WO2023000629A1 - 一种无极耳锂离子电池及其制作方法 - Google Patents
一种无极耳锂离子电池及其制作方法 Download PDFInfo
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- WO2023000629A1 WO2023000629A1 PCT/CN2022/071625 CN2022071625W WO2023000629A1 WO 2023000629 A1 WO2023000629 A1 WO 2023000629A1 CN 2022071625 W CN2022071625 W CN 2022071625W WO 2023000629 A1 WO2023000629 A1 WO 2023000629A1
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- Prior art keywords
- conductive
- positive
- negative electrode
- negative
- positive electrode
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 28
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 239000011248 coating agent Substances 0.000 claims abstract description 47
- 238000000576 coating method Methods 0.000 claims abstract description 47
- 239000012790 adhesive layer Substances 0.000 claims abstract description 38
- 238000007789 sealing Methods 0.000 claims abstract description 9
- 239000003792 electrolyte Substances 0.000 claims abstract description 7
- 239000011247 coating layer Substances 0.000 claims description 47
- 239000000463 material Substances 0.000 claims description 22
- 239000010410 layer Substances 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 12
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 9
- 239000007773 negative electrode material Substances 0.000 claims description 9
- 239000007774 positive electrode material Substances 0.000 claims description 9
- 229920005989 resin Polymers 0.000 claims description 9
- 239000011347 resin Substances 0.000 claims description 9
- 229910052709 silver Inorganic materials 0.000 claims description 9
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 239000004332 silver Substances 0.000 claims description 6
- 229910010293 ceramic material Inorganic materials 0.000 claims description 5
- 238000004804 winding Methods 0.000 claims description 4
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 3
- 239000004925 Acrylic resin Substances 0.000 claims description 3
- 229920000178 Acrylic resin Polymers 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 229910001593 boehmite Inorganic materials 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 239000002041 carbon nanotube Substances 0.000 claims description 3
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 229910052737 gold Inorganic materials 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 claims description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 3
- 229920001568 phenolic resin Polymers 0.000 claims description 3
- 239000005011 phenolic resin Substances 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 229920001721 polyimide Polymers 0.000 claims description 3
- 239000009719 polyimide resin Substances 0.000 claims description 3
- 229920000123 polythiophene Polymers 0.000 claims description 3
- 229920005749 polyurethane resin Polymers 0.000 claims description 3
- 229920002050 silicone resin Polymers 0.000 claims description 3
- 229910052725 zinc Inorganic materials 0.000 claims description 3
- 239000011888 foil Substances 0.000 description 14
- 238000003466 welding Methods 0.000 description 8
- 239000002002 slurry Substances 0.000 description 6
- 238000009413 insulation Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000011267 electrode slurry Substances 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical group [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910021383 artificial graphite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- YWXYYJSYQOXTPL-SLPGGIOYSA-N isosorbide mononitrate Chemical compound [O-][N+](=O)O[C@@H]1CO[C@@H]2[C@@H](O)CO[C@@H]21 YWXYYJSYQOXTPL-SLPGGIOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000004021 metal welding Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/102—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure
- H01M50/109—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure of button or coin shape
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/183—Sealing members
- H01M50/184—Sealing members characterised by their shape or structure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/183—Sealing members
- H01M50/186—Sealing members characterised by the disposition of the sealing members
-
- 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 invention relates to the technical field of lithium-ion batteries, in particular to a tabless lithium-ion battery and a manufacturing method thereof.
- the conventional lithium-ion battery manufacturing process includes a welding process; for a single tab cylindrical winding battery, usually a positive tab is directly welded on the positive current collector, and a negative tab is welded on the negative current collector, and then respectively Weld the positive tab to the positive conductive shell, and weld the negative tab to the negative conductive shell; for multi-tab soft-pack stacked batteries, first, pre-set the positive tab group reserved on the positive current collector.
- welding, and then weld the positive tab to the positive tab group secondly, pre-weld the negative tab group reserved on the negative current collector, and then weld the negative tab to the negative tab group, finally, pass Hot-melt the tab glue on the positive tab and the negative tab to seal the battery, and protrude the positive tab or negative tab from the inside of the cell.
- the current tab welding method is usually ultrasonic welding. Metal welding slag is likely to be generated during the welding process. If it falls into the battery cell, it may cause a safety accident, and the quality of tab welding is not easy to control. Destructive tests are usually used to evaluate tabs Whether the welding is reliable, in addition, the welding process is cumbersome, which affects the manufacturing efficiency, and will inevitably produce some substandard products, which affects the yield rate of the cell production.
- Chinese patent CN110752401A provides a button battery and its manufacturing method.
- the specific implementation method is: coating positive electrode slurry on one side of the positive electrode current collector, and the other side is an empty foil area; one side of the negative electrode current collector is an empty foil area, The other side is coated with the negative electrode slurry, and then the positive electrode sheet, the negative electrode sheet and the separator are wound.
- the positive electrode empty foil area and the negative electrode empty foil area protrude from both sides of the winding core respectively, and then are connected with the positive electrode conductive case body and the negative conductive case are in direct contact; the edge of the foil has an interference fit with the positive conductive case and the negative conductive case, and the edge of the foil is bent and deformed to ensure tight contact with the positive conductive case and the negative conductive case contact to form a charging or discharging circuit; the manufacturing method of the battery can not only improve the production efficiency, but also improve the rate performance of the battery.
- the above-mentioned manufacturing method simplifies the existing process and can improve the battery manufacturing efficiency, since the positive pole piece and the negative pole piece are misplaced and wound, when squeezed by the conductive shell, the internal pole pieces are easily misplaced, resulting in electrochemical damage of the battery. The performance is degraded, and the positive electrode empty foil area and the negative electrode empty foil area are directly connected in contact with the positive electrode conductive casing and the negative electrode conductive casing, and the contact reliability is poor, which will affect the electrochemical performance.
- the purpose of the present invention is to overcome the above-mentioned defects in the prior art, provide a lithium-ion battery without tabs and its manufacturing method; make the connection between the positive pole piece and the negative pole piece and the conductive shell more reliable, and the internal pole piece is not easy Misalignment ensures the normal performance of the electrochemical performance, improves the safety performance of the battery, and can also avoid the risk of short circuit caused by the misalignment of the pole pieces.
- the present invention provides a lithium-ion battery without tabs, comprising a positive electrode conductive case and a negative electrode conductive case, the positive electrode conductive case is buckled inside the negative electrode conductive case to form an airtight cavity, so The inside of the cavity is equipped with an electric core and an electrolyte, an insulating sealing ring is provided between the positive electrode conductive shell and the negative electrode conductive shell, and the electric core includes a positive pole piece, a Negative electrode sheet and the diaphragm installed between the positive electrode sheet and the negative electrode sheet; the positive electrode sheet includes a positive electrode collector and a positive electrode coating layer, the negative electrode sheet includes a negative electrode collector and a negative electrode coating layer, the Both the positive electrode conductive shell and the negative electrode conductive shell are coated with a conductive adhesive layer, and the positive electrode current collector is closely connected to the positive electrode conductive shell through the conductive adhesive layer; the negative electrode current collector is tightly connected to the negative electrode conductive shell through the conductive adhesive layer. connect.
- the positive electrode coating layer is formed by coating a positive electrode active material member on one or both sides of the positive electrode collector; the negative electrode coating layer is formed by coating a negative electrode active material member on one or both sides of the negative electrode collector One or both sides of the positive electrode coating layer and the negative electrode coating layer are coated with an insulating coating, and the insulating coating is coated on the positive electrode current collector and the negative electrode current collector.
- an insulating tape is attached to the surface of the insulating coating, and the insulating tape wraps one end of the positive electrode collector or the negative electrode collector.
- the conductive adhesive layer includes a resin base layer and conductive particles filled inside the resin base layer;
- the resin base layer includes one or more of epoxy resin material components, silicone resin material components, polyimide resin material components, phenolic resin material components, polyurethane resin material components, and acrylic resin material components;
- the conductive particles include nickel powder, carbonyl nickel powder, conductive silver paste, silver-coated copper powder, silver-coated glass, carbon nanotubes, conductive carbon black, conductive graphite, polythiophene, Au, Ag, Cu, Al, Zn, Fe , Ni, C and one or more of some conductive compounds.
- the thickness of the conductive adhesive layer is between 1-200um.
- the insulating coating is a boehmite material component or a ceramic material component.
- the thickness of the insulating coating is between 0-150um; the thickness of the insulating tape is between 5-40um.
- the positive electrode current collector and the negative electrode current collector have the same length and width, and the negative electrode coating layer completely covers the positive electrode coating layer.
- the separator completely covers the negative electrode coating layer and the positive electrode coating layer, and the width of the separator is 0.1-20mm smaller than the width of the positive electrode current collector or the negative electrode current collector.
- the present invention also provides a method for making the aforementioned electrodeless lithium-ion battery, comprising the following steps:
- Step S1 Winding the positive pole piece, the separator and the negative pole piece to make a battery cell or stacking it to make a battery cell;
- Step S2 Coating a layer of conductive adhesive layer inside the positive electrode conductive shell and the negative electrode conductive shell; and putting the cell into the positive electrode conductive shell and the negative electrode conductive shell;
- the positive electrode conductive casing is tightly connected;
- the negative electrode current collector is tightly connected to the negative electrode conductive casing through a conductive adhesive layer;
- Step S3 fasten the positive conductive shell on the negative conductive shell; fill the closed cavity formed by the positive conductive shell and the negative conductive shell with electrolyte; between the positive conductive shell and the negative conductive shell, An insulating sealing ring is placed between them to form a closed electrodeless lithium-ion battery.
- a conductive adhesive layer is coated inside the positive electrode conductive case and the negative electrode conductive case, and the positive electrode current collector is tightly connected to the positive electrode conductive case, and the negative electrode current collector is tightly connected to the negative electrode conductive case through the conductive adhesive layer.
- the positive current collector or the negative current collector can be inserted into the inside of the conductive adhesive layer; or the positive current collector or the negative current collector is bonded on the conductive adhesive layer ; Make the connection between the positive pole piece and the negative pole piece and the conductive shell more reliable, and the conductive adhesive layer also has the function of fixing the positive current collector or the negative current collector, so that the internal positive current collector or negative current collector is fixed more firmly , so that the positive pole piece and the negative pole piece are not easy to be dislocated.
- the area of the negative electrode coating layer in the present invention is larger than the area of the positive electrode coating layer, and the tolerance design ensures that the negative electrode coating layer completely covers the positive electrode coating layer to ensure normal electrochemical performance.
- the present invention improves the insulation performance of the positive electrode sheet and the negative electrode sheet by coating one or both sides of the positive electrode coating layer and the negative electrode coating layer with an insulating coating layer, and improves the safety performance of the battery.
- Insulating adhesive paper is also attached to the surface of the coating, and the insulating adhesive paper wraps one end of the positive electrode current collector or the negative electrode current collector, which can also avoid the short circuit risk caused by the misalignment of the pole pieces.
- Fig. 1 is a schematic sectional view of a tabless lithium-ion battery provided by the present invention
- Fig. 2 is a schematic cross-sectional view of the positive pole piece provided by the present invention.
- Fig. 3 is a schematic cross-sectional view of the negative electrode sheet provided by the present invention.
- Embodiment 1 of the present invention provides a tabless lithium-ion battery.
- the electrodeless lithium-ion battery includes a positive electrode conductive case 11 and a negative electrode conductive case 12, the positive electrode conductive case 11 is fastened inside the negative electrode conductive case 12, and the two are fastened together to form a sealed cavity inside , the inside of the cavity is equipped with a battery cell 2 and an electrolyte, and an insulating sealing ring 13 is provided between the positive electrode conductive shell 11 and the negative electrode conductive shell 12.
- the negative electrode The size of the conductive shell 12 is larger than the size of the positive conductive shell 11, and the positive conductive shell 11 is installed inside the negative conductive shell 12. In other embodiments, the size of the positive conductive shell 11 can also be larger than The size of the negative electrode conductive casing 12 , the negative electrode conductive casing 12 is installed inside the positive electrode conductive casing 11 .
- the battery core 2 includes a positive pole piece 4, a negative pole piece 5 arranged on one side of the positive pole piece 4, and a diaphragm 6 arranged between the positive pole piece 4 and the negative pole piece 5;
- the positive electrode sheet 4 includes a positive electrode collector 41 and a positive electrode coating layer 42.
- the negative electrode sheet 5 includes a negative electrode collector 51 and a negative electrode coating layer 52.
- the positive electrode coating layer 42 is formed by coating a positive electrode active material member on one or both sides of the positive electrode current collector 41; in this embodiment, both sides of the positive electrode current collector 41 are equipped with positive electrode coating layers.
- the negative electrode coating layer 52 is formed by coating one or both sides of the negative electrode current collector 51 by the negative electrode active material member; in this embodiment, both sides of the negative electrode current collector 51 are equipped with Negative electrode coating layer 52; one or both sides of the positive electrode coating layer 42 and the negative electrode coating layer 52 are coated with an insulating coating 7, and the insulating coating 7 is coated on the positive electrode current collector 4 or the negative electrode current collector 5; the positive electrode current collector 4 or the negative electrode current collector 5 coated with the insulating coating 7 makes the positive electrode current collector 4 or the negative electrode current collector 5 more orderly.
- a filler that can improve the stability of the structure of the positive pole piece 4 and the negative pole piece 5; improve the insulation performance of the positive pole piece 4 and the negative pole piece 5, and improve the safety performance of the battery; further, the insulating coating
- the layer 7 is a boehmite material component or a ceramic material component; the thickness of the insulating coating 7 is between 0 and 150um.
- both the positive electrode conductive casing 11 and the negative electrode conductive casing 12 are coated with a conductive adhesive layer 3, and the positive electrode current collector 41 is tightly connected to the positive electrode conductive casing 11 through the conductive adhesive layer 3;
- the negative electrode collector 51 is tightly connected to the negative electrode conductive casing 12 through the conductive adhesive layer 3, so that there is no need to weld the tabs on the positive electrode sheet 4 and the negative electrode sheet 5, and the positive electrode collector 41 or the negative electrode collector 51 can be inserted to the inside of the conductive adhesive layer 3; or the positive electrode current collector 41 or the negative electrode current collector 51 is bonded on the conductive adhesive layer 3; making the connection between the positive pole piece 4 and the negative pole piece 5 and the conductive shell more reliable, the The conductive adhesive layer 3 also has the function of fixing the positive electrode collector 41 or the negative electrode collector 51, so that the internal positive electrode collector 41 or the negative electrode collector 51 is fixed more firmly, so that the positive electrode sheet 4 and the negative electrode sheet 5 are not easy to be dislocated.
- an insulating tape 8 is attached to the surface of the insulating coating 7, and the insulating tape 8 wraps one end of the positive electrode collector 41 or the negative electrode collector 51; further, the The thickness of the insulating tape 8 is between 5 and 40um; the insulating tape 8 has an insulating function, which can avoid indirect contact between the positive current collector 41 and the negative current collector 51, and can also avoid the short circuit risk caused by the dislocation of the pole pieces. .
- the conductive adhesive layer 3 includes a resin base layer and conductive particles filled inside the resin base layer;
- the resin base layer includes but not limited to epoxy resin material components, silicone resin material components, polyimide resin material components, phenolic resin material components One or more of components, polyurethane resin material components, and acrylic resin material components;
- the conductive particles include but are not limited to nickel powder, carbonyl nickel powder, conductive silver paste, silver-coated copper powder, silver-coated glass, carbon nanotubes , Conductive carbon black, conductive graphite, polythiophene, Au, Ag, Cu, Al, Zn, Fe, Ni, C and one or more of some conductive compounds.
- the thickness of the conductive adhesive layer 3 is between 1 and 200um, and the positive electrode current collector 41 or the negative electrode current collector 51 is indirectly connected to the positive electrode conductive case 11 or the negative electrode conductive case 12 through the conductive adhesive layer 3, thereby improving The contact reliability is improved, and the contact resistance between the positive electrode current collector 41 or the negative electrode current collector 51 and the positive electrode conductive casing 11 or the negative electrode conductive casing 12 can be reduced, which is more conducive to the electrical performance of the battery.
- the length and width of the positive electrode collector 41 and the negative electrode collector 51 are the same, which is more conducive to the precise positioning of the positive electrode sheet 4 and the negative electrode sheet 5, and the tolerance design ensures that the negative electrode coating layer 51 is completely Covering the positive electrode coating layer 42 ensures normal electrochemical performance.
- the separator 6 completely covers the negative electrode coating layer 51 and the positive electrode coating layer 42, and the width of the separator 6 is 0.1 to 20 mm smaller than the width of the positive electrode current collector 41 or the negative electrode current collector 51; adopt the above design
- the separator 6 can be prevented from affecting the contact between the positive electrode collector 41 or the negative electrode collector 51 and the conductive adhesive layer 3 .
- Embodiment 2 of the present invention provides a method for manufacturing a tabless lithium-ion battery as described in Embodiment 1, which includes the following steps:
- Step S1 Prepare the positive electrode active material member and the negative electrode active material member; coat the positive electrode active material member on one or both sides of the positive electrode current collector 41 to form the positive electrode coating layer 42; coat the negative electrode active material material member
- the negative electrode coating layer 52 is formed on one side or both sides of the negative electrode current collector 51 .
- Step S2 The surface of the positive electrode current collector 41 is not completely coated with positive electrode active material components, and there is still a part of the empty foil area; at the same time, the surface of the negative electrode current collector 51 is not completely coated with negative electrode active material components, there are also A part of the empty foil area; the empty foil area is located on one or both sides of the positive electrode coating layer 42 or the negative electrode coating layer 52, and the empty foil area is coated with an insulating coating 7, specifically, as shown in Figures 2 and 3 As shown, one or both sides of the positive electrode coating layer 42 and the negative electrode coating layer 52 are coated with an insulating coating 7, and the insulating coating 7 is coated on the positive electrode current collector 4 and the negative electrode current collector 5. .
- Step S3 Paste insulating tape 8 on the surface of the insulating coating 7, and the insulating tape 8 wraps one end of the positive electrode collector 41 or the negative electrode collector 51; the other end is reserved.
- Step S4 Wind the positive pole piece 4, the separator 6 and the negative pole piece 5 to make the battery cell 2 or stack it to make the battery cell 2; specifically, if the shape of the battery cell 2 is a cylinder, the positive pole piece can be directly 4.
- the diaphragm 6 and the negative pole piece 5 are wound and formed; the positive pole piece 4, the diaphragm 6 and the negative pole piece 5 can also be made into a circle and stacked; if the shape of the battery cell 2 is a cuboid; the positive pole can be The pole piece 4, the separator 6 and the negative pole piece 5 are made into rectangles and stacked.
- Step S5 Coating a layer of conductive adhesive layer 3 inside the positive conductive casing 11 and the negative conductive casing 12; and putting the battery cell 2 into the positive conductive casing 11 and the negative conductive casing 12;
- the fluid 41 is tightly connected to the positive electrode conductive case 11 through the conductive adhesive layer 3 ;
- the negative electrode current collector 51 is closely connected to the negative electrode conductive case 12 through the conductive adhesive layer 3 .
- Step S6 Fasten the positive conductive casing 11 on the negative conductive casing 12; and fill the closed cavity formed by the positive conductive casing 11 and the negative conductive casing 12 with electrolyte; An insulating sealing ring 13 is placed between the negative electrode conductive shells 12, and then sealed with sealing oil to form a closed electrodeless lithium-ion battery.
- Embodiment 3 of the present invention provides a detailed description of Embodiment 2.
- positive electrode active material slurry and negative electrode active material slurry are prepared.
- the positive electrode active material slurry is coated on the positive electrode current collector 41 to form the positive electrode coating layer 42 ; the negative electrode active material slurry is coated on the negative electrode current collector 51 to form the negative electrode coating layer 52 .
- the main component of the positive electrode active material slurry is lithium cobaltate, the surface density is 12.10mg/cm2, and the compacted density is 4.15g/cm3.
- the main component of the negative electrode active material slurry is artificial graphite, the surface density is 7.11mg/cm2, and the compacted density is 1.50g/cm3.
- An insulating coating 7 made of ceramic material is coated on both sides of the positive electrode coating 42 , the thickness of the insulating coating 7 is 35 ⁇ m, and a 2 mm empty foil area is reserved on one edge of the insulating coating 7 .
- An insulating coating 7 made of ceramic material is coated on both sides of the negative electrode coating 52 , the thickness of the insulating coating 7 is 35 ⁇ m, and a 2 mm empty foil area is reserved on one edge of the insulating coating 7 .
- the insulating tape 8 is pasted on the surface of the insulating coating 7, and the thickness of the insulating tape 8 is 9um.
- the positive electrode sheet 4 , the separator 6 and the negative electrode sheet 5 are wound to form the cell 2 .
- the battery cell 2 is placed inside the positive conductive casing 11 and the negative conductive casing 12 whose inner surfaces are pre-coated with a conductive adhesive layer 3, the thickness of the conductive adhesive layer 3 is 5um.
- the processes of baking, liquid injection, sealing, formation, volume separation, and aging are carried out.
Abstract
本发明公开了一种无极耳锂离子电池及其制作方法，所述无极耳锂离子电池包括正极导电壳体和负极导电壳体，所述正极导电壳体扣合在负极导电壳体内侧，形成密闭的空腔，所述空腔内部装设有电芯和电解液，所述正极导电壳体和负极导电壳体之间设有绝缘密封圈，所述电芯包括正极极片、负极极片和隔膜；所述正极极片包括正极集流体和正极涂覆层，所述负极极片包括负极集流体和负极涂覆层，所述正极导电壳体和负极导电壳体内部都涂覆有导电胶层，所述正极集流体和负极集流体通过导电胶层分别与正极导电壳体和负极导电壳体紧密连接；本发明使得正极极片和负极极片与导电壳体之间连接更加可靠，保证电化学性能正常发挥，提升了电池安全性能。
Description
本发明涉及锂离子电池技术领域，特别涉及一种无极耳锂离子电池及其制作方法。
常规的锂离子电池制造工艺中都包括焊接工序；对于单极耳圆柱形卷绕电池，通常是直接在正极集流体上焊接一个正极极耳，负极集流体上焊接一个负极极耳，然后再分别将正极极耳焊接在正极导电壳体上，负极极耳焊接在负极导电壳体上；对于多极耳软包堆叠电池，首先，先将正极集流体上预留的正极极耳群进行一次预焊，再将正极极耳焊接在正极极耳群上，其次，将负极集流体上预留的负极极耳群进行一次预焊，再将负极极耳焊接在负极极耳群上，最后，通过将正极极耳和负极极耳上的极耳胶热熔实现电池的密封，将正极极耳或者负极极耳从电芯内部向外伸出。
目前的极耳焊接方法通常是超声波焊接，在焊接过程中容易产生金属焊渣，如果掉入电芯内部可能引发安全事故，并且极耳焊接品质不易管控，通常是采用破坏性试验来评估极耳焊接是否可靠，此外，焊接过程繁琐，影响制造效率，且不可避免的会产生部分不合格品，影响电芯制作的良品率。
中国专利CN110752401A提供了一种扣式电池及其制作方法，具体实施方法是：在正极集流体一侧涂覆正极浆料，另一侧为空箔区；负极集流体一侧为空箔区，另一侧涂覆负极浆料，然后将正极极片、负极极片和隔离膜进行卷绕，所述正极空箔区和负极空箔区分别从卷芯两侧伸出，然后与正极导电壳体和负极导电壳体直接接触；箔材边缘与正极导电壳体和负极导电壳体之间的过盈配合，且箔材边缘弯曲变形以确保与正极导电壳体和负极导电壳体之间紧密接触，形成充电或者放电回路；该电池制作方法既能提高生产效率，又能提高电池的倍率性能。
上述制作方法虽然简化了现有工艺，能够提升电池制造效率，但是由于正极极片和负极极片是错位卷绕，当受到导电壳体挤压时，内部极片容易错位，导致电池的电化学性能劣化，并且正极空箔区和负极空箔区直接与正极导电壳体和负极导电壳体接触式连接，接触可靠性较差，会影响电化学性能发挥。
本发明的目的在于克服现有技术中的上述缺陷，提供一种无极耳锂离子电池及其制作方法；使得正极极片和负极极片与导电壳体之间连接更加可靠，并且内部极片不易错位，保证电化学性能正常发挥，提升了电池安全性能，也可以规避极片错位导致的短路风险。
为实现上述目的，本发明提供了一种无极耳锂离子电池，包括正极导电壳体和负极导电壳体，所述正极导电壳体扣合在负极导电壳体内侧，形成密闭的空腔，所述空腔内部装设有电芯和电解液，所述正极导电壳体和负极导电壳体之间设有绝缘密封圈，所述电芯包括正极极片、装设在正极极片一侧的负极极片和装设在正极极片和负极极片之间的隔膜；所述正极极片包括正极集流体和正极涂覆层，所述负极极片包括负极集流体和负极涂覆层，所述正极导电壳体和负极导电壳体内部都涂覆有导电胶层，所述正极集流体通过导电胶层与正极导电壳体紧密连接；所述负极集流体通过导电胶层与负极导电壳体紧密连接。
作为优选的，所述正极涂覆层由正极活性物质材料构件在正极集流体一侧或两侧涂覆而成；所述负极涂覆层由负极活性物质材料构件在负极集流体一侧或两侧涂覆而成；所述正极涂覆层和负极涂覆层的一侧或者两侧涂覆有绝缘涂层，所述绝缘涂层涂覆在正极集流体和负极集流体上。
作为优选的，所述绝缘涂层表面上还贴附有绝缘胶纸，所述绝缘胶纸将正极集流体或者负极集流体的一端进行包裹。
作为优选的，所述导电胶层包括树脂基层和填充在树脂基层内部的导电粒子；
所述树脂基层包括环氧树脂材料构件、有机硅树脂材料构件、聚酰亚胺树脂材料构件、酚醛树脂材料构件、聚氨酯树脂材料构件、丙烯酸树脂材料构件中的一种或多种；
所述导电粒子包括镍粉、羰基镍粉、导电银浆、银包铜粉、银包玻璃、碳纳米管、导电炭黑、导电石墨、聚噻吩、Au、Ag、Cu、Al、Zn、Fe、Ni、C及一些导电化合物中的一种或多种。
作为优选的，所述导电胶层的厚度在1~200um之间。
作为优选的，所述绝缘涂层为勃姆石材料构件或者陶瓷材料构件。
作为优选的，所述绝缘涂层的厚度在0~150um之间；所述绝缘胶纸的厚度在5~40um之间。
作为优选的，所述正极集流体和负极集流体的长度和宽度都相同，所述负极涂覆层完全覆盖正极涂覆层。
作为优选的，所述隔膜完全覆盖负极涂覆层和正极涂覆层，所述隔膜的宽度比正极集流体或者负极集流体的宽度小0.1~20mm。
本发明还提供了一种制作上述所述的一种无极耳锂离子电池的方法，包括以下步骤：
步骤S1：将正极极片、隔膜和负极极片卷绕制成电芯或者堆叠制成电芯；
步骤S2：在正极导电壳体和负极导电壳体内部涂覆一层导电胶层；并将电芯放入到正极导电壳体和负极导电壳体内部；所述正极集流体通过导电胶层与正极导电壳体紧密连接；所述负极集流体通过导电胶层与负极导电壳体紧密连接；
步骤S3：将正极导电壳体扣合在负极导电壳体上；并向正极导电壳体和负极导电壳体形成的密闭空腔内填入电解液；在正极导电壳体和负极导电壳体之间放置绝缘密封圈，形成封闭的无极耳锂离子电池。
1、本发明通过在正极导电壳体和负极导电壳体的内部涂覆导电胶层，并且通过导电胶层将正极集流体与正极导电壳体紧密连接、负极集流体与负极导电壳体紧密连接；从而无需在正极极片和负极极片上焊接极耳，并且所述正极集流体或者负极集流体可以插入到导电胶层内部；或者所述正极集流体或者负极集流体粘接在导电胶层上；使得正极极片和负极极片与导电壳体之间连接更加可靠，并且导电胶层还具有将正极集流体或者负极集流体固定的作用，使得内部的正极集流体或者负极集流体固定更加牢固，从而使得正极极片和负极极片不易错位。
2、本发明所述负极涂覆层的面积大于正极涂覆层的面积，通过公差设计确保负极涂覆层完全覆盖正极涂覆层，保证电化学性能正常发挥。
3、本发明通过在正极涂覆层和负极涂覆层的一侧或者两侧涂覆有绝缘涂层，提升了正极极片和负极极片的绝缘性能，提升了电池安全性能，所述绝缘涂层表面上还贴附有绝缘胶纸，所述绝缘胶纸将正极集流体或者负极集流体的一端进行包裹，也可以规避极片错位导致的短路风险。
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本发明提供的一种无极耳锂离子电池的剖面示意图；
图2是本发明提供的正极极片的剖面示意图；
图3是本发明提供的负极极片的剖面示意图。
在图中包括有：
11-正极导电壳体、12-负极导电壳体、2-电芯、13-绝缘密封圈、4-正极极片、5-负极极片、6-隔膜、41-正极集流体、42-正极涂覆层、51-负极集流体、52-负极涂覆层、3-导电胶层、7-绝缘涂层、8-绝缘胶纸。
下面将结合本发明本实施方式中的附图，对本发明本实施方式中的技术方案进行清楚、完整地描述，显然，所描述的本实施方式是本发明的一种实施方式，而不是全部的本实施方式。基于本发明中的本实施方式，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本实施方式，都属于本发明保护的范围。
实施例一
请参考图1至图3，本发明实施例一提供了一种无极耳锂离子电池。
所述无极耳锂离子电池，包括正极导电壳体11和负极导电壳体12，所述正极导电壳体11扣合在负极导电壳体12内侧，两者扣合在一起后内部形成密封空腔，所述空腔内部装设有电芯2和电解液，所述正极导电壳体11和负极导电壳体12之间设有绝缘密封圈13，进一步的，在本实施例中，所述负极导电壳体12的尺寸大于正极导电壳体11的尺寸，所述正极导电壳体11装设在负极导电壳体12内部，在其他实施例中，所述正极导电壳体11的尺寸也可以大于负极导电壳体12的尺寸，所述负极导电壳体12装设在正极导电壳体11内部。
如图1所示，所述电芯2包括正极极片4、装设在正极极片4一侧的负极极片5和装设在正极极片4和负极极片5之间的隔膜6；如图2所示，所述正极极片4包括正极集流体41和正极涂覆层42，如图3所示，所述负极极片5包括负极集流体51和负极涂覆层52，具体的，所述正极涂覆层42由正极活性物质材料构件在正极集流体41一侧或两侧涂覆而成；在本实施例中，所述正极集流体41的两侧都装设有正极涂覆层42；所述负极涂覆层52由负极活性物质材料构件在负极集流体51一侧或两侧涂覆而成；在本实施例中，所述负极集流体51的两侧都装设有负极涂覆层52；所述正极涂覆层42和负极涂覆层52的一侧或者两侧涂覆有绝缘涂层7，所述绝缘涂层7涂覆在正极集流体4或者负极集流体5上；涂覆有绝缘涂层7的正极集流体4或者负极集流体5，使得正极集流体4或者负极集流体5更加整齐，所述绝缘涂层7具有提高电池安全性能的作用，同时作为一种填充物，可提高正极极片4和负极极片5结构的稳定性；提升了正极极片4和负极极片5的绝缘性能，提升了电池安全性能；更进一步的，所述绝缘涂层7为勃姆石材料构件或者陶瓷材料构件；所述绝缘涂层7的厚度在0~150um之间。
如图1所示，所述正极导电壳体11和负极导电壳体12内部都涂覆有导电胶层3，所述正极集流体41通过导电胶层3与正极导电壳体11紧密连接；所述负极集流体51通过导电胶层3与负极导电壳体12紧密连接，从而无需在正极极片4和负极极片5上焊接极耳，并且所述正极集流体41或者负极集流体51可以插入到导电胶层3内部；或者所述正极集流体41或者负极集流体51粘接在导电胶层3上；使得正极极片4和负极极片5与导电壳体之间连接更加可靠，所述导电胶层3还具有将正极集流体41或者负极集流体51固定的作用，使得内部的正极集流体41或者负极集流体51固定更加牢固，从而使得正极极片4和负极极片5不易错位。
如图2和3所示，所述绝缘涂层7表面上还贴附有绝缘胶纸8，所述绝缘胶纸8将正极集流体41或者负极集流体51的一端进行包裹；进一步的，所述绝缘胶纸8的厚度在5~40um之间；所述绝缘胶纸8具有绝缘功能，能够避免正极集流体41和负极集流体51之间间接接触，也可以规避极片错位导致的短路风险。
所述导电胶层3包括树脂基层和填充在树脂基层内部的导电粒子；所述树脂基层包括但不限于环氧树脂材料构件、有机硅树脂材料构件、聚酰亚胺树脂材料构件、酚醛树脂材料构件、聚氨酯树脂材料构件、丙烯酸树脂材料构件中的一种或多种；所述导电粒子包括但不限于镍粉、羰基镍粉、导电银浆、银包铜粉、银包玻璃、碳纳米管、导电炭黑、导电石墨、聚噻吩、Au、Ag、Cu、Al、Zn、Fe、Ni、C及一些导电化合物中的一种或多种。
进一步的，所述导电胶层3的厚度在1~200um之间，通过导电胶层3将正极集流体41或者负极集流体51分别与正极导电壳体11或者负极导电壳体12间接连接，提高了接触的可靠性，并且还可以降低正极集流体41或者负极集流体51与正极导电壳体11或者负极导电壳体12的接触阻抗，更有利于电池的电性能发挥。
如图1所示，所述正极集流体41和负极集流体51的长度和宽度都相同，更有利于正极极片4和负极极片5的精确定位，通过公差设计确保负极涂覆层51完全覆盖正极涂覆层42，保证电化学性能正常发挥。
如图1所示，所述隔膜6完全覆盖负极涂覆层51和正极涂覆层42，所述隔膜6的宽度比正极集流体41或者负极集流体51的宽度小0.1~20mm；采用上述设计可以避免隔膜6影响正极集流体41或者负极集流体51与导电胶层3的接触。
实施例二
请参考图1至图3，本发明实施例二提供了一种制作实施例一所述的一种无极耳锂离子电池的方法：包括以下步骤：
步骤S1：进行制备正极活性物质材料构件和负极活性物质材料构件；将正极活性物质材料构件涂覆在正极集流体41一侧或两侧，形成正极涂覆层42；将负极活性物质材料构件涂覆在负极集流体51一侧或两侧，形成负极涂覆层52。
步骤S2：所述正极集流体41表面并没有全部涂覆正极活性物质材料构件，还存在一部分空箔区；同时所述负极集流体51表面上也没有全部涂覆负极活性物质材料构件，也存在一部分空箔区；所述空箔区位于正极涂覆层42或者负极涂覆层52的一侧或者两侧，所述空箔区涂覆有绝缘涂层7，具体的，如图2和3所示，在所述正极涂覆层42和负极涂覆层52的一侧或者两侧涂覆有绝缘涂层7，所述绝缘涂层7涂覆在正极集流体4和负极集流体5上。
步骤S3：在所述绝缘涂层7表面上贴附绝缘胶纸8，所述绝缘胶纸8将正极集流体41或者负极集流体51的一端进行包裹；另一端进行预留。
步骤S4：将正极极片4、隔膜6和负极极片5卷绕制成电芯2或者堆叠制成电芯2；具体的，如果电芯2的形状是圆柱体，可以直接将正极极片4、隔膜6和负极极片5进行卷绕成型；也可以将正极极片4、隔膜6和负极极片5制成圆形，进行堆叠成型；如果电芯2的形状是长方体；可以将正极极片4、隔膜6和负极极片5制成长方形，进行堆叠成型。
步骤S5：在正极导电壳体11和负极导电壳体12内部涂覆一层导电胶层3；并将电芯2放入到正极导电壳体11和负极导电壳体12内部；所述正极集流体41通过导电胶层3与正极导电壳体11紧密连接；所述负极集流体51通过导电胶层3与负极导电壳体12紧密连接。
步骤S6：将正极导电壳体11扣合在负极导电壳体12上；并向正极导电壳体11和负极导电壳体12形成的密闭空腔内填入电解液；在正极导电壳体11和负极导电壳体12之间放置绝缘密封圈13，再用密封油进行密封，形成封闭的无极耳锂离子电池。
实施例三
本发明实施例三提供了是对实施例二的详细说明。
首先制备正极活性物质浆料和负极活性物质浆料。
将正极活性物质浆料涂覆在正极集流体41上，形成正极涂覆层42；将负极活性物质浆料涂覆在负极集流体51上，形成负极涂覆层52。
所述正极活性物质浆料的主要成分为钴酸锂，面密度为12.10mg/cm2，压实密度为4.15g/cm3。
所述负极活性物质浆料的主要成分为人造石墨，面密度为7.11mg/cm2，压实密度为1.50g/cm3。
由陶瓷材料构件制成的绝缘涂层7涂覆在正极涂覆层42两侧，所述绝缘涂层7的厚度为35um，所述绝缘涂层7一侧边缘预留2mm空箔区域。
由陶瓷材料构件制成的绝缘涂层7涂覆在负极涂覆层52两侧，所述绝缘涂层7的厚度为35um，所述绝缘涂层7一侧边缘预留2mm空箔区域。
所述绝缘胶纸8贴附在绝缘涂层7表面上，所述绝缘胶纸8的厚度为9um。
将正极极片4、隔膜6和负极极片5卷绕制成电芯2。
将电芯2放置在内表面预先涂覆有导电胶层3的正极导电壳体11和负极导电壳体12内部，所述导电胶层3的厚度为5um。
按常规锂离子制造工艺进行烘烤、注液、封口、化成、分容、老化等工序。
最终得到如图1所示的一种无极耳卷绕锂离子电池。
上述实施例为本发明较佳的实施方式，但本发明的实施方式并不受上述实施例的限制，其他的任何未背离本发明的精神实质与原理下所作的改变、修饰、替代、组合、简化，均应为等效的置换方式，都包含在本发明的保护范围之内。
Claims (10)
- 一种无极耳锂离子电池，其特征在于，包括正极导电壳体（11）和负极导电壳体（12），所述正极导电壳体（11）扣合在负极导电壳体（12）内侧，形成密闭的空腔，所述空腔内部装设有电芯（2）和电解液，所述正极导电壳体（11）和负极导电壳体（12）之间设有绝缘密封圈（13），所述电芯（2）包括正极极片（4）、装设在正极极片（4）一侧的负极极片（5）和装设在正极极片（4）和负极极片（5）之间的隔膜（6）；所述正极极片（4）包括正极集流体（41）和正极涂覆层（42），所述负极极片（5）包括负极集流体（51）和负极涂覆层（52），所述正极导电壳体（11）和负极导电壳体（12）内部都涂覆有导电胶层（3），所述正极集流体（41）通过导电胶层（3）与正极导电壳体（11）紧密连接；所述负极集流体（51）通过导电胶层（3）与负极导电壳体（12）紧密连接。
- 根据权利要求1所述的一种无极耳锂离子电池，其特征在于，所述正极涂覆层（42）由正极活性物质材料构件在正极集流体（41）一侧或两侧涂覆而成；所述负极涂覆层（52）由负极活性物质材料构件在负极集流体（51）一侧或两侧涂覆而成；所述正极涂覆层（42）和负极涂覆层（52）的一侧或者两侧涂覆有绝缘涂层（7），所述绝缘涂层（7）涂覆在正极集流体（4）和负极集流体（5）上。
- 根据权利要求2所述的一种无极耳锂离子电池，其特征在于，所述绝缘涂层（7）表面上还贴附有绝缘胶纸（8），所述绝缘胶纸（8）将正极集流体（41）或者负极集流体（51）的一端进行包裹。
- 根据权利要求1所述的一种无极耳锂离子电池，其特征在于，所述导电胶层（3）包括树脂基层和填充在树脂基层内部的导电粒子；所述树脂基层包括环氧树脂材料构件、有机硅树脂材料构件、聚酰亚胺树脂材料构件、酚醛树脂材料构件、聚氨酯树脂材料构件、丙烯酸树脂材料构件中的一种或多种；所述导电粒子包括镍粉、羰基镍粉、导电银浆、银包铜粉、银包玻璃、碳纳米管、导电炭黑、导电石墨、聚噻吩、Au、Ag、Cu、Al、Zn、Fe、Ni、C及一些导电化合物中的一种或多种。
- 根据权利要求1所述的一种无极耳锂离子电池，其特征在于，所述导电胶层（3）的厚度在1~200um之间。
- 根据权利要求2所述的一种无极耳锂离子电池，其特征在于，所述绝缘涂层（7）为勃姆石材料构件或者陶瓷材料构件。
- 根据权利要求3所述的一种无极耳锂离子电池，其特征在于，所述绝缘涂层（7）的厚度在0~150um之间；所述绝缘胶纸（8）的厚度在5~40um之间。
- 根据权利要求1所述的一种无极耳锂离子电池，其特征在于，所述正极集流体（41）和负极集流体（51）的长度和宽度都相同，所述负极涂覆层（51）完全覆盖正极涂覆层（42）。
- 根据权利要求1所述的一种无极耳锂离子电池，其特征在于，所述隔膜（6）完全覆盖负极涂覆层（51）和正极涂覆层（42），所述隔膜（6）的宽度比正极集流体（41）或者负极集流体（51）的宽度小0.1~20mm。
- 一种制作权利要求1-9任一项所述的一种无极耳锂离子电池的方法，其特征在于：包括以下步骤：步骤S1：将正极极片（4）、隔膜（6）和负极极片（5）卷绕制成电芯（2）或者堆叠制成电芯（2）；步骤S2：在正极导电壳体（11）和负极导电壳体（12）内部涂覆一层导电胶层（3）；并将电芯（2）放入到正极导电壳体（11）和负极导电壳体（12）内部；所述正极集流体（41）通过导电胶层（3）与正极导电壳体（11）紧密连接；所述负极集流体（51）通过导电胶层（3）与负极导电壳体（12）紧密连接；步骤S3：将正极导电壳体（11）扣合在负极导电壳体（12）上；并向正极导电壳体（11）和负极导电壳体（12）形成的密闭空腔内填入电解液；在正极导电壳体（11）和负极导电壳体（12）之间放置绝缘密封圈（13），形成封闭的无极耳锂离子电池。
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