CN114914387A - Electrode plate slurry coating process and slurry coating device - Google Patents
Electrode plate slurry coating process and slurry coating device Download PDFInfo
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- CN114914387A CN114914387A CN202110181703.9A CN202110181703A CN114914387A CN 114914387 A CN114914387 A CN 114914387A CN 202110181703 A CN202110181703 A CN 202110181703A CN 114914387 A CN114914387 A CN 114914387A
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 230000008569 process Effects 0.000 title claims abstract description 32
- 238000007581 slurry coating method Methods 0.000 title claims description 38
- 239000002002 slurry Substances 0.000 claims abstract description 301
- 230000007246 mechanism Effects 0.000 claims description 72
- 239000011267 electrode slurry Substances 0.000 claims description 38
- 238000000576 coating method Methods 0.000 claims description 29
- 239000011248 coating agent Substances 0.000 claims description 28
- 230000009471 action Effects 0.000 claims description 23
- 239000002131 composite material Substances 0.000 claims description 22
- 238000007790 scraping Methods 0.000 claims description 21
- 239000002904 solvent Substances 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 11
- 238000004513 sizing Methods 0.000 claims description 8
- 238000005192 partition Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- 239000012046 mixed solvent Substances 0.000 claims description 4
- 239000003960 organic solvent Substances 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 4
- 239000003792 electrolyte Substances 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
- 150000001875 compounds Chemical class 0.000 claims description 2
- 239000008367 deionised water Substances 0.000 claims description 2
- 229910021641 deionized water Inorganic materials 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims description 2
- 239000004210 ether based solvent Substances 0.000 claims description 2
- 238000007493 shaping process Methods 0.000 claims description 2
- 238000004804 winding Methods 0.000 claims description 2
- 238000011031 large-scale manufacturing process Methods 0.000 abstract description 2
- 238000013329 compounding Methods 0.000 description 9
- 239000007788 liquid Substances 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000004048 modification Effects 0.000 description 6
- 238000012986 modification Methods 0.000 description 6
- 239000007921 spray Substances 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000007772 electrode material Substances 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000006255 coating slurry Substances 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 239000000203 mixture 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
- 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
- 229910000019 calcium carbonate Inorganic materials 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
- 238000005520 cutting process Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000002003 electrode paste 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
- 238000000465 moulding Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004537 pulping Methods 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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 slurry drawing mode of the electrode plate from bottom to top in the prior art, the slurry drawing mode of the electrode plate from top to bottom in slurry drawing is more suitable for preparing a thick electrode. The invention also provides a slurry hanging device capable of realizing the slurry hanging process, wherein the slurry hanging device can be simultaneously provided with a plurality of slurry boxes, or the bottom of each slurry box can be provided with a plurality of pole piece through grooves, and a plurality of electrode plates can be simultaneously subjected to slurry hanging, so that the slurry hanging efficiency is improved. Therefore, the method can be used for continuously, efficiently and inexpensively preparing the super-thick electrode plate and realizing the large-scale production of the super-thick electrode plate.
Description
Technical Field
The invention relates to the field of batteries, in particular to a sizing process and a sizing device for battery pole pieces.
Background
In the existing manufacturing process of battery pole pieces, a lithium ion battery adopts a precise coating-rolling-slitting process, a lead-acid battery adopts a slurry drawing/coating-drying-die cutting process for part of the lead-acid battery, the thickness of an 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, secondary coating forming is needed when the electrode plate coated on two sides is prepared by adopting a precise coating method, the process is complex, the preparation efficiency is low, and the cost is high.
Disclosure of Invention
Aiming at the problems, the invention provides a battery pole piece slurry coating process, compared with the slurry coating mode of the electrode plate from bottom to top during slurry coating in the prior art, the slurry coating mode of the electrode plate from top to bottom during slurry coating is more suitable for preparing a thick electrode. The invention also provides a slurry hanging device capable of realizing the slurry hanging process, the slurry hanging device can be simultaneously provided with a plurality of slurry boxes, or the bottom of each slurry box can be provided with a plurality of pole piece through grooves, and a plurality of pole pieces can be simultaneously subjected to slurry hanging, so that the slurry hanging efficiency is improved. Therefore, the method can be used for continuously, efficiently and inexpensively preparing the super-thick electrode plate and realizing the large-scale production of the super-thick electrode plate.
The technical scheme provided by the invention is as follows:
the invention provides an electrode plate slurry coating 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 coating device from top to bottom under the action of a guide mechanism, electrode slurry 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 to form an electrode plate by controlling the scraper slits at the bottom of the slurry box.
The pole piece can be a porous current collector substrate and comprises porous conductive materials such as porous aluminum foil, porous copper foil, copper mesh and stainless steel mesh.
In the traditional slurry drawing process, the slurry drawing direction of the electrode plates is from bottom to top, the slurry drawing process is not suitable for the condition that the slurry layer is thick, because when the slurry layer is thick, the slurry layer can fall off under the action of self weight and then passes through the scraper, and the slurry layer becomes thin at the moment. When the battery pole piece is pasted, the pole piece moves from top to bottom, the scraper opening is positioned at the bottom of the slurry box, the pole piece firstly passes through the scraper opening, 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 high, the phenomenon that the slurry falls off cannot occur.
One or more pole pieces are arranged in the slurry box, the slurry box is divided into a plurality of areas, and the same electrode slurry can be arranged in the areas according to different requirements, so that electrode layers on two sides of the electrode pieces after slurry hanging are completely the same; different electrode slurry can be arranged, so that the electrode layers on the two sides of the electrode slice are different after slurry coating; or, the electrode slurry is arranged on one side of the areas on the two sides of the pole piece, and the electrode slurry is not arranged on the other side of the areas on the two sides of the pole piece, so that the electrode layer is arranged on only one side of the electrode plate after slurry hanging.
According to the invention, the components and/or proportions of the sizing agents on the two sides of the pole piece in the sizing agent box are the same or different: the electrode slurry can be water-based slurry, including slurry taking deionized water as a dispersion medium; the electrode slurry may be oil-based slurry, including slurry using an organic solvent such as N-methylpyrrolidone as a dispersion medium; the electrode slurry can be an electrolyte system and comprises a mixed solvent of an ether solvent and a carbonate solvent or a mixed solvent consisting of two or more ether solvents; the electrode slurry may also be other battery systems, such as sodium ion battery slurries, and include other non-battery industry slurries (e.g., solid-liquid mixtures, such as a mixture of PVC and calcium carbonate). The coating of different materials on the surface of the sizing base material can be realized at one time by the arrangement so as to play different roles, and the one-time composite molding of the electrode plates with different structures can be realized by combining the electrode plate compounding step after the coating is combined.
According to the electrode plate slurry coating process, only one electrode plate can be subjected to slurry coating from top to bottom at a time to obtain one electrode plate as required, and also in order to improve the production efficiency, a plurality of electrode plates are subjected to slurry coating at the same time to obtain a plurality of electrode plates, and when the plurality of electrode plates are subjected to slurry coating at the same time, a plurality of slurry boxes need to be configured or the bottom of one slurry box is provided with a plurality of scraper slits.
Further, in the invention, under the action of a guide mechanism inside or outside the slurry box, every two or every several adjacent electrode plates after slurry hanging can be attached to form the composite electrode plate with the sandwich composite structure layer.
In the invention, the pole piece can be pretreated, and the pretreatment process comprises primary slurry coating and pole piece margin setting. The first slurry coating refers to that slurry coating is carried out in advance after the surface of the pole piece is pretreated to form a thin electrode layer, so that the bonding property between a current collector and an electrode material is improved conveniently; the setting of the pole piece blank refers to setting blank parts on two sides of the pole piece, wherein the blank parts are obtained by adopting a mode of sticking adhesive tapes on the edges of two sides of the pole piece or setting a pole piece blank mechanism in a slurry box.
The electrode slice slurry coating process comprises the following steps:
s1: preparing electrode slurry: preparing electrode slurry according to a proportion according to the requirement;
s2: pole piece pretreatment: carrying out primary slurry coating and/or setting a blank part for pretreatment on the pole piece;
s3: placing a pole piece: after the pole piece pretreated in the step S2 is subjected to constant tension, deviation adjustment and shaping, the pole piece 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 slurry into two sides of the pole piece in the slurry box according to the requirement;
s5: coating slurry: under the action of a transmission mechanism, the pole pieces in the slurry box sequentially pass through the scraper slits on the top of the slurry box and the bottom of the slurry box from top to bottom, electrode slurry on two sides of the pole pieces in the slurry box is soaked and stained and is hung and coated on two sides of the pole pieces, and then redundant attached slurry is scraped off by a scraper on the bottom of the slurry box to form the electrode piece with a flat surface and uniform thickness;
s6: winding: and drying the electrode plate subjected to slurry coating to obtain the battery electrode plate for later use.
Further, the steps S5 and S6 include the following steps:
a composite electrode plate: every two or every two adjacent electrode plates are jointed together inside the slurry box or outside the slurry box through the action of a guide mechanism to form the composite electrode plate with the sandwich composite structure layer.
Further, the steps S5 and S6 include the following steps:
spraying and humidifying: when a volatile high-viscosity solvent slurry system is adopted, in order to prevent dry material blockage caused by solvent volatilization in the slurry near the discharge port of the scraper, a solvent spraying humidification process is added.
According to the invention, the composite electrode plate can be compounded in a plurality of different ways:
in some embodiments, the slurry hanging device is provided with a slurry box, the bottom of the slurry box is provided with a pole piece through groove, the guide mechanism is positioned inside the slurry box, and the plurality of pole pieces are guided inside the slurry box to simultaneously pass through the pole piece through groove at the bottom of 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, the bottom of each slurry box is provided with a pole piece through groove, and a plurality of pole pieces are compounded to form an electrode piece under the action of a guide mechanism after passing through a coating mechanism at the bottom of each slurry box respectively. 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 pole piece through grooves, and a plurality of pole pieces are compounded to form an electrode plate under the action of a guide mechanism after passing through a coating mechanism at the bottom of the slurry box respectively. The guiding mechanism is positioned outside the slurry box.
The invention also provides an electrode plate slurry coating 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 pole piece through grooves are formed in the bottom of the slurry box and used for one or more pole pieces to pass through, a pole piece inlet of the slurry box is positioned at the upper part of the pole piece through groove, and a pretreated pole piece sequentially passes through the pole piece inlet of the slurry box, the pole piece through groove in the bottom of the slurry box and the coating mechanism from top to bottom to obtain the electrode plate with controllable slurry layer thickness and smooth and uniform surface.
The slurry hanging device can be simultaneously provided with a plurality of slurry boxes, or the bottom of each slurry box can be provided with a plurality of pole piece through grooves, and a plurality of pole pieces can be hung with slurry at the same time, so that the slurry hanging efficiency is improved.
Preferably, the slurry box can be a U-shaped material box with a pole piece through groove at the bottom, and the pole piece inlet is an upper top opening of the slurry box; furthermore, a top cover is arranged at the top of the slurry box to prevent dust or other foreign matters from falling into the slurry box, and the pole piece inlet can be arranged on the top cover.
Or, the slurry box can also be a U-shaped slurry box with a pole piece through groove at the bottom formed by a group of oppositely arranged modules through mechanical fixation or adhesion fixation.
It should be noted that the shape of the slurry box is not limited to a U shape, and any shape can be used for fixing the slurry and realizing the slurry hanging action of the pole piece.
The material of the slurry box is organic solvent resistant and has certain strength, such as stainless steel, polytetrafluoroethylene and other organic solvent resistant high molecular polymer materials.
The bottom end of the slurry box can be provided with a spray humidifying mechanism, when a volatile high-viscosity solvent slurry system is adopted, in order to prevent dry material blockage caused by solvent volatilization in the slurry near the discharge port of the scraper and increase the humidification process of the solvent spray, the solvent spray humidifying mechanism can be a fine spray nozzle connected with a solvent storage bottle and can be arranged on one side or two sides of the slurry tank.
The surface of the slurry box can be provided with a constant-temperature water jacket or an oil jacket to ensure that slurry hanging slurry is at a constant temperature and prevent the change of the states of the slurry such as viscosity and the like caused by overhigh or overlow temperature.
The two sides of the pole piece can be provided with a white part in the slurry hanging process, and the white part can be obtained by sticking adhesive tapes on the two side edges of the pole piece or arranging a pole piece white mechanism inside the slurry box.
Further, the inside of thick liquids box is equipped with the pole piece and leaves white mechanism, including setting up the guide rail in thick liquids box both sides edge and thick liquids box bottom to and can follow a set of regulating plate with the parallel gliding of pole piece logical groove direction on the guide rail, the regulating plate is through sliding on the guide rail and leaving white size in order to adjust the pole piece, and thick liquids are located between a set of regulating plate. The adjusting plate is provided with a pole piece clamping groove, the blank part at the edge of the pole piece can pass through the clamping groove, but slurry cannot leak to the outside of the adjusting plate through the clamping groove. The pole piece clamping groove can be formed by oppositely arranging a group of contact pieces with smooth surfaces, wear resistance and electrolyte corrosion resistance, and the gap of the pole piece clamping groove is 0-2 mm. The pole piece clamping groove is arranged between the pole piece inlet of the slurry box and the pole piece through groove at the bottom of the slurry box, and plays roles of reserving white, supporting and guiding the pole piece. Preferably, the guide rail is provided with scales so as to accurately adjust the size of the pole piece margin.
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 slurry scraping device, a side plate used for installing the slurry scraping device and another side plate vertically and fixedly connected with the two ends of the side plate. The side plates are 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 the gap of the slurry scraping device is adjusted by adjusting the adjusting mechanism on the side plates, so that the size of the gap of the pole piece through groove at the bottom of the slurry box is adjusted.
The slurry scraping device is a pair of scrapers or squeezing rollers or a combination of the scrapers and the squeezing rollers, which can be movably adjusted along the direction vertical to the movement direction of the pole pieces, and the size of the gap of the pole piece through groove at the bottom of the slurry box can be controlled by adjusting the slurry scraping device, so that the thickness of the slurry layers at two sides of the pole piece can be controlled.
The size of the through groove of the pole piece at the bottom of the slurry box can be controlled by adjusting the slurry scraping device by using a micrometer head, an adjusting bolt and the like and matching with a clearance gauge, so that the thickness of slurry layers on 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 is coated with slurry from top to bottom under the action of the guide mechanism, and the electrode plate with the flat and uniform surface and controllable thickness of the slurry layer is obtained under the action of the 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 the bottom of each slurry box is provided with one or more pole piece through grooves.
When being equipped with a plurality of thick liquids box or thick liquids box bottom is equipped with a plurality of pole pieces and leads to the groove, can carry out the coating simultaneously by a plurality of electrode slices to improve production efficiency.
When the bottom of the slurry box is provided with a pole piece through groove, one pole piece divides the slurry box into two areas in the slurry box; when the bottom of the slurry box is provided with the through grooves for the plurality of electrode plates, the slurry box is divided into a plurality of areas by the plurality of electrode plates in the slurry box.
Electrode slurry with completely the same components and proportion is filled in the different areas of the slurry box, so that the slurry layers on the two sides of the pole piece are completely the same; or, electrode slurry with different components and/or proportions is filled 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 the different areas in the slurry box is not filled with slurry, so that a slurry layer is arranged on one side of the pole piece.
Preferably, a partition board 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 partition board is made of any one of stainless steel materials or polymer materials which have certain strength and are convenient to cut, such as a stainless steel plate, an acrylic plate, a polytetrafluoroethylene plate and the like.
Compared with the prior art, the slurry box is divided into a plurality of areas, different slurries can be arranged in different areas, so that the technical effect that the slurries on two sides of the pole piece are different is achieved, and the effect that the slurry is hung on one side of the pole piece can be achieved without any slurry in one area. The slurry referred to herein may be different in the components of the slurry or may be different in the solid content of the slurry.
In some embodiments, the electrode layer on one side of the electrode sheet may be a surface base 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 an active material-containing lithium iron phosphate slurry layer. The carbon-coated modified layer can change the current collecting effect of the surface of the pole piece and reduce the polarization performance of the battery, and the functional material modified layer is a main energy donor, and the functional material modified layer are completed simultaneously, 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 plate more accurately, a group of positioning deviation rectifying rollers are arranged below the coating mechanism, and the positioning deviation rectifying rollers and the guide mechanism are guided together to rectify the deviation of the electrode plate, so that the thickness of the slurry layer on the two sides of the electrode plate is more accurate. A group of positioning deviation-rectifying rollers are oppositely arranged below the coating mechanism, and the electrode plates pass between the positioning deviation-rectifying rollers.
And (4) the electrode slice after slurry hanging enters an oven, and is dried and then cut or wound for standby.
The invention has the advantages that:
1) when slurry is coated, battery pole pieces sequentially pass 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 from top to bottom, and compared with a mode of coating slurry from bottom to top in the traditional slurry coating process, the slurry coating process from top to bottom is suitable for preparing electrode pieces with thicker slurry layers;
2) the slurry hanging device is provided with at least one slurry box, wherein the bottom of the slurry box is provided with one or more pole piece through grooves for one or more pole pieces to pass through, so that the slurry hanging efficiency can be improved on one hand, and on the other hand, the pole pieces can be compounded under the action of the guide mechanism to form a battery pair or a battery pack, so that the production and assembly efficiency of the battery is improved;
3) the slurry box is divided into different areas, and electrode slurries with the same or different components and proportions are filled in the different areas, so that the slurry layers on the two sides of the pole piece are the same or different; or one side of the slurry box is not provided with slurry, so that the electrode plate with slurry hung on one side is obtained; the multiple slurry hanging forms are flexible, and different electrode plate requirements are met.
Drawings
FIG. 1 is a schematic view of a pulping process according to the invention;
2(a) -2 (d) are schematic views of an embodiment of the composite electrode sheet in the coating according to the invention;
FIG. 3 is a schematic view of the overall structure of the slurry coating device according to the present invention;
FIG. 4 is a schematic view of a coating mechanism in the coating apparatus according to the present invention;
fig. 5(a) -5 (b) are schematic structural views of a white leaving mechanism arranged in a pulp box in the pulp hanging device according to the invention.
List of reference numerals
101-pole piece
102-electrode paste
103-scraper
104-doctor slit
105-electrode slice
201-electrode sheet combination mode one
202-electrode plate compounding mode II
203-electrode plate combination mode III
204-electrode plate compounding mode four
205-composite electrode slice
301-guide 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 leaving mechanism
501-guide rail
502-regulating plate
503-contact member
504-pole piece slot
Detailed Description
The invention will be further illustrated by the following examples in conjunction with the accompanying drawings.
A slurry coating process for an electrode plate is disclosed, as shown in figure 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 plate passes 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 that an electrode plate 105 is formed.
In the invention, in order to improve the production efficiency or obtain the composite electrode plate, a plurality of electrode plates can simultaneously pass through one or more scraper slits at the bottom of the slurry coating 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 refers to 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 through the action of a guide mechanism.
The composite electrode plate can have a plurality of different composite modes:
the first electrode plate compounding mode is 201, the slurry hanging device is provided with a slurry box, the bottom of the slurry box is provided with a plurality of pole piece through grooves, and a plurality of pole pieces are compounded to form an electrode plate under the action of a guide mechanism after passing through a coating mechanism at the bottom of the slurry box respectively. The guiding mechanism is positioned outside the slurry box. As shown in fig. 2 (a).
And in the second electrode plate compounding mode 202, the slurry hanging device is provided with a slurry box, the bottom of the slurry box is provided with a pole piece through groove, and the guide mechanism is positioned inside the slurry box and guides a plurality of pole pieces to pass through the through groove of the pole piece at the bottom of the slurry box simultaneously in the inner part of the slurry box so as to complete pole piece compounding. As shown in fig. 2 (b).
And in the third electrode plate compounding mode 203, the slurry hanging device is provided with a plurality of slurry boxes, the bottom of each slurry box is provided with a pole piece through groove, and a plurality of pole pieces are compounded to form an electrode plate under the action of a guide mechanism after passing through the coating mechanism at the bottom of each slurry box respectively. The guiding mechanism is positioned outside the slurry box. As shown in fig. 2 (c).
And in the fourth electrode plate compounding mode 204, the slurry hanging device is provided with a plurality of slurry boxes, a pole piece through groove is formed in the bottom of each slurry box, and a plurality of pole pieces are compounded to form the compound electrode plate 205 under the action of a guide mechanism after passing through the coating mechanism at the bottom of each slurry box respectively. The guiding mechanism is positioned outside the slurry box. As shown in fig. 2 (d).
The plurality of pole pieces are arranged in the slurry box, so that the slurry box is divided into a plurality of areas, as shown in fig. 2(a), in the embodiment, the slurry box can be divided into A, B, C three areas by two pole pieces, and the same electrode slurry can be arranged in the areas according to different requirements, so that the electrode layers on the two sides of the electrode pieces after slurry hanging are completely the same; different electrode slurry can be arranged, so that the electrode layers on the two sides of the electrode slice are different after slurry coating; or, the electrode slurry can be arranged on one side of the areas on the two sides of the pole piece, and the electrode slurry is not arranged on the other side of the areas on the two sides of the pole piece, so that the electrode layer is arranged on only one side of the electrode piece after slurry hanging.
As shown in fig. 3, the electrode plate slurry coating device of the present invention includes a guiding mechanism 301, at least one slurry box 303, and a coating mechanism 304 located at the bottom of the slurry box, wherein the bottom of the slurry box 303 is provided with one or more pole piece through grooves 403 for one or more pole pieces 101 to pass through, a pole piece inlet of the slurry box 303 is located at the upper portion of the pole piece through groove 403, and the pre-treated pole piece 101 sequentially passes through the pole piece inlet of the slurry box, the pole piece through groove 403 at the bottom of the slurry box, and the coating mechanism 304 from top to bottom, so as to obtain an electrode plate 104 with a controllable slurry layer thickness and a flat and uniform surface.
As shown in FIG. 4, the bottom of the slurry box of 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 slurry scraping device, a side plate 404 for mounting the slurry 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 size of the gap of the slurry scraping device is adjusted by adjusting the adjusting mechanism 402 on the side plate 404, so that the size of the gap of the pole piece through groove 403 at the bottom of the slurry box 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 blank leaving mechanism 5, as shown in fig. 5(a) and 5 (b). The slurry box comprises guide rails 501 arranged on the edges of two opposite sides of a slurry box 303 and 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 a through groove of a pole piece, wherein the adjusting plates 502 can slide on the guide rails to adjust the size of the pole piece blank, and the slurry is positioned between the group of adjusting plates. The adjusting plate is provided with a pole piece clamping groove 504, the margin 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 specific embodiments of the present invention are not intended to be limiting of the invention. Those skilled in the art can make numerous possible variations and modifications to the present invention, or modify equivalent embodiments, using the means and techniques disclosed above, without departing from the scope of the invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are within the scope of the technical solution of the present invention, unless the technical essence of the present invention is not departed from the content of the technical solution of the present invention.
Claims (13)
1. The electrode plate slurry coating process is characterized in that one or more pretreated electrode plates simultaneously pass through one or more scraper slits 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 is arranged in the slurry box, and one side or two sides of each electrode plate can be coated with the same or different electrode layers to form an electrode plate 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.
2. The electrode slice sizing process according to claim 1, wherein the one or more electrode slices are in the slurry box, the slurry box is divided into a plurality of areas, and the same electrode slurry is arranged in the areas, so that the electrode layers on the two sides of the electrode slices after sizing are completely the same; different electrode slurry is arranged in the area, so that electrode layers on two sides of the electrode slice are different after slurry coating; or, the electrode slurry can be arranged on one side of the areas on the two sides of the pole piece, and the electrode slurry is not arranged on the other side of the areas on the two sides of the pole piece, so that the electrode plate is only provided with an electrode layer on one side after slurry hanging.
3. An electrode sheet sizing process according to claim 1 or 2, wherein the electrode slurry is a water-based slurry comprising a slurry using deionized water as a dispersion medium; or the electrode slurry is oil-based slurry and comprises slurry taking N-methyl pyrrolidone organic solvent as a dispersion medium; or the electrode slurry is an electrolyte system and comprises a mixed solvent of an ether solvent and a carbonate solvent or a mixed solvent consisting of two or more ether solvents.
4. The electrode sheet pasting process of claim 1, wherein every two or every several adjacent pasted electrode sheets are attached to form a composite electrode sheet with a sandwich composite structure layer under the action of a guide mechanism inside or outside the slurry box.
5. Electrode pad pasting process according to any one of claims 1-4, characterized in that the pasting process comprises the following steps:
s1: preparing electrode slurry: preparing electrode slurry according to a proportion according to the requirement;
s2: pole piece pretreatment: carrying out primary slurry coating and/or setting a white part on the pole piece;
s3: placing a pole piece: after the pole piece pretreated in the step S2 is subjected to constant tension, deviation adjustment and shaping, the pole piece 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 constant tension;
s4: injecting electrode slurry: injecting the same or different electrode slurry into two sides of the pole piece in the slurry box according to the requirement;
s5: slurry coating: under the action of a transmission mechanism, the pole pieces in the slurry box sequentially pass through the scraper slits on the top of the slurry box and the bottom of the slurry box from top to bottom, electrode slurry on two sides of the pole pieces in the slurry box is soaked and stained and is hung and coated on two sides of the pole pieces, and then redundant attached slurry is scraped off by a scraper on the bottom of the slurry box to form the electrode piece with a flat surface and uniform thickness;
s6: winding: and drying the electrode plate subjected to slurry coating to be used as a battery pole piece for later use.
6. The electrode sheet pasting process as claimed in claim 5, further comprising the following steps between the steps S5 and S6:
compound electrode slice: every two or every two adjacent electrode plates are jointed together inside the slurry box or outside the slurry box through the action of a guide mechanism to form the composite electrode plate with the sandwich composite structure layer.
7. The electrode sheet pasting process as claimed in claim 5, further comprising the following steps between the steps S5 and S6:
spraying and humidifying: when a volatile high-viscosity solvent slurry system is adopted, in order to prevent dry material blockage caused by solvent volatilization in the slurry near the discharge port of the scraper, a solvent spraying humidification process is added.
8. A slurry hanging device for implementing the slurry hanging process of the electrode plate according to any one of claims 1 to 7, wherein 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, 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, a pole piece inlet of the slurry box is positioned at the upper part of the pole piece through groove, the pole pieces sequentially pass through the pole piece inlet of the slurry box, the pole piece through groove in the bottom of the slurry box and the coating mechanism from top to bottom, and the one or more pole pieces divide the slurry box into more than two areas in the slurry box.
9. The battery pole piece slurry hanging device according to claim 8, wherein a guiding mechanism is arranged in the slurry box, the guiding mechanism guides more than two electrode pieces which enter the slurry box simultaneously to the same pole piece through groove at the bottom of the slurry box, and the more than two electrode pieces are compounded into a composite electrode piece.
10. The battery pole piece slurry coating device according to claim 8, wherein a guide mechanism is arranged outside the slurry box, and the guide mechanism guides the more than two electrode pieces from the pole piece inlet of the slurry box to different pole piece through grooves at the bottom of the slurry box, and then the electrode pieces are led out and compounded into a composite electrode piece.
11. The battery pole piece slurry hanging device according to claim 8, wherein one or more partition plates are arranged in the slurry box to divide the slurry box into different areas, the pole pieces move along the partition plates from a pole piece inlet of the slurry box to a pole piece through groove at the bottom of the slurry box, and the partition plates support and guide the pole pieces.
12. The battery pole piece slurry hanging device according to claim 8, wherein the coating mechanism comprises a slurry scraping device at the bottom of the slurry box, the slurry scraping device is a pair of scraper blades or a pair of squeezing rollers or a combination of the scraper blades and the squeezing rollers, the scraper blades and the squeezing rollers can be movably adjusted along the direction perpendicular to the movement direction of the pole piece, and the size of the gap of the pole piece through groove at the bottom of the slurry box can be controlled by adjusting the slurry scraping device, so that the thickness of the slurry layer at two sides of the pole piece can be controlled.
13. The battery pole piece slurry hanging device according to claim 11, wherein the slurry scraping device is connected with the slurry box through a fixing plate, and an opening is formed in the fixing plate corresponding to the pole piece through groove at the bottom of the slurry box for an electrode piece to pass through the slurry scraping device.
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