WO2023216727A1 - 电极组件、电池单体、电池和用电设备 - Google Patents

电极组件、电池单体、电池和用电设备 Download PDF

Info

Publication number
WO2023216727A1
WO2023216727A1 PCT/CN2023/083019 CN2023083019W WO2023216727A1 WO 2023216727 A1 WO2023216727 A1 WO 2023216727A1 CN 2023083019 W CN2023083019 W CN 2023083019W WO 2023216727 A1 WO2023216727 A1 WO 2023216727A1
Authority
WO
WIPO (PCT)
Prior art keywords
electrode assembly
separator
main body
negative electrode
positive electrode
Prior art date
Application number
PCT/CN2023/083019
Other languages
English (en)
French (fr)
Inventor
彭龙庆
唐怀超
李婷
Original Assignee
宁德时代新能源科技股份有限公司
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 宁德时代新能源科技股份有限公司 filed Critical 宁德时代新能源科技股份有限公司
Publication of WO2023216727A1 publication Critical patent/WO2023216727A1/zh

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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present disclosure relates to the field of battery technology, and in particular, to an electrode assembly, a battery cell, a battery and an electrical device.
  • the electrode assembly is the component in the battery cell where electrochemical reactions occur.
  • the electrode assembly is mainly formed by rolling or stacking a positive electrode sheet, a negative electrode sheet and a separator for isolation (electrical insulation) between the positive electrode sheet and the negative electrode sheet.
  • the portions of the positive electrode sheet and the negative electrode sheet containing active material constitute the main body part of the positive electrode sheet and the main body part of the negative electrode sheet respectively, and the parts of the positive electrode sheet and the negative electrode sheet without active material respectively constitute the positive electrode tab and the negative electrode tab.
  • a ceramic layer is coated on a base film such as polyethylene or polypropylene. During use, the ceramic layer is easy to fall off and powder, which may cause safety issues.
  • the purpose of the present disclosure is to provide an electrode assembly, a battery cell, a battery and an electrical device, which can improve the thermal stability of the separator compared to related technologies, thereby improving the safety performance of the battery.
  • a first aspect of the present disclosure provides an electrode assembly, including an electrode assembly body and an end protective layer.
  • the main body of the electrode assembly includes a main body of a positive electrode sheet, a main body of a negative electrode sheet and a separator for isolating the main body of the positive electrode sheet and the main body of the negative electrode sheet.
  • the separator is relative to the main body of the positive electrode sheet and the main body of the negative electrode sheet.
  • the main body of the negative electrode sheet protrudes outward, and the two ends of the separator along the first direction have non-contact surfaces that are not in contact with the main body of the positive electrode sheet and the main body of the negative electrode sheet; the end protective layer is provided on the main body of the electrode assembly along the first direction.
  • the two ends form an integrated structure with the main body of the electrode assembly.
  • the end protective layer includes a separator covering part.
  • the separator covering part covers at least part of the non-contact surface and is directly combined with the non-contact surface to form an integrated structure with the separator.
  • the end protective layer is disposed on both ends of the electrode assembly body along the first direction and forms an integrated structure with the electrode assembly body, and the end protective layer includes a separator covering portion, and the separator covering portion covers at least Part of the non-contact surface is directly combined with the non-contact surface to form an integrated structure with the separator.
  • the separator covering portion can increase the portion of the separator that protrudes outward relative to the main body of the positive electrode sheet and the main body of the negative electrode sheet (hereinafter also referred to as the protruding portion).
  • the separator coating part can resist the end surface of the main body of the positive electrode sheet and/or the main body of the negative electrode sheet along the first direction when the separator has a tendency to shrink inward during use, which is beneficial to Prevent or reduce the inward shrinkage of the separator, thereby also helping to maintain the thermal stability of the separator to maintain its performance of electrically insulating the main part of the positive electrode sheet and the main part of the negative electrode sheet, and also reduce the bending deformation or polarization of the electrode assembly after being inserted into the shell.
  • the plates are dislocated to improve the tightness of the electrode components, thereby improving the safety performance and battery energy density of the battery.
  • the end protective layer includes an inorganic coating layer or an organic-inorganic composite structure coating layer, and the inorganic coating layer or organic-inorganic composite structure coating layer forms an integrated structure with the main body of the electrode assembly.
  • the end protective layer includes an inorganic coating layer or an organic-inorganic composite structure coating layer
  • the inorganic coating layer or organic-inorganic composite structure coating layer forms a uniform, dense, high-strength and small-thickness film, which is conducive to effectively strengthening the main body of the electrode assembly. corresponding ends, thereby effectively preventing or reducing the inward shrinkage of the diaphragm, and reducing the bending deformation or pole piece dislocation of the electrode assembly after entering the shell.
  • the inorganic coating layer or the organic-inorganic composite structure coating layer is formed into an integrated structure by vapor deposition, spraying or sputtering.
  • an integrated inorganic coating layer or an organic-inorganic composite structure coating layer through vapor deposition, spraying or sputtering will help the coating layer to be uniform, dense and integral, and to be firmly bonded to the surface of the electrode assembly body.
  • nanoscale and micron-scale inorganic coatings or organic-inorganic composite structure coatings can be formed through vapor deposition, which is beneficial to film formation that is more uniform, dense, high-strength, and small in thickness, and is beneficial to inorganic coatings or organic-inorganic composite structures.
  • the coating layer is firmly integrated with the corresponding parts of the main body of the electrode assembly, effectively improving the strength of the protruding part of the diaphragm, which is more conducive to preventing the diaphragm from shrinking and reducing the bending deformation or pole piece dislocation of the electrode assembly after being inserted into the shell.
  • all non-contact surfaces are provided with a separator coating.
  • All non-contact surfaces are provided with a diaphragm coating, which is more conducive to strengthening the protruding part of the diaphragm, preventing the diaphragm from shrinking, and reducing the bending deformation or pole piece dislocation of the electrode assembly after being inserted into the shell.
  • the separator has a reinforcing layer at a non-contact surface where the separator cladding is disposed, the reinforcing layer being formed by distributing the material of the separator cladding from the non-contact surface toward an inner side of the separator.
  • the material of the separator covering part is distributed to the inside of the separator to form a reinforcement layer, which is conducive to strengthening the mechanical strength and thermal stability of the protruding part of the separator and making the combination between the separator covering part and the separator stronger. , which is more conducive to preventing the diaphragm from shrinking and reducing the bending deformation or pole piece dislocation of the electrode assembly after entering the shell.
  • separator cladding portions covering at least portions of the non-contact surfaces of at least partially adjacent separators at the same end are connected.
  • the protruding parts of adjacent diaphragms at the same end of the electrode assembly may all or partially have smaller gaps or even be connected.
  • This arrangement makes the local gaps of adjacent diaphragms smaller or the connected parts of the diaphragms covered.
  • the parts of the separator are integrated into one, so that the local gaps of the adjacent separators are small or the connecting parts are fully protected.
  • the strength of the separator is improved, and on the other hand, the main body of the positive electrode sheet or the main body of the negative electrode sheet inside the adjacent separator is protected.
  • the end face of the upper part forms a protection, which helps prevent the diaphragm from shrinking and reduces the bending deformation or pole piece dislocation of the electrode assembly after being inserted into the shell.
  • the end protective layer further includes: a positive electrode coating part, the positive electrode coating part covers at least part of the surface of both end surfaces of the positive electrode sheet main part along the first direction and is formed with the positive electrode sheet main part. Integrated structure; and/or a negative electrode coating part, the negative electrode coating part covers at least part of the two end surfaces of the negative electrode sheet main part along the first direction and forms an integrated structure with the negative electrode sheet main part.
  • the end protective layer also includes a positive electrode coating and/or a negative electrode coating, so that the electrode assembly has better structural stability and helps reduce bending deformation or deformation of the electrode assembly after being inserted into the shell.
  • the pole pieces are misaligned.
  • the separator coating is connected to the positive electrode coating and/or the negative electrode coating.
  • the separator coating part is connected to the positive electrode coating part and/or the negative electrode coating part, so that the electrode assembly has better structural stability, further improves the thermal stability of the separator, and reduces the bending deformation or deformation of the electrode assembly after being inserted into the shell.
  • the pole pieces are misaligned.
  • the end protective layer covers all surfaces of both end surfaces of the main body of the positive electrode sheet along the first direction; and/or the end protective layer covers both end surfaces of the main body of the negative electrode sheet along the first direction. the entire surface of the end face.
  • the end protective layer covers all surfaces of both end surfaces of the main body of the positive electrode sheet along the first direction; and/or the end protective layer covers all surfaces of both end surfaces of the main body of the negative electrode sheet along the first direction, so that the electrode assembly It has better structural stability, which helps reduce bending deformation or pole piece dislocation of the electrode assembly after being inserted into the shell.
  • the end protective layer has a thickness of 0.01 ⁇ m-100 ⁇ m.
  • the thickness of the end protective layer is 0.05 ⁇ m-5 ⁇ m.
  • Properly setting the thickness of the end protective layer can not only effectively protect the main body of the electrode assembly, but also prevent the waste of materials and processing time, save production costs and improve production efficiency.
  • a second aspect of the disclosure provides a battery cell, which includes the electrode assembly of the first aspect of the disclosure.
  • the battery cell of the present disclosure has the advantages of the electrode assembly of the present disclosure.
  • a third aspect of the disclosure provides a battery, which includes the battery cell of the second aspect of the disclosure.
  • the battery of the present disclosure has the advantages of the battery cell of the present disclosure.
  • a fourth aspect of the disclosure provides an electrical device.
  • the electrical device includes the battery of the third aspect of the disclosure, and the battery is used to provide power to the electrical device.
  • the electrical equipment of the present disclosure has the advantages of the battery of the present disclosure.
  • FIG. 1 is a schematic structural diagram of a vehicle as an electrical device according to an embodiment of the present disclosure.
  • Figure 2 is a schematic structural diagram of a battery according to an embodiment of the present disclosure.
  • FIG. 3 is a schematic diagram of the exploded structure of a battery cell in a battery according to an embodiment of the present disclosure.
  • FIG. 4 is a schematic structural diagram of an electrode assembly according to an embodiment of the present disclosure.
  • FIG. 5 is an enlarged structural schematic diagram of part E of the electrode assembly of the embodiment shown in FIG. 4 .
  • FIG. 6 is a schematic structural diagram of an electrode assembly according to an embodiment of the present disclosure.
  • FIG. 7 is a schematic diagram of the principle structure of an electrode assembly according to an embodiment of the present disclosure.
  • connection should be understood in a broad sense.
  • it can be a fixed connection or a removable connection.
  • the battery cells may include lithium ion secondary batteries, lithium ion primary batteries, lithium sulfur batteries, sodium lithium ion batteries, sodium ion batteries or magnesium ion batteries, etc., which are not limited in the embodiments of the present disclosure.
  • the battery cell may be in the shape of a cylinder, a flat body, a rectangular parallelepiped or other shapes, and the embodiments of the present disclosure are not limited thereto.
  • Battery cells are generally divided into three types according to packaging methods: cylindrical battery cells, square battery cells and soft-pack battery cells, and the embodiments of the present disclosure are not limited to this.
  • the battery mentioned in the embodiments of the present disclosure refers to a single physical module including one or more battery cells to provide higher voltage and capacity.
  • the battery mentioned in this disclosure may include a battery module or a battery pack, or the like.
  • Batteries generally include a box for packaging one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.
  • a battery cell mainly includes a battery core, a casing and an end cap assembly.
  • the battery core may include one or two or more electrode components.
  • the battery core is sealed in the accommodation space of the housing through the end cover of the end cover assembly, and the accommodation space is filled with electrolyte.
  • the casing is a component used to provide an accommodation space for accommodating the electrode assembly, electrolyte, and other components therein.
  • the housing can be of various shapes and sizes, such as cuboid, cylinder, hexagonal prism, etc. Specifically, the shape of the housing can be determined according to the specific shape and size of the electrode assembly.
  • the material of the shell can be selected from copper, iron, aluminum, stainless steel, aluminum alloy, plastic and other materials.
  • the end cap refers to a component that covers the opening of the casing to isolate the internal environment of the battery cell from the external environment.
  • the shape of the end cap can be adapted to the shape of the housing to fit the housing.
  • the end cap can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the end cap is less likely to deform when subjected to extrusion and collision, allowing the battery cell to have higher structural strength. Safety features could also be improved.
  • Functional components such as electrode terminals can be provided on the end cap.
  • the electrode terminal may be used to electrically connect with the electrode assembly for outputting or inputting electrical energy of the battery cell.
  • the end cap may also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell reaches a threshold value.
  • the pressure relief mechanism is, for example, an explosion-proof valve.
  • the housing and the end cover may be independent components.
  • the housing is provided with an opening, and the end cover covers the opening at the opening to form an internal environment of the battery cell.
  • the end cover and the shell can also be integrated.
  • the end cover and the shell can form a common connection surface before other components are installed into the shell.
  • an insulating member may also be provided inside the end cover, and the insulating member may Used to isolate electrical connection parts and end covers in the housing to reduce the risk of short circuits.
  • the insulating member may be an insulating plate, which may be made of plastic, rubber, or other materials.
  • the electrode assembly is arranged in the accommodation space of the housing.
  • the electrode assembly is the component in the battery cell where electrochemical reactions occur.
  • the electrode assembly includes a positive electrode sheet, a negative electrode sheet and a separator. Battery cells mainly rely on the movement of metal ions between the positive and negative electrodes to work.
  • the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer.
  • the positive electrode active material layer is coated on the surface of the positive electrode current collector.
  • the positive electrode current collector that is not coated with the positive electrode active material layer protrudes from the positive electrode current collector that is coated with the positive electrode active material layer. , the positive electrode current collector without coating the positive electrode active material layer is used as the positive electrode tab.
  • the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganate, etc.
  • the negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer.
  • the negative electrode active material layer is coated on the surface of the negative electrode current collector.
  • the negative electrode current collector that is not coated with the negative electrode active material layer protrudes from the negative electrode current collector that is coated with the negative electrode active material layer.
  • the negative electrode current collector that is not coated with the negative electrode active material layer is used as the negative electrode tab.
  • the material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon.
  • the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together.
  • the material of the separator can be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene), etc.
  • ceramic coating is usually performed on the base film of the separator.
  • the inventor found that the ceramic layer, especially the ceramic layer protruding from the separator of the pole piece, will fall off, crack or fall off due to collisions, impacts, etc. during actual use, causing the ceramic layer to fall off when the temperature inside the battery cell rises.
  • the separator in this area is still prone to significant shrinkage, causing the positive and negative electrodes to overlap each other, causing a short circuit or fire.
  • the inventor of the present disclosure has proposed an electrode assembly.
  • an end protective layer is provided.
  • the end protective layer can strengthen the separator and the positive electrode sheet. And/or the heat resistance of the non-contact part of the negative electrode sheet can prevent the separator from shrinking to a certain extent and improve the safety performance of the battery cell.
  • the thickness of the end protective layer is thin and will not have any impact on the energy density of the battery cell. Too much impact.
  • the present disclosure also provides a battery cell including the electrode assembly of the present disclosure, a battery including the battery cell of the present disclosure, and an electrical equipment including the battery of the present disclosure.
  • Power-consuming devices can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys and power tools, etc.
  • Vehicles can be fuel vehicles, gas vehicles or new energy vehicles, and new energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc.
  • spacecraft include aircraft, rockets, space shuttles, spaceships, etc.
  • electric toys include fixed Type or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc.
  • electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, for example, Electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, planers and more.
  • Electric drills Electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, planers and more.
  • vehicle D in some embodiments of the present disclosure as an example.
  • Figure 1 is a schematic structural diagram of a vehicle D provided by some embodiments of the present disclosure.
  • Vehicle D can be a fuel vehicle, a gas vehicle, or a new energy vehicle.
  • the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or a range-extended vehicle.
  • Vehicle D is provided with battery B inside, and battery B can be placed at the bottom, head, or tail of vehicle D. Battery B may be used to power vehicle D, for example, as the operating power source of vehicle D.
  • battery B can not only be used as an operating power source of vehicle D, but also can be used as a driving power source of vehicle D, replacing or partially replacing fuel or natural gas to provide driving power for vehicle D.
  • FIG. 2 is an exploded view of battery B provided by some embodiments of the present disclosure.
  • Battery B includes a case 1 and battery cells 20 accommodated in the case 1 .
  • the box body 1 includes a box shell 11 and a box cover 12 that is fastened to the box shell 11 .
  • the box body 1 is used to provide an accommodation space for the battery cells 20 .
  • the box 1 is a rectangular parallelepiped as a whole. In embodiments not shown in the figures, the box 1 can also be in other shapes, such as a cylinder.
  • battery B there are a plurality of battery cells 20 , and the plurality of battery cells 20 can be connected in series, in parallel, or in a mixed manner.
  • Mixed connection means that multiple battery cells 20 are connected in series and in parallel.
  • the plurality of battery cells 20 can be directly connected in series or in parallel or mixed together, and then the whole composed of the plurality of battery cells 20 is accommodated in the box 1 .
  • battery B may be composed of multiple battery cells 20 connected in series, parallel, or mixed to form a battery module 2 .
  • a plurality of battery modules 2 are connected in series, parallel or mixed to form a whole, and are accommodated in the box 1 .
  • Battery B may also include other structures.
  • battery B may also include a bus component for realizing electrical connections between multiple battery cells 20 .
  • an electrode assembly 23 including an electrode assembly body 231 and an end protective layer 234 .
  • the electrode assembly body 231 includes a positive electrode sheet main body 2311, a negative electrode sheet main body 2312, and a separator 2313 for isolating the positive electrode sheet main body 2311 and the negative electrode sheet main body 2312.
  • the separators 2313 protrude outward relative to the positive electrode tab main body 2311 and the negative electrode tab main body 2312 .
  • the end protective layers 234 are provided at both ends of the electrode assembly body 231 along the first direction X and form an integrated structure with the electrode assembly body 231 .
  • the end protective layer 234 includes a membrane covering portion 2341 that covers at least part of the non-contact surface 2313A and is directly bonded to the non-contact surface 2313A to form an integrated structure with the membrane 2313 .
  • direct bonding may be, for example, directly growing on the separator 2313 through vapor deposition or other methods, rather than indirect bonding through gluing or other means, to ensure the bonding strength of the separator coating 2341 and the separator 2313.
  • the electrode assembly 23 may be of a rolled structure. Among them, the strip-shaped positive electrode sheet, separator and negative electrode sheet are sequentially stacked and wound more than two times to form the electrode assembly 23, and the electrode assembly 23 may be flat.
  • the electrode assembly 23 can be directly rolled into a flat shape, so that the electrode assembly 23 has a roughly hexahedral structure, or it can be rolled into a hollow cylindrical structure first, and then flattened into a flat shape after being rolled.
  • the flat surface is approximately parallel to the winding axis and is the outer surface with the largest area.
  • a flat surface can be a relatively flat surface and does not need to be a pure plane.
  • the electrode assembly 23 may also have a laminated structure, that is, the electrode assembly 23 includes a plurality of positive electrode sheets and a plurality of negative electrode sheets, and the separator is disposed between the positive electrode sheets and the negative electrode sheets.
  • the positive electrode sheets and the negative electrode sheets are stacked.
  • the end protective layers 234 are disposed on both ends of the electrode assembly body 231 along the first direction Part 2341, the diaphragm covering part 2341 covers at least part of the non-contact surface 2313A and is directly combined with the non-contact surface 2313A to form an integrated structure with the diaphragm 2313.
  • the diaphragm covering part 2341 can improve the mechanical strength and thermal stability of the protruding part of the diaphragm 2313.
  • the separator covering part 2341 can resist the end surface of the positive electrode sheet main part 2311 and/or the negative electrode sheet main part 2312 along the first direction Shrinking inward is also beneficial to maintaining the thermal stability of the separator to maintain its ability to electrically insulate the main body part 2311 of the positive electrode piece 2312 from the main body part 2312 of the negative electrode piece. It can also reduce the bending deformation or pole piece of the electrode assembly 23 after being inserted into the shell. The dislocation improves the tightness of the electrode assembly 23, thereby improving the safety performance and battery energy density of the battery using the electrode assembly 23.
  • the separator covering part 2341 can prevent or reduce the inward shrinkage of the separator 2313, it is not necessary to provide a ceramic layer on the surface of the separator that is in contact with the main body part of the positive electrode sheet and the main body part of the negative electrode sheet, thereby reducing the volume of the electrode assembly 23 and reducing the cost.
  • the weight of the electrode assembly 23 reduces the cost of the electrode assembly 23 and helps improve the energy density of the battery where the electrode assembly 23 is located.
  • the diaphragm covering part 2341 is provided on the protruding part of the diaphragm with the ceramic layer in the related art for further protection, it will be helpful to prevent or reduce the ceramic layer on the protruding part of the diaphragm in the related art from falling off and cracking, and it will also help to improve the durability of the diaphragm 2313.
  • the mechanical strength and thermal stability of the protruding part are improved, thereby improving the safety performance of the battery using the electrode assembly.
  • the first direction X is the left-right direction of FIG. 4, FIG. 6 and FIG.
  • the end protective layer 234 includes an inorganic coating layer or an organic-inorganic composite structure coating layer, and the inorganic coating layer or organic-inorganic composite structure coating layer forms an integrated structure with the electrode assembly body 231 .
  • the end protective layer 234 includes an inorganic coating layer or an organic-inorganic composite structure coating layer
  • the inorganic coating layer or organic-inorganic composite structure coating layer forms a uniform, dense, high-strength, and small-thickness film, which is conducive to effectively strengthening the main body of the electrode assembly.
  • the corresponding end of the portion 231 can effectively prevent or reduce the inward shrinkage of the diaphragm 2313 and reduce the bending deformation or pole piece dislocation of the electrode assembly 23 after being inserted into the shell.
  • the inorganic coating layer may be, for example, at least one of aluminum oxide, silicon oxide, zirconium oxide, hafnium oxide, titanium oxide, magnesium oxide, zinc oxide, boehmite, aluminum hydroxide, magnesium hydroxide, and lithium fluoride.
  • the organic-inorganic composite structure coating layer can be formed by hybridization of organic and inorganic, or it can be arranged in layers. of.
  • the coating layer of the organic-inorganic composite structure is arranged in layers, it can be a combination of a single organic coating layer and a single inorganic coating layer, a single organic coating layer and multiple inorganic coating layers, or a combination of multiple organic coating layers and a single inorganic coating layer.
  • the coating layer is compounded or multiple organic coating layers are compounded with multiple inorganic coating layers.
  • the materials of each organic coating layer can be the same or different.
  • the materials of each inorganic coating layer The materials of the layers can be the same or different.
  • the inorganic coating layer or the organic-inorganic composite structure coating layer is formed into an integrated structure by vapor deposition, spraying or sputtering.
  • an integrated inorganic coating layer or an organic-inorganic composite structure coating layer through vapor deposition, spraying or sputtering can help the coating layer to be uniform, dense and integral, and to be firmly bonded to the surface of the electrode assembly body 231 .
  • nanoscale and micron-scale inorganic coatings or organic-inorganic composite structure coatings can be formed through vapor deposition, which is beneficial to film formation that is more uniform, dense, high-strength, and small in thickness, and is beneficial to inorganic coatings or organic-inorganic composite structures.
  • the coating layer is firmly integrated with the corresponding parts of the electrode assembly main body 231 to effectively improve the strength of the protruding part of the diaphragm 2313, which is more conducive to preventing the diaphragm from shrinking and reducing the bending deformation or pole piece of the electrode assembly 23 after being inserted into the shell. dislocation.
  • all non-contact surfaces 2313A are provided with a separator covering 2341 .
  • All non-contact surfaces 2313A are provided with a diaphragm covering portion 2341, which is more conducive to strengthening the protruding portion of the diaphragm 2313, preventing the diaphragm from shrinking, and reducing bending deformation or pole piece dislocation of the electrode assembly 23 after being inserted into the case.
  • the separator 2313 has a reinforcement layer 23131 at the non-contact surface 2313A where the separator covering portion 2341 is provided, and the reinforcement layer 23131 passes from the non-contact surface 2313A toward the separator.
  • the inner side of 2313 is formed from the material of the distribution membrane covering portion 2341.
  • the material of the diaphragm covering part 2341 is distributed to the inside of the diaphragm 2312 to form the reinforcement layer 23131, which is conducive to strengthening the mechanical strength and thermal stability of the protruding part of the diaphragm 2313, so that the diaphragm covering part 2341 and The connection of the diaphragm 2312 is stronger, which is more conducive to preventing the diaphragm from shrinking and reducing the bending deformation or pole piece dislocation of the electrode assembly 23 after being inserted into the shell.
  • the separator covering portions 2341 covering at least part of the non-contact surface 2313A of the same end of at least partially adjacent separators 2313 are connected.
  • the protruding portions of the adjacent diaphragms 2313 at the same end of the electrode assembly 23 may have small or partial gaps or even connected parts. This arrangement makes the local gaps of the adjacent diaphragms 2313 smaller or the parts that are connected.
  • the diaphragm covering part 2341 is formed into one body, thereby fully protecting the small local gaps or connecting parts of the adjacent diaphragms 2313. On the one hand, the strength of the diaphragm 2313 is improved, and on the other hand, it also protects the inner parts of the adjacent diaphragms 2313.
  • the end surface of the main body part 2311 of the positive electrode sheet or the main body part 2312 of the negative electrode sheet forms a protection, which helps prevent the separator from shrinking and reduces the bending deformation or pole piece dislocation of the electrode assembly 23 after being inserted into the case.
  • the end protective layer 234 further includes: a positive electrode coating part 2342 , the positive electrode coating part 2342 covers the positive electrode sheet main part 2311 along the first direction X. of two At least part of the surface of each end surface and forms an integrated structure with the positive electrode sheet main body 2311; and/or the negative electrode covering part 2343, the negative electrode covering part 2343 covers at least part of the two end surfaces of the negative electrode sheet main part 2312 along the first direction X surface and form an integrated structure with the main body portion 2312 of the negative electrode sheet.
  • the end protective layer 234 also includes a positive electrode coating part 2342 and/or a negative electrode coating part 2343, so that the electrode assembly 23 has better structural stability and helps to reduce the need for the electrode assembly 23 to be inserted into the case. Later, bending deformation or pole piece dislocation occurred.
  • the separator coating part 2341 is connected to the positive electrode coating part 2342 and/or the negative electrode coating part 2343 .
  • the separator covering part 2341 is connected to the positive electrode covering part 2342 and/or the negative electrode covering part 2343, so that the electrode assembly 23 has better structural stability, further improves the thermal stability of the separator, and reduces the occurrence of the electrode assembly after being inserted into the shell. Bending deformation or pole piece misalignment.
  • the end protection layer 234 covers all surfaces of both end surfaces of the positive electrode sheet main part 2311 along the first direction X; and/or the end protection layer The layer 234 covers the entire surface of both end surfaces of the negative electrode sheet main part 2312 along the first direction X.
  • the end protective layer 234 covers the entire surface of the two end surfaces of the positive electrode sheet main part 2311 along the first direction X; and/or the end protective layer 234 covers the two end surfaces of the negative electrode sheet main part 2312 along the first direction X.
  • the entire surface allows the electrode assembly 23 to have better structural stability, thereby helping to reduce bending deformation or pole piece dislocation after the electrode assembly is inserted into the shell.
  • the thickness of the end protective layer 234 is 0.01 ⁇ m-100 ⁇ m. In the electrode assembly 23 of some embodiments, the thickness of the end protective layer 234 is 0.05 ⁇ m-5 ⁇ m.
  • Properly setting the thickness of the end protective layer 234 can effectively protect the electrode assembly body 231 , prevent waste of materials and processing time, save production costs, and improve production efficiency.
  • the battery cell provided by the embodiment of the present disclosure includes the electrode assembly 23 of the embodiment of the present disclosure.
  • the battery cell of the embodiment of the present disclosure has the advantages of the electrode assembly 23 of the embodiment of the present disclosure.
  • the battery provided by the embodiment of the present disclosure includes the battery cell of the embodiment of the present disclosure.
  • the battery according to the embodiment of the present disclosure has the advantages of the battery cell according to the embodiment of the present disclosure.
  • the electrical equipment provided by the embodiment of the present disclosure includes the battery of the embodiment of the present disclosure, and the battery is used to provide power for the electrical equipment.
  • the electrical equipment according to the embodiments of the present disclosure has the advantages of the battery according to the embodiments of the present disclosure.
  • the structure of the electrode assembly 23 and the battery cell 20 in which the electrode assembly 23 is located in some embodiments of the present disclosure will be described below with reference to FIGS. 3 to 7 .
  • the battery cell 20 includes an end cap assembly 21 , a case 22 and two electrode assemblies 23 .
  • the end cap assembly 21 includes an end cap 211 , a first electrode terminal 212 , a second electrode terminal 213 , an explosion-proof valve 214 and an insulating plate 215 .
  • the end cap 211 is used to cooperate with the shell 22 to package the electrode assembly 23 between the end cap 211 and the shell. in the sealed accommodation space formed by the body 22.
  • the first electrode terminal 212 is a positive terminal; the second electrode terminal 213 is a negative terminal.
  • the positive terminal and the negative terminal can be electrically connected to the corresponding positive tab 232 and negative tab 233 of the electrode assembly 23 through connecting pieces (not shown) respectively.
  • the insulating plate 215 is arranged between the end cover 211 and the connecting piece to achieve insulation between the end cover 211 and each electrode assembly.
  • the electrode assembly 23 includes an electrode assembly body 231 , a positive electrode tab 232 , a negative electrode tab 233 and an end protective layer 234 .
  • the electrode assembly body 231 includes a positive electrode piece main body 2311 , a negative electrode piece main body 2312 and a separator 2313 .
  • the separator 2313 is used to isolate the positive electrode sheet main body 2311 and the negative electrode sheet main body 2312 to electrically insulate them.
  • the separator 2313 is provided between the positive electrode piece main body 2311 and the negative electrode piece main body 2312 or at the outermost side of the stacked electrode piece and the separator.
  • the main body part 2311 of the positive electrode sheet and the main body part 2312 of the negative electrode sheet are respectively the parts of the positive electrode sheet and the negative electrode sheet coated with the active material.
  • the positive electrode tab 232 and the negative electrode tab 233 are the portions of the positive electrode sheet and the negative electrode sheet that are not coated with active material, respectively.
  • the separators 2313 protrude outward relative to the positive electrode sheet main body 2311 and the negative electrode sheet main body 2312 . Both ends of the separator 2313 along the first direction
  • the end protective layers 234 are provided at both ends of the electrode assembly body 231 along the first direction X and form an integrated structure with the electrode assembly body 231 .
  • the end protective layer 234 includes a membrane covering portion 2341, which covers at least part of the non-contact surface 2313A and forms an integrated structure with the membrane 2313.
  • the end protective layer 234 includes an inorganic coating layer, and the inorganic coating layer and the electrode assembly main body 231 form an integrated structure.
  • the inorganic coating layer is formed into an integrated structure by vapor deposition and simultaneously forms an integrated structure with the electrode assembly main body 231 .
  • the entire non-contact surface 2313A is provided with a separator covering portion 2341 .
  • the diaphragm 2313 has a reinforcement layer 23131 at the non-contact surface 2313A where the diaphragm covering portion 2341 is provided.
  • Reinforcement layer 23131 is formed by distributing the material of membrane cladding 2341 from non-contact surface 2313A toward the inside of membrane 2313.
  • the reinforcement layer 23131 can be formed, for example, by permeating the raw material gas of the vapor deposition into the inside of the separator 2313 during the process of forming the inorganic coating layer by vapor deposition.
  • the end protective layer 234 also includes a positive electrode coating part 2342 and a negative electrode coating part 2343.
  • the positive electrode covering portion 2342 covers both end surfaces of the positive electrode sheet main body 2311 along the first direction X and forms an integrated structure with the positive electrode sheet main body 2311 .
  • the negative electrode covering portion 2343 covers both end surfaces of the negative electrode sheet main body 2312 along the first direction X and forms an integrated structure with the negative electrode sheet main body 2312 .
  • the separator coating portion 2341 is in contact with both the positive electrode coating portion 2342 and the negative electrode coating portion 2343 .
  • the end protective layer 234 covers the entire surface of the two end surfaces of the positive electrode sheet main part 2311 along the first direction X and the two end surfaces of the negative electrode sheet main part 2312 along the first direction X. The entire surface of the end face.
  • the thickness of the end protective layer 234 is 1 ⁇ m.
  • the end protective layer 234 includes a positive electrode coating 2342 .
  • the positive electrode covering portion 2342 covers both end surfaces of the positive electrode sheet main body 2311 along the first direction X and forms an integrated structure with the positive electrode sheet main body 2311 .
  • the separator covering part 2341 is in contact with the positive electrode covering part 2342.
  • the end protective layer 234 covers the entire surface of both end surfaces of the positive electrode sheet main body 2311 along the first direction X.
  • the two end surfaces of the negative electrode sheet main body 2321 along the first direction X are blocked by the ends of the two separators 2313 on both sides and are not covered with end protective layers.
  • the main difference between the electrode assembly 23 shown in FIG. 7 and the electrode assembly 23 shown in FIGS. 4 and 5 is that in the electrode assembly 23 shown in FIG. 7 , at least part of the same end of the adjacent diaphragm 2313 is non-contact.
  • the membrane covering portion 2341 covering the surface 2313A is in contact with each other.
  • the end protective layer 234 includes a positive electrode coating portion 2342 and a negative electrode coating portion 2343 .
  • the positive electrode covering portion 2342 covers both end surfaces of the positive electrode sheet main body 2311 along the first direction X and forms an integrated structure with the positive electrode sheet main body 2311 .
  • the negative electrode covering portion 2343 covers both end surfaces of the negative electrode sheet main body 2312 along the first direction X and forms an integrated structure with the negative electrode sheet main body 2312 .
  • the separator coating part 2341 is in contact with the positive electrode coating part 2342 and the negative electrode coating part 2342.
  • the end protective layer 234 covers the entire surface of both end surfaces of the positive electrode sheet main body 2311 along the first direction X.
  • FIGS. 4 to 7 respectively show a cross-section of some layers of an electrode assembly 23 (each positive electrode sheet main body, each negative electrode sheet main body and each separator can be referred to as a layer). Sectional structure.
  • some layers of the same electrode assembly 23 may have the structure shown in FIG. 4 , while another part of the layers may have the structure shown in FIG. 6 and/or FIG. 7 .
  • different cross-sections of the same layer of the same electrode assembly 23 may have the structures shown in FIGS. 4 to 7 , and so on.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Secondary Cells (AREA)

Abstract

本公开提供了一种电极组件、电池单体、电池和用电设备。电极组件包括电极组件主体和端部防护层。电极组件主体包括正极片主体部、负极片主体部和用于隔离正极片主体部和负极片主体部的隔膜，在电极组件主体的沿第一方向的两端，隔膜相对于正极片主体部和负极片主体部向外侧突出，隔膜的沿第一方向的两端具有与正极片主体部和负极片主体部无接触的非接触表面；端部防护层设置于电极组件主体的沿第一方向的两端并与电极组件主体形成一体结构，端部防护层包括隔膜包覆部，隔膜包覆部覆盖至少部分非接触表面并直接结合于非接触表面以与隔膜形成一体结构。

Description

电极组件、电池单体、电池和用电设备
相关申请的交叉引用
本申请要求享有于2022年05月13日提交的名称为“电极组件、电池单体、电池和用电设备”的中国专利申请202221145650.1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
本公开涉及电池技术领域，特别是涉及一种电极组件、电池单体、电池和用电设备。
背景技术
电极组件是电池单体中发生电化学反应的部件。电极组件主要由正极片、负极片和用于正极片和负极片隔离(电绝缘)的隔膜卷绕或层叠放置形成。正极片和负极片的具有活性物质的部分分别构成正极片主体部和负极片主体部，正极片和负极片的不具有活性物质的部分各自构成正极极耳和负极极耳。
为了提高电极组件的隔膜的耐热性能，相关技术中会在聚乙烯、聚丙烯等基膜上涂覆陶瓷层，在使用过程中陶瓷层容易脱落、掉粉，会引发安全问题。
发明内容
本公开的目的在于提供一种电极组件、电池单体、电池和用电设备，相对于相关技术可以提高隔膜的热稳定性，从而提高电池的安全性能。
本公开第一方面提供一种电极组件，包括电极组件主体和端部防护层。电极组件主体包括正极片主体部、负极片主体部和用于隔离正极片主体部和负极片主体部的隔膜，在电极组件主体的沿第一方向的两端，隔膜相对于正极片主体部和负极片主体部向外侧突出，隔膜的沿第一方向的两端具有与正极片主体部和负极片主体部无接触的非接触表面；端部防护层设置于电极组件主体的沿第一方向的两端并与电极组件主体形成一体结构，端部防护层包括隔膜包覆部，隔膜包覆部覆盖至少部分非接触表面并直接结合于非接触表面以与隔膜形成一体结构。
本公开的电极组件中，端部防护层设置于电极组件主体的沿第一方向的两端并与电极组件主体形成一体结构，且端部防护层包括隔膜包覆部，隔膜包覆部覆盖至少部分非接触表面并直接结合于非接触表面以与隔膜形成一体结构，该隔膜包覆部可以提高隔膜相对于正极片主体部和负极片主体部向外侧突出的部分(以下也称突出部 分)的机械强度和热稳定性，因隔膜包覆部可以在隔膜使用过程中有向内收缩的趋势时抵于正极片主体部和/或负极片主体部的沿第一方向的端面，利于防止或减少隔膜向内收缩，从而也利于维持隔膜的热稳定性以维持其使正极片主体部和负极片主体部电绝缘的性能，也能减少电极组件在入壳后发生弯折变形或极片错位，提高电极组件的紧密性，从而提升电池的安全性能和电池能量密度。
在一些实施例的电极组件中，端部防护层包括无机包覆层或有机无机复合结构包覆层，无机包覆层或有机无机复合结构包覆层与电极组件主体形成一体结构。
由于端部防护层包括无机包覆层或有机无机复合结构包覆层，无机包覆层或有机无机复合结构包覆层成膜均匀、致密、强度高、厚度小，利于有效强化电极组件主体部的相应端部，从而利于有效防止或减少隔膜向内收缩，减少电极组件在入壳后发生弯折变形或极片错位。
在一些实施例的电极组件中，无机包覆层或有机无机复合结构包覆层通过气相沉积、喷涂或溅射形成为一体结构。
通过气相沉积、喷涂或溅射等方式形成一体结构的无机包覆层或有机无机复合结构包覆层，利于包覆层均匀致密整体性强，与电极组件主体的表面结合牢固。例如，通过气相沉积可以形成纳米级及微米级的无机包覆层或有机无机复合结构包覆层，利于成膜更加均匀、致密、强度高、厚度小，利于无机包覆层或有机无机复合结构包覆层与电极组件主体部的相应部位牢固结合为一体，有效提高隔膜的突出部分的强度，更有利于防止隔膜内缩，减少电极组件在入壳后发生弯折变形或极片错位。
在一些实施例的电极组件中，全部非接触表面均设有隔膜包覆部。
全部非接触表面均设有隔膜包覆部更有利于强化隔膜的突出部分，防止隔膜内缩，减少电极组件在入壳后发生弯折变形或极片错位。
在一些实施例的电极组件中，隔膜的设置隔膜包覆部的非接触表面处具有强化层，强化层通过从非接触表面朝向隔膜的内侧分布隔膜包覆部的材料形成。
在形成隔膜包覆部时，使隔膜包覆部的材料向隔膜的内侧分布而形成强化层，利于加强隔膜的突出部分的机械强度和热稳定性，使隔膜包覆部与隔膜的结合更加牢固，从而更有利于防止隔膜内缩，减少电极组件在入壳后发生弯折变形或极片错位。
在一些实施例的电极组件中，至少部分相邻的隔膜的同一端的至少部分非接触表面上覆盖的隔膜包覆部相接。
由于隔膜的材料较软，电极组件的同一端的相邻隔膜的突出部分可能全部或局部间隙较小甚至相接，该设置使相邻的隔膜的局部间隙较小或相接的部分的隔膜包覆部形成一体，从而对相邻的隔膜的局部间隙较小或相接的部分整体防护，一方面提高了隔膜的强度，另一方面也对相邻的隔膜内侧的正极片主体部或负极片主体部的端面形成防护，利于防止隔膜内缩，减少电极组件在入壳后发生弯折变形或极片错位。
在一些实施例的电极组件中，端部防护层还包括：正极包覆部，正极包覆部覆盖正极片主体部的沿第一方向的两个端面的至少部分表面并与正极片主体部形成一体结构；和/或负极包覆部，负极包覆部覆盖负极片主体部的沿第一方向的两个端面的至少部分表面并与负极片主体部形成一体结构。
端部防护层除包括隔膜包覆部外，还包括正极包覆部和/或负极包覆部，使电极组件具有更好的结构稳定性，利于减少电极组件在入壳后发生弯折变形或极片错位。
在一些实施例的电极组件中，隔膜包覆部与正极包覆部和/或负极包覆部相接。
隔膜包覆部与正极包覆部和/或负极包覆部相接，使电极组件具有更好的结构稳定性，进一步提高隔膜的热稳定性，减少电极组件在入壳后发生弯折变形或极片错位。
在一些实施例的电极组件中，端部防护层覆盖正极片主体部的沿第一方向的两个端面的全部表面；和/或端部防护层覆盖负极片主体部的沿第一方向的两个端面的全部表面。
端部防护层覆盖正极片主体部的沿第一方向的两个端面的全部表面；和/或端部防护层覆盖负极片主体部的沿第一方向的两个端面的全部表面，使电极组件具有更好的结构稳定性，从而有利于减少电极组件在入壳后发生弯折变形或极片错位。
在一些实施例的电极组件中，端部防护层的厚度为0.01μm-100μm。
在一些实施例的电极组件中，端部防护层的厚度为0.05μm-5μm。
合理设置端部防护层的厚度，即能对电极组件主体形成有效防护，又能防止材料和加工时间浪费，节约生产成本、提高生产效率。
本公开第二方面提供一种电池单体，该电池单体包括本公开第一方面的电极组件。本公开的电池单体具有本公开的电极组件具有的优点。
本公开第三方面提供一种电池，该电池包括本公开第二方面的电池单体。本公开的电池具有本公开的电池单体具有的优点。
本公开第四方面提供一种用电设备，该用电设备包括本公开第三方面的电池，电池用于为用电设备提供电力。本公开的用电设备具有本公开的电池具有的优点。
通过以下参照附图对本公开的示例性实施例的详细描述，本公开的其它特征及其优点将会变得清楚。
附图说明
此处所说明的附图用来提供对本公开的进一步理解，构成本公开的一部分，本 公开的示意性实施例及其说明用于解释本公开，并不构成对本公开的不当限定。在附图中：
图1为本公开一实施例的作为用电设备的车辆的结构示意图。
图2为本公开一实施例的电池的结构示意图。
图3为本公开一实施例的电池中电池单体的分解结构示意图。
图4为本公开一实施例的电极组件的原理性结构示意图。
图5为图4所示实施例的电极组件的E部放大结构示意图。
图6为本公开一实施例的电极组件的原理性结构示意图。
图7为本公开一实施例的电极组件的原理性结构示意图。
在附图中，附图并未按照实际的比例绘制。
具体实施方式
下面将结合本公开实施例中的附图，对本公开实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本公开一部分实施例，而不是全部的实施例。以下对至少一个示例性实施例的描述实际上仅仅是说明性的，决不作为对本公开及其应用或使用的任何限制。基于本公开中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本公开保护的范围。
除非另外具体说明，否则在这些实施例中阐述的部件和步骤的相对布置、数字表达式和数值不限制本公开的范围。同时，应当明白，为了便于描述，附图中所示出的各个部分的尺寸并不是按照实际的比例关系绘制的。对于相关领域普通技术人员已知的技术、方法和设备可能不作详细讨论，但在适当情况下，所述技术、方法和设备应当被视为授权说明书的一部分。在这里示出和讨论的所有示例中，任何具体值应被解释为仅仅是示例性的，而不是作为限制。因此，示例性实施例的其它示例可以具有不同的值。应注意到：相似的标号和字母在下面的附图中表示类似项，因此，一旦某一项在一个附图中被定义，则在随后的附图中不需要对其进行进一步讨论。
在本公开的描述中，需要理解的是，使用“第一”、“第二”等词语来限定零部件，仅仅是为了便于对相应零部件进行区别，如没有另行声明，上述词语并没有特殊含义，因此不能理解为对本公开保护范围的限制。
在本公开的描述中，需要说明的是，除非另有说明，“多个”的含义是两个以上；术语“上”、“下”、“左”、“右”、“内”、“外”等指示的方位或位置关系仅是为了便于描述本公开和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本公开的限制。此外，术语“第一”、“第二”、“第三”等仅用于描述目的，而不能理解为指示或暗示相 对重要性。“垂直”并不是严格意义上的垂直，而是在误差允许范围之内。“平行”并不是严格意义上的平行，而是在误差允许范围之内。
下述描述中出现的方位词均为图中示出的方向，并不是对本公开的具体结构进行限定。在本公开的描述中，还需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是直接相连，也可以通过中间媒介间接相连。对于本领域的普通技术人员而言，可视具体情况理解上述术语在本公开中的具体含义。
本公开中，电池单体可以包括锂离子二次电池、锂离子一次电池、锂硫电池、钠锂离子电池、钠离子电池或镁离子电池等，本公开实施例对此并不限定。电池单体可呈圆柱体、扁平体、长方体或其它形状等，本公开实施例对此也不限定。电池单体一般按封装的方式分成三种：柱形电池单体、方形电池单体和软包电池单体，本公开实施例对此也不限定。
本公开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。例如，本公开中所提到的电池可以包括电池模块或电池包等。电池一般包括用于封装一个或多个电池单体的箱体。箱体可以避免液体或其他异物影响电池单体的充电或放电。
电池单体主要包括电芯、壳体和端盖组件，电芯可以包括一个或两个或更多个电极组件。电芯通过端盖组件的端盖封装于壳体的容纳空间内，容纳空间内加注电解液。
壳体是用于提供容纳空间以将电极组件、电解液以及其他部件容纳于其内的部件。壳体可以是多种形状和多种尺寸的，例如长方体形、圆柱体形、六棱柱形等。具体地，壳体的形状可以根据电极组件的具体形状和尺寸大小来确定。壳体的材质可以选择铜、铁、铝、不锈钢、铝合金、塑胶等材料。
端盖是指盖合于壳体的开口处以将电池单体的内部环境隔绝于外部环境的部件。端盖的形状可以与壳体的形状相适应以配合壳体。可选地，端盖可以由具有一定硬度和强度的材质(如铝合金)制成，这样，端盖在受挤压碰撞时就不易发生形变，使电池单体能够具备更高的结构强度，安全性能也可以有所提高。端盖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电连接，以用于输出或输入电池单体的电能。在一些实施例中，端盖上还可以设置有用于在电池单体的内部压力或温度达到阈值时泄放内部压力的泄压机构。泄压机构例如为防爆阀。
壳体和端盖可以是独立的部件，壳体上设置有开口，通过在开口处使端盖盖合开口以形成电池单体的内部环境。不限地，也可以使端盖和壳体一体化，具体地，端盖和壳体可以在将其他部件装入壳前先形成一个共同的连接面，当需要封装壳体的内部时，再使端盖盖合壳体，并将壳体和端盖封装为一体。
在一些实施例的电池单体中，在端盖的内侧还可以设置有绝缘件，绝缘件可以 用于隔离壳体内的电连接部件与端盖，以降低短路的风险。示例性的，绝缘件例如可以为绝缘板，可以由塑料、橡胶等材料制造。
电极组件设置于壳体的容纳空间内。电极组件是电池单体中发生电化学反应的部件。电极组件包括正极片、负极片和隔膜。电池单体主要依靠金属离子在正极片和负极片之间移动来工作。正极片包括正极集流体和正极活性物质层，正极活性物质层涂覆于正极集流体的表面，未涂敷正极活性物质层的正极集流体凸出于已涂覆正极活性物质层的正极集流体，未涂敷正极活性物质层的正极集流体作为正极极耳。以锂离子电池为例，正极集流体的材料可以为铝，正极活性物质可以为钴酸锂、磷酸铁锂、三元锂或锰酸锂等。负极片包括负极集流体和负极活性物质层，负极活性物质层涂覆于负极集流体的表面，未涂敷负极活性物质层的负极集流体凸出于已涂覆负极活性物质层的负极集流体，未涂敷负极活性物质层的负极集流体作为负极极耳。负极集流体的材料可以为铜，负极活性物质可以为碳或硅等。为了保证通过大电流而不发生熔断，正极极耳的数量为多个且层叠在一起，负极极耳的数量为多个且层叠在一起。隔膜的材质可以为PP(polypropylene，聚丙烯)或PE(polyethylene，聚乙烯)等。
相关技术中为了提高隔膜耐热性能，通常会在隔膜的基膜上再进行陶瓷涂覆。发明人发现陶瓷层，尤其是突出于极片的隔膜上的陶瓷层会因为实际使用过程中的碰撞、冲击等脱落、开裂或掉粉，使得当电池单体内的温度升高时，陶瓷层脱落区域的隔膜还是容易发生明显收缩，从而导致正极片和负极片相互搭接，进而引发短路或起火。
本公开的发明人提出了一种电极组件，相对于以上相关技术而言，设置了端部防护层，采用该电极组件的电池单体内温度较高时，端部防护层可以增强隔膜与正极片和/或负极片不接触的部分的耐热性能，在一定程度上阻止隔膜收缩，提高电池单体的安全性能，且端部防护层的厚度较薄，对电池单体的能量密度不会产生太大影响。进一步地，本公开还提供一种包括本公开的电极组件的电池单体、一种包括本公开的电池单体的电池及一种包括本公开的电池的用电设备。
本申请实施例描述的技术方案适用于电池以及使用电池的用电设备。
用电设备可以是车辆、手机、便携式设备、笔记本电脑、轮船、航天器、电动玩具和电动工具等等。车辆可以是燃油汽车、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；航天器包括飞机、火箭、航天飞机和宇宙飞船等等；电动玩具包括固定式或移动式的电动玩具，例如，游戏机、电动汽车玩具、电动轮船玩具和电动飞机玩具等等；电动工具包括金属切削电动工具、研磨电动工具、装配电动工具和铁道用电动工具，例如，电钻、电动砂轮机、电动扳手、电动螺丝刀、电锤、冲击电钻、混凝土振动器和电刨等等。本申请实施例对上述用电设备不做特殊限制。
下面结合附图和实施例对本公开的实施方式作进一步详细描述。以下实施例的详细描述和附图用于示例性地说明本公开的原理，但不能用来限制本公开的范围，即 本公开不限于所描述的实施例。
为了方便说明，以下以本公开一些实施例的一种用电设备—车辆D为例进行说明。
请参照图1。图1为本公开一些实施例提供的车辆D的结构示意图。车辆D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D的内部设置有电池B，电池B可以设置在车辆D的底部或头部或尾部。电池B可以用于车辆D的供电，例如，可以作为车辆D的操作电源。
在本公开一些实施例中，电池B不仅可以作为车辆D的操作电源，还可以作为车辆D的驱动电源，代替或部分地代替燃油或天然气为车辆D提供驱动动力。
请参照图2，图2为本公开一些实施例提供的电池B的爆炸图。
电池B包括箱体1和容纳于箱体1内的电池单体20。其中，箱体1包括箱壳11和扣合于箱壳11上的箱盖12，箱体1用于为电池单体20提供容纳空间。以上实施例中，箱体1整体为长方体，在未图示的实施例中，箱体1也可以为其它形状，如圆柱体。
在电池B中，电池单体20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1内。
如图2所示，电池B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2。多个电池模块2再串联或并联或混联形成一个整体，并容纳于箱体1内。电池B还可以包括其他结构，例如，该电池B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。
如图4至图7所示，本公开实施例提供一种电极组件23，包括电极组件主体231和端部防护层234。电极组件主体231包括正极片主体部2311、负极片主体部2312和用于隔离正极片主体部2311和负极片主体部2312的隔膜2313。在电极组件主体231的沿第一方向X(对应于图4、图6、图7的左右方向)的两端，隔膜2313相对于正极片主体部2311和负极片主体部2312向外侧突出。隔膜2313的沿第一方向X的两端具有与正极片主体部2311和负极片主体部2312无接触的非接触表面2313A。端部防护层234设置于电极组件主体231的沿第一方向X的两端并与电极组件主体231形成一体结构。端部防护层234包括隔膜包覆部2341，隔膜包覆部2341覆盖至少部分非接触表面2313A并直接结合于非接触表面2313A以与隔膜2313形成一体结构。
可选地，直接结合例如可以是通过气相沉积等方式直接生长在隔膜2313上，而不是通过胶粘等方式间接结合，以保证隔膜包覆层2341和隔膜2313的结合强度。
电极组件23可以为卷绕式结构。其中，将带状的正极片、隔膜以及负极片依次层叠并卷绕两圈以上形成电极组件23，并且电极组件23可以呈扁平状。在电极组件 23制作时，电极组件23可直接卷绕为扁平状，使电极组件23大致为六面体结构，也可以先卷绕成中空的圆柱形结构，卷绕之后再压平为扁平状。扁平面大致平行于卷绕轴线且为面积最大的外表面。扁平面可以是相对平整的表面，并不要求是纯平面。
电极组件23也可为叠片式结构，即电极组件23中包括多个正极片以及多个负极片，隔膜设置在正极片和负极片之间。正极片和负极片层叠设置。
本公开实施例的电极组件23中，端部防护层234设置于电极组件主体231的沿第一方向X的两端并与电极组件主体231形成一体结构，且端部防护层234包括隔膜包覆部2341，隔膜包覆部2341覆盖至少部分非接触表面2313A并直接结合于非接触表面2313A以与隔膜2313形成一体结构，隔膜包覆部2341可以提高隔膜2313的突出部分的机械强度和热稳定性，因隔膜包覆部2341可以在隔膜使用过程中有向内收缩的趋势时抵于正极片主体部2311和/或负极片主体部2312的沿第一方向X的端面，利于防止或减少隔膜2313向内收缩，从而也利于维持隔膜的热稳定性以维持其使正极片主体部2311和负极片主体部2312电绝缘的性能，也能减少电极组件23在入壳后发生弯折变形或极片错位，提高电极组件23的紧密性，从而提升采用该电极组件23的电池的安全性能和电池能量密度。
由于隔膜包覆部2341可实现防止或减少隔膜2313向内收缩，可以选择无需对隔膜的与正极片主体部和负极片主体部接触的表面设陶瓷层，从而可以减少电极组件23的体积，降低电极组件23的重量，降低电极组件23的成本，利于提高电极组件23所在的电池的能量密度。
如果在相关技术的具有陶瓷层的隔膜的突出部分上设置隔膜包覆部2341作进一步防护，利于防止或减少相关技术中隔膜凸出部分上的陶瓷层脱落、开裂等，也利于提高隔膜2313的突出部分的机械强度和热稳定性，从而提高采用该电极组件的电池的安全性能。
其中，第一方向X在图4、图6和图7所示的实施例中，为图4、图6和图7的左右方向。
在一些实施例的电极组件23中，端部防护层234包括无机包覆层或有机无机复合结构包覆层，无机包覆层或有机无机复合结构包覆层与电极组件主体231形成一体结构。
由于端部防护层234包括无机包覆层或有机无机复合结构包覆层，无机包覆层或有机无机复合结构包覆层成膜均匀、致密、强度高、厚度小，利于有效强化电极组件主体部231的相应端部，从而利于有效防止或减少隔膜2313向内收缩，减少电极组件23在入壳后发生弯折变形或极片错位。
无机包覆层例如可以为氧化铝、氧化硅、氧化锆、氧化铪、氧化钛、氧化镁、氧化锌、勃姆石、氢氧化铝、氢氧化镁、氟化锂中的至少一种。
有机无机复合结构包覆层可以是有机和无机杂化形成的，也可以是分层设置 的。有机无机复合结构包覆层分层设置时，可以是单个有机包覆层与单个无机包覆层复合、单个有机包覆层与多个无机包覆层复合、多个有机包覆层与单个无机包覆层复合或多个有机包覆层与多个无机包覆层复合。有机无机复合结构包覆层包括多个有机包覆层时，各有机包覆层的材料可以相同，也可以不同，有机无机复合结构包覆层包括多个无机包覆层时，各无机包覆层的材料可以相同，也可以不同。
在一些实施例的电极组件23中，无机包覆层或有机无机复合结构包覆层通过气相沉积、喷涂或溅射形成为一体结构。
通过气相沉积、喷涂或溅射等方式形成一体结构的无机包覆层或有机无机复合结构包覆层，利于包覆层均匀致密整体性强，与电极组件主体231的表面结合牢固。例如，通过气相沉积可以形成纳米级及微米级的无机包覆层或有机无机复合结构包覆层，利于成膜更加均匀、致密、强度高、厚度小，利于无机包覆层或有机无机复合结构包覆层与电极组件主体部231的相应部位牢固结合为一体，有效提高隔膜2313的突出部分的强度，更有利于防止隔膜内缩，减少电极组件23在入壳后发生弯折变形或极片错位。
如图4和图7所示，在一些实施例的电极组件23中，全部非接触表面2313A均设有隔膜包覆部2341。
全部非接触表面2313A均设有隔膜包覆部2341更有利于强化隔膜2313的突出部分，防止隔膜内缩，减少电极组件23在入壳后发生弯折变形或极片错位。
如图4至图7所示，在一些实施例的电极组件23中，隔膜2313的设置隔膜包覆部2341的非接触表面2313A处具有强化层23131，强化层23131通过从非接触表面2313A朝向隔膜2313的内侧分布隔膜包覆部2341的材料形成。
在形成隔膜包覆部2341时，使隔膜包覆部2341的材料向隔膜2312的内侧分布形成强化层23131，利于加强隔膜2313的突出部分的机械强度和热稳定性，使隔膜包覆部2341与隔膜2312的结合更加牢固，从而更有利于防止隔膜内缩，减少电极组件23在入壳后发生弯折变形或极片错位。
如图6所示，在一些实施例的电极组件23中，至少部分相邻的隔膜2313的同一端的至少部分非接触表面2313A上覆盖的隔膜包覆部2341相接。
由于隔膜2313的材料较软，电极组件23的同一端的相邻隔膜2313的突出部分可能全部或局部间隙较小甚至相接，该设置使相邻的隔膜2313的局部间隙较小或相接的部分的隔膜包覆部2341形成一体，从而对相邻的隔膜2313的局部间隙较小或相接的部分整体防护，一方面提高了隔膜2313的强度，另一方面也对相邻的隔膜2313内侧的正极片主体部2311或负极片主体部2312的端面形成防护，利于防止隔膜内缩，减少电极组件23在入壳后发生弯折变形或极片错位。
如图4至图7所示，在一些实施例的电极组件23中，端部防护层234还包括：正极包覆部2342，正极包覆部2342覆盖正极片主体部2311的沿第一方向X的两 个端面的至少部分表面并与正极片主体部2311形成一体结构；和/或负极包覆部2343，负极包覆部2343覆盖负极片主体部2312的沿第一方向X的两个端面的至少部分表面并与负极片主体部2312形成一体结构。
端部防护层234除包括隔膜包覆部2341外，还包括正极包覆部2342和/或负极包覆部2343，使电极组件23具有更好的结构稳定性，利于减少电极组件23在入壳后发生弯折变形或极片错位。
如图4至图7所示，在一些实施例的电极组件23中，隔膜包覆部2341与正极包覆部2342和/或负极包覆部2343相接。
隔膜包覆部2341与正极包覆部2342和/或负极包覆部2343相接，使电极组件23具有更好的结构稳定性，进一步提高隔膜的热稳定性，减少电极组件在入壳后发生弯折变形或极片错位。
如图4至图7所示，在一些实施例的电极组件23中，端部防护层234覆盖正极片主体部2311的沿第一方向X的两个端面的全部表面；和/或端部防护层234覆盖负极片主体部2312的沿第一方向X的两个端面的全部表面。
端部防护层234覆盖正极片主体部2311的沿第一方向X的两个端面的全部表面；和/或端部防护层234覆盖负极片主体部2312的沿第一方向X的两个端面的全部表面，使电极组件23具有更好的结构稳定性，从而有利于减少电极组件在入壳后发生弯折变形或极片错位。
在一些实施例的电极组件23中，端部防护层234的厚度为0.01μm-100μm。在一些实施例的电极组件23中，端部防护层234的厚度为0.05μm-5μm。
合理设置端部防护层234的厚度，即能对电极组件主体231形成有效防护，又能防止材料和加工时间浪费，节约生产成本、提高生产效率。
本公开实施例提供的电池单体包括本公开实施例的电极组件23。本公开实施例的电池单体具有本公开实施例的电极组件23具有的优点。
本公开实施例提供的电池包括本公开实施例的电池单体。本公开实施例的电池具有本公开实施例的电池单体具有的优点。
本公开实施例提供的用电设备包括本公开实施例的电池，该电池用于为用电设备提供电力。本公开实施例的用电设备具有本公开实施例的电池具有的优点。
以下结合图3至图7说明本公开一些实施例的电极组件23及电极组件23所在的电池单体20的结构。
如图3所示，电池单体20包括端盖组件21、壳体22和两个电极组件23。
端盖组件21包括端盖211、第一电极端子212、第二电极端子213、防爆阀214和绝缘板215。端盖211用于与壳体22配合以将电极组件23封装于端盖211和壳 体22形成的密闭的容纳空间内。第一电极端子212为正极端子；第二电极端子213为负极端子。正极端子和负极端子可以分别通过连接片(未图示)与对应的电极组件23的正极极耳232和负极极耳233电连接。绝缘板215布置于端盖211与连接片之间，用于实现端盖211与各电极组件之间的绝缘。
结合图3至图7，电极组件23包括电极组件主体231、正极极耳232、负极极耳233和端部防护层234。
如图4所示，电极组件主体231包括正极片主体部2311、负极片主体部2312和隔膜2313。隔膜2313用于隔离正极片主体部2311和负极片主体部2312使二者电绝缘。隔膜2313设置于正极片主体部2311和负极片主体部2312之间或设置于层叠的极片和隔膜的最外侧。其中正极片主体部2311和负极片主体部2312分别为正极片和负极片的涂覆活性物质的部分。正极极耳232和负极极耳233分别为正极片和负极片的未涂覆活性物质的部分。
如图4所示，在电极组件主体231的沿第一方向X的两端，隔膜2313相对于正极片主体部2311和负极片主体部2312向外侧突出。隔膜2313的沿第一方向X的两端具有与正极片主体部2311和负极片主体部2312无接触的非接触表面2313A。
如图4所示，端部防护层234设置于电极组件主体231的沿第一方向X的两端并与电极组件主体231形成一体结构。其中，端部防护层234包括隔膜包覆部2341，隔膜包覆部2341覆盖至少部分非接触表面2313A并与隔膜2313形成一体结构。
端部防护层234包括无机包覆层，无机包覆层与电极组件主体231形成一体结构。无机包覆层通过气相沉积形成为一体结构同时与电极组件主体231形成一体结构。
如图4所示的电极组件23中，全部非接触表面2313A均设有隔膜包覆部2341。
如图4和图5所示，隔膜2313的设置隔膜包覆部2341的非接触表面2313A处具有强化层23131。强化层23131通过从非接触表面2313A朝向隔膜2313的内侧分布隔膜包覆部2341的材料形成。强化层23131例如可以在通过气相沉积形成无机包覆层的过程中，气相沉积的原料气体向隔膜2313的内部渗透而形成。
如图4所示的电极组件23中，端部防护层234还包括正极包覆部2342和负极包覆部2343。正极包覆部2342覆盖正极片主体部2311的沿第一方向X的两个端面并与正极片主体部2311形成一体结构。负极包覆部2343覆盖负极片主体部2312的沿第一方向X的两个端面并与负极片主体部2312形成一体结构。
如图4所示的电极组件23中，隔膜包覆部2341与正极包覆部2342和负极包覆部2343均相接。
如图4所示的电极组件23中，端部防护层234覆盖正极片主体部2311的沿第一方向X的两个端面的全部表面和负极片主体部2312的沿第一方向X的两个端面的全部表面。
端部防护层234的厚度为1μm。
如图6所示的电极组件23与图4和图5所示的电极组件23的主要区别为：
图6所示的电极组件23中，至少部分相邻的隔膜2313的同一端的至少部分非接触表面2313A上覆盖的隔膜包覆部2341相接。端部防护层234包括正极包覆部2342。正极包覆部2342覆盖正极片主体部2311的沿第一方向X的两个端面并与正极片主体部2311形成一体结构。隔膜包覆部2341与正极包覆部2342相接。端部防护层234覆盖正极片主体部2311的沿第一方向X的两个端面的全部表面。而负极片主体部2321的沿第一方向X的两个端面被其两侧面的两个隔膜2313的端部遮挡而未包覆端部防护层。
图6所示实施例未说明的部分均可参考图4和图5所示实施例的相关内容。
如图7所示的电极组件23与图4和图5所示的电极组件23的主要区别为：图7所示的电极组件23中，至少部分相邻的隔膜2313的同一端的至少部分非接触表面2313A上覆盖的隔膜包覆部2341相接。
如图7所示，端部防护层234包括正极包覆部2342和负极包覆部2343。正极包覆部2342覆盖正极片主体部2311的沿第一方向X的两个端面并与正极片主体部2311形成一体结构。负极包覆部2343覆盖负极片主体部2312的沿第一方向X的两个端面并与负极片主体部2312形成一体结构。隔膜包覆部2341与正极包覆部2342和负极包覆部2342相接。端部防护层234覆盖正极片主体部2311的沿第一方向X的两个端面的全部表面。
需要说明的是，图4至图7分别示出了一电极组件23的部分层(每一正极片主体部、每一负极片主体部和每一隔膜均可称为一层)的一个剖面的剖视结构。在一些实施例中，可以是同一电极组件23的部分层为图4所示的结构，而另一部分层为图6和/或图7所示的结构。在另一些实施例中，可以是同一电极组件23的同一部分层的不同剖面分别具有图4至图7所示的结构等等。
最后应当说明的是：以上实施例仅用以说明本公开的技术方案而非对其限制；尽管参照较佳实施例对本公开进行了详细的说明，所属领域的普通技术人员应当理解：依然可以对本公开的具体实施方式进行修改或者对部分技术特征进行等同替换，其均应涵盖在本公开请求保护的技术方案范围当中。

Claims (14)

  1. 一种电极组件(23)，包括：
    电极组件主体(231)，所述电极组件主体(231)包括正极片主体部(2311)、负极片主体部(2312)和用于隔离所述正极片主体部(2311)和所述负极片主体部(2312)的隔膜(2313)，在所述电极组件主体(231)的沿第一方向(X)的两端，所述隔膜相对于所述正极片主体部(2311)和所述负极片主体部(2312)向外侧突出，所述隔膜(2313)的沿所述第一方向(X)的两端具有与所述正极片主体部(2311)和所述负极片主体部(2312)无接触的非接触表面(2313A)；和
    端部防护层(234)，所述端部防护层(234)设置于所述电极组件主体(231)的沿所述第一方向(X)的两端并与所述电极组件主体(231)形成一体结构，所述端部防护层(234)包括隔膜包覆部(2341)，所述隔膜包覆部(2341)覆盖至少部分所述非接触表面(2313A)并直接结合于所述非接触表面(2313A)以与所述隔膜(2313)形成一体结构。
  2. 根据权利要求1所述的电极组件(23)，其中所述端部防护层(234)包括无机包覆层或有机无机复合结构包覆层，所述无机包覆层或所述有机无机复合结构包覆层与所述电极组件主体(231)形成一体结构。
  3. 根据权利要求2所述的电极组件(23)，其中所述无机包覆层或所述有机无机复合结构包覆层通过气相沉积、喷涂或溅射形成为一体结构。
  4. 根据权利要求1至3中任一项所述的电极组件(23)，其中全部所述非接触表面(2313A)均设有所述隔膜包覆部(2341)。
  5. 根据权利要求1至4中任一项所述的电极组件(23)，其中所述隔膜(2313)的设置所述隔膜包覆部(2341)的所述非接触表面(2313A)处具有强化层(23131)，所述强化层(23131)通过从所述非接触表面(2313A)朝向所述隔膜(2313)的内侧分布所述隔膜包覆部(2341)的材料形成。
  6. 根据权利要求1至5中任一项所述的电极组件(23)，其中至少部分相邻的所述隔膜(2313)的同一端的至少部分所述非接触表面(2313A)上覆盖的所述隔膜包覆部(2341)相接。
  7. 根据权利要求1至6中任一项所述的电极组件(23)，其中所述端部防护层(234)还包括：
    正极包覆部(2342)，所述正极包覆部(2342)覆盖所述正极片主体部(2311)的沿所述第一方向(X)的两个端面的至少部分表面并与所述正极片主体部(2311)形成一体结构；和/或
    负极包覆部(2343)，所述负极包覆部(2343)覆盖所述负极片主体部(2312)的沿所述第一方向(X)的两个端面的至少部分表面并与所述负极片主体部(2312)形成一体结构。
  8. 根据权利要求7所述的电极组件(23)，其中所述隔膜包覆部(2341)与所述正 极包覆部(2342)和/或所述负极包覆部(2343)相接。
  9. 根据权利要求1至8中任一项所述的电极组件(23)，其中
    所述端部防护层(234)覆盖所述正极片主体部(2311)的沿所述第一方向(X)的两个端面的全部表面；和/或
    所述端部防护层(234)覆盖所述负极片主体部(2312)的沿所述第一方向(X)的两个端面的全部表面。
  10. 根据权利要求1至9中任一项所述的电极组件(23)，其中所述端部防护层(234)的厚度为0.01μm-100μm。
  11. 根据权利要求10所述的电极组件(23)，其中所述端部防护层(234)的厚度为0.05μm-5μm。
  12. 一种电池单体，包括权利要求1至11中任一项所述的电极组件(23)。
  13. 一种电池，包括权利要求12所述的电池单体。
  14. 一种用电设备，包括根据权利要求13所述的电池，所述电池用于为所述用电设备提供电力。
PCT/CN2023/083019 2022-05-13 2023-03-22 电极组件、电池单体、电池和用电设备 WO2023216727A1 (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202221145650.1U CN217507578U (zh) 2022-05-13 2022-05-13 电极组件、电池单体、电池和用电设备
CN202221145650.1 2022-05-13

Publications (1)

Publication Number Publication Date
WO2023216727A1 true WO2023216727A1 (zh) 2023-11-16

Family

ID=83354547

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2023/083019 WO2023216727A1 (zh) 2022-05-13 2023-03-22 电极组件、电池单体、电池和用电设备

Country Status (2)

Country Link
CN (1) CN217507578U (zh)
WO (1) WO2023216727A1 (zh)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN217507578U (zh) * 2022-05-13 2022-09-27 宁德时代新能源科技股份有限公司 电极组件、电池单体、电池和用电设备

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN207909993U (zh) * 2018-01-08 2018-09-25 深圳市格瑞普电池有限公司 叠片锂离子电池
CN208157545U (zh) * 2018-05-10 2018-11-27 宁德新能源科技有限公司 电芯以及电化学装置
JP2021096910A (ja) * 2019-12-13 2021-06-24 株式会社豊田自動織機 蓄電装置の製造方法及び蓄電装置
US20210210761A1 (en) * 2016-03-24 2021-07-08 Nec Energy Devices, Ltd. Lithium ion secondary battery, electrode and method for producing same
CN214754076U (zh) * 2021-03-31 2021-11-16 惠州市赛能电池有限公司 电芯结构以及锂离子电池
CN214898757U (zh) * 2021-01-29 2021-11-26 东莞市赛普克电子科技有限公司 一种高安全性的叠片式锂离子电池
JP2022069042A (ja) * 2020-10-23 2022-05-11 株式会社豊田自動織機 蓄電セル
CN217507578U (zh) * 2022-05-13 2022-09-27 宁德时代新能源科技股份有限公司 电极组件、电池单体、电池和用电设备

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210210761A1 (en) * 2016-03-24 2021-07-08 Nec Energy Devices, Ltd. Lithium ion secondary battery, electrode and method for producing same
CN207909993U (zh) * 2018-01-08 2018-09-25 深圳市格瑞普电池有限公司 叠片锂离子电池
CN208157545U (zh) * 2018-05-10 2018-11-27 宁德新能源科技有限公司 电芯以及电化学装置
JP2021096910A (ja) * 2019-12-13 2021-06-24 株式会社豊田自動織機 蓄電装置の製造方法及び蓄電装置
JP2022069042A (ja) * 2020-10-23 2022-05-11 株式会社豊田自動織機 蓄電セル
CN214898757U (zh) * 2021-01-29 2021-11-26 东莞市赛普克电子科技有限公司 一种高安全性的叠片式锂离子电池
CN214754076U (zh) * 2021-03-31 2021-11-16 惠州市赛能电池有限公司 电芯结构以及锂离子电池
CN217507578U (zh) * 2022-05-13 2022-09-27 宁德时代新能源科技股份有限公司 电极组件、电池单体、电池和用电设备

Also Published As

Publication number Publication date
CN217507578U (zh) 2022-09-27

Similar Documents

Publication Publication Date Title
WO2023174266A1 (zh) 壳体、电池单体、电池及用电设备
WO2024060403A1 (zh) 电池单体、电池、用电装置以及焊接设备
WO2022247292A1 (zh) 电池单体、电池以及用电装置
WO2023070677A1 (zh) 电池单体、电池、用电设备、制造电池单体的方法和设备
US20230089208A1 (en) Battery, power consumption apparatus, and method and apparatus for producing battery
WO2023216727A1 (zh) 电极组件、电池单体、电池和用电设备
CN218414808U (zh) 电池单体、电池以及用电装置
WO2023197905A1 (zh) 端盖组件、电池单体、电池和用电设备
WO2024045692A1 (zh) 电池模组、电池以及用电装置
WO2023173429A1 (zh) 电池单体及其制造方法和制造设备、电池、用电设备
WO2024036752A1 (zh) 电极组件、电池单体、电池及用电装置
WO2024016453A1 (zh) 电池单体、电池及用电装置
WO2023168954A1 (zh) 电芯、电芯的制造方法、电池单体、电池及用电设备
WO2023133748A1 (zh) 电池模块、电池、用电设备、制备电池的方法和设备
WO2023216223A1 (zh) 电芯、电池单体、电池和用电设备
WO2024026829A1 (zh) 电池单体、电池以及用电装置
WO2024055167A1 (zh) 电池单体、电池和用电设备
WO2024077557A1 (zh) 电池单体、电池及用电设备
WO2023050311A1 (zh) 电池及其制造方法和制造系统、用电装置
WO2023173428A1 (zh) 电池单体及其制造方法和制造设备、电池、用电设备
WO2024020766A1 (zh) 电池单体、电池、用电装置及电池单体的制造方法
CN220895734U (zh) 电池单体、电池、用电设备及储能装置
WO2023216254A1 (zh) 电极组件、电池单体、电池及用电设备
WO2023230746A1 (zh) 电池单体、电池及用电装置
WO2023220880A1 (zh) 端盖组件、电池单体、电池及用电装置

Legal Events

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

Ref document number: 23802503

Country of ref document: EP

Kind code of ref document: A1