Battery monomer, battery and electric device

Abstract

Some embodiments of the present application provide a battery monomer, a battery and a power utilization device, an electrode assembly in the battery monomer is accommodated in a housing, the electrode assembly comprises an electrode main body and a plurality of tabs, and the tabs are led out from an end portion of the electrode main body along a first direction; the current collecting piece is arranged between the electrode main body and the electrode leading-out piece; the adapter is connected between the current collecting piece and the electrode leading-out piece, the current collecting piece is provided with a plurality of channels penetrating in the first direction, and the tabs penetrate through the channels and are connected to the current collecting piece; and at least one tab is bent towards the direction close to the connecting part. As at least one of the tabs which pass through the channel and are connected with the current collector is bent towards the direction close to the connecting part, the connecting part of the bent tab and the current collector is closer to the connecting part of the adapter and the current collector, and the path of current flowing from the connecting part of the tab and the current collector to the connecting part of the adapter and the current collector is shortened; and the power performance of the battery monomer can be 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 power performance are getting higher and higher. How to improve the power performance 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 has good power performance.

[0005] In the first aspect, some embodiments of the present application provide a battery cell, which includes a shell, an electrode assembly, an electrode lead-out piece, a current collecting piece and a converter, wherein the electrode assembly is accommodated in the shell, the electrode assembly includes an electrode body and a plurality of pole ears, and the pole ears are led out from the end of the electrode body along a first direction; the electrode lead-out piece is arranged in the shell; the current collecting piece is arranged between the electrode body and the electrode lead-out piece, and the current collecting piece includes a connecting portion connected to the electrode lead-out piece; the converter is connected between the connecting portion and the electrode lead-out piece, and the current collecting piece is provided with a plurality of channels passing through the first direction, and each pole ear passes through the channel and is connected to the current collecting piece; wherein at least one pole ear is bent in a direction close to the connecting portion.

[0006] In the above structure, since at least one of the pole ears connected to the current collector through the channel is bent in the direction close to the connecting portion, the connection between the pole ear and the current collector is closer to the connection between the adapter and the current collector after bending, shortening the path of the current flowing from the connection between the pole ear and the current collector to the connection between the adapter and the current collector, which is beneficial to improving the power performance of the battery cell.

[0007] According to the battery cells provided in some embodiments of the present application, the pole ear includes a first part and a second part connected to the first part, the second part is bent relative to the first part and connected to the current collector, the end of the first part away from the second part is connected to the electrode body, and the second part of at least one pole ear is bent toward a side close to the adapter, so that the second part can be conveniently connected to the side of the current collector away from the electrode body, making the connection between the pole ear and the current collector convenient.

[0008] According to the battery cell provided in some embodiments of the present application, the second portion is welded to the current collector, which is not only beneficial to improving the connection strength between the second portion and the current collector, but also beneficial to reducing the resistance at the connection between the two, which helps to improve the power performance of the battery cell.

[0009] According to the battery cell provided in some embodiments of the present application, the second portion and the adapter are respectively connected to two opposite side surfaces of the current collector in the first direction, so that the connection between the second portion and the current collector is not likely to affect the connection between the adapter and the current collector.

[0010] According to the battery cell provided in some embodiments of the present application, the connection between the second portion of at least one pole ear and the current collector and the connection between the adapter and the current collector are arranged relative to each other in a first direction, so that the current flow path between at least one pole ear and the adapter is shorter, which is beneficial to improving the power performance of the battery cell.

[0011] According to the battery cells provided in some embodiments of the present application, the current collector and the adapter are an integrally formed structure, which not only facilitates the processing and manufacturing of the adapter and the current collector, but also makes the overall structure formed by the adapter and the current collector have good strength.

[0012] According to the battery cells provided in some embodiments of the present application, at least one channel is a groove sunken inward from the outer circumferential surface of the current collector, and the notch of the groove is oriented away from the connection between the adapter and the current collector, so that the second part of the pole ear passing through the groove is close to the connection between the adapter and the current collector relative to the first part, which is beneficial to shortening the current path between the pole ear passing through the groove and the adapter.

[0013] According to the battery cell provided in some embodiments of the present application, the electrode body includes a pole piece body connected to the pole piece body, the pole piece body is wound along a winding direction, the first direction is perpendicular to the winding direction, and the multiple channels include a first channel and a second channel, in the winding direction, the pole piece passing through the first channel is closer to the inner end of the pole piece body than the pole piece 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, T2>T1, so that the pole piece passing through the first channel has a smaller movable space in the winding direction, so that the first channel can define the position of the pole piece more accurately, so that the first channel with a smaller length in the winding direction can position the current collector more accurately; at the same time, the pole piece passing through the second channel has a larger movable space in the winding direction, so that the second channel can better accommodate the pole piece that is misplaced in the winding direction, so that the pole piece can smoothly pass through the second channel even if it is misplaced.

[0014] According to the battery cells provided in some embodiments of the present application, the current collector 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.

[0015] 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 cooperation between the first channel and the pole ear can better limit the rotation of the current collecting member, which helps to improve the positioning effect of the current collecting member.

[0016] 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 piece, so as to be connected to the current collector.

[0017] 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, and 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 collector.

[0018] According to the battery cell provided in some embodiments of the present application, the battery cell further includes an insulating member, the electrode body includes a pole piece body connected to the pole lug, the insulating member is arranged between the pole piece body and the current collector, the insulating member is provided with a third channel penetrating along the first direction, and the pole lug is connected to the current collector through the third channel. The insulating member can achieve insulation isolation between the pole piece body and the current collector while also connecting the pole lug to the current collector.

[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, which includes a battery cell 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 housing, an electrode assembly, an electrode lead-out member, a current collector, and an adapter. The electrode assembly is contained in the housing, and the electrode assembly includes an electrode body and a plurality of tabs, which are led out from the end of the electrode body along a first direction. The electrode lead-out member is disposed in the housing. The current collector is disposed between the electrode body and the electrode lead-out member, and the current collector includes a connecting portion connected to the electrode lead-out member. The adapter is connected between the connecting portion and the electrode lead-out member, and the current collector is provided with a plurality of channels passing through along a first direction, and each tab passes through the channel and is connected to the current collector. At least one tab is bent toward a direction close to the connecting portion. In the above structure, since at least one of the tabs connected to the current collector through the channel is bent toward a direction close to the connecting portion, after bending, the connection between the tab and the current collector is closer to the connection between the adapter and the current collector, shortening the path of the current flowing from the connection between the tab and the current collector to the connection between the adapter and the current collector, which is beneficial to improving the power performance 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 3 An 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 after the pole lugs, current collectors and adapters provided in some embodiments of the present application are connected;

[0032] Figure 7 A schematic diagram of the structure of an electrode assembly provided in some embodiments of the present application;

[0033] Figure 8 for Figure 6 Sectional view at AA in the middle;

[0034] Fig. 9 A schematic diagram of the structure of the electrode tabs, current collectors and adapters provided in other embodiments of the present application after being connected;

[0035] Fig.10 for Figure 6 Cross-sectional view at BB in the middle.

[0036] In the attached picture:

[0037] 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; 30121. First part; 30122. Second part; 302. Center hole; 303. Isolator; 304. Electrode body; 40. Electrode lead-out piece; 50. Current collector; 501. Channel; 5011. First channel; 5012. Second channel; 502. Through hole; 503. Connecting part; 60. Adapter; 70. Insulator; 701. Third channel; X. Winding direction; Y. First direction. DETAILED DESCRIPTION

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] The term "plurality" used in the present application refers to two or more (including two).

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] In some embodiments, the liquid electrolyte includes an electrolyte salt and a solvent.

[0053] 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.

[0054] 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.

[0055] The gel electrolyte includes a polymer-based electrolyte skeleton network combined with an ionic liquid-lithium salt.

[0056] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0057] 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.

[0058] 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 phosphide, germanium argentum sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0059] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0060] In some embodiments, the electrode assembly is a wound structure. Optionally, the electrode assembly is a cylindrical wound structure.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0067] In the related art, a cylindrical battery cell is usually provided with a current collector, and multiple tabs in the pole piece are usually welded to the side of the current collector to firmly connect with the current collector, so as to realize the electrical connection between the tabs and the electrode lead-out piece. For the convenience of welding, the welding position of the tabs and the current collector is usually set randomly, which makes the path of the current flowing from the tabs to the electrode lead-out piece longer, which is not conducive to improving the power performance of the battery cell.

[0068] In order to shorten the path of current flowing from the electrode tab to the electrode lead-out piece and improve the power performance 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, a current collector and a converter, the electrode assembly being accommodated in the shell, the electrode assembly including an electrode body and a plurality of electrode tabs, the electrode tabs being led out from the ends of the electrode body along a first direction; the electrode lead-out piece being arranged in the shell; the current collector being arranged between the electrode body and the electrode lead-out piece, the current collector including a connecting portion connected to the electrode lead-out piece; the converter being connected between the connecting portion and the electrode lead-out piece, the current collector being provided with a plurality of channels penetrating along a first direction, each electrode tab passing through the channel and being connected to the current collector; wherein at least one electrode tab is bent toward a direction close to the connecting portion. In the above structure, since at least one of the pole ears connected to the current collector through the channel is bent in the direction close to the connecting portion, the connection between the pole ear and the current collector is closer to the connection between the adapter and the current collector after bending, shortening the path of the current flowing from the connection between the pole ear and the current collector to the connection between the adapter and the current collector, which is beneficial to improving the power performance of the battery cell.

[0069] The battery cells described in the embodiments of the present application are suitable for use in batteries and electrical devices using the batteries.

[0070] 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.

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

[0072] Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application.

[0073] 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.

[0074] 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 .

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] Figure 3 for Figure 2 An exploded schematic diagram of a battery module 6 is shown.

[0082] 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.

[0083] 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 .

[0084] The battery cell 7 may be a cylindrical battery cell, a square battery cell, or a battery cell of other shapes.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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, a current collector 50 and an adapter 60. The electrode assembly 30 is accommodated in the housing 20. The electrode assembly 30 includes an electrode body 304 and a plurality of tabs 3012. The tabs 3012 are led out from the end of the electrode body 304 along the first direction Y. The electrode lead-out member 40 is disposed in the housing 20. The current collector 50 is disposed between the electrode body 304 and the electrode lead-out member 40. The current collector 50 includes a connecting portion 503 connected to the electrode lead-out member 40. The adapter 60 is connected between the connecting portion 503 and the electrode lead-out member 40. Figure 6 As shown, the current collector 50 is provided with a plurality of channels 501 penetrating along the first direction Y, and each pole lug 3012 passes through the channel 501 and is connected to the current collector 50 . Among them, at least one pole lug 3012 is bent toward a direction close to the connecting portion 503 .

[0089] 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.

[0090] The electrode assembly 30 may include an electrode sheet 301 and a separator 303. The electrode sheet 301 may include a positive electrode sheet or a negative electrode sheet with opposite polarities. The positive electrode sheet and the negative electrode sheet may be used as a positive electrode and a negative electrode, respectively. The separator 303 is stacked between the positive electrode sheet and the negative electrode sheet to separate the positive electrode sheet from the negative electrode sheet. Figure 7 As shown, the pole piece 301 includes a pole piece body 3011 and a pole ear 3012 connected to the end of the pole piece body 3011 in the first direction Y. The pole ear 3012 can be a part provided on the pole piece 301 for electrically connecting with the current collector of the battery cell 7. By providing the pole ear 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 ear 3012, so that the pole piece 301 is electrically connected to the electrode lead-out member 40. By providing a plurality of pole ears 3012 at intervals at the end of the pole piece 301 in the first direction Y, the pole piece 301 can be evenly and stably transferred with other components through the plurality of pole ears 3012.

[0091] The pole piece 301 and the separator 303 may be arranged in layers or wound in a winding direction X. The pole piece 301 and the separator 303 may be wound in the winding direction X, and the stacked positive pole piece, the negative pole piece and the separator 303 in the electrode assembly 30 may be wound in the winding direction X. The pole piece 301 is wound in the winding direction X, so that the electrode assembly 30 has a wound structure.

[0092] The electrode body 304 may refer to the main structural part in the electrode assembly 30 , which may include a pole piece body 3011 (a positive pole piece body and a negative pole piece body) and an isolation member 303 , and the pole ear 3012 is led out from the end of the pole piece body 3011 in the electrode body 304 along the first direction Y.

[0093] The first direction Y is perpendicular to the winding direction X, so that the tabs 3012 can be disposed at both ends of the electrode body 304 perpendicular to the winding direction X, which facilitates the arrangement of other components in the battery cell 7 at both ends of the electrode assembly 30 .

[0094] 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.

[0095] 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.

[0096] 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.

[0097] The current collector 50 may be a component for connecting multiple tabs 3012. The current collector 50 is provided with a connection portion 503, which is electrically connected to the electrode lead-out member 40, so that the electric energy output by the multiple tabs 3012 can be collected on the current collector 50 and then transmitted to the electrode lead-out member 40.

[0098] 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 tab 3012 can pass through the current collecting member 50 via the channel 501 .

[0099] The adapter 60 may be a member for connecting the connection portion 503 of the current collector 50 to the electrode lead-out member 40. The current collector 50 and the electrode lead-out member 40 are spaced apart in the first direction Y. The adapter 60 is connected between the current collector 50 and the electrode lead-out member 40, so that the current collector 50 can be conveniently electrically connected to the electrode lead-out member 40.

[0100] Each pole lug 3012 passes through the channel 501 and is connected to the current collector 50. Each pole lug 3012 may pass through the channel 501 from one side of the current collector 50 to the other side of the current collector 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 collector 50, or may be bent and connected to the side of the current collector 50 facing the first direction Y to achieve connection with the current collector 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 beneficial to reduce the number of channels 501 and simplify the processing of the current collector 50.

[0101] By bending at least one of the multiple pole ears 3012 toward the direction close to the connecting portion 503, the connection between the pole ear 3012 and the current collector 50 is made closer to the connecting portion 503, shortening the path of current flowing from the connection between the pole ear 3012 and the current collector 50 to the connecting portion 503, which is beneficial to improving the power performance of the battery cell 7.

[0102] In the above structure, since at least one of the pole ears 3012 connected to the current collector 50 through the channel 501 is bent in the direction close to the connecting portion 503, the connection between the pole ear 3012 and the current collector 50 after bending is closer to the connection between the adapter 60 and the current collector 50, shortening the path of the current flowing from the connection between the pole ear 3012 and the current collector 50 to the connection between the adapter 60 and the current collector 50, which is beneficial to improving the power performance of the battery cell 7.

[0103] In some embodiments, Figure 8 As shown, the pole ear 3012 includes a first part 30121 and a second part 30122 connected to the first part 30121, the second part 30122 is bent relative to the first part 30121 and connected to the current collecting member 50, the end of the first part 30121 away from the second part 30122 is connected to the electrode body 304, and the second part 30122 of at least one pole ear 3012 is bent toward the side close to the adapter 60.

[0104] The first part 30121 and the second part 30122 are two parts connected to each other in the tab 3012. By bending the second part 30122 relative to the first part 30121, the second part 30122 can be conveniently connected to the side of the current collector 50 away from the electrode body 304, so that the tab 3012 is conveniently connected to the current collector 50.

[0105] By connecting the end of the first portion 30121 away from the second portion 30122 to the electrode body 304 , the pole ear 3012 can smoothly pass through the channel 501 to achieve connection between the pole piece body 3011 in the electrode body 304 and the current collecting member 50 .

[0106] The second portion 30122 of at least one pole ear 3012 is bent toward the side close to the adapter 60 , which may be that the second portion 30122 of at least one pole ear 3012 is bent relative to the first portion 30121 and the second portion 30122 is closer to the adapter 60 than the first portion 30121 .

[0107] In some embodiments, the second portion 30122 is welded to the current collecting member 50 .

[0108] The second part 30122 is connected to the current collecting member 50 by welding. Welding can melt the materials of the second part 30122 and the current collecting member 50 together, which is not only beneficial to improve the connection strength between the second part 30122 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.

[0109] In some embodiments, the second portion 30122 can be connected to the current collector 50 by laser welding. Since laser welding has the characteristics of small heat-affected zone and easy automation control, the second portion 30122 is connected to the current collector 50 by laser welding, which is beneficial to improving welding quality and production efficiency.

[0110] In some embodiments, the second portion 30122 and the adapter 60 are respectively connected to two opposite side surfaces of the current collecting member 50 in the first direction Y.

[0111] By respectively connecting the second portion 30122 and the adapter 60 to two opposite side surfaces of the current collecting member 50 in the first direction Y, the connection between the second portion 30122 and the current collecting member 50 is less likely to affect the connection between the adapter 60 and the current collecting member 50 .

[0112] Exemplarily, the adapter 60 is connected to the current collector 50 by welding. Welding can melt the materials of the adapter 60 and the current collector 50 together, which is not only conducive to improving the connection strength between the adapter 60 and the current collector 50, but also conducive to reducing the resistance at the connection between the two, which helps to improve the power performance of the battery cell 7.

[0113] The adapter 60 can be connected to the current collector 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 collector 50 by laser welding is not only conducive to improving welding quality, but also conducive to improving production efficiency.

[0114] In some embodiments, a connection point between the second portion 30122 of at least one electrode tab 3012 and the current collecting member 50 and a connection point between the adapter 60 and the current collecting member 50 are arranged opposite to each other in the first direction Y.

[0115] The connection between the second part 30122 of at least one pole ear 3012 and the current collecting piece 50 and the connection between the adapter 60 and the current collecting piece 50 are arranged relative to each other in the first direction Y, which can mean that, in the first direction Y, the connection between the second part 30122 of at least one pole ear 3012 and the current collecting piece 50 and the connection between the adapter 60 and the current collecting piece 50 at least partially overlap, so that the current flow path between at least one pole ear 3012 and the adapter 60 is shorter, which is beneficial to improving the power performance of the battery cell 7.

[0116] In some embodiments, Fig. 9 and Fig.10 As shown, the current collecting member 50 and the adapter 60 are an integrally formed structure.

[0117] The adapter 60 and the current collector 50 are an integrally formed structure. The adapter 60 and the current collector 50 can be made by an integrally formed processing method such as a stamping process, so that the adapter 60 and the current collector 50 can be synchronously manufactured as a whole, which not only makes the processing and manufacturing of the adapter 60 and the current collector 50 convenient, but also makes the overall structure formed by the adapter 60 and the current collector 50 have good strength; the adapter 60 and the current collector 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 collector 50 has a lower processing difficulty and processing cost.

[0118] In some embodiments, at least one channel 501 is a groove sunken inward from the outer circumference of the current collecting member 50 , and the notch of the groove faces away from the connection between the adapter 60 and the current collecting member 50 .

[0119] At least one channel 501 is a groove recessed inward from the outer circumferential surface of the current collecting piece 50, which may mean that the channel 501 located on the outermost side of the current collecting piece 50 in the radial direction is formed by a groove recessed inward from the outer circumferential surface of the current collecting piece 50, and the channel 501 can be connected to the outer circumferential surface of the current collecting piece 50, so that the pole ear 3012 on the pole piece 301 of the outermost circle can smoothly pass through the channel 501 connected to the outer circumferential surface of the current collecting piece 50, so as to be firmly connected to the current collecting piece 50.

[0120] Since the second part 30122 of the pole ear 3012 passing through the groove is bent toward the inner side of the current collecting piece 50 and connected to the current collecting piece 50, by making the notch of the groove face away from the connection between the adapter 60 and the current collecting piece 50, the second part 30122 of the pole ear 3012 passing through the groove is close to the connection between the adapter 60 and the current collecting piece 50 relative to the first part 30121, which is beneficial to shortening the current path between the pole ear 3012 passing through the groove and the adapter 60.

[0121] In some embodiments, the electrode body 304 includes a pole piece body 3011 connected to the pole ear 3012, the pole piece body 3011 is wound along a winding direction X, the first direction Y is perpendicular to the winding direction X, and 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 body 3011 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, and the length of the second channel 5012 is T2, and T2>T1.

[0122] 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 ear 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 ear 3012 more accurately, so that the first channel 5011 with a smaller length in the winding direction X can position the current collector 50 more accurately; at the same time, the active space of the pole ear 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 ear 3012 that is misplaced in the winding direction X, so that the pole ear 3012 can smoothly pass through the second channel 5012 even if it is misplaced.

[0123] 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.

[0124] 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 collector 50, which penetrates the current collector 50 along the first direction Y. The through hole 502 and the central 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 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 can be coaxially arranged so that the through hole 502 and the central hole 302 are opposite to each other, which is convenient for arranging the relative positions of the electrode assembly 30 and the current collector 50.

[0125] Exemplarily, the through hole 502 can be simultaneously manufactured together with the current collecting member 50 by using a stamping process, which is beneficial to improving the processing efficiency of the current collecting member 50 .

[0126] In some embodiments, the first channel 5011 is a rectangular channel 501 .

[0127] 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 collector 50, which helps to improve the positioning effect of the current collector 50.

[0128] 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 .

[0129] 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.

[0130] 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 collector 50.

[0131] 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, and two adjacent second channels 5012 at least partially overlap.

[0132] By making the first channel 5011 and the second channel 5012 at least partially overlap in the radial direction of the electrode assembly 30, and making the 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 connect with the current collector 50.

[0133] 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.

[0134] 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.

[0135] In some embodiments, the battery cell 7 also includes an insulating member 70, the electrode body 304 includes a pole piece body 3011 connected to the pole ear 3012, the insulating member 70 is arranged between the pole piece body 3011 and the current collecting member 50, and the insulating member 70 is provided with a third channel 701 passing through the first direction Y, and the pole ear 3012 is connected to the current collecting member 50 through the third channel 701.

[0136] The insulating member 70 may be a sheet-shaped member having insulating properties. The insulating member 70 is disposed between the pole piece body 3011 and the current collecting member 50 to achieve insulation isolation between the pole piece body 3011 and the current collecting member 50 .

[0137] The third channel 701 can be a hole-like structure opened on the insulating member 70 and passing through the first direction Y. Multiple third channels 701 are arranged one by one corresponding to multiple channels 501. The pole ear 3012 passes through the third channel 701 and the channel 501 and is connected to the current collecting member 50, so that the pole ear 3012 is connected to the electrode lead-out member 40 through the current collecting member 50 and the adapter 60.

[0138] In some embodiments, the electrode assembly 30 is configured as a cylindrical wound structure.

[0139] The electrode sheet 301 and the separator 303 in the electrode assembly 30 are wound to form a cylindrical winding structure.

[0140] Some embodiments of the present application further provide a battery 2, which includes a battery cell 7 provided by the above technical solution.

[0141] 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.

[0142] 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 collector 50, a transition member 60, and an insulating member 70. The electrode assembly 30, the current collector 50, the transition member 60, and the insulating member 70 are accommodated in the housing 20. The transition member 60 is connected between the current collector 50 and the electrode lead-out member 40. The pole piece body 3011 of the electrode body 304 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 collector 50. The pole piece body 3011, the insulating member 70, the current collector 50, and the electrode lead-out member 40 are sequentially arranged along the first direction Y. The pole tab 3012 includes a first portion 30121 and a second portion 30122 connected to the first portion 30121. The second portion 30122 of at least one pole tab 3012 is bent toward a side close to the adapter 60 relative to the first portion 30121 and connected to the adapter 60. Since the second portion 30122 of at least one of the pole tabs 3012 is bent toward the connecting portion 503 relative to the first portion 30121, the connection between the second portion 30122 and the current collector 50 is closer to the connection between the adapter 60 and the current collector 50, shortening the path of the current flowing from the connection between the pole tab 3012 and the current collector 50 to the connection between the adapter 60 and the current collector 50, which is beneficial to improving the power performance of the battery cell 7.

[0143] 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 an electrode body and a plurality of tabs, wherein the tabs are led out from the end of the electrode body along a first direction; An electrode lead-out member, disposed on the housing; A current collector is disposed between the electrode body and the electrode lead-out member, and the current collector includes a connection portion connected to the electrode lead-out member; A transition piece is connected between the connecting portion and the electrode lead-out piece, the current collecting piece is provided with a plurality of channels penetrating along the first direction, each of the pole ears passes through the channels and is connected to the current collecting piece; wherein at least one of the pole ears is bent toward a direction close to the connecting portion.

2. The battery cell according to claim 1, characterized in that: The electrode tab includes a first part and a second part connected to the first part, the second part is bent relative to the first part and connected to the current collector, the end of the first part away from the second part is connected to the electrode body, and the second part of at least one of the electrode tabs is bent toward a side close to the adapter.

3. The battery cell according to claim 2, characterized in that: The second portion is welded to the current collecting member.

4. The battery cell according to claim 2, characterized in that: The second portion and the adapter are respectively connected to two opposite side surfaces of the current collecting member in the first direction.

5. The battery cell according to claim 4, characterized in that: A connection point between the second portion of at least one of the electrode tabs and the current collecting member and a connection point between the adapter and the current collecting member are arranged opposite to each other in the first direction.

6. The battery cell according to claim 1, characterized in that: The current collecting member and the adapter member are an integrally formed structure.

7. The battery cell according to claim 1, characterized in that: At least one of the channels is a groove sunken inward from the outer circumference of the current collecting member, and the notch of the groove faces away from the connection between the adapter and the current collecting member.

8. The battery cell according to claim 1, characterized in that: The electrode body comprises a pole piece body connected to the pole lug, the pole piece body is wound along a winding direction, the first direction is perpendicular to the winding direction, the plurality of channels comprises a first channel and a second channel, in the winding direction, the pole lug passing through the first channel is closer to the inner end of the pole piece body 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.

9. The battery cell according to claim 8, characterized in that: The first channel is a rectangular channel.

10. The battery cell according to claim 8, characterized in that: The second channel is an arc-shaped channel, and the arc-shaped channel extends along the winding direction.

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

12. The battery cell according to claim 1, 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.

13. The battery cell according to claim 1, characterized in that: The battery cell also includes an insulating member, the electrode body includes a pole piece body connected to the pole lug, the insulating member is arranged between the pole piece body and the current collector, the insulating member is provided with a third channel passing through along the first direction, and the pole lug is connected to the current collector through the third 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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