CN109256526B - Pole piece lithium supplementing device - Google Patents
Pole piece lithium supplementing device Download PDFInfo
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- CN109256526B CN109256526B CN201710567630.0A CN201710567630A CN109256526B CN 109256526 B CN109256526 B CN 109256526B CN 201710567630 A CN201710567630 A CN 201710567630A CN 109256526 B CN109256526 B CN 109256526B
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- roller
- lithium
- pole piece
- mechanisms
- coating
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 219
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 219
- 230000001502 supplementing effect Effects 0.000 title claims abstract description 59
- 230000007246 mechanism Effects 0.000 claims abstract description 151
- 238000005096 rolling process Methods 0.000 claims abstract description 61
- 239000011248 coating agent Substances 0.000 claims abstract description 57
- 238000000576 coating method Methods 0.000 claims abstract description 57
- 239000002002 slurry Substances 0.000 claims abstract description 54
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 7
- 238000004513 sizing Methods 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 9
- 238000002955 isolation Methods 0.000 description 6
- 239000011230 binding agent Substances 0.000 description 4
- 239000006258 conductive agent Substances 0.000 description 4
- 239000004519 grease Substances 0.000 description 4
- 239000000314 lubricant Substances 0.000 description 4
- 230000001050 lubricating effect Effects 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- -1 polytetrafluoroethylene Polymers 0.000 description 3
- 229910052582 BN Inorganic materials 0.000 description 2
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004642 Polyimide Substances 0.000 description 2
- 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 description 2
- 239000006230 acetylene black Substances 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 238000003490 calendering Methods 0.000 description 2
- 239000002041 carbon nanotube Substances 0.000 description 2
- 229910021393 carbon nanotube Inorganic materials 0.000 description 2
- 239000001768 carboxy methyl cellulose Substances 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 229910021389 graphene Inorganic materials 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- QLOAVXSYZAJECW-UHFFFAOYSA-N methane;molecular fluorine Chemical compound C.FF QLOAVXSYZAJECW-UHFFFAOYSA-N 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920001721 polyimide Polymers 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 229920002545 silicone oil Polymers 0.000 description 2
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 description 2
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 239000006255 coating slurry Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000003273 ketjen black Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 229920001084 poly(chloroprene) Polymers 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920005668 polycarbonate resin Polymers 0.000 description 1
- 239000004431 polycarbonate resin Substances 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 238000007761 roller coating Methods 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 235000019832 sodium triphosphate Nutrition 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/043—Processes of manufacture in general involving compressing or compaction
- H01M4/0435—Rolling or calendering
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention provides a pole piece lithium supplementing device which comprises a rolling mechanism, a lithium belt conveying mechanism, a pole piece conveying mechanism and a coating mechanism. The rolling mechanism comprises a first roller, a second roller and a third roller which are sequentially arranged; the lithium belt conveying mechanism is used for conveying the lithium belt between the first roller and the second roller for rolling; the coating mechanism at least can coat sizing agent on the surface of the lithium belt opposite to the second roller; the pole piece conveying mechanism is used for conveying the pole piece between the second roller and the third roller for rolling. The coating mechanism can coat slurry on the surface of the lithium belt opposite to the second roller, and the lithium belt is rolled and attached to the second roller; and as the second roller rotates, the lithium belt attached to the second roller contacts with the pole piece and is attached to the pole piece. The lithium strip after being rolled is directly attached to the second roller by the pole piece lithium supplementing device, and the lithium strip is directly covered on the pole piece by the second roller without a transfer film in the prior art, so that the production cost is reduced, and the lithium supplementing process is simplified.
Description
Technical Field
The invention relates to the field of battery production, in particular to a pole piece lithium supplementing device.
Background
With the development of modern society, various intelligent devices (mobile phones, notebook computers, tablets, electric vehicles, etc.) have been widely used. At the same time, the customer demand for high performance batteries is also increasing. The lithium ion battery is widely applied to the fields of consumer electronics and electric automobiles due to the advantages of high energy density, long service life, green pollution-free performance, safety performance and the like. In terms of improving the energy density of a lithium battery, a lithium supplementing process is taken as one of key technologies.
The existing lithium supplementing process is generally to firstly calender a lithium belt on a transfer film and then cover the lithium belt on the transfer film on two sides of a pole piece. However, the transfer film is usually used only once, and the cost is extremely high; meanwhile, the transfer film needs to be pulled and transferred to laminating equipment, occupies a large space, and causes complex lithium supplementing process.
Disclosure of Invention
In view of the problems existing in the background art, the invention aims to provide a pole piece lithium supplementing device which can reduce the production cost and simplify the lithium supplementing process.
In order to achieve the above purpose, the invention provides a pole piece lithium supplementing device, which comprises a rolling mechanism, a lithium belt conveying mechanism, a pole piece conveying mechanism and a coating mechanism. The rolling mechanism comprises a first roller, a second roller and a third roller which are sequentially arranged; the lithium belt conveying mechanism is used for conveying the lithium belt between the first roller and the second roller; the coating mechanism at least can coat sizing agent on the surface of the lithium belt opposite to the second roller; the pole piece conveying mechanism is used for conveying the pole piece between the second roller and the third roller. The first roller and the second roller are used for rolling the lithium belt coated with the slurry and enabling the rolled lithium belt to be attached to the second roller; the second roller and the third roller are used for rolling the lithium belt and the pole piece attached to the second roller.
The beneficial effects of the invention are as follows:
In the pole piece lithium supplementing device, the coating mechanism can coat sizing agent on the surface of the lithium belt opposite to the second roller in the process of conveying the lithium belt by the lithium belt conveying mechanism; after the lithium belt conveying mechanism conveys the lithium belt between the first roller and the second roller, the lithium belt is rolled by the first roller and the second roller and is adhered to the second roller; along with the rotation of the second roller, the lithium belt attached to the second roller is contacted with the pole piece and is attached to the pole piece by the rolling of the second roller and the third roller; when the pole piece is penetrated out from the gap between the second roller and the third roller, the lithium belt can be peeled off from the second roller and attached to the pole piece, so that lithium supplementing of the pole piece is realized. The lithium strip after being rolled is directly attached to the second roller by the pole piece lithium supplementing device, and the lithium strip is directly covered on the pole piece by the second roller without a transfer film in the prior art, so that the production cost is reduced, and the lithium supplementing process is simplified.
Drawings
Fig. 1 to 5 are schematic views of different embodiments of a pole piece lithium supplementing device according to the present invention;
FIG. 6 is a schematic diagram of a coating mechanism of a pole piece lithium-compensating device according to the present invention;
FIG. 7 is a schematic view of a rolling mechanism of a pole piece lithium-compensating device according to the present invention;
fig. 8 is another schematic view of a rolling mechanism of a pole piece lithium supplementing device according to the present invention.
Wherein reference numerals are as follows:
1 roll-in mechanism 45 heater
11 First roller 46 controller
12 Second roller 47 compressed air source
13 Third roller 48 second pipe
14 Drive assembly 49 stirrer
Positive pressure control valve of 2 lithium belt conveying mechanism 4A
3 Pole piece conveying mechanism 4B exhaust control valve
Output control valve of 31 pole piece unreeling roller 4C
32 Pole piece wind-up roll 5 barrier film
4 Coating mechanism 6 barrier film unreeling roller
41 Holding tank 7 isolating film wind-up roll
42 Flow pump L lithium belt
43 First pipe S slurry
44 Coating head P pole piece
Detailed Description
The pole piece lithium supplementing device of the present invention is described in detail below with reference to the accompanying drawings.
Referring to fig. 1 to 8, the pole piece lithium supplementing device according to the present invention includes a rolling mechanism 1, a lithium belt conveying mechanism 2, a pole piece conveying mechanism 3, and a coating mechanism 4. Wherein the rolling mechanism 1 comprises a first roller 11, a second roller 12 and a third roller 13 which are sequentially arranged; the lithium belt conveying mechanism 2 is used for conveying the lithium belt L between the first roller 11 and the second roller 12; the coating mechanism 4 is capable of coating the slurry S on at least the surface of the lithium belt L facing the second roller 12; the pole piece conveying mechanism 3 is used for conveying the pole piece P between the second roller 12 and the third roller 13. The first roller 11 and the second roller 12 are used for rolling the lithium belt L coated with the slurry S and attaching the rolled lithium belt L to the second roller 12; the second roller 12 and the third roller 13 are used for rolling the lithium strip L and the pole piece P attached to the second roller 12.
In the pole piece lithium supplementing device according to the present invention, the coating mechanism 4 coats the slurry S on the surface of the lithium belt L opposite to the second roller 12 during the transportation of the lithium belt L by the lithium belt transporting mechanism 2; after the lithium belt conveying mechanism 2 feeds the lithium belt L between the first roller 11 and the second roller 12, the lithium belt L is rolled by the first roller 11 and the second roller 12 and is adhered to the second roller 12 (the surface of the lithium belt L coated with the slurry S is adhered to the second roller 12); as the second roller 12 rotates, the lithium strip L attached to the second roller 12 contacts the pole piece P and is attached to the pole piece P under the roll presses of the second roller 12 and the third roller 13; when the pole piece P passes through the gap between the second roller 12 and the third roller 13, the lithium strip L can be peeled off from the second roller 12 and attached to the pole piece P, so that lithium supplementing of the pole piece P is realized. The lithium strip L after being rolled is directly attached to the second roller 12 by the pole piece lithium supplementing device, and the lithium strip L is directly covered on the pole piece P by the second roller 12 without a transfer film in the prior art, so that the production cost is reduced, and the lithium supplementing process is simplified.
The release force of the surface of the lithium strip L was adjusted by applying the slurry S. The release force required to separate the lithium strip L from the second roller 12 is less than the release force required to separate the lithium strip L from the pole piece P due to the presence of the slurry S. However, if the slurry S is not applied to the surface of the lithium belt L opposite to the second roller 12, the lithium belt L is caused to adhere to the second roller 12 and cannot be peeled off. After the lithium belt L is separated from the second roller 12, the slurry S may remain on the lithium belt L, or may be adhered to the second roller 12, and the slurry S adhered to the second roller 12 may be scraped off by a doctor blade.
In the pole piece lithium supplementing device according to the present invention, referring to fig. 1 to 5, the rolling mechanism 1 further includes: the driving assembly 14 is connected with the third roller 13. The driving assembly 14 can drive the third roller 13 to move so as to adjust the gap between the second roller 12 and the third roller 13. When the pole piece P needs to be supplemented with lithium, the driving assembly 14 drives the third roller 13 to be close to the second roller 12, so that the pole piece P is compressed for supplementing lithium; when the pole piece P does not need to be supplemented with lithium, the driving assembly 14 drives the third roller 13 to be far away from the second roller 12, so that the pole piece P is loosened and lithium supplement is stopped. In summary, continuous or intermittent lithium replenishment of pole piece P may be accomplished by drive assembly 14.
In the pole piece lithium supplementing device according to the present invention, referring to fig. 1 to 5, the pole piece transporting mechanism 3 includes a pole piece unreeling roller 31 and a pole piece reeling roller 32. The pole piece P needing lithium supplementing is wound on the pole piece unreeling roller 31, passes through the space between the second roller wheel 12 and the third roller wheel 13 under the traction of the pole piece reeling roller 32, and finally is wound on the pole piece reeling roller 32.
In the pole piece lithium supplementing device according to the present invention, the diameter of the first roller 11 is 400mm, the diameter of the second roller 12 is 100mm, and the diameter of the third roller 13 is 400mm. Generally, the second roller 12 rotates at a relatively high speed, so that the matching of the large roller and the small roller can effectively improve the productivity and the lithium supplementing effect. Referring to fig. 1 to 5, the first roller 11, the second roller 12, and the third roller 13 are sequentially arranged side by side.
In the calendering apparatus according to the present invention, the slurry S includes a lubricating solid, a lubricant, a conductive agent, and a binder. Wherein the mass of the lubricating solid is 55% -65% of the total mass of the slurry S; the mass of the lubricant is 30% -40% of the total mass of the slurry S; the mass of the conductive agent is 1% -4% of the total mass of the slurry S; the mass of the binder is 4% -10% of the total mass of the slurry S.
The lubricating solid may comprise at least one of graphite, polytetrafluoroethylene, boron nitride, graphite fluoride, ceramic; the lubricant may include at least one of silicone oil, lithium-based grease, fatty acid amide, silicate, mechanical oil, synthetic grease; the conductive agent may include acetylene black, conductive carbon black, carbon cellulose, carbon nanotubes, ketjen black, graphene; the binder may include at least one of neoprene, polyethylene, polyurethane, polycarbonate resin, polyimide, sodium carboxymethyl cellulose, water glass, sodium tripolyphosphate, polyacrylamide, polyamide.
The viscosity of the paste S can be precisely adjusted by adjusting the proportions of the kinds of the lubricating solid, the lubricant, the conductive agent and the binder, thereby adjusting the parting force of the lithium tape L coated with the paste S. Specifically, a slurry S can be composed of 55% of graphite, 35% of dimethyl silicone oil, 4% of conductive carbon black and 6% of polyethylene, and the viscosity of the slurry S can reach 18000 mPa.s; another paste S can be composed of 58% of boron nitride, 35% of lithium-based grease, 4% of acetylene black and 3% of sodium carboxymethyl cellulose, and the viscosity of the paste S can reach 85000 mPa.s; yet another paste S may consist of 57% graphite fluoride, 35% lithium-based grease, 4% graphene and 4% polyimide, the viscosity of this paste S may be 112000 mPa.s; a further paste S, which may be composed of 60% ceramic, 30% synthetic fat, 2% carbon nanotubes and 8% polyurethane, may have a viscosity of up to 56000 mPa.s.
In the pole piece lithium supplementing device according to the present invention, referring to fig. 6, the coating mechanism 4 includes: a housing tank 41 for housing the slurry S; a flow pump 42; a first pipe 43 that communicates the housing tank 41 with the flow pump 42; a coating head 44 connected to the flow pump 42 and opposed to the lithium belt L conveyed by the lithium belt conveying mechanism 2; a heater 45 for heating the fluid pump 42; and a controller 46 controlling the flow pump 42 and the heater 45. The slurry S in the holding tank 41 can enter the flow pump 42 along the first pipe 43, and the controller 46 controls the output slurry S of the flow pump 42 according to the requirement, and the controller 46 can control the heater 45 to heat the flow pump 42 so as to heat the slurry S in the flow pump 42 and achieve proper coating viscosity; the flow pump 42 feeds the slurry S to the coating head 44, and the coating head 44 coats the slurry S on the surface of the lithium strip L.
In the pole piece lithium supplementing device according to the present invention, the coating mechanism 4 further includes: a compressed air source 47; a second pipe 48 for communicating the housing tank 41 with the compressed air source 47; a stirrer 49 provided in the housing tank 41; a positive pressure control valve 4A provided on the second pipe 48; an exhaust control valve 4B provided on the first pipe 43; and an output control valve 4C provided on the first pipe 43 downstream of the exhaust control valve 4B. The compressed air source 47 may apply positive pressure to the slurry S inside the holding tank 41 through the second conduit 48 to push the slurry S to the flow pump 42. The positive pressure control valve 4A can regulate the pressure output from the compressed air source 47. The agitator 49 agitates the slurry S in the storage tank 41 to discharge air in the slurry S, thereby ensuring uniformity of slurry application. When there is a bubble in the first duct 43, the exhaust control valve 4B (at this time the output control valve 2C is closed) opens and discharges the bubble; when the exhaust control valve 4B is in a closed state and the output control valve 4C is opened, the slurry S enters the flow pump 42 through the first pipe 43. The coating mechanism 4 further includes a host computer for instructing the positive pressure control valve 4A, the exhaust control valve 4B, the output control valve 4C, and the like to operate.
In a first embodiment of the pole piece lithium supplementing device according to the present invention, referring to fig. 5, the rolling mechanism 1 is a group and the lithium belt conveying mechanism 2 is a group. The coating mechanism 4 is a group, and the surface of the lithium belt L opposite to the second roller 12 is coated with slurry S; the pole piece lithium supplementing device further comprises: the separator 5 passes between the first roller 11 and the second roller 12 and separates the first roller 11 from the lithium strip L.
Specifically, the lithium supplementing amount of the pole piece P is determined according to the requirement, so that lithium is sometimes supplemented only on one surface of the pole piece P, and therefore, the rolling mechanism 1 may be a group, and the lithium belt conveying mechanism 2 may be a group (only one lithium belt L is conveyed). In the rolling process of the lithium belt L (i.e., the first roller 11 and the second roller 12 roll-press the lithium belt L), however, in order to prevent the lithium belt L from adhering to the first roller 11, it is necessary to separate the first roller 11 from the lithium belt L using the separator 5. The rolling of the first roller 11 and the second roller 12 may cause the lithium tape L to adhere to the separator 5, so that the release force required for separating the lithium tape L from the separator 5 should be smaller than the release force required for separating the lithium tape L from the second roller 12 in order to avoid the adhesion of the lithium tape L after the rolling to the separator 5.
In addition, the pole piece lithium supplementing device can further comprise an isolating film unreeling roller 6 and an isolating film reeling roller 7. The isolation film 5 is wound on the isolation film unreeling roller 6, passes through the space between the first roller 11 and the second roller 12 under the traction of the isolation film reeling roller 7, and finally is wound on the isolation film reeling roller 7. The isolating film 5 is separated from the lithium belt L under the traction of the isolating film winding roller 7.
In a second embodiment of the pole piece lithium supplementing device according to the present invention, referring to fig. 4, the rolling mechanism 1 is a group and the lithium belt conveying mechanism 2 is a group. The coating mechanisms 4 are two groups, the two surfaces of the lithium tape L are coated with the slurry S, and the two groups of coating mechanisms 4 are different in viscosity of the slurry S.
Specifically, the lithium supplementing amount of the pole piece P is determined according to the requirement, so that lithium is sometimes supplemented only on one surface of the pole piece P, and therefore, the rolling mechanism 1 may be a group, and the lithium belt conveying mechanism 2 may be a group (only one lithium belt L is conveyed). In the rolling process of the lithium belt L (i.e., the first roller 11 and the second roller 12 roll-press the lithium belt L), in order to prevent the lithium belt L from adhering to the first roller 11, the slurry S may be also coated on the surface of the lithium belt L opposite to the first roller 11; by adjusting the viscosity of the coating paste S by the two sets of coating mechanisms 4, the adhesion of the lithium strip L after the calendaring to the second roller 12 is ensured instead of the first roller 11. In other words, the two surfaces of the rolled lithium strip L are adhered to the first roller 11 and the second roller 12, respectively, and the viscosity of the coating slurry S is adjusted by the two sets of coating mechanisms 4, so that the release force required for separating the lithium strip L from the first roller 11 is smaller than the release force required for separating the lithium strip L from the second roller 12.
In a third embodiment of the pole piece lithium supplementing device according to the present invention, referring to fig. 2, the rolling mechanism 1 is two groups, and the lithium belt conveying mechanism 2 is two groups. The coating mechanisms 4 are two groups, and the slurry S is coated on the surfaces of the lithium strips L conveyed by the lithium strip conveying mechanisms 2 and opposite to the second roller 12; the pole piece lithium supplementing device further comprises: the separator 5 passes between the first roller 11 and the second roller 12 of the two sets of rolling mechanisms 1, and separates the first roller 11 of each rolling mechanism 1 from the lithium strip L.
Specifically, when lithium is required to be supplemented to both surfaces of the pole piece P, two sets of rolling mechanisms 1 are required to be provided, the pole piece P sequentially passes through the two rolling mechanisms 1, and when the pole piece P passes through the previous rolling mechanism 1, one surface of the pole piece P is opposite to the second roller 12 of the rolling mechanism 1, and when the pole piece P passes through the next rolling mechanism 1, the other surface of the pole piece P is opposite to the second roller 12 of the rolling mechanism 1. Correspondingly, two groups of lithium belt conveying mechanisms 2 are also required to convey the lithium belts L to the corresponding rolling mechanisms 1, and two groups of coating mechanisms 4 are required to coat the corresponding lithium belts L with the slurry S. That is, the set of lithium belt transporting mechanisms 2, the set of coating mechanisms 4, and the set of rolling mechanisms 1 constitute a module for replenishing lithium on one surface of the pole piece P; the other group of lithium belt conveying mechanisms 2, the other group of coating mechanisms 4 and the other group of rolling mechanisms 1 form a module for supplementing lithium on the other surface of the pole piece P.
The two sets of lithium belt conveying mechanisms 2 convey two lithium belts L, and in order to prevent the lithium belts L from adhering to the corresponding first rollers 11 during the rolling of each lithium belt L, it is necessary to separate the first rollers 11 from the lithium belts L using the separator 5. Meanwhile, in order to ensure that the lithium strip L after being rolled is attached to the second roller 12 instead of the separator 5, the release force required for separating the lithium strip L from the separator 5 should be smaller than the release force required for separating the lithium strip L from the second roller 12.
The isolating film 5 can be one sheet and simultaneously passes through the two sets of rolling mechanisms 1 under the guidance of a plurality of passing rollers; correspondingly, the pole piece lithium supplementing device also comprises an isolating film unreeling roller 6 and an isolating film reeling roller 7. Of course, the number of the isolation films 5 can be two, and the isolation films can respectively pass through the two sets of rolling mechanisms 1; correspondingly, the isolating film unreeling roller 6 and the isolating film reeling roller 7 can be divided into two groups.
In a fourth embodiment of the pole piece lithium supplementing device according to the present invention, referring to fig. 2, the rolling mechanism 1 is two groups, and the lithium belt conveying mechanism 2 is two groups. The roller coating mechanisms 4 are four groups; the two groups of coating mechanisms 4 respectively coat slurry S on the two surfaces of the lithium belt L conveyed by the lithium belt conveying mechanism 2, and the two groups of coating mechanisms 4 are different in viscosity; the other two groups of coating mechanisms 4 respectively coat the slurry S on the two surfaces of the lithium tape L conveyed by the other group of lithium tape conveying mechanisms 2, and the viscosities of the coating mechanisms 4 for coating the slurry S are different.
Specifically, the pole piece P sequentially passes through the two rolling mechanisms 1, and when the pole piece P passes through the former rolling mechanism 1, one surface of the pole piece P is opposite to the second roller 12 of the rolling mechanism 1, and when the pole piece P passes through the latter rolling mechanism 1, the other surface of the pole piece P is opposite to the second roller 12 of the rolling mechanism 1.
The two sets of lithium belt conveying mechanisms 2 convey two lithium belts L, and the adhesion of the lithium belts L after the rolling to the second roller 12, not to the first roller 11, is ensured by adjusting the viscosity of the slurry S applied by the two sets of applying mechanisms 4 corresponding to each lithium belt L.
In a fifth embodiment of the pole piece lithium supplementing device according to the present invention, referring to fig. 3, the rolling mechanism 1 is two groups, and the lithium belt conveying mechanism 2 is two groups. The coating mechanisms 4 are three groups; the two groups of coating mechanisms 4 respectively coat slurry S on the two surfaces of the lithium belt L conveyed by the lithium belt conveying mechanism 2, and the two groups of coating mechanisms 4 are different in viscosity; the third group coating mechanism 4 coats the slurry S on the surface of the lithium belt L conveyed by the other group lithium belt conveying mechanism 2, which is opposite to the second roller 12; the pole piece lithium supplementing device further comprises: the separator 5 passes between the first roller 11 and the second roller 12 of the roll pressing mechanism 1 corresponding to the other group of lithium belt transporting mechanisms 2, and separates the first roller 11 of the roll pressing mechanism 1 from the lithium belt L.
Specifically, the pole piece P sequentially passes through the two rolling mechanisms 1, and when the pole piece P passes through the former rolling mechanism 1, one surface of the pole piece P is opposite to the second roller 12 of the rolling mechanism 1, and when the pole piece P passes through the latter rolling mechanism 1, the other surface of the pole piece P is opposite to the second roller 12 of the rolling mechanism 1.
Two sets of lithium belt conveying mechanisms 2 convey two lithium belts L, one lithium belt L is ensured to be attached to the corresponding second roller 12 through two surface sizing agents S, and the other lithium belt L is ensured to be attached to the corresponding second roller 12 through the isolating film 5. The pole piece lithium supplementing device can also comprise an isolating film unreeling roller 6 and an isolating film reeling roller 7.
Claims (10)
1. The pole piece lithium supplementing device is characterized by comprising a rolling mechanism (1), a lithium belt conveying mechanism (2), a pole piece conveying mechanism (3) and a coating mechanism (4);
The rolling mechanism (1) comprises a first roller (11), a second roller (12) and a third roller (13) which are sequentially arranged;
the lithium belt conveying mechanism (2) is used for conveying the lithium belt (L) between the first roller (11) and the second roller (12);
the coating mechanism (4) comprises a containing tank (41), a flow pump (42), a first pipeline (43) and a coating head (44), wherein the containing tank (41) is used for containing the slurry (S), the first pipeline (43) is communicated with the containing tank (41) and the flow pump (42), the coating head (44) is connected with the flow pump (42) and is opposite to the lithium belt (L), and the coating mechanism (4) can at least coat the slurry (S) on the surface of the lithium belt (L) opposite to the second roller (12);
The pole piece conveying mechanism (3) is used for conveying the pole piece (P) between the second roller (12) and the third roller (13);
Wherein,
The first roller (11) and the second roller (12) are used for rolling the lithium belt (L) coated with the slurry (S) and enabling the rolled lithium belt (L) to be attached to the second roller (12);
the second roller (12) and the third roller (13) are used for rolling the lithium belt (L) and the pole piece (P) attached to the second roller (12).
2. The pole piece lithium supplementing device according to claim 1, wherein the rolling mechanism (1) is a group, and the lithium belt conveying mechanism (2) is a group.
3. The pole piece lithium supplementing device according to claim 2, wherein,
The coating mechanism (4) is a group, and the surface of the lithium belt (L) opposite to the second roller (12) is coated with sizing agent (S);
the pole piece lithium supplementing device further comprises: and a separator (5) passing between the first roller (11) and the second roller (12) and separating the first roller (11) from the lithium strip (L).
4. The pole piece lithium supplementing device according to claim 2, wherein the coating mechanisms (4) are two groups, the two surfaces of the lithium strip (L) are respectively coated with the slurry (S), and the two groups of coating mechanisms (4) are different in viscosity of the slurry (S).
5. The pole piece lithium supplementing device according to claim 1, wherein the number of the rolling mechanisms (1) is two, and the number of the lithium belt conveying mechanisms (2) is two.
6. The pole piece lithium supplementing device according to claim 5, wherein,
The coating mechanisms (4) are two groups, and the surfaces of the lithium belts (L) conveyed by the lithium belt conveying mechanisms (2) and opposite to the second roller (12) are respectively coated with sizing agent (S);
The pole piece lithium supplementing device further comprises: and a separator (5) passing between the first roller (11) and the second roller (12) of the two sets of rolling mechanisms (1) and separating the first roller (11) of each rolling mechanism (1) from the lithium strip (L).
7. The pole piece lithium supplementing device according to claim 5, wherein,
The coating mechanisms (4) are four groups;
The two groups of coating mechanisms (4) respectively coat slurry (S) on the two surfaces of the lithium belt (L) conveyed by the group of lithium belt conveying mechanisms (2), and the viscosity of the slurry (S) coated by the two groups of coating mechanisms (4) is different;
The other two groups of coating mechanisms (4) respectively coat the slurry (S) on the two surfaces of the lithium belt (L) conveyed by the other group of lithium belt conveying mechanisms (2), and the viscosity of the slurry (S) coated by the other two groups of coating mechanisms (4) is different.
8. The pole piece lithium supplementing device according to claim 5, wherein,
The coating mechanisms (4) are three groups;
The two groups of coating mechanisms (4) respectively coat slurry (S) on the two surfaces of the lithium belt (L) conveyed by the group of lithium belt conveying mechanisms (2), and the viscosity of the slurry (S) coated by the two groups of coating mechanisms (4) is different;
the third group coating mechanism (4) coats sizing agent (S) on the surface of the lithium belt (L) conveyed by the other group lithium belt conveying mechanism (2) and opposite to the second roller (12);
The pole piece lithium supplementing device further comprises: and a separator (5) passing between the first roller (11) and the second roller (12) of the roller mechanism (1) corresponding to the other group of lithium belt conveying mechanisms (2) and separating the first roller (11) of the roller mechanism (1) from the lithium belt (L).
9. The pole piece lithium supplementing device according to claim 3,6 or 8, further comprising an isolating film unreeling roller (6) and an isolating film reeling roller (7).
10. The pole piece lithium supplementing device according to claim 1, wherein the rolling mechanism (1) further comprises: and the driving assembly (14) is connected with the third roller (13).
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| CN112186133B (en) * | 2019-07-05 | 2024-08-09 | 宁德时代新能源科技股份有限公司 | Device for supplementing lithium to pole piece |
| CN112186132B (en) * | 2019-07-05 | 2024-08-09 | 宁德时代新能源科技股份有限公司 | Device for supplementing lithium to pole piece |
| CN118645590A (en) * | 2019-11-21 | 2024-09-13 | 宁德时代新能源科技股份有限公司 | Pole piece lithium supplementing device and pole piece lithium supplementing method |
| CN111952536A (en) * | 2020-09-21 | 2020-11-17 | 深圳市镭煜科技有限公司 | Horizontal lithium all-in-one of mending of calendering |
| CN114628638A (en) * | 2020-12-10 | 2022-06-14 | 广东坤川实业有限公司 | Lithium-supplementing, rolling and film-covering device for lithium battery pole piece |
| CN114628639A (en) * | 2020-12-10 | 2022-06-14 | 广东坤川实业有限公司 | Lithium is mended to lithium battery pole piece and is rolled tectorial membrane all-in-one |
| CN113964295B (en) * | 2021-10-19 | 2023-06-16 | 远景动力技术(江苏)有限公司 | Lithium supplementing device and lithium supplementing method for negative electrode plate of lithium ion battery |
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