CN114843452A - Dry-process sheet making equipment - Google Patents
Dry-process sheet making equipment Download PDFInfo
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- CN114843452A CN114843452A CN202210583555.8A CN202210583555A CN114843452A CN 114843452 A CN114843452 A CN 114843452A CN 202210583555 A CN202210583555 A CN 202210583555A CN 114843452 A CN114843452 A CN 114843452A
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- pole piece
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- roller
- roller group
- press roller
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- 238000001035 drying Methods 0.000 title abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 94
- 239000002994 raw material Substances 0.000 claims abstract description 52
- 239000011888 foil Substances 0.000 claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 16
- 239000002356 single layer Substances 0.000 claims abstract description 13
- 238000005096 rolling process Methods 0.000 claims description 43
- 238000003825 pressing Methods 0.000 claims description 42
- 230000006835 compression Effects 0.000 claims description 35
- 238000007906 compression Methods 0.000 claims description 35
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 27
- 239000011149 active material Substances 0.000 claims description 19
- 239000006258 conductive agent Substances 0.000 claims description 19
- 239000011230 binding agent Substances 0.000 claims description 18
- 238000004804 winding Methods 0.000 claims description 17
- 239000010410 layer Substances 0.000 claims description 16
- 239000000203 mixture Substances 0.000 claims description 13
- 230000000994 depressogenic effect Effects 0.000 claims description 11
- 239000000843 powder Substances 0.000 claims description 11
- 239000012528 membrane Substances 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 7
- 239000011889 copper foil Substances 0.000 claims description 7
- -1 transition metal nitride Chemical class 0.000 claims description 7
- 238000005303 weighing Methods 0.000 claims description 7
- 239000002033 PVDF binder Substances 0.000 claims description 6
- 239000004698 Polyethylene Substances 0.000 claims description 6
- 229920002125 Sokalan® Polymers 0.000 claims description 6
- 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 6
- 239000002041 carbon nanotube Substances 0.000 claims description 6
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 6
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 6
- 229910021389 graphene Inorganic materials 0.000 claims description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 6
- 239000004584 polyacrylic acid Substances 0.000 claims description 6
- 229920002239 polyacrylonitrile Polymers 0.000 claims description 6
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 6
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 6
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 6
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 4
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 claims description 3
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 3
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 3
- 239000006230 acetylene black Substances 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 230000000712 assembly Effects 0.000 claims description 3
- 238000000429 assembly Methods 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 239000004917 carbon fiber Substances 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 239000007770 graphite material Substances 0.000 claims description 3
- 239000003273 ketjen black Substances 0.000 claims description 3
- 229910052744 lithium Inorganic materials 0.000 claims description 3
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims description 3
- 239000011574 phosphorus Substances 0.000 claims description 3
- 229920001485 poly(butyl acrylate) polymer Polymers 0.000 claims description 3
- 229920000447 polyanionic polymer Polymers 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 3
- 235000010413 sodium alginate Nutrition 0.000 claims description 3
- 239000000661 sodium alginate Substances 0.000 claims description 3
- 229940005550 sodium alginate Drugs 0.000 claims description 3
- 229910052723 transition metal Inorganic materials 0.000 claims description 3
- 229910000314 transition metal oxide Inorganic materials 0.000 claims description 3
- 239000010406 cathode material Substances 0.000 claims 5
- 239000010405 anode material Substances 0.000 claims 3
- 239000002904 solvent Substances 0.000 abstract description 12
- 230000008569 process Effects 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 7
- 238000005265 energy consumption Methods 0.000 abstract description 7
- 230000002411 adverse Effects 0.000 abstract description 6
- 238000005259 measurement Methods 0.000 description 16
- 239000007773 negative electrode material Substances 0.000 description 10
- 239000011812 mixed powder Substances 0.000 description 6
- 239000007774 positive electrode material Substances 0.000 description 6
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 239000013543 active substance Substances 0.000 description 2
- 239000005030 aluminium foil Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 238000004537 pulping Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000007767 bonding agent Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
-
- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention provides dry-process sheet making equipment which comprises a foil material, a first feeding bin, a first film unreeling, a first press roller group, a first film reeling and a second press roller group, wherein the raw material of a first pole piece enters the first press roller group from the first feeding bin, the first film material is unreeled from the first film and output to the first press roller group, the raw material of the first pole piece is rolled and formed by the first press roller group to form a first pole piece and is attached to the first film material, the first film reeling is positioned at the downstream of the first press roller group, the first film material is reeled and recycled by the first film, the first pole piece and the foil material which are peeled off from the first film material are simultaneously conveyed to the second press roller group, and the first pole piece and the foil material are rolled by the second press roller group to form a single-layer battery pole piece. The method has the advantages of reducing the cost of tabletting equipment, simplifying the process, reducing the material loss and the energy consumption, avoiding the use of solvents and avoiding the adverse effect of solvent residues on the performance of the battery.
Description
Technical Field
The invention relates to the field of lithium ion battery sheet making equipment, in particular to dry-process sheet making equipment.
Background
At present, the lithium ion battery pole piece is mainly manufactured by the working procedures of feeding, pulping, coating, drying, rolling and the like, and has the disadvantages of complex process, high equipment and material cost and high energy consumption.
The traditional tabletting equipment comprises a plurality of procedures of feeding, pulping, coating, drying, rolling and the like, and has the disadvantages of complex process, high equipment cost, large material loss and large energy consumption.
Positive electrode solvent (NMP) has a safety risk, and solvent residues are difficult to handle, affecting battery performance, increasing polarization, increasing internal resistance.
Disclosure of Invention
The invention aims to provide dry-process tabletting equipment, which reduces the cost of the tabletting equipment, simplifies the process, reduces the material loss and the energy consumption, does not use a solvent and avoids the adverse effect of solvent residue on the performance of a battery.
In order to achieve the above purpose, the invention provides the following technical scheme:
a dry-process sheet making device comprises a foil, a first feeding bin, a first film unreeling, a first press roller group, a first film reeling and a second press roller group, wherein raw materials of a first pole piece enter the first press roller group from the first feeding bin, the first film material is unreeled by the first film and output to the first press roller group, the raw materials of the first pole piece are rolled by the first press roller group to form a first pole piece and are attached to the first film material, the first film reeling is located at the downstream of the first press roller group, the first film material is recycled by the first film reeling, the first pole piece and the foil stripped from the first film material are simultaneously conveyed to the second press roller group, and the first pole piece and the foil are rolled by the second press roller group to form a single-layer battery pole piece.
Further, in the dry film making equipment, a first roller is arranged between the film unwinding and the first press roller set, the first film material passes through the first roller and then enters the first press roller set, a second roller is arranged between the first press roller set and the film winding, the first pole piece and the first film material together pass through the second roller, a third roller is arranged between the film winding and the second press roller set, and the first pole piece passes through the third roller and then enters the second press roller set; preferably, the rolling performed by the first roll set is normal temperature rolling, and preferably, the rolling performed by the second roll set is heating rolling or normal temperature rolling.
Further, in foretell dry process film-making equipment, still include feeding subassembly, feeding subassembly includes a plurality of raw materials buckets, inhales the material rifle, measures the delivery tank, stirring rake and feeding screw, wherein, deposit the raw materials in the raw materials bucket, every raw materials bucket is furnished with one inhale the material rifle, inhale the material rifle with the raw materials follow a plurality of raw materials buckets in proper order and add to in the measurement delivery tank, the measurement delivery tank is connected with weighing module, weighing module is right the measurement delivery tank is weighed in adding weight, be provided with in the measurement delivery tank the stirring rake, the stirring rake is driven by servo motor and is right the raw materials in the measurement delivery tank are dry-blended, the export of measurement delivery tank is provided with feeding screw, the raw materials after the mixture feeding screw at the uniform velocity send into in the feeding bin, preferably, the raw materials bucket is provided with three, three material suction guns are arranged; preferably, the feed assembly further comprises a vacuum generator in communication with the metering canister, the vacuum generator providing negative pressure to the metering canister.
Further, in foretell dry process film-making equipment, first compression roller set includes two first compression rollers, two first compression roller is gravure roller, the annular depressed area has on the first compression roller, the annular depressed area is located the middle section of first compression roller.
Further, in the above dry tableting apparatus, one of the first pressing rollers is fixed in position, the other of the first pressing rollers is movable in the horizontal direction, and the movement of the other of the first pressing rollers is achieved by driving a hydraulic cylinder by a servo motor; the thickness of the single-layer battery pole piece is between 50 and 120 mu m.
Further, in the dry sheet making apparatus described above, the second pressing roller set includes two second pressing rollers, one of the second pressing rollers is fixed in position, the other of the second pressing rollers is movable in the vertical direction, and the movement of the other of the second pressing rollers is realized by driving a hydraulic cylinder by a servo motor.
Further, in the dry process sheet making equipment, a second feeding bin, a second film unreeling, a third press roller group and a second film reeling are further included, wherein the raw material of a second pole piece enters the third press roller group from the second feeding bin, a second film material is unreeled from the second film and is output to the third press roller group, the raw material of the second pole piece is rolled by the third press roller group to form a second pole piece and is attached to the second film material, the second film reeling is located at the downstream of the third press roller group, the first film material is recycled by the second film reeling, the second pole piece peeled from the second film material and the foil material are simultaneously conveyed to the second press roller group, and the first pole piece, the second pole piece and the foil material are rolled by the second press roller group to form a double-layer battery pole piece; preferably, the raw material of the second pole piece is fed into the second feeding bin by a group of the feeding assemblies; the thickness of the double-layer battery pole piece is between 90 and 250 mu m.
Further, in the dry film making equipment, a fourth passing roller is arranged between the second film unwinding roll and the third pressing roller set, the second film material passes through the fourth passing roller and then enters the third pressing roller set, a fifth passing roller is arranged between the third pressing roller set and the second film winding roll, the second pole piece and the second film material together pass through the fifth passing roller, a sixth passing roller is arranged between the second film winding roll and the second pressing roller set, and the second pole piece passes through the sixth passing roller and then enters the second pressing roller set; preferably, the third compression roller set comprises two third compression rollers, two of which are gravure rollers, and the third compression roller is provided with an annular depressed area, wherein the annular depressed area is located in the middle section of the third compression roller, and preferably, the rolling performed by the third compression roller set is normal-temperature rolling.
Further, in foretell dry process film-making equipment, the material of first membrane material is PET or PE, the material of second membrane material is PET or PE, the width of first membrane material does 130% -150% of single-layer battery pole piece, the width of second membrane material does 130% -150% of double-layer battery pole piece, or, the foil is anodal aluminium foil, the thickness of anodal aluminium foil is 10 mu m ~ 13 mu m, the foil is the negative pole copper foil, the thickness of negative pole copper foil is 4.5 mu m ~ 8 mu m, the low reaches of second compression roller set are provided with the rolling, the rolling is used for with single-layer battery pole piece or double-layer battery pole piece coil stock.
Further, in the above dry tabletting apparatus, the raw material is a powder material, and the raw material includes an active material, a conductive agent and a binder, wherein the active material is one or a mixture of more of a transition metal oxide type positive electrode material, a polymer positive electrode material, a polyanion type positive electrode material or a carbon negative electrode material, a tin-based negative electrode material, a lithium-containing transition metal nitride negative electrode material, an alloy type negative electrode material and a nano-scale negative electrode material; the conductive agent is one or a mixture of acetylene black, carbon fibers, carbon nanotubes, Ketjen black, conductive graphite, graphene and activated carbon; the binder is one or a mixture of more of sodium carboxymethylcellulose, styrene butadiene rubber, polyvinylidene fluoride, polytetrafluoroethylene, polyacrylic acid, polyacrylonitrile, sodium alginate, polyvinyl alcohol, polybutyl acrylate and polyethylene oxide; preferably, the active material is a lithium iron phosphate material, the conductive agent is a carbon nanotube and conductive carbon black, the binder is polyvinylidene fluoride and polyacrylic acid, and the active material, the conductive agent and the binder are 96: 1.5: 2.5 by weight; preferably, the active material is a phosphorus graphite material, the conductive agent is graphene and conductive carbon black, the binder is sodium carboxymethylcellulose, styrene butadiene rubber and polyacrylonitrile, and the weight ratio of the active material to the conductive agent to the binder is 96.5: 2: 1.5.
The analysis shows that the dry tabletting equipment disclosed by the invention reduces the cost of the tabletting equipment, simplifies the process, reduces the material loss, reduces the energy consumption, does not use a solvent and avoids the adverse effect of solvent residue on the battery performance by improving the tabletting equipment and method.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. Wherein:
fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a double-layer battery pole piece according to an embodiment of the invention.
Fig. 3 is a schematic view of the structure of the first roll set or the third roll set in an embodiment of the invention.
FIG. 4 is a schematic sectional front view of the structure of a second press roll in one embodiment of the invention.
FIG. 5 is a schematic left sectional view of the structure of a second press roll in an embodiment of the invention.
Description of reference numerals: 1. a suction gun; 2. a metering delivery tank; 3. a stirring paddle; 4. a feed screw; 5. a weighing module; 6. unwinding a first film; 7. a first charging bin; 8. a first press roll; 9. a first press roll; 10. rolling a first film; 11. a second press roll, 12, a second press roll; 13. a foil material; 14. rolling; 15. a first pole piece; 16. a second pole piece; 17. a vacuum generator; 18. a hydraulic cylinder; 19. a servo motor; 20. a servo motor; 21. a hydraulic cylinder; 22. a hydraulic oil flow passage.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. The various examples are provided by way of explanation of the invention, and not limitation of the invention. In fact, it will be apparent to those skilled in the art that modifications and variations can be made in the present invention without departing from the scope or spirit thereof. For instance, features illustrated or described as part of one embodiment, can be used with another embodiment to yield a still further embodiment. It is therefore intended that the present invention encompass such modifications and variations as fall within the scope of the appended claims and equivalents thereof.
In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are for convenience of description of the present invention only and do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. The terms "connected," "connected," and "disposed" as used herein are intended to be broadly construed, and may include, for example, fixed and removable connections; can be directly connected or indirectly connected through intermediate components; the connection may be a wired electrical connection, a wireless electrical connection, or a wireless communication signal connection, and a person skilled in the art can understand the specific meaning of the above terms according to specific situations.
One or more examples of the invention are illustrated in the accompanying drawings. The detailed description uses numerical and letter designations to refer to features in the drawings. Like or similar designations in the drawings and description have been used to refer to like or similar parts of the invention. As used herein, the terms "first," "second," and "third," etc. may be used interchangeably to distinguish one component from another, and are not intended to denote the position or importance of the individual components.
As shown in fig. 1 to 5, according to an embodiment of the present invention, a dry process sheet-making apparatus is provided, which includes a foil 13, a first feeding bin 7, a first film unwinding bin 6, a first compression roller set, a first film winding bin 10, and a second compression roller set, wherein a raw material of a first pole piece 15 enters the first compression roller set from the first feeding bin 7, the first film is output to the first compression roller set from the first film unwinding bin 6, the raw material of the first pole piece 15 is formed by rolling and molding the first pole piece 15 by the first compression roller set and is attached to the first film, the first film winding bin 10 is located at a downstream of the first compression roller set, the first film winding bin 10 recovers the first film, the first pole piece 15 peeled from the first film and the foil 13 are simultaneously conveyed to the second compression roller set, and the first pole piece 15 and the foil 13 are rolled by the second compression roller set to form a single-layer battery pole piece.
The inventor researches and discovers that when the battery pole piece is prepared by a dry method, the raw material to be pressed and a membrane material are pressed together to form the pole piece, and then the pole piece separated from the membrane material is pressed together with a foil material, so that the cost of the piece-making equipment is reduced, the process is simplified, the material loss is reduced, the energy consumption is reduced, no solvent is used, and the adverse effect of solvent residue on the battery performance is avoided.
The first rolling (between the first press roll 8 and the first press roll 9) performed by the first press roll group can be performed only by normal temperature rolling but not by heating rolling, and the film material is melted and deformed by heating.
The second rolling (between the second press roller 11 and the second press roller 12) performed by the second press roller set may adopt two modes of heating rolling and room-temperature rolling. Due to the structural design of the invention, the preparation requirements of the pole piece can be met by rolling at normal temperature.
The first rolling performed by the first pressing roll group and the second rolling performed by the second pressing roll group both adopt normal-temperature rolling, so that the cost can be greatly reduced.
If heating rolling is selected, as shown in fig. 4 and 5, the second pressing roller 11 and the second pressing roller 12 are pressing rollers having hydraulic oil flow passages 22 inside, and heat conducting oil is introduced to perform heating rolling. The hot pressing has the following advantages: moisture in the pole piece is removed, and the internal stress of the pole piece is reduced, so that the adverse effect of the release of the internal stress of the pole piece is reduced during slitting or die cutting; the material rebound of the pole piece after rolling is reduced; the deformation resistance of the battery pole piece is reduced, and the liquid absorption amount of active substances is favorably improved; because the pole piece is in a molten state in the heating process, the hot rolling can increase the adhesive force between the active substance and the fluid, reduce the occurrence of the powder falling condition of the battery in the charging and discharging circulation process and prolong the cycle life of the battery.
The dry-process sheet making equipment is suitable for preparing the positive plate and the negative plate, the raw material powder and the foil 13 are replaced, and the switching can be completed by adjusting the proper rolling thickness.
Further, a first roller is arranged between the film unreeling device and the first press roller group, a first film material enters the first press roller group after passing through the first roller, a second roller is arranged between the first press roller group and the film reeling device, the first pole piece 15 and the first film material pass through the second roller together, a third roller is arranged between the film reeling device and the second press roller group, and the first pole piece 15 enters the second press roller group after passing through the third roller. The first roller, the second roller and the third roller are driven rollers, and two ends of the first roller, the second roller and the third roller are fixed by bearings. The first, second and third rollers function to assist in the movement of the substrate (first film and first pole piece 15), the direction of the substrate at a specific location.
Further, still include the feeding subassembly, the feeding subassembly includes a plurality of former feed buckets, inhale material rifle 1, measurement sending tank 2, stirring rake 3 and feeding screw 4, wherein, deposit the raw materials in the former feed bucket, every former feed bucket is furnished with one and inhales material rifle 1, inhale material rifle 1 and add the raw materials to measurement sending tank 2 from a plurality of former feed buckets in proper order, measurement sending tank 2 is connected with weighing module 5, weighing module 5 adds the weight measurement to measurement sending tank 2, be provided with stirring rake 3 in the measurement sending tank 2, stirring rake 3 is dry-blended by the servo motor drive to the raw materials in the measurement sending tank 2, the export of measurement sending tank 2 is provided with feeding screw 4, raw materials feeding screw 4 after the mixture is at the uniform velocity and is sent into to throwing the feed bin. Preferably, three raw material barrels are arranged, three material suction guns 1 are arranged, and the three raw material barrels are used for respectively containing the active materials, the conductive agents and the bonding agents; preferably, the feeding assembly further comprises a vacuum generator 17, the vacuum generator 17 being in communication with the dosing and delivery tank 2, the vacuum generator 17 providing a negative pressure to the dosing and delivery tank 2.
Form the mixed powder through inhaling material rifle 1 and add the raw materials powder in proper order to measurement sending tank 2 from former storage bucket, weighing module 5 is through the mode of the measurement that increases weight, guarantees that every raw materials can be according to the accurate reinforced of prescription. After the raw material powder is measured, the servo motor drives the stirring paddle 3 to dry mix the powder (20-60min, determined according to the process) so that the raw material powder materials are uniformly mixed, and the mixed raw material powder materials are uniformly fed into the first feeding bin 7 through the feeding screw rod 4, so that foreign matters are prevented from entering the mixed powder to influence the safety of the battery, and the powder dust is prevented from influencing the feeding precision; and simultaneously, the feeding speed of the feeding screw rod 4 is controlled to control the surface density of the pole piece.
Preferably, the first pressing roller set comprises two first pressing rollers, the two first pressing rollers are both gravure rollers, and each first pressing roller is provided with an annular concave area which is located in the middle section of the corresponding first pressing roller. The mixed powder enters between a first press roll 8 and a first press roll 9 through a first feeding bin 7. As shown in fig. 3, the first compression roller 8 and the first compression roller 9 are gravure rollers, the width of the depressed area is the width of the produced pole piece, the annular central depressed area is the pole piece forming area, the mixed powder forming is facilitated, the first compression roller 8 and the first compression roller 9 use quick release structures, the switching is facilitated, and the battery pole pieces with different widths are produced correspondingly.
Preferably, the position of one of the first pressing rollers 8 is fixed, the other first pressing roller 9 can move in the horizontal direction, and the movement of the other first pressing roller 9 is realized by driving a hydraulic cylinder 18 through a servo motor 19; the thickness of the single-layer battery pole piece is between 50 and 120 mu m.
Preferably, the second press roll set comprises two second press rolls, wherein one second press roll 11 is fixed in position, the other second press roll 12 can move in the vertical direction, and the movement of the other second press roll 12 is realized by driving a hydraulic cylinder 21 through a servo motor 19.
Preferably, the device further comprises a second feeding bin, a second film unreeling device, a third press roller group and a second film reeling device, wherein the raw material of the second pole piece 16 enters the third press roller group from the second feeding bin, the second film unreels from the second film and is output to the third press roller group, the raw material of the second pole piece 16 is rolled by the third press roller group to form the second pole piece 16 and is attached to the second film, the second film reeling device is positioned at the downstream of the third press roller group, the second film reeling device recovers the first film, the second pole piece 16 stripped from the second film and the foil 13 are simultaneously conveyed to the second press roller group, and the first pole piece 15, the second pole piece 16 and the foil 13 are rolled by the second press roller group to form a double-layer battery pole piece; preferably, the feedstock for the second pole piece 16 is fed into a second batch bin by a set of feed assemblies; the thickness of the double-layer battery pole piece is between 90 and 250 mu m.
Preferably, a fourth roller is arranged between the second film unwinding roll and the third roller group, the second film material enters the third roller group after passing through the fourth roller, a fifth roller is arranged between the third roller group and the second film winding roll, the second pole piece 16 and the second film material pass through the fifth roller together, a sixth roller is arranged between the second film winding roll and the second roller group, and the second pole piece 16 enters the second roller group after passing through the sixth roller. The fourth roller, the fifth roller and the sixth roller are driven rollers, and two ends of the driven rollers are fixed by bearings. The fourth, fifth and sixth rollers function to assist the movement of the substrate (second film and second pole piece 16), and to guide the direction of the substrate at a specific position. The third compression roller group comprises two third compression rollers, the two third compression rollers are all gravure rollers, an annular depressed area is arranged on the third compression roller, and the annular depressed area is located in the middle section of the third compression roller. Preferably, the rolling performed by the third roll set is normal-temperature rolling. The first rolling performed by the third roller group can only adopt normal-temperature rolling but not heating rolling, and the film material is molten and deformed when being heated.
Preferably, the first film material is made of PET or PE, the second film material is made of PET or PE, the width of the first film material is 130% -150% of that of the single-layer battery pole piece, the width of the second film material is 130% -150% of that of the double-layer battery pole piece, and the film material is 30% -50% wider than the pole piece so as to avoid the situations that the width of the film area exceeds that of the film material edge tape during rolling, and material falling, falling and the like occur. If the membrane material exceeds the pole piece by too much, the material is wasted, and the material exceeding 30-50 percent is reasonable. The foil 13 is a positive aluminum foil, the thickness of the positive aluminum foil is 10-13 microns, the foil 13 is a negative copper foil, the thickness of the negative copper foil is 4.5-8 microns, and the winding is arranged at the downstream of the second press roller group and used for winding single-layer battery pole pieces or double-layer battery pole pieces.
The position of the first press roller 8 is fixed, the first press roller 9 drives the hydraulic cylinder 18 to move horizontally through the servo motor 19, the thickness (between 50 and 120 micrometers) of the first pole piece 15 is controlled, the mixed powder is rolled and formed and attached to the first film material, the mixed powder is taken to the first film rolling 10 along with the first film material, the first film material begins to be peeled off, and the first pole piece 15 continues to advance through the third roller. The first pole piece 15, a foil 13 (a positive aluminum foil with the thickness of 10-13 mu m; a negative copper foil with the thickness of 4.5-8 mu m) and a second pole piece 16 are together fed into a space between a second pressing roller 11 and a second pressing roller 12 to be rolled (the preparation method of the second pole piece 16 is the same as that of the first pole piece 15), a servo motor 20 drives a hydraulic cylinder 21 to push the second pressing roller 12 to move up and down, the gap (90-250 mu m) between the second pressing roller 12 and the second pressing roller 11 is changed to control the thickness of the synthesized double-layer battery pole piece, the double-layer battery pole piece reaches the preset thickness after being rolled, and is conveyed to a winding roller 14 to complete material rolling, and the preparation of the double-layer battery pole piece is completed.
Preferably, the raw materials are powder materials, and the raw materials comprise an active material, a conductive agent and a binder. The active material is one or a mixture of more of a transition metal oxide type positive electrode material, a polymer positive electrode material, a polyanion type positive electrode material or a carbon negative electrode material, a tin-based negative electrode material, a lithium-containing transition metal nitride negative electrode material, an alloy type negative electrode material and a nano-scale negative electrode material; the conductive agent is one or a mixture of acetylene black, carbon fibers, carbon nanotubes, Ketjen black, conductive graphite, graphene and activated carbon; the binder is one or a mixture of more of sodium carboxymethylcellulose, styrene butadiene rubber, polyvinylidene fluoride, polytetrafluoroethylene, polyacrylic acid, polyacrylonitrile, sodium alginate, polyvinyl alcohol, polybutyl acrylate and polyethylene oxide. When the positive pole piece is prepared, the active material is a lithium iron phosphate material, the conductive agent is a carbon nano tube and conductive carbon black, and the binder is polyvinylidene fluoride and polyacrylic acid, wherein the active material, the conductive agent and the binder are 96: 1.5: 2.5 by weight. When the negative pole piece is prepared, the active material is a phosphorus graphite material, the conductive agent is graphene and conductive carbon black, and the binder is sodium carboxymethylcellulose, styrene butadiene rubber and polyacrylonitrile, wherein the active material, the conductive agent and the binder are 96.5: 2: 1.5 in parts by weight.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects: by improving the tabletting equipment and method, the cost of tabletting equipment is reduced, the process is simplified, the material loss is reduced, the energy consumption is reduced, the solvent is not used, and the adverse effect of solvent residue on the battery performance is avoided.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A dry-method sheet-making device is characterized by comprising a foil, a first feeding bin, a first film unreeling, a first press roller group, a first film reeling and a second press roller group,
the raw material of the first pole piece enters the first compression roller group from the first feeding bin,
the first film material is unreeled from the first film and output to the first press roller group,
the raw material of the first pole piece is rolled and molded by the first press roll set to form a first pole piece and is attached to the first membrane material,
the first film roll is positioned at the downstream of the first press roller group and used for recovering the first film material,
the first pole piece and the foil stripped from the first film are simultaneously conveyed to the second press roller group,
and the first pole piece and the foil are rolled by the second pressing roller set to form a single-layer battery pole piece.
2. The dry tableting equipment according to claim 1, wherein a first passing roller is provided between the film unwinding roll and the first press roller group, the first film material passes through the first passing roller and then enters the first press roller group,
a second roller is arranged between the first press roller group and the film roll, the first pole piece and the first film material pass through the second roller together,
a third roller is arranged between the film winding and the second press roller group, and the first pole piece enters the second press roller group after passing through the third roller;
preferably, the rolling performed by the first roll set is normal-temperature rolling,
preferably, the rolling performed by the second roll set is heating rolling or normal temperature rolling.
3. The dry tableting equipment of claim 1, further comprising a feed assembly comprising a number of stock barrels, suction lances, a metering delivery tank, paddles, and a feed screw, wherein,
raw materials are stored in the raw material barrels, each raw material barrel is provided with one material suction gun,
the material suction gun sequentially adds raw materials into the metering and sending tank from a plurality of raw material barrels,
the metering and sending tank is connected with a weighing module which is used for weighting and metering the weight of the metering and sending tank,
the metering and sending tank is internally provided with the stirring paddle which is driven by a servo motor to dry-mix the raw materials in the metering and sending tank,
the outlet of the metering and sending tank is provided with the feeding screw, the mixed raw materials are fed into the feeding bin by the feeding screw at a constant speed,
preferably, the number of the raw material barrels is three, and the number of the material suction guns is three;
preferably, the feed assembly further comprises a vacuum generator in communication with the metering canister, the vacuum generator providing negative pressure to the metering canister.
4. The dry tableting apparatus according to claim 1, wherein the first compression roller set comprises two first compression rollers, both of which are gravure rollers, and the first compression roller has an annular depressed area located at a middle section of the first compression roller.
5. Dry tableting equipment according to claim 4,
one of the first press rollers is fixed in position, the other first press roller can move in the horizontal direction, and the movement of the other first press roller is realized by driving a hydraulic cylinder by a servo motor;
the thickness of the single-layer battery pole piece is between 50 and 120 mu m.
6. Dry tableting equipment according to claim 1,
the second pressing roller set comprises two second pressing rollers, wherein one of the second pressing rollers is fixed in position, the other second pressing roller can move in the vertical direction, and the other second pressing roller can move by driving a hydraulic cylinder through a servo motor.
7. The dry tableting apparatus according to claim 3, further comprising a second feeding bin, a second film unwinding, a third compression roller set, and a second film winding, wherein,
the raw material of the second pole piece enters the third press roller group from the second feeding bin,
the second film material is unreeled by the second film and output to the third press roller group,
the raw material of the second pole piece is rolled and molded by the third press roll group to form a second pole piece and is attached to the second film material,
the second film roll is positioned at the downstream of the third press roller group and used for recovering the first film material,
the second pole piece and the foil stripped from the second membrane material are simultaneously conveyed to the second press roller group,
the first pole piece, the second pole piece and the foil are rolled by the second pressing roller set to form a double-layer battery pole piece;
preferably, the raw material of the second pole piece is fed into the second feeding bin by a group of the feeding assemblies;
the thickness of the double-layer battery pole piece is between 90 and 250 mu m.
8. The dry tableting equipment according to claim 7, wherein a fourth roller is provided between the second film unwinding roll and the third roller set, the second film material passes through the fourth roller and then enters the third roller set,
a fifth roller is arranged between the third press roller group and the second film roll, the second pole piece and the second film material pass through the fifth roller together,
a sixth roller is arranged between the second film winding and the second press roller group, and the second pole piece enters the second press roller group after passing through the sixth roller;
preferably, the third pressing roller group comprises two third pressing rollers, both of which are gravure rollers, the third pressing rollers are provided with annular depressed areas, the annular depressed areas are positioned at the middle sections of the third pressing rollers,
preferably, the rolling performed by the third roll set is normal-temperature rolling.
9. Dry tableting equipment according to claim 7,
the first film material is made of PET or PE,
the second film material is made of PET or PE,
the width of the first membrane material is 130-150% of the single-layer battery pole piece,
the width of the second film material is 130-150% of the double-layer battery pole piece,
the foil is a positive aluminum foil, the thickness of the positive aluminum foil is 10-13 mu m, or,
the foil is a negative copper foil, the thickness of the negative copper foil is 4.5-8 μm,
and a winding is arranged at the downstream of the second compression roller group and used for winding the single-layer battery pole piece or the double-layer battery pole piece.
10. The dry tableting apparatus according to claim 1, wherein the raw material is a powder material, the raw material includes an active material, a conductive agent and a binder, wherein,
the active material is one or a mixture of more of a transition metal oxide type anode material, a polymer anode material, a polyanion type anode material or a carbon cathode material, a tin-based cathode material, a lithium-containing transition metal nitride cathode material, an alloy type cathode material and a nano-scale cathode material;
the conductive agent is one or a mixture of acetylene black, carbon fibers, carbon nanotubes, Ketjen black, conductive graphite, graphene and activated carbon;
the binder is one or a mixture of more of sodium carboxymethylcellulose, styrene butadiene rubber, polyvinylidene fluoride, polytetrafluoroethylene, polyacrylic acid, polyacrylonitrile, sodium alginate, polyvinyl alcohol, polybutyl acrylate and polyethylene oxide;
preferably, the active material is a lithium iron phosphate material, the conductive agent is a carbon nanotube and conductive carbon black, the binder is polyvinylidene fluoride and polyacrylic acid,
the active material, the conductive agent and the binder are 96: 1.5: 2.5 by weight;
preferably, the active material is a phosphorus graphite material, the conductive agent is graphene and conductive carbon black, the binder is sodium carboxymethylcellulose, styrene-butadiene rubber and polyacrylonitrile,
the weight ratio of active material, conductive agent and binder is 96.5: 2: 1.5.
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