Battery monomer, battery and electric equipment

Abstract

The embodiment of the utility model provides a battery monomer, a battery and electric equipment. The battery comprises an electrode assembly, an electrode leading-out part, a current collecting component and a limiting part, the current collecting component is electrically connected with the electrode assembly and the electrode leading-out part, the current collecting component is arranged between the electrode assembly and the electrode leading-out part in a folding mode, and the current collecting component comprises a first folding part and a second folding part which are arranged adjacently. The limiting piece is arranged on the flow collecting component and is configured to be capable of limiting the first folding part to turn over in the direction away from the second folding part relative to the second folding part. The electrode leading-out part and the electrode assembly are electrically connected through the current collecting component. The first folding part is adjacent to the second folding part, and the limiting piece can limit the overturning of the first folding part and reduce the risk that the first folding part and the second folding part are separated due to the overturning of the first folding part and the second folding part, so that the electric connection between the electrode leading-out part and the electrode assembly is maintained, and the structural stability of the battery monomer 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] With the development of new energy technology, batteries are used more and more widely, such as in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc.

[0003] In the development of battery technology, in addition to improving the performance of battery cells, the service life of battery cells is also an issue that needs to be considered. Therefore, how to improve the service life of battery cells is an issue that needs to be improved in battery technology. Utility Model Content

[0004] The embodiments of the present application provide a battery cell, a battery, and an electrical device for increasing the service life of the battery cell.

[0005] In a first aspect, an embodiment of the present application provides a battery, comprising an electrode assembly, an electrode lead-out portion, a current collecting member and a limiter; the electrode lead-out portion is used to input or output electrical energy of a battery cell; the current collecting member electrically connects the electrode assembly and the electrode lead-out portion, the current collecting member is folded and arranged between the electrode assembly and the electrode lead-out portion, the current collecting member comprises a first folding portion and a second folding portion, the first folding portion and the second folding portion are connected to each other and arranged adjacent to each other; the limiter is arranged on the current collecting member, and the limiter is configured to be able to limit the first folding portion from flipping relative to the second folding portion in a direction away from the second folding portion.

[0006] In the above technical solution, the electrode lead-out portion and the electrode assembly are electrically connected through the current collecting member. The first folding portion is arranged adjacent to the second folding portion, and the limiter can limit the first folding portion from flipping relative to the second folding portion in a direction away from the second folding portion, thereby limiting the angle between the first folding portion and the second folding portion, thereby reducing the risk of the current collecting member breaking at the connection between the first folding portion and the second folding portion due to the angle between the first folding portion and the second folding portion being too large, reducing the risk of failure of the electrical connection between the electrode lead-out portion and the electrode assembly, and increasing the service life of the battery cell.

[0007] In some embodiments, the stopper connects the first folding part and the second folding part. By connecting the first folding part and the second folding part with the stopper, the connection strength between the first folding part and the second folding part can be improved, and the first folding part can be limited from flipping relative to the second folding part in a direction away from the second folding part, thereby reducing the risk of the first folding part and the second folding part being broken and separated, and improving the structural stability of the battery cell.

[0008] In some embodiments, the first folding portion is provided with a first through hole, and the second folding portion is provided with a second through hole; the limiting member includes a rod, a first limiting portion and a second limiting portion; the rod is inserted through the first through hole and the second through hole; the first limiting portion and the second limiting portion are respectively connected to opposite ends of the rod, the first limiting portion is located at a side of the first folding portion away from the second folding portion, and the second limiting portion is located at a side of the second folding portion away from the first folding portion, and the first limiting portion and the second limiting portion are configured to: when the first limiting portion and the second limiting portion abut against the first folding portion and the second folding portion, respectively, limit the first folding portion from flipping in a direction away from the second folding portion relative to the second folding portion. By inserting the rod through the first through hole and the second through hole, and making the first limiting portion located at a side of the first folding portion away from the second folding portion, and the second limiting portion located at a side of the second folding portion away from the first folding portion, the first limiting portion and the second limiting portion can limit the first folding portion from flipping in a direction away from the second folding portion relative to the second folding portion, thereby reducing the risk of the first folding portion and the second folding portion being broken and separated, and improving the structural stability of the battery cell.

[0009] In some embodiments, the first folding portion is connected to the electrode assembly, the electrode assembly has a central hole, and the first limiting portion is located in the central hole. The first limiting portion is located in the central hole, which can make the position of the limiting member and the electrode assembly relatively stable. Since the limiting member is connected to the current collecting member, the position of the current collecting member and the electrode assembly is relatively stable, reducing the risk of the current collecting member detaching from the electrode assembly.

[0010] In some embodiments, the stopper is a thermosetting elastomer. The stopper can absorb vibration and impact between the first folded portion and the second folded portion, thereby reducing the risk of damage to the current collecting component.

[0011] In some embodiments, the stopper includes a first adhesive layer bonded to the first folding portion and the second folding portion. By providing the first adhesive layer between the first folding portion and the second folding portion, the first adhesive layer can limit the first folding portion from flipping relative to the second folding portion in a direction away from the second folding portion, thereby reducing the risk of fracture at the connection between the first folding portion and the second folding portion, thereby maintaining the electrical connection between the electrode lead-out portion and the electrode assembly, and improving the structural stability of the battery cell.

[0012] In some embodiments, the current collecting component further includes a third folding portion, the second folding portion connects the first folding portion and the third folding portion; the limiting member further includes a second adhesive layer bonding the second folding portion and the third folding portion. The second adhesive layer connects the second folding portion and the third folding portion, thereby limiting the second folding portion from flipping relative to the third folding portion in a direction away from the third folding portion, reducing the risk of fracture between the second folding portion and the third folding portion, and improving the structural stability of the current collecting component.

[0013] In some embodiments, the current collecting member further includes a third folding portion, the second folding portion connects the first folding portion and the third folding portion, and the stopper connects the first folding portion and the third folding portion. The first folding portion and the third folding portion are connected by the stopper, and the second folding portion connects the first folding portion and the third folding portion, so that the stopper can limit the position of the first folding portion and the second folding portion, thereby reducing the risk of the first folding portion being damaged by flipping relative to the second folding portion in a direction away from the second folding portion.

[0014] In some embodiments, the position limiting member includes a first hook portion and a second hook portion, the first hook portion is connected to the first folding portion, the second hook portion is connected to the third folding portion, and the first hook portion and the second hook portion are configured to: when the first hook portion and the second hook portion are hooked and matched, the first folding portion is restricted from flipping in a direction away from the second folding portion relative to the second folding portion. By hooking and matching the first hook portion with the second hook portion, the first folding portion and the third folding portion can be restricted from moving away from each other, thereby restricting the first folding portion from flipping in a direction away from the second folding portion relative to the second folding portion, thereby improving the structural stability of the current collecting component.

[0015] In some embodiments, the second folding portion is provided with a third through hole, and at least one of the first hook portion and the second hook portion is passed through the third through hole. By providing the third through hole, the third through hole can guide the first hook portion or the second hook portion, which is conducive to the hooking and matching of the first hook portion and the second hook portion.

[0016] In some embodiments, the current collecting member further includes a third folded portion, the second folded portion connects the first folded portion and the third folded portion, the first folded portion is arranged opposite to the third folded portion, the first folded portion is connected to the electrode assembly, and the second folded portion is connected to the electrode lead-out portion.

[0017] In some embodiments, the limiting member is made of insulating material.

[0018] In some embodiments, the battery cell further includes a housing and an electrode terminal, the electrode assembly is accommodated in the housing, the electrode terminal is disposed on the housing, and the electrode terminal is an electrode lead-out portion.

[0019] In a second aspect, an embodiment of the present application provides a battery, comprising a battery cell provided by any embodiment of the first aspect.

[0020] In a third aspect, an embodiment of the present application provides an electrical device, comprising a battery cell provided by any embodiment of the first aspect or a battery provided by any embodiment of the second aspect, wherein the battery cell is used to provide electrical energy to the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0023] Figure 2 An exploded view of a battery provided for some embodiments of the present application;

[0024] Figure 3 An exploded view of a battery cell provided for some embodiments of the present application;

[0025] Figure 4 An exploded view of a battery cell provided in some other embodiments of the present application;

[0026] Figure 5 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application;

[0027] Figure 6 A schematic diagram of the structure of a current collecting component and a stopper provided in some embodiments of the present application;

[0028] Figure 7 A schematic diagram of the structure of a current collecting component and a limiting component provided in some other embodiments of the present application;

[0029] Figure 8 A schematic structural diagram of a current collecting component and a limiting component provided in some further embodiments of the present application.

[0030] Icon: 1000-vehicle; 100-battery; 10-battery cell; 1-current collecting member; 11-first folding portion; 111-first through hole; 112-first surface; 113-second surface; 12-second folding portion; 121-second through hole; 122-third surface; 123-fourth surface; 124-third through hole; 13-third folding portion; 131-fifth surface; 2-limiting member; 21-rod; 22-first limiting portion; 23-second limiting portion; 24-first adhesive Layer; 25-second adhesive layer; 26-first hook portion; 261-first hook; 27-second hook portion; 271-second hook; 3-housing; 31-shell; 311-opening; 32-end cover; 4-electrode assembly; 41-main body; 42-ear; 421-positive electrode ear; 422-negative electrode ear; 43-center hole; 5-electrode terminal; 6-electrode lead portion; 20-housing; 201-first part; 202-second part; 200-controller; 300-motor. DETAILED DESCRIPTION

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] The term "plurality" used in the present application refers to two or more (including two).

[0038] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0039] Battery cells include, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, and the like.

[0040] 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 reduce the risk of short circuit between the positive and negative electrodes, while allowing active ions to pass through.

[0041] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0042] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0043] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material base and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0044] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as positive electrode active materials for batteries can also be used. These positive electrode active materials can be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also referred to as NCM 333 )、LiNi 0.5 Co 0.2 Mn 0.3 O2 (also referred to as NCM 523 )、LiNi 0.5 Co 0.25 Mn 0.25 O2 (also referred to as NCM 211 )、LiNi 0.6 Co 0.2 Mn 0.2 O2 (also referred to as NCM 622 )、LiNi 0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O2) and its modified compounds, etc.

[0045] In some embodiments, the positive electrode may be a foamed metal. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, or a foamed alloy. When the foamed metal is used as the positive electrode, the positive electrode active material may not be provided on the surface of the foamed metal, but of course, the positive electrode active material may also be provided. As an example, a lithium source material, potassium metal or sodium metal may also be filled or / and deposited in the foamed metal, and the lithium source material is lithium metal and / or a lithium-rich material.

[0046] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0047] As an example, the negative electrode current collector may be a metal foil, a foamed metal or a composite current collector. For example, as the metal foil, aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc., treated with silver surface, may be used. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, an alloy foam, etc. The composite current collector may include a polymer material base and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0048] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0049] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is disposed on either or both of the two facing surfaces of the negative electrode current collector.

[0050] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0051] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0052] In some embodiments, the separator is a separator membrane, which can be any known porous separator membrane with good chemical stability and mechanical stability.

[0053] As an example, the material of the separator may include at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film. When the separator is a multi-layer composite film, the materials of each layer may be the same or different. The separator may be a separate component located between the positive and negative electrodes, or may be attached to the surface of the positive and negative electrodes.

[0054] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0055] In some embodiments, the battery cell further includes an electrolyte, which plays a role in conducting ions between the positive and negative electrodes. The electrolyte can be liquid, gel or solid. Among them, the liquid electrolyte includes an electrolyte salt and a solvent.

[0056] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonyl imide, lithium bistrifluoromethanesulfonyl imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium dioxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0057] In some embodiments, the solvent may include 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 may also be an ether solvent. The ether solvent may 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.

[0058] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0059] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0060] 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.

[0061] As an example, the inorganic solid electrolyte may include 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.

[0062] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0063] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0064] In some embodiments, the electrode assembly is a laminate structure.

[0065] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets may be provided respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets may be alternately stacked.

[0066] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0067] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded sections that are stacked.

[0068] As an example, a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0069] As an example, the separator may be disposed continuously, and may be disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0070] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0071] In some embodiments, the electrode assembly is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0079] In battery technology, a battery cell may include an electrode lead-out portion, an electrode assembly, and a current collecting member, and the current collecting member is used to electrically connect the electrode lead-out portion and the electrode assembly. In a battery cell, the current collecting member may include a plurality of folding portions arranged continuously, and the plurality of folding portions are folded and arranged between the electrode lead-out portion and the electrode assembly. During the use of the battery cell, the electrode assembly is prone to move inside the battery cell, thereby stretching the current collecting member connecting the electrode lead-out portion and the electrode assembly. Stretching the current collecting member is prone to cause the connection between two adjacent folding portions of the current collecting member to break, thereby affecting the service life of the battery cell.

[0080] In view of this, in order to improve the service life of a battery cell. The embodiment of the present application provides a battery cell, comprising an electrode assembly, an electrode lead-out portion, a current collecting member and a stopper, wherein the current collecting member electrically connects the electrode assembly and the electrode lead-out portion, the current collecting member is folded and arranged between the electrode assembly and the electrode lead-out portion, and the current collecting member comprises a first folding portion and a second folding portion arranged adjacently; the stopper is arranged on the current collecting member, and the stopper is configured to limit the first folding portion from flipping relative to the second folding portion in a direction away from the second folding portion.

[0081] By limiting the first folding part from flipping relative to the second folding part in a direction away from the second folding part by a limiter, the risk of the first folding part and the second folding part being broken at the connection between the first folding part and the second folding part due to flipping can be reduced, thereby maintaining the electrical connection between the electrode lead-out part and the electrode assembly and improving the service life of the battery cell.

[0082] The battery cells described in the embodiments of the present application are suitable for batteries and electrical equipment using the batteries.

[0083] Electrical equipment can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys and electric tools, etc. Vehicles can be fuel vehicles, gas vehicles or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc. Spacecraft include airplanes, 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.

[0084] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0085] Please refer to Figure 1 , Figure 1 The schematic diagram of the structure of the vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 is provided with a battery 100 inside, and the battery 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000, for example, the battery 100 can be used as an operating power source of the vehicle 1000.

[0086] The vehicle 1000 may further include a controller 200 and a motor 300 , wherein the controller 200 is used to control the battery 100 to supply power to the motor 300 , for example, to meet the power requirements of starting, navigating, and driving the vehicle 1000 .

[0087] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0088] Please refer to Figure 2 , Figure 2 This is an exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 includes a case 20 and a battery cell 10 . The case 20 is used to accommodate the battery cell 10 .

[0089] Among them, the box body 20 is a component for accommodating the battery cell 10. The box body 20 provides a storage space for the battery cell 10. The box body 20 can adopt a variety of structures. In some embodiments, the box body 20 may include a first part 201 and a second part 202, and the first part 201 and the second part 202 cover each other to define a storage space for accommodating the battery cell 10. The first part 201 and the second part 202 may be in a variety of shapes, such as a cuboid, a cylinder, etc. The first part 201 may be a hollow structure with one side open, and the second part 202 may also be a hollow structure with one side open, and the open side of the second part 202 covers the open side of the first part 201, so as to form a box body 20 with a storage space. It is also possible that the first part 201 is a hollow structure with one side open, and the second part 202 is a plate-like structure, and the second part 202 covers the open side of the first part 201, so as to form a box body 20 with a storage space. The first part 201 and the second part 202 can be sealed by a sealing element, and the sealing element can be a sealing ring, a sealant, etc.

[0090] In the battery 100, there can be one or more battery cells 10. If there are more than one battery cell 10, the multiple battery cells 10 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 10 are both connected in series and in parallel. Multiple battery cells 10 can be connected in series, in parallel, or in mixed connection to form a battery 100 module, and the multiple battery 100 modules can be connected in series, in parallel, or in mixed connection to form a whole, and accommodated in the box 20. It is also possible that all battery cells 10 are directly connected in series, in parallel, or in mixed connection, and then the whole formed by all battery cells 10 is accommodated in the box 20.

[0091] In some embodiments, the battery 100 may further include a busbar, through which multiple battery cells 10 may be electrically connected to achieve series connection, parallel connection, or hybrid connection of multiple battery cells 10. The busbar may be a metal conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0092] Please refer to Figure 3 , Figure 3 An exploded view of a battery cell 10 provided in some embodiments of the present application. The battery cell 10 includes a housing 3 and an electrode assembly 4.

[0093] The housing 3 may include a shell 31 and an end cover 32 . The shell 31 has an opening 311 . The end cover 32 seals the opening 311 of the shell 31 .

[0094] The shell 31 is a component for accommodating the electrode assembly 4. The shell 31 may be a hollow structure with an opening 311 formed at one end, or a hollow structure with openings 311 formed at opposite ends. The shell 31 may be in various shapes, such as a cylindrical shape, a rectangular parallelepiped shape, etc. The shell 31 may be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0095] The end cap 32 is a component that seals the opening 311 of the shell 31 to isolate the internal environment of the battery cell 10 from the external environment. The end cap 32 and the shell 31 together define a receiving space for accommodating the electrode assembly 4, the electrolyte and other components. The end cap 32 can be connected to the shell 31 by welding or crimping to close the opening 311 of the shell 31. The shape of the end cap 32 can be adapted to the shape of the shell 31. For example, the shell 31 is a rectangular structure, and the end cap 32 is a rectangular plate-shaped structure adapted to the outer shell 3. For another example, the shell 31 is cylindrical, and the end cap 32 is a circular plate-shaped structure adapted to the shell 31. The material of the end cap 32 can also be a variety of materials, such as copper, iron, aluminum, steel, aluminum alloy, plastic, etc. The material of the end cap 32 and the shell 31 can be the same or different.

[0096] In the embodiment where the housing 31 forms an opening 311 at one end, one end cap 32 may be provided accordingly. In the embodiment where the housing 31 forms openings 311 at two opposite ends, two end caps 32 may be provided accordingly, and the two end caps 32 respectively close the two openings 311 of the housing 31, and the two end caps 32 and the housing 31 together define a receiving space.

[0097] The electrode assembly 4 includes a main body 41 and tabs 42 . Tabs 42 are disposed at both ends of the main body 41 . The tabs 42 at both ends of the main body 41 are respectively a positive tab 421 and a negative tab 422 .

[0098] The battery cell 10 may further include an electrode terminal 5, which is disposed on the housing 3 and is used to electrically connect to the tab 42 of the electrode assembly 4 to input or output the electrical energy of the battery cell 10. The electrode terminal 5 may be electrically connected to the positive tab 421 of the electrode assembly 4, or the electrode terminal 5 may be electrically connected to the negative tab 422 of the electrode assembly 4. The electrode terminal 5 may be disposed on the shell 31 of the housing 3, or on the end cover 32 of the housing 3. The electrode terminal 5 and the tab 42 may be directly connected, for example, the electrode terminal 5 and the tab 42 are welded. The electrode terminal 5 and the tab 42 may also be indirectly connected, for example, the electrode terminal 5 and the tab 42 are indirectly connected through the current collecting component 1. The current collecting component 1 may be a metal conductor, for example, copper, iron, aluminum, steel, aluminum alloy, etc.

[0099] As an example, Figure 3As shown, an opening 311 is formed at one end of the shell 31, and the end cap 32 closes the opening 311 of the shell 31. The end cap 32 is provided with an electrode terminal 5, the electrode assembly 4 is provided in the shell 31, the current collecting component 1 is electrically connected to the electrode terminal 5 and the electrode lug 42 of the electrode assembly 4, and the current collecting component 1 is located between the electrode terminal 5 and the electrode assembly 4.

[0100] Please refer to Figure 4-Figure 6 , Figure 4 An exploded view of a battery cell 10 provided in some other embodiments of the present application; Figure 5 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application;

[0101] Figure 6 A schematic diagram of the structure of a current collecting member 1 and a limiter 2 provided for some embodiments of the present application. An embodiment of the present application provides a battery 100, comprising an electrode assembly 4, an electrode lead-out portion 6, a current collecting member 1 and a limiter 2. The electrode lead-out portion 6 is used to input or output electrical energy of a battery cell 10. The current collecting member 1 electrically connects the electrode assembly 4 and the electrode lead-out portion 6, and the current collecting member 1 is folded and arranged between the electrode assembly 4 and the electrode lead-out portion 6. The current collecting member 1 includes a first folding portion 11 and a second folding portion 12, and the first folding portion 11 and the second folding portion 12 are connected to each other and arranged adjacent to each other. The limiter 2 is provided on the current collecting member 1, and the limiter 2 is configured to be able to limit the first folding portion 11 from flipping relative to the second folding portion 12 in a direction away from the second folding portion 12.

[0102] The electrode lead-out portion 6 may be a positive electrode lead-out portion electrically connected to the electrode tab 42 of the electrode assembly 4 through the current collecting member 1, or may be a negative electrode lead-out portion electrically connected to the electrode tab 42 of the electrode assembly 4 through the current collecting member 1. The battery cell 10 may include two electrode lead-out portions 6 of opposite polarities, one of the two electrode lead-out portions 6 being electrically connected to the positive electrode tab 421 of the electrode assembly 4, and the other being electrically connected to the negative electrode tab 422.

[0103] In the embodiment where the housing 31 forms an opening 311 at one end, the electrode terminal 5 may be disposed on the end cap 32, the electrode terminal 5 may serve as an electrode lead-out portion 6, and the wall portion of the housing 31 opposite to the end cap 32 may serve as another electrode lead-out portion 6. In the embodiment where the housing 31 forms openings 311 at opposite ends, the two end caps 32 respectively block the two openings 311, an electrode terminal 5 may be disposed on one of the two end caps 32, the electrode terminal 5 may serve as one electrode lead-out portion 6, and the other of the two end caps 32 may serve as another electrode lead-out portion 6.

[0104] The current collecting component 1 may be a folded structure folded between the electrode assembly 4 and the electrode lead-out portion 6. The current collecting component 1 may include multiple folded portions, which are sequentially connected. The folded portions at both ends of the current collecting component 1 may be electrically connected to the electrode assembly 4 and the electrode lead-out portion 6 respectively.

[0105] The current collecting component 1 may be formed by integrally bending a plate so as to bend the current collecting component 1 into a plurality of folding parts, and a fold is formed between two adjacent folding parts; for example, if the current collecting component 1 has three folding parts, the current collecting component 1 has two folding parts; for another example, if the current collecting component 1 has five folding parts, the current collecting component 1 has four folding parts. The current collecting component 1 may also be formed by splicing a plurality of plates, and each plate forms at least one folding part. The first folding part 11 and the second folding part 12 may be any two adjacent folding parts in the current collecting component 1. As an example, the number of plates is two, one plate is bent to form the first folding part and the second folding part, and the other plate is connected to the second folding part to form another folding part. In the embodiment where the current collecting component 1 is spliced ​​by a plurality of plates, the plurality of plates may be welded to each other.

[0106] The folding arrangement refers to an arrangement in which two adjacent folding portions are arranged at an angle.

[0107] The limiter 2 is used to limit the first folding portion 11 from flipping relative to the second folding portion 12 in a direction away from the second folding portion 12. The limiter 2 may be connected to the first folding portion 11 and the second folding portion 12 to limit the first folding portion 11 from flipping relative to the second folding portion 12 in a direction away from the second folding portion 12. The limiter 2 may also be connected to other folding portions other than the first folding portion 11 and the second folding portion 12 to limit the first folding portion 11 from flipping relative to the second folding portion 12 in a direction away from the second folding portion 12. The material of the limiter 2 may be an insulating material or a conductive material, and the insulating material may be one of styrene-butadiene rubber, butadiene rubber, silicone rubber or plastic. The conductive material may be one of copper, iron, aluminum, aluminum alloy or copper alloy. The first folding portion 11 flips relative to the second folding portion 12 in a direction away from the second folding portion 12, so that the angle between the first folding portion 11 and the second folding portion 12 increases, and the limiting member 2 limits the maximum angle a between the first folding portion 11 and the second folding portion 12, that is, when the angle between the first folding portion 11 and the second folding portion 12 reaches the maximum angle a, under the limiting action of the limiting member 2, the first folding portion 11 cannot flip relative to the second folding portion 12 so that the angle between the first folding portion 11 and the second folding portion 12 continues to increase.

[0108] In the embodiment of the present application, the electrode lead-out portion 6 and the electrode assembly 4 are electrically connected through the current collecting member 1. The first folding portion 11 is disposed adjacent to the second folding portion 12, and the stopper 2 can limit the flipping of the first folding portion 11, thereby reducing the risk of the first folding portion 11 and the second folding portion 12 being separated due to flipping, thereby maintaining the electrical connection between the electrode lead-out portion 6 and the electrode assembly 4, and improving the structural stability of the battery cell 10.

[0109] In some embodiments, the limiting member 2 connects the first folding portion 11 and the second folding portion 12 .

[0110] The limiting member 2 may be bonded to the first folding portion 11 and the second folding portion 12 respectively, so that the limiting member 2 connects the first folding portion 11 and the second folding portion 12; the limiting member 2 may be connected to the first folding portion 11 and the second folding portion 12, so that the limiting member 2 connects the first folding portion 11 and the second folding portion 12; the limiting member 2 may be clamped to the first folding portion 11 and the second folding portion 12 respectively, so that the limiting member 2 connects the first folding portion 11 and the second folding portion 12. It is understandable that, in addition to being connected through the limiting member 2, the first folding portion 11 and the second folding portion 12 also have a connection method in which the first folding portion 11 is directly connected to the second folding portion 12, and the connection method may be that the first folding portion 11 and the second folding portion 12 are formed by bending a plate, or the first folding portion 11 and the second folding portion 12 are connected by welding.

[0111] By connecting the first folding portion 11 and the second folding portion 12 through the limiter 2, the connection strength between the first folding portion 11 and the second folding portion 12 can be improved, and the first folding portion 11 can be limited from flipping relative to the second folding portion 12 in a direction away from the second folding portion 12, thereby reducing the risk of the first folding portion 11 and the second folding portion 12 being broken and separated, thereby improving the structural stability of the battery cell 10.

[0112] In some embodiments, the first folding portion 11 is provided with a first through hole 111, and the second folding portion 12 is provided with a second through hole 121. The limiting member 2 includes a rod portion 21, a first limiting portion 22, and a second limiting portion 23. The rod portion 21 is provided through the first through hole 111 and the second through hole 121. The first limiting portion 22 and the second limiting portion 23 are respectively connected to opposite ends of the rod portion 21, the first limiting portion 22 is located on a side of the first folding portion 11 away from the second folding portion 12, and the second limiting portion 23 is located on a side of the second folding portion 12 away from the first folding portion 11, and the first limiting portion 22 and the second limiting portion 23 are configured to: when the first limiting portion 22 and the second limiting portion 23 are respectively in contact with the first folding portion 11 and the second folding portion 12, the first folding portion 11 is limited from flipping in a direction away from the second folding portion 12 relative to the second folding portion 12.

[0113] The first folded portion 11 has a first surface 112 and a second surface 113 that are oppositely disposed, the first surface 112 is disposed facing the electrode assembly 4, and the first through hole 111 penetrates the first surface 112 and the second surface 113; the second folded portion 12 has a third surface 122 and a fourth surface 123 that are oppositely disposed, the third surface 122 is disposed facing the first folded portion 11, and the second through hole 121 penetrates the third surface 122 and the fourth surface 123. The extension direction of the first through hole 111 and the extension direction of the second through hole 121 may overlap, or the extension direction of the first through hole 111 and the extension direction of the second through hole 121 may intersect.

[0114] The first limiting portion 22 is located on the side of the first surface 112 away from the second surface 113, and the second limiting portion 23 is located on the side of the fourth surface 123 away from the third surface 122. The first limiting portion 22 may be fixedly connected to the first through hole 111 so that the first limiting portion 22 abuts against the first folding portion 11; or the rod portion 21 may be movably provided in the first through hole 111, and the size of the first limiting portion 22 is larger than the aperture of the first through hole 111 so as to limit the first limiting portion 22 from passing through the first through hole 111. The second limiting portion 23 may be fixedly connected to the second through hole 121 so that the second limiting portion 23 abuts against the second folding portion 12; or the rod portion 21 may be movably provided in the second through hole 121, and the size of the second limiting portion 23 is larger than the aperture of the second through hole 121 so as to limit the second limiting portion 23 from passing through the second through hole 121. The shapes of the first limiting portion 22 and the second limiting portion 23 may be spherical, rectangular, etc. The first limiting portion 22, the second limiting portion 23 and the rod portion 21 can be separately arranged, for example, the first limiting portion 22, the second limiting portion 23 and the rod portion 21 are connected by bonding; the first limiting portion 22, the second limiting portion 23 and the rod portion 21 can also be integrally formed, for example, the first limiting portion 22, the second limiting portion 23 and the rod portion 21 are integrally injection molded.

[0115] By passing the rod portion 21 through the first through hole 111 and the second through hole 121, and making the first limiting portion 22 located on the side of the first folding portion 11 away from the second folding portion 12, and the second limiting portion 23 located on the side of the second folding portion 12 away from the first folding portion 11, the first limiting portion 22 and the second limiting portion 23 can limit the first folding portion 11 from flipping relative to the second folding portion 12 in the direction away from the second folding portion 12, thereby reducing the risk of breakage and separation of the first folding portion 11 and the second folding portion 12, and improving the structural stability of the battery cell 10.

[0116] In some embodiments, the first folding portion 11 is connected to the electrode assembly 4 , the electrode assembly 4 has a central hole 43 , and the first limiting portion 22 is located in the central hole 43 .

[0117] The first folded portion 11 may be electrically connected to the pole ear 42 of the electrode assembly 4. Alternatively, a portion of the first folded portion 11 may be electrically connected to the pole ear 42 of the electrode assembly 4, and another portion may abut against the main body 41 of the electrode assembly 4. The electrode assembly 4 may be a winding structure, the electrode assembly 4 is wound in a cylindrical shape, and the center hole 43 passes through the geometric center of the electrode assembly 4 along the extension direction of the electrode assembly 4. Among them, the first limiting portion 22 may be made of insulating material.

[0118] In the above embodiment, the first stopper 22 is located in the center hole 43, which can make the position of the stopper 2 and the electrode assembly 4 relatively stable. Since the stopper 2 is connected to the current collecting member 1, the position of the current collecting member 1 and the electrode assembly 4 is relatively stable, reducing the risk of the current collecting member 1 being separated from the electrode assembly 4. When the electrode assembly 4 is a winding structure, the first stopper 22 is inserted into the center hole 43 to reduce the risk of the center hole 43 of the electrode assembly 4 collapsing, thereby improving the internal structural stability of the battery cell 10.

[0119] In some embodiments, the limiting member 2 is a thermosetting elastomer.

[0120] The limiting member 2 may be a thermosetting material made of rubber or plastic, and the materials of the first limiting portion 22 , the second limiting portion 23 and the rod portion 21 may be the same or different.

[0121] In the above embodiment, the limiting member 2 can absorb the vibration and impact between the first folding portion 11 and the second folding portion 12 , thereby reducing the risk of damage to the current collecting member 1 .

[0122] In some embodiments, please refer to Figure 7 , Figure 7 The schematic diagram of the structure of the current collecting member 1 and the stopper 2 provided in some other embodiments of the present application. The stopper 2 includes a first adhesive layer 24 bonded to the first folding portion 11 and the second folding portion 12 .

[0123] The current collecting component 1 may include only the first folded portion 11 and the second folded portion 12, and the first adhesive layer 24 may be filled between the second surface 113 of the first folded portion 11 and the third surface 122 of the second folded portion 12. The current collecting component 1 may also include other folded portions, and the adhesive layer may be filled between the other folded portions and the adjacent folded portions, or may not be filled with the adhesive layer.

[0124] By providing the first adhesive layer 24 between the first folding portion 11 and the second folding portion 12, the first adhesive layer 24 can limit the first folding portion 11 from flipping relative to the second folding portion 12 in a direction away from the second folding portion 12, thereby reducing the risk of fracture at the connection between the first folding portion 11 and the second folding portion 12, thereby maintaining the electrical connection between the electrode lead-out portion 6 and the electrode assembly 4, and improving the structural stability of the battery cell 10.

[0125] In some embodiments, the current collecting member 1 further includes a third folded portion 13 , and the second folded portion 12 connects the first folded portion 11 and the third folded portion 13 . The stopper 2 further includes a second adhesive layer 25 bonding the second folded portion 12 and the third folded portion 13 .

[0126] As an example, Figure 7 As shown, the third folding portion 13 has a fifth surface 131 facing the second folding portion 12 , a second adhesive layer 25 is filled between the fifth surface 131 and the fourth surface 123 , and a first adhesive layer 24 is filled between the second surface 113 and the third surface 122 .

[0127] In the above embodiment, the second adhesive layer 25 connects the second folding portion 12 and the third folding portion 13, thereby limiting the second folding portion from flipping relative to the third folding portion 13 in a direction away from the third folding portion 13, reducing the risk of fracture between the second folding portion 12 and the third folding portion 13, and improving the structural stability of the current collecting component 1.

[0128] In the embodiment where the limiting member 2 includes the first adhesive layer 24 , the limiting member 2 may further include a rod portion 21 , a first limiting portion 22 and a second limiting portion 23 .

[0129] In some embodiments, please refer to Figure 8 , Figure 8 The schematic diagram of the structure of the current collecting component 1 and the stopper 2 provided in some embodiments of the present application. The current collecting component 1 further includes a third folding portion 13, the second folding portion 12 connects the first folding portion 11 and the third folding portion 13, and the stopper 2 connects the first folding portion 11 and the third folding portion 13.

[0130] The limiting member 2 may have two ends, and the two ends of the limiting member 2 are respectively connected to the first folding portion 11 and the third folding portion 13 to limit the first folding portion 11 from being away from the third folding portion 13. The limiting member 2 may also have multiple connecting portions, a part of the multiple connecting portions is connected to the first folding portion 11, and another part is connected to the third folding portion 13, and the connecting portion connected to the first folding portion 11 is connected to the connecting portion connected to the third folding portion 13.

[0131] The first folding portion 11 and the third folding portion 13 are connected by the limit member 2, and the second folding portion 12 connects the first folding portion 11 and the third folding portion 13, so that the limit member 2 can limit the positions of the first folding portion 11 and the second folding portion 12, thereby reducing the risk of damage caused by the first folding portion 11 flipping relative to the second folding portion 12 in a direction away from the second folding portion 12.

[0132] In some embodiments, the limit member 2 includes a first hook portion 26 and a second hook portion 27, the first hook portion 26 is connected to the first folding portion 11, and the second hook portion 27 is connected to the third folding portion 13, and the first hook portion 26 and the second hook portion 27 are configured to limit the first folding portion 11 from flipping relative to the second folding portion 12 in a direction away from the second folding portion 12 when the first hook portion 26 and the second hook portion 27 are hooked and engaged.

[0133] There may be one or more first hooking parts 26. When there are more than one first hooking parts 26, the first hooking parts 26 may correspond to the second hooking parts 27 one by one, or multiple first hooking parts 26 may be hooked and matched with one second hooking part 27.

[0134] The first hook portion 26 has a first hook 261 at one end away from the first folding portion 11, and the second hook portion 27 has a second hook 271 at one end away from the third folding portion 13. The first hook 261 and the second hook 271 are hooked together, wherein the first hook portion 26 and the second hook portion 27 can both be a rod-shaped structure with a hook, or a sheet-shaped structure with a hook.

[0135] By hooking the first hook portion 26 and cooperating with the second hook portion 27, the first folding portion 11 and the third folding portion 13 can be restricted from moving away from each other, thereby restricting the first folding portion 11 from flipping relative to the second folding portion 12 in a direction away from the second folding portion 12, thereby improving the structural stability of the current collecting component 1.

[0136] In some embodiments, the second folding portion 12 is provided with a third through hole 124 , and at least one of the first hook portion 26 and the second hook portion 27 is passed through the third through hole 124 .

[0137] In the embodiment where the limiting member 2 includes the first hook portion 26 and the second hook portion 27 , the limiting member 2 may further include a rod portion 21 , a first limiting portion 22 and a second limiting portion 23 , and may also include a first adhesive layer 24 .

[0138] By providing the third through hole 124 , the third through hole 124 can guide the first hook portion 26 or the second hook portion 27 , which is beneficial for the hooking and matching of the first hook portion 26 and the second hook portion 27 .

[0139] In other embodiments, the first hook portion 26 and the second hook portion 27 are disposed on both sides of the second folding portion 12 , and the first folding portion 11 and the third folding portion 13 bypass the second folding portion 12 and are directly connected through the first hook portion 26 and the second hook portion 27 .

[0140] In some embodiments, the current collecting component 1 also includes a third folding portion 13, the second folding portion 12 connects the first folding portion 11 and the third folding portion 13, the first folding portion 11 and the third folding portion 13 are arranged opposite to each other, the first folding portion 11 is connected to the electrode assembly 4, and the second folding portion 12 is connected to the electrode lead-out portion 6.

[0141] The first folding portion 11 , the second folding portion 12 and the third folding portion 13 may be formed by bending a plate, or the third folding portion 13 may be connected to the second folding portion 12 by welding.

[0142] As an example, please refer to Figure 5 The second folded portion 12 connects the first folded portion 11 and the third folded portion 13, and the first folded portion 11 is disposed opposite to the third folded portion 13. The first folded portion 11 is connected to the tab 42 of the electrode assembly 4, and the third folded portion 13 is connected to the electrode terminal 5.

[0143] In some embodiments, the stopper 2 is made of insulating material, such as silicone rubber, fluororubber, chloroprene rubber or polyurethane elastomer.

[0144] In some embodiments, the battery cell 10 further includes a housing 3 and an electrode terminal 5 . The electrode assembly 4 is accommodated in the housing 3 . The electrode terminal 5 is disposed on the housing 3 . The electrode terminal 5 is an electrode lead-out portion 6 .

[0145] An embodiment of the present application provides a battery 100, comprising a battery cell 10 provided in any one of the above embodiments.

[0146] An embodiment of the present application provides an electrical device, including a battery cell 10 provided by any one of the above embodiments or a battery 100 provided by any one of the above embodiments, wherein the battery cell 10 is used to provide electrical energy to the electrical device.

[0147] Please continue to refer to Figure 4-Figure 6The embodiment of the present application provides a battery cell 10, comprising a housing 3, an electrode assembly 4, an electrode terminal 5, a current collecting member 1 and a stopper 2. The electrode assembly 4 is disposed in the housing 3. The housing 3 has an end cap, and the electrode terminal 5 is disposed on the end cap. The current collecting member 1 is located between the electrode assembly 4 and the electrode terminal 5. The current collecting member 1 comprises a first folding portion 11, a second folding portion 12 and a third folding portion 13, the second folding portion 12 connects the first folding portion 11 and the third folding portion 13, the first folding portion 11 is electrically connected to the electrode assembly 4, and the third folding portion 13 is electrically connected to the electrode terminal 5. The stopper 2 comprises a rod 21 and a first stopper 22 and a second stopper 23 connected to both ends of the rod 21. The first stopper 22 is located on the side of the first folding portion 11 away from the second folding portion 12, the second stopper 23 is located on the side of the second folding portion 12 away from the first folding portion 11, and the rod 21 is penetrated through the first folding portion 11 and the third folding portion 13. The limiting member 2 is used to limit the first folding portion 11 from turning over relative to the second folding portion 12 in a direction away from the second folding portion 12 .

[0148] The first folding portion 11 and the second folding portion 12 are connected by the limit member 2, which can limit the flipping of the first folding portion 11, reducing the risk of the first folding portion 11 and the second folding portion 12 being separated due to flipping, thereby maintaining the electrical connection between the electrode lead-out portion 6 and the electrode assembly 4, and improving the structural stability of the battery cell 10.

[0149] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0150] The above embodiments are only used to illustrate the technical solution of the present application and are not used to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that: include: Electrode assembly; An electrode lead-out portion, used for inputting or outputting electric energy of the battery cell; a current collecting member electrically connecting the electrode assembly and the electrode lead-out portion, the current collecting member being folded and disposed between the electrode assembly and the electrode lead-out portion, the current collecting member comprising a first folded portion and a second folded portion, the first folded portion and the second folded portion being connected to each other and disposed adjacently; A limiter is provided on the current collecting member, and the limiter is configured to limit the first folding portion from turning over relative to the second folding portion in a direction away from the second folding portion.

2. The battery cell according to claim 1, characterized in that: The limiting member connects the first folding portion and the second folding portion.

3. The battery cell according to claim 2, characterized in that: The first folding portion is provided with a first through hole, the second folding portion is provided with a second through hole, and the limiting member includes: A rod portion, passing through the first through hole and the second through hole; The first limiting portion and the second limiting portion are respectively connected to the opposite ends of the rod portion, the first limiting portion is located on the side of the first folding portion away from the second folding portion, and the second limiting portion is located on the side of the second folding portion away from the first folding portion, and the first limiting portion and the second limiting portion are configured to limit the first folding portion from flipping relative to the second folding portion in a direction away from the second folding portion when the first limiting portion and the second limiting portion are respectively in contact with the first folding portion and the second folding portion.

4. The battery cell according to claim 3, characterized in that: The first folding portion is connected to the electrode assembly, the electrode assembly has a central hole, and the first limiting portion is located in the central hole.

5. The battery cell according to claim 3, characterized in that: The limiting component is a thermosetting elastomer.

6. The battery cell according to claim 2, characterized in that: The limiting component includes a first adhesive layer bonded to the first folding portion and the second folding portion.

7. The battery cell according to claim 6, characterized in that: The current collecting member further includes a third folded portion, wherein the second folded portion connects the first folded portion and the third folded portion; The limiting component also includes a second adhesive layer bonding the second folding portion and the third folding portion.

8. The battery cell according to claim 1, characterized in that: The current collecting member further includes a third folded portion, the second folded portion connects the first folded portion and the third folded portion, and the stopper connects the first folded portion and the third folded portion.

9. The battery cell according to claim 8, characterized in that: The limiting member includes a first hook portion and a second hook portion, the first hook portion is connected to the first folding portion, the second hook portion is connected to the third folding portion, and the first hook portion and the second hook portion are configured to limit the first folding portion from flipping relative to the second folding portion in a direction away from the second folding portion when the first hook portion and the second hook portion are hooked and engaged.

10. The battery cell according to claim 9, characterized in that: The second folding portion is provided with a third through hole, and at least one of the first hook portion and the second hook portion is passed through the third through hole.

11. The battery cell according to claim 1, characterized in that: The current collecting member further includes a third folded portion, the second folded portion connects the first folded portion and the third folded portion, the first folded portion is arranged opposite to the third folded portion, the first folded portion is connected to the electrode assembly, and the second folded portion is connected to the electrode lead-out portion.

12. The battery cell according to any one of claims 1 to 11, characterized in that: The limiting member is made of insulating material.

13. The battery cell according to any one of claims 1 to 11, characterized in that: The battery cell further includes a housing and an electrode terminal. The electrode assembly is accommodated in the housing. The electrode terminal is disposed on the housing and is the electrode lead-out portion.

14. A battery, characterized in that: Comprising a battery cell as claimed in any one of claims 1 to 13.

15. An electrical equipment, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 13 or a battery as claimed in claim 14, wherein the battery cell is used to provide electrical energy to the electrical device.

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