WO2025236397A1 - 电池单体、电池和用电设备 - Google Patents

电池单体、电池和用电设备

Info

Publication number
WO2025236397A1
WO2025236397A1 PCT/CN2024/105744 CN2024105744W WO2025236397A1 WO 2025236397 A1 WO2025236397 A1 WO 2025236397A1 CN 2024105744 W CN2024105744 W CN 2024105744W WO 2025236397 A1 WO2025236397 A1 WO 2025236397A1
Authority
WO
WIPO (PCT)
Prior art keywords
adhesive
electrode
region
edge
width direction
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.)
Pending
Application number
PCT/CN2024/105744
Other languages
English (en)
French (fr)
Inventor
张小畏
吴翔
王泽江
温裕乾
唐鸣浩
张盛武
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 WO2025236397A1 publication Critical patent/WO2025236397A1/zh
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/172—Arrangements of electric connectors penetrating the 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

Definitions

  • This application relates to the field of battery technology, and more specifically, to a battery cell, a battery, and an electrical device.
  • Batteries are widely used in portable electronic devices, electric vehicles, power tools, drones, energy storage devices, and other fields.
  • the reliability of battery components is a crucial issue. Therefore, improving battery reliability is a pressing technical problem that needs to be solved in battery technology.
  • This application provides a battery cell, a battery, and an electrical device that can improve battery reliability.
  • a battery cell including a housing and an electrode assembly: the electrode assembly is disposed within the housing, the electrode assembly includes a first electrode sheet and a first insulating member, the first electrode sheet having a first end in the length direction; the first insulating member includes a first adhesive tape and a second adhesive tape, the first adhesive tape and the second adhesive tape being respectively adhered to two sides of the first end in the thickness direction; along the length direction of the first electrode sheet, both the first adhesive tape and the second adhesive tape extend beyond the first end, and the portions extending beyond the first end are adhered to each other;
  • the first adhesive tape includes a first adhesive region coated with an adhesive layer and a first non-adhesive region uncoated with an adhesive layer. Along the width direction of the first electrode, the first non-adhesive region is located at at least one end of the first adhesive tape.
  • the first non-adhesive region is located at at least one end of the first adhesive tape along the width direction of the first electrode sheet, even if the first adhesive tape and the second adhesive tape are misaligned in the width direction of the first electrode sheet due to bonding process tolerances, the first adhesive tape will not leak adhesive at at least one end in the width direction of the first electrode sheet; instead, only the non-adhesive first non-adhesive region will be exposed. This reduces the probability of adhesive leakage from the first insulating component and also reduces problems such as roller sticking, delamination, tape breakage, and even electrode sheet damage caused by adhesive leakage, thereby improving battery reliability.
  • the first adhesive tape includes two first non-adhesive regions along the width direction of the first electrode sheet, with the two first non-adhesive regions located at both ends of the first adhesive tape and the first adhesive region located between the two first non-adhesive regions.
  • the second adhesive tape includes a second adhesive region coated with an adhesive layer and a second non-adhesive region uncoated with an adhesive layer, wherein the second non-adhesive region is located at at least one end of the second adhesive tape along the width direction of the first electrode sheet.
  • the second adhesive tape includes two second non-adhesive regions along the width direction of the second electrode sheet.
  • the two second non-adhesive regions are respectively located at both ends of the second adhesive tape, and the second adhesive region is located between the two second non-adhesive regions.
  • the first electrode sheet along the width direction of the first electrode sheet, includes a first functional region coated with an active material layer and a first empty foil region not coated with an active material layer; along the width direction of the first electrode sheet, the first functional region has a first edge and a second edge; along the width direction of the first electrode sheet, the first adhesive region extends beyond at least one of the first edge and the second edge, and/or, the first... The two viscous regions extend beyond at least one of the first edge and the second edge.
  • the first adhesive area can not only be bonded to the first functional area, but the part of the first adhesive area that extends beyond the first functional area can also be bonded to the first empty foil area or the second adhesive paper, thereby improving the connection stability of the first adhesive paper.
  • both the first adhesive region and the second adhesive region extend beyond the first edge and the second edge.
  • the first adhesive area can not only be bonded to the first functional area, but also the portion of the first adhesive area that extends beyond the first functional area can be bonded to the first empty foil area or the second adhesive tape, thereby improving the connection stability of the first adhesive tape;
  • the second adhesive area can not only be bonded to the first functional area, but also the portion of the second adhesive area that extends beyond the first functional area can be bonded to the empty foil area or the first adhesive tape, thereby improving the connection stability of the second adhesive tape.
  • the first electrode sheet along the width direction of the first electrode sheet, includes a first functional area coated with an active material layer and a first empty foil area not coated with an active material layer; along the width direction of the first electrode sheet, the first functional area has a first edge and a second edge, and neither the first adhesive area nor the second adhesive area extends beyond the first edge and the second edge.
  • the obstruction of the first end by the first insulating component is reduced, which at least to some extent improves the energy density of the battery cell.
  • the first empty foil area is connected to the second edge, and the first empty foil area has a third edge away from the first functional area; along the width direction of the first electrode sheet, the first adhesive paper extends beyond at least one of the first edge and the third edge, and/or, the second adhesive paper extends beyond at least one of the first edge and the third edge.
  • the first adhesive tape extends beyond the first edge or the third edge, or the first adhesive tape extends beyond both the first edge and the third edge.
  • the second adhesive tape extends beyond the first edge or the third edge, or the second adhesive tape extends beyond both the first edge and the third edge.
  • the first end has a fourth edge, and along the length direction of the first electrode sheet, both the first adhesive paper and the second adhesive paper extend beyond the fourth edge; along the thickness direction of the first electrode sheet, the connection between the third edge and the fourth edge is located between the first non-adhesive region and the second non-adhesive region.
  • the corners of the first empty foil area (the junction of the third edge and the fourth edge) can be fixed and supported by the first non-adhesive area and the second non-adhesive area, which effectively reduces the probability of the first electrode sheet folding and deforming.
  • the size of the first non-adhesive region along the width direction of the first electrode is L0 , which satisfies: 1mm ⁇ L0 ⁇ 6mm .
  • the width of the first non-adhesive region is sufficient and the adhesive layer of the first adhesive tape will not be exposed; on the other hand, it also ensures that the size of the first non-adhesive region is not too large, which would result in the size of the first adhesive region being insufficient, thereby affecting the adhesive performance of the first adhesive tape.
  • the maximum thickness of the first adhesive tape is t1
  • the maximum thickness of the second adhesive tape is t2
  • the maximum thickness of the first end is t3 , satisfying: t1 ⁇ t3 , t2 ⁇ t3 .
  • the maximum thickness of the first adhesive tape is less than the maximum thickness of the first end, even if a step is formed between the first adhesive tape and the side of the first end in the thickness direction, this step is smaller than the step height between the first end and the adjacent electrode area when the first insulating member is not provided. This reduces stress concentration caused by the step and decreases the risk of the first electrode breaking due to stress concentration.
  • the maximum thickness of the second adhesive tape is less than the maximum thickness of the first end, even if a step is formed between the second adhesive tape and the side of the first end in the thickness direction, this step is smaller than the step height between the first end and the adjacent electrode area when the first insulating member is not provided. This reduces stress concentration caused by the step and decreases the risk of the first electrode breaking due to stress concentration.
  • t1 + t2 ⁇ t3 t1 + t2 ⁇ t3 .
  • the step height is small and always less than the step height between the first end and the adjacent electrode area when the first insulating member is not provided. This reduces the stress concentration caused by the step and reduces the risk of the first electrode breaking due to stress concentration.
  • the step height between the first adhesive strip and the first end is further reduced, and the step height between the second adhesive strip and the first end is also reduced. This reduces stress concentration caused by the step, thus decreasing the risk of the first electrode sheet breaking.
  • the projection of the first insulating member and the projection of the first end have a first overlapping area
  • the maximum size of the first overlapping area is L1 , which satisfies: L1 ⁇ 100mm.
  • the first insulating component is always connected to the first end, at least covering a part of the first end, to block burrs and reduce the probability of burrs piercing the separator; on the other hand, the first overlapping area is not too large, and the first insulating component does not cover too much area of the first electrode, thus having a smaller impact on the energy density of the battery cell.
  • the first insulating component is always connected to the first end, at least covering a part of the first end, to block burrs and further reduce the probability of burrs piercing the separator; on the other hand, the first overlapping area is not too large, and the first insulating component does not cover too much area of the first electrode, thereby further taking into account the energy density of the battery cell.
  • the first electrode has two first ends, which are respectively located at both ends of the first electrode in the length direction, and each first end is provided with the first insulating member.
  • both ends of the first electrode in the length direction can be protected by the first insulating component, which effectively blocks the burrs at both ends of the first electrode in the length direction, reduces the risk of burrs piercing the separator and causing a short circuit between the positive and negative electrodes, and improves the reliability of the battery.
  • the electrode assembly further includes: a second electrode sheet, which is one of a positive electrode sheet and a negative electrode sheet, and the first electrode sheet is one of the positive electrode sheet and the negative electrode sheet, wherein the second electrode sheet has a second end in the length direction; a second insulating member, including a third adhesive tape and a fourth adhesive tape, wherein the third adhesive tape and the fourth adhesive tape are respectively adhered to two sides of the second end in the thickness direction; along the length direction of the second electrode sheet, both the third adhesive tape and the fourth adhesive tape extend beyond the second end, and the portions extending beyond the second end are adhered to each other;
  • the third adhesive paper includes a third adhesive region coated with an adhesive layer and a third non-adhesive region uncoated with an adhesive layer. Along the width direction of the second electrode, the third non-adhesive region is located at at least one end of the third adhesive paper.
  • the third adhesive tape and the fourth adhesive tape cannot be aligned in the width direction of the second electrode due to the bonding process, since the third non-adhesive area is disposed at at least one end of the third adhesive tape along the width direction of the second electrode, the third adhesive tape will not leak adhesive at at least one end of the second electrode in the width direction, but only the non-adhesive third non-adhesive area will be exposed.
  • the third adhesive paper includes two third non-adhesive regions.
  • the two third non-adhesive regions are respectively located at both ends of the third adhesive paper, and the third adhesive region is located between the two third non-adhesive regions.
  • the third adhesive tape will not leak adhesive at at least one end in the width direction of the second electrode; instead, only a non-adhesive third area will be exposed. This reduces the probability of adhesive leakage from the second insulating component and also reduces problems such as roller sticking, delamination, tape breakage, and even electrode damage caused by adhesive leakage, thereby improving battery reliability.
  • the fourth adhesive paper includes a fourth adhesive region coated with an adhesive layer and a fourth non-adhesive region uncoated with an adhesive layer, wherein the fourth non-adhesive region is located at at least one end of the fourth adhesive paper along the width direction of the second electrode sheet.
  • the fourth adhesive tape will not leak adhesive at at least one end in the width direction of the second electrode; instead, only a non-adhesive fourth non-adhesive area will be exposed. This reduces the probability of adhesive leakage from the second insulating component and also reduces problems such as roller sticking, delamination, tape breakage, and even electrode damage caused by adhesive leakage, thereby improving battery reliability.
  • the fourth adhesive tape includes two fourth non-adhesive regions.
  • the two fourth non-adhesive regions are respectively located at both ends of the fourth adhesive tape, and the fourth adhesive region is located between the two fourth non-adhesive regions.
  • the fourth adhesive tape will not leak adhesive at at least one end in the width direction of the second electrode; instead, only a non-adhesive fourth non-adhesive area will be exposed. This reduces the probability of adhesive leakage from the second insulating component and also reduces problems such as roller sticking, delamination, tape breakage, and even electrode damage caused by adhesive leakage, thereby improving battery reliability.
  • the second electrode has two second ends, which are respectively located at both ends of the second electrode in the length direction, and each second end is provided with a second insulating member.
  • both ends of the second electrode in the length direction can be protected by the second insulating component, which effectively blocks the burrs at both ends of the second electrode in the length direction, reduces the risk of burrs piercing the separator and causing a short circuit between the positive and negative electrodes, and improves the reliability of the battery.
  • the electrode assembly is a wound structure, and the length direction of the first electrode is the winding direction of the first electrode.
  • the first end can be the starting end of the winding of the first electrode and/or the ending end of the winding.
  • embodiments of this application provide a battery, including the battery cell described in the above embodiments.
  • embodiments of this application provide an electrical device including the battery described in the above embodiments.
  • FIG. 1 is a schematic diagram of the vehicle provided in an embodiment of this application.
  • FIG. 2 is an exploded view of the battery provided in an embodiment of this application.
  • Figure 3 is an exploded view of a single battery cell provided in an embodiment of this application.
  • FIG. 4 is a schematic diagram of an electrode assembly provided in an embodiment of this application.
  • Figure 5 is a schematic diagram of a first electrode and a second electrode after unfolding according to an embodiment of this application;
  • FIG. 6 is a schematic diagram of another electrode assembly provided in an embodiment of this application.
  • FIG. 7 is a schematic diagram of another electrode assembly provided in an embodiment of this application.
  • Figure 8 is a schematic diagram of a first end cooperating with a first insulating member according to an embodiment of this application;
  • Figure 9 is a schematic diagram of another first end cooperating with a first insulating member according to an embodiment of this application.
  • Figure 10 is a schematic diagram of another first end cooperating with a first insulating member according to an embodiment of this application;
  • Figure 11 is a schematic diagram of another first end cooperating with a first insulating member according to an embodiment of this application.
  • Figure 12 is a schematic diagram of another first end cooperating with a first insulating member according to an embodiment of this application;
  • Figure 13 is a schematic diagram of another first end cooperating with a first insulating member according to an embodiment of this application;
  • Figure 14 is a schematic diagram of another first end cooperating with a first insulating member according to an embodiment of this application;
  • Figure 15 is a schematic diagram of another first end cooperating with a first insulating member according to an embodiment of this application.
  • Figure 16 is a schematic diagram of a second end cooperating with a second insulating member according to an embodiment of this application;
  • Figure 17 is a schematic diagram of another second end cooperating with a second insulating member according to an embodiment of this application.
  • Icons Vehicle 1000, Battery 100, Controller 200, Motor 300, Housing 10, Battery Cell 20, First Sub-Housing 11, Second Sub-Housing 12, Housing 21, Electrode Assembly 22, Electrode Terminal 25, Housing 211, End Cap 212, First Insulator 223, First Adhesive Tape 223a, Second Adhesive Tape 223b, First Adhesive Area 101, First Non-Adhesive Area 102, Second Adhesive Area 103, Second Non-Adhesive Area 104, First Electrode 221, first end 221a, first functional area 105, first empty foil area 106, first edge 105a, second edge 105b, third edge 106a, fourth edge 106b, second insulating member 224, third adhesive tape 224a, fourth adhesive tape 224b, third adhesive area 107a, third non-adhesive area 107b, fourth adhesive area 108a, fourth non-adhesive area 108b, second electrode 222, second end 222a.
  • connection should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components.
  • connection can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components.
  • the term "and/or” is merely a description of the relationship between related objects, indicating that three relationships can exist.
  • a and/or B can represent: A existing alone, A and B existing simultaneously, or B existing alone.
  • the character "/" generally indicates that the preceding and following related objects have an "or" relationship.
  • multiple refers to two or more (including two), and similarly, “multiple groups” refers to two or more (including two), and “multiple pieces” refers to two or more (including two).
  • the battery can be a battery module, and when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.
  • the battery can be a battery pack, which includes a housing and individual battery cells, with the individual battery cells or battery modules housed within the housing.
  • the housing may be part of the vehicle's chassis structure.
  • a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.
  • the battery can be an energy storage device.
  • Energy storage devices include energy storage containers, energy storage cabinets, etc.
  • the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.
  • the battery cell may be, but is not limited to, lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc.
  • a single battery cell typically includes an electrode assembly.
  • the electrode assembly includes a positive electrode, a negative electrode, and a separator.
  • active ions such as lithium ions
  • the separator positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.
  • the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.
  • the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.
  • the positive electrode current collector can be a metal foil or a composite current collector.
  • a metal foil it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc.
  • Composite current collectors can include a polymer material base layer and a metal layer.
  • Composite current collectors can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).
  • the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds.
  • this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used.
  • the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.
  • the negative electrode current collector can be a metal foil or a composite current collector.
  • a metal foil it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, or made of carbon, nickel, or titanium, etc.
  • the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.
  • the negative electrode active material may be a negative electrode active material known in the art for use in batteries.
  • the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc.
  • Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys.
  • Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys.
  • this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.
  • the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical 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 particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation.
  • the separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.
  • the separator is a solid electrolyte.
  • the solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.
  • the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes.
  • the electrolyte can be liquid, gel-like, or solid. Liquid electrolytes include electrolyte salts and solvents.
  • the electrolyte salt may include 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 difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.
  • the solvent may include at least one selected from ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone.
  • the solvent may also be an ether solvent.
  • Ether solvents may include one or more selected from ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.
  • the gel electrolyte includes a polymer as the electrolyte backbone network, combined with an ionic liquid - lithium salt.
  • Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.
  • polymer solid electrolytes can be polyether (polyoxyethylene), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids-lithium salts, cellulose, etc.
  • inorganic solid electrolytes may include one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphate sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.
  • oxide solid electrolytes crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film
  • sulfide solid electrolytes crystalline lithium superconducting ion conductor (lithium germanium phosphate sulfide, silver sulfide germanium ore), amorphous sulfides)
  • halide solid electrolytes nitride solid electrolytes, and hydr
  • composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.
  • the electrode assembly is a wound structure.
  • the positive and negative electrode sheets are wound into a wound structure.
  • the electrode assembly is a stacked structure.
  • the battery cell may include a housing.
  • the housing is used to encapsulate components such as electrode assemblies and electrolytes.
  • the housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.
  • the housing includes an end cap and a casing, the casing having an opening, and the end cap closing the opening to form a sealed space for accommodating substances such as electrode assemblies and electrolytes.
  • the casing may have one or more openings.
  • the end cap may also be provided one or more times.
  • At least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab of the electrode assembly.
  • the electrode terminal can be directly connected to the tab or indirectly connected to the tab via an adapter.
  • the electrode terminal can be located on the end cap or on the housing.
  • an explosion-proof valve is provided on the housing.
  • the explosion-proof valve is used to release the internal pressure of the battery cells.
  • the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes.
  • Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. There are no particular limitations in the embodiments of this application.
  • the battery mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity.
  • the battery can be a battery module, and when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.
  • the battery can be a battery pack, which includes a housing and individual battery cells, with the individual battery cells or battery modules housed within the housing.
  • the housing may be part of the vehicle's chassis structure.
  • a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.
  • the battery can be an energy storage device.
  • Energy storage devices include energy storage containers, energy storage cabinets, etc.
  • Batteries have outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide applicability, and low self-discharge coefficient, making them an important component of the current development of new energy.
  • the battery cells disclosed in this application can be used, but are not limited to, in electrical equipment such as vehicles, ships, or aircraft.
  • a power system for such electrical equipment can be constructed using battery cells and batteries disclosed in this application.
  • the electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric bicycles, electric motorcycles, electric cars, ships, spacecraft, etc.
  • Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc.
  • Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.
  • FIG. 1 is a schematic diagram of a vehicle provided in the first embodiment of this application.
  • the vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle.
  • the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc.
  • a battery 100 is installed inside the vehicle 1000. Battery 100 can be located at the bottom, head, or tail of vehicle 1000. Battery 100 can be used to power vehicle 1000, for example, battery 100 can be used as operating power for vehicle 1000's electrical system, such as for the power requirements of vehicle 1000's start-up, navigation, and operation.
  • the vehicle 1000 may also include a controller 200 and a motor 300.
  • the controller 200 is used to control the battery 100 to supply power to the motor 300, for example, for the power needs of the vehicle 1000 during startup, navigation and driving.
  • the battery 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.
  • the battery 100 includes a housing 10 and a battery cell 20, with the battery cell 20 housed within the housing 10.
  • the housing 10 provides a space for the battery cell 20 and can have various structures.
  • the housing 10 may include a first sub-housing 11 and a second sub-housing 12, which overlap each other, jointly defining a space for accommodating the battery cell 20.
  • the second sub-housing 12 may be a hollow structure with one open end, while the first sub-housing 11 may be a plate-like structure, covering the open side of the second sub-housing 12 so that the first sub-housing 11 and the second sub-housing 12 jointly define the space.
  • both the first sub-housing 11 and the second sub-housing 12 may be hollow structures with one open side, with the open side of the first sub-housing 11 covering the open side of the second sub-housing 12.
  • battery 100 there can be multiple battery cells 20, which can be connected in series, parallel, or in a mixed manner.
  • a mixed connection means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10.
  • battery 100 can also be composed of multiple battery cells 20 first connected in series, parallel, or in a mixed manner to form a battery module, and then multiple battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the housing 10.
  • Battery 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 20.
  • the battery cell 20 can be a secondary battery or a primary battery; the battery cell 20 can also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited to these.
  • the battery cell 20 includes a housing 21, an electrode assembly 22, and electrode terminals 25.
  • the housing 21 includes a shell 211 and an end cap 212.
  • the shell 211 has an opening, and the end cap 212 closes the opening to isolate the internal environment of the battery cell 20 from the external environment.
  • the housing 211 is a component used to cooperate with the end cap 212 to form the internal environment of the battery cell 20, wherein the formed internal environment can accommodate the electrode assembly 22, electrolyte, and other components.
  • the housing 211 and the end cap 212 can be independent components.
  • the housing 211 can have various shapes and sizes. Specifically, the shape of the housing 211 can be determined according to the specific shape and size of the electrode assembly 22.
  • the housing 211 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic.
  • End cap 212 refers to a component that covers the opening of housing 211 to isolate the internal environment of battery cell 20 from the external environment.
  • the shape of end cap 212 can be adapted to the shape of housing 211 to fit it.
  • end cap 212 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 212 is not easily deformed under pressure and impact, allowing battery cell 20 to have higher structural strength and improved reliability.
  • Functional components such as electrode terminals can be provided on end cap 212. Electrode terminals can be used for electrical connection with electrode assembly 22 to output or input electrical energy to battery cell 20.
  • end cap 212 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose special limitations on this.
  • an insulating structure can also be provided on the inner side of end cap 212.
  • the insulating structure can be used to isolate the electrical connection components inside housing 211 from end cap 212 to reduce the risk of short circuit.
  • the insulating structure can be made of plastic, rubber, etc.
  • Electrode assembly 22 is the component in the battery cell 20 where electrochemical reactions occur.
  • the casing 211 may contain one or more electrode assemblies 22.
  • the electrode assembly 22 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets to separate them and mitigate internal short circuits.
  • the portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly, while the portions without active material each constitute a tab.
  • the positive and negative tabs may be located together at one end of the main body or separately at both ends. During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals to form a current loop.
  • the ends of the electrode plates of the electrode assembly have burrs, so a protective layer is needed to wrap the ends to reduce the risk of burrs being exposed, thereby reducing the phenomenon of burrs piercing the separator and causing short circuits between the positive and negative electrode plates.
  • the protective layer consists of two layers of tape, which are bonded to the ends of the electrode on both sides in the thickness direction.
  • the tape includes a substrate and an adhesive layer, with the adhesive layer typically covering the entire surface of the substrate.
  • misalignment can easily occur when the two tapes are bonded to the ends of the electrode on both sides in the thickness direction. This can lead to problems such as exposed adhesive layer, overflowing adhesive, sticking to rollers, delamination, tape breakage, and even electrode damage, affecting the quality and safety of the battery cell.
  • this application proposes a battery cell whose reliability can be improved.
  • the battery cell 20 includes a housing 21 and an electrode assembly 22.
  • the outer shell 21 can be made of metal or non-metal materials, and the outer shell 21 can enclose an accommodating space.
  • the electrode assembly 22 is disposed inside the housing 21, that is, the electrode assembly 22 can be accommodated within the aforementioned accommodating space.
  • the electrode assembly 22 may include a first electrode 221, which may be a positive electrode or a negative electrode. This embodiment of the application does not limit the specific electrode assembly.
  • the first electrode 221 has a first end 221a in the length direction. It can be understood that if the electrode assembly 22 is a wound structure, the length direction of the first electrode 221 is the winding direction of the first electrode 221.
  • the first electrode 221 may have a first end portion 221a at one end in the length direction (represented by the letter X in the attached figure), and the first electrode 221 may also have a first end portion 221a at both ends in the length direction.
  • the first end 221a can be the starting end or the ending end of the winding of the first electrode 221.
  • Electrode assembly 22 also includes a first insulating member 223, which can be disposed at the first end 221a.
  • the first insulating member 223 can block burrs on the first end 221a, reducing the risk of burrs piercing the diaphragm and causing a short circuit between the positive and negative electrodes.
  • the first insulating element 223 includes a first adhesive tape 223a and a second adhesive tape 223b, which are respectively bonded to two sides of the first end 221a in the thickness direction.
  • a first adhesive tape 223a is attached to one side of the first end 221a in the thickness direction
  • a second adhesive tape 223b is attached to the other side of the first end 221a in the thickness direction.
  • both the first adhesive tape 223a and the second adhesive tape 223b extend beyond the first end 221a, and the portions extending beyond the first end 221a are bonded to each other.
  • the first adhesive tape 223a and the second adhesive tape 223b are not flush with the first end 221a, but extend beyond the first end 221a. This allows the first adhesive tape 223a and the second adhesive tape 223b to not only be bonded to the two sides of the first end 221a in the thickness direction respectively, but also to be bonded and fixed together with each other.
  • the first adhesive tape 223a includes a first adhesive region 101 coated with an adhesive layer and a first non-adhesive region 102 not coated with an adhesive layer. Along the width direction of the first electrode 221, the first non-adhesive region 102 is located at at least one end of the first adhesive tape 223a.
  • the adhesive layer of the first adhesive tape 223a will not cover the entire surface of the substrate of the first adhesive tape 223a, but a portion of the area will not be coated with adhesive, thus forming the first non-adhesive area 102.
  • the first non-adhesive region 102 is located at at least one end of the first adhesive tape 223a. That is, the first non-adhesive region 102 can be located at one end of the first adhesive tape 223a in the width direction, or the first non-adhesive region 102 can be located at both ends of the first adhesive tape 223a in the width direction.
  • the first adhesive tape 223a and the second adhesive tape 223b cannot be aligned in the width direction of the first electrode 221 due to the bonding process, since the first non-adhesive area 102 is disposed at at least one end of the first adhesive tape 223a along the width direction of the first electrode 221, the first adhesive tape 223a will not leak adhesive at at least one end of the first electrode 221 in the width direction, but only the non-adhesive first non-adhesive area 102 will be exposed.
  • the first non-adhesive region 102 is located at one end of the first adhesive tape 223a in the width direction, at least when the first adhesive tape 223a is misaligned relative to the second adhesive tape 223b along the width direction of the first electrode 221 (and from the first adhesive region 101 to the first non-adhesive region 102), the first non-adhesive region 102 will leak out instead of directly leaking adhesive.
  • the first non-adhesive region 102 is located at at least one end of the first adhesive tape 223a along the width direction of the first electrode 221, even if the first adhesive tape 223a and the second adhesive tape 223b are misaligned in the width direction of the first electrode 221 due to bonding process tolerances, the first adhesive tape 223a will not leak adhesive at at least one end of the first electrode 221 in the width direction; instead, only the non-adhesive first non-adhesive region 102 will be exposed. This reduces the probability of adhesive leakage from the first insulating member 223, and also reduces problems such as roller sticking, delamination, tape breakage, and even electrode breakage caused by adhesive leakage, thereby improving battery reliability.
  • the first adhesive tape 223a includes two first non-adhesive regions 102.
  • the two first non-adhesive regions 102 are located at both ends of the first adhesive tape 223a, and the first adhesive region 101 is located between the two first non-adhesive regions 102.
  • one first non-adhesive region 102 is connected to one end of the first adhesive region 101, and the other first non-adhesive region 102 is connected to the other end of the first adhesive region 101.
  • the first adhesive tape 223a and the second adhesive tape 223b are misaligned in the width direction of the first electrode 221 due to adhesion process tolerances, the first adhesive tape 223a will not leak adhesive at at least one end in the width direction of the first electrode 221, but will only expose a non-adhesive first non-adhesive area 102. This reduces the probability of adhesive leakage in the first insulating component 223, and also reduces problems such as sticking to the roller, delamination, tape breakage, and even electrode damage caused by adhesive leakage, thereby improving the reliability of the battery.
  • the second adhesive tape 223b includes a second adhesive region 103 coated with an adhesive layer and a second non-adhesive region 104 not coated with an adhesive layer.
  • the first non-adhesive region 102 is located at at least one end of the second adhesive tape 223b.
  • the adhesive layer of the second adhesive tape 223b will not cover the entire surface of the substrate of the second adhesive tape 223b, but a portion of the area will not be coated with adhesive, thus forming the second non-adhesive area 104.
  • the second non-adhesive region 104 is located at at least one end of the second adhesive tape 223b. That is, the second non-adhesive region 104 can be located at one end of the second adhesive tape 223b in the width direction, or the second non-adhesive region 104 can be located at both ends of the second adhesive tape 223b in the width direction.
  • the second adhesive tape 223b and the first adhesive tape 223a are misaligned in the width direction of the first electrode 221 due to adhesion process tolerances, the second adhesive tape 223b will not leak adhesive at at least one end in the width direction of the first electrode 221; instead, only the non-adhesive second non-adhesive area 104 will be exposed. This reduces the probability of adhesive leakage in the first insulating component 223, and also reduces problems such as sticking to the roller, delamination, tape breakage, and even electrode damage caused by adhesive leakage, thereby improving the reliability of the battery.
  • the second adhesive tape 223b includes two second non-adhesive regions 104.
  • the two second non-adhesive regions 104 are located at both ends of the second adhesive tape 223b, and the second adhesive region 103 is located between the two second non-adhesive regions 104.
  • one second non-adhesive region 104 is connected to one end of the second adhesive region 103, and the other second non-adhesive region 104 is connected to the other end of the second adhesive region 103.
  • the second adhesive tape 223b and the first adhesive tape 223a are misaligned in the width direction of the first electrode 221 due to adhesion process tolerances, the second adhesive tape 223b will not leak adhesive at at least one end in the width direction of the first electrode 221; instead, only the non-adhesive second non-adhesive area 104 will be exposed. This reduces the probability of adhesive leakage in the first insulating component 223, and also reduces problems such as sticking to the roller, delamination, tape breakage, and even electrode damage caused by adhesive leakage, thereby improving the reliability of the battery.
  • the first adhesive tape 223a includes two first non-adhesive regions 102, located at both ends of the first adhesive tape 223a along the width direction of the first electrode 221, and a first adhesive region 101 located between the two first non-adhesive regions 102.
  • the second adhesive tape 223b includes two second non-adhesive regions 104, located at both ends of the second adhesive tape 223b along the width direction of the first electrode 221, and a second adhesive region 103 located between the two second non-adhesive regions 104.
  • the first adhesive tape 223a and the second adhesive tape 223b will not leak adhesive at either end of the first electrode 221 in the width direction. Instead, only the non-adhesive first non-adhesive area 102 and the second non-adhesive area 104 will be exposed. This reduces the probability of adhesive leakage in the first insulating component 223, and also reduces problems such as sticking to the roller, delamination, tape breakage, and even electrode damage caused by adhesive leakage, thereby improving the reliability of the battery.
  • the first electrode 221 includes a first functional region 105 coated with an active material layer and a first empty foil region 106 not coated with an active material layer.
  • first empty foil region 106 in this application refers to the fact that neither of the two sides of the first empty foil region 106 in the thickness direction is coated with an active material layer.
  • the first functional area 105 has a first edge 105a and a second edge 105b.
  • the first adhesive area 101 can be attached to the first functional area 105, and the second adhesive area 103 can be attached to the first functional area 105.
  • the first viscous region 101 extends beyond at least one of the first edge 105a and the second edge 105b.
  • the first adhesive region 101 extends beyond the first edge 105a or the second edge 105b, or the first adhesive region 101 extends beyond the first edge 105a and the second edge 105b.
  • the first adhesive area 101 can not only be bonded to the first functional area 105, but also the part of the first adhesive area 101 that extends beyond the first functional area 105 can be bonded to the first empty foil area 106 or the second adhesive tape 223b, thereby improving the connection stability of the first adhesive tape 223a.
  • the second viscous region 103 extends beyond at least one of the first edge 105a and the second edge 105b.
  • the second adhesive region 103 extends beyond the first edge 105a or the second edge 105b, or the second adhesive region 103 extends beyond the first edge 105a and the second edge 105b.
  • the second adhesive area 103 can not only be bonded to the first functional area 105, but the part of the second adhesive area 103 that extends beyond the first functional area 105 can also be bonded to the first empty foil area 106 or the first adhesive tape 223a, thereby improving the connection stability of the second adhesive tape 223b.
  • the first adhesive region 101 and the second adhesive region 103 both extend beyond the first edge 105a and the second edge 105b.
  • the first adhesive area 101 can not only be bonded to the first functional area 105, but also the portion of the first adhesive area 101 extending beyond the first functional area 105 can be bonded to the first empty foil area 106 or the second adhesive tape 223b, thereby improving the connection stability of the first adhesive tape 223a;
  • the second adhesive area 103 can not only be bonded to the first functional area 105, but also the portion of the second adhesive area 103 extending beyond the first functional area 105 can be bonded to the empty foil area or the first adhesive tape 223a, thereby improving the connection stability of the second adhesive tape 223b.
  • the first electrode 221 includes a first functional region 105 coated with active material and a first empty foil region 106 not coated with active material.
  • the first functional region 105 has a first edge 105a and a second edge 105b, and neither the first adhesive region 101 nor the second adhesive region 103 extends beyond the first edge 105a and the second edge 105b.
  • the first empty foil region 106 is connected to the second edge 105b, and the first empty foil region 106 has a third edge 106a away from the first functional region 105.
  • first empty foil area 106 there can be one first empty foil area 106, and the second edge 105b is connected to the first empty foil area 106.
  • the first edge 105a is not connected to the first empty foil area 106.
  • the first edge 105a can be one edge of the first electrode 221 in the width direction.
  • the first edge 105a and the third edge 106a are the two edges of the first end 221a in the width direction of the first electrode 221.
  • the first adhesive tape 223a extends beyond at least one of the first edge 105a and the third edge 106a, and/or the second adhesive tape 223b extends beyond at least one of the first edge 105a and the third edge 106a.
  • the first adhesive tape 223a extends beyond the first edge 105a or the third edge 106a, or the first adhesive tape 223a extends beyond both the first edge 105a and the third edge 106a.
  • the second adhesive tape 223b extends beyond the first edge 105a or the third edge 106a, or the second adhesive tape 223b extends beyond both the first edge 105a and the third edge 106a.
  • the first adhesive area 101 on the first adhesive tape 223a may extend beyond the first edge 105a or the third edge 106a, or the first adhesive area 101 may extend beyond both the first edge 105a and the third edge 106a.
  • the first adhesive area 101 of the first adhesive tape 223a may also not extend beyond either the first edge 105a or the third edge 106a.
  • the second adhesive area 103 on the second adhesive tape 223b may extend beyond the first edge 105a or the third edge 106a, or the first adhesive area 101 may extend beyond both the first edge 105a and the third edge 106a.
  • the second adhesive area 103 of the second adhesive tape 223b may also not extend beyond either the first edge 105a or the third edge 106a.
  • the first end 221a has a fourth edge 106b, which can be the edge of the first end 221a in the length direction of the first pole piece 221.
  • both the first adhesive tape 223a and the second adhesive tape 223b extend beyond the fourth edge 106b.
  • the portion of the first adhesive tape 223a extending beyond the fourth edge 106b and the portion of the second adhesive tape 223b extending beyond the fourth edge 106b can be bonded together.
  • connection between the third edge 106a and the fourth edge 106b is located between the first non-adhesive region 102 and the second non-adhesive region 104.
  • the corners of the first empty foil area 106 (the junction of the third edge 106a and the fourth edge 106b) can be fixed and supported by the first non-adhesive area 102 and the second non-adhesive area 104, effectively reducing the probability of the first electrode 221 being bent or deformed.
  • the strength of the first non-adhesive region 102 and the strength of the second non-adhesive region 104 are both greater than the strength of the first electrode 221. Therefore, the first non-adhesive region 102 and the second non-adhesive region 104 can support the first electrode 221.
  • the size of the first non-adhesive region 102 along the width direction of the first electrode 221 is L0 , which satisfies: 1mm ⁇ L0 ⁇ 6mm .
  • the dimensions of the first non-adhesive region 102 are 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, and 6mm.
  • the dimensions of the first non-adhesive region 102 in the width direction of the first electrode 221 described above are merely specific examples and are not intended to limit the dimensions of the first non-adhesive region 102 in the width direction of the first electrode 221. Any dimension of the first non-adhesive region 102 in the width direction of the first electrode 221 that satisfies the above-described range is within the protection scope of this application.
  • the dimensions of the first non-adhesive region 102 in the width direction of the first electrode 221 meet the above-mentioned range, on the one hand, it ensures that when the first adhesive tape 223a and the second adhesive tape 223b are misaligned in the width direction of the first electrode 221, the width of the first non-adhesive region 102 is sufficient, and the adhesive layer of the first adhesive tape 223a will not be exposed; on the other hand, it also ensures that the dimensions of the first non-adhesive region 102 are not too large, which would result in insufficient dimensions of the first adhesive region 101, thereby affecting the bonding performance of the first adhesive tape 223a.
  • the dimensions of the first non-adhesive region 102 are 2mm, 2.4mm, 2.8mm, 3.2mm, 3.6mm, and 4mm.
  • the width of the first non-adhesive region 102 in the width direction of the first electrode 221 meet the above-mentioned range, on the one hand, it ensures that when the first adhesive tape 223a and the second adhesive tape 223b are misaligned in the width direction of the first electrode 221, the width of the first non-adhesive region 102 is sufficient, further ensuring that the adhesive layer of the first adhesive tape 223a is not exposed; on the other hand, it also further ensures that the dimensions of the first non-adhesive region 102 are not too large, resulting in insufficient dimensions of the first adhesive region 101, thereby affecting the bonding performance of the first adhesive tape 223a.
  • the maximum thickness of the first adhesive tape 223a is t1
  • the maximum thickness of the second adhesive tape 223b is t2
  • the maximum thickness of the first end 221a is t3 , satisfying: t1 ⁇ t3 , t2 ⁇ t3 .
  • first end 221a is not provided with the first insulating member 223, there is a step between the first end 221a and its adjacent electrode. After the battery cell 20 expands, the presence of the step will cause it to easily come into contact with the outer casing 21 or the adjacent electrode area, resulting in stress concentration, which may lead to the risk of electrode breakage.
  • the maximum thickness of the first adhesive tape 223a is less than the maximum thickness of the first end piece 221a, even if a step is formed between the first adhesive tape 223a and the first end piece 221a on the side in the thickness direction, the step is smaller than the step height between the first end piece 221a and the adjacent electrode area when the first insulating member 223 is not provided. This reduces stress concentration caused by the step and decreases the risk of the first electrode piece 221 breaking due to stress concentration.
  • the maximum thickness of the second adhesive tape 223b is less than the maximum thickness of the first end piece 221a, even if a step is formed between the second adhesive tape 223b and the first end piece 221a on the side in the thickness direction, the step is smaller than the step height between the first end piece 221a and the adjacent electrode area when the first insulating member 223 is not provided. This reduces stress concentration caused by the step and decreases the risk of the first electrode piece 221 breaking due to stress concentration.
  • t1 + t2 ⁇ t3 t1 + t2 ⁇ t3 .
  • the first adhesive tape 223a and the second adhesive tape 223b are attached to the two sides of the first end 221a in the thickness direction, and the thickness of the first adhesive tape 223a and the thickness of the second adhesive tape 223b satisfy: t 1 + t 2 ⁇ t 3 .
  • the height of the step is small and is always less than the step height between the first end 221a and the adjacent electrode area when the first insulating member 223 is not provided. This reduces the stress concentration caused by the step and reduces the risk of the first electrode 221 breaking due to stress concentration.
  • t1 ⁇ 0.5t3 and t2 ⁇ 0.5t3 This further reduces the step height between the first adhesive strip 223a and the first end 221a, and also reduces the step height between the second adhesive strip 223b and the first end 221a. This reduces stress concentration caused by the step, thus decreasing the risk of the first electrode 221 breaking.
  • the electrode assembly 22 is a wound structure, if the first insulating member 223 is not provided, a step will be generated between the first end 221a and its adjacent inner or outer electrode.
  • the projection of the first insulating member 223 and the projection of the first end 221a have a first overlapping area.
  • the maximum size of the first overlapping area is L1 , which satisfies: L1 ⁇ 100mm.
  • the maximum size L1 of the first overlapping area can be 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, or 100mm.
  • the maximum size of the first overlapping region described above is merely a specific example and is not intended to limit the maximum size of the first overlapping region. Any maximum size of the first overlapping region that meets the above range is within the protection scope of this application.
  • the first insulating member 223 is always connected to the first end 221a, at least covering a part of the first end 221a, to block burrs and reduce the probability of burrs piercing the separator; on the other hand, the first overlapping area will not be too large, and the first insulating member 223 will not cover too much area of the first electrode 221, thereby taking into account the energy density of the battery cell 20.
  • 2mm ⁇ L 1 ⁇ 15mm the maximum size of the first overlapping area is 2mm, 4mm, 6mm, 8mm, 10mm, 12mm, 14mm, or 15mm.
  • the maximum size of the first overlapping region described above is merely a specific example and is not intended to limit the maximum size of the first overlapping region. Any maximum size of the first overlapping region that meets the above range is within the protection scope of this application.
  • the first insulating member 223 is always connected to the first end 221a, at least covering a part of the first end 221a, to block burrs and further reduce the probability of burrs piercing the separator; on the other hand, the first overlapping area will not be too large, and the first insulating member 223 will not cover too much area of the first electrode 221, thereby further taking into account the energy density of the battery cell 20.
  • the first electrode 221 has two first ends 221a, which are located at both ends of the first electrode 221 in the length direction, and each first end 221a is provided with a first insulating member 223.
  • both ends of the first electrode 221 in the length direction can be protected by the first insulating member 223, which effectively blocks the burrs at both ends of the first electrode 221 in the length direction, reduces the risk of burrs piercing the separator and causing a short circuit between the positive and negative electrodes, and improves the reliability of the battery.
  • the electrode assembly 22 further includes a second electrode 222, the polarity of which is opposite to that of the first electrode 221.
  • the second electrode 222 is one of the positive electrode and the negative electrode
  • the first electrode 221 is the other of the positive electrode and the negative electrode.
  • the first electrode 221 is the positive electrode; if the second electrode 222 is the positive electrode, then the first electrode 221 is the negative electrode.
  • the second electrode 222 has a second end 222a in the length direction. It can be understood that if the electrode assembly 22 is a wound structure, then the second electrode... The length direction of 222 is the winding direction of the second electrode 222.
  • the second electrode 222 may have a second end portion 222a at one end in the length direction, and the second electrode 222 may also have a second end portion 222a at both ends in the length direction.
  • the second end 222a can be the starting end or the ending end of the winding of the second electrode 222.
  • Electrode assembly 22 also includes a second insulating member 224, which can be disposed at the second end 222a.
  • the second insulating member 224 can block burrs on the second end 222a, reducing the problem of positive and negative short circuits caused by burrs piercing the diaphragm.
  • the second insulating member 224 includes a third adhesive tape 224a and a fourth adhesive tape 224b, which are respectively bonded to two sides of the second end 222a in the thickness direction.
  • a third adhesive tape 224a is attached to one side of the second end 222a in the thickness direction
  • a fourth adhesive tape 224b is attached to the other side of the second end 222a in the thickness direction.
  • the third adhesive tape 224a and the fourth adhesive tape 224b both extend beyond the second end 222a, and the portions extending beyond the second end 222a are bonded to each other.
  • the third adhesive tape 224a and the fourth adhesive tape 224b are not flush with the second end 222a, but extend beyond the second end 222a. This allows the third adhesive tape 224a and the fourth adhesive tape 224b to not only be bonded to the two sides of the second end 222a in the thickness direction respectively, but also to be bonded and fixed together with each other.
  • the third adhesive tape 224a includes a third adhesive region 107a coated with an adhesive layer and a third non-adhesive region 107b uncoated with an adhesive layer.
  • the third non-adhesive region 107b is located at at least one end of the third adhesive tape 224a.
  • the adhesive layer of the third adhesive tape 224a will not cover the entire surface of the substrate of the third adhesive tape 224a, but a portion of the area will not be coated with adhesive, thus forming the third non-adhesive area 107b.
  • the third non-adhesive region 107b is located at at least one end of the third adhesive tape 224a. That is, the third non-adhesive region 107b can be located at one end of the third adhesive tape 224a in the width direction, or the third non-adhesive region 107b can be located at both ends of the third adhesive tape 224a in the width direction.
  • the third adhesive tape 224a and the fourth adhesive tape 224b cannot be aligned in the width direction of the second electrode 222 due to the bonding process, since the third non-adhesive area 107b is disposed at at least one end of the third adhesive tape 224a along the width direction of the second electrode 222, the third adhesive tape 224a will not leak adhesive at at least one end of the second electrode 222 in the width direction, but only the non-adhesive third non-adhesive area 107b will be exposed.
  • the third non-adhesive region 107b is located at one end of the third adhesive tape 224a in the width direction, at least when the third adhesive tape 224a moves and misaligns relative to the fourth adhesive tape 224b along the width direction of the second electrode 222 (from the third adhesive region 107a to the third non-adhesive region 107b), the third non-adhesive region 107b will leak out instead of directly leaking adhesive.
  • the third adhesive tape 224a includes two third non-adhesive regions 107b.
  • the two third non-adhesive regions 107b are located at both ends of the third adhesive tape 224a, and the third adhesive region 107a is located between the two third non-adhesive regions 107b.
  • one third non-adhesive region 107b is connected to one end of the third adhesive region 107a, and the other third non-adhesive region 107b is connected to the other end of the third adhesive region 107a.
  • the third adhesive tape 224a and the fourth adhesive tape 224b are misaligned in the width direction of the second electrode 222 due to adhesion process tolerances, the third adhesive tape 224a will not leak adhesive at at least one end of the second electrode 222 in the width direction; instead, only the non-adhesive third non-adhesive area 107b will be exposed. This reduces the probability of adhesive leakage in the second insulating component 224, and also reduces problems such as sticking to the roller, delamination, tape breakage, and even electrode damage caused by adhesive leakage, thereby improving the reliability of the battery.
  • the fourth adhesive tape 224b includes a fourth adhesive region 108a coated with an adhesive layer and a fourth non-adhesive region 108b not coated with an adhesive layer.
  • the fourth non-adhesive region 108b is located at at least one end of the fourth adhesive tape 224b.
  • the adhesive layer of the fourth adhesive tape 224b will not cover the entire surface of the substrate of the fourth adhesive tape 224b, but a portion of the area will not be coated with adhesive, thus forming the fourth non-adhesive area 108b.
  • the fourth non-adhesive region 108b is located at at least one end of the fourth adhesive tape 224b. That is, the fourth non-adhesive region 108b can be located at one end of the fourth adhesive tape 224b in the width direction, or the fourth non-adhesive region 108b can be located at both ends of the fourth adhesive tape 224b in the width direction.
  • the fourth adhesive tape 224b and the third adhesive tape 224a are misaligned in the width direction of the second electrode 222 due to adhesion process tolerances, the fourth adhesive tape 224b will not leak adhesive at at least one end of the second electrode 222 in the width direction; instead, only the non-adhesive fourth non-adhesive area 108b will be exposed. This reduces the probability of adhesive leakage in the second insulating component 224, and also reduces problems such as sticking to the roller, delamination, tape breakage, and even electrode damage caused by adhesive leakage, thereby improving the reliability of the battery.
  • the fourth adhesive tape 224b includes two fourth non-adhesive regions 108b.
  • the two fourth non-adhesive regions 108b are located at both ends of the fourth adhesive tape 224b, and the fourth adhesive region 108a is located between the two fourth non-adhesive regions 108b.
  • one fourth non-adhesive region 108b is connected to one end of the fourth adhesive region 108a, and the other fourth non-adhesive region 108b is connected to the other end of the fourth adhesive region 108a.
  • the fourth adhesive tape 224b and the third adhesive tape 224a are misaligned in the width direction of the second electrode 222 due to adhesion process tolerances, the fourth adhesive tape 224b will not leak adhesive at at least one end of the second electrode 222 in the width direction; instead, only the non-adhesive fourth non-adhesive area 108b will be exposed. This reduces the probability of adhesive leakage in the second insulating component 224, and also reduces problems such as sticking to the roller, delamination, tape breakage, and even electrode damage caused by adhesive leakage, thereby improving the reliability of the battery.
  • the third adhesive tape 224a includes two third non-adhesive regions 107b.
  • the two third non-adhesive regions 107b are located at both ends of the third adhesive tape 224a, and the third adhesive region 107a is located between the two third non-adhesive regions 107b.
  • the fourth adhesive tape 224b includes two fourth non-adhesive regions 108b.
  • the two fourth non-adhesive regions 108b are located at both ends of the fourth adhesive tape 224b, and the fourth adhesive region 108a is located between the two fourth non-adhesive regions 108b.
  • the third adhesive tape 224a and the fourth adhesive tape 224b will not leak adhesive at either end of the second electrode 222 in the width direction. Instead, only the non-adhesive third non-adhesive area 107b and the fourth non-adhesive area 108b will be exposed. This reduces the probability of adhesive leakage in the second insulating component 224, and also reduces problems such as sticking to the roller, delamination, tape breakage, and even electrode damage caused by adhesive leakage, thereby improving the reliability of the battery.
  • the second electrode 222 has two second ends 222a, which are located at both ends of the second electrode 222 in the length direction, and each second end 222a is provided with a second insulating member 224.
  • both ends of the second electrode 222 in the length direction can be protected by the second insulating member 224, which effectively blocks the burrs at both ends of the second electrode 222 in the length direction, reduces the risk of burrs piercing the separator and causing a short circuit between the positive and negative electrodes, and improves the reliability of the battery.
  • the electrode assembly 22 has a wound structure, and the length direction of the first electrode 221 is the winding direction of the first electrode 221. Therefore, the first end 221a can be the winding start end and/or winding end end of the first electrode 221.
  • first end 221a When the first end 221a is located at the innermost ring of the multi-turn electrode sheet, along the winding direction, a portion of the first insulating member 223 can be bonded to the two sides of the first end 221a in the thickness direction. Another portion of the first insulating member 223 extends beyond the first end 221a and is wound into a multi-turn structure.
  • the multi-turn structure is located in the central region of the electrode assembly 22, so that it can play a role in supporting the electrode assembly 22 when the electrode assembly 22 expands.
  • the battery 100 of this application embodiment is briefly described below.
  • the battery 100 according to the embodiments of this application includes the battery cell 20 of the above embodiments. Since the battery 100 according to the embodiments of this application includes the battery cell 20, the reliability of the battery 100 is improved.
  • the electrical device according to the embodiments of this application includes the battery 100 of the above embodiments. Since the electrical device according to the embodiments of this application includes the battery 100, the stability of the electrical device is improved, thereby enhancing the user experience.

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Abstract

一种电池单体（20）、电池（100）和用电设备，该电池单体（20）包括外壳（21）和电极组件（22）：电极组件（22）设置于所述外壳（21）内，所述电极组件（22）包括第一极片（221）和第一绝缘件（223），所述第一极片（221）在长度方向上具有第一端部（221a）；第一绝缘件（223）包括第一胶纸（223a）和第二胶纸（223b），所述第一胶纸（223a）和所述第二胶纸（223b）分别粘接于所述第一端部（221a）在厚度方向上的两个侧面；沿所述第一极片（221）的长度方向，所述第一胶纸（223a）和所述第二胶纸（223b）均超出所述第一端部（221a），且超出所述第一端部（221a）的部分相互粘接；其中，所述第一胶纸（223a）包括涂覆有胶层的第一粘性区（101）和未涂覆有胶层的第一非粘性区（102），沿所述第一极片（221）的宽度方向，所述第一非粘性区（102）位于所述第一胶纸（223a）的至少一端。

Description

电池单体、电池和用电设备
相关申请的交叉引用
本申请要求享有2024年5月13日提交的名称为“电池单体、电池和用电设备”的中国专利申请(202410591758.0)的优先权，该申请的全部内容通过引用并入本文中。
技术领域
本申请涉及电池技术领域，具体而言，涉及一种电池单体、电池和用电设备。
背景技术
车辆使用节能减排是汽车产业可持续发展的关键，电动车辆由于其节能环保的优势成为汽车产业可持续发展的重要组成部分。对于电动车辆而言，电池技术又是关乎其发展的一项重要因素。
电池广泛应用于便携式电子设备、电动交通工具、电动工具、无人机、储能设备等领域。电池的制造过程中，电池中部件的可靠性是一个不可忽视的问题。因此，如何提高电池的可靠性是电池技术中一个亟需解决的技术问题。
发明内容
本申请提供一种电池单体、电池和用电设备，可以提高电池的可靠性。
本申请是通过下述技术方案实现的：
第一方面，本申请实施例提供一种电池单体，包括外壳和电极组件：电极组件设置于所述外壳内，所述电极组件包括第一极片和第一绝缘件，所述第一极片在长度方向上具有第一端部；第一绝缘件包括第一胶纸和第二胶纸，所述第一胶纸和所述第二胶纸分别粘接于所述第一端部在厚度方向上的两个侧面；沿所述第一极片的长度方向，所述第一胶纸和所述第二胶纸均超出所述第一端部，且超出所述第一端部的部分相互粘接；
其中，所述第一胶纸包括涂覆有胶层的第一粘性区和未涂覆有胶层的第一非粘性区，沿所述第一极片的宽度方向，所述第一非粘性区位于所述第一胶纸的至少一端。
根据本申请实施例的电池单体，由于沿所述第一极片的宽度方向，第一非粘性区位于所述第一胶纸的至少一端。因此，即使由于贴附工艺公差，导致第一胶纸和第二胶纸在第一极片的宽度方向上产生错位，第一胶纸在第一极片宽度方向上的至少一端不会漏胶，而是仅仅漏出没有粘性的第一非粘性区。由此，降低了第一绝缘件的漏胶几率，也降低了由于漏胶导致的粘辊、脱胶、断带，甚至极片破损等问题，进而提高了电池的可靠性。
根据本申请的一些实施例，所述第一胶纸包括两个所述第一非粘性区，沿所述第一极片的宽度方向，两个所述第一非粘性区分别位于所述第一胶纸的两端，所述第一粘性区位于两个所述第一非粘性区之间。
在上述方案中，即使由于贴附工艺公差，导致第一胶纸和第二胶纸在第一极片的宽度方向上产生错位，第一胶纸在第一极片宽度方向上的至少一端不会漏胶，而是仅仅漏出没有粘性的第一非粘性区。由此，降低了第一绝缘件的漏胶几率，也降低了由于漏胶导致的粘辊、脱胶、断带，甚至极片破损等问题，进而提高了电池的可靠性。
根据本申请的一些实施例，所述第二胶纸包括涂覆有胶层的第二粘性区和未涂覆有胶层的第二非粘性区，沿所述第一极片的宽度方向，所述第二非粘性区位于所述第二胶纸的至少一端。
在上述方案中，即使由于贴附工艺公差，导致第二胶纸和第一胶纸在第一极片的宽度方向上产生错位，第二胶纸在第一极片宽度方向上的至少一端不会漏胶，而是仅仅漏出没有粘性的第二非粘性区。由此，降低了第一绝缘件的漏胶几率，也降低了由于漏胶导致的粘辊、脱胶、断带，甚至极片破损等问题，进而提高了电池的可靠性。
根据本申请的一些实施例，所述第二胶纸包括两个所述第二非粘性区，沿所述第二极片的宽度方向，两个所述第二非粘性区分别位于所述第二胶纸的两端，所述第二粘性区位于两个所述第二非粘性区之间。
在上述方案中，即使由于贴附工艺公差，导致第二胶纸和第一胶纸在第一极片的宽度方向上产生错位，第二胶纸在第一极片宽度方向上的至少一端不会漏胶，而是仅仅漏出没有粘性的第二非粘性区。由此，降低了第一绝缘件的漏胶几率，也降低了由于漏胶导致的粘辊、脱胶、断带，甚至极片破损等问题，进而提高了电池的可靠性。
根据本申请的一些实施例，沿所述第一极片的宽度方向，所述第一极片包括涂覆有活性物质层的第一功能区和未涂覆有活性物质层的第一空箔区；沿所述第一极片的宽度方向，所述第一功能区具有第一边缘和第二边缘；沿所述第一极片的宽度方向，所述第一粘性区超出所述第一边缘和所述第二边缘中的至少一个，和/或，所述第 二粘性区超出所述第一边缘和所述第二边缘中的至少一个。
在上述方案中，第一粘性区不仅可以粘接于第一功能区，同时第一粘性区超出第一功能区的部分可以粘接在第一空箔区或者第二胶纸上，从而提升了第一胶纸的连接稳固性。
根据本申请的一些实施例，沿所述第一极片的宽度方向，所述第一粘性区和所述第二粘性区均超出所述第一边缘和所述第二边缘。
在上述方案中，第一粘性区不仅可以粘接于第一功能区，同时第一粘性区超出第一功能区的部分可以粘接在第一空箔区或者第二胶纸上，从而提升了第一胶纸的连接稳固性；第二粘性区不仅可以粘接于第一功能区，同时第二粘性区超出第一功能区的部分可以粘接在空箔区或者第一胶纸上，从而提升了第二胶纸的连接稳固性。
根据本申请的一些实施例，沿所述第一极片的宽度方向，所述第一极片包括涂覆有活性物质层的第一功能区和未涂覆有活性物质层的第一空箔区；沿所述第一极片的宽度方向，所述第一功能区具有第一边缘和第二边缘，所述第一粘性区和所述第二粘性区均未超出所述第一边缘和所述第二边缘。
在上述方案中，减少了第一绝缘件对第一端部的遮挡，至少在一定程度上提高了电池单体的能量密度。
根据本申请的一些实施例，沿所述第一极片的宽度方向，所述第一空箔区连接于所述第二边缘，所述第一空箔区具有远离所述第一功能区的第三边缘；沿所述第一极片的宽度方向，所述第一胶纸超出所述第一边缘和所述第三边缘中的至少一个，和/或，所述第二胶纸超出所述第一边缘和所述第三边缘中的至少一个。
在上述方案中，沿第一极片的宽度方向，第一胶纸超出第一边缘或第三边缘，或者第一胶纸超出第一边缘和第三边缘。沿第一极片的宽度方向，第二胶纸超出第一边缘或第三边缘，或者第二胶纸超出第一边缘和第三边缘。
根据本申请的一些实施例，所述第一端部具有第四边缘，沿所述第一极片的长度方向，所述第一胶纸与所述第二胶纸均超出所述第四边缘；沿所述第一极片的厚度方向，所述第三边缘与所述第四边缘的连接处位于所述第一非粘性区和所述第二非粘性区之间。
在上述方案中，第一空箔区的边角(第三边缘和第四边缘的连接处)可以被第一非粘性区和第二非粘性区固定支撑，有效降低了第一极片出现打折变形等问题的几率。
根据本申请的一些实施例，沿所述第一极片的宽度方向，所述第一非粘性区的尺寸为L0，满足：1mm≤L0≤6mm。
在上述方案中，一方面，可以使得第一胶纸和第二胶纸在第一极片的宽度方向上发生错位时，第一非粘性区的宽度足够，第一胶纸的胶层不会露出；另一方面，也使得第一非粘性区的尺寸不至于过大，导致第一粘性区的尺寸不足，从而影响第一胶纸的粘接性能。
根据本申请的一些实施例，所述第一胶纸的最大厚度为t1，所述第二胶纸的最大厚度为t2，所述第一端部的最大厚度为t3，满足：t1≤t3，t2≤t3。
在上述方案中，由于第一胶纸的最大厚度小于第一端部的最大厚度，即使第一胶纸与第一端部在厚度方向上的侧面之间形成台阶，该台阶也小于不设置第一绝缘件时第一端部与相邻的极片区域之间的台阶高度，从而降低了由于台阶产生的应力集中，减小了由于应力集中导致的第一极片出现碎裂的风险。同样的，由于第二胶纸的最大厚度小于第一端部的最大厚度，即使第二胶纸与第一端部在厚度方向上的侧面之间形成台阶，该台阶也小于不设置第一绝缘件时第一端部与相邻的极片区域之间的台阶高度，从而降低了由于台阶产生的应力集中，减小了由于应力集中导致的第一极片出现碎裂的风险。
根据本申请的一些实施例，t1+t2≤t3。
在上述方案中，即使第一胶纸和第二胶纸仍然会与第一端部在厚度方向的侧面之间形成台阶，但该台阶高度较小，且总是小于不设置第一绝缘件时第一端部与相邻的极片区域之间的台阶高度，从而降低了由于台阶产生的应力集中，减小了由于应力集中导致的第一极片出现碎裂的风险。
根据本申请的一些实施例，t1≤0.5t3，t2≤0.5t3。
在上述方案中，进一步降低了第一胶纸与第一端部之间的台阶高度，降低了第二胶纸与第一端部之间的台阶高度。从而降低了由于台阶产生的应力集中，减小了第一极片出现碎裂的破裂的风险。
根据本申请的一些实施例，沿所述第一端部的厚度方向，所述第一绝缘件的投影与所述第一端部的投影具有第一重叠区，沿所述第一极片的长度方向，所述第一重叠区的最大尺寸为L1，满足：L1≤100mm。
在上述方案中，一方面，第一绝缘件总是要与第一端部连接，至少覆盖第一端部的一部分，遮挡毛刺，降低毛刺刺穿隔膜的几率；另一方面，第一重叠区也不会过大，第一绝缘件不会覆盖第一极片的过多区域，从而对电池单体的能量密度影响较小。
根据本申请的一些实施例，2mm≤L1≤15mm。
在上述方案中，一方面，第一绝缘件总是要与第一端部连接，至少覆盖第一端部的一部分，遮挡毛刺，进一步降低毛刺刺穿隔膜的几率；另一方面，第一重叠区也不会过大，第一绝缘件不会覆盖第一极片的过多区域，从而进一步兼顾了电池单体的能量密度。
根据本申请的一些实施例，所述第一极片具有两个所述第一端部，两个所述第一端部分别位于所述第一极片在长度方向上的两端，每个所述第一端部均设置有所述第一绝缘件。
在上述方案中，第一极片在长度方向上的两端均可以被第一绝缘件保护，有效遮挡了第一极片在长度方向上的两端的毛刺，降低了毛刺刺穿隔膜导致正负极片短路的风险，提升了电池的可靠性。
根据本申请的一些实施例，所述电极组件还包括：第二极片，所述第二极片为正极极片和负极极片中的一个，所述第一极片为所述正极极片和所述负极极片中的一个，所述第二极片在长度方向上具有第二端部；第二绝缘件，包括第三胶纸和第四胶纸，所述第三胶纸和所述第四胶纸分别粘接于所述第二端部在厚度方向上的两个侧面；沿所述第二极片的长度方向，所述第三胶纸和所述第四胶纸均超出所述第二端部，且超出所述第二端部的部分相互粘接；
其中，所述第三胶纸包括涂覆有胶层的第三粘性区和未涂覆有胶层的第三非粘性区，沿所述第二极片的宽度方向，所述第三非粘性区位于所述第三胶纸的至少一端。
在上述方案中，在第三胶纸和第四胶纸在第二极片的宽度方向上由于贴附工艺无法对齐时，由于沿第二极片宽度方向，第三非粘性区设置于第三胶纸的至少一端，因此第三胶纸在第二极片宽度方向上的至少一端不会漏胶，而是仅仅漏出没有粘性的第三非粘性区。
根据本申请的一些实施例，所述第三胶纸包括两个所述第三非粘性区，沿所述第二极片的宽度方向，两个所述第三非粘性区分别位于所述第三胶纸的两端，所述第三粘性区位于两个所述第三非粘性区之间。
在上述方案中，即使由于贴附工艺公差，导致第三胶纸和第四胶纸在第二极片的宽度方向上产生错位，第三胶纸在第二极片宽度方向上的至少一端不会漏胶，而是仅仅漏出没有粘性的第三非粘性区。由此，降低了第二绝缘件的漏胶几率，也降低了由于漏胶导致的粘辊、脱胶、断带，甚至极片破损等问题，进而提高了电池的可靠性。
根据本申请的一些实施例，所述第四胶纸包括涂覆有胶层的第四粘性区和未涂覆有胶层的第四非粘性区，沿所述第二极片的宽度方向，所述第四非粘性区位于所述第四胶纸的至少一端。
在上述方案中，即使由于贴附工艺公差，导致第四胶纸和第三胶纸在第二极片的宽度方向上产生错位，第四胶纸在第二极片宽度方向上的至少一端不会漏胶，而是仅仅漏出没有粘性的第四非粘性区。由此，降低了第二绝缘件的漏胶几率，也降低了由于漏胶导致的粘辊、脱胶、断带，甚至极片破损等问题，进而提高了电池的可靠性。
根据本申请的一些实施例，所述第四胶纸包括两个所述第四非粘性区，沿所述第二极片的宽度方向，两个所述第四非粘性区分别位于所述第四胶纸的两端，所述第四粘性区位于两个所述第四非粘性区之间。
在上述方案中，即使由于贴附工艺公差，导致第四胶纸和第三胶纸在第二极片的宽度方向上产生错位，第四胶纸在第二极片宽度方向上的至少一端不会漏胶，而是仅仅漏出没有粘性的第四非粘性区。由此，降低了第二绝缘件的漏胶几率，也降低了由于漏胶导致的粘辊、脱胶、断带，甚至极片破损等问题，进而提高了电池的可靠性。
根据本申请的一些实施例，所述第二极片具有两个所述第二端部，两个所述第二端部分别位于所述第二极片在长度方向上的两端，每个所述第二端部均设置有所述第二绝缘件。
在上述方案中，第二极片在长度方向上的两端均可以被第二绝缘件保护，有效遮挡了第二极片在长度方向上的两端的毛刺，降低了毛刺刺穿隔膜导致正负极片短路的风险，提升了电池的可靠性。
根据本申请的一些实施例，所述电极组件为卷绕式结构，所述第一极片的长度方向为所述第一极片的卷绕方向。
在上述方案中，第一端部可以为第一极片的卷绕起始端或/和卷绕收尾端。
第二方面，本申请实施例提供一种电池，包括上述实施例所述的电池单体。
第三方面，本申请实施例提供一种用电设备，包括上述实施例所述的电池。
本申请的附加方面和优点将在下面的描述中部分给出，部分将从下面的描述中变得明显，或通过本申请的实践了解到。
附图说明
为了更清楚地说明本申请实施例的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，应当理解，以下附图仅示出了本申请的某些实施例，因此不应被看作是对范围的限定，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，还可以根据这些附图获得其他相关的附图。
图1为本申请实施例提供的车辆的示意图；
图2为本申请实施例提供的电池的爆炸图；
图3为本申请实施例提供的电池单体的爆炸图；
图4为本申请实施例提供的一个电极组件的示意图；
图5为本申请实施例提供的一个第一极片和第二极片展开后的示意图；
图6为本申请实施例提供的另一个电极组件的示意图；
图7为本申请实施例提供的再一个电极组件的示意图；
图8为本申请实施例提供的一个第一端部与第一绝缘件配合的示意图；
图9为本申请实施例提供的另一个第一端部与第一绝缘件配合的示意图；
图10为本申请实施例提供的再一个第一端部与第一绝缘件配合的示意图；
图11为本申请实施例提供的再一个第一端部与第一绝缘件配合的示意图；
图12为本申请实施例提供的再一个第一端部与第一绝缘件配合的示意图；
图13为本申请实施例提供的再一个第一端部与第一绝缘件配合的示意图；
图14为本申请实施例提供的再一个第一端部与第一绝缘件配合的示意图；
图15为本申请实施例提供的再一个第一端部与第一绝缘件配合的示意图；
图16为本申请实施例提供的一个第二端部与第二绝缘件配合的示意图；
图17为本申请实施例提供的另一个第二端部与第二绝缘件配合的示意图。
图标：车辆1000，电池100，控制器200，马达300，箱体10，电池单体20，第一子箱体11，第二子箱体12，外壳21，电极组件22，电极端子25，壳体211，端盖212，第一绝缘件223，第一胶纸223a，第二胶纸223b，第一粘性区101，第一非粘性区102，第二粘性区103，第二非粘性区104，第一极片221，第一端部221a，第一功能区105，第一空箔区106，第一边缘105a，第二边缘105b，第三边缘106a，第四边缘106b，第二绝缘件224，第三胶纸224a，第四胶纸224b，第三粘性区107a，第三非粘性区107b，第四粘性区108a，第四非粘性区108b，第二极片222，第二端部222a。
具体实施方式
为使本申请实施例的目的、技术方案和优点更加清楚，下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
除非另有定义，本申请所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同；本申请中在申请的说明书中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限定本申请；本申请的说明书和权利要求书及上述附图说明中的术语“包括”和“具有”以及它们的任何变形，意图在于覆盖不排他的包含。本申请的说明书和权利要求书或上述附图中的术语“第一”、“第二”等是用于区别不同对象，而不是用于描述特定顺序或主次关系。
在本申请中提及“实施例”意味着，结合实施例描述的特定特征、结构或特性可以包含在本申请的至少一个实施例中。在说明书中的各个位置出现该短语并不一定均是指相同的实施例，也不是与其它实施例互斥的独立的或备选的实施例。本领域技术人员显式地和隐式地理解的是，本申请所描述的实施例可以与其它实施例相结合。
在本申请的描述中，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”、“附接”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，可以是两个元件内部的连通。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本申请中的具体含义。
本申请中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本申请中字符“/”，一般表示前后关联对象是一种“或”的关系。
本申请中出现的“多个”指的是两个以上(包括两个)，同理，“多组”指的是两组以上(包括两组)，“多片”指的是两片以上(包括两片)。
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。
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。
本申请实施例中，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。
电池单体可以但不限于为锂离子电池、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。
电池单体一般包括电极组件。电极组件包括正极、负极以及隔离件。在电池单体充放电过程中，活性离子(例如锂离子)在正极和负极之间往返嵌入和脱出。隔离件设置在正极和负极之间，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。
在一些实施例中，正极可以为正极片，正极片可以包括正极集流体以及设置在正极集流体至少一个表面的正极活性材料。
作为示例，正极集流体具有在其自身厚度方向相对的两个表面，正极活性材料设置在正极集流体相对的两个表面的任意一者或两者上。
作为示例，正极集流体可采用金属箔片或复合集流体。例如，作为金属箔片，可以采用表面镀银处理的铝、表面镀银处理的不锈钢、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)形成在高分子材料基材(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。但本申请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的传统材料。
在一些实施例中，负极可以为负极片，负极片可以包括负极集流体。
作为示例，负极集流体可采用金属箔片或复合集流体。例如，作为金属箔片，可以采用表面镀银处理的铝、表面镀银处理的不锈钢、不锈钢、铜、铝、镍、炭精电极、用碳、镍或钛等。
在一些实施例中，负极集流体具有在其自身厚度方向相对的两个表面，负极活性材料设置在负极集流体相对的两个表面中的任意一者或两者上。
作为示例，负极活性材料可采用本领域公知的用于电池的负极活性材料。作为示例，负极活性材料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。但本申请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的传统材料。这些负极活性材料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，隔离件为隔离膜。本申请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、聚丙烯及聚偏二氟乙烯，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负极之间，也可以附着在正负极的表面。
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和负极之间，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。电解质可以是液态的、凝胶态的或固态的。其中，液态电解质包括电解质盐和溶剂。
在一些实施方式中，电解质盐可以包括六氟磷酸锂、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，溶剂可以包括碳酸亚乙酯、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。
其中，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。
其中，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包括氧化物固体电解质(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，电极组件为卷绕结构。正极片、负极片卷绕成卷绕结构。
在一些实施方式中，电极组件为叠片结构。
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。
在一些实施方式中，外壳包括端盖和壳体，壳体设有开口，端盖封闭开口以形成用于容纳电极组件和电解质等物质的密闭空间。壳体可设有一个或多个开口。端盖也可设置一个或者多个。
在一些实施方式中，外壳上设置有至少一个电极端子，电极端子与电极组件的极耳电连接。电极端子可以与极耳直接连接，也可以通过转接件与极耳间接连接。电极端子可以设置于端盖上，也可以设置在壳体上。
在一些实施方式中，外壳上设置有防爆阀。防爆阀用于泄放电池单体的内部压力。
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，本申请实施例没有特别的限制。
本申请的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。
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。
电池具有能量密度高、环境污染小、功率密度大、使用寿命长、适应范围广、自放电系数小等突出的优点，是现今新能源发展的重要组成部分。
电池技术的发展要同时考虑多方面的设计因素，例如，能量密度、放电容量、充放电倍率等性能参数，另外，还需要考虑电池的装配效率。
本申请实施例公开的电池单体可以但不限用于车辆、船舶或飞行器等用电设备中。可以使用具备本申请公开的电池单体、电池等组成该用电设备的电源系统。
本申请实施例提供一种使用电池单体作为电源的用电设备，用电设备可以为但不限于手机、平板电脑、笔记本电脑、电动玩具、电动工具、电动自行车、电动摩托车、电动汽车、轮船、航天器等等。其中，电动玩具可以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，航天器可以包括飞机、火箭、航天飞机和宇宙飞船等等。
以下实施例为了方便说明，以本申请一实施例的一种用电设备为车辆1000为例进行说明。
请参照图1，图1为本申请第一实施例提供的车辆的示意图。车辆1000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、混合动力汽车或增程式汽车等。车辆1000的内部设置有电池100，电池 100可以设置在车辆1000的底部或头部或尾部。电池100可以用于车辆1000的供电，例如，电池100可以作为车辆1000的操作电源，用于车辆1000的电路系统，例如用于车辆1000的启动、导航和运行时的工作用电需求。
车辆1000还可以包括控制器200和马达300，控制器200用来控制电池100为马达300供电，例如，用于车辆1000的启动、导航和行驶时的工作用电需求。
在本申请一些实施例中，电池100不仅可以作为车辆1000的操作电源，还可以作为车辆1000的驱动电源，代替或部分地代替燃油或天然气为车辆1000提供驱动动力。
请参照图2，图2为本申请第一实施例提供的电池的爆炸图。电池100包括箱体10和电池单体20，电池单体20容纳于箱体10内。其中，箱体10用于为电池单体20提供容纳空间，箱体10可以采用多种结构。在一些实施例中，箱体10可以包括第一子箱体11和第二子箱体12，第一子箱体11与第二子箱体12相互盖合，第一子箱体11和第二子箱体12共同限定出用于容纳电池单体20的容纳空间。第二子箱体12可以为一端开口的空心结构，第一子箱体11可以为板状结构，第一子箱体11盖合于第二子箱体12的开口侧，以使第一子箱体11与第二子箱体12共同限定出容纳空间；第一子箱体11和第二子箱体12也可以是均为一侧开口的空心结构，第一子箱体11的开口侧盖合于第二子箱体12的开口侧。
在电池100中，电池单体20可以是多个，多个电池单体20之间可串联或并联或混联，混联是指多个电池单体20中既有串联又有并联。多个电池单体20之间可直接串联或并联或混联在一起，再将多个电池单体20构成的整体容纳于箱体10内；当然，电池100也可以是多个电池单体20先串联或并联或混联组成电池模块形式，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10内。电池100还可以包括其他结构，例如，该电池100还可以包括汇流部件，用于实现多个电池单体20之间的电连接。
其中，电池单体20可以为二次电池或一次电池；电池单体20还可以是锂硫电池、钠离子电池或镁离子电池，但不局限于此。
请参照图3，图3为本申请一些实施例提供的电池单体的爆炸图。如图3所示，电池单体20包括外壳21、电极组件22及电极端子25。外壳21包括壳体211和端盖212，壳体211具有开口，端盖212封闭开口，以将电池单体20的内部环境与外部环境隔绝。
壳体211是用于配合端盖212以形成电池单体20的内部环境的组件，其中，形成的内部环境可以用于容纳电极组件22、电解液以及其他部件。壳体211和端盖212可以是独立的部件。壳体211可以是多种形状和多种尺寸的。具体地，壳体211的形状可以根据电极组件22的具体形状和尺寸大小来确定。壳体211的材质可以是多种，比如，铜、铁、铝、不锈钢、铝合金、塑胶等。
端盖212是指盖合于壳体211的开口处以将电池单体20的内部环境隔绝于外部环境的部件。不限地，端盖212的形状可以与壳体211的形状相适应以配合壳体211。可选地，端盖212可以由具有一定硬度和强度的材质(如铝合金)制成，这样，端盖212在受挤压碰撞时就不易发生形变，使电池单体20能够具备更高的结构强度，可靠性也可以有所提高。端盖212上可以设置有如电极端子等的功能性部件。电极端子可以用于与电极组件22电连接，以用于输出或输入电池单体20的电能。端盖212的材质也可以是多种的，比如，铜、铁、铝、不锈钢、铝合金、塑胶等，本申请实施例对此不作特殊限制。在一些实施例中，在端盖212的内侧还可以设置有绝缘结构，绝缘结构可以用于隔离壳体211内的电连接部件与端盖212，以降低短路的风险。示例性的，绝缘结构可以是塑料、橡胶等。
电极组件22是电池单体20中发生电化学反应的部件。壳体211内可以包含一个或更多个电极组件22。电极组件22主要由正极极片和负极极片卷绕或层叠放置形成，并且通常在正极极片与负极极片之间设有隔离膜，隔离膜用于分隔正极极片和负极极片，以缓解正极极片和负极极片内接短路。正极极片和负极极片具有活性物质的部分构成电极组件的主体部，正极极片和负极极片不具有活性物质的部分各自构成极耳。正极极耳和负极极耳可以共同位于主体部的一端或是分别位于主体部的两端。在电池的充放电过程中，正极活性物质和负极活性物质与电解液发生反应，极耳连接电极端子以形成电流回路。
相关技术中，电极组件的极片的端部由于存在毛刺，因此需要保护层将端部包裹起来，从而降低毛刺外露的风险，从而减少了毛刺刺穿隔膜导致正负极片短路的现象。
一般来讲，保护层为两层胶带，且粘接于极片的端部在厚度方向的两侧，胶带包括基材以及粘性胶层，粘性胶层一般覆盖基材的整个表面；然而由于贴附工艺存在公差，两个胶带贴附在极片端部在厚度方向的两侧时，容易出现错误导致对不齐的问题发生，因此会出现粘性胶层露出的问题，甚至会导致溢胶、粘辊、脱胶、断带，甚至极片破损等问题，影响电芯单体的质量及安全。
为此，本申请提出了一种电池单体，该电池单体的可靠性可以得到提升。
根据本申请实施例的电池单体20包括外壳21和电极组件22。
外壳21可以为金属材质或非金属材质制成，外壳21可以围设出容纳空间。
电极组件22设置于外壳21内，也就是说，电极组件22可以容纳于上述的容纳空间内。
如图4-图15所示，电极组件22可以包括第一极片221，第一极片221可以为正极片或者负极片，本申请实施例在此处不做限定。
第一极片221在长度方向具有第一端部221a，可以理解的是，若电极组件22为卷绕式结构，则第一极片221的长度方向为第一极片221的卷绕方向。
第一极片221在长度方向(附图中用字母X表示)上的一端可以具有第一端部221a，第一极片221在长度方向上的两端也可以都具有第一端部221a。
若电极组件22为卷绕式结构，则第一端部221a可以为第一极片221的卷绕起始端或者卷绕收尾端。
电极组件22还包括第一绝缘件223，第一绝缘件223可以设置于第一端部221a，第一绝缘件223可以将第一端部221a上的毛刺遮挡，降低毛刺刺穿隔膜引起正负极短路的风险。
第一绝缘件223包括第一胶纸223a和第二胶纸223b，第一胶纸223a和第二胶纸223b分别粘接于第一端部221a在厚度方向上的两个侧面。
换言之，第一端部221a在厚度方向上的一个侧面贴附有第一胶纸223a，第一端部221a在厚度方向上的另一个侧面贴附有第二胶纸223b。
沿第一极片221的长度方向，第一胶纸223a和第二胶纸223b均超出第一端部221a，且超出第一端部221a的部分相互粘接。
也就是说，沿第一极片221的长度方向，第一胶纸223a和第二胶纸223b不会与第一端部221a平齐，而是超出第一端部221a，由此可以使得第一胶纸223a和第二胶纸223b不仅可以分别粘接于第一端部221a在厚度方向上的两个侧面，同时彼此可以粘接固定在一起。
第一胶纸223a包括涂覆有胶层的第一粘性区101和未涂覆有胶层的第一非粘性区102，沿第一极片221的宽度方向，第一非粘性区102位于第一胶纸223a的至少一端。
也就是说，第一胶纸223a的胶层不会涂满第一胶纸223a的基材表面，而是一部分区域未涂覆胶层从而形成第一非粘性区102。
沿第一极片221的宽度方向(附图中用字母Y表示)，第一非粘性区102位于第一胶纸223a的至少一端，也就是说，第一非粘性区102可以位于第一胶纸223a在宽度方向上的一端，或者第一非粘性区102可以位于第一胶纸223a在宽度方向上的两端。
由此，在第一胶纸223a和第二胶纸223b在第一极片221的宽度方向上由于贴附工艺无法对齐时，由于沿第一极片221宽度方向，第一非粘性区102设置于第一胶纸223a的至少一端，因此第一胶纸223a在第一极片221宽度方向上的至少一端不会漏胶，而是仅仅漏出没有粘性的第一非粘性区102。
例如，若第一非粘性区102设置于第一胶纸223a在宽度方向上的一端，至少第一胶纸223a沿第一极片221的宽度方向(且从第一粘性区101到第一非粘性区102)相对第二胶纸223b发生错位时，第一非粘性区102会漏出，而不会直接漏胶。
根据本申请实施例的电池单体20，由于沿所述第一极片221的宽度方向，第一非粘性区102位于所述第一胶纸223a的至少一端。因此，即使由于贴附工艺公差，导致第一胶纸223a和第二胶纸223b在第一极片221的宽度方向上产生错位，第一胶纸223a在第一极片221宽度方向上的至少一端不会漏胶，而是仅仅漏出没有粘性的第一非粘性区102。由此，降低了第一绝缘件223的漏胶几率，也降低了由于漏胶导致的粘辊、脱胶、断带，甚至极片破损等问题，进而提高了电池的可靠性。
根据本申请的一些实施例，如图8-图15所示，第一胶纸223a包括两个第一非粘性区102，沿第一极片221的宽度方向，两个第一非粘性区102分别位于第一胶纸223a的两端，第一粘性区101位于两个第一非粘性区102之间。
也就是说，沿第一极片221的宽度方向，一个第一非粘性区102与第一粘性区101的一端连接，另一个第一非粘性区102与第一粘性区101的另一端连接。
由此，即使由于贴附工艺公差，导致第一胶纸223a和第二胶纸223b在第一极片221的宽度方向上产生错位，第一胶纸223a在第一极片221宽度方向上的至少一端不会漏胶，而是仅仅漏出没有粘性的第一非粘性区102。由此，降低了第一绝缘件223的漏胶几率，也降低了由于漏胶导致的粘辊、脱胶、断带，甚至极片破损等问题，进而提高了电池的可靠性。
在本申请的一些实施例中，如图8-图15所示，第二胶纸223b包括涂覆有胶层的第二粘性区103以及未涂覆有胶层的第二非粘性区104，沿第一极片221的宽度方向，第一非粘性区102位于第二胶纸223b的至少一端。
也就是说，第二胶纸223b的胶层不会涂满第二胶纸223b的基材表面，而是一部分区域未涂覆胶层从而形成第二非粘性区104。
沿第一极片221的宽度方向，第二非粘性区104位于第二胶纸223b的至少一端，也就是说，第二非粘性区104可以位于第二胶纸223b在宽度方向上的一端，或者第二非粘性区104可以位于第二胶纸223b在宽度方向上的两端。
由此，即使由于贴附工艺公差，导致第二胶纸223b和第一胶纸223a在第一极片221的宽度方向上产生错位，第二胶纸223b在第一极片221宽度方向上的至少一端不会漏胶，而是仅仅漏出没有粘性的第二非粘性区104。由此，降低了第一绝缘件223的漏胶几率，也降低了由于漏胶导致的粘辊、脱胶、断带，甚至极片破损等问题，进而提高了电池的可靠性。
在本申请的一些实施例中，如图8-图15所示，第二胶纸223b包括两个第二非粘性区104，沿第一极片221的宽度方向，两个第二非粘性区104分别位于第二胶纸223b的两端，第二粘性区103位于两个第二非粘性区104之间。
也就是说，沿第一极片221的宽度方向，一个第二非粘性区104与第二粘性区103的一端连接，另一个第二非粘性区104与第二粘性区103的另一端连接。
由此，即使由于贴附工艺公差，导致第二胶纸223b和第一胶纸223a在第一极片221的宽度方向上产生错位，第二胶纸223b在第一极片221宽度方向上的至少一端不会漏胶，而是仅仅漏出没有粘性的第二非粘性区104。由此，降低了第一绝缘件223的漏胶几率，也降低了由于漏胶导致的粘辊、脱胶、断带，甚至极片破损等问题，进而提高了电池的可靠性。
在本申请的一些实施例中，第一胶纸223a包括两个第一非粘性区102，沿第一极片221的宽度方向，两个第一非粘性区102分别位于第一胶纸223a的两端，第一粘性区101位于两个第一非粘性区102之间。同时，第二胶纸223b包括两个第二非粘性区104，沿第一极片221的宽度方向，两个第二非粘性区104分别位于第二胶纸223b的两端，第二粘性区103位于两个第二非粘性区104之间。
即使由于贴附工艺公差，导致第二胶纸223b和第一胶纸223a在第一极片221的宽度方向上产生错位，第一胶纸223a和第二胶纸223b在第一极片221宽度方向上的两端都不会漏胶，而是仅仅漏出没有粘性的第一非粘性区102和第二非粘性区104。由此，降低了第一绝缘件223的漏胶几率，也降低了由于漏胶导致的粘辊、脱胶、断带，甚至极片破损等问题，进而提高了电池的可靠性。
根据本申请的一些实施例，如图8-图12、图14-图15所示，沿第一极片221的宽度方向，第一极片221包括涂覆有活性物质层的第一功能区105和未涂覆有活性物质层的第一空箔区106。
需要说明的是，本申请的第一空箔区106指的是，第一空箔区106在厚度方向上的两个侧面均未涂覆有活性物质层。
沿第一极片221的宽度方向，第一功能区105具有第一边缘105a和第二边缘105b。
第一粘性区101可以贴附于第一功能区105，第二粘性区103可以贴附于第一功能区105。
沿第一极片221的宽度方向，第一粘性区101超出第一边缘105a和第二边缘105b中的至少一个。
也就是说，沿第一极片221的宽度方向，第一粘性区101超出第一边缘105a或第二边缘105b，或者第一粘性区101超出第一边缘105a和第二边缘105b。
由此，第一粘性区101不仅可以粘接于第一功能区105，同时第一粘性区101超出第一功能区105的部分可以粘接在第一空箔区106或者第二胶纸223b上，从而提升了第一胶纸223a的连接稳固性。
沿第一极片221的宽度方向，第二粘性区103超出第一边缘105a和第二边缘105b中的至少一个。
也就是说，沿第一极片221的宽度方向，第二粘性区103超出第一边缘105a或第二边缘105b，或者第二粘性区103超出第一边缘105a和第二边缘105b。
由此，第二粘性区103不仅可以粘接于第一功能区105，同时第二粘性区103超出第一功能区105的部分可以粘接在第一空箔区106或者第一胶纸223a上，从而提升了第二胶纸223b的连接稳固性。
在本申请的一些实施例中，如图8-图11所示，沿第一极片221的宽度方向，第一粘性区101和第二粘性区103均超出第一边缘105a和第二边缘105b。
由此，第一粘性区101不仅可以粘接于第一功能区105，同时第一粘性区101超出第一功能区105的部分可以粘接在第一空箔区106或者第二胶纸223b上，从而提升了第一胶纸223a的连接稳固性；第二粘性区103不仅可以粘接于第一功能区105，同时第二粘性区103超出第一功能区105的部分可以粘接在空箔区或者第一胶纸223a上，从而提升了第二胶纸223b的连接稳固性。
在本申请的一些实施例中，如图13所示，沿第一极片221的宽度方向，第一极片221包括涂覆有活性物质的第一功能区105和未涂覆有活性物质的第一空箔区106；
沿第一极片221的宽度方向，第一功能区105具有第一边缘105a和第二边缘105b，第一粘性区101和第二粘性区103均未超出第一边缘105a和第二边缘105b。
由此，减少了第一绝缘件223对第一端部221a的遮挡，至少在一定程度上提高了电池单体20的能量密度。
根据本申请的一些实施例，如图8-图12、图15所示，沿第一极片221的宽度方向，第一空箔区106连接于第二边缘105b，第一空箔区106具有远离第一功能区105的第三边缘106a。
也就是说，沿第一极片221的宽度方向，第一空箔区106可以有一个，第二边缘105b连接有该一个第一空箔区106，第一边缘105a未连接有第一空箔区106，第一边缘105a可以为第一极片221在宽度方向上的一个边缘，第一边缘105a和第三边缘106a为第一端部221a在第一极片221宽度方向上的两个边缘。
沿第一极片221的宽度方向，第一胶纸223a超出第一边缘105a和第三边缘106a中的至少一个，和/或，第二胶纸223b超出第一边缘105a和第三边缘106a中的至少一个。
也就是说，沿第一极片221的宽度方向，第一胶纸223a超出第一边缘105a或第三边缘106a，或者第一胶纸223a超出第一边缘105a和第三边缘106a。
沿第一极片221的宽度方向，第二胶纸223b超出第一边缘105a或第三边缘106a，或者第二胶纸223b超出第一边缘105a和第三边缘106a。
沿第一极片221的宽度方向，第一胶纸223a上的第一粘性区101可以超出第一边缘105a或第三边缘106a，或者第一粘性区101可以超出第一边缘105a和第三边缘106a。当然，可以理解的是，沿第一极片221的宽度方向，第一胶纸223a的第一粘性区101也可以均不超过第一边缘105a和第三边缘106a。
沿第一极片221的宽度方向，第二胶纸223b上的第二粘性区103可以超出第一边缘105a或第三边缘106a，或者第一粘性区101可以超出第一边缘105a和第三边缘106a。当然，可以理解的是，沿第一极片221的宽度方向，第二胶纸223b的第二粘性区103也可以均不超过第一边缘105a和第三边缘106a。
根据本申请的一些实施例，如图9和图11所示，第一端部221a具有第四边缘106b，第四边缘106b可以为第一端部221a在第一极片221长度方向上的边缘。
沿第一极片221的长度方向，第一胶纸223a与第二胶纸223b均超出第四边缘106b，第一胶纸223a超出第四边缘106b的部分与第二胶纸223b超出第四边缘106b的部分彼此可以粘接在一起。
沿第一极片221的厚度方向，第三边缘106a与第四边缘106b的连接处位于第一非粘性区102和第二非粘性区104之间。
由此，第一空箔区106的边角(第三边缘106a和第四边缘106b的连接处)可以被第一非粘性区102和第二非粘性区104固定支撑，有效降低了第一极片221出现打折变形等问题的几率。
可以理解的是，第一非粘性区102的强度和第二非粘性区104的强度都要大于第一极片221的强度，因此第一非粘性区102和第二非粘性区104可以支撑第一极片221。
根据本申请的一些实施例，如图8所示，沿第一极片221的宽度方向，第一非粘性区102的尺寸为L0，满足：1mm≤L0≤6mm。
例如，沿第一极片221的宽度方向，第一非粘性区102的尺寸为1mm、1.5mm、2mm、2.5mm、3mm、3.5mm、4mm、4.5mm、5mm、5.5mm、6mm。
上述第一非粘性区102在第一极片221的宽度方向上的尺寸只是具体示例，并非对第一非粘性区102在第一极片221的宽度方向上的尺寸进行限定，任何满足上述范围的第一非粘性区102在第一极片221的宽度方向上的尺寸均在本申请的保护范围内。
由于第一非粘性区102在第一极片221的宽度方向上的尺寸满足上述范围，因此一方面，可以使得第一胶纸223a和第二胶纸223b在第一极片221的宽度方向上发生错位时，第一非粘性区102的宽度足够，第一胶纸223a的胶层不会露出；另一方面，也使得第一非粘性区102的尺寸不至于过大，导致第一粘性区101的尺寸不足，从而影响第一胶纸223a的粘接性能。
根据本申请的一些实施例，2mm≤L0≤4mm。例如，第一非粘性区102的尺寸为2mm、2.4mm、2.8mm、3.2mm、3.6mm、4mm。
由于第一非粘性区102在第一极片221的宽度方向上的尺寸满足上述范围，因此一方面，可以使得第一胶纸223a和第二胶纸223b在第一极片221的宽度方向上发生错位时，第一非粘性区102的宽度足够，进一步使得第一胶纸223a的胶层不会露出；另一方面，也进一步使得第一非粘性区102的尺寸不至于过大，导致第一粘性区101的尺寸不足，从而影响第一胶纸223a的粘接性能。
在本申请的一些实施例中，如图5所示，第一胶纸223a的最大厚度为t1，第二胶纸223b的最大厚度为t2，第一端部221a的最大厚度为t3，满足：t1≤t3，t2≤t3。
若第一端部221a不设置第一绝缘件223，则第一端部221a与其相邻的极片之间存在台阶，在电池单体20发生膨胀后，台阶的存在会导致其易与外壳21或相邻的极片区域接触产生应力集中，进而容易出现极片断裂的风险。
由于第一胶纸223a的最大厚度小于第一端部221a的最大厚度，即使第一胶纸223a与第一端部221a在厚度方向上的侧面之间形成台阶，该台阶也小于不设置第一绝缘件223时第一端部221a与相邻的极片区域之间的台阶高度，从而降低了由于台阶产生的应力集中，减小了由于应力集中导致的第一极片221出现碎裂的风险。同样的，由于第二胶纸223b的最大厚度小于第一端部221a的最大厚度，即使第二胶纸223b与第一端部221a在厚度方向上的侧面之间形成台阶，该台阶也小于不设置第一绝缘件223时第一端部221a与相邻的极片区域之间的台阶高度，从而降低了由于台阶产生的应力集中，减小了由于应力集中导致的第一极片221出现碎裂的风险。
在本申请的一些实施例中，t1+t2≤t3。
本申请实施例的第一胶纸223a和第二胶纸223b贴附于第一端部221a在厚度方向上的两个侧面，且第一胶纸223a的厚度和第二胶纸223b的厚度满足：t1+t2≤t3。
因此，即使第一胶纸223a和第二胶纸223b仍然会与第一端部221a在厚度方向的侧面之间形成台阶，但该台阶高度较小，且总是小于不设置第一绝缘件223时第一端部221a与相邻的极片区域之间的台阶高度，从而降低了由于台阶产生的应力集中，减小了由于应力集中导致的第一极片221出现碎裂的风险。
在本申请的一些实施例中，如图5所示，t1≤0.5t3，t2≤0.5t3。由此，进一步降低了第一胶纸223a与第一端部221a之间的台阶高度，降低了第二胶纸223b与第一端部221a之间的台阶高度。从而降低了由于台阶产生的应力集中，减小了第一极片221出现碎裂的破裂的风险。
需要说明的是，电极组件22为卷绕式结构时，若不设置第一绝缘件223，第一端部221a会与其相邻的内圈极片或者外圈极片之间产生台阶。
在本申请的一些实施例中，如图8所示，沿第一端部221a的厚度方向，第一绝缘件223的投影与第一端部221a的投影具有第一重叠区，沿第一极片221的长度方向，第一重叠区的最大尺寸为L1，满足：L1≤100mm。
例如，第一重叠区的最大尺寸L1可以为10mm、20mm、30mm、40mm、50mm、60mm、70mm、80mm、90mm、100mm。
上述第一重叠区的最大尺寸只是具体示例，并非对第一重叠区的最大尺寸进行限定，任何满足上述范围的第一重叠区的最大尺寸均在本申请的保护范围内。
由此，一方面，第一绝缘件223总是要与第一端部221a连接，至少覆盖第一端部221a的一部分，遮挡毛刺，降低毛刺刺穿隔膜的几率；另一方面，第一重叠区也不会过大，第一绝缘件223不会覆盖第一极片221的过多区域，从而兼顾了电池单体20的能量密度。
在本申请的一些实施例中，2mm≤L1≤15mm。例如，第一重叠区的最大尺寸为2mm、4mm、6mm、8mm、10mm、12mm、14mm、15mm。
上述第一重叠区的最大尺寸只是具体示例，并非对第一重叠区的最大尺寸进行限定，任何满足上述范围的第一重叠区的最大尺寸均在本申请的保护范围内。
由此，一方面，第一绝缘件223总是要与第一端部221a连接，至少覆盖第一端部221a的一部分，遮挡毛刺，进一步降低毛刺刺穿隔膜的几率；另一方面，第一重叠区也不会过大，第一绝缘件223不会覆盖第一极片221的过多区域，从而进一步兼顾了电池单体20的能量密度。
根据本申请的一些实施例，如图4和图6所示，第一极片221具有两个第一端部221a，两个第一端部221a分别位于第一极片221在长度方向上的两端，每个第一端部221a均设置有第一绝缘件223。
由此，第一极片221在长度方向上的两端均可以被第一绝缘件223保护，有效遮挡了第一极片221在长度方向上的两端的毛刺，降低了毛刺刺穿隔膜导致正负极片短路的风险，提升了电池的可靠性。
在本申请的一些实施例中，如图4-图7、图16-图17所示，电极组件22还包括第二极片222，第二极片222的极性与第一极片221的极性相反。
第二极片222为正极片和负极片中的一个，第一极片221为正极片和负极片中的另一个。
例如，第二极片222为负极片，则第一极片221为正极片；第二极片222为正极片，则第一极片221为负极片。
第二极片222在长度方向具有第二端部222a，可以理解的是，若电极组件22为卷绕式结构，则第二极片 222的长度方向为第二极片222的卷绕方向。
第二极片222在长度方向上的一端可以具有第二端部222a，第二极片222在长度方向上的两端也可以都具有第二端部222a。
若电极组件22为卷绕式结构，则第二端部222a可以为第二极片222的卷绕起始端或者卷绕收尾端。
电极组件22还包括第二绝缘件224，第二绝缘件224可以设置于第二端部222a，第二绝缘件224可以将第二端部222a上的毛刺遮挡，降低毛刺刺穿隔膜引起正负极短路的问题。
第二绝缘件224包括第三胶纸224a和第四胶纸224b，第三胶纸224a和第四胶纸224b分别粘接于第二端部222a在厚度方向上的两个侧面。
换言之，第二端部222a在厚度方向上的一个侧面贴附有第三胶纸224a，第二端部222a在厚度方向上的另一个侧面贴附有第四胶纸224b。
沿第二极片222的长度方向，第三胶纸224a和第四胶纸224b均超出第二端部222a，且超出第二端部222a的部分相互粘接。
也就是说，沿第二极片222的长度方向，第三胶纸224a和第四胶纸224b不会与第二端部222a平齐，而是超出第二端部222a，由此可以使得第三胶纸224a和第四胶纸224b不仅可以分别粘接于第二端部222a在厚度方向上的两个侧面，同时彼此可以粘接固定在一起。
第三胶纸224a包括涂覆有胶层的第三粘性区107a和未涂覆有胶层的第三非粘性区107b，沿第二极片222的宽度方向，第三非粘性区107b位于第三胶纸224a的至少一端。
也就是说，第三胶纸224a的胶层不会涂满第三胶纸224a的基材表面，而是一部分区域未涂覆胶层从而形成第三非粘性区107b。
沿第二极片222的宽度方向，第三非粘性区107b位于第三胶纸224a的至少一端，也就是说，第三非粘性区107b可以位于第三胶纸224a在宽度方向上的一端，或者第三非粘性区107b可以位于第三胶纸224a在宽度方向上的两端。
由此，在第三胶纸224a和第四胶纸224b在第二极片222的宽度方向上由于贴附工艺无法对齐时，由于沿第二极片222宽度方向，第三非粘性区107b设置于第三胶纸224a的至少一端，因此第三胶纸224a在第二极片222宽度方向上的至少一端不会漏胶，而是仅仅漏出没有粘性的第三非粘性区107b。
例如，若第三非粘性区107b设置于第三胶纸224a在宽度方向上的一端，至少第三胶纸224a沿第二极片222的宽度方向(从第三粘性区107a到第三非粘性区107b)相对第四胶纸224b发生移动错位时，第三非粘性区107b会漏出，而不会直接漏胶。
根据本申请的一些实施例，如图16-图17所示，第三胶纸224a包括两个第三非粘性区107b，沿第二极片222的宽度方向，两个第三非粘性区107b分别位于第三胶纸224a的两端，第三粘性区107a位于两个第三非粘性区107b之间。
也就是说，沿第二极片222的宽度方向，一个第三非粘性区107b与第三粘性区107a的一端连接，另一个第三非粘性区107b与第三粘性区107a的另一端连接。
由此，即使由于贴附工艺公差，导致第三胶纸224a和第四胶纸224b在第二极片222的宽度方向上产生错位，第三胶纸224a在第二极片222宽度方向上的至少一端不会漏胶，而是仅仅漏出没有粘性的第三非粘性区107b。由此，降低了第二绝缘件224的漏胶几率，也降低了由于漏胶导致的粘辊、脱胶、断带，甚至极片破损等问题，进而提高了电池的可靠性。
在本申请的一些实施例中，如图16-图17所示，第四胶纸224b包括涂覆有胶层的第四粘性区108a以及未涂覆有胶层的第四非粘性区108b，沿第二极片222的宽度方向，第四非粘性区108b位于第四胶纸224b的至少一端。
也就是说，第四胶纸224b的胶层不会涂满第四胶纸224b的基材表面，而是一部分区域未涂覆胶层从而形成第四非粘性区108b。
沿第二极片222的宽度方向，第四非粘性区108b位于第四胶纸224b的至少一端，也就是说，第四非粘性区108b可以位于第四胶纸224b在宽度方向上的一端，或者第四非粘性区108b可以位于第四胶纸224b在宽度方向上的两端。
由此，即使由于贴附工艺公差，导致第四胶纸224b和第三胶纸224a在第二极片222的宽度方向上产生错位，第四胶纸224b在第二极片222宽度方向上的至少一端不会漏胶，而是仅仅漏出没有粘性的第四非粘性区108b。由此，降低了第二绝缘件224的漏胶几率，也降低了由于漏胶导致的粘辊、脱胶、断带，甚至极片破损等问题，进而提高了电池的可靠性。
在本申请的一些实施例中，如图16-图17所示，第四胶纸224b包括两个第四非粘性区108b，沿第二极片222的宽度方向，两个第四非粘性区108b分别位于第四胶纸224b的两端，第四粘性区108a位于两个第四非粘性区108b之间。
也就是说，沿第二极片222的宽度方向，一个第四非粘性区108b与第四粘性区108a的一端连接，另一个第四非粘性区108b与第四粘性区108a的另一端连接。
由此，即使由于贴附工艺公差，导致第四胶纸224b和第三胶纸224a在第二极片222的宽度方向上产生错位，第四胶纸224b在第二极片222宽度方向上的至少一端不会漏胶，而是仅仅漏出没有粘性的第四非粘性区108b。由此，降低了第二绝缘件224的漏胶几率，也降低了由于漏胶导致的粘辊、脱胶、断带，甚至极片破损等问题，进而提高了电池的可靠性。
在本申请的一些实施例中，第三胶纸224a包括两个第三非粘性区107b，沿第二极片222的宽度方向，两个第三非粘性区107b分别位于第三胶纸224a的两端，第三粘性区107a位于两个第三非粘性区107b之间。同时，第四胶纸224b包括两个第四非粘性区108b，沿第二极片222的宽度方向，两个第四非粘性区108b分别位于第四胶纸224b的两端，第四粘性区108a位于两个第四非粘性区108b之间。
即使由于贴附工艺公差，导致第四胶纸224b和第三胶纸224a在第二极片222的宽度方向上产生错位，第三胶纸224a和第四胶纸224b在第二极片222宽度方向上的两端都不会漏胶，而是仅仅漏出没有粘性的第三非粘性区107b和第四非粘性区108b。由此，降低了第二绝缘件224的漏胶几率，也降低了由于漏胶导致的粘辊、脱胶、断带，甚至极片破损等问题，进而提高了电池的可靠性。
根据本申请的一些实施例，如图4和图7所示，第二极片222具有两个第二端部222a，两个第二端部222a分别位于第二极片222在长度方向上的两端，每个第二端部222a均设置有第二绝缘件224。
由此，第二极片222在长度方向上的两端均可以被第二绝缘件224保护，有效遮挡了第二极片222在长度方向上的两端的毛刺，降低了毛刺刺穿隔膜导致正负极片短路的风险，提升了电池的可靠性。
根据本申请的一些实施例，如图4、图6-图7所示，电极组件22为卷绕式结构，第一极片221的长度方向为第一极片221的卷绕方向。由此，第一端部221a可以为第一极片221的卷绕起始端或/和卷绕收尾端。
在第一端部221a位于多圈极片的最内圈时，沿卷绕方向，第一绝缘件223的一部分可以粘接于第一端部221a在厚度方向上的两个侧面，第一绝缘件223的另一部分超出第一端部221a，且卷绕成为多圈结构，多圈结构位于电极组件22的中心区域，从而可以在电极组件22发生膨胀时，起到支撑电极组件22的作用。
下面简单描述本申请实施例的电池100。
根据本申请实施例的电池100包括上述实施例的电池单体20，由于根据本申请实施例的电池100包括上述的电池单体20，因此提高了电池100的可靠性。
下面简单描述本申请实施例的用电设备。
根据本申请实施例的用电设备包括上述实施例的电池100，由于根据本申请实施例的用电设备包括上述的电池100，因此该用电设备的稳定性得到了提高，从而提升了用户的使用感受。
虽然已经参考优选实施例对本申请进行了描述，但在不脱离本申请的范围的情况下，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。本申请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 (24)

  1. 一种电池单体，包括：
    外壳：
    电极组件，设置于所述外壳内，所述电极组件包括：
    第一极片，所述第一极片在长度方向上具有第一端部；
    第一绝缘件，包括第一胶纸和第二胶纸，所述第一胶纸和所述第二胶纸分别粘接于所述第一端部在厚度方向上的两个侧面；
    沿所述第一极片的长度方向，所述第一胶纸和所述第二胶纸均超出所述第一端部，且超出所述第一端部的部分相互粘接；
    其中，所述第一胶纸包括涂覆有胶层的第一粘性区和未涂覆有胶层的第一非粘性区，沿所述第一极片的宽度方向，所述第一非粘性区位于所述第一胶纸的至少一端。
  2. 根据权利要求1所述的电池单体，其中，所述第一胶纸包括两个所述第一非粘性区，沿所述第一极片的宽度方向，两个所述第一非粘性区分别位于所述第一胶纸的两端，所述第一粘性区位于两个所述第一非粘性区之间。
  3. 根据权利要求1或2所述的电池单体，其中，所述第二胶纸包括涂覆有胶层的第二粘性区和未涂覆有胶层的第二非粘性区，沿所述第一极片的宽度方向，所述第二非粘性区位于所述第二胶纸的至少一端。
  4. 根据权利要求3所述的电池单体，其中，所述第二胶纸包括两个所述第二非粘性区，沿所述第一极片的宽度方向，两个所述第二非粘性区分别位于所述第二胶纸的两端，所述第二粘性区位于两个所述第二非粘性区之间。
  5. 根据权利要求3或4所述的电池单体，其中，沿所述第一极片的宽度方向，所述第一极片包括涂覆有活性物质层的第一功能区和未涂覆有活性物质层的第一空箔区；
    沿所述第一极片的宽度方向，所述第一功能区具有第一边缘和第二边缘；
    沿所述第一极片的宽度方向，所述第一粘性区超出所述第一边缘和所述第二边缘中的至少一个，和/或，所述第二粘性区超出所述第一边缘和所述第二边缘中的至少一个。
  6. 根据权利要求5所述的电池单体，其中，沿所述第一极片的宽度方向，所述第一粘性区和所述第二粘性区均超出所述第一边缘和所述第二边缘。
  7. 根据权利要求3或4所述的电池单体，其中，沿所述第一极片的宽度方向，所述第一极片包括涂覆有活性物质层的第一功能区和未涂覆有活性物质层的第一空箔区；
    沿所述第一极片的宽度方向，所述第一功能区具有第一边缘和第二边缘，所述第一粘性区和所述第二粘性区均未超出所述第一边缘和所述第二边缘。
  8. 根据权利要求5-7中任一项所述的电池单体，其中，沿所述第一极片的宽度方向，所述第一空箔区连接于所述第二边缘，所述第一空箔区具有远离所述第一功能区的第三边缘；
    沿所述第一极片的宽度方向，所述第一胶纸超出所述第一边缘和所述第三边缘中的至少一个，和/或，所述第二胶纸超出所述第一边缘和所述第三边缘中的至少一个。
  9. 根据权利要求8所述的电池单体，其中，所述第一端部具有第四边缘，沿所述第一极片的长度方向，所述第一胶纸与所述第二胶纸均超出所述第四边缘；
    沿所述第一极片的厚度方向，所述第三边缘与所述第四边缘的连接处位于所述第一非粘性区和所述第二非粘性区之间。
  10. 根据权利要求1-9任一项所述的电池单体，其中，沿所述第一极片的宽度方向，所述第一非粘性区的尺寸为L0，满足：1mm≤L0≤6mm。
  11. 根据权利要求1-9任一项所述的电池单体，其中，所述第一胶纸的最大厚度为t1，所述第二胶纸的最大厚度为t2，所述第一端部的最大厚度为t3，满足：t1≤t3，t2≤t3。
  12. 根据权利要求11所述的电池单体，其中，t1+t2≤t3。
  13. 根据权利要求12所述的电池单体，其中，t1≤0.5t3，t2≤0.5t3。
  14. 根据权利要求1-13任一项所述的电池单体，其中，沿所述第一端部的厚度方向，所述第一绝缘件的投影与所述第一端部的投影具有第一重叠区，沿所述第一极片的长度方向，所述第一重叠区的最大尺寸为L1，满足：L1≤100mm。
  15. 根据权利要求14所述的电池单体，其中，2mm≤L1≤15mm。
  16. 根据权利要求1-15任一项所述的电池单体，其中，所述第一极片具有两个所述第一端部，两个所述第一端部分别位于所述第一极片在长度方向上的两端，每个所述第一端部均设置有所述第一绝缘件。
  17. 根据权利要求1-16任一项所述的电池单体，其中，所述电极组件还包括：第二极片，所述第二极片为正极极片和负极极片中的一个，所述第一极片为所述正极极片和所述负极极片中的一个，所述第二极片在长度方向上具有第二端部；
    第二绝缘件，包括第三胶纸和第四胶纸，所述第三胶纸和所述第四胶纸分别粘接于所述第二端部在厚度方向上的两个侧面；
    沿所述第二极片的长度方向，所述第三胶纸和所述第四胶纸均超出所述第二端部，且超出所述第二端部的部分相互粘接；
    其中，所述第三胶纸包括涂覆有胶层的第三粘性区和未涂覆有胶层的第三非粘性区，沿所述第二极片的宽度方向，所述第三非粘性区位于所述第三胶纸的至少一端。
  18. 根据权利要求17所述的电池单体，其中，所述第三胶纸包括两个所述第三非粘性区，沿所述第二极片的宽度方向，两个所述第三非粘性区分别位于所述第三胶纸的两端，所述第三粘性区位于两个所述第三非粘性区之间。
  19. 根据权利要求17或18所述的电池单体，其中，所述第四胶纸包括涂覆有胶层的第四粘性区和未涂覆有胶层的第四非粘性区，沿所述第二极片的宽度方向，所述第四非粘性区位于所述第四胶纸的至少一端。
  20. 根据权利要求19所述的电池单体，其中，所述第四胶纸包括两个所述第四非粘性区，沿所述第二极片的宽度方向，两个所述第四非粘性区分别位于所述第四胶纸的两端，所述第四粘性区位于两个所述第四非粘性区之间。
  21. 根据权利要求17-20任一项所述的电池单体，其中，所述第二极片具有两个所述第二端部，两个所述第二端部分别位于所述第二极片在长度方向上的两端，每个所述第二端部均设置有所述第二绝缘件。
  22. 根据权利要求1-21任一项所述的电池单体，其中，所述电极组件为卷绕式结构，所述第一极片的长度方向为所述第一极片的卷绕方向。
  23. 一种电池，包括权利要求1-22中任一项所述的电池单体。
  24. 一种用电设备，包括权利要求1-22中任一项所述的电池单体或权利要求23所述的电池，所述电池单体或所述电池用于提供电能。
PCT/CN2024/105744 2024-05-13 2024-07-16 电池单体、电池和用电设备 Pending WO2025236397A1 (zh)

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