CN114914387B - Electrode slice slurry hanging process and slurry hanging device - Google Patents
Electrode slice slurry hanging process and slurry hanging device Download PDFInfo
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- CN114914387B CN114914387B CN202110181703.9A CN202110181703A CN114914387B CN 114914387 B CN114914387 B CN 114914387B CN 202110181703 A CN202110181703 A CN 202110181703A CN 114914387 B CN114914387 B CN 114914387B
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- 239000002002 slurry Substances 0.000 title claims abstract description 304
- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000008569 process Effects 0.000 title claims abstract description 29
- 230000007246 mechanism Effects 0.000 claims description 70
- 239000011267 electrode slurry Substances 0.000 claims description 34
- 239000002131 composite material Substances 0.000 claims description 27
- 238000007581 slurry coating method Methods 0.000 claims description 27
- 238000000576 coating method Methods 0.000 claims description 25
- 239000011248 coating agent Substances 0.000 claims description 24
- 230000009471 action Effects 0.000 claims description 21
- 238000004513 sizing Methods 0.000 claims description 17
- 239000002904 solvent Substances 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 10
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 239000002003 electrode paste Substances 0.000 claims description 5
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 4
- 239000002612 dispersion medium Substances 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 4
- 239000012046 mixed solvent Substances 0.000 claims description 4
- 239000003960 organic solvent Substances 0.000 claims description 4
- 230000001276 controlling effect Effects 0.000 claims description 3
- 239000003792 electrolyte Substances 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 2
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 claims description 2
- 239000008367 deionised water Substances 0.000 claims description 2
- 229910021641 deionized water Inorganic materials 0.000 claims description 2
- 239000004210 ether based solvent Substances 0.000 claims description 2
- 238000005096 rolling process Methods 0.000 claims description 2
- 238000007493 shaping process Methods 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 238000011031 large-scale manufacturing process Methods 0.000 abstract description 2
- 238000007790 scraping Methods 0.000 description 14
- 230000004048 modification Effects 0.000 description 7
- 238000012986 modification Methods 0.000 description 7
- 238000013329 compounding Methods 0.000 description 6
- 150000001875 compounds Chemical class 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000007772 electrode material Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000002861 polymer material Substances 0.000 description 2
- -1 polytetrafluoroethylene Polymers 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 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
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0409—Methods of deposition of the material by a doctor blade method, slip-casting or roller coating
-
- 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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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
Compared with the bottom-up slurry pulling mode in the prior art, the slurry hanging process for the electrode plate is more suitable for preparing thick electrodes. The invention also provides a slurry hanging device capable of realizing the slurry hanging process, wherein the slurry hanging device can be provided with a plurality of slurry boxes at the same time, or the bottom of each slurry box can be provided with a plurality of electrode plate through grooves, and a plurality of electrode plates can be used for simultaneously hanging slurry, so that the slurry hanging efficiency is improved. Therefore, the invention can continuously, efficiently and inexpensively prepare the ultra-thick electrode slice and realize the large-scale production of the ultra-thick electrode slice.
Description
Technical Field
The invention relates to the field of batteries, in particular to a slurry hanging process and a slurry hanging device for a battery pole piece.
Background
In the existing manufacturing process of the battery pole piece, the precise coating-rolling-slitting process adopted by the lithium ion battery is partially adopted in the lead-acid battery, the thickness of the electrode material layer prepared by the process is generally not more than 0.3mm, and the problems of uneven thickness, cracking, falling off and the like of the electrode material layer can be caused by increasing the thickness. In addition, when the precise coating method is adopted to prepare the electrode plate coated on both sides, secondary coating forming is needed, the process is complex, the preparation efficiency is low, and the cost is high.
Disclosure of Invention
Compared with the bottom-up slurry pulling mode in the prior art, the slurry hanging mode from top to bottom in the slurry hanging process of the electrode plate is more suitable for preparing thick electrodes. The invention also provides a slurry hanging device capable of realizing the slurry hanging process, wherein the slurry hanging device can be provided with a plurality of slurry boxes at the same time, or the bottom of each slurry box can be provided with a plurality of electrode plate through grooves, and a plurality of electrode plates can be used for simultaneously hanging slurry, so that the slurry hanging efficiency is improved. Therefore, the invention can continuously, efficiently and inexpensively prepare the ultra-thick electrode slice and realize the large-scale production of the ultra-thick electrode slice.
The technical scheme provided by the invention is as follows:
the invention provides an electrode plate slurry hanging process, wherein one or more pretreated electrode plates simultaneously pass through one or more scraper slits at the bottom of a slurry box of a slurry hanging device from top to bottom under the action of a guide mechanism, electrode slurry is arranged in the slurry box, and one side or two sides of each electrode plate can be coated with electrode layers with the same or different thickness after the electrode plates pass through the electrode slurry in the slurry box by controlling the scraper slits at the bottom of the slurry box, so that the electrode plates are formed.
The pole piece in the invention can be a porous current collector matrix and comprises porous conductive materials such as porous aluminum foil, porous copper foil, copper mesh, stainless steel mesh and the like.
In the traditional slurry pulling process, the slurry pulling direction of the electrode plate is from bottom to top, and the mode is not suitable for the condition that the slurry layer is thicker, because when the slurry layer is thicker, the slurry layer can fall firstly under the action of dead weight and then pass through the scraper, and at the moment, the slurry layer is thinner. When the battery pole piece of the invention hangs slurry, the pole piece moves from top to bottom, the scraper opening is positioned at the bottom of the slurry box, the pole piece passes through the scraper opening first, the slurry layer becomes flat, uniform and compact after passing through the slurry scraping device, and particularly, when the solid content of the slurry is higher, the slurry can not fall off.
One or more pole pieces are arranged in the slurry box, the slurry box is divided into a plurality of areas, and the areas can be provided with the same electrode slurry according to different requirements, so that electrode layers on two sides of the electrode pieces after slurry hanging are completely the same; different electrode slurries can be arranged, so that electrode layers on two sides of the electrode plate are different after slurry coating; or, the electrode slurry can be arranged on one side of the areas on two sides of the pole piece, and the electrode slurry is not arranged on the other side of the pole piece, so that only one side of the pole piece is provided with the electrode layer after slurry coating.
According to the invention, the components and/or proportions of the sizing agent on the two sides of the pole piece in the sizing agent box are the same or different: the electrode slurry can be aqueous slurry, including slurry with deionized water as a dispersion medium; the electrode slurry may be an oil-based slurry including a slurry in which an organic solvent such as N-methylpyrrolidone is a dispersion medium; the electrode slurry may be an electrolyte system including a mixed solvent of an ether solvent and a carbonate solvent, or a mixed solvent of two or more ether solvents; the electrode paste may also be other battery systems, such as sodium ion battery pastes, as well as pastes including other non-battery industries (e.g., solid-liquid mixtures, such as mixtures of PVC and calcium carbonate). The arrangement can realize the coating of different materials on the surface of the slurry coating base material at one time so as to play different roles, and the electrode plate compounding step after the combination can realize the one-time compound forming of the electrode plates with different structures.
According to the electrode plate slurry coating process, only one electrode plate can be coated with slurry from top to bottom according to the requirement, and a plurality of electrode plates can be coated with slurry simultaneously to obtain a plurality of electrode plates, and when the electrode plates are coated with slurry simultaneously, a plurality of slurry boxes or a plurality of scraper slits are arranged at the bottom of one slurry box.
Furthermore, in the invention, the electrode plates after each two adjacent or each several adjacent paste hanging can be attached to form the composite electrode plate with the sandwich composite structure layer under the action of the guiding mechanism inside the paste box or outside the paste box.
In the invention, the pole piece can be pretreated, and the pretreatment process comprises the steps of first slurry hanging and pole piece white setting. The first slurry coating means that the surface of the pole piece is pre-treated and then is subjected to slurry coating in advance to form a thin electrode layer, so that the bonding performance of the current collector and the electrode material is improved; the setting of the pole piece for white is to set white parts on two sides of the pole piece, wherein the white parts are obtained by adopting a mode of sticking adhesive tapes on two side edges of the pole piece or setting a pole piece white mechanism inside a slurry box.
The electrode plate slurry coating process comprises the following steps of:
s1: electrode slurry is prepared: electrode slurry is prepared according to the proportion as required;
s2: pole piece pretreatment: carrying out primary slurry hanging and/or white part pretreatment on the pole piece;
s3: placing a pole piece: the pole piece pretreated in the step S2 is subjected to constant tension, deviation adjustment and shaping, and sequentially passes through the top of the slurry box from top to bottom through a guide mechanism and enters a scraper slit at the bottom of the slurry box, so that the pole piece is in a tensioned and flat state under the action of the constant tension;
s4: injecting electrode slurry: injecting the same or different electrode slurries into two sides of the pole piece in the slurry box according to the requirement;
s5: hanging slurry: electrode slices in the slurry box sequentially pass through the top of the slurry box and the scraper slits at the bottom of the slurry box from top to bottom under the action of the transmission mechanism, electrode slurries at two sides of the electrode slices in the slurry box are dipped and coated on two sides of the electrode slices, and then redundant attached slurries are scraped off by the scraper at the bottom of the slurry box to form electrode slices with flat surfaces and uniform thickness;
s6: and (3) rolling: and the electrode plate after the slurry coating is dried and is used as a battery electrode plate for standby.
Further, the steps S5 and S6 further comprise the following steps:
composite electrode sheet: and each two or each adjacent plurality of electrode plates are attached together to form the composite electrode plate with the sandwich composite structure layer by the action of the guide mechanism inside the slurry box or outside the slurry box.
Further, the steps S5 and S6 further comprise the following steps:
spray humidification: when a solvent slurry system with high viscosity and easy volatilization is adopted, the solvent spraying and humidifying process is increased in order to prevent dry material blockage caused by solvent volatilization in the slurry near the discharge port of the scraper.
According to the invention, the composite electrode sheet can have a plurality of different composite modes:
in some embodiments, the slurry hanging device is provided with a slurry box, a pole piece through groove is arranged at the bottom of the slurry box, the guide mechanism is positioned inside the slurry box, and a plurality of pole pieces are guided to pass through the pole piece through groove at the bottom of the slurry box at the same time inside the slurry box, so that pole piece compounding is completed.
In some embodiments, the slurry hanging device is provided with a plurality of slurry boxes, a pole piece through groove is arranged at the bottom of each slurry box, and after the plurality of pole pieces respectively pass through the coating mechanism at the bottom of the slurry box, an electrode plate is formed by compounding under the action of the guiding mechanism. The guiding mechanism is positioned outside the slurry box.
In some embodiments, the slurry hanging device is provided with a slurry box, the bottom of the slurry box is provided with a plurality of through slots for pole pieces, and the pole pieces are respectively combined to form an electrode plate under the action of the guiding mechanism after passing through the coating mechanism at the bottom of the slurry box. The guiding mechanism is positioned outside the slurry box.
The invention also provides an electrode plate slurry hanging device, which comprises a guide mechanism, at least one slurry box and a coating mechanism positioned at the bottom of the slurry box, wherein one or more electrode plate through grooves are formed in the bottom of the slurry box and used for one or more electrode plates to pass through, the electrode plate inlet of the slurry box is positioned at the upper part of the electrode plate through grooves, and the pretreated electrode plates sequentially pass through the electrode plate inlet of the slurry box, the electrode plate through grooves at the bottom and the coating mechanism from top to bottom, so that the electrode plate with controllable slurry layer thickness and even surface is obtained.
The slurry hanging device can be provided with a plurality of slurry boxes at the same time, or the bottom of each slurry box can be provided with a plurality of electrode plate through grooves, and a plurality of electrode plates can be used for hanging slurry at the same time, so that the slurry hanging efficiency is improved.
Preferably, the slurry box can be a U-shaped slurry box with a pole piece through groove at the bottom, and the pole piece inlet is an upper top opening of the slurry box; further, the top of the slurry box is provided with a top cover to prevent dust or other foreign matters from falling into the slurry box, and the pole piece inlet can be formed in the top cover.
Or the slurry box can also be a U-shaped slurry box with pole piece through grooves at the bottom, wherein a group of opposite modules are fixed together through mechanical fixing or bonding.
The slurry box is not limited to U-shaped, and can be used for fixing slurry and realizing pole piece slurry hanging.
The material of the slurry box is selected from a plurality of organic solvent-resistant high polymer materials such as stainless steel, polytetrafluoroethylene and the like, which can resist organic solvents and have certain strength.
When a solvent slurry system with high viscosity and easy volatilization is adopted, a spray humidifying mechanism can be arranged at the bottom end of the slurry box, and can be a fine mist nozzle connected with a solvent storage bottle and arranged on one side or two sides of a slurry tank in order to prevent dry material blockage caused by volatilization of solvent in slurry near a scraper discharge hole.
The surface of the slurry box can be provided with a constant-temperature water jacket or an oil jacket to ensure that slurry is hung in a constant temperature, and the slurry viscosity and other states are prevented from changing due to overhigh or overlow temperature.
The two sides of the pole piece can be provided with a white part in the process of hanging the slurry, and the white part can be obtained by attaching adhesive tapes to the edges of the two sides of the pole piece or arranging a pole piece white mechanism in the slurry box.
Further, the inside of thick liquids box is equipped with pole piece and stays white mechanism, including setting up the guide rail at thick liquids box opposite both sides edge and thick liquids box bottom to and can follow a set of regulating plate that leads to the groove direction parallel slip with the pole piece on the guide rail, the regulating plate is through the size that leaves white with the regulation pole piece on the guide rail, thick liquids are located between a set of regulating plate. The adjusting plate is provided with a pole piece clamping groove, and the blank part at the edge of the pole piece can pass through the clamping groove, but the slurry can not leak to the outside of the adjusting plate from the clamping groove. The pole piece clamping groove can be formed by a group of contact pieces with smooth surfaces, wear resistance and electrolyte corrosion resistance in a relative arrangement, and the gap of the pole piece clamping groove is 0-2mm. The pole piece clamping groove is arranged between a pole piece inlet of the slurry box and a pole piece through groove at the bottom of the slurry box, and plays roles of keeping white, supporting and guiding the pole piece. Preferably, the guide rail is provided with scales to accurately adjust the size of the pole piece left white.
The bottom of the slurry box is provided with a coating mechanism, and the coating mechanism can be connected with the slurry box through a fixing plate. The coating mechanism comprises a scraping device, a side plate for installing the scraping device and another side plate vertically and fixedly connected with two ends of the side plate. The side plate is used for installing an adjusting mechanism of the slurry scraping device, the other side plate is provided with a sliding rail for the slurry scraping device to slide, and the size of a gap of the slurry scraping device is adjusted by adjusting the adjusting mechanism on the side plate, so that the size of a gap of a through groove of a pole piece at the bottom of the slurry box is adjusted.
The sizing device is a pair of scrapers or squeeze rollers or a combination of the scrapers and squeeze rollers, wherein the scrapers or squeeze rollers are movably adjustable along a direction perpendicular to the movement direction of the pole pieces, and the size of a gap of a pole piece through groove at the bottom of the sizing box can be controlled by adjusting the sizing device, so that the thickness of sizing layers on two sides of the pole pieces is controlled.
The size of the through groove of the pole piece at the bottom of the slurry box can be controlled by using a micrometer head, an adjusting bolt and the like to adjust the slurry scraping device and matching with a feeler gauge, so that the thickness of slurry layers at two sides of the pole piece is controlled.
The pretreated pole piece sequentially passes through a pole piece inlet of the slurry box, the inside of the slurry box and a pole piece through groove at the bottom of the slurry box under the action of the guide mechanism, the pole piece hangs slurry from top to bottom under the action of the guide mechanism, and the electrode piece with a smooth and uniform slurry layer surface and controllable thickness is obtained under the action of a slurry scraping device at the bottom of the slurry box.
In some embodiments, the slurry hanging device is provided with a slurry box, and the bottom of the slurry box is provided with a pole piece through groove.
In some embodiments, the slurry hanging device is provided with a slurry box, and the bottom of the slurry box is provided with a plurality of pole piece through grooves.
In some embodiments, the slurry hanging device is provided with a plurality of slurry boxes, and one or more pole piece through grooves are arranged at the bottom of each slurry box.
When a plurality of slurry boxes are arranged or a plurality of pole piece through grooves are arranged at the bottom of each slurry box, a plurality of electrode plates can be used for simultaneously hanging slurry, so that the production efficiency is improved.
When the bottom of the slurry box is provided with a pole piece through groove, an electrode piece divides the slurry box into two areas in the slurry box; when the bottom of the slurry box is provided with a plurality of pole piece through grooves, the slurry box is divided into a plurality of areas by a plurality of electrode slices in the slurry box.
Electrode slurry with identical components and proportions is arranged in different areas separated into the slurry box, so that slurry layers on two sides of the pole piece are identical; or electrode slurries with different components and/or proportions are arranged in different areas in the slurry box, so that slurry layers on two sides of the pole piece are different; or, at least one of different areas in the slurry box is not filled with slurry, so that one side of the pole piece is provided with a slurry layer.
Preferably, a partition plate can be arranged in the slurry box, so that the slurry box can be divided into different areas, and the pole pieces in the slurry box can be guided and supported. The separator is made of any one of stainless steel materials or polymer materials which have certain strength and are convenient to cut, such as stainless steel plates, acrylic plates, polytetrafluoroethylene plates and the like.
Compared with the prior art, the slurry box is divided into a plurality of areas, and different slurries can be arranged in different areas, so that different technical effects of slurries on two sides of the pole piece are realized, and the effect of single-side slurry hanging of the pole piece can be realized without any slurry in one side area. The slurry may be different in composition or may be different in solid content.
In some embodiments, the electrode layer on one side of the electrode sheet may be a surface-based modification layer, such as a carbon-coated modification layer, and the electrode layer on the other side may be a functional material modification layer, such as a lithium iron phosphate slurry layer containing an active material. The carbon-coated modified layer can change the current collecting effect on the surface of the pole piece, reduce the polarization performance of the battery, and the functional material modified layer is a main energy provider, and the carbon-coated modified layer and the functional material modified layer are finished at the same time, so that the production efficiency can be greatly improved.
After the electrode plate passes through the coating mechanism, the slurry layer on the surface is flat and uniform. In order to control the thickness of the two sides of the electrode sheet more accurately, a group of positioning and correcting rollers are arranged below the coating mechanism, and the positioning and correcting rollers and the guiding mechanism are guided together to correct the thickness of the slurry on the two sides of the electrode sheet more accurately. A set of positioning and correcting rollers are oppositely arranged below the coating mechanism, and electrode plates pass between the positioning and correcting rollers.
The electrode slice with the slurry is put into a baking oven, and is cut or coiled for standby after being dried.
The invention has the advantages that:
1) When the slurry is hung, the battery pole pieces sequentially pass through the pole piece inlet of the slurry box, the pole piece through groove in the slurry box and the pole piece through groove at the bottom of the slurry box from top to bottom, and compared with the traditional slurry pulling mode, the slurry hanging from top to bottom is suitable for preparing thicker electrode pieces with thicker slurry layers;
2) The slurry hanging device is provided with at least one slurry box, wherein one or more pole piece through grooves are formed in the bottom of the slurry box for one or more pole pieces to pass through, so that slurry hanging efficiency can be improved on one hand, and pole piece compounding can be completed by the electrode plates under the action of the guide mechanism to form a battery pair or a battery pack, and production and assembly efficiency of the battery is improved on the other hand;
3) Electrode slurries with identical components and proportions or different proportions are arranged in different areas separated into the slurry box, so that slurry layers on two sides of the pole piece are identical or different; or one side of the slurry box is not provided with slurry, so that an electrode plate with single-side slurry hanging is obtained; the slurry hanging modes are flexible, and the requirements of different electrode plates are met.
Drawings
FIG. 1 is a schematic illustration of a slurry process according to the present invention;
FIGS. 2 (a) -2 (d) are schematic illustrations of an embodiment of a composite electrode sheet in a slurry according to the present invention;
FIG. 3 is a schematic view of the overall structure of the slurry hanging device according to the present invention;
FIG. 4 is a schematic structural view of a coating mechanism in the slurry coating device according to the present invention;
fig. 5 (a) -5 (b) are schematic structural views of a slurry box with a white-keeping mechanism in the slurry hanging device according to the invention.
List of reference numerals
101-pole piece
102-electrode paste
103-scraper
104-doctor blade slit
105-electrode plate
201-electrode plate composite mode one
202-electrode plate composite mode two
203-electrode plate composite mode three
204-electrode plate composite mode four
205-composite electrode plate
301-guiding mechanism
303-slurry box
304-coating mechanism
401-fixed plate
402 micrometer
403-pole piece through groove
404-side plate
405-another side plate
5-pole piece white-keeping mechanism
501-guide rail
502-adjusting plate
503-contact piece
504-pole piece clamping groove
Detailed Description
The invention will be further illustrated by way of example with reference to the accompanying drawings.
In the electrode plate slurry coating process, as shown in fig. 1, a pretreated electrode plate 101 passes through a scraper slit 104 at the bottom of a slurry box of a slurry coating device from top to bottom under the action of a guide mechanism, electrode slurry 102 is arranged in the slurry box, and after the electrode plates pass through the electrode slurry in the slurry box, one side or two sides of each electrode plate can be coated with electrode layers with the same or different thicknesses by controlling the scraper slit 104 at the bottom of the slurry box, so as to form electrode plates 105.
In the invention, in order to improve the production efficiency or obtain the composite electrode plate, a plurality of electrode plates can be simultaneously passed through one or a plurality of scraper slits at the bottom of the slurry hanging device from top to bottom to obtain a plurality of electrode plates or obtain the composite electrode plate under a guide mechanism. The composite electrode sheet 205 is a composite electrode sheet with a sandwich composite structure layer formed by bonding two or more adjacent electrode sheets inside the slurry box or outside the slurry box under the action of a guide mechanism.
The composite electrode sheet can have a plurality of different composite modes:
the electrode plate compound mode one 201, the slurry hanging device is provided with a slurry box, the bottom of the slurry box is provided with a plurality of electrode plate through grooves, and a plurality of electrode plates are respectively compounded to form an electrode plate under the action of a guiding mechanism after passing through a coating mechanism at the bottom of the slurry box. The guiding mechanism is positioned outside the slurry box. As shown in fig. 2 (a).
Electrode plate compound mode two 202, the slurry hanging device is equipped with a thick liquids box, thick liquids box bottom is equipped with a pole piece logical groove, guiding mechanism is located thick liquids box inside, and a plurality of pole pieces are led to pass through a pole piece logical groove of thick liquids box bottom simultaneously in thick liquids box inside, accomplish the pole piece compound. As shown in fig. 2 (b).
And the electrode plate compounding mode III 203 is characterized in that the slurry hanging device is provided with a plurality of slurry boxes, the bottom of each slurry box is provided with a electrode plate through groove, and a plurality of electrode plates are compounded to form an electrode plate under the action of the guide mechanism after passing through the coating mechanism at the bottom of the slurry box respectively. The guiding mechanism is positioned outside the slurry box. As shown in fig. 2 (c).
And the electrode plate compounding mode IV 204 is characterized in that the slurry hanging device is provided with a plurality of slurry boxes, the bottom of each slurry box is provided with a electrode plate through groove, and a plurality of electrode plates are compounded to form a compound electrode plate 205 under the action of a guide mechanism after passing through a coating mechanism at the bottom of each slurry box. The guiding mechanism is positioned outside the slurry box. As shown in fig. 2 (d).
The multiple electrode plates are arranged in the slurry box, the slurry box is divided into multiple areas, as shown in fig. 2 (a), in the embodiment, two electrode plates can divide the slurry box into A, B, C three areas, and according to different requirements, the same electrode slurry can be arranged in the areas, so that electrode layers on two sides of the electrode plates are completely the same after slurry is hung; different electrode slurries can be arranged, so that electrode layers on two sides of the electrode plate are different after slurry coating; or, the electrode slurry can be arranged on one side of the areas on two sides of the pole piece, and the electrode slurry is not arranged on the other side of the pole piece, so that only one side of the pole piece is provided with the electrode layer after slurry coating.
As shown in fig. 3, the electrode plate slurry hanging device of the invention comprises a guiding mechanism 301, at least one slurry box 303 and a coating mechanism 304 positioned at the bottom of the slurry box, wherein one or more electrode plate through grooves 403 are arranged at the bottom of the slurry box 303 for one or more electrode plates 101 to pass through, the electrode plate inlet of the slurry box 303 is positioned at the upper part of the electrode plate through grooves 403, and the pretreated electrode plates 101 sequentially pass through the electrode plate inlet of the slurry box, the electrode plate through grooves 403 at the bottom and the coating mechanism 304 from top to bottom, so that the electrode plate 104 with controllable slurry layer thickness and even surface is obtained.
As shown in fig. 4, the bottom of the slurry box in the present invention is provided with a coating mechanism 304, which can be connected to the slurry box 303 through a fixing plate 401. The coating mechanism 304 includes a scraping device, a side plate 404 for installing the scraping device, and another side plate 405 vertically and fixedly connected to two ends of the side plate 404. The side plate 404 is used for installing an adjusting mechanism of the slurry scraping device, the other side plate 405 is provided with a sliding rail for the slurry scraping device to slide, and the gap size of the slurry scraping device is adjusted by adjusting the adjusting mechanism 402 on the side plate 404, so that the gap size of the slurry box bottom pole piece through groove 403 is adjusted. In this embodiment, the adjusting mechanism is a micrometer, and the scraping device is a scraper.
In this embodiment, the inside of the slurry box 303 is provided with a pole piece leaving mechanism 5, as shown in fig. 5 (a) and 5 (b). The slurry box comprises guide rails 501 arranged at two opposite side edges of the slurry box 303 and at the bottom of the slurry box, and a group of adjusting plates 502 which can slide on the guide rails in parallel with the direction of the through grooves of the pole pieces, wherein the adjusting plates 502 slide on the guide rails to adjust the size of the pole pieces which are left white, and the slurry is positioned between the group of adjusting plates. The adjusting plate is provided with a pole piece clamping groove 504, and the blank part of the edge of the pole piece can pass through the pole piece clamping groove 504, but the slurry can not leak to the outside of the adjusting plate from the pole piece clamping groove.
The embodiments of the present invention are not intended to limit the present invention. Any person skilled in the art can make many possible variations and modifications to the technical solution of the present invention or modifications to equivalent embodiments using the methods and technical contents disclosed above, without departing from the scope of the technical solution of the present invention. Therefore, any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.
Claims (13)
1. The utility model provides an electrode slice slurry coating process which characterized in that, a plurality of pole pieces that pass through the pretreatment simultaneously top-down through a plurality of scraper slits of slurry box bottom of slurry coating device under guiding mechanism's effect, the bottom of slurry box is equipped with a plurality of pole piece through slots and supplies a plurality of pole pieces to pass through, the slurry box includes the guide rail that sets up in this slurry box opposite both sides edge and slurry box bottom to and can follow the parallel sliding of pole piece through slot direction a set of regulating plate on the guide rail, the regulating plate is through sliding on the guide rail in order to adjust the size that the pole piece stays white, be equipped with the pole piece draw-in groove on the regulating plate, the blank portion at pole piece edge passes through the pole piece draw-in groove, but the thick liquids can not leak by the pole piece draw-in groove to the regulating plate outside to form a plurality of pole pieces simultaneously, be equipped with electrode slurry in the slurry box, through controlling the scraper slit of slurry box bottom for the pole piece after passing through electrode slurry in the slurry box, one side or both sides of every pole piece can scribble the same or different electrode layer.
2. The electrode plate slurry hanging process according to claim 1, wherein the electrode plates are arranged in a slurry box, the slurry box is divided into a plurality of areas, and the same electrode slurry is arranged in the areas, so that electrode layers on two sides of the electrode plate are completely the same after slurry hanging; different electrode slurries are arranged in the area, so that electrode layers on two sides of the electrode plate are different after slurry coating; or, the electrode paste can be arranged on one side of the areas on two sides of the pole piece, and the electrode paste is not arranged on the other side of the areas, so that only one side of the pole piece is provided with the electrode layer after paste hanging.
3. The electrode sheet slurry coating process according to claim 1, wherein the electrode slurry is an aqueous slurry comprising a slurry with deionized water as a dispersion medium; or the electrode slurry is an oil slurry, and comprises slurry with N-methyl pyrrolidone organic solvent as a dispersion medium; alternatively, the electrode paste is an electrolyte system, and includes a mixed solvent of an ether solvent and a carbonate solvent, or a mixed solvent of two or more ether solvents.
4. The electrode sheet slurry coating process according to claim 1, wherein each two adjacent electrode sheets or each adjacent electrode sheets subjected to slurry coating are attached to form a composite electrode sheet with a sandwich composite structure layer under the action of a guide mechanism inside the slurry box or outside the slurry box.
5. The electrode sheet sizing process of any one of claims 1-4, wherein the sizing process comprises the steps of:
s1: electrode slurry is prepared: electrode slurry is prepared according to the proportion as required;
s2: pole piece pretreatment: carrying out primary slurry coating and/or setting a white part on the pole piece;
s3: placing a pole piece: the pole piece pretreated in the step S2 is subjected to constant tension, deviation adjustment and shaping, and sequentially passes through the top of the slurry box from top to bottom through a guide mechanism and enters a scraper slit at the bottom of the slurry box, so that the pole piece is in a tensioned and flat state under the action of the constant tension;
s4: injecting electrode slurry: injecting the same or different electrode slurries into two sides of the pole piece in the slurry box according to the requirement;
s5: hanging slurry: electrode slices in the slurry box sequentially pass through the top of the slurry box and the scraper slits at the bottom of the slurry box from top to bottom under the action of the transmission mechanism, electrode slurries at two sides of the electrode slices in the slurry box are dipped and coated on two sides of the electrode slices, and then redundant attached slurries are scraped off by the scraper at the bottom of the slurry box to form electrode slices with flat surfaces and uniform thickness;
s6: and (3) rolling: and the electrode plate after the slurry coating is dried and is used as a battery electrode plate for standby.
6. The electrode sheet sizing process of claim 5, further comprising the steps of, between steps S5 and S6:
composite electrode sheet: and each two or each adjacent plurality of electrode plates are attached together to form the composite electrode plate with the sandwich composite structure layer by the action of the guide mechanism inside the slurry box or outside the slurry box.
7. The electrode sheet sizing process of claim 5, further comprising the steps of, between steps S5 and S6:
spray humidification: when a solvent slurry system with high viscosity and easy volatilization is adopted, the solvent spraying and humidifying process is increased in order to prevent dry material blockage caused by solvent volatilization in the slurry near the discharge port of the scraper.
8. A slurry hanging device for implementing the electrode sheet slurry hanging process according to any one of claims 1-7, characterized in that the slurry hanging device comprises a guide mechanism, at least one slurry box and a coating mechanism positioned at the bottom of the slurry box, wherein a plurality of through slots for pole pieces are arranged at the bottom of the slurry box for passing through, the slurry box comprises guide rails arranged at two opposite side edges of the slurry box and the bottom of the slurry box, a group of adjusting plates capable of sliding on the guide rails in parallel with the through slots of the pole pieces, the adjusting plates slide on the guide rails to adjust the size of the pole pieces for leaving white, the adjusting plates are provided with pole piece clamping slots, the white part of the edge of the pole pieces passes through the pole piece clamping slots, but slurry cannot leak to the outside of the adjusting plates from the pole piece clamping slots, a pole piece inlet of the slurry box is positioned at the upper part of the through slots of the pole pieces, the pole pieces sequentially pass through the through slots of the pole pieces inlet and the bottom of the slurry box and the coating mechanism from top to bottom, and the plurality of pole pieces are arranged in the slurry box to form two areas above the slurry box.
9. The battery pole piece slurry coating device according to claim 8, wherein a guiding mechanism is arranged in the slurry box, the guiding mechanism guides more than two pole pieces entering the slurry box at the same time to the same pole piece through groove at the bottom of the slurry box, and the more than two pole pieces are combined into a composite pole piece.
10. The battery pole piece slurry coating device according to claim 8, wherein a guiding mechanism is arranged outside the slurry box, and guides the more than two electrode pieces to be led out from a pole piece inlet of the slurry box to different pole piece through grooves at the bottom of the slurry box and then are combined into a composite electrode piece.
11. The battery pole piece slurry coating device of claim 8, wherein one or more baffles are arranged in the slurry box to divide the slurry box into different areas, the pole piece moves along the baffles from a pole piece inlet of the slurry box to a pole piece through groove at the bottom of the slurry box, and the baffles support and guide the pole piece.
12. A battery pole piece sizing device as recited in claim 8, wherein the coating mechanism comprises a sizing device at the bottom of a sizing box, the sizing device is a pair of scrapers or squeeze rollers or a combination of the two, which are movably adjustable along a direction perpendicular to the pole piece movement direction, and the size of the gap of a pole piece through slot at the bottom of the sizing box can be controlled by adjusting the sizing device, so as to control the thickness of sizing layers at two sides of the pole piece.
13. The battery pole piece slurry coating device according to claim 12, wherein the slurry coating device is connected with the slurry box through a fixing plate, and an opening power supply pole piece is arranged on the fixing plate at a position corresponding to a pole piece through groove at the bottom of the slurry box and passes through the slurry coating device.
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