CN111430639A - Preparation method of lithium ion cell composite sheet and preparation method of lithium ion battery - Google Patents
Preparation method of lithium ion cell composite sheet and preparation method of lithium ion battery Download PDFInfo
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- CN111430639A CN111430639A CN202010166394.3A CN202010166394A CN111430639A CN 111430639 A CN111430639 A CN 111430639A CN 202010166394 A CN202010166394 A CN 202010166394A CN 111430639 A CN111430639 A CN 111430639A
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- 239000002131 composite material Substances 0.000 title claims abstract description 55
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 49
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 41
- 238000002360 preparation method Methods 0.000 title claims abstract description 29
- 239000000463 material Substances 0.000 claims abstract description 77
- 239000012943 hotmelt Substances 0.000 claims abstract description 48
- 238000004804 winding Methods 0.000 claims abstract description 41
- 238000004519 manufacturing process Methods 0.000 claims abstract description 20
- 239000011248 coating agent Substances 0.000 claims abstract description 15
- 238000000576 coating method Methods 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims description 51
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 39
- 229910052744 lithium Inorganic materials 0.000 claims description 39
- 238000010030 laminating Methods 0.000 claims description 36
- 239000000758 substrate Substances 0.000 claims description 30
- 239000012528 membrane Substances 0.000 claims description 29
- 239000007774 positive electrode material Substances 0.000 claims description 29
- 239000011230 binding agent Substances 0.000 claims description 28
- 239000006258 conductive agent Substances 0.000 claims description 27
- 238000007789 sealing Methods 0.000 claims description 27
- 239000007773 negative electrode material Substances 0.000 claims description 26
- 238000000034 method Methods 0.000 claims description 17
- 239000002033 PVDF binder Substances 0.000 claims description 11
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 11
- 238000003825 pressing Methods 0.000 claims description 9
- 239000006229 carbon black Substances 0.000 claims description 8
- 229910021392 nanocarbon Inorganic materials 0.000 claims description 8
- 229920005569 poly(vinylidene fluoride-co-hexafluoropropylene) Polymers 0.000 claims description 7
- 150000001875 compounds Chemical class 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 5
- 229910002804 graphite Inorganic materials 0.000 claims description 5
- 239000010439 graphite Substances 0.000 claims description 5
- 230000001681 protective effect Effects 0.000 claims description 5
- 229910000572 Lithium Nickel Cobalt Manganese Oxide (NCM) Inorganic materials 0.000 claims description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 4
- HMDDXIMCDZRSNE-UHFFFAOYSA-N [C].[Si] Chemical compound [C].[Si] HMDDXIMCDZRSNE-UHFFFAOYSA-N 0.000 claims description 4
- FBDMTTNVIIVBKI-UHFFFAOYSA-N [O-2].[Mn+2].[Co+2].[Ni+2].[Li+] Chemical compound [O-2].[Mn+2].[Co+2].[Ni+2].[Li+] FBDMTTNVIIVBKI-UHFFFAOYSA-N 0.000 claims description 4
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 claims description 4
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 4
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 4
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 238000003475 lamination Methods 0.000 abstract description 7
- 239000011888 foil Substances 0.000 description 13
- 230000000712 assembly Effects 0.000 description 10
- 238000000429 assembly Methods 0.000 description 10
- 238000003466 welding Methods 0.000 description 8
- 238000005520 cutting process Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 239000000428 dust Substances 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 239000003792 electrolyte Substances 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 239000004831 Hot glue Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 239000011889 copper foil Substances 0.000 description 2
- 239000011267 electrode slurry Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- HFCVPDYCRZVZDF-UHFFFAOYSA-N [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O Chemical compound [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O HFCVPDYCRZVZDF-UHFFFAOYSA-N 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910002102 lithium manganese oxide Inorganic materials 0.000 description 1
- VLXXBCXTUVRROQ-UHFFFAOYSA-N lithium;oxido-oxo-(oxomanganiooxy)manganese Chemical compound [Li+].[O-][Mn](=O)O[Mn]=O VLXXBCXTUVRROQ-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
Images
Classifications
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/403—Manufacturing processes of separators, membranes or diaphragms
-
- 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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/46—Separators, membranes or diaphragms characterised by their combination with electrodes
-
- 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
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/46—Separators, membranes or diaphragms characterised by their combination with electrodes
- H01M50/461—Separators, membranes or diaphragms characterised by their combination with electrodes with adhesive layers between electrodes and separators
-
- 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
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention relates to a preparation method of a lithium ion cell composite sheet and a preparation method of a lithium ion battery, wherein the preparation method of the lithium ion cell composite sheet comprises the following steps: s1, manufacturing a positive plate coated with a positive material; s2, manufacturing a negative plate coated with a negative material; s3, providing a first diaphragm and a second diaphragm, coating hot melt materials on one side of the first diaphragm, and respectively coating hot melt materials on two sides of the second diaphragm; s4, stacking the first diaphragm coated with the hot melt material on one side to one side of the positive plate, arranging the side coated with the hot melt material of the first diaphragm opposite to the positive plate, stacking the second diaphragm coated with the hot melt material on two sides to the other side of the positive plate, stacking the negative plate to one side of the second diaphragm opposite to the positive plate, and forming the first diaphragm, the positive plate, the second diaphragm and the negative plate into an integral structure by hot lamination. The composite sheet prepared by the preparation method can improve the winding efficiency and avoid dislocation.
Description
Technical Field
The invention relates to a lithium battery, in particular to a preparation method of a lithium ion cell composite sheet and a preparation method of a lithium ion battery.
Background
In the traditional lithium battery manufacturing method, a tab is usually welded in an empty foil area of a pole piece, meanwhile, insulating gummed paper is pasted, and the tab is cut into one pole piece required by a winding process, when the traditional lithium battery is manufactured, the pole piece and a diaphragm manufactured by a sheet manufacturing machine are usually required to be placed on winding equipment, and then the positive pole piece, the negative pole piece and the diaphragm are wound together by winding, so that the positive pole piece, the negative pole piece and 2 layers of diaphragms are wound together, and a dislocation phenomenon is easy to occur, so that quality risks are caused; meanwhile, the contact chance of hands is increased, so that dust, water vapor and the like are easy to influence the quality of the lithium battery; further, the winding efficiency is low, and the labor cost is increased. Still exist among the correlation technique and adopt the lamination mode to form column electric core, adopt the electric core that the lamination mode made, produce pole piece burr easily and lead to risks such as battery low pressure short circuit, also produce the dislocation easily simultaneously and take place unpredictable's risk to this lamination production efficiency is low.
Disclosure of Invention
The invention aims to provide an improved preparation method of a lithium ion battery cell composite sheet, and further provides an improved preparation method of a lithium ion battery.
The technical scheme adopted by the invention for solving the technical problems is as follows: a preparation method for constructing a lithium ion battery core composite sheet comprises the following steps:
s1, manufacturing a positive plate coated with a positive material;
s2, manufacturing a negative plate coated with a negative material;
s3, providing a first diaphragm and a second diaphragm, coating hot melt materials on one side of the first diaphragm, and respectively coating the hot melt materials on two sides of the second diaphragm;
s4, coat the first diaphragm that hot melt material was scribbled to one side and will the one side that hot melt material was scribbled to first diaphragm with positive plate sets up relatively, coats both sides the second diaphragm of hot melt material stacks extremely the opposite side of positive plate, will negative pole piece stack extremely the second diaphragm is carried on the back in one side of positive plate, and will first diaphragm the positive plate the second diaphragm and the negative pole piece forms the compound piece of a body structure through hot compress.
Preferably, the step S1 includes the steps of:
s1.1, uniformly mixing a positive electrode active material, a conductive agent and a binder to prepare a positive electrode material;
s1.2, coating the positive electrode material on a positive electrode substrate;
s1.3, pressing the positive electrode substrate coated with the positive electrode material to obtain the positive electrode plate.
Preferably, the weight parts of the positive active material, the conductive agent and the binder are 94-98, 1-3 and 1-3 respectively;
the positive active material comprises one or more of lithium cobaltate, ternary lithium nickel cobalt manganese oxide and lithium manganate;
the binder comprises polyvinylidene fluoride;
the conductive agent includes nano carbon black.
Preferably, the step S2 includes the steps of:
s2.1, uniformly mixing the negative active material, the conductive agent and the binder to obtain a negative material;
s2.2, coating the negative electrode material on the negative electrode substrate;
s2.3, pressing the negative electrode substrate coated with the negative electrode material to obtain the negative electrode sheet.
Preferably, the weight parts of the negative active material, the conductive agent and the binder are 94-98, 1-3 and 1-3 respectively;
the negative active material comprises one or more of graphite, silicon carbon and lithium titanate;
the binder comprises one or more of polyvinylidene fluoride, styrene butadiene rubber and sodium carboxymethylcellulose;
the conductive agent includes nano carbon black.
Preferably, in the step S2, the hot melt material includes polyvinylidene fluoride-hexafluoropropylene copolymer.
Preferably, the step S4 includes the steps of:
s4.1, winding the positive plate prepared in the step S1 to form a positive plate roll, then placing the positive plate roll on a first feeding assembly of a laminating plate making device of a lithium battery, and then drawing the positive plate between two heating rollers of the laminating assembly;
s4.2, winding a first diaphragm coated with hot melt material on one side to form a first diaphragm roll, then placing the first diaphragm roll on a second feeding assembly of a laminating sheet making device of the lithium battery positioned on the outermost side, then drawing the first diaphragm between two heating rollers of the laminating assembly and stacking the first diaphragm to one side of the first diaphragm, wherein the side coated with the hot melt material on the first diaphragm is opposite to the positive plate;
s4.3, winding a second membrane coated with the hot-melt material on two sides to form a second membrane roll, then placing the second membrane roll on a second feeding assembly of a laminating sheet-making device of the lithium battery, wherein the second feeding assembly is positioned in the middle, and then drawing the second membrane between two heating rollers of the laminating assembly and laminating the second membrane to the other side of the positive plate;
s4.4, winding the negative plate prepared in the step S2 to form a negative plate roll, placing the negative plate roll on a third feeding assembly of a laminating plate manufacturing device of the lithium battery, and then pulling the negative plate to a position between two heating rollers of the laminating assembly and stacking the negative plate to the side, opposite to the positive plate, of the second diaphragm;
s4.5, starting the applying assembly, driving the first diaphragm, the positive plate, the second diaphragm and the negative plate to move forwards together through the rotation of the heating roller, heating the heating roller and applying pressure to the first diaphragm, the positive plate, the second diaphragm and the negative plate to enable the hot-melt material on the first diaphragm and the hot-melt material on the second diaphragm to be melted and enable the first diaphragm, the positive plate, the second diaphragm and the negative plate to be thermally applied to form an integrated composite sheet;
wherein the first membrane and the second membrane are aligned prior to the heat sealing.
Preferably, in the step S4, the heat sealing temperature is 45-85 ℃;
and/or the pressure applied to the composite sheet during hot compression is 1T-2T;
and/or a protective sleeve is sleeved on the heating roller of the applying assembly.
Preferably, in step S4.5, before starting the application assembly, a positive tab is further provided on the positive plate; and a negative electrode lug is arranged on the negative electrode sheet.
The invention also discloses a preparation method of the lithium ion battery, which is characterized by comprising the following steps of winding the composite sheet prepared by the preparation method of the lithium ion battery core composite sheet disclosed by the invention to form a battery core, putting the battery core into a battery shell, and then carrying out liquid injection and sealing to prepare the lithium ion battery. The preparation method of the lithium ion core composite sheet and the preparation method of the lithium ion battery have the following beneficial effects: according to the preparation method of the lithium ion cell composite sheet, the first diaphragm, the positive plate, the second diaphragm and the negative plate are heated to form the composite sheet of an integrated structure, the winding efficiency can be improved, the first diaphragm, the positive plate, the second diaphragm and the negative plate are prevented from being dislocated, meanwhile, the influence of dust and water vapor is avoided due to the fact that human hands are in contact with the composite sheet, the quality of the lithium battery is improved to the greatest extent, the die cutting process can be omitted, burrs can be reduced, and the risk of low-voltage fracture of the battery is avoided.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a schematic perspective view of a laminating sheet-making apparatus for making a cell composite sheet of a lithium ion battery according to the present invention;
FIG. 2 is an exploded view of a composite sheet made by the lay-up sheet-making apparatus for a lithium ion battery shown in FIG. 1;
fig. 3 is a cross-sectional view of the composite sheet of fig. 2;
fig. 4 is a process flow diagram of a method for preparing a lithium ion cell composite sheet of a lithium ion battery according to the present invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
Fig. 1 shows some preferred embodiments of the application sheet making apparatus for lithium batteries of the present invention. This a apply and close piece making equipment for lithium cell can be used to form compound piece 100 of an organic whole structure with first diaphragm 100b, positive plate 100a, second diaphragm 100d and the hot compress of negative pole piece 100c, and then the coiling equipment of can being convenient for is convoluteed, can improve coiling efficiency, avoid first diaphragm, positive plate, second diaphragm, the dislocation appears in the negative pole piece, reducible staff contact is advanced and avoid the influence of dust and steam simultaneously, realize furthest's improvement lithium cell's quality.
As shown in fig. 1, the laminating sheet manufacturing apparatus for lithium batteries may include a mounting frame 10, a first supply unit 20, two sets of second supply units 30, a third supply unit 40, and a heat laminating unit 50. The mounting frame 10 can be used for mounting the first supply assembly 20, the two sets of second supply assemblies 30, the third supply assembly 40 and the heat sealing assembly 50. The first supply assembly 20 may be disposed on the mounting frame 10, and may be used to supply a positive electrode sheet 100a, and the two sets of second supply assemblies 30 may be disposed on the mounting frame 10, and may be located at both sides of the first supply assembly 20, and may be used to supply a first separator 100a and a second separator 100b to both sides of the positive electrode sheet 100a, respectively. The third supply assembly 40 may be disposed on the mounting frame 10, may be disposed side by side with the first supply assembly 20, and may supply the negative electrode sheet 100c to a side of the second separator 100d opposite to the positive electrode sheet 100 a. This hot compress closes subassembly 50 can set up on this mounting bracket 10, and is located this direction of feed, and it can form an organic whole structure with overlapping first diaphragm 100b, positive plate 100a, second diaphragm 100 and negative pole piece 100c hot compress in proper order, and then can make compound piece 100 to be convenient for convolute.
Further, in some embodiments, the mount 10 may include a mounting plate that may be placed flat on some platforms or vertically on some platforms, although it will be appreciated that in other embodiments, the mount 10 may not be limited to including a mounting plate. The mounting plate may be a steel plate, it being understood that in some embodiments, the mounting plate may not be limited to steel plates.
Further, in some embodiments, the first feed assembly 20 may include a first feed roll 21. The first feed roll 21 may be disposed on the mounting plate in a direction perpendicular to the mounting plate. The first feed roll 21 may be a fixed roll that the positive electrode sheet roll may be placed on. When in use, the positive electrode sheet roll can be sleeved on the first feeding roller 21.
Further, in some embodiments, each set of the second feed assemblies 30 may include a second feed roll 31. The second feeding rollers 31 may be disposed on one side of the positive electrode sheet, and specifically, the second feeding rollers 31 of the two sets of second feeding assemblies 30 may be disposed on two sides of the positive electrode sheet 100a, may be disposed on the mounting plate along a direction perpendicular to the mounting plate, and may be fixed rollers, which are respectively disposed on the first separator roll and the second separator roll.
Further, in some embodiments, the third feed assembly 40 may include a third feed roll 41. The third feeding roller 41 may be disposed on a side of the second separator 100d opposite to the positive electrode sheet 100a, may be disposed on the mounting plate along a direction perpendicular to the mounting plate, and may be a fixed roller for the negative electrode sheet to be rolled.
Further, in some embodiments, the heat sealing assembly 50 may be spaced apart from the first, second, and third supply assemblies 20, 30, 40. The heat sealing assembly 50 may include two fixing frames 51, two heating rollers 52 disposed corresponding to the two fixing frames 51, and a driving mechanism correspondingly connected to the two heating rollers 52. The two fixing frames 51 can be disposed on the mounting frame 10, and they can be disposed side by side and spaced apart from each other, and they can be used for mounting the two heating rollers 52. The two heating rollers 52 may be disposed on the mounting frame 10 and respectively installed in the fixing frame 51, and the two heating rollers 52 may be disposed side by side and spaced apart from each other, and may be configured to heat the first separator 100b, the positive electrode sheet 100a, the second separator 100d, and the negative electrode sheet 100c, which are sequentially stacked, so that the composite sheet 100 of an integrated structure is formed by thermal bonding. In some embodiments, the interval between the two heating rollers 52 may be adapted to the sum of the thicknesses of the first separator 100b, the positive electrode sheet 100a, the second separator 100d, and the negative electrode sheet 100c, and thus the first separator 100b, the positive electrode sheet 100a, the second separator 100d, and the negative electrode sheet 100c may be die-cast into an integral structure. The number of the driving mechanisms may be two, and the two driving mechanisms may be correspondingly connected to the two heating rollers 52 to respectively drive the two heating rollers 52 to rotate. The composite sheet 100 is formed by thermal compression, so that a die cutting process can be omitted, and further burrs can be reduced, thereby avoiding the risk of low-voltage fracture of the battery.
Further, in some embodiments, the fixing frame 51 may include a first fixing plate 511 and a second fixing plate 512 disposed at both sides of the first fixing plate 511. One of the second fixing plates 512 may be fixed to the mounting bracket 10 by screws. The two second fixing plates 512 are respectively provided with a shaft hole 5121, and the shaft hole 5121 can be used for the heating roller 52 to be mounted, so that the heating roller 52 can rotate.
Further, in some embodiments, the heating roller 52 may generate heat in a current-carrying state, and further, the first separator 100b, the positive electrode sheet 100a, the second separator 100d, and the negative electrode sheet 100c may be heated and integrated into a single structure, so as to form the composite sheet 100. In some embodiments, the heating roller 52 may include a roller body and an induction coil disposed in the roller body. The roller body may be made of a metal material, and particularly, it may be made of a magnetic metal material. The induction coil can be arranged in the roller body, can be connected with an external power supply through a lead, and can generate a high-frequency alternating magnetic field in a power-on state to enable the roller body to actively generate heat so as to generate heat. Of course, it is understood that in other embodiments, the heating roller 52 is not limited to including induction coils. In some embodiments, the heating roller 52 may further include a protective cover covering the periphery of the roller body, the protective cover may be made of a soft material, and specifically, the protective cover may be a silicone cover, which not only can perform a thermal insulation function, but also can prevent the composite sheet 100 from being damaged. In some embodiments, the outer diameter of the roller body may be 400 mm and 800 mm.
It is understood that in other embodiments, the heating roller 52 may include a roller body and a heat generating body; the roller body can be columnar, and the inner side of the roller body can be of a hollow structure. The heating body can be arranged in the roller body, can generate heat in a power-on state and transmits the heat to the roller body. It is to be understood that, in other embodiments, the heat generating body is not limited to being disposed inside the heating roller 52, and may be disposed on the periphery of the heating roller 52. In some embodiments, the heat generating body may be a heat generating wire or a heat generating sheet.
Further, in some embodiments, the laminating sheet-making apparatus for lithium batteries may further include a first transfer assembly 60; the first transfer assembly 60 can be disposed between the first supply assembly 20 and the thermal pack 50, which can be used to transfer the positive plate 100a to the thermal pack 50. In some embodiments, the first transfer assembly 60 can include a plurality of first transfer rollers 61, and the plurality of first transfer rollers 61 can be staggered between the first feed assembly 20 and the heat sealing assembly 50. In some embodiments, the first material conveying assembly 60 may include five first material conveying rollers 61, two of the five first material conveying rollers 61 are arranged side by side and spaced apart from each other in the direction perpendicular to the feeding direction, and the other three first material conveying rollers 61 are spaced apart from each other in the feeding direction. The positive electrode sheet 100a first passes through two first conveying rollers 61 arranged perpendicular to the feeding direction, then sequentially passes through three first conveying rollers 61 arranged at intervals along the feeding direction, and then enters between the two heating rollers 52. The plurality of first transfer rollers 61 cooperate to transfer the positive electrode sheet 100a of the first supply module 20 to the thermal pack 50.
Further, in some embodiments, the first feeding assembly 60 may further include a first tensioning wheel 62, the first tensioning wheel 62 is located between the first feeding roller 21 and the thermal sealing assembly 50, specifically, it is disposed at one side of two first feeding rollers 61 disposed along a direction perpendicular to the feeding direction and close to the thermal sealing assembly 50, the first tensioning wheel 62 may cooperate with the first feeding rollers 61 to stretch the positive electrode sheet 100a, so as to facilitate the transfer of the positive electrode sheet 100a, and avoid the bending of the positive electrode sheet 100a, thereby facilitating the thermal sealing.
Further, in some embodiments, the laminating sheet-making apparatus for lithium batteries may further include a second transfer assembly 70; the second material conveying assemblies 70 may be two sets, which are disposed corresponding to the two sets of the first material supplying assemblies 20. The second transfer assembly 70 can be disposed between the second supply assembly 30 and the thermal pack 50, and can be used to transfer the membrane on the second supply assembly 30 to the thermal pack 50. In some embodiments, the second transfer assembly 70 can include a plurality of second transfer rollers 71, and the plurality of second transfer rollers 71 can be staggered between the second feed assembly 30 and the hot sealing assembly 50. Specifically, in some embodiments, the number of the second transfer rollers 71 may be four, and of the four second transfer rollers 71, two second transfer rollers 71 are arranged side by side and at intervals in the direction perpendicular to the feeding direction, and the other two second transfer rollers 71 are arranged at intervals in the feeding direction. The diaphragm can pass through the two second material conveying rollers 71 arranged along the direction perpendicular to the feeding direction, then sequentially pass through the two second material conveying rollers 71 arranged along the feeding direction at intervals, and then enter between the two heating rollers 52 and be positioned at two sides of the positive plate 100 a. The second material transfer rollers 71 cooperate with each other to transfer the membrane of the second feeding assembly 30 to the heat sealing assembly 50, and specifically, the two sets of second material transfer assemblies 70 can transfer the first membrane 100b and the second membrane 100d to two sides of the positive electrode sheet 100a respectively.
Further, in some embodiments, the second feeding assembly 70 may further include a second tensioning wheel 72, the second tensioning wheel 72 is located between the second feeding roller 23 and the heat sealing assembly 50, specifically, it is disposed at one side of two second feeding rollers 71 disposed along the direction perpendicular to the feeding direction close to the heat sealing assembly 50, the second tensioning wheel 72 may cooperate with the second feeding rollers 71 to stretch the membrane, thereby facilitating the transfer of the membrane, and may prevent the membrane from being bent, thereby facilitating the heat sealing.
Further, in some embodiments, the laminating sheet-making apparatus for lithium batteries may further include a third feeding assembly 80; the third material transfer member 80 may be disposed at one side of one set of the second material transfer members 70, and it may be disposed between the second material supply member 30 and the heat sealing member 50, which may be used to transfer the negative electrode sheet 100c to the heat sealing member 50. Further, in some embodiments, the third transfer assembly 80 may include a plurality of third transfer rollers 81, and the plurality of third transfer rollers 81 may be disposed between the third feeding assembly 40 and the hot sealing assembly 50 in a staggered manner. The plurality of third feeding rollers 81 may include five third feeding rollers 81, two of the five third feeding rollers 81 are arranged side by side and at intervals in a direction perpendicular to the feeding direction, and the other three third feeding rollers 81 are arranged at intervals in the feeding direction. The negative electrode sheet 100c passes through the two third material conveying rollers 81 arranged perpendicular to the feeding direction, then sequentially passes through the three third material conveying rollers 81 arranged at intervals along the feeding direction, and then enters between the two heating rollers 52. The plurality of third transfer rollers 81 cooperate to transfer the negative electrode tabs 100c of the third feeding assembly 40 to the heat sealing assembly 50.
Further, in some embodiments, the third feeding assembly 80 may further include a third tensioning wheel 82, the third tensioning wheel 82 is located between the third feeding roller 41 and the heat sealing assembly 50, specifically, it is disposed at one side of two third feeding rollers 81 disposed along a direction perpendicular to the feeding direction and close to the heat sealing assembly 50, and the third tensioning wheel 82 may cooperate with the third feeding rollers 81 to stretch the negative electrode sheet 100c, so as to facilitate the transmission of the negative electrode sheet 100c, and avoid the negative electrode sheet 100c from being bent, thereby facilitating the heat sealing.
Further, in some embodiments, the laminating sheet-making apparatus for a lithium battery may further include a tab preparing assembly; the tab preparation assemblies may be disposed on the mounting frame 10, which may be two groups, and are disposed corresponding to the positive electrode tab 100a and the negative electrode tab 100 b. Specifically, one of the two tab preparation assemblies is positioned between the first supply assembly 10 and the hot lamination assembly 50 to provide a positive tab 110 on the empty foil area of the positive plate 100 a; another set is positioned between the third feeding assembly 40 and the thermal sealing assembly 50 to provide negative tabs 120 in the empty foil areas of the negative plate 100 b. Specifically, in some embodiments, the tab preparation assembly may be an ultrasonic welding device or a laser welding device. It is to be understood that in other embodiments, the tab preparation assembly is not limited to being disposed between the first feed assembly 10 and the heat pack 50 or between the third feed assembly 40 and the heat pack 50, and in other embodiments, the tab preparation assembly may be omitted.
Further, in some embodiments, the applying and sheet-making apparatus for lithium battery may further include a cutting assembly, the cutting assembly may be disposed on a side of the hot applying and sheet-making assembly opposite to the first feeding assembly 20, and the cutting assembly may cut the prepared composite sheet 100 to form a composite sheet with a suitable size, so as to meet the requirement of winding each lithium battery cell. It will be appreciated that in other embodiments, the cutting assembly may be omitted.
Fig. 2 to 3 show some preferred embodiments of lithium ion batteries manufactured by using the lamination sheet manufacturing apparatus of lithium ion batteries of the present invention. The lithium ion battery can be widely applied to various fields such as 3C digital, intelligent wearing, electric vehicles, medical treatment, military and the like, and has the advantages of simple structure, convenience in assembly and high assembly efficiency.
Further, in some embodiments, the lithium ion battery may include a battery case, a cell, and an electrolyte. The inner side of the battery shell can form a containing cavity which can be used for containing the battery core; the cell may be disposed in the battery case, which may be used to generate electrical energy. The electrolyte may be filled in the battery case. In some embodiments, the lithium ion cell may be cylindrical in shape, with a diameter of 3-20mm and a thickness of 30-80mm, which may form a 12540, 10540, 16540 cell. Of course, it is understood that in other embodiments, the shape and size of the lithium ion battery are not limited to the above-mentioned shape and size, and the lithium ion battery may also be made into a lithium ion battery for mobile phone digital, a square polymer lithium ion battery, or the like.
Further, in some embodiments, the battery case may have a cylindrical shape. It is to be understood that in other embodiments, the shape of the battery case is not limited to the cylindrical shape, and may be a rectangular parallelepiped shape or other shapes. The inner diameter of the battery shell can be matched with the outer diameter of the winding core. The battery case may be a metal case, and in particular, the case may be a steel case. In some embodiments, the battery case may include an upper cover and a lower cover coupled to the upper cover. The upper cover may include a first cover body and a first opening. The first cover body is of a hollow structure, and an accommodating cavity can be formed on the inner side of the first cover body. The first opening can be arranged at one end of the first cover body, can be communicated with the accommodating cavity and can be used for the electric core assembly to be installed. The lower cover may include a second cover body and a second opening. The second cover body is of a hollow structure, and an accommodating cavity can be formed on the inner side of the second cover body. The size of the second cover body can be slightly larger than that of the first cover body, and the second cover body can be sleeved on the periphery of the first cover body from the first opening of the first cover body along the direction of the first cover body. The second opening can be arranged at one end of the second cover body, can be communicated with the accommodating cavity and can be used for the first cover body to be installed.
Further, as shown in fig. 2 and 3, in some embodiments, the battery cell may include a composite sheet 100, and the composite sheet 100 may be formed by winding on a winding device. The composite sheet 100 may include a first separator 100b, a positive electrode sheet 100a, a second separator 100d, and a negative electrode sheet 100c, which are sequentially stacked; the first separator 100b, the positive electrode sheet 100a, the second separator 100d, and the negative electrode sheet 100c are sequentially stacked and thermally bonded on the bonding sheet manufacturing apparatus of the present invention to form an integrated structure, thereby forming the composite sheet 100. In the hot compress process, the temperature of the hot compress can be controlled to be 45-85 ℃, and the pressure applied to the composite sheet 100 by the heating roller 52 can be 1T-2T in the hot compress process. This electric core is convoluteed through adopting this compound piece 100, can improve the coiling efficiency, avoids first diaphragm, positive plate, second diaphragm, negative pole piece dislocation to appear, and reducible staff contact further avoids the influence of dust and steam simultaneously, realizes furthest's improvement lithium cell's quality. Further, in some embodiments, the width of the composite sheet 100 may be 2 to 350mm, and the width may be less than or equal to the height of the receiving cavity inside the battery case. The composite sheet 100 is formed by thermal compression, so that a die cutting process can be omitted, and further burrs can be reduced, thereby avoiding the risk of low-voltage fracture of the battery.
Further, in some embodiments, the positive electrode sheet 100a may include a positive electrode substrate and a positive electrode material coated on the positive electrode substrate. The anode substrate can be a current collector made of aluminum foil and can be in a strip shape. The anode material can be uniformly coated on the anode substrate. In some embodiments. The positive electrode material may include a positive electrode active material, a conductive agent, and a binder. The weight parts of the positive active material, the conductive agent and the binder are 94-98, 1-3 and 1-3 respectively. The positive electrode active material, the conductive agent, and the binder may be mixed to form the positive electrode material. The positive active material can comprise one or more of lithium cobaltate, ternary lithium nickel cobalt manganese oxide and lithium manganese oxide; the binder may include polyvinylidene fluoride (PVDF); the conductive agent may include nano carbon black. Further, in some embodiments, the width of the positive electrode tab 100a may be 3 to 300mm, and in some embodiments, the width of the positive electrode tab 100a may be optionally 3 to 10 mm.
Further, in some embodiments, the negative electrode sheet 100c may include a negative electrode substrate and a negative electrode material coated on the negative electrode substrate. The negative electrode substrate can be a current collector made of copper foil, and can also be in a strip shape. The negative electrode material can be uniformly coated on the negative electrode substrate. In some embodiments, the negative electrode material may include a negative electrode active material, a conductive agent, and a binder. The weight parts of the negative electrode active material, the conductive agent and the binder are 94-98, 1-3 and 1-3 respectively. The negative electrode active material, the conductive agent, and the binder may be mixed to form a negative electrode material. The negative active material can be one or more of graphite, silicon carbon and lithium titanate; the binder may include one or more of polyvinylidene fluoride (PVDF), Styrene Butadiene Rubber (SBR), sodium carboxymethylcellulose (CMC); the conductive agent may be nano carbon black. Further, in some embodiments, the width of the negative electrode sheet 100c may be 3 to 300mm, and in some embodiments, the width of the negative electrode sheet 100c may be optionally 3 to 10 mm.
Further, in some embodiments, the positive electrode tab 110 and the negative electrode tab 120 may be disposed at two ends of the battery cell. The positive electrode tab 110 may be disposed on the positive electrode sheet 100a by ultrasonic welding or laser welding before the positive electrode sheet 100a is heat-sealed, and is located in the empty foil region of the positive electrode sheet 100 a. The positive tab 110 may be an aluminum metal strip. The negative tab 120 can be disposed on the negative plate 100c by ultrasonic welding or laser welding before the negative plate 100b is thermally bonded, and is located in the empty foil area of the negative plate 100c, and the negative tab 120 can be a copper metal strip. After the positive tab 100a and the negative tab 100b are thermally bonded, the positive tab 110 and the negative tab 120 may be located at two opposite sides, so that the positive tab 110 and the negative tab 120 of the wound battery cell are located at two ends, respectively.
Further, in some embodiments, the first separator 100b may be disposed on one side of the positive electrode tab 100a, on the uppermost layer of the composite sheet 100. One side of the first membrane 100b is coated with a hot melt material. The hot melt material may be coated on the side of the first separator 100b disposed opposite to the positive electrode tab 100 a. The hot melt material may be a hot melt adhesive, which is melted in a heated state to rapidly bond the first separator 100b and the positive electrode tab 100 a. Specifically, in some embodiments, the hot melt material may be polyvinylidene fluoride hexafluoropropylene (PVDF-HFP). It is to be understood that in other embodiments, the hot melt material is not limited to polyvinylidene fluoride hexafluoropropylene (PVDF-HFP).
Further, in some embodiments, the second separator 100b may be disposed between the positive and negative electrode tabs 100a and 100c, both sides of which are coated with a hot-melt material that is melted in a heated state, to rapidly bond the second separator 100b to the positive and negative electrode tabs 100a and 1000c, respectively. Specifically, in some embodiments, the hot melt material may be polyvinylidene fluoride hexafluoropropylene (PVDF-HFP). It is to be understood that in other embodiments, the hot melt material is not limited to polyvinylidene fluoride hexafluoropropylene (PVDF-HFP). In some embodiments, the first membrane 100b and the second membrane 100d can be aligned, thereby facilitating the application of heat sealing and making the prepared composite sheet 100 more aesthetic.
Fig. 4 illustrates some preferred embodiments of a method for making a lithium ion cell composite sheet using the inventive lay-up sheet making apparatus for a lithium battery. The preparation method of the lithium ion battery core composite sheet comprises the following steps:
and S1, manufacturing the positive plate coated with the positive electrode material. In some embodiments, the step of S1 may include the steps of:
s1.1, uniformly mixing a positive electrode active material, a conductive agent and a binder to prepare a positive electrode material; specifically, 94-98 parts by weight of a positive electrode active material, 1-3 parts by weight of a conductive agent and 1-3 parts by weight of a binder are added into a stirring barrel of a stirrer, the stirrer is started to stir until the positive electrode active material, the conductive agent and the binder are uniformly mixed to obtain positive electrode slurry, wherein the positive electrode active material is lithium cobaltate, and in other embodiments, the positive electrode active material is not limited to lithium cobaltate and can be ternary lithium nickel cobalt manganese oxide; or lithium manganate; or the composition of lithium cobaltate, ternary nickel cobalt lithium manganate and lithium manganate. Wherein, the binder can be polyvinylidene fluoride. The conductive agent may be nano carbon black.
S1.2, coating the positive electrode material on a positive electrode substrate; specifically, a current collector of an aluminum foil material with the width of 3-10 mm is selected as a positive electrode substrate, a hollow foil area is reserved on the edge of the positive electrode substrate, which is located at one side close to the positive electrode substrate, and then the positive electrode material is uniformly coated on the positive electrode substrate and located on the outer side of the hollow foil area.
S1.3, pressing the positive electrode substrate coated with the positive electrode material to obtain the positive electrode plate. Specifically, the positive electrode substrate coated with the positive electrode sheet is uniformly pressed by a double-roll machine, so that the positive electrode sheet is obtained.
And S2, manufacturing the negative plate coated with the negative electrode material. In some embodiments, the step of S2 includes the steps of:
s2.1, uniformly mixing the negative active material, the conductive agent and the binder to obtain a negative material; specifically, 94-98 parts by weight of a negative electrode active material, 1-3 parts by weight of a conductive agent and 1-3 parts by weight of a binder are added into a stirring barrel of a stirrer, and the stirrer is started to stir until the materials are uniformly mixed to obtain negative electrode slurry. Wherein the negative active material may be graphite. It is to be understood that in other embodiments, the negative active material may not be limited to graphite, which may be silicon carbon or lithium titanate, or a combination of the three. The binder may be polyvinylidene fluoride, and it is understood that in other embodiments, the binder is not limited to polyvinylidene fluoride, and may be styrene butadiene rubber or sodium carboxymethylcellulose, or a combination thereof; the conductive agent may be nano carbon black.
S2.2, coating the negative electrode material on a negative electrode substrate; specifically, a current collector of a copper foil material with the width of 3-10 mm is selected as a negative electrode substrate, a hollow foil area is reserved at the edge of one side, close to the negative electrode substrate, of the negative electrode substrate, and then the negative electrode material is coated on the negative electrode substrate and located on the outer side of the hollow foil area.
And S2.3, pressing the negative electrode substrate coated with the negative electrode material to obtain the negative electrode sheet. Specifically, the negative electrode substrate coated with the negative electrode sheet is uniformly pressed by a double-roll machine, so that the negative electrode sheet is obtained.
And S3, providing a first diaphragm and a second diaphragm, coating hot melt materials on one side of the first diaphragm, and respectively coating hot melt materials on two sides of the second diaphragm. Wherein, this hot melt material can be the hot melt adhesive, and it can be under the heating state, bonds first diaphragm and positive plate fast, bonds second diaphragm and positive plate and negative pole piece fast to make this first diaphragm, positive plate, second diaphragm, negative pole piece can hot compress to form an organic whole structure. Specifically, in some embodiments, the hot melt material may be a polyvinylidene fluoride-hexafluoropropylene copolymer.
S4, stacking the first diaphragm coated with the hot melt material on one side to one side of the positive plate, arranging the side coated with the hot melt material of the first diaphragm opposite to the positive plate, stacking the second diaphragm coated with the hot melt material on two sides to the other side of the positive plate, stacking the negative plate to one side of the second diaphragm opposite to the positive plate, and forming the first diaphragm, the positive plate, the second diaphragm and the negative plate into an integral structure by hot lamination. In some embodiments, this step S4 may include the steps of:
s4.1, winding the positive plate prepared in the step S1 to form a positive plate roll, then placing the positive plate roll on a first feeding assembly of a laminating plate making device of the lithium battery, and then drawing the positive plate between two heating rollers of the laminating assembly; specifically, the positive plate is placed on a winding machine, the winding machine is started to wind the positive plate to form a positive plate roll, then the positive plate roll is completely sleeved on the periphery of a first feeding roller of the laminating plate manufacturing equipment, the positive plate is pulled out, passes through a first conveying roller positioned at the upper part of two first conveying rollers arranged along the direction perpendicular to the feeding direction, then passes through a first tensioning wheel, is wound to another first conveying roller arranged along the direction perpendicular to the feeding direction, then sequentially passes through three first conveying rollers arranged at intervals along the feeding direction, and finally penetrates between the two heating rollers.
S4.2, winding the first diaphragm coated with the hot-melt material on one side to form a first diaphragm roll, then placing the first diaphragm roll on a second feeding assembly of the laminating sheet-making equipment of the lithium battery, wherein the second feeding assembly is positioned on the outermost side, then drawing the first diaphragm between two heating rollers of the laminating assembly and stacking the first diaphragm to one side of the first diaphragm, and the side of the first diaphragm coated with the hot-melt material is opposite to the positive plate; specifically, a first diaphragm is placed on a winding machine, the winding machine is started to wind the first diaphragm to form a first diaphragm roll, then the first diaphragm roll is completely sleeved on the periphery of a second feeding roller positioned on the outermost side of the laminating sheet making equipment, the first diaphragm is pulled out, one side coated with hot melt materials is arranged opposite to the positive electrode sheet, the first diaphragm passes through a first feeding roller positioned on the upper portion of two second feeding rollers arranged along the direction perpendicular to the feeding direction, then passes through a second tensioning roller, is wound to another second feeding roller arranged along the direction perpendicular to the feeding direction, then sequentially passes through the two second feeding rollers arranged along the feeding direction at intervals, and finally penetrates between the heating rollers from one side of the positive electrode sheet.
S4.3, winding the second membrane coated with the hot-melt material on two sides to form a second membrane roll, placing the second membrane roll on a second feeding assembly of the laminating sheet-making equipment of the lithium battery, wherein the second feeding assembly is positioned in the middle, and drawing the second membrane between two heating rollers of the laminating assembly and stacking the second membrane to the other side of the positive plate; specifically, a second diaphragm is placed on a winding machine, the winding machine is started to wind the second diaphragm to form a second diaphragm roll, then the second diaphragm roll is completely sleeved on the periphery of a second feeding roller positioned in the middle of the laminating sheet manufacturing equipment, the second diaphragm is pulled out, passes through a first feeding roller positioned at the upper part of two second feeding rollers arranged in the direction perpendicular to the feeding direction, then passes through a second tensioning wheel, is wound to the other second feeding roller arranged in the direction perpendicular to the feeding direction, then sequentially passes through the two second feeding rollers arranged at intervals in the feeding direction, and finally penetrates between the heating rollers from the other side of the positive plate.
S4.4, winding the negative plate prepared in the step S2 to form a negative plate roll, then placing the negative plate roll on a third feeding assembly of a laminating plate making device of the lithium battery, and then drawing the negative plate between two heating rollers of the laminating assembly and stacking the negative plate to one side of a second diaphragm opposite to the positive plate; specifically, the negative electrode sheet is placed on a winding machine, the winding machine is started to wind the negative electrode sheet to form a negative electrode sheet roll, then the negative electrode sheet is completely wound on a third feeding roller of the coating sheet manufacturing equipment, the negative electrode sheet is pulled out to pass through the upper third feeding roller of two third feeding rollers arranged along the vertical direction and the feeding direction, then passes through a third tensioning wheel, is wound to the other third feeding roller arranged along the vertical direction, then sequentially passes through three third material conveying rollers arranged along the feeding direction at intervals, and finally penetrates into the space between the heating rollers from one side of the second diaphragm opposite to the positive electrode sheet.
S4.5, starting the applying assembly, driving the first diaphragm, the positive plate, the second diaphragm and the negative plate to move forwards together by rotating the heating roller, heating the first diaphragm, the positive plate, the second diaphragm and the negative plate by the heating roller, applying pressure to the first diaphragm, the positive plate, the second diaphragm and the negative plate to enable the hot-melt material on the first diaphragm and the hot-melt material on the second diaphragm to be melted and enable the first diaphragm, the positive plate, the second diaphragm and the negative plate to be thermally applied to form an integrated composite sheet; specifically, before hot compress, the first diaphragm and the second diaphragm may be aligned, so as to avoid dislocation, and of course, the first diaphragm, the positive plate, the second diaphragm, and the negative plate may also be aligned. Before the hot-bonding assembly is started, the ultrasonic welding device or the laser welding device can be started firstly, the positive tab is welded on the positive plate and located in the empty foil area of the positive plate, the negative tab is welded on the negative plate and located in the empty foil area of the negative plate, and the positive tab and the negative tab can be located on opposite sides. In the hot compressing process, the hot compressing temperature can be controlled to be 45-85 ℃ so as to facilitate the melting of the hot melting material, and the hot compressing time can be controlled by the walking speed, which is 2-30 m/min generally. In the hot-pressing process, the pressure applied to the composite sheet by the heating roller may be 1T to 2T.
The preparation method of the lithium ion battery comprises the following steps of winding the lithium ion battery core composite sheet prepared by the method to form a battery core, placing the battery core into a battery shell, and then injecting liquid and sealing to prepare the lithium ion battery. Specifically, in some embodiments, the lithium ion battery cell composite sheet may be placed on a winding machine and located at a winding needle of the winding machine, the winding machine is started, the winding needle rotates, the composite sheet is wound to form a battery cell, the prepared battery cell is placed in a lower cover, an electrolyte is injected, and then the upper cover and the lower cover are covered and sealed, so as to prepare the lithium ion battery. Thereby can avoid two problems through adopting this compound piece to convolute formation electricity core: 1. the center distance of the pole lug is poor due to the fact that the pole piece is not inserted in place; 2. the problems of winding dislocation, pole piece drift and the like caused by the pole piece deviation problem. Meanwhile, the winding process can be simplified, the winding efficiency is greatly improved, and the labor cost is reduced.
It is to be understood that the foregoing examples, while indicating the preferred embodiments of the invention, are given by way of illustration and description, and are not to be construed as limiting the scope of the invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several changes and modifications can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (10)
1. The preparation method of the lithium ion battery core composite sheet is characterized by comprising the following steps:
s1, manufacturing a positive plate coated with a positive material;
s2, manufacturing a negative plate coated with a negative material;
s3, providing a first diaphragm and a second diaphragm, coating hot melt materials on one side of the first diaphragm, and respectively coating the hot melt materials on two sides of the second diaphragm;
s4, coat the first diaphragm that hot melt material was scribbled to one side and will the one side that hot melt material was scribbled to first diaphragm with positive plate sets up relatively, coats both sides the second diaphragm of hot melt material stacks extremely the opposite side of positive plate, will negative pole piece stack extremely the second diaphragm is carried on the back in one side of positive plate, and will first diaphragm the positive plate the second diaphragm and the negative pole piece forms the compound piece of a body structure through hot compress.
2. The method for preparing a lithium ion battery cell composite sheet according to claim 1, wherein the step S1 comprises the steps of:
s1.1, uniformly mixing a positive electrode active material, a conductive agent and a binder to prepare a positive electrode material;
s1.2, coating the positive electrode material on a positive electrode substrate;
s1.3, pressing the positive electrode substrate coated with the positive electrode material to obtain the positive electrode plate.
3. The preparation method of the lithium ion battery core composite sheet according to claim 2, wherein the weight parts of the positive electrode active material, the conductive agent and the binder are 94-98, 1-3 and 1-3 respectively;
the positive active material comprises one or more of lithium cobaltate, ternary lithium nickel cobalt manganese oxide and lithium manganate;
the binder comprises polyvinylidene fluoride;
the conductive agent includes nano carbon black.
4. The method for preparing a lithium ion battery cell composite sheet according to claim 1, wherein the step S2 comprises the steps of:
s2.1, uniformly mixing the negative active material, the conductive agent and the binder to obtain a negative material;
s2.2, coating the negative electrode material on the negative electrode substrate;
s2.3, pressing the negative electrode substrate coated with the negative electrode material to obtain the negative electrode sheet.
5. The preparation method of the lithium ion battery core composite sheet according to claim 4, wherein the weight parts of the negative electrode active material, the conductive agent and the binder are 94-98, 1-3 and 1-3 respectively;
the negative active material comprises one or more of graphite, silicon carbon and lithium titanate;
the binder comprises one or more of polyvinylidene fluoride, styrene butadiene rubber and sodium carboxymethylcellulose;
the conductive agent includes nano carbon black.
6. The method of manufacturing a lithium ion battery cell composite sheet according to claim 1, wherein in the step S2, the hot melt material includes polyvinylidene fluoride-hexafluoropropylene copolymer.
7. The method for preparing a lithium ion battery cell composite sheet according to claim 1, wherein the step S4 comprises the steps of:
s4.1, winding the positive plate prepared in the step S1 to form a positive plate roll, then placing the positive plate roll on a first feeding assembly of a laminating plate making device of a lithium battery, and then drawing the positive plate between two heating rollers of the laminating assembly;
s4.2, winding a first diaphragm coated with hot melt material on one side to form a first diaphragm roll, then placing the first diaphragm roll on a second feeding assembly of a laminating sheet making device of the lithium battery positioned on the outermost side, then drawing the first diaphragm between two heating rollers of the laminating assembly and stacking the first diaphragm to one side of the first diaphragm, wherein the side coated with the hot melt material on the first diaphragm is opposite to the positive plate;
s4.3, winding a second membrane coated with the hot-melt material on two sides to form a second membrane roll, then placing the second membrane roll on a second feeding assembly of a laminating sheet-making device of the lithium battery, wherein the second feeding assembly is positioned in the middle, and then drawing the second membrane between two heating rollers of the laminating assembly and laminating the second membrane to the other side of the positive plate;
s4.4, winding the negative plate prepared in the step S2 to form a negative plate roll, placing the negative plate roll on a third feeding assembly of a laminating plate manufacturing device of the lithium battery, and then pulling the negative plate to a position between two heating rollers of the laminating assembly and stacking the negative plate to the side, opposite to the positive plate, of the second diaphragm;
s4.5, starting the applying assembly, driving the first diaphragm, the positive plate, the second diaphragm and the negative plate to move forwards together through the rotation of the heating roller, heating the heating roller and applying pressure to the first diaphragm, the positive plate, the second diaphragm and the negative plate to enable the hot-melt material on the first diaphragm and the hot-melt material on the second diaphragm to be melted and enable the first diaphragm, the positive plate, the second diaphragm and the negative plate to be thermally applied to form an integrated composite sheet;
wherein the first membrane and the second membrane are aligned prior to the heat sealing.
8. The preparation method of the lithium ion battery cell composite sheet according to claim 7, wherein in the step S4, the heat bonding temperature is 45-85 ℃;
and/or the pressure applied to the composite sheet during hot compression is 1T-2T;
and/or a protective sleeve is sleeved on the heating roller of the applying assembly.
9. The method for preparing a lithium ion battery cell composite sheet according to claim 7, wherein in the step S4.5, before starting the application assembly, a positive tab is arranged on the positive electrode sheet; and a negative electrode lug is arranged on the negative electrode sheet.
10. A method for preparing a lithium ion battery, which is characterized by comprising the following steps of winding the composite sheet prepared by the method for preparing the lithium ion battery core composite sheet according to any one of claims 1 to 9 to form a battery core, putting the battery core into a battery shell, and then carrying out liquid injection and sealing to prepare the lithium ion battery.
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| CN202010166394.3A CN111430639A (en) | 2020-03-11 | 2020-03-11 | Preparation method of lithium ion cell composite sheet and preparation method of lithium ion battery |
| US16/914,454 US11552326B2 (en) | 2020-02-25 | 2020-06-28 | Button lithium ion battery, preparation method thereof and preparation method of lithium ion cell composite flat sheet |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113363595A (en) * | 2021-06-02 | 2021-09-07 | 深圳吉阳智能科技有限公司 | Power lithium ion battery and preparation method thereof |
| FR3125641A1 (en) * | 2022-11-07 | 2023-01-27 | Verkor | Cell for electrical energy storage device and method of manufacturing such a cell |
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Inventor after: Bin Jianjun Inventor after: Zhao Xiaojun Inventor after: Long Xiang Inventor after: Xie Lin Inventor after: Wang Jun Inventor after: Ye Kai Inventor after: Wang Xiaolin Inventor after: Zhang Yin Inventor before: Bin Jianjun Inventor before: Yuan Huijun Inventor before: Long Xiang Inventor before: Zhang Guomin Inventor before: Dang Haitao Inventor before: Jian Aijun Inventor before: Wang Xiaolin |
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Application publication date: 20200717 |