CN113130838A - Preparation method of multi-tab battery cell pole piece, multi-tab battery cell pole piece and multi-tab battery cell - Google Patents
Preparation method of multi-tab battery cell pole piece, multi-tab battery cell pole piece and multi-tab battery cell Download PDFInfo
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- CN113130838A CN113130838A CN202110287457.5A CN202110287457A CN113130838A CN 113130838 A CN113130838 A CN 113130838A CN 202110287457 A CN202110287457 A CN 202110287457A CN 113130838 A CN113130838 A CN 113130838A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/043—Processes of manufacture in general involving compressing or compaction
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
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- 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
Abstract
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a preparation method of a multi-tab battery cell pole piece, which comprises the following operations: dividing a current collector into a material area, a safety area and an electrode area in sequence; coating active substance slurry on the surfaces of the material area and the lug area to obtain an active substance layer, and coating safety slurry on the surface of the safety area to obtain a safety coating; removing part of active material layer in the tab region to obtain a plurality of tab empty foil regions; and rolling the current collector, and die-cutting a plurality of tabs along the safety area and the tab empty foil area to obtain the multi-tab battery cell pole piece. On one hand, the surfaces of the material area, the safety area and the lug area are coated with the sizing agent, so that the current collectors in the material area, the safety area and the lug area can have similar ductility during rolling, and the pole pieces are prevented from being wavy and wrinkled; on the other hand, a plurality of tabs are die-cut along the safety coating after rolling, so that burrs can be prevented from being generated at the die-cutting edge, and further the burrs are prevented from puncturing the diaphragm to influence the safety performance of the battery core.
Description
Technical Field
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a preparation method of a multi-tab battery cell pole piece, the multi-tab battery cell pole piece and a multi-tab battery cell.
Background
Lithium ion batteries have the advantages of light weight, good safety performance and the like, so that the lithium ion batteries are applied to the fields of mobile electronic equipment such as Bluetooth headsets, mobile phones, notebook computers, tablet computers and cameras, portable mobile power supplies and the like. Meanwhile, lithium ion batteries have also been applied in the fields of electric motorcycles, electric automobiles, and the like in batches.
The development of the multi-tab technology greatly improves the energy density of the lithium ion battery and plays a role in promoting the development of the lithium battery industry in China. At present, when a pole piece is coated, a current collector edge empty foil area can be reserved at the edge of a long edge of a full material area to serve as a foil electrode lug, and the foil electrode lug is formed through die cutting. After the winding process, the multilayer foil tabs and the metal strip tabs are welded, and the finished product battery core is manufactured after various processes.
However, the current multi-tab structure battery cell has a major limitation in the manufacturing process, mainly because the thickness of the positive current collector is thin, rolling is required after the current collector is coated with active material slurry, and the compaction density of the positive electrode plate is generally required to be 4.0-4.2 g/cm3However, since the edge empty foil area of the current collector is made of metal foil, the current collector in the material area and the current collector in the edge empty foil area are prone to wave wrinkling due to uneven spreading during rollingThe pole piece wrinkling can cause unevenness of the surface of the naked battery cell, and the stress concentration part can cause damage of the diaphragm, so that micro short circuit and even short circuit of the battery cell are caused. The resistance of the battery can be increased by wrinkling the lug, so that the battery can generate heat quickly in the charging and discharging process, and the cycle life is shortened. In addition, the crimping of the tabs may also cause the membrane to puncture, causing a short circuit.
In view of the above, it is necessary to provide a technical solution to the above technical problems.
Disclosure of Invention
One of the objects of the present invention is: aiming at the defects of the prior art, the preparation method of the multi-tab battery cell pole piece is provided, and the wave wrinkling caused by the fact that the pole piece is not uniformly extended after being rolled can be avoided.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of a multi-tab battery cell pole piece comprises the following operations:
dividing a current collector into a material area, a safety area and an electrode area in sequence;
coating active material slurry on the surfaces of the material area and the lug area to obtain an active material layer, and coating safety slurry on the surface of the safety area to obtain a safety coating;
removing part of the active material layer in the tab region to obtain a plurality of tab empty foil regions;
and rolling the current collector, and die-cutting a plurality of tabs along the safety area and the tab empty foil area to obtain the multi-tab battery cell pole piece.
As an improvement of the preparation method of the multi-tab battery cell pole piece, the root of the tab is also reserved with the safety coating.
As an improvement of the preparation method of the multi-tab battery cell pole piece, the solid content of the active substance slurry is 50-60%, and the solid content of the safety slurry is 50-60%.
As an improvement of the preparation method of the multi-tab battery cell pole piece, the active material slurry and the safety slurry are coated simultaneously, and the active material layer and the safety coating are arranged adjacently.
As an improvement of the preparation method of the multi-tab battery cell pole piece, the active substance slurry and the safety slurry are coated intermittently.
As an improvement of the preparation method of the multi-tab battery cell pole piece, the safety paste comprises ceramic particles, and the ceramic particles comprise at least one of alumina, silica and boehmite.
As an improvement of the preparation method of the multi-tab battery cell pole piece, the active substance layer in the tab area is removed by a laser cleaning and/or solvent wiping method.
The second objective of the present invention is to provide a multi-tab battery cell pole piece, which is prepared by the method described in any one of the above descriptions.
The invention also provides a multi-tab battery cell, which comprises a positive plate, a negative plate and a diaphragm arranged between the positive plate and the negative plate, wherein the positive plate and/or the negative plate is/are the multi-tab battery cell pole piece described in the specification.
The fourth objective of the present invention is to provide a method for manufacturing a multi-tab battery cell, which comprises the following operations:
the positive plate is prepared by any one of the preparation methods of the multi-tab battery cell pole piece in the specification;
dividing a negative current collector into a negative material area and a negative electrode lug area;
coating negative electrode active material slurry on the surface of the negative electrode material area to obtain a negative electrode active material layer;
rolling the negative current collector, and die-cutting a plurality of negative lugs along the negative active material layer and the negative lug area to obtain a negative plate;
and winding and/or laminating the positive plate, the diaphragm and the negative plate to obtain the multi-tab battery cell.
Compared with the prior art, the beneficial effects of the invention include but are not limited to: according to the invention, the surfaces of the material area and the lug area are coated with active substance slurry, the safety area is arranged between the material area and the lug area, and the surface of the safety area is coated with the safety coating, so that on one hand, the surfaces of the material area, the safety area and the lug area are coated with the slurry, and the current collectors in the material area, the safety area and the lug area can have similar ductility during rolling, so that the pole piece is prevented from being wavy and wrinkled; on the other hand, a plurality of tabs are die-cut along the safety coating after rolling, so that burrs can be prevented from being generated at the die-cutting edge, and further the burrs are prevented from puncturing the diaphragm to influence the safety performance of the battery core.
Drawings
Fig. 1 is a schematic structural diagram obtained in step S2 in example 1.
Fig. 2 is a schematic structural diagram obtained in step S3 in example 1.
Fig. 3 is a schematic structural diagram obtained in step S4 in example 1.
Fig. 4 is a schematic view of the structure obtained in step S3 in example 3.
Fig. 5 is a schematic view of the structure obtained in step S4 in example 3.
In the figure: 1-positive pole current collector, 2-positive pole active material layer, 3-safety coating, 11-positive pole lug, 4-negative pole current collector, 5-negative pole active material layer and 41-negative pole lug.
Detailed Description
The present application is further illustrated with reference to specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present application.
1. The invention provides a preparation method of a multi-tab battery cell pole piece, which comprises the following operations:
dividing a current collector into a material area, a safety area and an electrode area in sequence;
coating active substance slurry on the surfaces of the material area and the lug area to obtain an active substance layer, and coating safety slurry on the surface of the safety area to obtain a safety coating;
removing part of active material layer in the tab region to obtain a plurality of tab empty foil regions;
and rolling the current collector, and die-cutting a plurality of tabs along the safety area and the tab empty foil area to obtain the multi-tab battery cell pole piece.
According to the invention, the surfaces of the material area and the lug area are coated with active substance slurry, the safety area is arranged between the material area and the lug area, and the surface of the safety area is coated with the safety coating, so that on one hand, the surfaces of the material area, the safety area and the lug area are coated with the slurry, and the current collectors in the material area, the safety area and the lug area can have similar ductility during rolling, so that the pole piece is prevented from being wavy and wrinkled; on the other hand, a plurality of tabs are die-cut along the safety coating after rolling, so that burrs can be prevented from being generated at the die-cutting edge, and further the burrs are prevented from puncturing the diaphragm to influence the safety performance of the battery core.
In some embodiments, the root portion of the tab also retains a safety coating. When a plurality of tabs are die-cut after rolling, the root of each tab is kept with a part of safe coating, and burrs caused by die-cutting of the pole pieces can be prevented.
In some embodiments, the active material slurry has a solid content of 50-60% and the safety slurry has a solid content of 50-60%. The solid contents of the active substance slurry and the safety slurry are similar, so that the current collectors in the material area and the safety area can have the same ductility during rolling, and the current collectors are prevented from being wavy or wrinkled during rolling.
In some embodiments, the active material slurry and the security slurry are applied simultaneously, with the active material layer and the security coating layer being disposed adjacent. Active material thick liquids and safe thick liquids coat simultaneously for active material layer and safe coating adjoin the setting, can practice thrift the coating time, can also guarantee during subsequent roll-in that the material district is the same with the ductility with the stress of the mass flow body in safe district, avoid the phenomenon that the wave corrugates when the roll-in appears.
In some embodiments, the active material slurry and the safety slurry are intermittently applied with the active material layer and the safety coating layer partially overlapping. The active material slurry and the safety slurry can also be coated with the active material slurry firstly and then coated with the safety slurry, and thus, the requirement on the coating precision of coating equipment is relatively low.
In some embodiments, the security slurry includes ceramic particles including at least one of alumina, silica, and boehmite. The ceramic particles in the safety slurry can play an insulating role, and burrs can be avoided from being generated on the pole pieces when the rear process is die-cut along the safety coating on the surface of the safety area, so that the situation that the burrs generated by die-cutting puncture the diaphragm to cause short circuit inside the battery cell can be prevented, and the safety performance of the battery cell is improved. The safety paste includes a solvent for dispersing the ceramic particles, the solvent including N-methylpyrrolidone, absolute ethyl alcohol, methyl ethyl ketone, EP (epoxy resin), DEC (diethyl carbonate), PC (propylene carbonate), EMC (methyl ethyl carbonate), DMC (dimethyl carbonate), PP (polypropylene), and the like, ceramic particles, and a binder. The binder is used for binding the ceramic particles, and comprises polyvinyl alcohol, hydroxypropyl cellulose, diacetyl cellulose, polyvinyl chloride, carboxylated polyvinyl chloride, polyvinyl fluoride, ethylene oxide-containing polymer, polyvinylpyrrolidone, polyurethane, polytetrafluoroethylene, polyvinylidene 1, 1-difluoroethylene, polyethylene, polypropylene, styrene-butadiene rubber, acrylated styrene-butadiene rubber, epoxy resin, nylon and the like.
In some embodiments, portions of the active material layer in the polar ear region are removed by laser cleaning and/or solvent wiping. Through the continuous tape transport location of pole piece laser cleaning equipment accessible pole piece, the convulsions are removed dust and are clean, use laser to burn off partial active material layer fast, gasify, expose the middle metal current collector that conducts of centre. The solvent comprises N-methyl pyrrolidone, absolute ethyl alcohol, butanone, EP (epoxy resin), DEC (diethyl carbonate), PC (propylene carbonate), EMC (methyl ethyl carbonate), DMC (dimethyl carbonate), PP (polypropylene) and the like, and the surface of the empty foil area of the tab can be prevented from being left with an active substance layer by wiping with the solvent, so that the tab of the foil is subjected to cold welding, and the safety performance of the battery cell is improved.
2. A second aspect of the invention provides a multi-tab cell pole piece prepared by the method of any one of the preceding paragraphs of the specification.
3. A third aspect of the present invention provides a multi-tab battery cell, including a positive plate, a negative plate, and a diaphragm disposed between the positive plate and the negative plate, where the positive plate and/or the negative plate is the multi-tab battery cell plate in the foregoing description.
In the multi-tab battery cell, the positive plate comprises a positive current collector and a positive active material layer, the material of the positive current collector comprises but is not limited to aluminum foil, and the specific type of the positive active material layer is not particularly limited and can be selected according to requirements.
In some embodiments, the positive electrode active material layer includes a positive electrode active material including a compound that reversibly intercalates and deintercalates lithium ions. In some embodiments, the positive active material may include a composite oxide containing lithium and at least one element selected from cobalt, manganese, and nickel. In still other embodiments, the positive active material is selected from lithium cobaltate (LiCoO)2) Lithium nickel manganese cobalt ternary material and lithium manganate (LiMn)2O4) Lithium nickel manganese oxide (LiNi)0.5Mn1.5O4) Lithium iron phosphate (LiFePO)4) One or more of them.
In some embodiments, the positive electrode active material layer further comprises a positive electrode binder for improving the binding of the positive electrode active material particles to each other and also to the main body of the electrode sheet. Non-limiting examples of the positive electrode binder include polyvinyl alcohol, hydroxypropyl cellulose, diacetyl cellulose, polyvinyl chloride, carboxylated polyvinyl chloride, polyvinyl fluoride, ethylene oxide-containing polymer, polyvinyl pyrrolidone, polyurethane, polytetrafluoroethylene, polyvinylidene 1, 1-difluoroethylene, polyethylene, polypropylene, styrene-butadiene rubber, acrylated styrene-butadiene rubber, epoxy resin, nylon, and the like.
In some embodiments, the positive electrode active material layer further includes a positive electrode conductive agent, thereby imparting conductivity to the electrode. The positive electrode conductive agent may include any conductive material as long as it does not cause a chemical change. Non-limiting examples of the conductive material include carbon-based materials (e.g., natural graphite, artificial graphite, carbon black, acetylene black, ketjen black, carbon fiber, etc.), metal-based materials (e.g., metal powder, metal fiber, etc., including, for example, copper, nickel, aluminum, silver, etc.), conductive polymers (e.g., polyphenylene derivatives), and mixtures thereof.
In the multi-tab battery cell, the negative plate includes a negative current collector and a negative active material layer disposed on at least one surface of the negative current collector, the material of the negative current collector includes, but is not limited to, copper foil, and the specific type of the negative active material layer is not particularly limited and can be selected according to the requirement.
In some embodiments, the negative active material layer includes a negative active material including artificial graphite, natural graphite, single-walled carbon nanotubes, multi-walled carbon nanotubes, mesophase micro carbon spheres (abbreviated as MCMB), hard carbon, soft carbon, silicon-carbon composites, Li-Sn alloys, Li-Sn-O alloys, Sn, SnO2Spinel-structured lithiated TiO2-Li4Ti5O12And one or more of Li-Al alloy.
In some embodiments, the anode active material layer may include an anode binder for improving the binding of the anode active material particles to each other and the binding of the anode active material to the current collector. Non-limiting examples of binders include polyvinyl alcohol, carboxymethyl cellulose, hydroxypropyl cellulose, diacetyl cellulose, polyvinyl chloride, carboxylated polyvinyl chloride, polyvinyl fluoride, ethylene oxide containing polymers, polyvinyl pyrrolidone, polyurethane, polytetrafluoroethylene, polyvinylidene 1, 1-difluoroethylene, polyethylene, polypropylene, styrene-butadiene rubber, acrylated styrene-butadiene rubber, epoxy, nylon, and the like.
In some embodiments, the negative electrode active material layer further includes a negative electrode conductive agent for imparting conductivity to the electrode. The negative electrode conductive agent may include any conductive material as long as it does not cause a chemical change. Non-limiting examples of the negative electrode conductive agent include carbon-based materials (e.g., natural graphite, artificial graphite, carbon black, acetylene black, ketjen black, carbon fiber, etc.), metal-based materials (e.g., metal powder, metal fiber, etc., such as copper, nickel, aluminum, silver, etc.), conductive polymers (e.g., polyphenylene derivatives), and mixtures thereof.
In the multi-tab battery cell, a diaphragm is arranged between the positive plate and the negative plate to prevent short circuit. The material and shape of the separator are not particularly limited, and may be any of the techniques disclosed in the prior art.
In some embodiments, the separator may include a substrate layer and a surface treatment layer. The substrate layer is a non-woven fabric, a film or a composite film with a porous structure, and the material of the substrate layer is at least one selected from polyethylene, polypropylene, polyethylene terephthalate and polyimide. Specifically, a polypropylene porous film, a polyethylene porous film, a polypropylene nonwoven fabric, a polyethylene nonwoven fabric, or a polypropylene-polyethylene-polypropylene porous composite film can be used. At least one surface of the substrate layer is provided with a surface treatment layer, and the surface treatment layer can be a polymer layer or an inorganic layer, or a layer formed by mixing a polymer and an inorganic substance. The inorganic layer comprises inorganic particles and a binder, wherein the inorganic particles are selected from one or more of aluminum oxide, silicon oxide, magnesium oxide, titanium oxide, hafnium oxide, tin oxide, cerium dioxide, nickel oxide, zinc oxide, calcium oxide, zirconium oxide, yttrium oxide, silicon carbide, boehmite, aluminum hydroxide, magnesium hydroxide, calcium hydroxide and barium sulfate. The binder is selected from one or a combination of more of polyvinylidene fluoride, vinylidene fluoride-hexafluoropropylene copolymer, polyamide, polyacrylonitrile, polyacrylate, polyacrylic acid, polyacrylate, polyvinylpyrrolidone, polyvinyl ether, polymethyl methacrylate, polytetrafluoroethylene and polyhexafluoropropylene. The polymer layer comprises a polymer, and the material of the polymer is selected from at least one of polyamide, polyacrylonitrile, acrylate polymer, polyacrylic acid, polyacrylate, polyvinylpyrrolidone, polyvinyl ether, polyvinylidene fluoride and poly (vinylidene fluoride-hexafluoropropylene).
4. The fourth aspect of the present invention provides a method for preparing a multi-tab battery cell, which includes the following operations:
preparing a positive plate by any one of the preparation methods of the multi-tab battery cell pole pieces in the specification;
dividing a negative current collector into a negative material area and a negative electrode lug area;
coating the surface of the negative electrode material area with negative electrode active material slurry to obtain a negative electrode active material layer;
rolling the negative current collector, and die-cutting a plurality of negative lugs along the negative active material layer and the negative lug area to obtain a negative plate;
and winding and/or laminating the positive plate, the diaphragm and the negative plate to obtain the multi-tab battery cell.
Examples
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited thereto.
Example 1
As shown in fig. 1 to 3, the present embodiment provides a method for preparing a multi-tab battery cell positive plate, including the following operations:
s1, sequentially dividing the aluminum foil of the positive current collector 1 into a material area, a safety area with the width of 4mm and a tab area with the width of 15mm, and designing the size of a tab to be 6mm x 16 mm;
s2, mixing lithium cobaltate, a conductive agent SuperP and a binder polyvinylidene fluoride according to the weight ratio of 96.4:2.0:1.6, adding N-methylpyrrolidone (NMP), and stirring under the action of a vacuum stirrer until the system is uniform to obtain positive active material slurry with the solid content of 55%;
mixing ceramic particle boehmite and a binding agent polyvinylidene fluoride according to a weight ratio of 95:5, adding N-methyl pyrrolidone (NMP), and stirring under the action of a vacuum stirrer until the system is uniform to obtain safe slurry with the solid content of 55%;
coating a positive electrode current collector 1 on zebra, coating positive electrode active substance slurry on the surfaces of a material area and a tab area to obtain a positive electrode active substance layer 2, and then coating safety slurry on the surface of a safety area to obtain a safety coating 3, so that the active substance layer and the safety coating 3 are arranged adjacently;
s3, removing part of the positive electrode active material layer 2 on the edge of the tab area by laser cleaning, designing the cleaning size to be 8mm x 15mm to obtain a plurality of positive electrode tab empty foil areas, and wiping the positive electrode tab empty foil areas by absolute ethyl alcohol;
and S4, rolling the positive current collector 1, and die-cutting a plurality of positive lugs 11 with the size of 6mm x 16mm along the safety area and the positive lug empty foil area to obtain the multi-lug cell positive plate.
Compared with the prior art, the active material slurry is coated on the surfaces of the material area and the lug area, the safety area is arranged between the material area and the lug area, and the safety coating 3 is coated on the surface of the safety area, so that on one hand, the slurry is coated on the surfaces of the material area, the safety area and the lug area, the current collectors in the material area, the safety area and the lug area can have similar ductility during rolling, and the pole piece is prevented from being wavy and wrinkled; on the other hand, a plurality of tabs are die-cut along the safety coating 3 after rolling, so that burrs can be prevented from being generated at the die-cutting edge, and further the burrs are prevented from puncturing the diaphragm to influence the safety performance of the battery core.
Example 2
The embodiment provides a method for preparing a multi-tab battery cell positive plate, which is different from the embodiment 1 in that in step S2, active material slurry is coated first, and then safety slurry is coated, so that the requirement on the coating precision of coating equipment is relatively low. The rest is the same as embodiment 1, and the description is omitted here.
Example 3
As shown in fig. 4 to 5, this embodiment provides a multi-tab battery cell, including a positive plate, a negative plate, and a diaphragm disposed between the positive plate and the negative plate, where the positive plate is the multi-tab battery cell pole piece in embodiment 1.
The preparation method of the multi-tab battery cell comprises the following operations:
s1, preparing a positive plate by the method for preparing a multi-tab battery cell pole piece in embodiment 1;
s2, dividing the negative current collector 4 into a negative material area and a negative electrode lug area with the width of 16 mm;
s3, mixing the artificial graphite serving as the negative electrode active material, a conductive agent SuperP, a thickening agent carboxymethylcellulose sodium (CMC) and a binder Styrene Butadiene Rubber (SBR) according to a weight ratio of 96.4:1.5:0.5:1.6, adding deionized water, and obtaining negative electrode active material slurry with the solid content of 54% under the action of a vacuum stirrer; coating the surface of the negative electrode material area with negative electrode active material slurry to obtain a negative electrode active material layer 5;
s4, die cutting a plurality of negative electrode tabs 41 with the size of 6mm 16mm along the negative electrode active material layer 5 area and the negative electrode tab area which are cut into the negative electrode material area by 2mm after rolling to obtain a negative electrode sheet;
and S5, winding and/or laminating the positive plate, the diaphragm and the negative plate to obtain the multi-tab battery cell.
Variations and modifications to the above-described embodiments may also occur to those skilled in the art, which fall within the scope of the invention as disclosed and taught herein. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious improvement, replacement or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
1. A preparation method of a multi-tab battery cell pole piece is characterized by comprising the following operations:
dividing a current collector into a material area, a safety area and an electrode area in sequence;
coating active material slurry on the surfaces of the material area and the lug area to obtain an active material layer, and coating safety slurry on the surface of the safety area to obtain a safety coating;
removing part of the active material layer in the tab region to obtain a plurality of tab empty foil regions;
and rolling the current collector, and die-cutting a plurality of tabs along the safety area and the tab empty foil area to obtain the multi-tab battery cell pole piece.
2. The method of claim 1, wherein the safety coating is retained at the root of the tab.
3. The preparation method of the multi-tab battery cell pole piece according to claim 1, wherein the solid content of the active material slurry is 50-60%, and the solid content of the safety slurry is 50-60%.
4. The method of claim 1, wherein the active material layer and the safety coating are applied simultaneously, and the active material layer and the safety coating are disposed adjacent to each other.
5. The method of claim 1, wherein the active material slurry and the safety slurry are applied intermittently.
6. The method of making a multi-tab cell pole piece of claim 1, wherein the safety paste comprises ceramic particles comprising at least one of alumina, silica, and boehmite.
7. The method of claim 1, wherein the active material layer is partially removed from the tab region by laser cleaning and/or solvent wiping.
8. A multi-tab cell pole piece, characterized in that it is prepared by the method of any one of claims 1 to 7.
9. A multi-tab cell comprising a positive plate, a negative plate and a diaphragm disposed between the positive plate and the negative plate, wherein the positive plate and/or the negative plate is the multi-tab cell plate of claim 8.
10. The method for preparing the multi-tab battery cell of claim 9, comprising the following operations:
preparing a positive plate by the preparation method of the multi-tab battery cell pole piece according to any one of claims 1 to 7;
dividing a negative current collector into a negative material area and a negative electrode lug area;
coating negative electrode active material slurry on the surface of the negative electrode material area to obtain a negative electrode active material layer;
rolling the negative current collector, and die-cutting a plurality of negative lugs along the negative active material layer and the negative lug area to obtain a negative plate;
and winding and/or laminating the positive plate, the diaphragm and the negative plate to obtain the multi-tab battery cell.
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| CN202110287457.5A CN113130838B (en) | 2021-03-17 | 2021-03-17 | Preparation method of multi-tab cell pole piece, multi-tab cell pole piece and multi-tab cell |
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| CN202110287457.5A CN113130838B (en) | 2021-03-17 | 2021-03-17 | Preparation method of multi-tab cell pole piece, multi-tab cell pole piece and multi-tab cell |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113782700A (en) * | 2021-09-15 | 2021-12-10 | 珠海冠宇电池股份有限公司 | Positive plate and lithium ion battery |
| CN113851604A (en) * | 2021-09-28 | 2021-12-28 | 惠州锂威新能源科技有限公司 | Preparation method of multi-tab battery cell, multi-tab battery cell and multi-tab battery |
| CN113948671A (en) * | 2021-09-02 | 2022-01-18 | 惠州锂威新能源科技有限公司 | Preparation method of positive pole piece, positive pole piece and secondary battery |
| CN114300651A (en) * | 2021-12-31 | 2022-04-08 | 珠海冠宇电池股份有限公司 | Pole piece and battery |
| CN114975885A (en) * | 2022-06-13 | 2022-08-30 | 惠州锂威新能源科技有限公司 | Preparation method of tab pole piece, battery cell and lithium ion battery |
| CN115000345A (en) * | 2022-06-27 | 2022-09-02 | 楚能新能源股份有限公司 | Battery pole piece, production method thereof, battery core package containing pole piece and battery |
| CN115050928A (en) * | 2022-07-01 | 2022-09-13 | 惠州锂威新能源科技有限公司 | Pole piece preparation method, pole piece and battery cell |
| CN116014083A (en) * | 2023-02-16 | 2023-04-25 | 江苏正力新能电池技术有限公司 | Manufacturing process of lithium ion battery capable of preventing tab from being reversely inserted and lithium ion battery |
Citations (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6152971A (en) * | 1996-11-06 | 2000-11-28 | Dai Nippon Printing Co., Ltd. | Electrode plate for secondary battery with nonaqueous electrolyte and process for producing same |
| CN105655540A (en) * | 2014-11-12 | 2016-06-08 | 宁德时代新能源科技股份有限公司 | Electrode pole piece and lithium ion battery |
| CN106129327A (en) * | 2016-08-10 | 2016-11-16 | 欣旺达电子股份有限公司 | Anode slice of lithium ion battery and lithium ion battery |
| CN106450149A (en) * | 2016-08-31 | 2017-02-22 | 合肥国轩高科动力能源有限公司 | Pole piece processing technology |
| CN206250283U (en) * | 2016-12-02 | 2017-06-13 | 东莞新能源科技有限公司 | A kind of cathode sheet and battery core |
| CN107768676A (en) * | 2017-09-05 | 2018-03-06 | 东莞市迈科新能源有限公司 | A kind of lithium ion battery and its pole piece |
| CN109148888A (en) * | 2018-08-30 | 2019-01-04 | 成都市银隆新能源产业技术研究有限公司 | Lithium battery electrode plate and preparation method thereof |
| CN110911637A (en) * | 2019-12-05 | 2020-03-24 | 东莞塔菲尔新能源科技有限公司 | Negative plate, preparation method thereof and lithium ion battery |
| JP2020047506A (en) * | 2018-09-20 | 2020-03-26 | トヨタ自動車株式会社 | Method for manufacturing electrode |
| CN111326699A (en) * | 2019-08-14 | 2020-06-23 | 宁德时代新能源科技股份有限公司 | Secondary battery |
| CN111540908A (en) * | 2020-05-19 | 2020-08-14 | 江苏塔菲尔新能源科技股份有限公司 | Pole piece structure and lithium ion battery |
| CN111640948A (en) * | 2020-05-26 | 2020-09-08 | 江苏塔菲尔新能源科技股份有限公司 | Anode pole piece, preparation method thereof and lithium ion battery |
| CN111668444A (en) * | 2020-05-22 | 2020-09-15 | 惠州锂威新能源科技有限公司 | Preparation method of multi-tab battery cell and multi-tab battery cell |
| CN111668451A (en) * | 2020-05-22 | 2020-09-15 | 惠州锂威新能源科技有限公司 | Preparation method of pole piece for winding type multi-tab battery cell, pole piece and battery cell |
| CN211605277U (en) * | 2020-01-06 | 2020-09-29 | 万向一二三股份公司 | Ceramic coating pole piece for preventing pole lug from being broken |
| CN111916645A (en) * | 2020-07-01 | 2020-11-10 | 江苏塔菲尔新能源科技股份有限公司 | Pole piece, preparation method of pole piece and battery |
| CN112234212A (en) * | 2020-10-14 | 2021-01-15 | 珠海冠宇动力电池有限公司 | Positive pole piece and lithium ion battery comprising same |
| WO2021027490A1 (en) * | 2019-08-14 | 2021-02-18 | 宁德时代新能源科技股份有限公司 | Electrode assembly and battery unit |
-
2021
- 2021-03-17 CN CN202110287457.5A patent/CN113130838B/en active Active
Patent Citations (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6152971A (en) * | 1996-11-06 | 2000-11-28 | Dai Nippon Printing Co., Ltd. | Electrode plate for secondary battery with nonaqueous electrolyte and process for producing same |
| CN105655540A (en) * | 2014-11-12 | 2016-06-08 | 宁德时代新能源科技股份有限公司 | Electrode pole piece and lithium ion battery |
| CN106129327A (en) * | 2016-08-10 | 2016-11-16 | 欣旺达电子股份有限公司 | Anode slice of lithium ion battery and lithium ion battery |
| CN106450149A (en) * | 2016-08-31 | 2017-02-22 | 合肥国轩高科动力能源有限公司 | Pole piece processing technology |
| CN206250283U (en) * | 2016-12-02 | 2017-06-13 | 东莞新能源科技有限公司 | A kind of cathode sheet and battery core |
| CN107768676A (en) * | 2017-09-05 | 2018-03-06 | 东莞市迈科新能源有限公司 | A kind of lithium ion battery and its pole piece |
| CN109148888A (en) * | 2018-08-30 | 2019-01-04 | 成都市银隆新能源产业技术研究有限公司 | Lithium battery electrode plate and preparation method thereof |
| JP2020047506A (en) * | 2018-09-20 | 2020-03-26 | トヨタ自動車株式会社 | Method for manufacturing electrode |
| CN111326699A (en) * | 2019-08-14 | 2020-06-23 | 宁德时代新能源科技股份有限公司 | Secondary battery |
| WO2021027490A1 (en) * | 2019-08-14 | 2021-02-18 | 宁德时代新能源科技股份有限公司 | Electrode assembly and battery unit |
| CN110911637A (en) * | 2019-12-05 | 2020-03-24 | 东莞塔菲尔新能源科技有限公司 | Negative plate, preparation method thereof and lithium ion battery |
| CN211605277U (en) * | 2020-01-06 | 2020-09-29 | 万向一二三股份公司 | Ceramic coating pole piece for preventing pole lug from being broken |
| CN111540908A (en) * | 2020-05-19 | 2020-08-14 | 江苏塔菲尔新能源科技股份有限公司 | Pole piece structure and lithium ion battery |
| CN111668444A (en) * | 2020-05-22 | 2020-09-15 | 惠州锂威新能源科技有限公司 | Preparation method of multi-tab battery cell and multi-tab battery cell |
| CN111668451A (en) * | 2020-05-22 | 2020-09-15 | 惠州锂威新能源科技有限公司 | Preparation method of pole piece for winding type multi-tab battery cell, pole piece and battery cell |
| CN111640948A (en) * | 2020-05-26 | 2020-09-08 | 江苏塔菲尔新能源科技股份有限公司 | Anode pole piece, preparation method thereof and lithium ion battery |
| CN111916645A (en) * | 2020-07-01 | 2020-11-10 | 江苏塔菲尔新能源科技股份有限公司 | Pole piece, preparation method of pole piece and battery |
| CN112234212A (en) * | 2020-10-14 | 2021-01-15 | 珠海冠宇动力电池有限公司 | Positive pole piece and lithium ion battery comprising same |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113948671A (en) * | 2021-09-02 | 2022-01-18 | 惠州锂威新能源科技有限公司 | Preparation method of positive pole piece, positive pole piece and secondary battery |
| CN113782700A (en) * | 2021-09-15 | 2021-12-10 | 珠海冠宇电池股份有限公司 | Positive plate and lithium ion battery |
| CN113782700B (en) * | 2021-09-15 | 2024-05-07 | 珠海冠宇电池股份有限公司 | Positive plate and lithium ion battery |
| CN113851604A (en) * | 2021-09-28 | 2021-12-28 | 惠州锂威新能源科技有限公司 | Preparation method of multi-tab battery cell, multi-tab battery cell and multi-tab battery |
| CN114300651A (en) * | 2021-12-31 | 2022-04-08 | 珠海冠宇电池股份有限公司 | Pole piece and battery |
| CN114975885A (en) * | 2022-06-13 | 2022-08-30 | 惠州锂威新能源科技有限公司 | Preparation method of tab pole piece, battery cell and lithium ion battery |
| CN114975885B (en) * | 2022-06-13 | 2023-06-27 | 惠州锂威新能源科技有限公司 | Preparation method of tab pole piece, battery cell and lithium ion battery |
| CN115000345A (en) * | 2022-06-27 | 2022-09-02 | 楚能新能源股份有限公司 | Battery pole piece, production method thereof, battery core package containing pole piece and battery |
| CN115000345B (en) * | 2022-06-27 | 2023-03-17 | 楚能新能源股份有限公司 | Battery pole piece and production method thereof, battery core package containing pole piece and battery |
| CN115050928A (en) * | 2022-07-01 | 2022-09-13 | 惠州锂威新能源科技有限公司 | Pole piece preparation method, pole piece and battery cell |
| CN116014083A (en) * | 2023-02-16 | 2023-04-25 | 江苏正力新能电池技术有限公司 | Manufacturing process of lithium ion battery capable of preventing tab from being reversely inserted and lithium ion battery |
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