WO2024239702A1 - 电池单体、电池、用电装置、电极组件及其制造方法 - Google Patents

电池单体、电池、用电装置、电极组件及其制造方法 Download PDF

Info

Publication number
WO2024239702A1
WO2024239702A1 PCT/CN2024/073974 CN2024073974W WO2024239702A1 WO 2024239702 A1 WO2024239702 A1 WO 2024239702A1 CN 2024073974 W CN2024073974 W CN 2024073974W WO 2024239702 A1 WO2024239702 A1 WO 2024239702A1
Authority
WO
WIPO (PCT)
Prior art keywords
pole
tabs
electrode assembly
electrode
paired
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2024/073974
Other languages
English (en)
French (fr)
Inventor
赵丰刚
金海族
柴志生
谷慧
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Contemporary Amperex Technology Co Ltd
Original Assignee
Contemporary Amperex Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Contemporary Amperex Technology Co Ltd filed Critical Contemporary Amperex Technology Co Ltd
Publication of WO2024239702A1 publication Critical patent/WO2024239702A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/244—Secondary casings; Racks; Suspension devices; Carrying devices; Holders characterised by their mounting method
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/249—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for aircraft or vehicles, e.g. cars or trains
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present disclosure relates to the field of battery technology, and in particular to a battery cell, a battery, an electrical device, an electrode assembly and a manufacturing method thereof.
  • Secondary batteries especially lithium-ion batteries, have the advantages of high voltage, high specific energy, long cycle life, green and pollution-free, wide operating temperature range and low self-discharge. They are widely used in portable electronic devices and power equipment of large new energy electric vehicles, and are of great significance to solving human environmental pollution and energy crisis. With the widespread application of lithium-ion batteries, the safety of battery use has become a problem that users pay close attention to.
  • an electrode assembly comprising a plurality of pole sheets and an isolating member located between two adjacent pole sheets with opposite polarities among the plurality of pole sheets, the plurality of pole sheets and the isolating member being wound into a winding structure along a winding direction; at least one of the plurality of pole sheets comprising: a current collector substrate, a surface of the current collector substrate being provided with an active material layer; a plurality of pole ears connected to at least one side edge of the current collector substrate extending along the winding direction, the plurality of pole ears being arranged at intervals along the winding direction, and two adjacent pole ears forming a group of paired pole ears; and a connecting portion connected between the two adjacent pole ears in one or more groups of the paired pole ears.
  • the plurality of pole ears can maintain a certain degree of integrity.
  • processing such as winding, deflection correction, and tensioning
  • the pole ears are not easily bent excessively to cause bending or insertion into the active material layer, thereby reducing the risk of defective rate loss, short circuit, or thermal runaway caused thereby.
  • connection portions connecting one or more groups of paired tabs is one of a single-bridge connection portion including a single connection bridge and a multi-bridge connection portion including a plurality of connection bridges arranged at intervals along the width direction of the current collector substrate.
  • the use of a single-bridge connection is conducive to the disconnection operation of the connection, reduces the difficulty of disconnection, and allows the adjacent tabs that have been bent and smoothed to overlap in an orderly manner to form a relatively dense tab overlap structure that is conducive to welding.
  • the use of a multi-bridge connection can improve the integrity of adjacent paired tabs, thereby better resisting bending.
  • connection portions connecting one or more groups of the paired tabs include connection portions in a disconnected state.
  • the disconnected connection portion can enable adjacent tabs to overlap in an orderly manner when they are flattened or after being flattened, so as to form a relatively dense tab overlapping structure that is conducive to welding.
  • connection portions connecting one or more groups of the paired pole ears is a single-bridge type connection portion including a single connection bridge
  • the single-bridge type connection portion in a disconnected state includes a first connection segment connected to one of the paired pole ears and a second connection segment connected to the other pole ear of the paired pole ears, the first connection segment and the second connection segment are separated from each other, the first connection segment has a first break, the second connection segment has a second break, and the first break and the second break can be at least partially spliced with each other.
  • the connecting part in the connected state can keep the adjacent paired pole ears in a certain integrity to resist bending, and before or when the pole ears are smoothed, disconnecting the connecting part can improve the orderliness of the overlapping of the pole ears.
  • the first connecting section and the second connecting section after disconnection can form the first fracture and the second fracture respectively, and the first fracture and the second fracture formed by the disconnected connecting bridge can at least partially fit together.
  • connection portions connecting one or more groups of the paired pole ears is a multi-bridge connection portion including a plurality of connection bridges arranged at intervals along the width direction of the current collector substrate, and each connection bridge in the multi-bridge connection portion in a disconnected state includes a first connection segment connected to one of the paired pole ears and a second connection segment connected to the other pole ear in the paired pole ears, the first connection segment and the second connection segment are separated from each other, the first connection segment has a first break, the second connection segment has a second break, and the first break and the second break can be at least partially spliced with each other.
  • the connecting parts in a connected state are used to keep the adjacent pairs of pole ears in a certain integrity to resist bending, and before or when the pole ears are smoothed, disconnecting the connecting parts can improve the orderliness of the overlapping of the pole ears.
  • the first connecting section and the second connecting section after each connecting bridge is disconnected can form a first break and a second break respectively, and the first break and the second break formed by the disconnected connecting bridges can at least partially fit together.
  • connection portions connecting one or more groups of the paired tabs include connection portions in a connected state.
  • the number of the connection parts in the connected state is defined as n1
  • the number of all the connection parts connecting one or more groups of the paired tabs is defined as n0
  • n1/n0 satisfies: n1/n0 ⁇ 1/2.
  • the smoothed tabs can be overlapped in an orderly manner, thereby improving the welding quality.
  • n1/n0 satisfies: n1/n0 ⁇ 1/4.
  • the orderly overlapping effect of the smoothed tabs can be further improved, and the welding quality can be effectively improved.
  • connection portions connecting one or more groups of paired tabs the number of the connection portions in a connected state that are continuously adjacent in the winding direction is defined as nc, and nc satisfies: nc ⁇ 4.
  • the uniformity of the tab overlap can be improved and the welding quality can be enhanced by making the number of continuous adjacent connections in a connected state less than or equal to 4.
  • nc satisfies: nc ⁇ 2.
  • the uniformity of the tab overlap can be further improved, and the welding quality can be effectively improved.
  • R i satisfies: R i ⁇ 30°.
  • connection portions connecting one or more groups of paired electrode tabs are connection portions in a disconnected state.
  • each group of adjacent pole ears can be flattened or overlapped in a more orderly manner after being flattened, so as to form a dense pole ear overlapping structure that is conducive to welding.
  • each of the plurality of pole lugs in the winding direction, one side or both sides of each of the plurality of pole lugs are connected to adjacent pole lugs via a connecting portion.
  • the plurality of pole tabs include a plurality of pole tab groups arranged along the winding direction, each pole tab group includes a plurality of pole tabs that are continuously adjacent and connected by the connecting portions, adjacent pole tab groups are not connected by the connecting portions, and each pole tab group includes an equal number of connecting portions.
  • the plurality of pole lugs include a plurality of pole lug groups arranged along the winding direction, each pole lug group includes a plurality of pole lugs that are continuously adjacent and connected by the connecting portion, adjacent pole lug groups are not connected by the connecting portion, and at least two of the plurality of pole lug groups include unequal numbers of connecting portions.
  • connection parts included in each tab group can be designed according to multiple factors such as the size, shape and working environment of the electrode assembly to meet more needs and improve the adaptability of the electrode assembly.
  • the number of connection portions included in each tab group increases from the winding start end of the current collector substrate to the winding end end of the current collector substrate.
  • the curvature of the electrode sheet winding circle closer to the winding starting end of the wound electrode assembly is greater, the degree of overlap of adjacent pole ears is higher, and the unbroken connection is more likely to cause the pole ear wrinkles at this position, while the curvature of the electrode sheet winding circle close to the winding ending end is smaller, the degree of overlap of adjacent pole ears is reduced, and the unbroken connection is relatively less likely to cause the pole ear wrinkles at this position.
  • connection parts included in each pole ear group from the winding starting end of the collector substrate to the winding ending end of the collector substrate, the probability of the occurrence of pole ear wrinkles near the winding starting end can be reduced by fewer connection parts, and the pole ear near the winding ending end can be connected through more connection parts.
  • the joints are used to obtain higher integrity between the tabs.
  • the connecting portion is located on a side of the root of the pair of electrode tabs away from the current collector substrate, and a hollow area penetrating along the thickness direction of the current collector substrate is included between the connecting portion and the root of the pair of electrode tabs.
  • the connecting portion can enclose a hollow area with the adjacent pole ears and the pole ear roots.
  • This structure can form stress concentration at the position of the connecting portion, which is conducive to the disconnection of the connecting portion, and further helps to increase the number of connecting portions in the disconnected state.
  • the connecting portion is located between the root and the top of the pair of electrode tabs, and the connecting portion is recessed relative to the top of the pair of electrode tabs toward the root of the pair of electrode tabs.
  • connection portion By making the connection portion concave relative to the top of the paired pole lugs toward the base of the pole lugs, the connection portion can be made easier to disconnect, which helps to increase the number of connection portions in a disconnected state.
  • connection portion with the broken edge can form a breakable portion where stress is concentrated, so that the connection portion is easier to break, which helps to increase the number of the connection portions in the broken state.
  • any one of the pair of electrode tabs connected by the connecting portion has a reinforcement structure.
  • the reinforcement structure includes a reinforcement rib disposed on the surface of the electrode tab and extending along the width direction of the current collector substrate.
  • the strength of the pole tab can be effectively improved, the risk of the pole tab breakage can be reduced, and the ease of breaking of the connection portion can be improved.
  • the connecting portion can be disconnected under tension by applying a tensile force to the tab portion during disconnection of the connecting portion. This saves time for cutting each connection separately and improves processing efficiency.
  • the battery cell using the aforementioned electrode assembly can effectively improve the safety of use.
  • the shell includes a shell and an end cover, one end of the shell has an opening, the end cover covers the opening, the shell includes a side wall and a bottom wall, the side wall surrounds the outside of the electrode assembly, the bottom wall is arranged opposite to the opening, and the wall portion of the shell is the end cover or the bottom wall.
  • the conductive member is electrically connected to the electrode terminal arranged on the end cover or the bottom wall of the shell, and is welded to the tab stacking structure of the electrode assembly, which improves the welding quality of the welding area, reduces the short circuit risk of the battery cell, and improves the safety of use.
  • a battery comprising: the aforementioned battery cell.
  • the battery using the above-mentioned battery monomer can effectively improve the safety of use.
  • an electrical device comprising: the aforementioned battery.
  • the electrical device using the above-mentioned battery can effectively improve the safety of use.
  • a method for manufacturing an electrode assembly comprising:
  • a plurality of pole pieces and separators are provided, wherein at least one of the plurality of pole pieces comprises: a current collector substrate, a plurality of pole tabs and a connecting portion, wherein an active material layer is provided on a surface of the current collector substrate, the plurality of pole tabs are connected to at least one side of the current collector substrate extending along a length direction of the current collector substrate, the plurality of pole tabs are arranged at intervals along the length direction of the current collector substrate, and two adjacent pole tabs form a group of paired pole tabs, and the connecting portion is connected between the two adjacent pole tabs in one or more groups of paired pole tabs and is in a connected state;
  • the isolating member is disposed between two adjacent pole pieces with opposite polarities among the plurality of pole pieces, and the plurality of pole pieces and the isolating member are wound into a winding structure along a winding direction;
  • a part or all of the connecting parts connecting one or more groups of paired electrode tabs are disconnected, and the plurality of electrode tabs are bent so that the plurality of electrode tabs are stacked at the end of the winding structure.
  • the pole ears By connecting one or more groups of paired pole ears that are adjacent along the winding direction among the multiple pole ears and are in a connected state, the pole ears can maintain a certain integrity to resist bending during the processing processes such as transmission, deviation correction, tensioning, and winding of the pole piece, thereby reducing the risk of bending or insertion into the active material layer caused by excessive bending.
  • the connecting part By disconnecting part or all of the connecting part and bending and smoothing the pole ears, the adjacent pole ears that have been bent and smoothed can be overlapped in an orderly manner after the connecting part is disconnected, which is conducive to forming a denser pole ear overlapping structure and improving the welding quality.
  • FIG1 is a schematic diagram of the structure of some embodiments of electric equipment according to the present disclosure.
  • FIG2 is an exploded schematic diagram of some embodiments of batteries according to the present disclosure.
  • FIG3 is a schematic diagram of connecting multiple battery cells in some embodiments of the battery disclosed herein;
  • FIG4 is an exploded schematic diagram of some embodiments of a battery cell according to the present disclosure.
  • FIG. 5 is a schematic longitudinal cross-sectional view of a battery cell according to some embodiments of the present disclosure through a winding axis CL;
  • FIG6 is an exploded schematic diagram of an electrode assembly and a conductive member in some embodiments of a battery cell according to the present disclosure
  • FIG7 is a schematic cross-sectional view of a winding structure according to some embodiments of an electrode assembly of the present disclosure
  • FIG8 is a schematic diagram of a pole piece and a pole ear in an unfolded state according to some embodiments of an electrode assembly of the present disclosure
  • FIG. 9 is a schematic diagram of a connection portion between adjacent pole tabs on a pole piece in a disconnected state and a connected state according to some embodiments of an electrode assembly of the present disclosure
  • FIG10 is a schematic diagram of the angle ranges corresponding to a plurality of consecutive adjacent groups of pole ears connected respectively by connecting portions in a connected state on each pole piece winding coil according to some embodiments of the electrode assembly of the present disclosure
  • FIG11 is a schematic diagram of a single bridge connection portion and a multi-bridge connection portion in some embodiments of an electrode assembly according to the present disclosure
  • FIG. 12A is a schematic diagram of a single bridge connection portion in a disconnected state and a connected state according to other embodiments of an electrode assembly of the present disclosure
  • FIG. 12B is a diagram of a multi-bridge in a disconnected state and a connected state according to other embodiments of the electrode assembly of the present disclosure. Schematic diagram of the connecting part;
  • 13 to 15 are schematic diagrams of connection portions of electrode pieces with different configurations in some embodiments of the electrode assembly of the present disclosure
  • FIG16 is a schematic diagram of a reinforcement structure provided on the pole ear of a pole piece in some embodiments of an electrode assembly according to the present disclosure
  • FIG17 is a schematic diagram of a connection portion provided between a plurality of adjacent pole ears of a pole piece according to some embodiments of an electrode assembly of the present disclosure
  • FIG18 is a schematic diagram of the AA section in FIG17;
  • FIG19 is a schematic diagram of a connection portion provided between a plurality of adjacent pole ears of a pole piece according to other embodiments of an electrode assembly of the present disclosure
  • FIG20 is a schematic diagram of the BB section in FIG19;
  • FIG. 21 is a schematic flow diagram of some embodiments of a method for manufacturing an electrode assembly according to the present disclosure.
  • 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.
  • the battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.
  • a battery cell generally includes an electrode assembly.
  • the electrode assembly includes a plurality of pole pieces and a separator disposed between two adjacent pole pieces.
  • the plurality of pole pieces may include a positive pole piece and a negative pole piece with opposite polarities.
  • active ions such as lithium ions
  • the separator is disposed between the positive pole piece and the negative pole piece, which can prevent the positive and negative poles from short-circuiting, while allowing active ions to pass through.
  • the positive electrode sheet may include a positive electrode current collector substrate and a positive electrode active material layer disposed on at least one surface of the positive electrode current collector substrate.
  • the positive electrode current collector substrate has two surfaces opposite to each other in its thickness direction, and the positive electrode active material The material layer is disposed on any one or both of the two opposite surfaces of the positive electrode current collector substrate.
  • the positive electrode current collector substrate may be a metal foil or a composite current collector.
  • 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 composite current collector may include a polymer material base layer and a metal layer.
  • the composite current collector may be formed by placing 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.).
  • the positive electrode active material layer may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds.
  • the present disclosure is not limited to these materials, and other traditional materials that can be used as positive electrode active material layers of batteries may also be used. These positive electrode active material layers may be used alone or in combination of two or more.
  • lithium-containing phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO 4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO 4 ), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon.
  • lithium iron phosphate such as LiFePO 4 (also referred to as LFP)
  • LiMnPO 4 lithium manganese phosphate
  • LiMnPO 4 lithium manganese phosphate
  • LiMnPO 4 lithium manganese phosphate and carbon
  • lithium transition metal oxides may include, but are not limited to, lithium cobalt oxide (such as LiCoO 2 ), lithium nickel oxide (such as LiNiO 2 ), lithium manganese oxide (such as LiMnO 2 , LiMn 2 O 4 ), 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 O 2 (also referred to as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O 2 (also referred to as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O 2 (also referred to as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O 2 (also referred to as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O 2 (also referred to as NCM 811 ), and LiNi 0.8 Co 0.2 Mn 0.2 O 2 (also referred to as NCM 811 ), and
  • the negative electrode sheet may include a negative electrode current collector substrate and a negative electrode active material layer disposed on at least one surface of the negative electrode current collector substrate.
  • the negative electrode current collector substrate can be a metal foil, a foamed metal or a composite current collector.
  • a metal foil aluminum or stainless steel treated with silver, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. can be used.
  • the foamed metal can be a foamed nickel, a foamed copper, a foamed aluminum, a foamed alloy, or a foamed carbon, etc.
  • the composite current collector may include a polymer material base and a metal layer.
  • the composite current collector may be formed by placing 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.).
  • a metal material copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.
  • a polymer material substrate such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.
  • the negative electrode current collector substrate has two surfaces opposite to each other in its thickness direction, and the negative electrode active material The material layer is disposed on any one or both of the two opposite surfaces of the negative electrode current collector substrate.
  • the negative electrode active material layer may adopt the negative electrode active material layer for battery cells known in the art.
  • the negative electrode active material layer 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.
  • the present disclosure is not limited to these materials, and other traditional materials that can be used as negative electrode active material layers for batteries may also be used. These negative electrode active material layers may be used alone or in combination of two or more.
  • the material of the positive electrode current collector substrate may be aluminum, and the material of the negative electrode current collector substrate may be copper.
  • the electrode assembly further includes a separator disposed between the positive electrode sheet and the negative electrode sheet.
  • the separator is a separator.
  • the present disclosure has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical stability and mechanical stability can be selected.
  • the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic.
  • the separator can be a single-layer film or a multi-layer composite film, without special restrictions. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without special restrictions.
  • the separator can be a separate component located between the positive electrode sheet and the negative electrode sheet, or it can be attached to the surface of the positive electrode sheet and/or the surface of the negative electrode sheet.
  • the separator is a solid electrolyte, which is disposed between the positive electrode plate and the negative electrode plate and serves to transmit ions and isolate the positive and negative electrodes.
  • the battery cell further includes an electrolyte, which plays a role of conducting ions between the positive and negative electrodes.
  • an electrolyte which plays a role of conducting ions between the positive and negative electrodes.
  • the present disclosure has no specific restrictions on the type of electrolyte, which can be selected according to needs.
  • the electrolyte can be liquid, gel or solid.
  • the liquid electrolyte includes an electrolyte salt and a solvent.
  • the electrolyte salt can be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium dioxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.
  • the solvent may be selected from ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluorocarbonic acid, At least one of ethylene ester, 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.
  • the gel electrolyte includes a polymer as the electrolyte skeleton network, combined with an ionic liquid-lithium salt.
  • the solid electrolyte includes a polymer solid electrolyte, an inorganic solid electrolyte, and a composite solid electrolyte.
  • 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.
  • the inorganic solid electrolyte can be an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.
  • 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
  • the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.
  • the electrode assembly includes a winding structure.
  • the positive electrode sheet, the negative electrode sheet and the separator are wound into a winding structure.
  • the positive electrode sheet and the negative electrode sheet can be provided with one or more respectively.
  • a plurality of positive electrode sheets and a plurality of negative electrode sheets are alternately arranged along the thickness direction of the electrode sheets.
  • the shape of the electrode assembly can be cylindrical, flat, or polygonal.
  • the electrode assembly includes a tab that can conduct current from the electrode assembly.
  • the tab may include a positive tab and a negative tab, which are connected to the positive current collector substrate and the negative current collector substrate, respectively.
  • the tab may be formed by cutting or trimming the current collector substrate, or may be connected to the side of the current collector substrate by welding.
  • 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.
  • 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, wherein the prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a multi-prismatic battery cell,
  • the polygonal prism battery is, for example, a hexagonal prism battery.
  • the battery mentioned in the embodiments of the present disclosure refers to a single physical module including one or more battery cells to provide higher voltage and capacity.
  • the battery may be a battery module.
  • the multiple battery cells are arranged and fixed to form a battery module.
  • the battery module may include multiple battery cells connected in series, in parallel, or in mixed connection.
  • 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.
  • the box body can be used as a part of the chassis structure of the vehicle.
  • 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.
  • the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.
  • the pole piece in the cylindrical battery is mainly composed of a current collector substrate and an active material layer arranged on the surface of the current collector substrate.
  • the portion of the current collector substrate that exceeds the active material layer is the converging output area. This area is cut to obtain a plurality of smaller pole ears located on the side of the current collector substrate, and a cut-out is provided between adjacent pole ears, so that each pole ear is independent of each other.
  • the pole piece When the pole piece is wound, it usually passes through functional rollers such as belt feeding, deviation correction, and tensioning. When the pole piece moves faster, the pole ear may bend outward excessively due to the centrifugal force. In addition, when the pole piece is wound around the winding needle, the pole ear may also bend excessively due to the large curvature of the winding circle. When the pole ear is excessively bent, the pole ear may fold downward when it is smoothed, and the pole ear may be inserted downward into the position of the active material layer. This will result in a loss of defective rate of the electrode assembly and even the battery cell, and the folding and downward insertion of the pole ear may cause the risk of overlapping short circuits.
  • functional rollers such as belt feeding, deviation correction, and tensioning.
  • cathode tab may block a portion of the cathode active material when it reaches the active material layer, which is not easy to detect effectively during battery quality testing. After long-term use, lithium may be deposited and overlapped around the tab corresponding to the anode pole piece, causing a short circuit risk during long-term use, and then causing thermal runaway of the battery.
  • an embodiment of the present disclosure provides an electrode assembly, comprising a plurality of pole pieces and a separator located between two adjacent pole pieces with opposite polarities among the plurality of pole pieces, wherein the plurality of pole pieces and the separator are wound into a winding structure along a winding direction.
  • At least one of the plurality of pole pieces comprises: a current collector substrate, a plurality of pole ears and a connecting portion.
  • An active material layer is provided on the surface of the current collector substrate.
  • a plurality of pole ears are connected to at least one side of the current collector substrate extending along the winding direction, and the plurality of pole ears are arranged at intervals along the winding direction, and two adjacent pole ears are arranged at intervals along the winding direction.
  • the pole lugs form a group of paired pole lugs.
  • the connecting portion is connected between the two adjacent pole lugs in one or more groups of paired pole lugs.
  • the plurality of pole ears can maintain a certain degree of integrity.
  • the pole piece is subjected to processing such as winding, deviation correction, and tensioning, the pole ears are not easily bent excessively to cause bending or insertion into the active material layer, thereby reducing the risk of short circuit or thermal runaway caused thereby, thereby improving the safety of battery use.
  • the battery cell of the embodiment of the present disclosure can be applied to various types of batteries.
  • the battery may include a box and a battery module, the box is used to provide a storage space for the battery module, and the battery module is installed in the box.
  • the box may be made of metal.
  • the battery module may include multiple battery cells connected in series, in parallel or in mixed connection.
  • the battery cell is the smallest unit that constitutes the battery.
  • the battery cell includes an electrode assembly that can undergo an electrochemical reaction.
  • the battery of the embodiment of the present disclosure can be applied to various types of electrical equipment using batteries.
  • Electrical equipment can be mobile phones, portable devices, laptops, battery cars, electric cars, ships, spacecraft, electric toys and electric tools, 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.
  • the embodiment of the present disclosure does not impose any special restrictions on the above-mentioned electrical equipment.
  • the battery can be used to power electrical equipment such as vehicles, for example, to provide power for vehicle control or power for driving.
  • FIG1 is a schematic diagram of the structure of some embodiments of the electric device according to the present disclosure.
  • the electric device is a vehicle as an example for description.
  • the vehicle 4 can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle or a hybrid vehicle, etc.
  • a battery 3 can be set at the bottom or the front or the rear of the vehicle 4.
  • the battery 3 can be used to power the vehicle 4.
  • the battery 3 can be used as the operating power source of the vehicle 4 and the circuit system of the vehicle 4, such as the working power demand during the start, navigation and operation of the vehicle 4.
  • the battery 3 can not only be used as the operating power source of the vehicle 4, but also as the driving power source of the vehicle 4, replacing or partially replacing fuel or natural gas to provide driving force for the vehicle 4.
  • the vehicle 4 may also be provided with axles, wheels, motors and controllers, and the controller is used to control the power supplied by the battery 3 to the motor.
  • the battery 3 replaces or partially replaces the fuel or natural gas to provide the motor with the power required for uniform speed and acceleration.
  • the motor is used to drive the axle to rotate, thereby driving the wheels to rotate.
  • FIG. 2 is an exploded schematic diagram of some embodiments of a battery according to the present disclosure.
  • FIG. 3 is an exploded schematic diagram of a battery according to the present disclosure. Schematic diagram of the connection of multiple battery cells in some embodiments.
  • the battery 3 includes a box body 31, a box cover 32 covering the open side of the box body 31, and one or more battery cells 2 disposed in the box body 31.
  • the box body 31 and the box cover 32 can provide a storage space for the battery cells 2, and provide cooling, sealing, and anti-collision functions, and can also prevent liquids or other foreign objects from adversely affecting the charging, discharging, or safety of the battery cells.
  • the box body 31 and the box cover 32 can be in various shapes, such as a cuboid or a cylinder.
  • the box body 31 can be a hollow structure with one side open, and the box cover 32 is a plate-like structure.
  • the box cover 32 covers the open side of the box body 31 to form an internal accommodation space.
  • the box body 31 is a hollow structure with one side open, and the box cover 32 is also a hollow structure with one side open, and the open side of the box cover 32 covers the open side of the box body 31 to form an internal accommodation space.
  • each battery cell 2 is electrically connected, such as in series, in parallel or in hybrid connection, to achieve the required electrical performance parameters of the battery 3.
  • Hybrid connection means that multiple battery cells 2 are both in series and in parallel.
  • Adjacent battery cells 2 can be electrically connected via a bus bar 26.
  • Multiple battery cells 2 are arranged in rows, and one or more rows of battery cells 2 can be arranged in the box 31 as needed.
  • the battery cells 2 of the battery 3 can be arranged along at least one of the length direction and the width direction of the box body 31. According to actual needs, at least one row or one column of battery cells 2 can be arranged. According to needs, one or more layers of battery cells 2 can also be arranged in the height direction of the battery 3.
  • multiple battery cells 2 may be connected in series, in parallel, or in a hybrid connection to form a battery module, and then multiple battery modules may be connected in series, in parallel, or in a hybrid connection to form a whole, and accommodated in the box 31.
  • all battery cells 2 are directly connected in series, in parallel, or in a hybrid connection, and then the whole formed by all battery cells 2 is accommodated in the box.
  • FIG. 4 is an exploded schematic diagram of some embodiments of a battery cell according to the present disclosure.
  • FIG. 5 is a longitudinal cross-sectional schematic diagram through a winding axis CL according to some embodiments of a battery cell according to the present disclosure.
  • FIG. 6 is an exploded schematic diagram of an electrode assembly and a conductive member according to some embodiments of a battery cell according to the present disclosure.
  • FIG. 7 is a cross-sectional schematic diagram of a winding structure in some embodiments of an electrode assembly according to the present disclosure.
  • a battery cell 2 includes an electrode assembly 1.
  • the electrode assembly 1 includes a plurality of pole sheets 11 and a separator 12 disposed between two adjacent pole sheets with opposite polarities (e.g., the positive pole sheet 11a and the negative pole sheet 11b in FIG. 7 ) among the plurality of pole sheets 11.
  • the plurality of pole sheets 11 and the separator 12 are wound along a winding direction wd to form a winding structure 10.
  • the electrode windings formed by the positive electrode sheet 10a and the negative electrode sheet 10b in the winding structure 10 are at least partially arranged alternately from the outside to the inside.
  • the separator 12 can be provided in the form of a separator on the positive electrode sheet 10a. and between the negative electrode sheet 10b.
  • the battery cell 2 further includes: a housing 21, an electrode terminal 22, and a conductive member 23.
  • the housing 21 has a chamber for accommodating the electrode assembly 1.
  • the electrode terminal 22 is disposed on a wall of the housing 21 and is electrically connected to the conductive member 23.
  • the conductive member 23 is also electrically connected to the electrode assembly 1.
  • the cavity of the shell 21 can contain electrolyte in addition to the electrode assembly 1.
  • the shape of the shell 21 can be determined according to the shape of one or more electrode assemblies 1 contained in the cavity, for example, the shape of the shell 21 is a hollow cuboid, a hollow cube or a hollow cylinder.
  • the housing 21 may include a shell 211 and an end cap 212.
  • the shell 211 is a hollow structure with an opening 211c at one or both ends, and its material may be one or more materials, such as copper, iron, aluminum, steel, aluminum alloy, plastic, etc.
  • the end cap 212 may be made of metal or non-metal material, and may be fixedly connected to the shell 211 by welding, bonding, or fastener connection.
  • the shell 211 has an opening 211c, and the end cap 212 covers the opening 211c.
  • the shell 211 may include a side wall 211a and a bottom wall 211b.
  • the side wall 211a surrounds the outer side of the electrode assembly 1, and the bottom wall 211b is arranged opposite to the opening 211c.
  • the wall portion of the shell 21 is the end cap 212 or the bottom wall 211b. Accordingly, the electrode terminal 22 may be arranged on the end cap 212 or on the bottom wall 211b.
  • the housing 211 may be a cylindrical hollow structure with an opening 211c at one end, and the end cap 212 may be a disc-shaped structure matching the opening 211c.
  • the electrode terminal 22 may be disposed on the bottom wall 211b of the housing 211 away from the end cap 212.
  • the bottom wall 211b may be provided with a through hole 211d.
  • the electrode terminal 22 may be arranged on the through hole 211d through the electrode lead-out portion 25 and the insulating member 24.
  • the electrode lead-out portion 25 may at least partially protrude from the outer surface of the bottom wall 211b to facilitate electrical connection between different battery cells 2 through the bus bar 26 (as shown in Figure 3).
  • the insulating member 24 is used to achieve insulation between the electrode lead-out portion 25 and the shell 211, and may be made of rubber or plastic.
  • openings are provided at both ends of the shell, and both are covered by end covers, and the electrode lead-out portion and the electrode terminal may be arranged on the end covers.
  • a pressure relief component 27 may be provided on the end cover 212.
  • the pressure relief component refers to an element or component that is actuated to release the internal pressure or temperature when the internal pressure or temperature of the battery cell reaches a predetermined threshold.
  • the threshold design varies according to different design requirements. The threshold may depend on one or more of the materials of the positive electrode plate, negative electrode plate, electrolyte and isolation membrane in the battery cell.
  • the pressure relief component may take the form of an explosion-proof valve, an air valve, a pressure relief valve or a safety valve, and may specifically adopt a pressure-sensitive or temperature-sensitive element or structure, that is, when the internal pressure or temperature of the battery cell reaches a predetermined threshold, the pressure relief component performs an action or a weak structure provided in the pressure relief component is Destruction, thereby forming an opening or channel for internal pressure or temperature to be released.
  • the emissions from the battery cells mentioned here include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of separators, high-temperature and high-pressure gases (such as CH 4 , CO and other combustible gases) generated by the reaction, flames, and the like.
  • electrolyte dissolved or split positive and negative electrode plates
  • fragments of separators fragments of separators
  • high-temperature and high-pressure gases such as CH 4 , CO and other combustible gases
  • the conductive member 23 may be located on both sides of the electrode assembly 1 along the extension direction of the winding axis CL of the winding structure 10. In other embodiments, the conductive member 23 may also be located on one side of the electrode assembly 1 along the extension direction of the winding axis CL of the winding structure 10.
  • the conductive members 23 on both sides of the electrode assembly 10 are respectively welded to the pole ears 112 at the ends of the electrode assembly 10 on both sides, and are respectively welded to the electrode lead-out portion 25 and the end cap 212.
  • the conductive member 23 can be used as a current collector to realize the electrical connection between the electrode assembly and the electrode terminal and the end cap and other structures.
  • the conductive member can be a metal conductor, such as copper, iron, aluminum, steel, aluminum alloy, etc.
  • the conductive member can include a current collector plate, or other structures.
  • FIG8 is a schematic diagram of a pole piece and a pole tab in an unfolded state in some embodiments of an electrode assembly according to the present disclosure.
  • at least one of the plurality of pole pieces 11 includes: a current collector substrate 111, a plurality of pole tabs 112, and a connecting portion 113.
  • An active material layer 114 is provided on the surface of the current collector substrate 111.
  • the pole piece 11 shown in FIG8 may be a positive pole piece, the current collector substrate 111 included is the positive current collector substrate mentioned above, and the active material layer 114 is the positive active material layer mentioned above.
  • the pole piece 11 may also be a negative pole piece, the current collector substrate 111 included is the negative current collector substrate mentioned above, and the active material layer 114 is the negative active material layer mentioned above.
  • a plurality of pole tabs 112 are connected to at least one side of the current collector substrate 111 extending along a winding direction wd (i.e., a length direction d1 of the flattened current collector substrate 111 ), and the plurality of pole tabs 112 are arranged at intervals along the winding direction wd, and two adjacent pole tabs 112 form a group of paired pole tabs 112 .
  • the length direction d1 of the current collector substrate 111 may be a direction from the winding start end WS to the winding end WE, or from the winding end WE to the winding start end WS.
  • the width direction d2 of the current collector substrate 111 may be perpendicular to the length direction d1 of the current collector substrate 111.
  • the connecting portion 113 is connected between two adjacent electrode tabs 112 in one or more groups of paired electrode tabs 112 .
  • a group of paired pole lugs 112 adjacent along the winding direction wd refers to two pole lugs 112 adjacent along the winding direction wd
  • multiple groups of paired pole lugs 112 adjacent along the winding direction wd refer to more than three pole lugs 112 adjacent along the winding direction wd.
  • three adjacent pole lugs 112 are two groups of paired pole lugs 112, and the middle pole lug 112 is included in both the first group of paired pole lugs and the second group of paired pole lugs.
  • the connecting portion 113 is disposed between two adjacent pole ears 112 in one or more groups of paired pole ears 112, so that the plurality of pole ears 112 can maintain a certain integrity.
  • the pole piece 11 is subjected to processing such as winding, deflection correction, and tensioning, the pole ears 112 are not easily bent excessively to cause bending or insertion into the active material layer 114, thereby reducing the risk of defective rate loss, short circuit, or thermal runaway caused thereby.
  • the height and width of the tabs are both between 3 and 10 mm, and the gap between adjacent tabs is less than 2 mm.
  • the dimensions of the tabs and the connecting portion in FIG. 8 and subsequent drawings of the specification are schematic and are not drawn according to the actual proportional relationship.
  • FIG. 9 is a schematic diagram of a connection portion between adjacent pole tabs on a pole piece in a disconnected state and a connected state according to some embodiments of an electrode assembly of the present disclosure.
  • connection parts 113 in the previous embodiments may have different states, such as a disconnected state or a connected state.
  • all the connection parts 113 connecting one or more groups of the paired tabs 112 include a connection part 113A in a disconnected state.
  • the disconnected connection portion 113 can enable the adjacent electrode tabs 112 to overlap in an orderly manner when being flattened or after being flattened, so as to form a relatively dense electrode tab overlapping structure that is conducive to welding.
  • connection portions 113 connecting one or more groups of paired tabs 112 are connection portions 113A in a disconnected state.
  • each group of adjacent pole tabs 112 can be flattened or overlapped in a more orderly manner after being flattened, so as to form a dense pole tab overlapping structure that is conducive to welding.
  • all the connecting portions 113 connecting one or more groups of paired tabs 112 further include connecting portions 113B in a connected state. That is, the connecting portions 113 connecting one or more groups of paired tabs 112 include both connecting portions 113A in a disconnected state and connecting portions 113B in a connected state. This allows a certain proportion of the connecting portions in the electrode assembly to remain in a connected state, which helps to reduce the process difficulty.
  • the connecting portion 113B in a connected state can affect the overlapping order of two or more adjacent tabs, the more connecting portions 113B in a connected state, the greater the impact on the compactness of the tab stacking structure. Therefore, the number of the connecting portions 113B in a connected state can be defined as n1, and the number of all connecting portions 113 connecting one or more groups of paired tabs 112 can be defined as n0.
  • n1/n0 satisfy: n1/n0 ⁇ 1/2, that is, making the number of connecting portions 113B in a connected state less than or equal to half of the total number of connecting portions 113, the smoothed tabs 112 can be overlapped in an orderly manner, thereby improving the welding quality.
  • n1/n0 satisfies: n1/n0 ⁇ 1/4, for example, n1/n0 is equal to 1/16, 1/8, 3/16, 1/4, etc.
  • the multiple adjacent tabs that are continuously connected by the connected portions are easily wrinkled because the connecting portions are not disconnected, thereby making the density of the overlapping areas of the tabs 112 uneven, affecting the welding quality. Therefore, among all the connecting portions 113 that connect one or more groups of paired tabs 112, the number of the connected portions 113B that are continuously adjacent in the winding direction wd can be defined as nc.
  • nc ⁇ 4 that is, the number of the plurality of consecutively adjacent connecting portions 113B in a connected state is less than or equal to 4, the overlapping uniformity of the tabs 112 can be improved, and the welding quality can be enhanced.
  • nc satisfies: nc ⁇ 2, for example, nc is equal to 1 or 2.
  • FIG. 10 is a schematic diagram of the angle ranges corresponding to a plurality of consecutive adjacent groups of pole ears connected respectively by connecting portions in a connected state on each pole piece winding coil in some embodiments of the electrode assembly disclosed herein.
  • Continuous multiple unbroken connections 113 may cause wrinkles in the smoothed pole lugs 112, resulting in uneven density of the overlapping areas of the pole lugs 112. Moreover, for the winding structure, since the diameters of the pole piece windings 110 of different layers are different, the curvatures of the corresponding pole piece windings are different. The pole piece windings that are farther away from the winding axis have a smaller overlap between adjacent pole lugs, and the resulting pole lug wrinkles are less obvious. On the contrary, the pole piece windings that are closer to the winding axis have a greater overlap between adjacent pole lugs, and the resulting pole lug wrinkles are more obvious. Therefore, the number of continuous multiple unbroken connections 113 allowed for pole piece windings of different layers may be different.
  • the pole piece winding closest to the winding axis corresponds to i 1, i.e., R 1
  • the outermost pole piece winding corresponds to i N, i.e., RN .
  • R i satisfies: R i ⁇ 30°, for example, R i can be equal to 10°, 15°, 20°, 25°, or 30°.
  • the angle range occupied by the continuous plurality of unbroken connection portions 113 corresponding to each layer of the pole piece winding coils 110 is less than or equal to 30°, which can effectively improve the overlap uniformity of the pole tabs 112 and further enhance the welding quality.
  • connection portions 113 connecting one or more groups of paired tabs 112 is a single-bridge connection portion 113s including a single connection bridge and a multi-bridge connection portion 113m including a plurality of connection bridges spaced apart along the width direction d2 of the current collector substrate 111.
  • a connection portion having only one connection bridge between two adjacent pole tabs 112 is a single-bridge connection portion 113s, and a connection portion having two or more connection bridges between two adjacent pole tabs 112, and two or more connection bridges are arranged at intervals along the width direction d2 of the current collector substrate 111, is a multi-bridge connection portion 113m.
  • all the connection bridges may be set as a single-bridge connection portion 113s, all the connection bridges may be set as a multi-bridge connection portion 113m, or a portion of all the connection bridges may be set as a single-bridge connection portion 113s, and the other portion may be set as a multi-bridge connection portion 113m.
  • the positions, widths, and spacings of the connection bridges included in each single-bridge connection portion 113s in the width direction d2 of the current collector substrate 111 may be the same or different.
  • the number, position, width, and spacing of the connection bridges included in each multi-bridge connection portion 113 in the width direction d2 of the current collector substrate 111 may be the same or different.
  • Figure 12A is a schematic diagram of a single bridge connection portion in a disconnected state and a connected state according to other embodiments of the electrode assembly of the present disclosure.
  • Figure 12B is a schematic diagram of a multi-bridge connection portion in a disconnected state and a connected state according to other embodiments of the electrode assembly of the present disclosure.
  • At least one of the connections 113 connecting one or more groups of paired tabs 112 is a single-bridge connection 113s including a single connection bridge.
  • the single-bridge connection 113s in a disconnected state is marked as 113s′
  • the single-bridge connection 113s in a connected state is marked as 113s′′.
  • the single-bridge connection portion 113s in the disconnected state includes a first connection segment 1131 connected to one of the paired pole ears 112 and a second connection segment 1132 connected to the other pole ear 112 of the paired pole ears 112, the first connection segment 1131 and the second connection segment 1132 are separated from each other, the first connection segment 1131 has a first break fr1, the second connection segment 1132 has a second break fr2, and the first break fr1 and the second break fr2 can be at least partially spliced with each other.
  • the connecting portion 113s in the connected state allows the adjacent paired pole ears 112 to maintain a certain degree of integrity to resist bending.
  • disconnecting the single bridge connecting portion 113s can improve the sound insulation of the pole ears. 112 overlap order, and a single connecting bridge is easier to disconnect.
  • the single bridge connection portion 113s can be disconnected under the action of an external force, and the disconnection of the single bridge connection portion 113s forms a first connection segment 1131 and a second connection segment 1132 separated from each other, and the disconnected position respectively forms a first break fr1 of the first connection segment 1131 and a second break fr2 of the second connection segment 1132. Since the first break fr1 and the second break fr2 are formed after being disconnected under the action of an external force, the first break fr1 and the second break fr2 can be at least partially spliced with each other.
  • the single bridge type connection portion 113 s may be disconnected in various ways, for example, by applying a tensile force or a shearing force to the connection portion 113 to pull or shear the single bridge type connection portion 113 s.
  • At least one of the connecting portions 113 connecting one or more groups of paired tabs 112 is a multi-bridge connecting portion 113m including a plurality of connecting bridges arranged at intervals along the width direction d2 of the current collector substrate 111.
  • the multi-bridge connecting portion 113m in a disconnected state is marked as 113m'
  • the multi-bridge connecting portion 113m in a connected state is marked as 113m".
  • Each connecting bridge in the multi-bridge connecting part 113m in the disconnected state includes a first connecting segment 1131 connected to one of the paired pole ears 112 and a second connecting segment 1132 connected to the other pole ear 112 of the paired pole ears 112, the first connecting segment 1131 and the second connecting segment 1132 are separated from each other, the first connecting segment 1131 has a first break fr1, the second connecting segment 1132 has a second break fr2, and the first break fr1 and the second break fr2 can be at least partially spliced with each other.
  • the adjacent paired pole ears 112 are kept in a certain integrity to resist bending by the multi-bridge connection part 113m in a connected state, and before or when the pole ears 112 are smoothed, disconnecting the multi-bridge connection part 113m can improve the orderliness of the overlapping of the pole ears.
  • the first connection section 1131 and the second connection section 1132 after each connection bridge is disconnected can form a first break fr1 and a second break fr2 respectively, and the first break fr1 and the second break fr2 formed by the disconnected connection bridge can at least partially fit together.
  • connection part in the form of multiple connection bridges
  • the adjacent pole ears can overlap in an orderly manner when they are smoothed or smoothed by disconnecting all the connection bridges, so as to better balance the resistance to the bending of the pole ears and the smoothing of the orderly overlap of the pole ears.
  • 13-15 are schematic diagrams of connection portions of electrode pieces with different configurations in some embodiments of the electrode assembly according to the present disclosure.
  • each of the plurality of tabs 112 are connected to the adjacent tabs 112 via the connecting portion 113.
  • the integrity of each tab 112 can be improved, and the possibility of excessive bending of the tab 112 before being smoothed can be reduced, thereby reducing the risk of further defective rate loss, short circuit or thermal runaway.
  • the plurality of pole tabs 112 include a plurality of pole tab groups arranged along the winding direction wd.
  • Figures 13 and 14 both illustrate three pole tab groups G1, G2 and G3, and the number of pole tab groups can be specifically determined according to factors such as the number of pole tabs, the length of the pole piece and the number of connecting portions.
  • Each pole tab group includes a plurality of pole tabs 112 that are continuously adjacent and connected by the connecting portion 113, and adjacent pole tab groups are not connected by the connecting portion 113.
  • the pole tab groups are divided according to the continuous arrangement of the connecting portion between adjacent pole tabs, and adjacent pole tab groups are not connected by the connecting portion.
  • each tab group includes an equal number of connection parts 113.
  • each tab group includes three connection parts 113. This is conducive to simplifying the processing technology of the tab 112 and reducing the processing difficulty.
  • connection portions 113 include unequal numbers of connection portions 113.
  • tab group G1 includes two connection portions 113
  • tab group G2 includes three connection portions 113
  • tab group G3 includes four connection portions 113.
  • the number of connection portions 113 included in each tab group can be designed according to factors such as the size, shape, and working environment of the electrode assembly 1 to meet more needs and improve the adaptability of the electrode assembly 1.
  • the curvature of the pole piece winding coil 110 closer to the winding starting end WS in the wound electrode assembly 1 is greater, the degree of overlap between adjacent pole ears 112 is higher, and the unbroken connection is more likely to cause pole ear wrinkles at this position, while the curvature of the pole piece winding coil 110 close to the winding ending end WE is smaller, the degree of overlap between adjacent pole ears 112 is reduced, and the unbroken connection is relatively less likely to cause pole ear wrinkles at this position.
  • the number of connecting portions 113 included in each of the tab groups G1, G2, and G3 increases from the winding start end WS of the current collector substrate 111 to the winding end WE of the current collector substrate 111. In this way, the probability of wrinkles in the tabs near the winding start end WS can be reduced by fewer connecting portions, and the tabs near the winding end WE can obtain higher integrity between the tabs through more connecting portions.
  • connection portion 113 is located at a side of the root portion 112r of the pair of tabs 112 away from the current collector substrate 111, and a hollow region CO penetrating along the thickness direction d3 of the current collector substrate 111 is included between the connection portion 113 and the root portion 112r of the pair of tabs 112.
  • the shape of the hollow region CO may be a rectangle, a trapezoid, or other polygons.
  • connection portion 113 can enclose a hollow area CO with the adjacent tab 112 and the root 112r of the tab 112. This structure can form stress concentration at the location of the connection portion 113, which is conducive to the disconnection of the connection portion 113 and further helps to increase the number of the connection portions 113A in the disconnected state.
  • connection portion 113 is located between the root 112r and the top 112t of the paired pole lugs 112, and the connection portion 113 is recessed relative to the top 112t of the paired pole lugs 112 toward the root 112r of the paired pole lugs 112.
  • the connection portion 113 can be more easily disconnected, which helps to increase the number of connection portions 113A in the disconnected state.
  • the connection portion 113 can also be flush with the top 112t of the paired pole lugs, that is, the structure shown in FIG. 13 .
  • connection portion 113 has a fold line edge 1134 on at least one side in the width direction d2 of the current collector substrate 111.
  • the connection portion 113 has a fold line edge 1134 on both sides in the width direction d2 of the current collector substrate 111.
  • the connection portion 113 has a fold line edge 1134 on one side close to the root 112r or on one side away from the root 112r in the width direction d2 of the current collector substrate 111.
  • connection portion 113 with the fold line edge 1134 can form a stress-concentrated breakable portion, thereby making the connection portion 113 easier to break, helping to increase the number of connection portions 113A in a disconnected state, so that more tabs can overlap in an orderly manner, improving the uniformity of the tab stacking structure, and further improving the welding quality.
  • FIG. 16 is a schematic diagram of a reinforcement structure provided on the pole ear of a pole piece in some embodiments of an electrode assembly according to the present disclosure.
  • any one of the paired tabs 112 connected by the connecting portion 113 has a reinforcement structure.
  • the reinforcement structure increases the strength of the tab 112, making it less likely for the tab 112 to break when the connecting portion 113 is disconnected, and correspondingly making it easier for the connecting portion 113 to be disconnected.
  • the reinforcement structure includes a reinforcing rib 112s disposed on the surface of the pole tab 112 and extending along the width direction d2 of the current collector substrate 111.
  • One reinforcing rib 112s or multiple reinforcing ribs 112s may be disposed on the surface of each pole tab 112.
  • Fig. 17 is a schematic diagram of a connection portion provided between a plurality of adjacent pole ears of a pole piece according to some embodiments of an electrode assembly of the present disclosure.
  • Fig. 18 is a schematic diagram of a cross section taken along line AA in Fig. 17 .
  • the connecting portion 113 includes a thinned region 1133, and in the thickness direction d3 of the current collector substrate 111, the thickness t1 of the thinned region 1133 is lower than that of the pair of The thickness t2 of any one of the tabs 112. Since the thinned region 1133 of the connection portion 113 is thinner than the tab 112, it is easy to disconnect, which helps to increase the number of the connection portions 113A in the disconnected state.
  • connection portion 113 can be integrally formed with the pair of tabs 112, and the connection portion 113 and the pair of tabs 112 can be formed by laser cutting the area of the current collector substrate 111 not covered by the active material layer 114.
  • the connection portion 113 can be the thinned area 1133 in its entirety or in part.
  • connection portion 113 may also be made independently of the tab 112, and accordingly may be made of the same or different material as the tab 112.
  • the connection portion 113 may be fixedly connected to the tab 112, for example, by welding or bonding.
  • Fig. 19 is a schematic diagram of a connection portion provided between a plurality of adjacent pole ears of a pole piece according to other embodiments of an electrode assembly of the present disclosure.
  • Fig. 20 is a schematic diagram of a BB section in Fig. 19 .
  • connection portion 113 made of a material different from that of the tabs is connected between adjacent paired tabs 112.
  • the tensile strength of the material of the connection portion 113 may be lower than the tensile strength of the material of any of the paired tabs 112.
  • the connection portion 113 can be disconnected by applying a tensile force to the tab 112 during the disconnection process, thereby saving the time of cutting each connection portion 113 separately and improving processing efficiency.
  • the tensile strength of a material has a well-known meaning in the art and can be measured by methods known in the art.
  • an embodiment of the present disclosure provides a battery cell 2, comprising the electrode assembly 1 of any of the embodiments described above.
  • the battery cell using the electrode assembly described above can effectively improve the safety of use.
  • the battery cell 2 further includes: a housing 21, an electrode terminal 22, and a conductive member 23.
  • the housing 21 has a chamber for accommodating the electrode assembly 1.
  • the electrode terminal 22 is disposed on a wall of the housing 21.
  • the conductive member 23 is welded to a tab stacking structure formed by stacking a plurality of tabs 112 in the electrode assembly 1 at the end of the winding structure 10, and is electrically connected to the electrode terminal 22.
  • the conductive member 23 is electrically connected to the electrode terminal 22 provided on the wall of the housing 21, and is welded to the multiple tabs 112 stacked at the end of the winding structure 10 of the electrode assembly 1.
  • the stacked multi-layer tab stacking structure has a higher thickness and is not easily penetrated when welded to the conductive member 23, so as to avoid scalding the diaphragm or The risk of short circuit caused by structures such as pole pieces is reduced, thereby improving the welding quality of the welding area, reducing the short circuit risk of the battery cell and improving safety in use.
  • the outer shell 21 includes a shell 211 and an end cover 212, one end of the shell 211 has an opening 211c, the end cover 212 covers the opening 211c, the shell 211 includes a side wall 211a and a bottom wall 211b, the side wall 211a surrounds the outside of the electrode assembly 1, and the bottom wall 211b is arranged opposite to the opening 211c, and the wall portion of the outer shell 21 is the end cover 212 or the bottom wall 211b.
  • the conductive member 23 is electrically connected to the electrode terminal 22 disposed on the end cover 212 or the bottom wall 211b of the shell 211, and is welded to the tab stacking structure of the electrode assembly 1, which improves the welding quality of the welding area, reduces the short circuit risk of the battery cell, and improves the safety of use.
  • an embodiment of the present disclosure provides a battery 3, comprising the battery cell 2 of any of the embodiments described above.
  • the battery using the battery cells described above can effectively improve the safety of use.
  • an embodiment of the present disclosure provides an electric device, comprising a battery 3 of any of the above-mentioned embodiments.
  • the electric device using the above-mentioned battery can effectively improve the safety of use.
  • FIG. 21 is a schematic flow diagram of some embodiments of a method for manufacturing an electrode assembly according to the present disclosure.
  • an embodiment of the present disclosure provides a method for manufacturing an electrode assembly 1.
  • the electrode assembly here may be the electrode assembly 1 of the above-mentioned embodiments.
  • the method for manufacturing the electrode assembly 1 includes step S10, step S20 and step S30.
  • a plurality of pole pieces 11 and separators 12 are provided. At least one of the plurality of pole pieces 11 includes: a current collector substrate 111, a plurality of pole tabs 112 and a connecting portion 113.
  • An active material layer 114 is provided on the surface of the current collector substrate 111, the plurality of pole tabs 112 are connected to at least one side of the current collector substrate 111 extending along the length direction d1 of the current collector substrate 111, the plurality of pole tabs 112 are arranged at intervals along the length direction d1 of the current collector substrate 111, and two adjacent pole tabs 112 form a group of paired pole tabs 112, and the connecting portion 113 is connected between the two adjacent pole tabs 112 in one or more groups of paired pole tabs 112, and is in a connected state.
  • step S20 the isolating member 12 is disposed between two adjacent pole pieces 11 with opposite polarities among the plurality of pole pieces 11 , and the plurality of pole pieces 11 and the isolating member 12 are wound into a winding structure 10 along a winding direction wd.
  • step S30 a part or all of the connecting portions 113 connecting one or more groups of paired tabs 112 are disconnected, and the multiple tabs 112 are bent so that the multiple tabs 112 are stacked at the end of the winding structure 10.
  • the disconnection operation of the connecting portions 113 can be performed before or when the multiple tabs 112 are bent.
  • the pole ears By connecting one or more groups of paired pole ears that are adjacent along the first direction among a plurality of pole ears and are in a connected state, the pole ears can maintain a certain integrity to resist bending during the processing processes of transmitting, correcting, tensioning, winding, etc. of the pole piece, thereby reducing the risk of bending or insertion into the active material layer caused by excessive bending.
  • the connecting part and bending and smoothing the pole ears By disconnecting part or all of the connecting part and bending and smoothing the pole ears, the adjacent pole ears that have been bent and smoothed can be overlapped in an orderly manner after the connecting part is disconnected, thereby facilitating the formation of a denser pole ear overlapping structure and improving the welding quality.
  • the battery cell 2 includes: an electrode assembly 1, a housing 21, an electrode terminal 22, and a conductive member 23.
  • the housing 21 has a chamber for accommodating the electrode assembly 1.
  • the housing 21 includes a shell 211 and an end cover 212, one end of the shell 211 has an opening 211c, the end cover 212 covers the opening 211c, the shell 211 includes a side wall 211a and a bottom wall 211b, the side wall 211a surrounds the outside of the electrode assembly 1, and the bottom wall 211b is arranged opposite to the opening 211c.
  • the electrode terminal 22 is disposed on the bottom wall 211 b of the housing 21 .
  • the conductive member 23 is welded to a tab stacking structure formed by stacking a plurality of tabs 112 in the electrode assembly 1 at the end of the winding structure 10 , and is electrically connected to the electrode terminal 22 .
  • the electrode assembly 1 includes a positive electrode sheet 11a, a negative electrode sheet 11b, and a separator 12 located between the positive electrode sheet 11a and the negative electrode sheet 11b.
  • the positive electrode sheets 11a and the negative electrode sheets 11b are arranged alternately and wound with the separator 12 to form a winding structure 10.
  • the positive electrode sheet 11a and the negative electrode sheet 11b can each include a current collector substrate 111, a plurality of tabs 112, and a connecting portion 113.
  • An active material layer 114 is provided on the surface of the current collector substrate 111.
  • a plurality of tabs 112 are connected to a side of the current collector substrate 111 extending along the winding direction wd, and are arranged at intervals along the winding direction wd. Two adjacent tabs 112 form a group of paired tabs 112. A connecting portion 113 is connected between the two adjacent tabs 112 in one or more groups of paired tabs 112.
  • All the connecting parts 113 connecting one or more groups of the paired pole lugs 112 include connecting parts 113A in a disconnected state and connecting parts 113B in a connected state. All the connecting parts 113 connecting one or more groups of the paired pole lugs 112 are single-bridge connecting parts 113s, wherein the single-bridge connecting part 113s in a disconnected state includes a first connecting section 1131 connected to one of the paired pole lugs 112 and a second connecting section 1132 connected to the other of the paired pole lugs 112, wherein the first connecting section 1131 and the second connecting section 1132 are separated from each other, wherein the first connecting section 1131 has a first break fr1, and the second connecting section 1132 has a second break fr2, and the first break fr1 and the second break fr2 can be at least partially spliced with each other.
  • each of the plurality of tabs 112 are connected to the adjacent tabs 112 via a connecting portion 113.
  • the connecting portion 113 is located at the root of the paired tabs 112. 112r and the top 112t of the paired electrode tabs 112 , and the connecting portion 113 is recessed toward the direction approaching the root 112r of the paired electrode tabs 112 relative to the top 112t of the paired electrode tabs 112 .
  • the plurality of tabs 112 include a plurality of tab groups arranged along the winding direction wd, and the number of connecting portions 113 included in each tab group increases from the winding start end WS of the current collector substrate 111 to the winding end WE of the current collector substrate 111 .

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

一种电极组件(1)，包括多个极片(11)和位于多个极片(11)中极性相反的相邻两个极片(11)之间的隔离件(12)，多个极片(11)和隔离件(12)沿卷绕方向(wd)卷绕成卷绕结构(10)；多个极片(11)中的至少一个包括：集流体基材(111)，集流体基材的表面设有活性物质层(114)；多个极耳(112)，连接在集流体基材(111)沿卷绕方向(wd)延伸的至少一个侧边上，多个极耳(112)沿卷绕方向(wd)间隔排布，并且相邻两个极耳(112)形成一组成对极耳(112)；和连接部(113)，连接在一组或多组成对极耳(112)中的相邻两个极耳(112)之间。还提供了一种电池单体、电池、用电装置和电极组件的制造方法。

Description

电池单体、电池、用电装置、电极组件及其制造方法
相关申请的交叉引用
本申请是以CN申请号为202310584283.8，申请日为2023年5月23日的申请为基础，并主张其优先权，该CN申请的公开内容在此作为整体引入本申请中。
技术领域
本公开涉及电池技术领域，特别是涉及一种电池单体、电池、用电装置、电极组件及其制造方法。
背景技术
二次电池尤其是锂离子电池具有电压高、比能量大、循环寿命长、绿色无污染、工作温度范围宽及自放电小等优点，在便携式电子设备及大型新能源电动汽车的动力设备方面得到广泛应用，对解决人类环境污染和能源危机有着重大意义。随着锂离子电池的广泛应用，电池的使用安全性成为使用者密切关注的问题。
发明内容
在本公开的一个方面，提供一种电极组件，包括多个极片和位于所述多个极片中极性相反的相邻两个极片之间的隔离件，所述多个极片和所述隔离件沿卷绕方向卷绕成卷绕结构；所述多个极片中的至少一个包括：集流体基材，所述集流体基材的表面设有活性物质层；多个极耳，连接在所述集流体基材沿所述卷绕方向延伸的至少一个侧边上，所述多个极耳沿所述卷绕方向间隔排布，并且相邻两个极耳形成一组成对极耳；和连接部，连接在一组或多组所述成对极耳中的所述相邻两个极耳之间。
通过在沿卷绕方向相邻的一组或多组成对极耳之间设置连接部，可以使多个极耳保持一定的整体性，在对极片进行卷绕、纠偏、张紧等加工处理时，使极耳不容易过度弯曲而造成弯折或插入到活性物质层，降低由此造成的不良率损失、短路或热失控风险。
在一些实施例中，连接一组或多组所述成对极耳的所有连接部中的至少一个为包括单个连接桥的单桥式连接部和包括沿所述集流体基材的宽度方向间隔排布的多个连接桥的多桥式连接部中的一种。
采用单桥式连接部有利于连接部的断开操作，降低断开难度，使被弯折抚平的相邻极耳能够有序地交叠，以形成利于焊接的比较致密的极耳交叠结构。采用多桥式连接部可以提升相邻成对极耳的整体性，从而更好地抵挡弯曲。
在一些实施例中，连接一组或多组所述成对极耳的所有连接部包括处于断开状态的连接部。
在电极组件中，断开的连接部可以使相邻极耳被抚平时或被抚平后能够有序地交叠，以形成利于焊接的比较致密的极耳交叠结构。
在一些实施例中，所述连接一组或多组所述成对极耳的所有连接部中的至少一个为包括单个连接桥的单桥式连接部，处于断开状态的单桥式连接部包括与所述成对极耳中的一个极耳连接的第一连接段和与所述成对极耳中的另一个极耳连接的第二连接段，所述第一连接段与所述第二连接段相互分离，所述第一连接段具有第一断口，所述第二连接段具有第二断口，所述第一断口与所述第二断口能够至少部分地相互拼合。
对于极片加工过程来说，当对极片进行传输、纠偏、张紧、卷绕等加工工艺时，通过处于连接状态的连接部使相邻成对极耳保持一定的整体性来抵挡弯曲，而在对极耳进行抚平之前或抚平时，断开连接部可以改善极耳交叠的有序性。当断开单桥式连接部时，能够使断开后的第一连接段和第二连接段分别形成第一断口和第二断口，这种断开连接桥所形成的第一断口和第二断口能够至少部分地相互拼合。
在一些实施例中，所述连接一组或多组所述成对极耳的所有连接部中的至少一个为包括沿所述集流体基材的宽度方向间隔排布的多个连接桥的多桥式连接部，处于断开状态的多桥式连接部中的每个连接桥均包括与所述成对极耳中的一个极耳连接的第一连接段和与所述成对极耳中的另一个极耳连接的第二连接段，所述第一连接段与所述第二连接段相互分离，所述第一连接段具有第一断口，所述第二连接段具有第二断口，所述第一断口与所述第二断口能够至少部分地相互拼合。
对于极片加工过程来说，当对极片进行传输、纠偏、张紧、卷绕等加工工艺时，通过处于连接状态的连接部使相邻成对极耳保持一定的整体性来抵挡弯曲，而在对极耳进行抚平之前或抚平时，断开连接部可以改善极耳交叠的有序性。当断开多桥式连接部时，能够使各个连接桥断开后的第一连接段和第二连接段分别形成第一断口和第二断口，这种断开连接桥所形成的第一断口和第二断口能够至少部分地相互拼合。这样通过多个连接桥的形式的连接部提升相邻成对极耳的整体性，并通过断开全部连接 桥来相邻极耳被抚平时或被抚平后能够有序地交叠，从而更好地兼顾抵抗极耳弯曲和抚平极耳的有序交叠。
在一些实施例中，连接一组或多组所述成对极耳的所有连接部包括处于连接状态的连接部。
在电极组件中，所有连接部可以不全部断开，允许一定比例的连接部保持连接状态，这样有利于降低工艺难度。
在一些实施例中，所述处于连接状态的连接部的数量定义为n1，所有连接一组或多组所述成对极耳的所有连接部的数量定义为n0，n1/n0满足：n1/n0≤1/2。
通过使处于连接状态的连接部的数量少于或等于总的连接部的数量的一半，可以使已抚平的极耳有序交叠，提高焊接质量。
在一些实施例中，n1/n0满足：n1/n0≤1/4。
通过使处于连接状态的连接部的数量少于或等于所有连接部的数量的1/4，可以进一步改善已抚平极耳的有序交叠效果，有效地提高焊接质量。
在一些实施例中，在连接一组或多组所述成对极耳的所有连接部中，所述处于连接状态的连接部在所述卷绕方向上连续相邻的数量定义为nc，nc满足：nc≤4。
考虑到连续多个未断开的连接部可能造成已抚平极耳发生皱褶的现象，导致极耳交叠区域致密层度不均匀，影响焊接质量，因此通过使连续相邻的多个处于连接状态的连接部数量少于等于4个，可以改善极耳交叠均匀性，提升焊接质量。
在一些实施例中，nc满足：nc≤2。
通过使连续相邻的多个处于连接状态的连接部数量少于等于1个，可以进一步改善极耳交叠均匀性，有效地提升焊接质量。
在一些实施例中，在与每层极片卷绕圈连接的多个极耳中，通过所述处于连接状态的连接部分别连接的连续相邻多组所述成对极耳在该层极片卷绕圈对应的角度范围定义为Ri，i为极片卷绕圈所在层的层数，i＝1～N，N为极片卷绕圈的总层数，Ri满足：Ri≤60°。
考虑到连续多个未断开的连接部可能造成已抚平极耳发生皱褶的现象，导致极耳交叠区域致密层度不均匀，影响焊接质量而且不同层的极片卷绕圈的直径不同，使得造成皱褶时不同层对应的连接部的数量也有所区别，通过使各层极片卷绕圈对应的连续多个未断开的连接部所占角度范围小于等于60°，可以改善极耳交叠均匀性，提升焊接质量。
在一些实施例中，Ri满足：Ri≤30°。
通过使各层极片卷绕圈对应的连续多个未断开的连接部所占角度范围小于等于30°，能够有效地改善极耳交叠均匀性，进一步地提升焊接质量
在一些实施例中，连接一组或多组所述成对极耳的所有连接部均为处于断开状态的连接部。
通过使各个连接部均断开，可以使各组相邻极耳被抚平时或被抚平后更有序地交叠，以形成利于焊接的致密极耳交叠结构。
在一些实施例中，在所述卷绕方向上，所述多个极耳中各个极耳的一侧或两侧与相邻极耳之间通过连接部连接。
通过使所有极耳都通过连接部与在一侧或两侧相邻的极耳连接，可以提高各个极耳的整体性，降低极耳在抚平前发生过度弯曲的可能性，从而降低进一步造成的不良率损失、短路或热失控风险。
在一些实施例中，所述多个极耳包括沿所述卷绕方向排布的多个极耳组，每个极耳组包括连续相邻且通过所述连接部连接的多个极耳，相邻极耳组之间不通过所述连接部连接，各个极耳组包括的连接部的数量相等。
通过使各个极耳组包括的连接部数量相同，可以简化极耳的加工工艺，降低加工难度。
在一些实施例中，所述多个极耳包括沿所述卷绕方向排布的多个极耳组，每个极耳组包括连续相邻且通过所述连接部连接的多个极耳，相邻极耳组之间不通过所述连接部连接，所述多个极耳组中至少两个极耳组包括的连接部的数量不相等。
各个极耳组包括的连接部的数量可以根据电极组件的尺寸、形态以及工作环境等多方面因素来进行设计，以满足更多方面的需要，提高电极组件的适应性。
在一些实施例中，各个极耳组包括的连接部的数量从所述集流体基材的卷绕起始端到所述集流体基材的卷绕终止端增加。
考虑到卷绕形式的电极组件中越靠近卷绕起始端的极片卷绕圈的曲率越大，相邻极耳交叠程度越高，未断开的连接部越容易造成该位置的极耳皱褶，而靠近卷绕终止端的极片卷绕圈的曲率较小，相邻极耳交叠程度降低，未断开的连接部则相对不容易造成该位置的极耳皱褶，因此通过使各个极耳组包括的连接部的数量从所述集流体基材的卷绕起始端到所述集流体基材的卷绕终止端增加，可以通过较少的连接部降低靠近卷绕起始端的极耳皱褶发生的几率，并使靠近卷绕终止端的极耳能够通过更多的连 接部来获得极耳间更高的整体性。
在一些实施例中，所述连接部位于所述成对极耳的根部远离所述集流体基材的一侧，所述连接部与所述成对极耳的根部之间包括沿所述集流体基材的厚度方向贯通的镂空区域。
当采用激光裁切极耳的方式时，相邻的成对极耳之间的部分材料被消除，连接部能够与相邻极耳和极耳根部围出镂空区域，这种结构可在连接部的位置形成应力集中，从而有利于连接部的断开，进而有助于提高处于断开状态的连接部的数量。
在一些实施例中，所述连接部位于所述成对极耳的根部和顶部之间的位置，且所述连接部相对于所述成对极耳的顶部朝靠近所述成对极耳的根部的方向凹入。
通过使连接部相对于成对极耳的顶部朝向极耳根部凹入，可以使连接部更容易断开，有助于提高处于断开状态的连接部的数量。
在一些实施例中，所述连接部在所述集流体基材的宽度方向上的至少一侧具有折线边缘。
具有折线边缘的连接部可形成应力集中的易断部位，从而使连接部更容易断开，有助于提高处于断开状态的连接部的数量。
在一些实施例中，所述连接部包括减薄区域，在所述集流体基材的厚度方向上，所述减薄区域的厚度t1低于所述成对极耳中任一极耳的厚度t2。
连接部的减薄区域由于厚度相比于极耳较低，因此易于断开，有助于提高处于断开状态的连接部的数量。
在一些实施例中，通过所述连接部连接的成对极耳中的任一极耳具有加强结构。
通过加强结构提高极耳的强度，在断开连接部时使极耳不容易发生断裂，相应地也使得连接部更容易断开。
在一些实施例中，所述加强结构包括设置于所述极耳表面且沿所述集流体基材的宽度方向延伸的加强筋。
通过在极耳表面设置沿集流体基材的宽度方向延伸的加强筋，可以有效地提高极耳的强度，降低极耳断裂的风险，提高连接部的易断程度。
在一些实施例中，所述连接部的材料的拉伸强度低于所述成对极耳中任一极耳的材料的拉伸强度。
通过使连接部的材料的拉伸强度低于成对极耳中任一极耳的材料的拉伸强度，从而在断开连接部的过程中通过施加对极耳部分的拉力即可使连接部在受拉作用断开， 节省分别对各个连接部进行切断操作的时间，提高加工效率。
在本公开的一个方面，提供一种电池单体，包括：前述的电极组件。
采用前述电极组件的电池单体可有效地提升使用安全性。
在一些实施例中，所述电池单体还包括：外壳，具有容纳所述电极组件的腔室；电极端子，设置在所述外壳的壁部；和导电件，与所述电极组件中多个极耳在卷绕结构的端部堆叠成的极耳堆叠结构焊接，并与所述电极端子电连接。
通过导电件与设置在外壳壁部的电极端子电连接，并与电极组件在卷绕结构端部堆叠的多个极耳进行焊接，堆叠的多层极耳结构具有更高的厚度，在与导电件焊接时不容易被焊穿，以免焊接时烫伤电极组件中隔膜或极片等结构导致短路等风险，从而在改善焊接区域的焊接质量的同时，降低电池单体的短路风险，提高使用安全性。
在一些实施例中，所述外壳包括壳体和端盖，所述壳体的一端具有开口，所述端盖盖合于所述开口，所述壳体包括侧壁和底壁，所述侧壁环绕于所述电极组件的外侧，所述底壁与所述开口相对设置，所述外壳的壁部为所述端盖或所述底壁。
导电件与设置在端盖或壳体的底壁上的电极端子电连接，并与电极组件的极耳堆叠结构焊接，在对焊接区域的焊接质量的改善的同时，降低电池单体的短路风险，提高使用安全性。
在本公开的一个方面，提供一种电池，包括：前述的电池单体。
采用前述电池单体的电池可有效地提升使用安全性。
在本公开的一个方面，提供一种用电装置，包括：前述的电池。
采用前述电池的用电装置可有效地提升使用安全性。
在本公开的一个方面，提供一种电极组件的制造方法，包括：
提供多个极片和隔离件，其中所述多个极片中的至少一个包括：集流体基材、多个极耳和连接部，所述集流体基材的表面设有活性物质层，所述多个极耳连接在所述集流体基材沿所述集流体基材的长度方向延伸的至少一个侧边上，所述多个极耳沿所述集流体基材的长度方向间隔排布，并且相邻两个极耳形成一组成对极耳，所述连接部连接在一组或多组所述成对极耳中的所述相邻两个极耳之间，且处于连接状态；
将所述隔离件设置在所述多个极片中极性相反的相邻两个极片之间，并将所述多个极片和所述隔离件沿卷绕方向卷绕成卷绕结构；
使连接一组或多组所述成对极耳的连接部中的一部分或全部断开，并对所述多个极耳进行折弯，以使所述多个极耳在所述卷绕结构的端部堆叠。
通过连接在多个极耳中沿所述卷绕方向相邻的一组或多组成对极耳之间且处于连接状态的连接部可以在极片进行传输、纠偏、张紧、卷绕等加工工艺中使极耳保持一定的整体性来抵抗弯曲，降低过度弯曲带来的弯折或插入到活性物质层的风险，通过将连接部的一部分或全部断开，并对极耳进行折弯抚平，折弯抚平的相邻极耳在断开连接部后能够被有序的交叠，从而有利于形成更致密的极耳交叠结构，改善焊接质量。
附图说明
为了更清楚地说明本公开实施例的技术方案，下面将对本公开实施例中所需要使用的附图作简单地介绍，显而易见地，下面所描述的附图仅仅是本公开的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据附图获得其他的附图。
参照附图，根据下面的详细描述，可以更加清楚地理解本公开，其中：
图1是根据本公开用电设备的一些实施例的结构示意图；
图2是根据本公开电池的一些实施例的分解示意图；
图3是根据本公开电池的一些实施例中多个电池单体的连接示意图；
图4是根据本公开电池单体的一些实施例的分解示意图；
图5是根据本公开电池单体的一些实施例通过卷绕轴CL的纵截面示意图；
图6是根据本公开电池单体的一些实施例中电极组件和导电件的分解示意图；
图7是根据本公开电极组件的一些实施例中卷绕结构的横截面示意图；
图8是根据本公开电极组件的一些实施例中极片及极耳在展开状态下的示意图；
图9是根据本公开电极组件的一些实施例中极片上的相邻极耳间处于断开状态和处于连接状态的连接部的示意图；
图10是根据本公开电极组件的一些实施例中各个极片卷绕圈上通过处于连接状态的连接部分别连接的连续相邻多组极耳对应的角度范围的示意图；
图11是根据本公开电极组件的一些实施例中单桥式连接部和多桥式连接部的示意图；
图12A是根据本公开电极组件的另一些实施例中处于断开状态和连接状态的单桥式连接部的示意图；
图12B是根据本公开电极组件的另一些实施例中处于断开状态和连接状态的多桥 式连接部的示意图；
图13-图15分别是根据本公开电极组件的一些实施例中极片采用不同设置形式的连接部的示意图；
图16是根据本公开电极组件的一些实施例中极片的极耳设置加强结构的示意图；
图17是根据本公开电极组件的一些实施例中极片的多个相邻极耳之间设置连接部的示意图；
图18是图17中AA截面的示意图；
图19是根据本公开电极组件的另一些实施例中极片的多个相邻极耳之间设置连接部的示意图；
图20是图19中BB截面的示意图；
图21是根据本公开电极组件的制造方法的一些实施例的流程示意图。
应当明白，附图中所示出的各个部分的尺寸并不是按照实际的比例关系绘制的。此外，相同或类似的参考标号表示相同或类似的构件。
附图标记说明：
1-电极组件；11-极片；11a-正极极片；11b-负极极片；110-极片卷绕圈；111-集流
体基材；112-极耳；112r-根部；112t-顶部；112s-加强筋；113-连接部；113A-处于断开状态的连接部；113B-处于连接状态的连接部；1131-第一连接段；1132-第二连接段；1133-减薄区域；1134-折线边缘；113s-单桥式连接部；113m-多桥式连接部；114-活性物质层；
2-电池单体；21-外壳；211-壳体；211a-侧壁；211b-底壁；211c-开口；211d-通孔；
212-端盖；22-电极端子；23-导电件；24-绝缘件；25-电极引出部；26-汇流条；27-泄压部件；
3-电池；31-箱体；32-箱盖；
4-车辆；
wd-卷绕方向；CL-卷绕轴；WS-卷绕起始端；WE-卷绕终止端；d1-集流体基材的
长度方向；d2-集流体基材的宽度方向；d3-集流体基材的厚度方向；fr1-第一断口；fr2-第二断口；G1、G2、G3-极耳组。
具体实施方式
下面结合附图和实施例对本公开的实施方式作进一步详细描述。以下实施例的详 细描述和附图用于示例性地说明本公开的原理，但不能用来限制本公开的范围，即本公开不限于所描述的实施例。
在本公开的描述中，需要说明的是，除非另有说明，“多个”的含义是两个以上；术语“上”、“下”、“左”、“右”、“内”、“外”等指示的方位或位置关系仅是为了便于描述本公开和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本公开的限制。此外，术语“第一”、“第二”、“第三”等仅用于描述目的，而不能理解为指示或暗示相对重要性。“垂直”并不是严格意义上的垂直，而是在误差允许范围之内。“平行”并不是严格意义上的平行，而是在误差允许范围之内。
下述描述中出现的方位词均为图中示出的方向，并不是对本公开的具体结构进行限定。在本公开的描述中，还需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是直接相连，也可以通过中间媒介间接相连。对于本领域的普通技术人员而言，可视具体情况理解上述术语在本公开中的具体含义。
下面结合附图，对本发明的一些实施方式作详细说明。在不冲突的情况下，下述的实施例中的特征可以相互组合。
本公开中出现的“多个”指的是两个以上(包括两个)。
本公开实施例中，电池单体可以为二次电池，二次电池是指在电池单体放电后可通过充电的方式使活性材料激活而继续使用的电池单体。
电池单体可以为锂离子电池、钠离子电池、钠锂离子电池、锂金属电池、钠金属电池、锂硫电池、镁离子电池、镍氢电池、镍镉电池、铅蓄电池等，本申请实施例对此并不限定。
电池单体一般包括电极组件。电极组件包括多个极片和设置在相邻两个极片之间的隔离件。多个极片可包括极性相反的正极极片和负极极片。在电池单体充放电过程中，活性离子(例如锂离子)在正极极片和负极极片之间往返嵌入和脱出。隔离件设置在正极极片和负极极片之间，可以起到防止正负极短路的作用，同时可以使活性离子通过。
在一些实施方式中，正极极片可以包括正极集流体基材以及设置在正极集流体基材至少一个表面的正极活性材料层。
作为示例，正极集流体基材具有在其自身厚度方向相对的两个表面，正极活性材 料层设置在正极集流体基材相对的两个表面的任意一者或两者上。
作为示例，正极集流体基材可采用金属箔片或复合集流体。例如，作为金属箔片，可采用银表面处理的铝或不锈钢、不锈钢、铜、铝、镍、炭精电极、碳、镍或钛等。复合集流体可包括高分子材料基层和金属层。复合集流体可通过将金属材料(铝、铝合金、镍、镍合金、钛、钛合金、银及银合金等)在高分子材料基材(如聚丙烯、聚对苯二甲酸乙二醇酯、聚对苯二甲酸丁二醇酯、聚苯乙烯、聚乙烯等的基材)上而形成。
作为示例，正极活性材料层可包括以下材料中的至少一种：含锂磷酸盐、锂过渡金属氧化物及其各自的改性化合物。但本公开并不限定于这些材料，还可以使用其他可被用作电池正极活性材料层的传统材料。这些正极活性材料层可以仅单独使用一种，也可以将两种以上组合使用。其中，含锂磷酸盐的示例可包括但不限于磷酸铁锂(如LiFePO4(也可以简称为LFP))、磷酸铁锂与碳的复合材料、磷酸锰锂(如LiMnPO4)、磷酸锰锂与碳的复合材料、磷酸锰铁锂、磷酸锰铁锂与碳的复合材料中的至少一种。锂过渡金属氧化物的示例可包括但不限于锂钴氧化物(如LiCoO2)、锂镍氧化物(如LiNiO2)、锂锰氧化物(如LiMnO2、LiMn2O4)、锂镍钴氧化物、锂锰钴氧化物、锂镍锰氧化物、锂镍钴锰氧化物(如LiNi1/3Co1/3Mn1/3O2(也可以简称为NCM333)、LiNi0.5Co0.2Mn0.3O2(也可以简称为NCM523)、LiNi0.5Co0.25Mn0.25O2(也可以简称为NCM211)、LiNi0.6Co0.2Mn0.2O2(也可以简称为NCM622)、LiNi0.8Co0.1Mn0.1O2(也可以简称为NCM811)、锂镍钴铝氧化物(如LiNi0.85Co0.15Al0.05O2)及其改性化合物等中的至少一种。
在一些实施方式中，负极极片可以包括负极集流体基材以及设置在负极集流体基材至少一个表面上的负极活性材料层。
作为示例，负极集流体基材可采用金属箔片、泡沫金属或复合集流体。例如，作为金属箔片，可以采用银表面处理的铝或不锈钢、不锈钢、铜、铝、镍、炭精电极、用碳、镍或钛等。泡沫金属可以为泡沫镍、泡沫铜、泡沫铝、泡沫合金、或泡沫碳等。复合集流体可包括高分子材料基层和金属层。复合集流体可通过将金属材料(铜、铜合金、镍、镍合金、钛、钛合金、银及银合金等)在高分子材料基材(如聚丙烯、聚对苯二甲酸乙二醇酯、聚对苯二甲酸丁二醇酯、聚苯乙烯、聚乙烯等的基材)上而形成。
作为示例，负极集流体基材具有在其自身厚度方向相对的两个表面，负极活性材 料层设置在负极集流体基材相对的两个表面中的任意一者或两者上。
作为示例，负极活性材料层可采用本领域公知的用于电池单体的负极活性材料层。作为示例，负极活性材料层可包括以下材料中的至少一种：人造石墨、天然石墨、软炭、硬炭、硅基材料、锡基材料和钛酸锂等。硅基材料可选自单质硅、硅氧化合物、硅碳复合物、硅氮复合物以及硅合金中的至少一种。锡基材料可选自单质锡、锡氧化合物以及锡合金中的至少一种。但本公开并不限定于这些材料，还可以使用其他可被用作电池负极活性材料层的传统材料。这些负极活性材料层可以仅单独使用一种，也可以将两种以上组合使用。
在一些实施方式中，正极集流体基材的材料可以为铝，负极集流体基材的材料可以为铜。
在一些实施方式中，电极组件还包括隔离件，隔离件设置在正极极片和负极极片之间。
在一些实施方式中，隔离件为隔离膜。本公开对隔离膜的种类没有特别的限制，可以选用任意公知的具有良好的化学稳定性和机械稳定性的多孔结构隔离膜。
作为示例，隔离膜的主要材质可选自玻璃纤维、无纺布、聚乙烯、聚丙烯、聚偏二氟乙烯、陶瓷中的至少一种。隔离膜可以是单层薄膜，也可以是多层复合薄膜，没有特别限制。在隔离膜为多层复合薄膜时，各层的材料可以相同或不同，没有特别限制。隔离件可以是单独的一个部件位于正极极片和负极极片之间，也可以附着在正极极片的表面和/或负极极片的表面。
在一些实施方式中，隔离件为固态电解质。固态电解质设于正极极片和负极极片之间，同时起到传输离子和隔离正负极的作用。
在一些实施方式中，电池单体还包括电解质，电解质在正、负极之间起到传导离子的作用。本公开对电解质的种类没有具体的限制，可根据需求进行选择。电解质可以是液态的、凝胶态的或固态的。
作为示例，液态电解质包括电解质盐和溶剂。
在一些实施方式中，电解质盐可选自六氟磷酸锂、四氟硼酸锂、高氯酸锂、六氟砷酸锂、双氟磺酰亚胺锂、双三氟甲磺酰亚胺锂、三氟甲磺酸锂、二氟磷酸锂、二氟草酸硼酸锂、二草酸硼酸锂、二氟二草酸磷酸锂及四氟草酸磷酸锂中的至少一种。
在一些实施方式中，溶剂可选自碳酸亚乙酯、碳酸亚丙酯、碳酸甲乙酯、碳酸二乙酯、碳酸二甲酯、碳酸二丙酯、碳酸甲丙酯、碳酸乙丙酯、碳酸亚丁酯、氟代碳酸 亚乙酯、甲酸甲酯、乙酸甲酯、乙酸乙酯、乙酸丙酯、丙酸甲酯、丙酸乙酯、丙酸丙酯、丁酸甲酯、丁酸乙酯、1,4-丁内酯、环丁砜、二甲砜、甲乙砜及二乙砜中的至少一种。溶剂也可选醚类溶剂。醚类溶剂可以包括乙二醇二甲醚、乙二醇二乙醚、二乙二醇二甲醚、三乙二醇二甲醚、四乙二醇二甲醚、1,3-二氧戊环、四氢呋喃、甲基四氢呋喃、二苯醚及冠醚中的一种或多种。
作为示例，凝胶态电解质包括以聚合物作为电解质的骨架网络，搭配离子液体-锂盐。
作为示例，固态电解质包括聚合物固态电解质、无机固态电解质、复合固态电解质。
作为示例，聚合物固态电解质可以为聚醚(聚氧化乙烯)、聚硅氧烷、聚碳酸酯、聚丙烯腈、聚偏氟乙烯、聚甲基丙烯酸甲酯、单离子聚合物、聚离子液体-锂盐、纤维素等。
作为示例，无机固态电解质可以为氧化物固体电解质(晶态的钙钛矿、钠超导离子导体、石榴石、非晶态的LiPON薄膜)、硫化物固体电解质(晶态的锂超离子导体(锂锗磷硫、硫银锗矿)、非晶体硫化物)以及卤化物固体电解质、氮化物固体电解质及氢化物固体电解质中的一种或多种。
作为示例，复合固态电解质通过在聚合物固体电解质中增加无机固态电解质填料形成。
在一些实施方式中，电极组件包括卷绕结构。正极极片、负极极片和隔离件卷绕成卷绕结构。正极极片、负极极片可分别设置一个或多个。作为示例，多个正极极片和多个负极极片沿极片厚度方向交替设置。
在一些实施方式中，电极组件的形状可以为圆柱状、扁平状或多棱柱状等。
在一些实施方式中，电极组件包括极耳，极耳可以将电流从电极组件导出。极耳可包括正极极耳和负极极耳，分别连接正极集流体基材和负极集流体基材。极耳可通过切割或裁切集流体基材的方式形成，也可以通过焊接方式连接在集流体基材的侧边。
在一些实施方式中，电池单体可以包括外壳。外壳用于封装电极组件及电解质等部件。外壳可以为钢壳、铝壳、塑料壳(如聚丙烯)、复合金属壳(如铜铝复合外壳)或铝塑膜等。
作为示例，电池单体可以为圆柱形电池单体、棱柱电池单体、软包电池单体或其它形状的电池单体，棱柱电池单体包括方壳电池单体、刀片形电池单体、多棱柱电池， 多棱柱电池例如为六棱柱电池等。
本公开实施例所提到的电池是指包括一个或多个电池单体以提供更高的电压和容量的单一的物理模块。
在一些实施例中，电池可以为电池模块，电池单体有多个时，多个电池单体排列并固定形成一个电池模块。电池模组可包括串联、并联或混联的多个电池单体。
在一些实施例中，电池可以为电池包，电池包包括箱体和电池单体，电池单体或电池模块容纳于箱体中。
在一些实施例中，箱体可以作为车辆的底盘结构的一部分。例如，箱体的部分可以成为车辆的地板的至少一部分，或者，箱体的部分可以成为车辆的横梁和纵梁的至少一部分。
在一些实施例中，电池可以为储能装置。储能装置包括储能集装箱、储能电柜等。
在一些相关技术中，圆柱电池中的极片主要由集流体基材和设置在集流体基材表面的活性物质层构成，在极片宽度方向上，集流体基材超出活性物质层的部分为汇流输出区域。该区域通过裁切获得位于集流体基材侧边的多个尺寸较小的极耳，相邻极耳之间设有切开的断口，从而使各个极耳相互独立。
极片进行卷绕加工时，极片通常会经过例如走带、纠偏、张紧等功能辊。在极片运动较快时，极耳可能因离心力的作用而向外过度弯曲。另外极片在绕卷针进行卷绕时，极耳也存在因卷绕圈的曲率较大而过度弯曲的可能。当极耳过度弯曲时，极耳可能在被抚平时发生向下翻折的情况，并有可能极耳向下插入到活性物质层的位置。这将导致电极组件以至于电池单体的不良率损失，而且极耳的翻折和向下插入可能导致搭接短路风险。
另一个可能的风险是，阴极极耳在下探到活性物质层的位置时可能遮挡一部分阴极活性材料，这在进行电池质量测试时不容易有效检出。在长时间使用后下探极耳的周边对应于阳极极片的位置可能析锂并形成搭接，从而造成长时间使用时的短路风险，进而造成电池的热失控。
有鉴于此，本公开实施例提供一种电极组件，包括多个极片和位于所述多个极片中极性相反的相邻两个极片之间的隔离件，所述多个极片和所述隔离件沿卷绕方向卷绕成卷绕结构。所述多个极片中的至少一个包括：集流体基材、多个极耳和连接部。所述集流体基材的表面设有活性物质层。多个极耳连接在所述集流体基材沿所述卷绕方向延伸的至少一个侧边上，所述多个极耳沿所述卷绕方向间隔排布，并且相邻两个 极耳形成一组成对极耳。连接部连接在一组或多组所述成对极耳中的所述相邻两个极耳之间。
通过在沿卷绕方向相邻的一组或多组成对极耳之间设置连接部，可以使多个极耳保持一定的整体性，在对极片进行卷绕、纠偏、张紧等加工处理时，使极耳不容易过度弯曲而造成弯折或插入到活性物质层，降低由此造成的短路或热失控风险，从而改善电池的使用安全性。
本公开实施例的电池单体可适用于各类电池。电池可包括箱体和电池模组，箱体用于为电池模组提供容纳空间，电池模组安装在箱体内。箱体可采用金属材质。电池模组可包括串联、并联或混联的多个电池单体。电池单体为组成电池的最小单元。电池单体包括能够发生电化学反应的电极组件。
本公开实施例的电池可适用于各类使用电池的用电设备。用电设备可以是手机、便携式设备、笔记本电脑、电瓶车、电动汽车、轮船、航天器、电动玩具和电动工具等等，例如，航天器包括飞机、火箭、航天飞机和宇宙飞船等，电动玩具包括固定式或移动式的电动玩具，例如，游戏机、电动汽车玩具、电动轮船玩具和电动飞机玩具等等，电动工具包括金属切削电动工具、研磨电动工具、装配电动工具和铁道用电动工具，例如，电钻、电动砂轮机、电动扳手、电动螺丝刀、电锤、冲击电钻、混凝土振动器和电刨。本公开实施例对上述用电设备不做特别限制。电池可用于车辆等用电设备的供电，例如给车辆提供操控用的电源或者驱动行驶用的电源。
图1是根据本公开用电设备的一些实施例的结构示意图。为了方便，以用电装置为车辆为例进行说明。车辆4可以为燃油汽车、燃气汽车或新能源汽车，新能源汽车可以是纯电动汽车或混合动力汽车等。在车辆4的底部或车头或车尾可以设置电池3。
电池3可以用于车辆4的供电，例如，电池3可以作为车辆4的操作电源，用于车辆4的电路系统，例如用于车辆4的启动、导航和运行时的工作用电需求。电池3不仅仅可以作为车辆4的操作电源，还可以作为车辆4的驱动电源，替代或部分替代燃油或天然气为车辆4提供驱动力。
车辆4的内部还可以设置车桥、车轮、马达以及控制器，控制器用来控制电池3给马达的供电。例如，在车辆4以电池3作为驱动电源时，电池3代替或部分地代替燃油或天然气为马达提供匀速、加速的所需要的动力。马达用于驱动车桥转动，以带动车轮转动。
图2是根据本公开电池的一些实施例的分解示意图。图3是根据本公开电池的一 些实施例中多个电池单体的连接示意图。
参考图2，在一些实施例中，电池3包括箱体31、盖在箱体31的开口侧的箱盖32以及设置于箱体31中的一个或者多个电池单体2。箱体31和箱盖32可给电池单体2提供容纳空间，并提供冷却、密封及防撞击等功能，还能够避免液体或其他异物对电池单体的充放电或安全的不利影响。
箱体31和箱盖32可以是多种形状，例如长方体或圆柱体等。箱体31可以是一侧开放的空心结构，箱盖32为板状结构。箱盖32盖合于箱体31的开放侧，则形成内部的容纳空间。在另一实施例中，箱体31为一侧开放的空心结构，箱盖32也为一侧开放的空心结构，箱盖32的开放侧盖合于箱体31的开放侧，则形成内部的容纳空间。
参考图2和图3，各个电池单体2之间电连接，比如串联、并联或者混联，以实现所需要的电池3的电性能参数。混联是指多个电池单体2中既有串联又有并联。相邻电池单体2之间可通过汇流条26进行电连接。多个电池单体2成排设置，根据需要可以在箱体31内设置一排或者多排电池单体2。
在一些实施例中，电池3的各电池单体2可以沿着箱体31的长度方向和宽度方向中的至少一个排列。根据实际需要可设置至少一行或一列电池单体2。根据需要，还可以在电池3的高度方向，也可设置一层或者多层电池单体2。
在一些实施例中，多个电池单体2可先串联或并联或混联组成电池模块，然后多个电池模块再串联或并联或混联形成一个整体，并容纳于箱体31内。在另一些实施例中，所有电池单体2直接串联或并联或混联在一起，再将所有电池单体2构成的整体容纳于箱体内。
图4是根据本公开电池单体的一些实施例的分解示意图。图5是根据本公开电池单体的一些实施例通过卷绕轴CL的纵截面示意图。图6是根据本公开电池单体的一些实施例中电极组件和导电件的分解示意图。图7是根据本公开电极组件的一些实施例中卷绕结构的横截面示意图。
参考图3到图7，在一些实施例中，电池单体2包括：电极组件1。电极组件1包括多个极片11和设置在所述多个极片11中极性相反的相邻两个极片(例如图7中正极极片11a和负极极片11b)之间的隔离件12。多个极片11和所述隔离件12沿卷绕方向wd卷绕并形成卷绕结构10。
在图7中，正极极片10a和负极极片10b在卷绕结构10中分别形成的极片卷绕圈至少部分地从外到内交替排布。隔离件12可以以隔离膜的形式设置在正极极片10a 和负极极片10b之间。
参考图4和图5，在一些实施例中，电池单体2还包括：外壳21、电极端子22和导电件23。外壳21具有容纳所述电极组件1的腔室。电极端子22设置在外壳21的壁部，并与导电件23进行电连接。导电件23还与电极组件1电连接。
外壳21的空腔除了容纳电极组件1，还可容纳电解液。外壳21的形状可根据空腔中容纳的一个或多个电极组件1的形状而定，例如外壳21的形状为中空长方体或中空正方体或中空圆柱体。
在图4和图5中，外壳21可包括壳体211和端盖212。壳体211为一端或两端设有开口211c的空心结构，其材质可以为一种或多种，例如铜、铁、铝、钢、铝合金、塑料等。端盖212可以采用金属或非金属的材质，可通过焊接、粘接或紧固件连接等方式与壳体211进行固定连接。
壳体211的一端具有开口211c，端盖212盖合于所述开口211c。在图5中，所述壳体211可包括侧壁211a和底壁211b。所述侧壁211a环绕于所述电极组件1的外侧，所述底壁211b与所述开口211c相对设置。所述外壳21的壁部为所述端盖212或所述底壁211b。相应地，电极端子22可设置在端盖212上，也可设置在底壁211b上。
对于圆柱形电池单体来说，壳体211可以为一端具有开口211c的圆柱形中空结构，端盖212可以为圆盘形结构，与开口211c相匹配。电极端子22可设置在壳体211远离端盖212一侧的底壁211b。
在图4中，底壁211b可设有通孔211d。参考图5，电极端子22可通过电极引出部25和绝缘件24设置在该通孔211d上。电极引出部25可至少部分凸出于底壁211b的外表面，以便于通过汇流条26(如图3所示)实现不同电池单体2之间的电连接。绝缘件24用于实现电极引出部25与壳体211之间的绝缘，可采用橡胶或塑料材质。可选地，在壳体的两端均设有开口，并均通过端盖进行盖合，电极引出部和电极端子可设置在端盖上。
参考图4和图5，在端盖212上可设置泄压部件27。泄压部件是指电池单体的内部压力或温度达到预定阈值时致动以泄放内部压力或温度的元件或部件。该阈值设计根据设计需求不同而不同。所述阈值可能取决于电池单体中的正极极片、负极极片、电解液和隔离膜中一种或几种的材料。泄压部件可以采用诸如防爆阀、气阀、泄压阀或安全阀等的形式，并可以具体采用压敏或温敏的元件或构造，即，当电池单体的内部压力或温度达到预定阈值时，泄压部件执行动作或者泄压部件中设有的薄弱结构被 破坏，从而形成可供内部压力或温度泄放的开口或通道。
此处提到的来自电池单体的排放物包括但不限于：电解液、被溶解或分裂的正负极极片、隔离膜的碎片、反应产生的高温高压气体(如CH4、CO等可燃气体)、火焰，等等。
参考图4到图6，对于圆柱形的卷绕结构10来说，导电件23可沿卷绕结构10的卷绕轴CL的延伸方向位于电极组件1的两侧。在另一些实施例中，导电件23也可以沿卷绕结构10的卷绕轴CL的延伸方向位于电极组件1的一侧。
在图5中，电极组件10两侧的导电件23分别与电极组件10两侧的端部的极耳112进行焊接，并分别与电极引出部25和端盖212进行焊接。导电件23可作为集流件来实现电极组件与电极端子以及端盖等结构之间的电连接。导电件可以为金属导体，例如铜、铁、铝、钢、铝合金等。在一些实施例中，导电件可以包括集流盘，也可以包括其他结构。
图8是根据本公开电极组件的一些实施例中极片及极耳在展开状态下的示意图。参考图8，所述多个极片11中的至少一个包括：集流体基材111、多个极耳112和连接部113。集流体基材111的表面设有活性物质层114。
在一些实施例中，图8所示的极片11可以为正极极片，包括的集流体基材111为前文中的正极集流体基材，活性物质层114为前文中的正极活性物质层。在另一些实施例中，极片11也可以为负极极片，包括的集流体基材111为前文中的负极集流体基材，活性物质层114为前文中的负极活性物质层。
多个极耳112连接在所述集流体基材111沿卷绕方向wd(即展平的集流体基材111的长度方向d1)延伸的至少一个侧边上，所述多个极耳112沿所述卷绕方向wd间隔排布，并且相邻两个极耳112形成一组成对极耳112。
在图8中，集流体基材111的长度方向d1可以为从卷绕起始端WS指向卷绕终止端WE的方向，也可以为从卷绕终止端WE指向卷绕起始端WS的方向。集流体基材111的宽度方向d2与可与集流体基材111的长度方向d1垂直。
连接部113连接在一组或多组成对极耳112中的所述相邻两个极耳112之间。
这里，沿卷绕方向wd相邻的一组成对极耳112指的是沿卷绕方向wd相邻的两个极耳112，沿卷绕方向wd相邻的多组成对极耳112指的是沿卷绕方向wd相邻的三个以上极耳112。例如相邻的三个极耳112为两组成对极耳112，居中的极耳112既被包括在第一组成对极耳中，也被包括在第二组成对极耳中。
连接部113设置在一组或多组成对极耳112中的所述相邻两个极耳112之间，可以使多个极耳112保持一定的整体性，在对极片11进行卷绕、纠偏、张紧等加工处理时，使极耳112不容易过度弯曲而造成弯折或插入到活性物质层114，降低由此造成的不良率损失、短路或热失控风险。
在一些实施例中，极耳高度和宽度均在3～10mm之间，相邻极耳之间的间隙小于2mm。为了方便显示连接部和相邻成对极耳的位置关系，图8以及后续的说明书附图中有关极耳、连接部的尺寸都是示意性的，并非按照实际的比例关系绘制。
图9是根据本公开电极组件的一些实施例中极片上的相邻极耳间处于断开状态和处于连接状态的连接部的示意图。
前面实施例中的连接部113可具有不同的状态，例如断开状态或者连接状态。参考图9，在一些实施例中，连接一组或多组所述成对极耳112的所有连接部113包括处于断开状态的连接部113A。
在电极组件1中，断开的连接部113可以使相邻极耳112被抚平时或被抚平后能够有序地交叠，以形成利于焊接的比较致密的极耳交叠结构。
为了使极耳堆叠结构更加致密，提高其与导电件的焊接质量，在一些实施例中，连接一组或多组所述成对极耳112的所有连接部113均为处于断开状态的连接部113A。
通过使各个连接部113均断开，可以使各组相邻极耳112被抚平时或被抚平后更有序地交叠，以形成利于焊接的致密极耳交叠结构。
参考图9，在一些实施例中，连接一组或多组所述成对极耳112的所有连接部113还包括处于连接状态的连接部113B。也就是说，连接一组或多组所述成对极耳112的连接部113中既包括处于断开状态的连接部113A，也包括处于连接状态的连接部113B。这样通过允许在电极组件中一定比例的连接部保持连接状态，这样有利于降低工艺难度。
考虑到处于连接状态的连接部113B可影响相邻两个或更多极耳的交叠有序性，处于连接状态的连接部113B越多，对极耳堆叠结构的致密性影响也相应增大。因此，可将所述处于连接状态的连接部113B的数量定义为n1，并将所有连接一组或多组所述成对极耳112的所有连接部113的数量定义为n0。
通过使n1/n0满足：n1/n0≤1/2，即使得处于连接状态的连接部113B的数量少于或等于总的连接部113的数量的一半，可以使已抚平的极耳112有序交叠，提高焊接质量。
可选地，使n1/n0满足：n1/n0≤1/4，例如使n1/n0等于1/16、1/8、3/16、1/4等。通过使处于连接状态的连接部113B的数量少于或等于总的连接部113的数量的1/4，可以进一步改善已抚平极耳112的有序交叠效果，有效地提高焊接质量。
除了处于连接状态的连接部的数量对极耳堆叠结构的致密性有所影响，连续通过处于连接状态的连接部连接的多个相邻极耳由于连接部都未断开，容易使已抚平极耳112发生皱褶的现象，从而使极耳112交叠区域致密层度不均匀，影响焊接质量。因此，可在连接一组或多组所述成对极耳112的所有连接部113中，将所述处于连接状态的连接部113B在所述卷绕方向wd上连续相邻的数量定义为nc。
通过使nc满足：nc≤4，即使得连续相邻的多个处于连接状态的连接部113B数量少于等于4个，可以改善极耳112交叠均匀性，提升焊接质量。
可选地，使nc满足：nc≤2，例如使nc等于1或2。通过使连续相邻的多个处于连接状态的连接部113B数量小于等于2个，可以进一步改善极耳112交叠均匀性，有效地提升焊接质量。
图10是根据本公开电极组件的一些实施例中各个极片卷绕圈上通过处于连接状态的连接部分别连接的连续相邻多组极耳对应的角度范围的示意图。
连续多个未断开的连接部113可造成已抚平极耳112发生皱褶的现象，导致极耳112交叠区域致密层度不均匀。而且，对于卷绕结构来说，由于不同层的极片卷绕圈110的直径不同，对应的极片卷绕圈的曲率不同，越远离卷绕轴的极片卷绕圈所连接的相邻极耳交叠程度越小，造成的极耳皱褶较不明显。相反地，越靠近卷绕轴的极片卷绕圈所连接的相邻极耳交叠程度越大，造成的极耳皱褶比较明显。因此，不同层的极片卷绕圈允许的连续多个未断开的连接部113的数量可有所不同。
参考图10，在一些实施例中，在与每层极片卷绕圈110连接的多个极耳112中，可将通过所述处于连接状态的连接部113B分别连接的连续相邻多组所述成对极耳112在该层极片卷绕圈110对应的角度范围定义为Ri，i为极片卷绕圈110所在层的层数，i＝1～N，N为极片卷绕圈的总层数。
在图11中，最靠近卷绕轴的极片卷绕圈对应的i为1，即R1，最外层的极片卷绕圈对应的i为N，即RN。通过使Ri满足：Ri≤60°，即使得通过使各层极片卷绕圈110对应的连续多个未断开的连接部113所占角度范围小于等于60°，可以改善极耳112交叠均匀性，提升焊接质量。
可选地，使Ri满足：Ri≤30°，例如Ri可等于10°、15°、20°、25°、30°。通过使 各层极片卷绕圈110对应的连续多个未断开的连接部113所占角度范围小于等于30°，能够有效地改善极耳112交叠均匀性，进一步地提升焊接质量。
图11是根据本公开电极组件的一些实施例中单桥式连接部和多桥式连接部的示意图。参考图11，在一些实施例中，连接一组或多组所述成对极耳112的所有连接部113中的至少一个为包括单个连接桥的单桥式连接部113s和包括沿所述集流体基材111的宽度方向d2间隔排布的多个连接桥的多桥式连接部113m中的一种。
在图11中，在相邻两个极耳112之间只有一个连接桥的连接部即为单桥式连接部113s，在相邻两个极耳112之间有两个或两个以上连接桥，且两个或两个以上连接桥沿所述集流体基材111的宽度方向d2间隔排布，即为多桥式连接部113m。
在一个电极组件中，可将所有连接桥均设置为单桥式连接部113s，将所有连接桥均设置为多桥式连接部113m，或者将所有连接桥的一部分设置为单桥式连接部113s，另一部分设置为多桥式连接部113m。各个单桥式连接部113s包含的连接桥在集流体基材111的宽度方向d2上的位置、宽度、间距等可以相同也可以不同。各个多桥式连接部113包含的连接桥在集流体基材111的宽度方向d2上的数量、位置、宽度及间距等可以相同也可以不同。
图12A是根据本公开电极组件的另一些实施例中处于断开状态和连接状态的单桥式连接部的示意图。图12B是根据本公开电极组件的另一些实施例中处于断开状态和连接状态的多桥式连接部的示意图。
参考图12A，在一些实施例中，连接一组或多组所述成对极耳112的所有连接部113中的至少一个为包括单个连接桥的单桥式连接部113s。在图12A中，处于断开状态的单桥式连接部113s标记为113s’，而处于连接状态的单桥式连接部113s标记为113s”。
处于断开状态的单桥式连接部113s包括与所述成对极耳112中的一个极耳112连接的第一连接段1131和与所述成对极耳112中的另一个极耳112连接的第二连接段1132，所述第一连接段1131与所述第二连接段1132相互分离，所述第一连接段1131具有第一断口fr1，所述第二连接段1132具有第二断口fr2，所述第一断口fr1与所述第二断口fr2能够至少部分地相互拼合。
对于极片11的加工过程来说，当对极片11进行传输、纠偏、张紧、卷绕等加工工艺时，通过处于连接状态的连接部113s使相邻成对极耳112保持一定的整体性来抵挡弯曲。在对极耳112进行抚平之前或抚平时，断开单桥式连接部113s可以改善极耳 112交叠的有序性，而且单个连接桥更容易断开。
单桥式连接部113s可在受到外力作用下断开，并随着单桥式连接部113s的断开形成相互分离的第一连接段1131和第二连接段1132，而且断开的位置分别形成了第一连接段1131的第一断口fr1和第二连接段1132的第二断口fr2。由于第一断口fr1和第二断口fr2是在外力作用下断开后形成的，因此，第一断口fr1和第二断口fr2能够至少部分地相互拼合。
这里单桥式连接部113s的断开可采用多种方式，例如通过对连接部113施加拉力或剪力来拉断或剪断单桥式连接部113s。
参考图12B，在一些实施例中，所述连接一组或多组所述成对极耳112的所有连接部113中的至少一个为包括沿所述集流体基材111的宽度方向d2间隔排布的多个连接桥的多桥式连接部113m。在图12B中，处于断开状态的多桥式连接部113m标记为113m’，而处于连接状态的多桥式连接部113m标记为113m”。
处于断开状态的多桥式连接部113m中的每个连接桥均包括与所述成对极耳112中的一个极耳112连接的第一连接段1131和与所述成对极耳112中的另一个极耳112连接的第二连接段1132，所述第一连接段1131与所述第二连接段1132相互分离，所述第一连接段1131具有第一断口fr1，所述第二连接段1132具有第二断口fr2，所述第一断口fr1与所述第二断口fr2能够至少部分地相互拼合。
对于极片加工过程来说，当对极片进行传输、纠偏、张紧、卷绕等加工工艺时，通过处于连接状态的多桥式连接部113m使相邻成对极耳112保持一定的整体性来抵挡弯曲，而在对极耳112进行抚平之前或抚平时，断开多桥式连接部113m可以改善极耳交叠的有序性。当断开多桥式连接部113m时，能够使各个连接桥断开后的第一连接段1131和第二连接段1132分别形成第一断口fr1和第二断口fr2，这种断开连接桥所形成的第一断口fr1和第二断口fr2能够至少部分地相互拼合。这样通过多个连接桥的形式的连接部提升相邻成对极耳的整体性，并通过断开全部连接桥来相邻极耳被抚平时或被抚平后能够有序地交叠，从而更好地兼顾抵抗极耳弯曲和抚平极耳的有序交叠。
图13-图15分别是根据本公开电极组件的一些实施例中极片采用不同设置形式的连接部的示意图。
参考图8、图9、图13、图14和图15，在一些实施例中，在所述卷绕方向wd上，所述多个极耳112中各个极耳112的一侧或两侧与相邻极耳112之间通过连接部113 连接。通过使所有极耳112都通过连接部113与在一侧或两侧相邻的极耳112连接，可以提高各个极耳112的整体性，降低极耳112在抚平前发生过度弯曲的可能性，从而降低进一步造成的不良率损失、短路或热失控风险。
参考图13和图14，所述多个极耳112包括沿所述卷绕方向wd排布的多个极耳组。图13和图14均示意了三个极耳组G1、G2和G3，极耳组的数量具体可根据极耳的数量、极片长度以及连接部的数量等因素确定。每个极耳组包括连续相邻且通过所述连接部113连接的多个极耳112，相邻极耳组之间不通过所述连接部113连接。这里极耳组是根据连接部在相邻极耳间的连续设置划分的，相邻极耳组之间不通过连接部连接。
在图13中，各个极耳组包括的连接部113的数量相等。例如在图13中，每个极耳组中均包括三个连接部113。这样有利于简化极耳112的加工工艺，降低加工难度。
在图14中，多个极耳组中至少两个极耳组包括的连接部113的数量不相等。例如在图14中，极耳组G1包括两个连接部113，极耳组G2包括三个连接部113，极耳组G3包括四个连接部113。各个极耳组包括的连接部113的数量可以根据电极组件1的尺寸、形态以及工作环境等多方面因素来进行设计，以满足更多方面的需要，提高电极组件1的适应性。
考虑到卷绕形式的电极组件1中越靠近卷绕起始端WS的极片卷绕圈110的曲率越大，相邻极耳112交叠程度越高，未断开的连接部越容易造成该位置的极耳皱褶，而靠近卷绕终止端WE的极片卷绕圈110的曲率较小，相邻极耳112交叠程度降低，未断开的连接部则相对不容易造成该位置的极耳皱褶。
因此，参考图14，在一些实施例中，各个极耳组G1，G2，G3包括的连接部113的数量从所述集流体基材111的卷绕起始端WS到所述集流体基材111的卷绕终止端WE增加。这样可以通过较少的连接部降低靠近卷绕起始端WS的极耳皱褶发生的几率，并使靠近卷绕终止端WE的极耳能够通过更多的连接部来获得极耳间更高的整体性。
参考图10，在一些实施例中，所述连接部113位于所述成对极耳112的根部112r远离所述集流体基材111的一侧，所述连接部113与所述成对极耳112的根部112r之间包括沿所述集流体基材111的厚度方向d3贯通的镂空区域CO。镂空区域CO的形状可以为矩形、梯形或其他多边形。
当采用激光裁切极耳112的方式时，相邻的成对极耳112之间的部分材料被消除， 连接部113能够与相邻极耳112和极耳112的根部112r围出镂空区域CO，这种结构可在连接部113的位置形成应力集中，从而有利于连接部113的断开，进而有助于提高处于断开状态的连接部113A的数量。
参考图14，在一些实施例中，所述连接部113位于所述成对极耳112的根部112r和顶部112t之间的位置，且所述连接部113相对于所述成对极耳112的顶部112t朝靠近所述成对极耳112的根部112r的方向凹入。通过使连接部113相对于成对极耳112的顶部112t朝向极耳112根部112r凹入，可以使连接部113更容易断开，有助于提高处于断开状态的连接部113A的数量。在另一些实施例中，所述连接部113也可以与成对极耳的顶部112t平齐，即图13所示的结构。
参考图15，在一些实施例中，所述连接部113在所述集流体基材111的宽度方向d2上的至少一侧具有折线边缘1134。在图15中，连接部113在所述集流体基材111的宽度方向d2上的两侧均设有折线边缘1134。在另一些实施例中，连接部113在所述集流体基材111的宽度方向d2上靠近根部112r的一侧或远离根部112r的一侧设有折线边缘1134。
具有折线边缘1134的连接部113可形成应力集中的易断部位，从而使连接部113更容易断开，有助于提高处于断开状态的连接部113A的数量，从而使更多的极耳有序交叠，改善极耳堆叠结构的均匀性，进一步地提升焊接质量。
图16是根据本公开电极组件的一些实施例中极片的极耳设置加强结构的示意图。
参考图16，在一些实施例中，通过所述连接部113连接的成对极耳112中的任一极耳112具有加强结构。通过加强结构提高极耳112的强度，在断开连接部113时使极耳112不容易发生断裂，相应地也使得连接部113更容易断开。
可选地，所述加强结构包括设置于所述极耳112表面且沿所述集流体基材111的宽度方向d2延伸的加强筋112s。每个极耳112的表面可以设置一条加强筋112s，也可以多条加强筋112s。通过在极耳表面设置沿集流体基材111的宽度方向d2延伸的加强筋112s，可以有效地提高极耳112的强度，降低极耳112断裂的风险，提高连接部113的易断程度。
图17是根据本公开电极组件的一些实施例中极片的多个相邻极耳之间设置连接部的示意图。图18是图17中AA截面的示意图。
参考图17和图18，在一些实施例中，所述连接部113包括减薄区域1133，在与所述集流体基材111的厚度方向d3上，所述减薄区域1133的厚度t1低于所述成对 极耳112中任一极耳112的厚度t2。连接部113的减薄区域1133由于厚度相比于极耳112较低，因此易于断开，有助于提高处于断开状态的连接部113A的数量。
在图18中，连接部113可以与成对极耳112一体制成，连接部113以及成对极耳112可通过对集流体基材111未被活性物质层114覆盖的区域进行激光裁切形成。连接部113可以整体为减薄区域1133，也可以一部分为减薄区域1133。
在另一些实施例中，连接部113也可以独立于极耳112制成，相应地可采用与极耳112相同或不同的材料制成。连接部113可以与极耳112固定连接，例如焊接或粘接。
图19是根据本公开电极组件的另一些实施例中极片的多个相邻极耳之间设置连接部的示意图。图20是图19中BB截面的示意图。
参考图19和图20，采用与极耳不同材料的连接部113连接在相邻的成对极耳112之间。在材料上，连接部113的材料的拉伸强度可低于所述成对极耳112中任一极耳112的材料的拉伸强度。通过使连接部113的材料的拉伸强度低于成对极耳112中任一极耳112的材料的拉伸强度，从而在断开连接部113的过程中通过施加对极耳112部分的拉力即可使连接部113在受拉作用断开，节省分别对各个连接部113进行切断操作的时间，提高加工效率。
材料的拉伸强度具有本领域公知的含义，可以采用本领域已知的方法进行测量。例如测试可采用以下方式进行：取一定长度的材料试样，测量材料试样的截面积为S0；试验机以50mm/min的速度对材料试样进行拉伸，直至拉断；由测力度盘或拉伸曲线上读出最大负荷Fb；按下式计算该材料试样的拉伸强度σb：σb＝Fb/S0。
基于前述电极组件的各实施例，参考图4，本公开实施例提供了一种电池单体2，包括前述任一实施例的电极组件1。采用前述电极组件的电池单体可有效地提升使用安全性。
参考图4和图5，在一些实施例中，电池单体2还包括：外壳21、电极端子22和导电件23。外壳21具有容纳所述电极组件1的腔室。电极端子22设置在所述外壳21的壁部。导电件23与所述电极组件1中多个极耳112在卷绕结构10的端部堆叠成的极耳堆叠结构焊接，并与所述电极端子22电连接。
通过导电件23与设置在外壳21壁部的电极端子22电连接，并与电极组件1在卷绕结构10端部堆叠的多个极耳112进行焊接，堆叠的多层极耳堆叠结构具有更高的厚度，在与导电件23焊接时不容易被焊穿，以免焊接时烫伤电极组件1中隔膜或 极片等结构导致短路等风险，从而在改善焊接区域的焊接质量的同时，降低电池单体的短路风险，提高使用安全性。
可选地，所述外壳21包括壳体211和端盖212，所述壳体211的一端具有开口211c，所述端盖212盖合于所述开口211c，所述壳体211包括侧壁211a和底壁211b，所述侧壁211a环绕于所述电极组件1的外侧，所述底壁211b与所述开口211c相对设置，所述外壳21的壁部为所述端盖212或所述底壁211b。
导电件23与设置在端盖212或壳体211的底壁211b上的电极端子22电连接，并与电极组件1的极耳堆叠结构焊接，在对焊接区域的焊接质量的改善的同时，降低电池单体的短路风险，提高使用安全性。
基于前述电池单体的各实施例，参考图2，本公开实施例提供了一种电池3，包括前述任一实施例的电池单体2。采用前述电池单体的电池可有效地提升使用安全性。
基于前述电池的各实施例，参考图1，本公开实施例提供了一种用电装置，包括前述任一实施例的电池3。采用前述电池的用电装置可有效地提升使用安全性。
图21是根据本公开电极组件的制造方法的一些实施例的流程示意图。
参考图21，本公开实施例提供了一种电极组件1的制造方法。这里的电极组件可以为前述各实施例的电极组件1。电极组件1的制造方法包括步骤S10、步骤S20和步骤S30。
在步骤S10中，提供多个极片11和隔离件12。所述多个极片11中的至少一个包括：集流体基材111、多个极耳112和连接部113。所述集流体基材111的表面设有活性物质层114，所述多个极耳112连接在所述集流体基材111沿所述集流体基材111的长度方向d1延伸的至少一个侧边上，多个极耳112沿所述集流体基材111的长度方向d1间隔排布，并且相邻两个极耳112形成一组成对极耳112，所述连接部113连接在一组或多组所述成对极耳112中的所述相邻两个极耳112之间，且处于连接状态。
在步骤S20中，将所述隔离件12设置在所述多个极片11中极性相反的相邻两个极片11之间，并将所述多个极片11和所述隔离件12沿卷绕方向wd卷绕成卷绕结构10。
在步骤S30中，使连接一组或多组所述成对极耳112的连接部113中的一部分或全部断开，并对所述多个极耳112进行折弯，以使所述多个极耳112在所述卷绕结构10的端部堆叠。连接部113的断开操作可以在折弯多个极耳112之前，也可以在折弯多个极耳112时进行。
通过连接在多个极耳中沿所述第一方向相邻的一组或多组成对极耳之间且处于连接状态的连接部可以在极片进行传输、纠偏、张紧、卷绕等加工工艺中使极耳保持一定的整体性来抵抗弯曲，降低过度弯曲带来的弯折或插入到活性物质层的风险，通过将连接部的一部分或全部断开，并对极耳进行折弯抚平，折弯抚平的相邻极耳在断开连接部后能够被有序的交叠，从而有利于形成更致密的极耳交叠结构，改善焊接质量。
在一些具体的实施例中，如图7至图9所示，电池单体2包括：电极组件1、外壳21、电极端子22和导电件23。外壳21具有容纳所述电极组件1的腔室。外壳21包括壳体211和端盖212，所述壳体211的一端具有开口211c，所述端盖212盖合于所述开口211c，所述壳体211包括侧壁211a和底壁211b，所述侧壁211a环绕于所述电极组件1的外侧，所述底壁211b与所述开口211c相对设置。
电极端子22设置在所述外壳21的底壁211b。导电件23与所述电极组件1中多个极耳112在卷绕结构10的端部堆叠成的极耳堆叠结构焊接，并与所述电极端子22电连接。
电极组件1包括正极极片11a、负极极片11b和位于正极极片11a和负极极片11b之间的隔离件12。正极极片11a和负极极片11b交替排列，并与隔离件12卷绕成卷绕结构10。正极极片11a和负极极片11b均可包括集流体基材111、多个极耳112和连接部113。集流体基材111的表面设有活性物质层114。
多个极耳112连接在所述集流体基材111沿卷绕方向wd延伸的一个侧边上，并沿所述卷绕方向wd间隔排布。相邻两个极耳112形成一组成对极耳112。连接部113连接在一组或多组所述成对极耳112中的所述相邻两个极耳112之间。
连接一组或多组所述成对极耳112的所有连接部113包括处于断开状态的连接部113A和处于连接状态的连接部113B。连接一组或多组所述成对极耳112的所有连接部113为单桥式连接部113s，所述处于断开状态的单桥式连接部113s与所述成对极耳112中的一个极耳112连接的第一连接段1131和与所述成对极耳112中的另一个极耳112连接的第二连接段1132，所述第一连接段1131与所述第二连接段1132相互分离，所述第一连接段1131具有第一断口fr1，所述第二连接段1132具有第二断口fr2，所述第一断口fr1与所述第二断口fr2能够至少部分地相互拼合。
在所述卷绕方向wd上，所述多个极耳112中各个极耳112的一侧或两侧与相邻极耳112之间通过连接部113连接。所述连接部113位于所述成对极耳112的根部 112r和顶部112t之间的位置，且所述连接部113相对于所述成对极耳112的顶部112t朝靠近所述成对极耳112的根部112r的方向凹入。
所述多个极耳112包括沿所述卷绕方向wd排布的多个极耳组，各个极耳组包括的连接部113的数量从所述集流体基材111的卷绕起始端WS到所述集流体基材111的卷绕终止端WE增加。
虽然已经参考优选实施例对本公开进行了描述，但在不脱离本公开的范围的情况下，可以对其进行各种改进并且可以用等效物替换其中的部件。尤其是，只要不存在结构冲突，各个实施例中所提到的各项技术特征均可以任意方式组合起来。本公开并不局限于文中公开的特定实施例，而是包括落入权利要求的范围内的所有技术方案。

Claims (30)

  1. 一种电极组件(1)，包括多个极片(11)和位于所述多个极片(11)中极性相反的相邻两个极片(11)之间的隔离件(12)，所述多个极片(11)和所述隔离件(12)沿卷绕方向(wd)卷绕成卷绕结构(10)；所述多个极片(11)中的至少一个包括：
    集流体基材(111)，所述集流体基材的表面设有活性物质层(114)；
    多个极耳(112)，连接在所述集流体基材(111)沿所述卷绕方向(wd)延伸的至少一个侧边上，所述多个极耳(112)沿所述卷绕方向(wd)间隔排布，并且相邻两个极耳(112)形成一组成对极耳(112)；和
    连接部(113)，连接在一组或多组所述成对极耳(112)中的所述相邻两个极耳(112)之间。
  2. 根据权利要求1所述的电极组件(1)，其中连接一组或多组所述成对极耳(112)的所有连接部(113)中的至少一个为包括单个连接桥的单桥式连接部(113s)和包括沿所述集流体基材(111)的宽度方向(d2)间隔排布的多个连接桥的多桥式连接部(113m)中的一种。
  3. 根据权利要求1或2所述的电极组件(1)，其中连接一组或多组所述成对极耳(112)的所有连接部(113)包括处于断开状态的连接部(113A)。
  4. 根据权利要求3所述的电极组件(1)，其中所述连接一组或多组所述成对极耳(112)的所有连接部(113)中的至少一个为包括单个连接桥的单桥式连接部(113s)，处于断开状态的单桥式连接部(113s)包括与所述成对极耳(112)中的一个极耳(112)连接的第一连接段(1131)和与所述成对极耳(112)中的另一个极耳(112)连接的第二连接段(1132)，所述第一连接段(1131)与所述第二连接段(1132)相互分离，所述第一连接段(1131)具有第一断口(fr1)，所述第二连接段(1132)具有第二断口(fr2)，所述第一断口(fr1)与所述第二断口(fr2)能够至少部分地相互拼合。
  5. 根据权利要求3所述的电极组件(1)，其中所述连接一组或多组所述成对极耳(112)的所有连接部(113)中的至少一个为包括沿所述集流体基材(111)的宽度方向(d2)间隔排布的多个连接桥的多桥式连接部(113m)，处于断开状态的多桥式连接部(113m)中的每个连接桥均包括与所述成对极耳(112)中的一个极耳(112)连接的第一连接段(1131)和与所述成对极耳(112)中的另一个极耳(112)连接的第二连接段(1132)，所述第一连接段(1131)与所述第二连接段(1132)相互分离， 所述第一连接段(1131)具有第一断口(fr1)，所述第二连接段(1132)具有第二断口(fr2)，所述第一断口(fr1)与所述第二断口(fr2)能够至少部分地相互拼合。
  6. 根据权利要求2～5任一所述的电极组件(1)，其中连接一组或多组所述成对极耳(112)的所有连接部(113)包括处于连接状态的连接部(113B)。
  7. 根据权利要求6所述的电极组件(1)，其中所述处于连接状态的连接部(113B)的数量定义为n1，所有连接一组或多组所述成对极耳(112)的所有连接部(113)的数量定义为n0，n1/n0满足：n1/n0≤1/2。
  8. 根据权利要求7所述的电极组件(1)，其中n1/n0满足：n1/n0≤1/4。
  9. 根据权利要求6～8任一所述的电极组件(1)，其中在连接一组或多组所述成对极耳(112)的所有连接部(113)中，所述处于连接状态的连接部(113B)在所述卷绕方向(wd)上连续相邻的数量定义为nc，nc满足：nc≤4。
  10. 根据权利要求9所述的电极组件(1)，其中nc满足：nc≤2。
  11. 根据权利要求6～10任一所述的电极组件(1)，其中在与每层极片卷绕圈(110)连接的多个极耳(112)中，通过所述处于连接状态的连接部(113B)分别连接的连续相邻多组所述成对极耳(112)在该层极片卷绕圈(110)对应的角度范围定义为Ri，i为极片卷绕圈(110)所在层的层数，i＝1～N，N为极片卷绕圈的总层数，Ri满足：Ri≤60°。
  12. 根据权利要求11所述的电极组件(1)，其中Ri满足：Ri≤30°。
  13. 根据权利要求2～5任一所述的电极组件(1)，其中连接一组或多组所述成对极耳(112)的所有连接部(113)均为处于断开状态的连接部(113A)。
  14. 权利要求1～13任一所述的电极组件(1)，其中在所述卷绕方向(wd)上，所述多个极耳(112)中各个极耳(112)的一侧或两侧与相邻极耳(112)之间通过连接部(113)连接。
  15. 根据权利要求1～14任一所述的电极组件(1)，其中所述多个极耳(112)包括沿所述卷绕方向(wd)排布的多个极耳组(G1，G2，G3)，每个极耳组(G1，G2，G3)包括连续相邻且通过所述连接部(113)连接的多个极耳(112)，相邻极耳组(G1，G2，G3)之间不通过所述连接部(113)连接，各个极耳组(G1，G2，G3)包括的连接部(113)的数量相等。
  16. 根据权利要求1～14任一所述的电极组件(1)，其中所述多个极耳(112)包括沿所述卷绕方向(wd)排布的多个极耳组(G1，G2，G3)，每个极耳组(G1，G2， G3)包括连续相邻且通过所述连接部(113)连接的多个极耳(112)，相邻极耳组(G1，G2，G3)之间不通过所述连接部(113)连接，所述多个极耳组(G1，G2，G3)中至少两个极耳组(G1，G2，G3)包括的连接部(113)的数量不相等。
  17. 根据权利要求16所述的电极组件(1)，其中各个极耳组(G1，G2，G3)包括的连接部(113)的数量从所述集流体基材(111)的卷绕起始端(WS)到所述集流体基材(111)的卷绕终止端(WE)增加。
  18. 根据权利要求1～17任一所述的电极组件(1)，其中所述连接部(113)位于所述成对极耳(112)的根部(112r)远离所述集流体基材(111)的一侧，所述连接部(113)与所述成对极耳(112)的根部(112r)之间包括沿所述集流体基材(111)的厚度方向贯通的镂空区域(CO)。
  19. 根据权利要求1～18任一所述的电极组件(1)，其中所述连接部(113)位于所述成对极耳(112)的根部(112r)和顶部(112t)之间的位置，且所述连接部(113)相对于所述成对极耳(112)的顶部(112t)朝靠近所述成对极耳(112)的根部(112r)的方向凹入。
  20. 根据权利要求19所述的电极组件(1)，其中所述连接部(113)在所述集流体基材(111)的厚度方向(d2)上的至少一侧具有折线边缘(1134)。
  21. 根据权利要求1～20任一所述的电极组件(1)，其中所述连接部(113)包括减薄区域(1133)，在所述集流体基材(111)的厚度方向(d3)上，所述减薄区域(1133)的厚度t1低于所述成对极耳(112)中任一极耳(112)的厚度t2。
  22. 根据权利要求1～21任一所述的电极组件(1)，其中通过所述连接部(113)连接的成对极耳(112)中的任一极耳(112)具有加强结构。
  23. 根据权利要求22所述的电极组件(1)，其中所述加强结构包括设置于所述极耳(112)表面且沿所述集流体基材(111)的宽度方向(d2)延伸的加强筋(112s)。
  24. 根据权利要求1～23任一所述的电极组件(1)，其中，所述连接部(113)的材料的拉伸强度低于所述成对极耳(112)中任一极耳(112)的材料的拉伸强度。
  25. 一种电池单体(2)，包括：
    权利要求1～24任一所述的电极组件(1)。
  26. 根据权利要求25所述的电池单体(2)，还包括：
    外壳(21)，具有容纳所述电极组件(1)的腔室；
    电极端子(22)，设置在所述外壳(21)的壁部；和
    导电件(23)，与所述电极组件(1)中多个极耳(112)在卷绕结构(10)的端部堆叠成的极耳堆叠结构焊接，并与所述电极端子(22)电连接。
  27. 根据权利要求26所述的电池单体(2)，其中所述外壳(21)包括壳体(211)和端盖(212)，所述壳体(211)的一端具有开口(211c)，所述端盖(212)盖合于所述开口(211c)，所述壳体(211)包括侧壁(211a)和底壁(211b)，所述侧壁(211a)环绕于所述电极组件(1)的外侧，所述底壁(211b)与所述开口(211c)相对设置，所述外壳(21)的壁部为所述端盖(212)或所述底壁(211b)。
  28. 一种电池(3)，包括：
    权利要求25～27任一所述的电池单体(2)。
  29. 一种用电装置，包括：
    权利要求28所述的电池(3)。
  30. 一种电极组件(1)的制造方法，包括：
    提供多个极片(11)和隔离件(12)，其中所述多个极片(11)中的至少一个包括：集流体基材(111)、多个极耳(112)和连接部(113)，所述集流体基材(111)的表面设有活性物质层(114)，所述多个极耳(112)连接在所述集流体基材(111)沿所述集流体基材(111)的长度方向(d1)延伸的至少一个侧边上，所述多个极耳(112)沿所述集流体基材(111)的长度方向(d1)间隔排布，并且相邻两个极耳(112)形成一组成对极耳(112)，所述连接部(113)连接在一组或多组所述成对极耳(112)中的所述相邻两个极耳(112)之间，且处于连接状态；
    将所述隔离件(12)设置在所述多个极片(11)中极性相反的相邻两个极片(11)之间，并将所述多个极片(11)和所述隔离件(12)沿卷绕方向(wd)卷绕成卷绕结构(10)；
    使连接一组或多组所述成对极耳(112)的连接部(113)中的一部分或全部断开，并对所述多个极耳(112)进行折弯，以使所述多个极耳在所述卷绕结构的端部堆叠。
PCT/CN2024/073974 2023-05-23 2024-01-25 电池单体、电池、用电装置、电极组件及其制造方法 Ceased WO2024239702A1 (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202310584283.8A CN118198522A (zh) 2023-05-23 2023-05-23 电池单体、电池、用电装置、电极组件及其制造方法
CN202310584283.8 2023-05-23

Publications (1)

Publication Number Publication Date
WO2024239702A1 true WO2024239702A1 (zh) 2024-11-28

Family

ID=91414513

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2024/073974 Ceased WO2024239702A1 (zh) 2023-05-23 2024-01-25 电池单体、电池、用电装置、电极组件及其制造方法

Country Status (2)

Country Link
CN (1) CN118198522A (zh)
WO (1) WO2024239702A1 (zh)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN120325737A (zh) * 2025-06-20 2025-07-18 宁德时代新能源科技股份有限公司 极耳抚平装置以及电池制造设备
CN121584046A (zh) * 2026-01-27 2026-02-27 宁德时代新能源科技股份有限公司 一种电池单体、电池装置、用电装置和制造方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2026117907A1 (zh) * 2024-12-02 2026-06-11 宁德时代新能源科技股份有限公司 圆柱电池单体、电池装置以及用电装置
WO2026152468A1 (zh) * 2025-01-20 2026-07-23 宁德时代新能源科技股份有限公司 圆柱电池单体、电池装置及用电装置

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012190738A (ja) * 2011-03-14 2012-10-04 Panasonic Corp リチウム二次電池
CN115064843A (zh) * 2022-07-20 2022-09-16 宁德新能源科技有限公司 电池及其用电装置
CN218005176U (zh) * 2022-06-15 2022-12-09 江苏正力新能电池技术有限公司 一种圆柱电池极片及圆柱电池
CN115764181A (zh) * 2022-09-21 2023-03-07 江苏时代新能源科技有限公司 电池单体、电池、用电装置以及焊接设备
CN218602472U (zh) * 2022-11-29 2023-03-10 蜂巢能源科技股份有限公司 极片及电池极组
WO2023035990A1 (zh) * 2021-09-07 2023-03-16 欣旺达电动汽车电池有限公司 单体电池、电池模组及电池包
CN218769985U (zh) * 2022-09-06 2023-03-28 宁德时代新能源科技股份有限公司 电极组件、电池单体、电池、用电装置和极耳整形装置

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012190738A (ja) * 2011-03-14 2012-10-04 Panasonic Corp リチウム二次電池
WO2023035990A1 (zh) * 2021-09-07 2023-03-16 欣旺达电动汽车电池有限公司 单体电池、电池模组及电池包
CN218005176U (zh) * 2022-06-15 2022-12-09 江苏正力新能电池技术有限公司 一种圆柱电池极片及圆柱电池
CN115064843A (zh) * 2022-07-20 2022-09-16 宁德新能源科技有限公司 电池及其用电装置
CN218769985U (zh) * 2022-09-06 2023-03-28 宁德时代新能源科技股份有限公司 电极组件、电池单体、电池、用电装置和极耳整形装置
CN115764181A (zh) * 2022-09-21 2023-03-07 江苏时代新能源科技有限公司 电池单体、电池、用电装置以及焊接设备
CN218602472U (zh) * 2022-11-29 2023-03-10 蜂巢能源科技股份有限公司 极片及电池极组

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN120325737A (zh) * 2025-06-20 2025-07-18 宁德时代新能源科技股份有限公司 极耳抚平装置以及电池制造设备
CN121584046A (zh) * 2026-01-27 2026-02-27 宁德时代新能源科技股份有限公司 一种电池单体、电池装置、用电装置和制造方法

Also Published As

Publication number Publication date
CN118198522A (zh) 2024-06-14

Similar Documents

Publication Publication Date Title
US20250300312A1 (en) Battery cell, battery, and electrical device
US20260045607A1 (en) Battery cell, battery, and electric device
EP4589717A1 (en) Battery cell, battery and electric device
WO2025043904A1 (zh) 电池单体、电池及用电设备
CN118198522A (zh) 电池单体、电池、用电装置、电极组件及其制造方法
US20250273747A1 (en) Battery cell, battery, and electrical device
CN220233402U (zh) 电池单体、电池及用电设备
CN219873812U (zh) 壳体、电池单体、电池及用电设备
US20250364675A1 (en) Battery cell, battery, and power consuming device
US20260018712A1 (en) Battery cell case and manufacturing method therefor, battery cell, battery, and electric apparatus
US20250293313A1 (en) Electrode assembly, battery cell, battery, and electric apparatus
US20250343332A1 (en) Battery cell, battery, and electric device
US20250279535A1 (en) Battery cell, battery, and electrical device
WO2024178623A1 (zh) 电池单体、电池及用电设备
US20250309476A1 (en) Battery cell, battery, and power consuming device
CN118693453A (zh) 电池单体、电池及用电设备
CN221632728U (zh) 电池单体、电池、用电装置
WO2025107321A1 (zh) 电池单体、电池、用电装置及电池单体的制备方法
US20260031472A1 (en) Battery cell, battery, and electrical apparatus
US20250183469A1 (en) Case, battery cell, battery and powered device
CN120709611B (zh) 电池单体、电池装置和用电装置
US20260045627A1 (en) Battery cell, battery, and electrical apparatus
EP4668470A1 (en) Battery cell, battery, and electric device
WO2025145352A1 (zh) 电池单体、电池及用电设备
WO2025138238A1 (zh) 电池单体、电池及用电设备

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 24809952

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 24809952

Country of ref document: EP

Kind code of ref document: A1