A positive electrode coating method and coating equipment for all-solid-state battery

Abstract

The invention discloses a positive electrode coating method and coating equipment for an all-solid-state battery, comprising the following steps: step S1: raw material preparation, taking by weight 65-70 parts of high-nickel ternary, 23-28 parts of sulfide electrolyte, 3-6 parts of conductive agent, 3-3.5 parts of PTFE polytetrafluoroethylene emulsion, 55 parts of toluene, and 0.4-0.6 parts of oleic acid; step S2: pretreatment, vacuum drying the high-nickel ternary at 120°C for 12 hours, crushing and sieving the sulfide electrolyte, mixing the conductive agent by ball milling for 1 hour, diluting the PTFE polytetrafluoroethylene emulsion to a concentration of 20%, dehydrating the toluene to a content of less than 10ppm through molecular sieves, and pre-dissolving oleic acid in toluene; the invention relates to the technical field of all-solid-state batteries, forming a hydrophobic protective layer through pre-dehydration treatment and oleic acid pre-dissolution technology, inhibiting the interfacial reaction between the sulfide and the high-nickel ternary, adopting a step-by-step feeding strategy to avoid mechanical damage to the active material and maintain the integrity of the crystal structure, gradient dilution and dropwise addition of the PTFE polytetrafluoroethylene emulsion to prevent local micelle aggregation, and improving the uniformity of electrode bonding.

Description

Technical Field

[0001] The present invention relates to the technical field of all-solid-state batteries, and in particular to a positive electrode coating method and coating equipment for an all-solid-state battery. Background Art

[0002] All-solid-state batteries have higher energy density and safer performance. They use solid electrolytes instead of traditional liquid electrolytes, which makes them more stable than liquid lithium batteries in theory and have a longer service life.

[0003] Because all-solid-state batteries use non-flammable solid electrolytes, they need to coat the cathode current collector with a special mixed slurry. This slurry has high viscosity and easy sedimentation characteristics. However, the preparation and coating of the cathode slurry face severe challenges. Sulfide electrolytes are extremely sensitive to moisture and oxygen, and are prone to interfacial side reactions with high-nickel ternary materials, resulting in battery performance degradation. In traditional wet methods, sulfide particles are prone to agglomeration, the conductive agent is unevenly distributed, and the PTFE polytetrafluoroethylene emulsion binder is prone to forming fiber bundles due to excessive local concentration, reducing the mechanical strength of the electrode. At the same time, residual organic solvents will trigger sulfide decomposition, requiring strict dehydration, but existing methods make it difficult to accurately control the solvent purity.

[0004] During the transportation process, the slurry of traditional wet coating equipment undergoes phase separation due to the difference in solid phase particle density, resulting in dry spots or agglomeration on the coating, which greatly reduces the ion transmission efficiency. In addition, the existing coating die head relies on mechanical gaskets to adjust the width of the discharge gap. Changing battery specifications requires shutdown and disassembly. The overall operation time is long, and the rigid coating head cannot adapt to the curved surface current collector, resulting in wiredrawing defects on the edges when forced coating.

[0005] Traditional cavity-type coating heads have no dynamic stirring function, and slurry will be stratified if it stays for more than 5 minutes; and the discharge flow rate needs to be dynamically adjusted with the slurry viscosity, otherwise the high-solid content slurry will easily clog the gap. Traditional cavity-type coating heads cannot meet diverse coating needs. In view of this, for the above problems, there may already be technical means to solve them in the existing technology, but this case intends to provide an alternative or replacement technical solution. Summary of the Invention

[0006] The purpose of the present invention is to solve the above problems. A positive electrode coating method and coating equipment for all-solid-state batteries are designed to solve the problems that the existing sulfide electrolyte is sensitive to water and oxygen, and easily reacts with high-nickel materials and decomposes; in the traditional wet method, sulfides agglomerate, the conductive agent is unevenly dispersed, the PTFE polytetrafluoroethylene emulsion binder is easy to form bundles, and the solvent residue is difficult to control. During coating, the slurry phase separation causes dry spots to agglomerate, the die head needs to be shut down for adjustment, it cannot adapt to curved surfaces, and the edges are wire-drawn. The cavity-type coating head has no dynamic stirring, the slurry is easy to stratify, and the flow rate cannot be adjusted in real time according to the viscosity. The high-solid content slurry is prone to clogging.

[0007] The technical solution of the present invention to achieve the above-mentioned purpose is: a positive electrode coating method for an all-solid-state battery, comprising the following steps;

[0008] Step S1: Raw material preparation: 65-70 parts by weight of high nickel ternary electrolyte, 23-28 parts by weight of sulfide electrolyte, 3-6 parts by weight of conductive agent, 3-3.5 parts by weight of PTFE polytetrafluoroethylene emulsion, 55 parts by weight of toluene, and 0.4-0.6 parts by weight of oleic acid;

[0009] Step S2: Pretreatment: drying the high nickel ternary electrolyte at 120°C in vacuum for 12 hours, crushing and sieving the sulfide electrolyte, mixing the conductive agent by ball milling for 1 hour, diluting the PTFE polytetrafluoroethylene emulsion to a concentration of 20%, dehydrating toluene through molecular sieves to a content of less than 10 ppm, and pre-dissolving oleic acid in toluene;

[0010] Step S3: mixing toluene and oleic acid, and dispersing at 2000 rpm for 10 min;

[0011] Add sulfide electrolyte and ball mill at 500 rpm for 30 min;

[0012] Add conductive agent and stir for 20 minutes;

[0013] Add high nickel ternary metals in batches and stir at low speed for 40 minutes;

[0014] Add PTFE polytetrafluoroethylene emulsion dropwise, stir for 20 minutes and then vacuum degas. The viscosity is controlled at 8000±500 mPas.

[0015] Step S4: Aluminum foil is selected as the substrate and is mounted on a roller conveyor device with one side in contact with the coating device;

[0016] Step S5: moving the coating device to a position corresponding to the aluminum foil conveying device, and fixing the bottom plate to support the whole device;

[0017] Step S6: connecting the feed pipe to the slurry conveying equipment and the air supply pipe to the gas pressurizing equipment;

[0018] Step S7: According to the width of the aluminum foil and the coating requirements, the adjusting screw is turned to push the adjusting baffle to block part of the discharge gap to match the coating width;

[0019] Step S8: retract the first electric push rod to disengage the positioning rod from the positioning gear; start the adjustment motor to drive the gear set to adjust the inclination angle of the coating frame, and reset the push rod to lock the positioning gear;

[0020] Step S9: starting the booster pump to increase the slurry flow rate, and the slurry is injected into the operating cavity of the coating frame through the feed pipe;

[0021] Step S10: If the slurry pressure is insufficient, high-pressure gas is injected into the air supply pipe to push the piston plate to move, and the compression spring is temporarily pressurized. After the pressure of the booster pump is restored, the gas is released to maintain uniform pressure;

[0022] Step S11: The stirring motor drives the driving shaft, which drives the toggle shafts on both sides of the piston plate to rotate through the chain transmission. The three stirring blades forcibly break up the slurry agglomerates to maintain uniform dispersion of solid and liquid;

[0023] Step S12: The slurry is coated onto the surface of the aluminum foil from the discharge gap;

[0024] Step S13: When the piston plate moves, the connecting rod pushes the step control plate to embed into the side of the discharge gap, changing the gap spacing to accurately control the local discharge pressure;

[0025] Step S14: After coating is completed, the material supply is stopped, the gas is released to reset the piston plate, and the spring is stretched to return to its initial state.

[0026] A positive electrode coating device for an all-solid-state battery comprises a base plate, with a coating structure mounted on the upper end of the base plate. The coating structure comprises: two support rods, two mounting shafts, a coating frame, an adjustment and positioning assembly, an operating cavity, a discharge gap, a width adjustment assembly, a feed pipe, a booster pump, a piston plate, four guide rods, four springs, an air supply pipe, a stirring assembly, and a feed control assembly.

[0027] The two support rods are respectively installed on both sides of the upper end of the base plate, and the two mounting shafts are respectively movably embedded in the two support rods through bearings. The two ends of the coating frame are respectively connected to one end of the two mounting shafts by bolts. The adjustment positioning assembly is fixedly installed on the upper end of one of the support rods, and the other end is fixedly connected to one of the mounting shafts. The operating cavity is opened in the coating frame, the discharging gap is opened on one side of the coating frame, and is connected to one side of the operating cavity. The width adjustment assembly is fixedly installed on one side of the upper end of the coating frame, and one end of the feeding pipe is embedded in the upper wall surface of the coating frame and is connected to the operating cavity. The booster pump is located between the feed pipes, the piston plate is movably embedded in the operating cavity, one end of the four guide rods is respectively connected to the four corners of one end of the piston plate, and the other ends are respectively passed through the side walls of the coating frame, the four springs are respectively movably sleeved on the upper ends of the four guide rods, and are all located outside the coating frame, the air supply pipe is located on one side of the coating frame, and one end is connected to the other end of the operating cavity, one end of the stirring assembly is movably embedded in the piston plate, and the other end is installed at the center of the side wall of the coating frame, one end of the feeding control assembly is connected to one end of the stirring assembly, and the other end is movably embedded in the discharge gap.

[0028] Preferably, the adjustment and positioning assembly includes: a positioning gear, an adjustment motor, a driving gear, a mounting frame, a first electric push rod, a plurality of slots and a positioning rod;

[0029] The positioning gear is fixedly mounted on the upper end of one of the mounting shafts, the adjusting motor is fixedly mounted on the inner wall of one of the support rods, the driving gear is fixedly mounted on the driving end of the adjusting motor, and one side is engaged with the positioning gear, the mounting frame is fixedly mounted on the top end of one of the support rods, the first electric push rod is fixedly mounted on one side of the mounting frame, a plurality of slots are evenly arranged on the side wall of the positioning gear, one end of the positioning rod is connected to the telescopic end of the first electric push rod, and the other end movably passes through the lower end of the mounting frame and is movably embedded in one of the slots.

[0030] Preferably, the width adjustment assembly includes: an adjustment frame, a plurality of fixing frames, a plurality of adjustment screws and a plurality of adjustment baffles;

[0031] The adjustment frame is fixedly embedded on one side of the upper wall of the coating frame, and several fixing frames are evenly distributed on one side of the upper end of the adjustment frame. Several adjusting screws are movably embedded in several fixing frames respectively, and the bottom ends of several adjusting baffles are movably embedded in the adjustment frame, and the top ends are movably connected to the bottom ends of several adjusting screws through bearings.

[0032] Preferably, the stirring assembly includes: a driving shaft, a transmission sleeve, two driving sprockets, two driven shafts, two driven sprockets, two chains, a stirring motor, a transmission rod and three stirring blades;

[0033] The driving shaft is embedded in the center of the piston plate through a sealed bearing, the transmission sleeve is fixedly installed on one side of the driving shaft, the two transmission sprockets are installed on the outside of the transmission sleeve, the two passive shafts are respectively embedded on both sides of the piston plate through sealed bearings, the two passive sprockets are respectively installed on one side of the upper end of the two passive shafts, one end of the two chains is movably sleeved on the upper ends of the two transmission sprockets, and the other end is movably sleeved on the upper ends of the two passive sprockets, the stirring motor is fixedly installed at the center of one side of the coating frame, the transmission rod is embedded in the wall surface of one side of the coating frame through a sealed bearing, and one end is connected to the driving end of the stirring motor, the other end of the transmission rod is movably embedded in the transmission sleeve, and the three stirring blades are respectively installed on the driving shaft and the other side of the two passive shafts.

[0034] Preferably, the feeding control assembly comprises: three guide frames, three connecting rods and a step control plate;

[0035] The bottom ends of the three guide frames are connected to the lower end of the operating cavity, the three connecting rods are movably embedded in the three guide frames, and one end is connected to the center of the three stirring blades through bearings, one end of the step control plate is connected to the other end of the three connecting rods, and the other end is movably embedded in the discharge gap.

[0036] Preferably, the inner hole of the transmission sleeve is hexagonal in shape, and the transmission rod is a hexagonal transmission rod.

[0037] Preferably, an internal thread is processed at the connection position between the fixing bracket and the adjusting screw.

[0038] Preferably, sealing guide sleeves are installed at the connection positions between the coating frame and the four guide rods.

[0039] A positive electrode coating method and coating equipment for an all-solid-state battery made using the technical solution of the present invention forms a hydrophobic protective layer through pre-dehydration treatment and oleic acid pre-dissolution technology, inhibits the interfacial reaction between sulfide and high-nickel ternary, and adopts a step-by-step feeding strategy to avoid mechanical damage to the active material and maintain the integrity of the crystal structure. The PTFE polytetrafluoroethylene emulsion is gradiently diluted and added dropwise to prevent local micelle aggregation and improve the uniformity of electrode bonding. A step-by-step mixing method is used to achieve uniform dispersion of the solid phase and precise control of viscosity, eliminating bubble defects. This equipment uses a step-by-step control panel to link the stirring shaft, and synchronously adjusts the discharge gap opening with the rotation position of the stirring blade to achieve dynamic matching of the slurry flow rate and shear force. , eliminating start-stop dripping, and at the same time rotating the adjusting screw to drive the baffle to rise and fall, changing the discharge gap width in real time, without changing the mold, piston plate integrated stirring, the active shaft penetrates the piston plate, and drives three sets of blades through the hexagonal transmission sleeve to forcibly break the slurry agglomerates and maintain uniform dispersion of solid and liquid. At the same time, the guide rod cooperates with the air supply pipe to quickly change the position of the piston plate and quickly adjust the slurry delivery pressure in the operating chamber to ensure constant discharge flow rate. The adjustment method of gear meshing and electric push rod locking can adjust the rotation of the coating frame, and the positioning rod is embedded in the card slot for rigid fixation to meet the coating of curved and special-shaped collectors. The booster pump is directly connected to the feed pipe, and the delivery pressure is adjustable to adapt to high solid content slurry. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a schematic diagram of the main three-dimensional structure of a positive electrode coating device for an all-solid-state battery described in the present invention.

[0041] Figure 2 This is a schematic diagram of the rear stereoscopic structure of a positive electrode coating device for an all-solid-state battery according to the present invention.

[0042] Figure 3 This is a schematic side view of the cross-sectional structure of a positive electrode coating device for an all-solid-state battery according to the present invention.

[0043] Figure 4 This is a schematic diagram of the main cross-sectional structure of a positive electrode coating device for an all-solid-state battery described in the present invention.

[0044] Figure 5 This is a schematic diagram of the rear cross-sectional structure of a positive electrode coating device for an all-solid-state battery described in the present invention.

[0045] Figure 6 This is a schematic diagram of the main three-dimensional structure of the piston plate of the positive electrode coating equipment of the all-solid-state battery described in the present invention.

[0046] Figure 7 This is a schematic diagram of the rear three-dimensional structure of the piston plate of the positive electrode coating equipment of an all-solid-state battery described in the present invention.

[0047] Figure 8 A positive electrode coating device for an all-solid-state battery according to the present invention Figure 2 Enlarged structural diagram at point A in the middle.

[0048] Figure 9 A positive electrode coating device for an all-solid-state battery according to the present invention Figure 3 Enlarged structural diagram at point B in the middle.

[0049] In the figure: 1. Base plate, 2. Support rod, 3. Mounting shaft, 4. Coating frame, 5. Operating chamber, 6. Discharge gap, 7. Feed pipe, 8. Booster pump, 9. Piston plate, 10. Guide rod, 11. Spring, 12. Air supply pipe, 13. Positioning gear, 14. Adjustment motor, 15. Drive gear, 16. Mounting frame, 17. First electric push rod, 18. Slot, 19. Positioning rod, 20. Adjustment frame, 21. Fixed frame, 22. Adjustment screw, 23. Adjustment baffle, 24. Active shaft, 25. Transmission sleeve, 26. Transmission sprocket, 27. Passive shaft, 28. Passive sprocket, 29. Chain, 30. Stirring motor, 31. Transmission rod, 32. Stirring blade, 33. Guide frame, 34. Connecting rod, 35. Step control board, 36. Sealing guide sleeve. DETAILED DESCRIPTION

[0050] The present invention will be described in detail below with reference to the accompanying drawings. Figure 1-9 As shown, a positive electrode coating method and coating equipment for an all-solid-state battery.

[0051] Embodiment: A method for coating a positive electrode of an all-solid-state battery comprises the following steps:

[0052] Step S1: Raw material preparation: 65-70 parts by weight of high nickel ternary electrolyte, 23-28 parts by weight of sulfide electrolyte, 3-6 parts by weight of conductive agent, 3-3.5 parts by weight of PTFE polytetrafluoroethylene emulsion, 55 parts by weight of toluene, and 0.4-0.6 parts by weight of oleic acid;

[0053] Step S2: Pretreatment: drying the high nickel ternary electrolyte at 120°C in vacuum for 12 hours, crushing and sieving the sulfide electrolyte, mixing the conductive agent by ball milling for 1 hour, diluting the PTFE polytetrafluoroethylene emulsion to a concentration of 20%, dehydrating toluene through molecular sieves to a content of less than 10 ppm, and pre-dissolving oleic acid in toluene;

[0054] Step S3: mixing toluene and oleic acid, and dispersing at 2000 rpm for 10 min;

[0055] Add sulfide electrolyte and ball mill at 500 rpm for 30 min;

[0056] Add conductive agent and stir for 20 minutes;

[0057] Add high nickel ternary metals in batches and stir at low speed for 40 minutes;

[0058] Add PTFE polytetrafluoroethylene emulsion dropwise, stir for 20 minutes and then vacuum degas. The viscosity is controlled at 8000±500 mPas.

[0059] Step S4: Aluminum foil is selected as the substrate and is mounted on a roller conveyor device with one side in contact with the coating device;

[0060] Step S5: moving the coating device to a position corresponding to the aluminum foil conveying device, and fixing the bottom plate to support the whole device;

[0061] Step S6: connecting the feed pipe to the slurry conveying equipment and the air supply pipe to the gas pressurizing equipment;

[0062] Step S7: According to the width of the aluminum foil and the coating requirements, the adjusting screw is turned to push the adjusting baffle to block part of the discharge gap to match the coating width;

[0063] Step S8: retract the first electric push rod to disengage the positioning rod from the positioning gear; start the adjustment motor to drive the gear set to adjust the inclination angle of the coating frame, and reset the push rod to lock the positioning gear;

[0064] Step S9: starting the booster pump to increase the slurry flow rate, and the slurry is injected into the operating cavity of the coating frame through the feed pipe;

[0065] Step S10: If the slurry pressure is insufficient, high-pressure gas is injected into the air supply pipe to push the piston plate to move, and the compression spring is temporarily pressurized. After the pressure of the booster pump is restored, the gas is released to maintain uniform pressure;

[0066] Step S11: The stirring motor drives the driving shaft, which drives the toggle shafts on both sides of the piston plate to rotate through the chain transmission. The three stirring blades forcibly break up the slurry agglomerates to maintain uniform dispersion of solid and liquid;

[0067] Step S12: The slurry is coated onto the surface of the aluminum foil from the discharge gap;

[0068] Step S13: When the piston plate moves, the connecting rod pushes the step control plate to embed into the side of the discharge gap, changing the gap spacing to accurately control the local discharge pressure;

[0069] Step S14: After coating is completed, the material supply is stopped, the gas is released to reset the piston plate, and the spring is stretched to return to its initial state.

[0070] A positive electrode coating device for an all-solid-state battery includes a base plate 1, with a coating structure mounted on the upper end of the base plate 1. The coating structure includes: two support rods 2, two mounting shafts 3, a coating frame 4, an adjustment and positioning assembly, an operating cavity 5, a discharge gap 6, a width adjustment assembly, a feed pipe 7, a booster pump 8, a piston plate 9, four guide rods 10, four springs 11, an air supply pipe 12, a stirring assembly, and a feed control assembly;

[0071] Two support rods 2 are respectively installed on both sides of the upper end of the base plate 1, and two mounting shafts 3 are respectively embedded in the two support rods 2 through bearings. The two ends of the coating frame 4 are connected to one end of the two mounting shafts 3 by bolts. The adjustment and positioning component is fixedly installed on the upper end of one of the support rods 2, and the other end is fixedly connected to one of the mounting shafts 3. The operating cavity 5 is opened in the coating frame 4, and the discharge gap 6 is opened on one side of the coating frame 4 and communicated with one side of the operating cavity 5. The width adjustment component is fixedly installed on one side of the upper end of the coating frame 4, and one end of the feeding pipe 7 is embedded in the upper wall surface of the coating frame 4 and communicated with the operating cavity 5. The pressure pump 8 is located between the feed pipes 7, the piston plate 9 is movably embedded in the operating chamber 5, one end of the four guide rods 10 is respectively connected to the four corners of one end of the piston plate 9, and the other ends are respectively passed through the side walls of the coating frame 4, four springs 11 are respectively movably sleeved on the upper ends of the four guide rods 10, and are all located outside the coating frame 4, the air supply pipe 12 is located on one side of the coating frame 4, and one end is connected to the other end of the operating chamber 5, one end of the stirring assembly is movably embedded in the piston plate 9, and the other end is installed at the center of the side wall of the coating frame 4, one end of the feeding control assembly is connected to one end of the stirring assembly, and the other end is movably embedded in the discharge gap 6.

[0072] When coating the positive electrode of the all-solid-state battery, the staff first moves the device to the designated position and corresponds to the aluminum foil conveying equipment, supports the device as a whole through the bottom plate 1, and then connects the feed pipe 7 of the device to the slurry conveying equipment. According to the width of the aluminum foil and the coating requirements, the width adjustment component is adjusted, and then the flow rate of the slurry in the feed pipe 7 is increased by the provided booster pump 8. Then, the slurry is injected into the operating cavity 5 in the coating frame 4 through the feed pipe 7, and finally, the slurry is coated on the side wall of the aluminum foil through the discharge gap 6. At the same time, the air supply pipe 12 on one side of the coating frame 4 is connected to the gas boosting equipment, and the high-pressure gas is delivered to one side of the coating frame 4 through the air supply pipe 12. As the air pressure increases, the piston plate 9 in the operating cavity 5 is pushed to move, thereby changing the storage space of the slurry in the operating cavity 5. The four guide rods 10 provided cooperate with the sealing guide sleeve 36 on one side of the coating frame 4 to ensure the movement stability of the piston plate 9, and as the piston plate 9 moves, the guide rod 1 0 side is compressed. When the overall conveying pressure of the slurry is insufficient, high-pressure gas can be quickly injected through the air supply pipe 12 to push the piston plate 9 to one side, temporarily increasing the discharge pressure of the slurry. The delivery pressure of the booster pump 8 can then be changed to adjust the delivery pressure of the slurry. As the delivery pressure of the booster pump 8 increases, the specified gas is released through the air supply pipe 12 to ensure the uniformity of the slurry delivery pressure. When facing different coating requirements, the angles of the coating frame 4 and the two mounting shafts 3 in the two support rods 2 can be changed by setting an adjustment positioning component, and the inclination angle of the coating frame 4 can be adjusted to meet the coating requirements of curved and special-shaped collectors. During the slurry conveying process, the stirring component at the upper end of the piston plate 9 works to mix and stir the slurry in the operating cavity 5, forcibly break up the slurry agglomerates, and maintain uniform dispersion of solid and liquid. At the same time, the overall position of the piston plate 9 can be changed according to different conveying requirements, and the slurry delivery pressure can be further changed by cooperating with the feeding control component and the discharge gap 6.

[0073] In the specific implementation process, the adjustment and positioning assembly includes: a positioning gear 13, an adjustment motor 14, a driving gear 15, a mounting frame 16, a first electric push rod 17, a plurality of slots 18 and a positioning rod 19;

[0074] The positioning gear 13 is fixedly mounted on the upper end of one of the mounting shafts 3, the adjusting motor 14 is fixedly mounted on the inner wall of one of the support rods 2, the driving gear 15 is fixedly mounted on the driving end of the adjusting motor 14, and one side is engaged with the positioning gear 13, the mounting frame 16 is fixedly mounted on the top of one of the support rods 2, the first electric push rod 17 is fixedly mounted on one side of the mounting frame 16, and a number of slots 18 are evenly opened on the side wall of the positioning gear 13, one end of the positioning rod 19 is connected to the telescopic end of the first electric push rod 17, and the other end movably passes through the lower end of the mounting frame 16 and is movably embedded in one of the slots 18.

[0075] When adjusting the angle of the coating frame 4, first drive the first electric push rod 17 on the side of the mounting frame 16 to retract, drive the positioning rod 19 to separate from the slot 18 on the side of the positioning gear 13, and then drive the adjustment motor 14 on the side of the support rod 2 to work. By adjusting the motor 14 and cooperating with the drive gear 15, the angle of the positioning gear 13 and the mounting shaft 3 in the support rod 2 is changed, and the angle adjustment of the coating frame 4 can be achieved. Then, drive the first electric push rod 17 to reset until one end of the positioning rod 19 is embedded in the designated slot 18, and the positioning gear 13 is rotationally limited to ensure the overall stability of the coating frame 4.

[0076] In the specific implementation process, the width adjustment assembly includes: an adjustment frame 20, a plurality of fixing frames 21, a plurality of adjustment screws 22 and a plurality of adjustment baffles 23;

[0077] The adjusting frame 20 is fixedly embedded on one side of the upper wall of the coating frame 4, and several fixing frames 21 are evenly distributed on one side of the upper end of the adjusting frame 20. Several adjusting screws 22 are movably embedded in the several fixing frames 21 respectively, and the bottom ends of several adjusting baffles 23 are movably embedded in the adjusting frame 20, and the top ends are movably connected to the bottom ends of several adjusting screws 22 through bearings.

[0078] When facing aluminum foil coating of different specifications, the staff will turn the adjusting screw 22 at the specified position according to the coating position. Under the cooperation of the adjusting screw 22 and the internal thread in the fixing frame 21, the specified adjusting baffle 23 is pushed downward in the adjusting frame 20 to block the discharge gap 6 at the specified position and change the coating width.

[0079] In the specific implementation process, the stirring assembly includes: a driving shaft 24, a transmission sleeve 25, two driving sprockets 26, two driven shafts 27, two driven sprockets 28, two chains 29, a stirring motor 30, a transmission rod 31 and three stirring blades 32;

[0080] The driving shaft 24 is embedded in the center of the piston plate 9 through a sealed bearing, the transmission sleeve 25 is fixedly mounted on one side of the driving shaft 24, the two transmission sprockets 26 are both mounted on the outside of the transmission sleeve 25, the two driven shafts 27 are respectively embedded on both sides of the piston plate 9 through sealed bearings, the two driven sprockets 28 are respectively mounted on one side of the upper end of the two driven shafts 27, one end of the two chains 29 is movably sleeved on the upper ends of the two transmission sprockets 26, and the other end is movably sleeved on the upper ends of the two driven sprockets 28, the stirring motor 30 is fixedly mounted at the center of one side of the coating frame 4, the transmission rod 31 is embedded in the wall of one side of the coating frame 4 through a sealed bearing, and one end is connected to the driving end of the stirring motor 30, the other end of the transmission rod 31 is movably embedded in the transmission sleeve 25, and the three stirring blades 32 are respectively mounted on the driving shaft 24 and the other side of the two driven shafts 27.

[0081] When the slurry enters the operating cavity 5, the stirring motor 30 on the outside of the coating frame 4 works, and the transmission rod 31 cooperates with the transmission sleeve 25 to drive the driving shaft 24 to rotate. At the same time, with the cooperation of the two transmission sprockets 26, the two driven sprockets 28 and the two chains 29, the two toggle shafts on both sides of the piston plate 9 follow the rotation, and the slurry is mixed by the three stirring blades 32 on one side of the driving shaft 24 and the two driven shafts 27. The transmission sleeve 25 is arranged to cooperate with the transmission rod 31, so that when the piston plate 9 moves, the rotation effect of the stirring blades 32 is not affected.

[0082] In the specific implementation process, the feeding control assembly includes: three guide frames 33, three connecting rods 34 and a step control plate 35;

[0083] The bottom ends of the three guide frames 33 are connected to the lower end of the operating cavity 5, and the three connecting rods 34 are movably embedded in the three guide frames 33, and one end is connected to the center of the three stirring blades 32 through bearings. One end of the step control panel 35 is connected to the other end of the three connecting rods 34, and the other end is movably embedded in the discharge gap 6.

[0084] When the discharge width of the discharge gap 6 changes, high-pressure gas is input through the air supply pipe 12, the piston plate 9 moves to one side, and the three connecting rods 34 are pushed to one side within the three guide frames 33 by the three stirring blades 32 until one end of the step control plate 35 is embedded in one side of the discharge gap 6. By changing the distance between the step control plate 35 and the discharge gap 6, the overall discharge pressure at the coating position can be changed.

[0085] In a specific implementation process, the inner hole of the transmission sleeve 25 is hexagonal, and the transmission rod 31 is a hexagonal transmission rod 31 .

[0086] The transmission rod 31 and the transmission sleeve 25 are connected by a movable embedding method. When the position of the piston plate 9 changes, the transmission sleeve 25 moves along the upper end of the transmission rod 31 with the piston plate 9 without affecting the driving effect of the transmission rod 31 and the transmission sleeve 25.

[0087] In a specific implementation process, an internal thread is processed at the connection position between the fixing frame 21 and the adjusting screw 22. Through the cooperation between the internal thread and the adjusting screw 22, stable adjustment of the adjusting baffle 23 can be achieved.

[0088] During the specific implementation process, sealing guide sleeves 36 are installed at the connection positions of the coating frame 4 and the four guide rods 10. By cooperating with the guide rods 10, the sealing effect of the connection position is guaranteed while ensuring the movement effect of the guide rods 10, thereby avoiding the impact of internal air pressure changes on the coating.

[0089] The above technical solutions only reflect the preferred technical solutions of the technical solutions of the present invention. Any changes that may be made to certain parts thereof by those skilled in the art all reflect the principles of the present invention and fall within the scope of protection of the present invention.

Claims

1. A method for coating a positive electrode of an all-solid-state battery, characterized in that: The following steps are included: Step S1: Raw material preparation: 65-70 parts by weight of high nickel ternary electrolyte, 23-28 parts by weight of sulfide electrolyte, 3-6 parts by weight of conductive agent, 3-3.5 parts by weight of PTFE polytetrafluoroethylene emulsion, 55 parts by weight of toluene, and 0.4-0.6 parts by weight of oleic acid; Step S2: Pretreatment: drying the high nickel ternary electrolyte at 120°C in vacuum for 12 hours, crushing and sieving the sulfide electrolyte, mixing the conductive agent by ball milling for 1 hour, diluting the PTFE polytetrafluoroethylene emulsion to a concentration of 20%, dehydrating toluene through molecular sieves to a content of less than 10 ppm, and pre-dissolving oleic acid in toluene; Step S3: mixing toluene and oleic acid, and dispersing at 2000 rpm for 10 min; Add sulfide electrolyte and ball mill at 500 rpm for 30 min; Add conductive agent and stir for 20 minutes; Add high nickel ternary metals in batches and stir at low speed for 40 minutes; Add PTFE polytetrafluoroethylene emulsion dropwise, stir for 20 minutes and then vacuum degas. The viscosity is controlled at 8000±500 mPas. Step S4: Aluminum foil is selected as the substrate and is mounted on a roller conveyor device with one side in contact with the coating device; Step S5: moving the coating device to a position corresponding to the aluminum foil conveying device, and fixing the bottom plate to support the whole device; Step S6: connecting the feed pipe to the slurry conveying equipment and the air supply pipe to the gas pressurizing equipment; Step S7: According to the width of the aluminum foil and the coating requirements, the adjusting screw is turned to push the adjusting baffle to block part of the discharge gap to match the coating width; Step S8: retracting the first electric push rod to disengage the positioning rod from the positioning gear; Start the adjustment motor to drive the gear set, adjust the inclination angle of the coating frame, and reset the push rod to lock the positioning gear; Step S9: starting the booster pump to increase the slurry flow rate, and the slurry is injected into the operating cavity of the coating frame through the feed pipe; Step S10: If the slurry pressure is insufficient, high-pressure gas is injected into the air supply pipe to push the piston plate to move, and the compression spring is temporarily pressurized. After the pressure of the booster pump is restored, the gas is released to maintain uniform pressure; Step S11: The stirring motor drives the driving shaft, which drives the toggle shafts on both sides of the piston plate to rotate through the chain transmission. The three stirring blades forcibly break up the slurry agglomerates to maintain uniform dispersion of solid and liquid; Step S12: The slurry is coated onto the surface of the aluminum foil from the discharge gap; Step S13: When the piston plate moves, the connecting rod pushes the step control plate to embed into the side of the discharge gap, changing the gap spacing to accurately control the local discharge pressure; Step S14: After coating is completed, the material supply is stopped, the gas is released to reset the piston plate, and the spring is stretched to return to its initial state.

2. A positive electrode coating device for an all-solid-state battery, applied to the positive electrode coating method for an all-solid-state battery according to claim 1, characterized in that: The invention comprises a bottom plate (1), wherein a coating structure is installed on the upper end of the bottom plate (1), and the coating structure comprises: two support rods (2), two mounting shafts (3), a coating frame (4), an adjustment and positioning assembly, an operating cavity (5), a discharge gap (6), a width adjustment assembly, a feed pipe (7), a booster pump (8), a piston plate (9), four guide rods (10), four springs (11), an air supply pipe (12), a stirring assembly, and a feed control assembly; The two support rods (2) are respectively installed on both sides of the upper end of the base plate (1), the two mounting shafts (3) are respectively embedded in the two support rods (2) through bearings, the two ends of the coating frame (4) are respectively connected to one end of the two mounting shafts (3) through bolts, the adjustment positioning component is fixedly installed on the upper end of one of the support rods (2), and the other end is fixedly connected to one of the mounting shafts (3), the operating cavity (5) is opened in the coating frame (4), the discharge gap (6) is opened on one side of the coating frame (4), and is communicated with one side of the operating cavity (5), the width adjustment component is fixedly installed on one side of the upper end of the coating frame (4), one end of the feed pipe (7) is embedded in the upper wall surface of the coating frame (4), and is communicated with the operating cavity (5), The booster pump (8) is located between the feed pipes (7), the piston plate (9) is movably embedded in the operating cavity (5), one end of the four guide rods (10) is respectively connected to the four corners of one end of the piston plate (9), and the other ends are respectively passed through the side walls of the coating frame (4), the four springs (11) are respectively movably sleeved on the upper ends of the four guide rods (10), and are all located outside the coating frame (4), the air supply pipe (12) is located on one side of the coating frame (4), and one end is connected to the other end of the operating cavity (5), one end of the stirring component is movably embedded in the piston plate (9), and the other end is installed at the center of the side wall of the coating frame (4), one end of the feeding control component is connected to one end of the stirring component, and the other end is movably embedded in the discharge gap (6).

3. The positive electrode coating device for an all-solid-state battery according to claim 2, characterized in that: The adjustment and positioning assembly comprises: a positioning gear (13), an adjustment motor (14), a driving gear (15), a mounting frame (16), a first electric push rod (17), a plurality of slots (18) and a positioning rod (19); The positioning gear (13) is fixedly mounted on the upper end of one of the mounting shafts (3), the adjusting motor (14) is fixedly mounted on the inner wall of one of the support rods (2), the driving gear (15) is fixedly mounted on the driving end of the adjusting motor (14), and one side is meshed with the positioning gear (13), the mounting frame (16) is fixedly mounted on the top of one of the support rods (2), the first electric push rod (17) is fixedly mounted on one side of the mounting frame (16), a plurality of the slots (18) are evenly arranged on the side wall of the positioning gear (13), one end of the positioning rod (19) is connected to the telescopic end of the first electric push rod (17), and the other end movably passes through the lower end of the mounting frame (16) and is movably embedded in one of the slots (18).

4. The positive electrode coating device for an all-solid-state battery according to claim 2, characterized in that: The width adjustment assembly comprises: an adjustment frame (20), a plurality of fixing frames (21), a plurality of adjustment screws (22), and a plurality of adjustment baffles (23); The adjusting frame (20) is fixedly embedded in one side of the upper wall of the coating frame (4), a plurality of the fixing frames (21) are evenly distributed on one side of the upper end of the adjusting frame (20), a plurality of the adjusting screws (22) are movably embedded in the plurality of the fixing frames (21), and the bottom ends of the plurality of the adjusting baffles (23) are movably embedded in the adjusting frame (20), and the top ends are movably connected to the bottom ends of the plurality of the adjusting screws (22) through bearings.

5. The positive electrode coating device for an all-solid-state battery according to claim 2, characterized in that: The stirring assembly comprises: a driving shaft (24), a transmission sleeve (25), two driving sprockets (26), two driven shafts (27), two driven sprockets (28), two chains (29), a stirring motor (30), a transmission rod (31) and three stirring blades (32); The driving shaft (24) is embedded in the center of the piston plate (9) through a sealed bearing, the transmission sleeve (25) is fixedly installed on one side of the driving shaft (24), the two transmission sprockets (26) are installed on the outside of the transmission sleeve (25), the two driven shafts (27) are respectively embedded in both sides of the piston plate (9) through sealed bearings, the two driven sprockets (28) are respectively installed on one side of the upper end of the two driven shafts (27), and one end of the two chains (29) is movably sleeved on the two transmission sprockets (26). ) upper end, and the other end is movably mounted on the upper ends of the two passive sprockets (28), the stirring motor (30) is fixedly mounted at the center of one side of the coating frame (4), the transmission rod (31) is embedded in the wall of one side of the coating frame (4) through a sealed bearing, and one end is connected to the driving end of the stirring motor (30), the other end of the transmission rod (31) is movably embedded in the transmission sleeve (25), and the three stirring blades (32) are respectively mounted on the other side of the active shaft (24) and the two passive shafts (27).

6. The positive electrode coating device for an all-solid-state battery according to claim 5, characterized in that: The feeding control assembly includes: three guide frames (33), three connecting rods (34) and a step control plate (35); The bottom ends of the three guide frames (33) are connected to the lower end of the operating cavity (5), the three connecting rods (34) are movably embedded in the three guide frames (33), and one end is connected to the center of the three stirring blades (32) through a bearing, and one end of the step control plate (35) is connected to the other end of the three connecting rods (34), and the other end is movably embedded in the discharge gap (6).

7. The positive electrode coating device for an all-solid-state battery according to claim 5, characterized in that: The inner hole of the transmission sleeve (25) is hexagonal in shape, and the transmission rod (31) is a hexagonal transmission rod (31).

8. The positive electrode coating device for an all-solid-state battery according to claim 4, characterized in that: An internal thread is machined at the connection position between the fixing frame (21) and the adjusting screw (22).

9. The positive electrode coating device for an all-solid-state battery according to claim 2, characterized in that: Sealing guide sleeves (36) are installed at the connection positions between the coating frame (4) and the four guide rods (10).

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