122 are provided, and the two second portions 50122 are connected to both ends of the first portion 50121 in the winding direction X, respectively.

[0129] The size of the second portion 50122 in the radial direction of the electrode assembly 30 is set to H2, and the size of the first portion 50121 in the radial direction of the electrode assembly 30 is set to H1. By making H1>H2, the second channel 5012 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 5012 by passing through the first portion 50121, so that the electrode tab 3012 can pass through the second channel 5012 more easily and smoothly, and is convenient for connection with the current collecting component 50.

[0130] In some embodiments, at least one channel 501 is a groove recessed inward from the outer circumference of the current collecting member 50 .

[0131] At least one channel 501 is a groove recessed inward from the outer peripheral surface of the current collecting component 50, which may mean that the second channel 5012 located at the outermost side in the radial direction of the current collecting component 50 is formed by a groove recessed inward from the outer peripheral surface of the current collecting component 50, and the second channel 5012 can be connected to the outer peripheral surface of the current collecting component 50, so that the pole ear 3012 on the pole piece 301 of the outermost circle can smoothly pass through the second channel 5012 connected to the outer peripheral surface of the current collecting component 50, so as to be firmly connected to the current collecting component 50.

[0132] In some embodiments, the tab 3012 is welded to the current collecting member 50 .

[0133] Since welding can melt the materials of the pole tab 3012 and the current collecting member 50 together, it is not only beneficial to improve the connection strength between the pole tab 3012 and the current collecting member 50, 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.

[0134] In some embodiments, the tab 3012 can be connected to the current collecting member 50 by laser welding. Since laser welding has the characteristics of small heat affected zone and easy automation control, connecting the tab 3012 to the current collecting member 50 by laser welding is not only conducive to improving welding quality, but also conducive to improving production efficiency.

[0135] Exemplarily, the electrode tab 3012 is connected to the side of the current collecting member 50 facing the electrode lead-out member 40 by welding.

[0136] In some embodiments, the battery cell 7 further includes an insulating member 70, such as Fig. 9 As shown, the pole piece 301 further includes a pole piece body 3011 connected to the pole ear 3012, and the insulating member 70 is disposed between the pole piece body 3011 and the current collecting member 50. Fig.10 As shown, the insulating member 70 is provided with a third channel 701 penetrating along the first direction Y, and the electrode tab 3012 passes through the third channel 701 to be connected with the current collecting member 50 .

[0137] 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.

[0138] The insulating member 70 may be a sheet-like component with insulating properties. The insulating member 70 is disposed between the pole piece body 3011 and the current collecting member 50, so as to achieve insulation isolation between the pole piece body 3011 and the current collecting member 50. The third channel 701 may be a hole-like structure that is opened on the insulating member 70 and penetrates in the first direction Y. A plurality of third channels 701 are disposed in one-to-one correspondence with a plurality of channels 501. The pole tab 3012 passes through the third channel 701 and the channel 501 and is connected to the current collecting member 50, so that the pole tab 3012 is connected to the electrode lead-out member 40 through the current collecting member 50 and the adapter 60.

[0139] In some embodiments, the electrode assembly 30 is configured as a cylindrical wound structure.

[0140] The electrode sheet 301 and the separator 303 in the electrode assembly 30 are wound to form a cylindrical winding structure.

[0141] Some embodiments of the present application further provide a battery 2, which includes a battery cell 7 provided by the above technical solution.

[0142] 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.

[0143] 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, a current collecting member 50, an adapter 60, and an insulating member 70. The electrode assembly 30, the current collecting member 50, the adapter 60, and the insulating member 70 are accommodated in the housing 20. The adapter 60 is connected between the current collecting member 50 and the electrode lead-out member 40. The pole piece 301 in the electrode assembly 30 is wound along the winding direction X. A plurality of pole ears 3012 at the end of the pole piece body 3011 in the first direction Y pass through the channel 501 and are connected to the current collecting member 50. The pole piece body 3011, the insulating member 70, the current collecting member 50, and the electrode lead-out member 40 are sequentially arranged along the first direction Y. The plurality of channels 501 are divided into a first channel 5011 and a second channel 5012. In the winding direction X, the pole ear 3012 passing through the first channel 5011 is closer to the inner end of the pole piece 301 than the pole ear 3012 passing through the second channel 5012. The length of the first channel 5011 along the winding direction X is T1, and the length of the second channel 5012 along the winding direction X is T2, and T2>T1. The first channel 5011 is configured as a rectangular channel 501, and the second channel 5012 is configured as an arc-shaped channel 501 extending along the winding direction X. The first channel 5011 and the second channel 5012 at least partially overlap in the radial direction of the electrode assembly 30, and two adjacent second channels 5012 at least partially overlap in the radial direction of the electrode assembly 30. The second channel 5012 includes a first portion 50121 and a second portion 50122, and the first portion 50121 has a larger size in the radial direction of the electrode assembly 30 than the second portion 50122. Since the length T1 of the first channel 5011 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 with the current collecting component 50 through the first channel 5011 with a smaller length in the winding direction X; at the same time, since the length T2 of the second channel 5012 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 5012 to be connected with the current collecting component 50, which is beneficial to improving the reliability of the battery cell 7.

[0144] 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, arranged on the housing; A current collecting member, electrically connected to the electrode lead-out member, the current collecting member is provided with a plurality of channels, each of the channels penetrates the current collecting member along the first direction, each of the electrode tabs passes through the channel and is connected to the current collecting member; The plurality of channels include a first channel and a second channel, and in the winding direction, the pole lug passing through the first channel is closer to the inner end of the pole piece than the pole lug 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 battery cell further includes a transition piece, the current collecting member and the electrode lead-out member are spaced apart along the first direction, and the transition piece connects the electrode lead-out member and the current collecting member.

3. The battery cell according to claim 2, characterized in that: The end of the adapter away from the current collecting member is welded to the electrode lead-out member.

4. The battery cell according to claim 2, characterized in that: The current collecting 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.

5. The battery cell according to claim 4, 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.

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

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

8. 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.

9. 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.

10. 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.

11. 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.

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

13. The battery cell according to claim 1, characterized in that: The electrode tab is welded to the current collecting component.

14. The battery cell according to claim 1, characterized in that: The battery cell further includes an insulating member, the pole piece further includes a pole piece body connected to the pole lug, the insulating member is arranged between the pole piece body and the current collecting component, the insulating member is provided with a third channel penetrating along the first direction, and the pole lug is connected to the current collecting component through the third channel.

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

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

17. An electrical device, characterized in that: Comprising a battery as claimed in claim 16, the battery is used to provide electrical energy.

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