Battery cell, battery device, current collecting member, and electric device

Abstract

The utility model provides a battery monomer, a battery device, a current collecting component and a power utilization device. The battery monomer comprises an electrode assembly, an electrode lead-out part and a current collecting component; the electrode assembly is provided with tabs; the current collecting component comprises a first connecting part, a fusing part and a second connecting part, the first connecting part is connected with the tab, the second connecting part is connected with the electrode leading-out part, the fusing part is connected with the first connecting part and the second connecting part, and the minimum overcurrent area of the fusing part is smaller than the minimum overcurrent area of the first connecting part and the minimum overcurrent area of the second connecting part; the thickness of at least partial area of the fusing part is greater than that of the first connecting part, so that the thickness of the fusing part is relatively large, the strength of the fusing part of the current collecting component is improved, the long-term reliability of the current collecting component is further improved, the service life of the battery monomer is prolonged, and the use reliability of the battery monomer under a severe working condition 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 device, a current collecting component, and an electrical device. Background Art

[0002] Batteries are widely used in new energy vehicles, electronic devices, and other fields. As demand for batteries grows, higher requirements are placed on battery reliability. As market demands for battery life increase, the demand for battery life is also increasing. Utility Model Content

[0003] The embodiments of the present application provide a battery cell, a battery device, a current collecting component, and an electrical device, which can increase the service life of the battery cell.

[0004] In a first aspect, an embodiment of the present application provides a battery cell comprising an electrode assembly, an electrode lead-out portion, and a current collecting member; the electrode assembly has a tab; the current collecting member comprises a first connection portion, a fuse portion, and a second connection portion, the first connection portion being connected to the tab, the second connection portion being connected to the electrode lead-out portion, the fuse portion connecting the first connection portion and the second connection portion, the minimum flow area of the fuse portion being smaller than the minimum flow area of the first connection portion and the minimum flow area of the second connection portion; wherein the thickness of at least a portion of the fuse portion is greater than the thickness of the first connection portion.

[0005] In the above technical solution, the minimum flow area of the fuse is smaller than the minimum flow area of the first connection portion and the minimum flow area of the second connection portion. This allows the fuse to melt when the current flowing through the current collecting member exceeds the flow capacity of the fuse, thereby severing the electrical connection between the tab and the electrode lead portion, reducing the risk of battery cell accidents caused by overcurrent. By setting the thickness of the fuse to be greater than the thickness of the first connection portion of the current collecting member connected to the tab, the thickness of the fuse is increased, thereby increasing the strength of the fuse of the current collecting member, thereby improving the long-term reliability of the current collecting member, extending the service life of the battery cell, and increasing the reliability of the battery cell under harsh operating conditions.

[0006] In some embodiments of the first aspect, a ratio of a thickness of at least a portion of the fuse portion to a thickness of the first connection portion is greater than 1 and less than or equal to 10.

[0007] In the above technical solution, the ratio of the thickness of at least a part of the area of the fuse part to the thickness of the first connecting part is greater than 1 and less than or equal to 10. In other words, the thickness of at least a part of the area of the fuse part is greater than the thickness of the first connecting part, and the ratio of the thickness of the area where the fuse part is thicker than the first connecting part to the thickness of the first connecting part is less than 10. When the strength of the fuse part is increased, the influence of the increase in the thickness of the fuse part on the energy density of the battery cell is reduced, so that the battery cell not only has better reliability but also has a higher energy density.

[0008] In some embodiments of the first aspect, a thickness of any region of the fuse portion is greater than a thickness of the first connecting portion.

[0009] In the above technical solution, the thickness of any area of the fuse portion is greater than the thickness of the first connecting portion, so that the fuse portion has better strength and can reduce the difficulty of processing the current collecting component.

[0010] In some embodiments of the first aspect, the fuse portion includes a first region and a second region, the thickness of the first region is greater than the thickness of the first connecting portion, and the thickness of the second region is less than or equal to the thickness of the first connecting portion.

[0011] In the above technical solution, the fuse part includes a first area and a second area. The thickness of the first area is greater than the thickness of the first connecting part, and the thickness of the second area is less than or equal to the thickness of the first connecting part, which is equivalent to the thickness of the local area of the fuse part being greater than the thickness of the first connecting part. This not only enables the fuse part to have better structural strength, but also alleviates the problem of increased weight of the current collecting component due to increased thickness of the fuse part and reduces the impact of increased thickness of the fuse part on the energy density of the battery cell, so that the battery cell not only has better reliability but also has higher energy density.

[0012] In some embodiments of the first aspect of the present application, the first connecting portion, the fuse portion, and the second connecting portion are arranged along a first direction, at least one end of the second region along a second direction is connected to the first region, and the first direction is perpendicular to the second direction.

[0013] In the above technical solution, at least one end of the second region in a direction perpendicular to the arrangement direction of the first connecting portion, the fuse portion and the second connecting portion is connected to the first region, which not only enhances the strength of the fuse portion but also simplifies the manufacture of the current collecting component.

[0014] In some embodiments of the first aspect of the present application, a gap is formed between the first connecting portion, the first region, and the second connecting portion.

[0015] In the above technical solution, the first connecting portion, the first region, and the second connecting portion are configured with notches, facilitating the formation of a fuse with a smaller minimum flow area, thereby improving the reliability of the battery cell. The notches in the first connecting portion, the first region, and the second connecting portion increase the thickness of the fuse at the notch, reducing the risk of the current collecting component tearing at the notch and improving the reliability of the current collecting component.

[0016] In some embodiments of the first aspect of the present application, two ends of the second region along the second direction are respectively connected to the first region.

[0017] In the above technical solution, both ends of the second region along the second direction are connected to the first region respectively, so that the fuse portion has better strength, thereby improving the reliability of the current collecting component and further improving the reliability of the battery cell.

[0018] In some embodiments of the first aspect of the present application, the fuse portion includes a first area, the thickness of the first area is greater than the thickness of the first connecting portion, and along the thickness direction of the fuse portion, the first area has a first surface, and the first surface is provided with reinforcing ribs.

[0019] In the above technical solution, reinforcing ribs are provided in the first region having a thickness greater than that of the first connecting portion, thereby further improving the strength of the fuse portion, thereby further improving the reliability of the current collecting component, and further improving the reliability of the battery cell.

[0020] In some embodiments of the first aspect of the present application, the reinforcing rib includes a protrusion provided on the first surface.

[0021] In the above technical solution, the reinforcing rib includes a protrusion provided on the first surface, so that the structure of the reinforcing rib is simple and the processing difficulty of the current collecting component is relatively low.

[0022] In some embodiments of the first aspect of the present application, the fuse portion includes a first region, the thickness of the first region is greater than the thickness of the first connecting portion, and along the thickness direction of the fuse portion, the first region exceeds two opposite surfaces of the first connecting portion.

[0023] In the above technical solution, along the thickness direction of the fuse part, the first region exceeds the two opposite surfaces of the first connecting part, reducing the risk of the fuse part protruding from the surface of the first connecting part causing interference between the current collecting component and other structures of the battery cell, and facilitating the connection between the first connecting part and the tab.

[0024] In some embodiments of the first aspect of the present application, the thickness of at least a portion of the fuse portion is greater than the thickness of the second connection portion.

[0025] In the above technical solution, the thickness of at least part of the area of the fuse part is greater than the thickness of the second connecting part, so that the thickness of the fuse part is larger, thereby increasing the strength of the fuse part of the current collecting component, thereby improving the long-term reliability of the current collecting component, extending the service life of the battery cell, and increasing the reliability of the battery cell under harsh working conditions.

[0026] In some embodiments of the first aspect of the present application, the fuse portion includes a first region, the thickness of the first region is greater than the thickness of the second connecting portion, and along the thickness direction of the fuse portion, the first region exceeds two opposite surfaces of the second connecting portion.

[0027] In the above technical solution, along the thickness direction of the fuse part, the first region exceeds the two opposite surfaces of the second connecting part, reducing the risk of the fuse part protruding from the surface of the second connecting part causing interference between the current collecting component and other structures of the battery cell, and facilitating the connection between the second connecting part and the electrode lead-out part.

[0028] In some embodiments of the first aspect of the present application, the current collecting component includes two first connecting parts, which are respectively arranged on two opposite sides of the second connecting part, and each first connecting part is connected to the second connecting part through one of the fuse parts.

[0029] In the above technical solution, the two first connecting portions are respectively arranged on two opposite sides of the second connecting portion, so as to facilitate the electrical connection between the current collecting component and the tab.

[0030] In a second aspect, an embodiment of the present application provides a current collecting component, comprising a first connecting portion, a second connecting portion and a fuse portion; the first connecting portion is connected to the tab of the electrode assembly of the battery cell; the second connecting portion is connected to the electrode lead-out portion of the battery cell; the fuse portion connects the first connecting portion and the second connecting portion, and the minimum flow area of the fuse portion is smaller than the minimum flow area of the first connecting portion and the minimum flow area of the second connecting portion; wherein the thickness of at least a portion of the fuse portion is greater than the thickness of the first connecting portion.

[0031] In the above technical solution, the minimum flow area of the fuse is smaller than the minimum flow area of the first connection portion and the minimum flow area of the second connection portion. This allows the fuse to melt when the current flowing through the current collecting member exceeds the flow capacity of the fuse, thereby severing the electrical connection between the tab and the electrode lead portion of the current collecting member, thereby reducing the risk of accidents caused by overcurrent in battery cells using the current collecting member. By setting the thickness of the fuse to be greater than the thickness of the first connection portion of the current collecting member connected to the tab, the thickness of the fuse is increased, thereby increasing the strength of the fuse of the current collecting member, thereby improving the long-term reliability of the current collecting member, extending the service life of the battery cells using the current collecting member, and increasing the reliability of the battery cells under harsh operating conditions.

[0032] In a third aspect, an embodiment of the present application provides a battery device, comprising the battery cell provided by any embodiment of the first aspect.

[0033] In the above technical solutions, the battery cell provided in the first embodiment has a longer service life and better reliability, so that the battery device equipped with the battery cell has a longer service life and greater reliability.

[0034] In a fourth aspect, an embodiment of the present application provides an electrical device, comprising a battery cell provided by any embodiment of the first aspect.

[0035] In the above technical solutions, the battery cell provided by the first embodiment has a long service life and good reliability, thereby improving the power consumption reliability of the electrical device powered by the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. 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 relevant drawings can be obtained based on these drawings without creative work.

[0037] Figure 1 A schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0038] Figure 2 An exploded view of a battery device provided in some embodiments of the present application;

[0039] Figure 3 An exploded view of a battery cell provided in some embodiments of the present application;

[0040] Figure 4 Schematic diagram of the structure of the current collecting component provided in some embodiments of the present application ...;

[0041] Figure 5 for Figure 4 A1-A1 cross-sectional view;

[0042] Figure 6 for Figure 4 A2-A2 sectional view;

[0043] Figure 7 Schematic diagram of the structure of the current collecting component provided in other embodiments of the present application;

[0044] Figure 8 for Figure 7 A3-A3 sectional view;

[0045] Figure 9 for Figure 7 A4-A4 cross-sectional view;

[0046] Figure 10 A structural schematic diagram of a current collecting component is provided for some further embodiments of the present application;

[0047] Figure 11 for Figure 10 A5-A5 sectional view;

[0048] Figure 12 A schematic structural diagram of a current collecting component provided in some other embodiments of the present application;

[0049] Figure 13 for Figure 12 A6-A6 cross-sectional view;

[0050] Figure 14 for Figure 13 The enlarged image of P1 in the middle;

[0051] Figure 15 A schematic structural diagram of a current collecting component provided in some further embodiments of the present application;

[0052] Figure 16 for Figure 15 A7-A7 cross-sectional view;

[0053] Figure 17 for Figure 16 Enlarged view of P2 in the middle.

[0054] Icon: 1000-vehicle; 100-battery device; 10-housing; 11-first housing; 12-second housing; 20-battery cell; 21-housing; 211-shell; 2111-opening; 212-end cover; 22-electrode assembly; 221-tab; 23-electrode terminal; 24-electrode lead-out portion; 25-current collecting member; 251-first connecting portion; 252-fuse portion; 2521-first region; 2522-second region; 2523-first surface; 2524-first part; 2525-second part; 253-second connecting portion; 2531-mounting portion; 254-reinforcement rib; 200-controller; 300-motor; X-first direction; Y-second direction; Z-thickness direction of the fuse portion; Q-notch. DETAILED DESCRIPTION

[0055] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0056] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" 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-secondary relationship.

[0057] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0058] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0059] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0060] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0061] The term "plurality" used in this application refers to two or more (including two).

[0062] 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.

[0063] 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, etc.

[0064] A battery cell typically includes an electrode assembly. This assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process, active ions (such as lithium ions) move back and forth between the positive and negative electrodes. A separator, placed between the positive and negative electrodes, reduces the risk of short circuits while allowing active ions to pass through.

[0065] In some embodiments, the positive electrode may be a positive electrode sheet, which 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.

[0066] 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 provided on either or both of the two facing surfaces of the positive electrode current collector.

[0067] 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 surface silver plating treatment, stainless steel with a surface silver plating treatment, 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 layer 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.).

[0068] 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 battery cells may also be used. These positive electrode active materials may 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 / 3Mn 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 0.05O2) and at least one of its modified compounds, etc.

[0069] In some embodiments, a positive electrode may utilize a metal foam. The metal foam may include nickel foam, copper foam, aluminum foam, alloy foam, or the like. When a metal foam is used as the positive electrode, the surface of the metal foam may or may not include a positive electrode active material. For example, a lithium source material, potassium metal, or sodium metal may be filled or / and deposited within the metal foam, where the lithium source material is lithium metal and / or a lithium-rich material.

[0070] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0071] As an example, the negative electrode current collector can be a metal foil, a metal foam, 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 can be used. The metal foam can be nickel foam, copper foam, aluminum foam, alloy foam, etc. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can 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.).

[0072] 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.

[0073] 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 provided on either or both of the two facing surfaces of the negative electrode current collector.

[0074] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells that is well 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 battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0075] 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.

[0076] In some embodiments, the separator is a separator membrane, which can be any known porous separator membrane with good chemical and mechanical stability.

[0077] As an example, the separator can be made of at least one of fiberglass, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator can be a single-layer film or a multi-layer composite film. In the case of a multi-layer composite film, the materials of each layer can be the same or different. The separator can be a separate component positioned between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0078] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transport ions and isolate the positive and negative electrodes.

[0079] In some embodiments, the battery cell further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel, or solid. Liquid electrolytes include an electrolyte salt and a solvent.

[0080] 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 bisoxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0081] In some embodiments, the solvent may include at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methylpropyl carbonate, ethylpropyl 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.

[0082] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0083] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0084] 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, or the like.

[0085] 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.

[0086] As an example, a composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0087] 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.

[0088] In some embodiments, the electrode assembly is a laminate structure.

[0089] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be provided respectively, and the multiple positive electrode sheets and the multiple negative electrode sheets can be alternately stacked.

[0090] 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.

[0091] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folded segments.

[0092] As an example, a plurality of separators may be provided, each of which is disposed between any adjacent positive electrode sheets or negative electrode sheets.

[0093] As an example, the separator may be provided continuously, and may be provided between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0094] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0095] In some embodiments, the electrode assembly is provided with tabs that can conduct current from the electrode assembly. The tabs include a positive tab and a negative tab.

[0096] In some embodiments, a 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 (e.g., polypropylene), a composite metal housing (e.g., a copper-aluminum composite housing), or an aluminum-plastic film.

[0097] 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. Prismatic battery cells include square-shell battery cells, blade-shaped battery cells, and polygonal battery cells. Polygonal battery cells are, for example, hexagonal battery cells.

[0098] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, parallel, or hybrid via a busbar.

[0099] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells 20 ; as an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module.

[0100] As an example, a battery module may be formed by bundling a plurality of battery cells by cable ties.

[0101] In some embodiments, the battery device may be a battery pack, which may include a case and one or more battery cell assemblies, wherein the battery cell assemblies are housed in the case.

[0102] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0103] As an example, the battery cell assembly may also be housed in the box by directly fixing the plurality of battery cells to the box.

[0104] As an example, the housing may include a first housing and a second housing. The first housing and the second housing engage to form an enclosed space within the housing to house the battery cell assembly. Enclosed here means covered or closed, and can be either sealed or unsealed. The first housing may be a top cover or a bottom plate.

[0105] As an example, the box body may include a top cover, a frame, and a bottom plate, wherein the top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0106] As an example, the box body can be used as a part of the chassis structure of the vehicle. For example, the top cover of the box body can become at least a part of the floor of the vehicle, or the frame of the box body can become at least a part of the crossbeam and longitudinal beam of the vehicle.

[0107] In some embodiments, the battery device refers to an energy storage device, which includes a box with a door on at least one side. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0108] Batteries, with their outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide adaptability, and low self-discharge coefficient, are a vital component of today's new energy development. The development of battery technology requires simultaneous consideration of multiple design factors, including performance parameters such as energy density, cycle life, discharge capacity, and charge / discharge rate. Furthermore, battery reliability must be considered.

[0109] In battery technology, to reduce the risk of explosion, fire, and other issues arising from battery cell current exceeding a threshold, a current collecting member can be installed on the battery cell. This current collecting member connects the battery cell's tabs and electrode leads. The current collecting member includes a fuse, with the region of the current collecting member with the smallest minimum flow area located at the fuse. When the current flowing through the current collecting member exceeds the fuse's capacity, the fuse melts, severing the electrical connection between the tabs and the electrode leads, thereby reducing the risk of explosion, fire, and other issues arising from overcurrent. Because the fuse has the smallest minimum flow area, it represents a weak point in the current collecting member's strength. Consequently, with extended use or increasing severity of the battery cell's operating environment, the fuse will gradually age, eventually cracking or even breaking. This can prevent the battery cell from achieving a long lifespan or limit its use in harsh operating conditions.

[0110] In view of this, in order to improve the service life and reliability of the battery cell, an embodiment of the present application provides a battery cell, the battery cell includes an electrode assembly, an electrode lead-out portion and a current collecting component; the electrode assembly has a pole ear; the current collecting component includes a first connection portion, a fuse portion and a second connection portion, the first connection portion is connected to the pole ear, the second connection portion is connected to the electrode lead-out portion, the fuse portion connects the first connection portion and the second connection portion, the minimum flow area of the fuse portion is smaller than the minimum flow area of the first connection portion and the minimum flow area of the second connection portion; wherein the thickness of at least part of the area of the fuse portion is greater than the thickness of the first connection portion.

[0111] The minimum flow area of the fuse is smaller than the minimum flow area of the first connection portion and the minimum flow area of the second connection portion. This allows the fuse to melt when the current flowing through the current collecting member exceeds the flow capacity of the fuse, thereby severing the electrical connection between the tab and the electrode lead portion, reducing the risk of battery cell accidents caused by overcurrent. By setting the thickness of the fuse to be greater than the thickness of the first connection portion of the current collecting member connected to the tab, the fuse is thicker, thereby increasing the strength of the fuse of the current collecting member, thereby improving the long-term reliability of the current collecting member, extending the service life of the battery cell, and increasing the reliability of the battery cell under harsh operating conditions.

[0112] The technical solutions described in the embodiments of the present application are applicable to various electrical devices that use battery cells and battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0113] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0114] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of the present application. A battery device 100 is disposed within vehicle 1000. Battery device 100 can be located at the bottom, front, or rear of vehicle 1000. Battery device 100 can be used to power vehicle 1000. For example, battery device 100 can serve as the operating power source of vehicle 1000.

[0115] The vehicle 1000 may further include a controller 200 and a motor 300 . The controller 200 is used to control the battery device 100 to supply power to the motor 300 , for example, to meet the power requirements of the vehicle 1000 during startup, navigation, and driving.

[0116] In some embodiments of the present application, the battery device 100 can not only serve as the operating power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0117] Please refer to Figure 2 , Figure 2 This is an exploded view of a battery device 100 provided in some embodiments of the present application. The battery device 100 may include a case 10 and a battery cell 20 . The case 10 is used to accommodate the battery cell 20 .

[0118] Among them, a closed space for accommodating the battery cells 20 is formed inside the box body 10. The box body 10 can adopt various structures. In some embodiments, the box body 10 may include a first box body 11 and a second box body 12, and the first box body 11 and the second box body 12 are buckled with each other. The first box body 11 and the second box body 12 can be in various shapes, such as a rectangular parallelepiped, a cylinder, etc. The first box body 11 can be a hollow structure with one side open, and the second box body 12 can also be a hollow structure with one side open. The open side of the second box body 12 is buckled with the open side of the first box body 11 to form a box body 10 with a closed space. The first box body 11 can also be a hollow structure with one side open, and the second box body 12 can be a plate-like structure. The second box body 12 is buckled with the open side of the first box body 11 to form a box body 10 with a accommodating space.

[0119] In the battery device 100, there can be one or more battery cells 20. If there are multiple battery cells 20, the multiple battery cells 20 can be connected in series, parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 20. Multiple battery cells 20 can be connected in series, parallel, or in a hybrid connection to form a battery module, which is then connected in series, parallel, or in a hybrid connection to form a single unit and housed within the housing 10. Alternatively, all battery cells 20 can be directly connected in series, parallel, or in a hybrid connection, and then the entire unit formed by all battery cells 20 is housed within the housing 10.

[0120] In some embodiments, the battery device 100 may further include a busbar (not shown) that can electrically connect the multiple battery cells 20 to achieve series, parallel, or mixed connection of the multiple battery cells 20. The busbar can be a metal conductor, such as copper, iron, aluminum, stainless steel, or an aluminum alloy.

[0121] Please refer to Figure 3 , Figure 3 This is an exploded view of a battery cell 20 provided in some embodiments of the present application. The battery cell 20 may include a housing 21 and an electrode assembly 22 , wherein the electrode assembly 22 is accommodated in the housing 21 .

[0122] In some embodiments, the housing 21 may include a shell 211 and an end cap 212, wherein the shell 211 has an opening 2111, and the end cap 212 closes the opening 2111 of the shell 211. The term "closed" here means to cover or close, and may be sealed or non-sealed.

[0123] The housing 211 is a component for accommodating the electrode assembly 22. The housing 211 can be a hollow structure with an opening 2111 formed at one end, or it can be a hollow structure with openings 2111 formed at opposite ends. The housing 211 can have various shapes, such as a cylinder or a rectangular parallelepiped. The housing 211 can be made of various materials, such as copper, iron, aluminum, steel, and aluminum alloys. The electrode assembly 22 can be partially or completely located within the housing 211.

[0124] The end cap 212 and the shell 211 together define a receiving space for accommodating the electrode assembly 22 and other components. The end cap 212 can be connected to the shell 211 by welding, crimping, etc. to close the opening 2111 of the shell 211. The shape of the end cap 212 can be adapted to the shape of the shell 211. For example, the shell 211 is a rectangular parallelepiped structure, and the end cap 212 is a rectangular plate structure adapted to the shell 211. For another example, the shell 211 is a cylindrical structure, and the end cap 212 is a circular plate structure adapted to the shell 211. The material of the end cap 212 can also be a variety of materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. The material of the end cap 212 and the shell 211 can be the same or different.

[0125] In an embodiment where the housing 211 has an opening 2111 formed at one end, one end cap 212 may be provided. In an embodiment where the housing 211 has openings 2111 formed at opposite ends, two end caps 212 may be provided. The two end caps 212 respectively close the two openings 2111 of the housing 211, and the two end caps 212 and the housing 211 together define a receiving space.

[0126] In some embodiments, the battery cell 20 may further include an electrode terminal 23, which is disposed on the outer casing 21. The electrode terminal 23 is used to electrically connect to the tab 221 of the electrode assembly 22 to input or output electrical energy from the battery cell 20. The electrode terminal 23 may be disposed on the shell 211 of the outer casing 21 or on the end cap 212 of the outer casing 21. The electrode terminal 23 and the tab 221 may be directly connected, for example, by welding the electrode terminal 23 to the tab 221. The electrode terminal 23 and the tab 221 may also be indirectly connected, for example, by indirectly connecting the electrode terminal 23 and the tab 221 through a current collecting member 25. The current collecting member 25 may be a metal conductor, such as copper, iron, aluminum, steel, or an aluminum alloy.

[0127] As an example, Figure 3As shown, an opening 2111 is formed at one end of the housing 211. There is only one end cap 212 in the housing 21, and each end cap 212 closes the opening 2111 of the housing 211. Two electrode terminals 23 are provided on the end cap 212, and the two electrode terminals 23 are respectively a positive electrode terminal and a negative electrode terminal. A positive electrode tab and a negative electrode tab are formed on the end of the electrode assembly 22 facing the end cap 212. The positive electrode terminal is electrically connected to the positive electrode tab, and the negative electrode terminal is electrically connected to the negative electrode tab.

[0128] Please refer to Figure 3 and Figure 4 , Figure 4 A schematic diagram of the structure of a current collecting member 25 provided in an embodiment of the present application. This embodiment of the present application provides a battery cell 20, comprising an electrode assembly 22, an electrode lead portion 24, and a current collecting member 25. The electrode assembly 22 has a tab 221. The current collecting member 25 comprises a first connecting portion 251, a fuse portion 252, and a second connecting portion 253. The first connecting portion 251 is connected to the tab 221, the second connecting portion 253 is connected to the electrode lead portion 24, and the fuse portion 252 connects the first connecting portion 251 and the second connecting portion 253. The minimum flow area of the fuse portion 252 is smaller than the minimum flow area of the first connecting portion 251 and the minimum flow area of the second connecting portion 253. The thickness of at least a portion of the fuse portion 252 is greater than the thickness of the first connecting portion 251.

[0129] The first connection portion 251 is connected to the electrode tab 221. The positive electrode tab 221 may be connected to the first connection portion 251, the negative electrode tab 221 may be connected to the first connection portion 251, or the positive electrode tab 221 and the negative electrode tab 221 may be connected to the first connection portion 251 of different current collecting members 25, respectively. The first connection portion 251 and the electrode tab 221 may be connected by welding, conductive adhesive, etc., to achieve electrical connection between the first connection portion 251 and the electrode tab 221.

[0130] The electrode lead portion 24 can be electrically connected to an external structure to output electrical energy from the battery cell 20 or input electrical energy to the battery cell 20. In embodiments where the battery cell 20 includes an electrode terminal 23, the electrode lead portion 24 can be the electrode terminal 23. In other embodiments, the electrode lead portion 24 can also be a wall portion of the housing 211. The second connection portion 253 and the electrode lead portion 24 can be electrically connected by welding, conductive adhesive, or the like.

[0131] The first connection portion 251 is connected to the electrode tab 221 , and the second connection portion 253 is connected to the electrode lead portion 24 , thereby achieving electrical connection between the electrode tab 221 and the electrode lead portion 24 through the current collecting member 25 .

[0132] The first connection part 251, the fuse part 252 and the second connection part 253 can be separate structures and then connected into one. For example, the first connection part 251 and the fuse part 252 are welded and connected by conductive glue, and the second connection part 253 and the fuse part 252 are welded and connected by conductive glue, etc.

[0133] The first connection portion 251, the fuse portion 252, and the second connection portion 253 can be integrally formed to form an integrally formed current collecting member 25. The first connection portion 251, the fuse portion 252, and the second connection portion 253 are integrally formed by an integral molding method. Integral molding methods include, but are not limited to, stamping, casting, and the like.

[0134] The minimum flow area of the fuse part 252 refers to the minimum cross-sectional area of the fuse part 252 for current to pass through on the flow path of the current flowing from the electrode tab 221 through the current collecting component 25 to the electrode lead-out part 24 or from the electrode lead-out part 24 through the current collecting component 25 to the electrode tab 221. That is, in the direction of current flow through the current collecting component 25, the area of the minimum cross section of the fuse part 252 perpendicular to the direction of current flow is the minimum flow area of the fuse part 252.

[0135] The minimum flow area of the first connection portion 251 refers to the minimum cross-sectional area of the first connection portion 251 for current to pass through on the flow path of the current flowing from the electrode tab 221 through the current collecting component 25 to the electrode lead-out portion 24 or from the electrode lead-out portion 24 through the current collecting component 25 to the electrode tab 221. That is, in the direction of current flow through the current collecting component 25, the area of the minimum cross-section of the first connection portion 251 perpendicular to the direction of current flow is the minimum flow area of the first connection portion 251.

[0136] The minimum flow area of the second connection portion 253 refers to the minimum cross-sectional area of the second connection portion 253 for current to pass through on the flow path of the current flowing from the electrode tab 221 through the current collecting component 25 to the electrode lead-out portion 24 or from the electrode lead-out portion 24 through the current collecting component 25 to the electrode tab 221. That is, in the direction of current flow through the current collecting component 25, the area of the minimum cross-section of the second connection portion 253 perpendicular to the direction of current flow is the minimum flow area of the second connection portion 253.

[0137] The thickness of the fuse portion 252 may be greater than the thickness of the first connection portion 251 in all regions. The thickness of the fuse portion 252 may also be greater than the thickness of the first connection portion 251 in some regions. In some embodiments, the thickness of the first connection portion 251 may refer to the maximum thickness of the first connection portion 251.

[0138] The first connecting portion 251 may be a structure of uniform thickness or a structure of non-uniform thickness.

[0139] The first connection portion 251 can have various shapes, which are not limited in this application, such as a rectangular plate structure or a circular structure.

[0140] The minimum flow area of the fuse 252 is smaller than the minimum flow area of the first connection portion 251 and the minimum flow area of the second connection portion 253. This allows the fuse 252 to melt when the current flowing through the current collecting member 25 exceeds the flow capacity of the fuse 252, thereby severing the electrical connection between the tab 221 and the electrode lead portion 24, thereby reducing the risk of accidents caused by overcurrent in the battery cell 20. By setting the thickness of the fuse 252 to be greater than the thickness of the first connection portion 251 of the current collecting member 25, which connects to the tab 221, the fuse 252 is thicker, thereby increasing the strength of the fuse 252 of the current collecting member 25, thereby improving the long-term reliability of the current collecting member 25, extending the service life of the battery cell 20, and increasing the reliability of the battery cell 20 under harsh operating conditions.

[0141] In some embodiments, a ratio of a thickness of at least a portion of the fuse portion 252 to a thickness of the first connection portion 251 is greater than 1 and less than or equal to 10.

[0142] In the embodiment where the thickness of the entire region of the fuse portion 252 is greater than the thickness of the first connecting portion 251, the ratio of the thickness of any region of the fuse portion 252 to the thickness of the first connecting portion 251 is less than or equal to 10. In the embodiment where the thickness of the entire region of the fuse portion 252 is greater than the thickness of the first connecting portion 251, the fuse portion 252 may be a structure of uniform thickness or a structure of non-uniform thickness. For example, Figure 4-Figure 6 As shown, the thickness of any region of the fuse portion 252 is greater than the thickness of the first connecting portion 251 and the fuse portion 252 is a uniform thickness structure. Figure 6 : shows that the thicknesses of the three different positions of the fuse part 252 are D11, D12 and D13, D11=D12=D13, and the thickness of the first connection part 251 is D2, D11>D2, D12>D2, D13>D2.

[0143] In the embodiment where the thickness of a portion of the fuse portion 252 is greater than the thickness of the first connection portion 251, the ratio of the thickness of the portion where the thickness of the fuse portion 252 is greater than the thickness of the first connection portion 251 to the thickness of the first connection portion 251 is less than or equal to 10. Figure 7-Figure 9 As shown, the thickness of a portion of the fuse portion 252 is greater than the thickness of the first connection portion 251. Figure 8 、 Figure 9 3 shows the thicknesses D14, D15 and D16 of the fuse portion 252 at three different positions. The thickness of the first connection portion 251 is D2, D14>D2, D15=D2, and D16>D2.

[0144] The ratio of the thickness of at least a portion of the fuse portion 252 to the thickness of the first connection portion 251 is greater than 1 and less than or equal to 10. In other words, the thickness of at least a portion of the fuse portion 252 is greater than the thickness of the first connection portion 251, and the ratio of the thickness of the region where the fuse portion 252 is thicker than the first connection portion 251 to the thickness of the first connection portion 251 is less than 10. This increases the strength of the fuse portion 252 while reducing the impact of the increased thickness of the fuse portion 252 on the energy density of the battery cell 20, so that the battery cell 20 not only has better reliability but also has a higher energy density.

[0145] Please continue to refer to Figure 4-Figure 6 , the thickness of any area of the fuse portion 252 is greater than the thickness of the first connecting portion 251 .

[0146] The fuse portion 252 may be a structure of uniform thickness, that is, the thickness of any position of the fuse portion 252 is the same and greater than the thickness of the first connecting portion 251 . Figure 4-Figure 6 FIG. 3 shows a case where the fuse portion 252 can be a structure of uniform thickness.

[0147] The fuse portion 252 may also be a non-uniform thickness structure, that is, the fuse portion 252 has at least two regions with different thicknesses.

[0148] The thickness of any region of the fuse portion 252 is greater than the thickness of the first connection portion 251 , so that the fuse portion 252 has better strength and can reduce the difficulty of processing the current collecting member 25 .

[0149] Please continue to refer to Figure 7-Figure 9 The fuse portion 252 includes a first region 2521 and a second region 2522 . The thickness of the first region 2521 is greater than the thickness of the first connection portion 251 , and the thickness of the second region 2522 is less than or equal to the thickness of the first connection portion 251 .

[0150] The first region 2521 is part of the fuse portion 252. The second region 2522 is part of the fuse portion 252. The fuse portion 252 may include one first region 2521 or multiple first regions 2521. This means that the fuse portion 252 may have one region with a thickness greater than the first connecting portion 251, or multiple regions with a thickness greater than the first connecting portion 251. The fuse portion 252 may include one second region 2522 or multiple second regions 2522. This means that the fuse portion 252 may have one region with a thickness less than or equal to the first connecting portion 251, or multiple regions with a thickness less than or equal to the first connecting portion 251. In embodiments where there are multiple first regions 2521, any two first regions 2521 may be connected by one second region 2522.

[0151] Figure 7-Figure 9, there are two first regions 2521 and one second region 2522 .

[0152] The fuse part 252 includes a first area 2521 and a second area 2522. The thickness of the first area 2521 is greater than the thickness of the first connecting part 251, and the thickness of the second area 2522 is less than or equal to the thickness of the first connecting part 251, which is equivalent to the thickness of the local area of the fuse part 252 being greater than the thickness of the first connecting part 251. This not only enables the fuse part 252 to have better structural strength, but also alleviates the problem of increased weight of the current collecting component 25 due to the increased thickness of the fuse part 252 and reduces the impact of the increased thickness of the fuse part 252 on the energy density of the battery cell 20, so that the battery cell 20 not only has better reliability but also has higher energy density.

[0153] like Figure 7-11 As shown, in some embodiments, the first connection portion 251, the fuse portion 252 and the second connection portion 253 are arranged along the first direction X, and at least one end of the second region 2522 along the second direction Y is connected to the first region 2521, and the first direction X is perpendicular to the second direction Y.

[0154] The first direction X, the second direction Y, and the thickness direction Z of the fuse portion are perpendicular to each other.

[0155] Along the second direction Y, the second region 2522 may be connected to the first region 2521 at one end or at both ends. Figure 7-Figure 9 As shown, the fuse portion 252 includes a second region 2522 and two first regions 2521, and both ends of the second region 2522 along the second direction Y are connected to the first region 2521. Figure 10 、 Figure 11 As shown, the fuse portion 252 includes a first region 2521 and a second region 2522 , and one end of the second region 2522 along the second direction Y is connected to the first region 2521 .

[0156] At least one end of the second region 2522 in a direction perpendicular to the arrangement direction of the first connection portion 251 , the fuse portion 252 and the second connection portion 253 is connected to the first region 2521 , which not only enhances the strength of the fuse portion 252 but also simplifies the manufacture of the current collecting member 25 .

[0157] like Figure 7 、 Figure 10 As shown, in some embodiments, the first connecting portion 251 , the first region 2521 , and the second connecting portion 253 form a gap Q.

[0158] The first connecting portion 251 has a first end, to which one end of the fuse 252 is connected. The second connecting portion 253 has a second end, to which the fuse 252 is connected. In some embodiments, the first connecting portion 251, the first region 2521, and the second connecting portion 253 form a gap Q such that the first end is larger than the fuse 252 along the second direction Y. The end of the first region 2521, which forms the gap Q and faces away from the second region 2522, forms the end of the fuse 252 along the second direction Y.

[0159] The first connecting portion 251, the first region 2521 and the second connecting portion 253 may form a gap Q. Figure 10 As shown, the fuse portion 252 includes a first region 2521 and a second region 2522. The first region 2521 is connected to one end of the second region 2522 along the second direction Y. The first connecting portion 251, the first region 2521, and the second connecting portion 253 form a notch Q. The other end of the second region 2522 along the second direction Y, the first connecting portion 251, and the second connecting portion 253 can form another notch Q. It can be understood that the first connecting portion 251, the second connecting portion 253, and the two ends of the fuse portion 252 along the second direction Y each form a notch Q. The two notches Q are located at the two ends of the fuse portion 252 along the second direction Y. One of the two notches Q is formed by the first connecting portion 251, the first region 2521, and the second connecting portion 253, while the other of the two notches Q is formed by the first connecting portion 251, the second region 2522, and the second connecting portion 253. Of course, in some other embodiments, the other end of the second region 2522 along the second direction Y, the first connection portion 251 and the second connection portion 253 may also be flush without forming the gap Q.

[0160] In other embodiments, the first connecting portion 251, the first region 2521 and the second connecting portion 253 may form two gaps Q. Figure 7 As shown, the fuse portion 252 includes a second region 2522 and two first regions 2521. The second region 2522 is connected to the first region 2521 at both ends along the second direction Y. The first connecting portion 251, the second connecting portion 253, and the two first regions 2521 at both ends of the second region 2522 each form a notch Q. It can be understood that the first connecting portion 251, the second connecting portion 253, and the two ends of the fuse portion 252 along the second direction Y each form a notch Q. The two notches Q are located at both ends of the fuse portion 252 along the second direction Y. One of the two notches Q is formed by the first connecting portion 251, the first region 2521, and the second connecting portion 253, while the other of the two notches Q is formed by the first connecting portion 251, the other first region 2521, and the second connecting portion 253.

[0161] The first connecting portion 251, the first region 2521, and the second connecting portion 253 form a notch Q, facilitating the formation of a fuse portion 252 with a smaller minimum flow area, thereby improving the reliability of the battery cell 20. The notch Q formed by the first connecting portion 251, the first region 2521, and the second connecting portion 253 increases the thickness of the fuse portion 252 at the notch Q, reducing the risk of the current collecting member 25 tearing at the notch Q and improving the reliability of the current collecting member 25.

[0162] like Figure 7 As shown, in some embodiments, both ends of the second region 2522 along the second direction Y are respectively connected to the first region 2521.

[0163] Figure 7 In the embodiment, the fuse portion 252 includes a second region 2522 and two first regions 2521 , and the second region 2522 is connected to the first region 2521 at both ends along the second direction Y. The first connecting portion 251 , the second connecting portion 253 and each first region 2521 form a notch Q.

[0164] In other embodiments, the first connection portion 251 , the second connection portion 253 and the first region 2521 may not be configured to form the notch Q. For example, the first connection portion 251 , the second connection portion 253 and the first region 2521 may be flush.

[0165] Both ends of the second region 2522 along the second direction Y are connected to the first region 2521 , respectively, so that the fuse portion 252 has better strength, thereby improving the reliability of the current collecting member 25 and further improving the reliability of the battery cell 20 .

[0166] Of course, in the embodiment in which the fuse part 252 is in the form of and structure, the fuse part 252 forms a gap Q along at least one end of the second direction Y, the first connecting part 251 and the second connecting part 253. For example, Figure 4 As shown, in an embodiment where the thickness of any region of the fuse portion 252 is greater than the thickness of the first connecting portion 251 , notches Q are formed at both ends of the first connecting portion 251 , the second connecting portion 253 and the fuse portion 252 along the second direction Y.

[0167] like Figure 12-14 As shown, in some embodiments, the fuse portion 252 includes a first region 2521 , the thickness of the first region 2521 is greater than the thickness of the first connecting portion 251 , and along the thickness direction Z of the fuse portion, the first region 2521 has a first surface 2523 , and the first surface 2523 is provided with a reinforcing rib 254 .

[0168] Along the thickness direction Z of the fuse portion, the first region 2521 has two opposite first surfaces 2523 . The reinforcing rib 254 may be provided on one of the first surfaces 2523 or on both first surfaces 2523 .

[0169] The reinforcing ribs 254 can further enhance the overall strength of the fuse portion 252 .

[0170] The reinforcing rib 254 is provided in the first region 2521 having a thickness greater than that of the first connecting portion 251 to further improve the strength of the fuse portion 252 , thereby further improving the reliability of the current collecting member 25 and further improving the reliability of the battery cell 20 .

[0171] In some embodiments, the reinforcing rib 254 includes a protrusion disposed on the first surface 2523 .

[0172] The protrusion protrudes from the first surface 2523. The protrusion can have various shapes, such as a long strip, a cylinder, a triangle, etc.

[0173] The number of the protrusions can be one or more. In the embodiment with multiple protrusions, the multiple protrusions can be arranged at intervals or in a crisscross pattern.

[0174] The reinforcing rib 254 includes a protrusion provided on the first surface 2523 , so that the structure of the reinforcing rib 254 is simple and the processing difficulty of the current collecting member 25 is relatively low.

[0175] like Figure 14 As shown, in some embodiments, the fuse portion 252 includes a first region 2521 , the thickness of the first region 2521 is greater than the thickness of the first connection portion 251 , and along the thickness direction Z of the fuse portion, the first region 2521 exceeds two opposite surfaces of the first connection portion 251 .

[0176] In some embodiments, the first region 2521 may be a partial region of the fuse portion 252 (eg, Figure 7 、 Figure 10 In other embodiments, the first region 2521 is the fuse portion 252 (as shown). Figure 4 、 Figure 12 As shown), it can be understood that in this embodiment, the thickness of any area of the fuse portion 252 is greater than the thickness of the first connecting portion 251.

[0177] Along the thickness direction Z of the fuse part, the first area 2521 that extends beyond one surface of the first connecting part 251 is the first part 2524, and the first area 2521 that extends beyond the other surface of the first connecting part 251 is the second part 2525. The size of the first part 2524 along the thickness direction Z of the fuse part is the same as or different from the size of the second part 2525 along the thickness direction Z of the fuse part.

[0178] Along the thickness direction Z of the fuse portion, the first region 2521 extends beyond the two opposite surfaces of the first connecting portion 251 , reducing the risk of the fuse portion 252 protruding from the surface of the first connecting portion 251 and causing interference between the current collecting component 25 and other structures of the battery cell 20 , thereby facilitating the connection between the first connecting portion 251 and the tab 221 .

[0179] Of course, if Figure 15-17 As shown, in other embodiments, along the thickness direction Z of the fuse portion, the first region 2521 exceeds one surface of the first connecting portion 251 , and the first region 2521 is flush with the other surface of the first connecting portion 251 .

[0180] In some embodiments, the thickness of at least a portion of the fuse portion 252 is greater than the thickness of the second connection portion 253 .

[0181] The thickness of the fuse portion 252 may be greater than the thickness of the second connection portion 253 in all regions. The thickness of the fuse portion 252 may also be greater than the thickness of the second connection portion 253 in some regions. In some embodiments, the thickness of the second connection portion 253 may refer to the maximum thickness of the second connection portion 253.

[0182] The second connecting portion 253 may be a structure of uniform thickness or a structure of non-uniform thickness.

[0183] The second connection portion 253 can have various shapes, which are not limited in this application, such as a rectangular plate structure or a circular structure.

[0184] The thickness of the second connection portion 253 may be the same as or different from the thickness of the first connection portion 251 .

[0185] The thickness of at least part of the area of the fuse portion 252 is also greater than the thickness of the second connecting portion 253, so that the thickness of the fuse portion 252 is larger, thereby increasing the strength of the fuse portion 252 of the current collecting component 25, thereby improving the long-term reliability of the current collecting component 25, extending the service life of the battery cell 20, and increasing the reliability of the battery cell 20 under harsh working conditions.

[0186] In some embodiments, the fuse portion 252 includes a first region 2521 , the thickness of the first region 2521 is greater than the thickness of the second connection portion 253 , and along the thickness direction Z of the fuse portion, the first region 2521 extends beyond two opposite surfaces of the second connection portion 253 .

[0187] Along the thickness direction Z of the fuse part, the part of the first area 2521 that exceeds one surface of the second connecting part 253 is the third part, and the part of the first area 2521 that exceeds the other surface of the second connecting part 253 is the fourth part. The size of the third part along the thickness direction Z of the fuse part is the same as or different from the size of the fourth part along the thickness direction Z of the fuse part.

[0188] In an embodiment where the thickness of the second connection portion 253 is the same as the thickness of the first connection portion 251 , the first portion 2524 and the third portion may be the same, and the second portion 2525 may be the same as the fourth portion.

[0189] Along the thickness direction Z of the fuse portion, the first region 2521 extends beyond the two opposite surfaces of the second connection portion 253 , reducing the risk of the fuse portion 252 protruding from the surface of the second connection portion 253 , causing interference between the current collecting member 25 and other structures of the battery cell 20 , and facilitating the connection between the second connection portion 253 and the electrode lead-out portion 24 .

[0190] In some embodiments, the second connection portion 253 is provided with a mounting portion 2531. The mounting portion 2531 protrudes from at least one surface of the second connection portion 253 in the thickness direction Z of the fuse portion to facilitate connection between the second connection portion 253 and the electrode lead portion 24. The mounting portion 2531 can be provided separately from the second connection portion 253 and then connected to it as a whole through welding, adhesive connection, etc. The mounting portion 2531 can also be integrally formed with the second connection portion 253, such as by stamping, casting, etc.

[0191] In some embodiments, the current collecting member 25 includes two first connection parts 251 , which are respectively disposed on opposite sides of the second connection part 253 . Each first connection part 251 is connected to the second connection part 253 via a fuse part 252 .

[0192] like Figure 4 、 Figure 7 、 Figure 10 、 Figure 12 As shown, the two first connection portions 251 are located on either side of the second connection portion 253 along the first direction X. The current collecting member 25 includes two fuse portions 252, each of which is connected to the second connection portion 253 via a fuse portion 252. Along the second direction Y, the first connection portion 251 can be larger than the second connection portion 253, with at least one end of the first connection portion 251 extending beyond the second connection portion 253. Along the second direction Y, the two first connection portions 251 extend beyond the same side of the second connection portion 253.

[0193] The two first connection portions 251 are respectively disposed on opposite sides of the second connection portion 253 to facilitate electrical connection between the current collecting component 25 and the tab 221 .

[0194] Of course, in other embodiments, the current collecting member 25 may also include only one first connecting portion 251 .

[0195] The embodiment of the present application also provides a current collecting component 25, which includes a first connecting part 251, a second connecting part 253 and a fuse part 252; the first connecting part 251 is connected to the pole ear 221 of the electrode assembly 22 of the battery cell 20; the second connecting part 253 is connected to the electrode lead-out part 24 of the battery cell 20; the fuse part 252 connects the first connecting part 251 and the second connecting part 253, and the minimum flow area of the fuse part 252 is smaller than the minimum flow area of the first connecting part 251 and the minimum flow area of the second connecting part 253; wherein, the thickness of at least part of the area of the fuse part 252 is greater than the thickness of the first connecting part 251.

[0196] The minimum flow area of the fuse 252 is smaller than the minimum flow area of the first connection portion 251 and the minimum flow area of the second connection portion 253. This allows the fuse 252 to melt when the current flowing through the current collecting member 25 exceeds the flow capacity of the fuse 252, thereby severing the electrical connection between the tab 221 and the electrode lead portion 24, thereby reducing the risk of accidents caused by overcurrent in the battery cell 20 using the current collecting member 25. By setting the thickness of the fuse 252 to be greater than the thickness of the first connection portion 251 of the current collecting member 25, the fuse 252 is thicker, thereby increasing the strength of the fuse 252 of the current collecting member 25, thereby improving the long-term reliability of the current collecting member 25, extending the service life of the battery cell 20 using the current collecting member 25, and increasing the reliability of the battery cell 20 under harsh operating conditions.

[0197] An embodiment of the present application further provides a battery device 100 , which includes the battery cell 20 provided in any of the above embodiments.

[0198] The battery cell 20 provided in the above embodiment has a long service life and good reliability, so that the battery device 100 including the battery cell 20 has a longer service life and better reliability.

[0199] An embodiment of the present application further provides an electrical device, which includes the battery cell 20 provided in any of the above embodiments.

[0200] The battery cell 20 provided in the above embodiment has a long service life and good reliability, thereby improving the reliability of power consumption of the electrical device powered by the battery cell 20 .

[0201] The present invention also provides a battery cell 20, comprising an electrode assembly 22, an electrode lead portion 24, and a current collecting member 25. The electrode assembly 22 includes a tab 221, the electrode lead portion 24 serving as an electrode terminal 23, and the current collecting member 25 electrically connects the tab 221 and the electrode terminal 23. The current collecting member 25 includes two first connecting portions 251, a second connecting portion 253, and two fuse portions 252. The first connecting portion 251 connects to the tab 221, and the second connecting portion 253 connects to the electrode lead portion 24. Each first connecting portion 251 is connected to the second connecting portion 253 via a fuse portion 252. The first connecting portion 251, the fuse portion 252, and the second fuse portion 252 are arranged along a first direction X. The two first connecting portions 251 are located on either side of the second connecting portion 253 along the first direction X. The thickness of the first connecting portion 251 and the thickness of the second connecting portion 253 are the same. The fuse portion 252 includes two first regions 2521 and one second region 2522. The thickness of the first regions 2521 is greater than the thickness of the first connecting portion 251 and the thickness of the second connecting portion 253. The thickness of the second region 2522 is the same as the thickness of the first connecting portion 251 and the second connecting portion 253. The two first regions 2521 are respectively connected to the two ends of the second region 2522 along the second direction Y. Each first region 2521, the first connecting portion 251, and the second connecting portion 253 form a notch Q. Along the thickness direction Z of the fuse portion, the first regions 2521 extend beyond both surfaces of the first connecting portion 251. The portions of the first regions 2521 that extend beyond both surfaces of the first connecting portion 251 in the thickness direction Z of the fuse portion are of the same size.

[0202] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0203] The above embodiments are intended only to illustrate the technical solutions of this application and are not intended to limit this application. Those skilled in the art will appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this application are intended to be within the scope of protection of this application.

Claims

1. A battery cell, characterized in that: include: An electrode assembly having a tab; Electrode lead-out portion; a current collecting member comprising a first connecting portion, a fuse portion, and a second connecting portion, wherein the first connecting portion is connected to the electrode tab, the second connecting portion is connected to the electrode lead portion, the fuse portion connects the first connecting portion and the second connecting portion, and a minimum flow area of the fuse portion is smaller than the minimum flow area of the first connecting portion and the minimum flow area of the second connecting portion; Wherein, the thickness of at least a part of the fuse portion is greater than the thickness of the first connecting portion.

2. The battery cell according to claim 1, wherein: A ratio of a thickness of at least a portion of the fuse portion to a thickness of the first connection portion is greater than 1 and less than or equal to 10.

3. The battery cell according to claim 1, wherein: The thickness of any region of the fuse portion is greater than the thickness of the first connecting portion.

4. The battery cell according to claim 1, wherein: The fuse portion includes a first region and a second region. The thickness of the first region is greater than the thickness of the first connecting portion. The thickness of the second region is less than or equal to the thickness of the first connecting portion.

5. The battery cell according to claim 4, characterized in that The first connection portion, the fuse portion, and the second connection portion are arranged along a first direction, at least one end of the second region along a second direction is connected to the first region, and the first direction is perpendicular to the second direction.

6. The battery cell according to claim 5, characterized in that The first connecting portion, the first region, and the second connecting portion form a gap.

7. The battery cell according to claim 5 or 6, characterized in that: Both ends of the second region along the second direction are respectively connected to the first region.

8. The battery cell according to any one of claims 1 to 3, characterized in that: The fuse portion includes a first region, the thickness of the first region is greater than the thickness of the first connecting portion, and along the thickness direction of the fuse portion, the first region has a first surface, and the first surface is provided with reinforcing ribs.

9. The battery cell according to claim 8, characterized in that The reinforcing rib includes a protrusion arranged on the first surface.

10. The battery cell according to any one of claims 1 to 3, characterized in that: The fuse portion includes a first region, the thickness of the first region is greater than the thickness of the first connecting portion, and along a thickness direction of the fuse portion, the first region exceeds two opposite surfaces of the first connecting portion.

11. The battery cell according to any one of claims 1 to 6, characterized in that: The thickness of at least a portion of the fuse portion is greater than the thickness of the second connection portion.

12. The battery cell according to claim 11, characterized in that The fuse portion includes a first region, a thickness of the first region is greater than a thickness of the second connecting portion, and along a thickness direction of the fuse portion, the first region extends beyond two opposite surfaces of the second connecting portion.

13. The battery cell according to any one of claims 1 to 6, characterized in that: The current collecting component includes two first connecting parts, which are respectively arranged on two opposite sides of the second connecting part, and each of the first connecting parts is connected to the second connecting part through one of the fuse parts.

14. A current collecting component, characterized in that: include: A first connecting portion connected to a tab of an electrode assembly of a battery cell; a second connecting portion connected to an electrode lead portion of the battery cell; a fuse connecting the first connection portion and the second connection portion, wherein a minimum flow area of the fuse is smaller than a minimum flow area of the first connection portion and a minimum flow area of the second connection portion; Wherein, the thickness of at least a part of the fuse portion is greater than the thickness of the first connecting portion.

15. A battery device, characterized in that: The invention comprises a battery cell according to any one of claims 1 to 14.

16. An electrical device, characterized in that: The invention comprises a battery cell according to any one of claims 1 to 14.

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