Solid-state battery roll-to-roll positive electrode inkjet mounting method and application

Abstract

This invention discloses an inkjet printing method for mounting the positive electrode of a roll-to-roll solid-state battery using a frame, relating to the field of solid-state battery technology. This invention provides a roll-to-roll process route of "laser cleaning + inkjet printing + die-cutting." This method uses laser cleaning to create grooves, limiting the flow of the adhesive and improving the dimensional accuracy of the frame. It also controls the height of the frame within the positive electrode grooves to be consistent with the height of the positive electrode sheet, avoiding new height differences. Finally, it is die-cut into an electrode sheet of the same size as the negative electrode sheet. This utilizes the frame to replace the negative electrode allowance area, eliminating the need for embedding the positive electrode sheet within the frame, thus improving stacking accuracy and efficiency. Furthermore, the continuous laser cleaning and inkjet printing of roll-to-roll significantly shortens the overall frame preparation and mounting time, providing an effective solution for incorporating this battery accessory into mass battery production.

Description

Technical Field

[0001] This invention relates to the field of solid-state battery technology, and more specifically, to a method and application for inkjet mounting of a roll-to-roll positive electrode in a solid-state battery. Background Technology

[0002] All-solid-state batteries abandon traditional separators, employing stacking and isostatic pressing processes to achieve dense contact between the electrode and electrolyte interfaces under high voltages of hundreds of megapascals. However, the high-pressure process easily leads to electrode edge collapse, causing direct contact between the positive and negative electrodes and resulting in a short circuit. Therefore, setting an insulating frame at the electrode edge has become the mainstream solution, simultaneously providing structural support, electrical insulation, and enhanced interface adhesion. Compared to traditional methods such as printing and transfer printing, inkjet printing offers advantages such as digital control, flexible adaptation, plateless production, and contactless processing. It can achieve more stable control over the frame contour, dimensional accuracy, and edge consistency, effectively reducing problems such as adhesive overflow, adhesive breakage, and poor dimensional accuracy. By optimizing the inkjet path, adhesive properties, and online visual closed-loop control, yield and production cycle time can be significantly improved, while eliminating screen and fixture replacement and cleaning processes, reducing material waste and overall costs.

[0003] Roll-to-roll frame stacking is the core mid-stage process for mass production of all-solid-state batteries. It uses continuous roll material + electrode edge insulating frame + high-precision stacking + isostatic pressing to replace the traditional liquid lithium battery winding, solving the three major pain points of solid-state batteries: no separator, high-voltage formation, and electrolyte easy to bend and short-circuit. It directly determines the cell yield and interface consistency. However, the existing frame stacking technology still has the following problems: (1) The adhesive has fluidity, which can easily lead to problems such as adhesive overflow and poor frame size accuracy; (2) The inkjet technology has low efficiency and cannot meet the mass production requirements for frame application; (3) Whether the frame is prefabricated or manufactured on-site, the accuracy requirements in subsequent stacking are relatively high. Otherwise, bridging will occur between the electrode and the frame. At present, it is difficult to achieve accurate installation.

[0004] Therefore, there is an urgent need to optimize the roll-to-roll mounting process for all-solid-state batteries in order to improve the efficiency and accuracy of frame mounting and ensure the quality of solid-state battery cells.

[0005] In view of this, the present invention is proposed. Summary of the Invention

[0006] The purpose of this invention is to provide a method and application for inkjet mounting of solid-state battery rolls to the positive electrode, aiming to improve the automation and efficiency of the roll mounting process, while also enhancing the mounting accuracy.

[0007] This invention is implemented as follows: In a first aspect, the present invention provides a method for inkjet mounting of a solid-state battery roll to a positive electrode, comprising: Preparation before cleaning: The rolled positive electrode is fed to the laser cleaning station through the feeding device; Laser cleaning: The first surface of the positive electrode is laser-cleaned to form a cleaning tank; Inkjet printing: Ink is sprayed into the formed cleaning tank to fill the cleaning tank with adhesive. Curing: The adhesive in the cleaning tank is cured to form an adhesive frame; Die-cutting: The rolled positive electrode is die-cut. After die-cutting, the sum of the dimensions of the frame and the positive electrode sheet is consistent with the dimensions of the negative electrode sheet, and the position of the frame matches the negative electrode allowance area.

[0008] In an optional implementation, during the inkjet process, the thickness of the adhesive is controlled to be 80%-100% of the depth of the cleaning tank opening; And / or, the viscosity of the adhesive is 20 cP-200 cP.

[0009] In an optional implementation, during the laser cleaning process, the width of the cleaning tank opening is controlled to be 1mm-6mm. And / or, the groove depth is 20μm-110μm.

[0010] In an optional embodiment, during the preparation of the positive electrode roll, the foil at both ends in the width direction of the positive electrode is exposed, and multiple cleaning tanks formed by laser cleaning extend along the width direction and are spaced apart along the length direction.

[0011] In an optional implementation, the laser type used in the laser cleaning process is selected from MOPA pulsed fiber lasers, composite lasers, carbon dioxide lasers, ultraviolet lasers, or continuous fiber lasers; the laser pulse is nanosecond, picosecond, or femtosecond.

[0012] In an optional implementation, a picosecond laser is used, with the laser power controlled at 50W-300W, the pulse frequency at 2000kHz-4000kHz, and the scanning speed at 30000mm / s-60000mm / s.

[0013] In an optional embodiment, after curing and before die-cutting, the second surface of the positive electrode opposite to the first surface is sequentially subjected to pre-cleaning preparation, laser cleaning, inkjet printing, and curing.

[0014] In an optional implementation, the pre-cleaning preparation steps further include: after being sent to the laser cleaning station, electrode correction, electrode positioning and electrode smoothing are performed in sequence; Among them, electrode smoothing is to use a negative pressure smoothing device to make the electrode flat; And / or, a negative pressure dust removal device may be used during laser cleaning.

[0015] In an optional implementation, after laser cleaning, electrode positioning and electrode smoothing are performed sequentially. Among them, electrode positioning is used to align the processing position with the inkjet position; electrode smoothing is achieved by using a negative pressure smoothing device to flatten the electrode.

[0016] In an optional implementation, the adhesive is cured by ultraviolet light curing or oven curing.

[0017] Secondly, the present invention also provides the application of the inkjet mounting method for solid-state battery roll-to-roll positive electrode provided in any of the above embodiments in the preparation of solid-state batteries.

[0018] This invention offers the following advantages: It provides a roll-to-roll process of "laser cleaning + inkjet printing + die-cutting." This method uses laser cleaning to create grooves, limiting the flow of the adhesive and improving the dimensional accuracy of the frame. It also controls the height of the frame within the positive electrode grooves to match the height of the positive electrode sheet, preventing new height differences. Finally, it is die-cut into an electrode sheet of the same size as the negative electrode sheet. This means the frame replaces the negative electrode allowance area, eliminating the need for embedding the positive electrode sheet within the frame, thus improving stacking accuracy and efficiency. Furthermore, the continuous roll-to-roll laser cleaning and inkjet printing significantly shortens the overall frame preparation and installation time, providing an effective solution for incorporating this battery accessory into mass battery production. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A process flow diagram is provided for embodiments of the present invention; Figure 2 This is a schematic diagram of laser cleaning provided in Example 1; Figure 3 This is a schematic diagram of laser cleaning provided in Example 2; Figure 4 This is a schematic diagram of laser cleaning provided in Example 3; Figure 5 This is a schematic diagram of laser cleaning provided in Example 4. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased commercially.

[0022] This invention provides a method for inkjet printing of a frame for mounting solid-state battery roll-to-roll positive electrode. Overall, it follows a roll-to-roll process of "laser cleaning + inkjet printing + die cutting". By using continuous cleaning and inkjet printing for roll-to-roll mounting, the automation and efficiency of the frame mounting process are improved, solving the core difficulties of low frame mounting efficiency and poor precision, and ensuring the quality of solid-state battery cells.

[0023] like Figure 1 As shown, the steps of the inkjet mounting method for the frame provided in this embodiment of the invention are as follows: S1. Preparation before cleaning The coiled positive electrode is fed to the laser cleaning station via the unloading device, ready for the laser cleaning operation in step S2.

[0024] To improve the accuracy of laser cleaning operations, after the electrode is delivered to the laser cleaning station, it undergoes electrode alignment, electrode positioning, and electrode smoothing in sequence. Electrode alignment refers to correcting the rolled material; electrode positioning refers to positioning the processing position; and electrode smoothing uses a negative pressure smoothing device to flatten the electrode and prevent warping.

[0025] There are no restrictions on the specific operation method for electrode correction. For example, infrared correction can be used to detect the edge with infrared light. If the infrared light detects the electrode on one side, the electrode can be moved to the other side.

[0026] There are no restrictions on the specific operation method for electrode positioning. Positioning can be achieved using a visual inspection system, such as beam positioning.

[0027] Electrode smoothing can utilize suction generated by a negative pressure smoothing device, which is convenient to operate, but it is not limited to this. Specifically, the negative pressure smoothing device is an existing device, the core of which is to use vacuum negative pressure adsorption + directional stretching to eliminate electrode wrinkles, water ripples, warping and electrode tab folding before laser cleaning, ensuring a flat surface and uniform tension, and avoiding material loss, tape breakage and poor assembly.

[0028] Specifically, rolled positive electrode (positive electrode roll) is a long strip-shaped roll formed by continuously coating positive electrode material onto aluminum foil, drying, rolling, and then winding it up. It is the core feeding form for the "roll-to-roll lamination" of solid-state batteries. The positive electrode coating consists of: active material + conductive agent + binder, with single-sided or double-sided coating. The specific type of active material is not limited, such as lithium iron phosphate (LFP); ternary materials, such as NCM523, NCM622, NCM811, NCA, etc.; lithium manganese oxide (LMO); lithium-rich manganese-based materials; lithium manganese iron phosphate, etc. The type of conductive agent is not limited, such as conductive carbon black (SP, superconducting carbon black), carbon nanotubes (CNT), graphene, artificial graphite, conductive graphite, etc. The specific type of binder is not limited, such as PVDF (polyvinylidene fluoride, universal for oil-based positive electrodes), acrylic resin (for water-based positive electrodes), PI (polyimide, resistant to high-temperature solid-state batteries).

[0029] S2, Laser Cleaning Laser cleaning is performed on the first surface (A surface) of the positive electrode. The active material on the A surface of the positive electrode is cleaned and grooved using a laser to form a cleaning groove.

[0030] It should be noted that while inkjet technology offers advantages such as precise positioning and high flexibility, making it ideal for prototyping and R&D, it still faces the challenge of balancing dimensional accuracy with production efficiency. Therefore, grooving is used to limit the diffusion of the adhesive, ensuring the dimensional accuracy of the adhesive frame.

[0031] Specifically, the laser cleaning equipment can be any existing laser cleaning equipment designed for electrodes, and the specific model is not limited. The core of the laser cleaning equipment is to use pulsed laser + precise defocusing + multi-channel scanning to clean the coating in the tank without damaging the tank wall, deforming it, or damaging its edges and roughness.

[0032] In some embodiments, during the laser cleaning process, the width of the formed cleaning tank opening is controlled to be 1mm-6mm, such as 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, etc.; the tank depth is 20μm-110μm, such as 20μm, 30μm, 40μm, 50μm, 60μm, 70μm, 80μm, 90μm, 100μm, etc. The tank depth is equal to the thickness of the positive electrode active coating, the depth of the positive electrode active layer is fixed, and the cleaning tank depth is greater than or equal to the thickness of the adhesive frame; the tank width is determined according to the size of the negative electrode sheet, so that the total size of the final die-cut positive electrode sheet + adhesive frame corresponds to the size of the negative electrode sheet.

[0033] Furthermore, during the laser cleaning process, the laser type used is selected from MOPA pulsed fiber lasers, composite lasers, carbon dioxide lasers, ultraviolet lasers, or continuous fiber lasers. All of these lasers are suitable for laser cleaning of the positive electrode. The laser pulse can be nanosecond, picosecond, or femtosecond, and the specific pulse form can be any of the above.

[0034] Specifically, the MOPA pulsed fiber laser is a master oscillator power amplified pulsed fiber laser. Its core features include independently adjustable pulse width and frequency, strong process adaptability, high peak power, low heat-affected zone, and good cold-working performance; it can process highly reflective metals such as copper and aluminum without easily damaging the light source; and it boasts excellent beam quality and high processing precision.

[0035] Specifically, composite lasers (also known as hybrid / dual-wavelength lasers) combine two different wavelengths / types of lasers coaxially and synchronously. The core technology is to use "blue light / semiconductor preheating + infrared fiber deep melting" to solve the problems of spatter and low absorption rate in welding of highly reflective materials such as copper and aluminum in lithium batteries.

[0036] Specifically, CO2 lasers are gas infrared lasers with a wavelength of 10.6μm (mid-infrared). They are primarily used for "thermal processing" and are suitable for non-metallic cutting / cleaning, tab adhesive removal, and separator slitting in lithium batteries.

[0037] Specifically, ultraviolet (UV) lasers typically have wavelengths of 355nm (nanosecond) / 343nm (picosecond / femtosecond), which are cold processing methods. Lithium batteries are mainly used for electrode micro-cutting, separator / adhesive layer precision cutting, tab coating precision cleaning, glass / ceramic drilling, etc.

[0038] Specifically, continuous fiber lasers (CW fiber lasers) have a mainstream wavelength of 1080nm, providing uninterrupted and continuous light output without pulse interruptions.

[0039] In a preferred embodiment, a picosecond laser is used, with the laser power controlled between 50W and 300W, such as 50W, 80W, 100W, 130W, 150W, 180W, 200W, 230W, 250W, 280W, 300W, etc.; the pulse frequency is between 2000kHz and 4000kHz, such as 2000kHz, 2300kHz, 2500kHz, 2800kHz, 3000kHz, 3300kHz, 3500kHz, 3800kHz, 4000kHz, etc.; and the scanning speed is between 30000mm / s and 60000mm / s, such as 30000mm / s, 35000mm / s, 40000mm / s, 45000mm / s, 50000mm / s, 55000mm / s, 60000mm / s, etc. By adjusting the laser type and parameters, the position and size of the cleaning tank can be controlled more precisely, thereby improving the dimensional accuracy of the frame.

[0040] In a preferred embodiment, during the positive electrode roll preparation process, the foil at both ends in the width direction of the positive electrode is exposed (see Embodiment 5 for details). Multiple cleaning tanks formed by laser cleaning extend along the width direction and are spaced apart along the length direction. Optimizing the combination of positive electrode roll preparation and laser cleaning processes can further improve production efficiency.

[0041] Furthermore, dust and ash that may be generated during the laser cleaning process are treated using a negative pressure dust removal device during laser cleaning. The dust and ash that may be generated during laser cleaning are removed and transferred to the next work station.

[0042] S3, Inkjet Inkjet printing is performed on the cleaning tank formed in step S2, so that the sprayed adhesive enters the cleaning tank, and the thickness of the adhesive is controlled to match the depth of the cleaning tank. "Matching" means that the thickness of the adhesive and the depth of the cleaning tank are approximately the same.

[0043] Specifically, inkjet equipment can achieve precise positioning and accurately inject adhesive into the grooves of a workpiece. The specific equipment can be commonly used piezoelectric inkjet equipment.

[0044] In some embodiments, during inkjet printing, the thickness of the adhesive solution in the cleaning tank is controlled to be 80%-100% of the tank's opening depth, such as 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 100%, etc. Many existing technologies use a method of mounting an adhesive frame on the negative electrode and then fitting the positive electrode sheet. This method is prone to creating new bridging and requires extremely high precision in equipment positioning and dimensions. Therefore, we have not set the height of the adhesive frame to be completely consistent with the thickness of the active material in the positive electrode.

[0045] The type of adhesive used is not limited, and can include UV-curable adhesives, epoxy structural adhesives, acrylic adhesives, silicone adhesives, PUR hot melt adhesives, and water-based insulating adhesives. UV-curable adhesives offer advantages such as anti-powdering, fast curing, and high hardness; epoxy structural adhesives offer advantages such as high bonding strength and good temperature resistance; acrylic adhesives offer advantages such as flexible bonding, adaptability to slight electrode deformation, and good compatibility; silicone adhesives offer advantages such as buffering insulation and resistance to high and low temperatures; PUR hot melt adhesives enable rapid bonding and are suitable for high-speed production lines; water-based insulating adhesives are environmentally friendly and low-irritant, and can be used for general insulation protection. Specifically, the adhesive used can be polyacrylic acid.

[0046] Furthermore, in this embodiment of the invention, the viscosity of the adhesive solution is required to be between 20 cP and 200 cP, which meets the viscosity requirements and equipment operating conditions. Specific viscosities of the adhesive solution can be 20 cP, 30 cP, 40 cP, 50 cP, 60 cP, 70 cP, 80 cP, 90 cP, 100 cP, 110 cP, 120 cP, 130 cP, 140 cP, 150 cP, 160 cP, 170 cP, 180 cP, 190 cP, 200 cP, etc.

[0047] In some embodiments, after laser cleaning, electrode positioning and electrode smoothing are performed sequentially before inkjet printing. Electrode positioning aligns the processing position with the inkjet printing position; electrode smoothing utilizes a negative pressure smoothing device to flatten the electrode.

[0048] Specifically, the operational method for electrode positioning is not limited; it can be achieved using a visual inspection system, such as beam positioning. Electrode smoothing can utilize a negative pressure smoothing device to generate suction, which is convenient to operate, but it is not limited to this. Specifically, an electrode correction and visual positioning system can be used to achieve precise positioning.

[0049] After inkjet printing, ensure that the adhesive fills the entire cleaning tank and that the thickness of the adhesive is on the same plane as the positive electrode active material. If the adhesive form is found to be correct, then transfer it to the next station.

[0050] S4, Curing The adhesive in the cleaning tank is cured to form an adhesive frame, and after complete curing, it is transferred to the next work station.

[0051] In some embodiments, the adhesive can be cured by ultraviolet light irradiation or by drying, depending on the type of adhesive. The UV adhesive used in the above process can only be cured by absorbing sufficient energy under a specific wavelength of ultraviolet light. After curing, it has high mechanical strength, its physicochemical properties have no effect on the battery system, and it is completely insulating.

[0052] S5, Repeat Repeat the above steps for the second surface (i.e., surface B) of the positive electrode that is opposite to the first surface, that is, repeat steps S1-S4. After completion, transfer to the next station.

[0053] S6, Die Cutting The rolled positive electrode is die-cut. After die-cutting, the sum of the dimensions of the frame and the positive electrode sheet is consistent with the dimensions of the negative electrode sheet, and the position of the frame matches the negative electrode allowance area.

[0054] It should be noted that the process provided by the present invention finally die-cuts the electrode sheet into the same size as the negative electrode sheet, that is, by using a glue frame to replace the negative electrode allowance area, the process of embedding the positive electrode sheet into the glue frame is omitted, thereby improving the stacking accuracy and stacking efficiency.

[0055] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0056] The specific operation of the rolled positive electrode sheet used in the following embodiments is as follows: The positive current collector is an aluminum foil with a thickness of 10 μm and a width of 120 mm; the composition of the positive active coating by mass fraction is as follows: NCM811 95%, conductive carbon black 2%, PVDF 3%. The positive active coating is located on both sides of the positive current collector, with a single-sided thickness of 110 μm and a single-sided areal density of 20 mg / cm³. 2 .

[0057] Example 1 This embodiment provides a method for inkjet mounting of a solid-state battery roll to the positive electrode of the roll, specifically including the following steps: Step a: The rolled positive electrode sheet is conveyed to the laser cleaning station through the feeding device. After the electrode sheet is corrected, it is smoothed by the negative pressure smoothing device to ensure that the surface of the electrode sheet is flat. Then, it is precisely positioned by the vision inspection system to prepare for the laser cleaning operation.

[0058] Step b: Use a laser to completely clean and groove the active material on the A side of the positive electrode (see diagram of laser cleaning). Figure 2 Simultaneously, a negative pressure dust removal device is activated to promptly remove dust and ash generated during the cleaning process. After processing, the material is transferred to the next workstation. The groove width is 3mm, and the groove depth is 110 μm (equal to the thickness of the positive electrode active coating). A picosecond laser is used, with a controlled laser power of 200W, a pulse frequency of 2000kHz, and a scanning speed of 50000mm / s.

[0059] Step c: Using an electrode alignment and vision positioning system for precise alignment, inkjet printing is performed into the cleaning tank to ensure the adhesive completely fills the entire tank and that the adhesive thickness is approximately flush with the surface of the positive electrode active material (the adhesive thickness is 100% of the tank's rim depth). After the adhesive type is confirmed to be acceptable, it is transferred to the next station. The adhesive is composed of polyacrylic acid with a viscosity of 50 cp.

[0060] Step d: Curing the UV adhesive in the cleaning tank with ultraviolet light. After the adhesive is completely cured, transfer the electrode to the next station. The ultraviolet wavelength is 365nm, and the irradiation time is 0.2s.

[0061] Step e: After flipping the electrode, repeat steps a, b, c, and d on the positive electrode B side, and then transfer it to the next station.

[0062] Step f: Die-cut the rolled positive electrode sheet to ensure that the dimensions of the die-cut frame and positive electrode sheet are completely matched with the negative electrode sheet, and that the position of the frame is precisely matched with the negative electrode allowance area.

[0063] Tests showed that the cycle time of the process method provided in this embodiment is 2 ppm.

[0064] Example 2 (The only difference from Example 1 is the laser cleaning method in step b) This embodiment provides a method for inkjet mounting of a solid-state battery roll to the positive electrode of the roll, specifically including the following steps: Step a: The rolled positive electrode sheet is conveyed to the laser cleaning station through the feeding device. After the electrode sheet is corrected, it is smoothed by the negative pressure smoothing device to ensure that the surface of the electrode sheet is flat. Then, it is precisely positioned by the vision inspection system to prepare for the laser cleaning operation.

[0065] Step b: Use a laser to completely clean and groove the active material on the A side of the positive electrode (see diagram of laser cleaning). Figure 3 Simultaneously, a negative pressure dust removal device is activated to promptly remove dust and ash generated during the cleaning process. After processing, the material is transferred to the next workstation. The groove width is 3mm, and the groove depth is equal to the thickness of the positive electrode active coating. A picosecond laser is used, with a controlled laser power of 200W, a pulse frequency of 2000kHz, and a scanning speed of 50000mm / s.

[0066] Step c: Using an electrode alignment and vision positioning system for precise alignment, inkjet printing is performed into the cleaning tank to ensure the adhesive completely fills the entire tank and that the adhesive thickness is approximately flush with the surface of the positive electrode active material (the adhesive thickness is 100% of the tank's rim depth). After the adhesive type is confirmed to be acceptable, it is transferred to the next station. The adhesive is composed of polyacrylic acid with a viscosity of 50 cp.

[0067] Step d: The UV adhesive in the cleaning tank is cured by UV light. After the adhesive is completely cured, the electrode is transferred to the next station. The UV light and irradiation time are the same as in Example 1.

[0068] Step e: After flipping the electrode, repeat steps a, b, c, and d on the positive electrode B side, and then transfer it to the next station.

[0069] Step f: Die-cut the rolled positive electrode sheet to ensure that the dimensions of the die-cut frame and positive electrode sheet are completely matched with the negative electrode sheet, and that the position of the frame is precisely matched with the negative electrode allowance area.

[0070] In this optimized embodiment, the laser cleaning area between adjacent electrodes can be shared, saving cleaning time and reducing costs.

[0071] Tests showed that the cycle time of the process method provided in this embodiment is 2.5 ppm.

[0072] Example 3 (The only difference from Example 1 is the laser cleaning method in step b) This embodiment provides a method for inkjet mounting of a solid-state battery roll to the positive electrode of the roll, specifically including the following steps: Step a: The rolled positive electrode sheet is conveyed to the laser cleaning station through the feeding device. After the electrode sheet is corrected, it is smoothed by the negative pressure smoothing device to ensure that the surface of the electrode sheet is flat. Then, it is precisely positioned by the vision inspection system to prepare for the laser cleaning operation.

[0073] Step b: Use a laser to perform segmented, complete cleaning and grooving of the active material on the A side of the positive electrode (see diagram of laser cleaning). Figure 4 Simultaneously, a negative pressure dust removal device is activated to promptly remove dust and ash generated during the cleaning process. After processing, the material is transferred to the next workstation. The groove width is 3mm, and the groove depth equals the thickness of the positive electrode active coating. A picosecond laser is used, with a controlled laser power of 200W, a pulse frequency of 2000kHz, and a scanning speed of 50000mm / s. Specifically, such as... Figure 4 As shown, the laser sequentially cleans each single side, and then the above process is repeated until the desired cleaning effect is achieved. This method firstly eliminates the need for laser traces during the entire cleaning process, shortening the time; secondly, the intervals between cleaning other electrodes provide sufficient cooling time, preventing thermal deformation and burn-through.

[0074] Step c: Using an electrode alignment and vision positioning system for precise alignment, inkjet printing is performed into the cleaning tank to ensure the adhesive completely fills the entire tank and that the adhesive thickness is approximately flush with the surface of the positive electrode active material (the adhesive thickness is 100% of the tank's rim depth). After the adhesive type is confirmed to be acceptable, it is transferred to the next station. The adhesive is composed of polyacrylic acid with a viscosity of 50 cp.

[0075] Step d: The UV adhesive in the cleaning tank is cured by UV light. After the adhesive is completely cured, the electrode is transferred to the next station. The UV light and irradiation time are the same as in Example 1.

[0076] Step e: After flipping the electrode, repeat steps a, b, c, and d on the positive electrode B side, and then transfer it to the next station.

[0077] Step f: Die-cut the rolled positive electrode sheet to ensure that the dimensions of the die-cut frame and positive electrode sheet are completely matched with the negative electrode sheet, and that the position of the frame is precisely matched with the negative electrode allowance area.

[0078] Tests showed that the cycle time of the process method provided in this embodiment is 3 ppm.

[0079] Example 4 (The only difference from Example 1 is the laser cleaning method in step b and the coating distribution area on the electrode). This embodiment provides a method for inkjet mounting of a solid-state battery roll to the positive electrode of the roll, specifically including the following steps: Step a: During coating, the foil at both ends is exposed. The rolled positive electrode sheet is conveyed to the laser cleaning station through the feeding device. After the electrode sheet is corrected, the electrode sheet is smoothed by the negative pressure smoothing device to ensure that the electrode sheet surface is flat. Then, the visual inspection system is used to accurately position it in preparation for laser cleaning.

[0080] Step b: Use a laser to completely clean and groove the active material on the A side of the positive electrode (see diagram of laser cleaning). Figure 5 Simultaneously, a negative pressure dust removal device is activated to promptly remove dust and ash generated during the cleaning process. After processing, the material is transferred to the next workstation. The groove width is 3mm, and the groove depth equals the thickness of the positive electrode active coating. A picosecond laser is used, with a controlled laser power of 200W, a pulse frequency of 2000kHz, and a scanning speed of 50000mm / s. Specifically, such as... Figure 5 As shown, the foil at both ends of the roll is exposed during coating, so only the middle yellow area needs to be cleaned.

[0081] Step c: Using an electrode alignment and vision positioning system for precise alignment, inkjet printing is performed into the cleaning tank to ensure the adhesive completely fills the entire tank and that the adhesive thickness is approximately flush with the surface of the positive electrode active material (the adhesive thickness is 100% of the tank's rim depth). After the adhesive type is confirmed to be acceptable, it is transferred to the next station. The adhesive is composed of polyacrylic acid with a viscosity of 50 cp.

[0082] Step d: The UV adhesive in the cleaning tank is cured by UV light. After the adhesive is completely cured, the electrode is transferred to the next station. The UV light and irradiation time are the same as in Example 1.

[0083] Step e: After flipping the electrode, repeat steps a, b, and c on the positive electrode B side, and then transfer it to the next station.

[0084] Step f: Die-cut the rolled positive electrode sheet to ensure that the dimensions of the die-cut frame and positive electrode sheet are completely matched with the negative electrode sheet, and that the position of the frame is precisely matched with the negative electrode allowance area.

[0085] The cycle time for this process is 4 ppm.

[0086] Example 5 (The only difference from Example 4 is the optimization of the laser cleaning method) This embodiment provides a method for inkjet mounting of a solid-state battery roll to the positive electrode of the roll, specifically including the following steps: Step a: During coating, the foil at both ends is exposed. The rolled positive electrode sheet is conveyed to the laser cleaning station through the feeding device. After the electrode sheet is corrected, the electrode sheet is smoothed by the negative pressure smoothing device to ensure that the electrode sheet surface is flat. Then, the visual inspection system is used to accurately position it in preparation for laser cleaning.

[0087] Step b: Use a laser to perform incomplete cleaning and grooving of the active material on the A side of the positive electrode (see diagram of laser cleaning). Figure 5 Simultaneously, a negative pressure dust removal device is activated to promptly remove dust and ash generated during the cleaning process. After processing, the material is transferred to the next workstation. The groove width is 3mm, and the groove depth is 70μm (less than the thickness of the positive electrode active coating). A picosecond laser is used, with a controlled laser power of 200W, a pulse frequency of 2000kHz, and a scanning speed of 50000mm / s.

[0088] Step c: Using an electrode alignment and vision positioning system for precise alignment, inkjet printing is performed into the cleaning tank to ensure the adhesive completely fills the entire tank and that the adhesive thickness is consistent with the surface of the positive electrode active material (the adhesive thickness is 100% of the tank's opening depth). After the adhesive type is confirmed to be acceptable, it is transferred to the next station. The adhesive is composed of polyacrylic acid with a viscosity of 50 cp.

[0089] Step d: The UV adhesive in the cleaning tank is cured by UV light. After the adhesive is completely cured, the electrode is transferred to the next station. The UV light and irradiation time are the same as in Example 1.

[0090] Step e: After flipping the electrode, repeat steps a, b, c, and d on the positive electrode B side, and then transfer it to the next station.

[0091] Step f: Die-cut the rolled positive electrode sheet to ensure that the dimensions of the die-cut frame and positive electrode sheet are completely matched with the negative electrode sheet, and that the position of the frame is precisely matched with the negative electrode allowance area.

[0092] Tests showed that the cycle time of the process method provided in this embodiment is 6 ppm.

[0093] Example 6 This embodiment provides a method for inkjet mounting of a solid-state battery roll to the positive electrode of the roll, specifically including the following steps: Step a: The rolled positive electrode sheet is conveyed to the laser cleaning station through the feeding device. After the electrode sheet is corrected, it is smoothed by the negative pressure smoothing device to ensure that the surface of the electrode sheet is flat. Then, it is precisely positioned by the vision inspection system to prepare for the laser cleaning operation.

[0094] Step b: Use a laser to completely clean and groove the active material on the A side of the positive electrode (see diagram of laser cleaning). Figure 2Simultaneously, a negative pressure dust removal device is activated to promptly remove dust and ash generated during the cleaning process. After processing, the material is transferred to the next workstation. The groove width is 1mm, and the groove depth is equal to the thickness of the positive electrode active coating. A picosecond laser is used, with a laser power of 50W, a pulse frequency of 2000kHz, and a scanning speed of 30000mm / s.

[0095] Step c: Using an electrode alignment and vision positioning system for precise alignment, inkjet printing is performed into the cleaning tank to ensure the adhesive completely fills the entire tank and that the adhesive thickness is approximately flush with the surface of the positive electrode active material (the adhesive thickness is 100% of the tank's rim depth). After the adhesive type is confirmed to be acceptable, it is transferred to the next station. The adhesive is composed of polyacrylic acid with a viscosity of 50 cp.

[0096] Step d: The UV adhesive in the cleaning tank is cured by UV light. After the adhesive is completely cured, the electrode is transferred to the next station. The UV light and irradiation time are the same as in Example 1.

[0097] Step e: After flipping the electrode, repeat steps a, b, c, and d on the positive electrode B side, and then transfer it to the next station.

[0098] Step f: Die-cut the rolled positive electrode sheet to ensure that the dimensions of the die-cut frame and positive electrode sheet are completely matched with the negative electrode sheet, and that the position of the frame is precisely matched with the negative electrode allowance area.

[0099] Tests showed that the cycle time of the process method provided in this embodiment is 3 ppm.

[0100] Example 7 This embodiment provides a method for inkjet mounting of a solid-state battery roll to the positive electrode of the roll, specifically including the following steps: Step a: The rolled positive electrode sheet is conveyed to the laser cleaning station through the feeding device. After the electrode sheet is corrected, it is smoothed by the negative pressure smoothing device to ensure that the surface of the electrode sheet is flat. Then, it is precisely positioned by the vision inspection system to prepare for the laser cleaning operation.

[0101] Step b: Use a laser to completely clean and groove the active material on the A side of the positive electrode (see diagram of laser cleaning). Figure 2 Simultaneously, a negative pressure dust removal device is activated to promptly remove dust and ash generated during the cleaning process. After processing, the material is transferred to the next workstation. The groove width is 6mm, and the groove depth is equal to the thickness of the positive electrode active coating. A picosecond laser is used, with a laser power of 300W, a pulse frequency of 4000kHz, and a scanning speed of 60000mm / s.

[0102] Step c: Using an electrode alignment and vision positioning system for precise alignment, inkjet printing is performed into the cleaning tank to ensure the adhesive completely fills the entire tank and that the adhesive thickness is approximately flush with the surface of the positive electrode active material (the adhesive thickness is 100% of the tank's rim depth). After the adhesive type is confirmed to be acceptable, it is transferred to the next station. The adhesive is composed of polyacrylic acid with a viscosity of 50 cp.

[0103] Step d: The UV adhesive in the cleaning tank is cured by UV light. After the adhesive is completely cured, the electrode is transferred to the next station. The UV light and irradiation time are the same as in Example 1.

[0104] Step e: After flipping the electrode, repeat steps a, b, c, and d on the positive electrode B side, and then transfer it to the next station.

[0105] Step f: Die-cut the rolled positive electrode sheet to ensure that the dimensions of the die-cut frame and positive electrode sheet are completely matched with the negative electrode sheet, and that the position of the frame is precisely matched with the negative electrode allowance area.

[0106] Tests showed that the cycle time of the process method provided in this embodiment is 1 ppm.

[0107] Example 8 The only difference from Example 1 is that in step c, the thickness of the adhesive solution is 80% of the depth of the cleaning tank opening. The specific steps are as follows: Step a: The rolled positive electrode sheet is conveyed to the laser cleaning station through the feeding device. After the electrode sheet is corrected, it is smoothed by the negative pressure smoothing device to ensure that the surface of the electrode sheet is flat. Then, it is precisely positioned by the vision inspection system to prepare for the laser cleaning operation.

[0108] Step b: Use a laser to completely clean and groove the active material on the A side of the positive electrode (see diagram of laser cleaning). Figure 2 Simultaneously, a negative pressure dust removal device is activated to promptly remove dust and ash generated during the cleaning process. After processing, the material is transferred to the next workstation. The groove width is 3mm, and the groove depth is equal to the thickness of the positive electrode active coating. A picosecond laser is used, with a controlled laser power of 200W, a pulse frequency of 2000kHz, and a scanning speed of 50000mm / s.

[0109] Step c: Using an electrode alignment and vision positioning system for precise alignment, inkjet printing is performed into the cleaning tank to ensure the adhesive completely fills the entire tank and that the adhesive thickness is approximately flush with the surface of the positive electrode active material (the adhesive thickness is 80% of the tank's rim depth). After the adhesive type is confirmed to be acceptable, it is transferred to the next station. The adhesive is composed of polyacrylic acid with a viscosity of 50 cp.

[0110] Step d: The UV adhesive in the cleaning tank is cured by UV light. After the adhesive is completely cured, the electrode is transferred to the next station. The UV light and irradiation time are the same as in Example 1.

[0111] Step e: After flipping the electrode, repeat steps a, b, c, and d on the positive electrode B side, and then transfer it to the next station.

[0112] Step f: Die-cut the rolled positive electrode sheet to ensure that the dimensions of the die-cut frame and positive electrode sheet are completely matched with the negative electrode sheet, and that the position of the frame is precisely matched with the negative electrode allowance area.

[0113] Tests showed that the cycle time of the process method provided in this embodiment is 2 ppm.

[0114] Example 9 The only difference from Example 1 is the laser parameters in step b. Specifically: Step a: The rolled positive electrode sheet is conveyed to the laser cleaning station through the feeding device. After the electrode sheet is corrected, it is smoothed by the negative pressure smoothing device to ensure that the surface of the electrode sheet is flat. Then, it is precisely positioned by the vision inspection system to prepare for the laser cleaning operation.

[0115] Step b: Use a laser to completely clean and groove the active material on the A side of the positive electrode (see diagram of laser cleaning). Figure 2 Simultaneously, a negative pressure dust removal device is activated to promptly remove dust and ash generated during the cleaning process. After processing, the material is transferred to the next workstation. The groove width is 3mm, and the groove depth is equal to the thickness of the positive electrode active coating. A picosecond laser is used, with a controlled laser power of 100W, a pulse frequency of 2000kHz, and a scanning speed of 30000mm / s.

[0116] Step c: Using an electrode alignment and vision positioning system for precise alignment, inkjet printing is performed into the cleaning tank to ensure the adhesive completely fills the entire tank and that the adhesive thickness is approximately flush with the surface of the positive electrode active material (the adhesive thickness is 100% of the tank's rim depth). After the adhesive type is confirmed to be acceptable, it is transferred to the next station. The adhesive is composed of polyacrylic acid with a viscosity of 50 cp.

[0117] Step d: The UV adhesive in the cleaning tank is cured by UV light. After the adhesive is completely cured, the electrode is transferred to the next station. The UV light and irradiation time are the same as in Example 1.

[0118] Step e: After flipping the electrode, repeat steps a, b, c, and d on the positive electrode B side, and then transfer it to the next station.

[0119] Step f: Die-cut the rolled positive electrode sheet to ensure that the dimensions of the die-cut frame and positive electrode sheet are completely matched with the negative electrode sheet, and that the position of the frame is precisely matched with the negative electrode allowance area.

[0120] Tests showed that the cycle time of the process method provided in this embodiment is 0.5 ppm.

[0121] Example 10 The only difference from Example 1 is the laser parameters in step b. Specifically: Step a: The rolled positive electrode sheet is conveyed to the laser cleaning station through the feeding device. After the electrode sheet is corrected, it is smoothed by the negative pressure smoothing device to ensure that the surface of the electrode sheet is flat. Then, it is precisely positioned by the vision inspection system to prepare for the laser cleaning operation.

[0122] Step b: Use a laser to completely clean and groove the active material on the A side of the positive electrode (see diagram of laser cleaning). Figure 2 Simultaneously, a negative pressure dust removal device is activated to promptly remove dust and ash generated during the cleaning process. After processing, the material is transferred to the next workstation. The groove width is 3mm, and the groove depth is equal to the thickness of the positive electrode active coating. A picosecond laser is used, with a laser power of 400W, a pulse frequency of 4000kHz, and a scanning speed of 60000mm / s.

[0123] Step c: Using an electrode alignment and vision positioning system for precise alignment, inkjet printing is performed into the cleaning tank to ensure the adhesive completely fills the entire tank and that the adhesive thickness is approximately flush with the surface of the positive electrode active material (the adhesive thickness is 100% of the tank's rim depth). After the adhesive type is confirmed to be acceptable, it is transferred to the next station. The adhesive is composed of polyacrylic acid with a viscosity of 50 cp.

[0124] Step d: The UV adhesive in the cleaning tank is cured by UV light. After the adhesive is completely cured, the electrode is transferred to the next station. The UV light and irradiation time are the same as in Example 1.

[0125] Step e: After flipping the electrode, repeat steps a, b, c, and d on the positive electrode B side, and then transfer it to the next station.

[0126] Step f: Die-cut the rolled positive electrode sheet to ensure that the dimensions of the die-cut frame and positive electrode sheet are completely matched with the negative electrode sheet, and that the position of the frame is precisely matched with the negative electrode allowance area.

[0127] Tests showed that the cycle time of the process method provided in this embodiment was 8 ppm, and the electrode was damaged during the laser cleaning process.

[0128] Comparative Example 1 (The only difference from Example 1 is that step c is replaced with a dispensing operation) This comparative example provides a frame mounting process for roll-to-roll all-solid-state batteries, specifically including the following steps: Step a: The rolled positive electrode sheet is conveyed to the laser cleaning station through the feeding device. After the electrode sheet is corrected, it is smoothed by the negative pressure smoothing device to ensure that the surface of the electrode sheet is flat. Then, it is precisely positioned by the vision inspection system to prepare for the laser cleaning operation.

[0129] Step b: Use a laser to clean and groove the active material on the A side of the positive electrode (see diagram of laser cleaning). Figure 2 Simultaneously, a negative pressure dust removal device is activated to promptly remove dust and ash generated during the cleaning process. After processing, the material is transferred to the next workstation. The groove width is 3mm, and the groove depth is equal to the thickness of the positive electrode active coating. A picosecond laser is used, with a controlled laser power of 200W, a pulse frequency of 2000kHz, and a scanning speed of 50000mm / s.

[0130] Step c: Using an electrode alignment and vision positioning system for precise alignment, apply adhesive to the cleaning tank, ensuring the adhesive completely fills the entire tank and that the adhesive thickness is approximately flush with the surface of the positive electrode active material (the adhesive thickness is 100% of the tank's rim depth). After the adhesive type is confirmed to be acceptable, it is transferred to the next workstation. The adhesive is made of polyacrylic acid with a viscosity of 50 cp.

[0131] Step d: Curing the UV adhesive in the cleaning tank with ultraviolet light. After the adhesive is completely cured, transfer the electrode to the next station. The ultraviolet wavelength is 365nm.

[0132] Step e: After flipping the electrode, repeat steps a, b, c, and d on the positive electrode B side, and then transfer it to the next station.

[0133] Step f: Die-cut the rolled positive electrode sheet to ensure that the dimensions of the die-cut frame and positive electrode sheet are completely matched with the negative electrode sheet, and that the position of the frame is precisely matched with the negative electrode allowance area.

[0134] Tests showed that the cycle time of the process method provided in this embodiment is 0.6 ppm.

[0135] Comparative Example 2 (the only difference from Example 1 is that step c is replaced with a screen printing operation) This comparative example provides a frame mounting process for roll-to-roll all-solid-state batteries, specifically including the following steps: Step a: The rolled positive electrode sheet is conveyed to the laser cleaning station through the feeding device. After the electrode sheet is corrected, it is smoothed by the negative pressure smoothing device to ensure that the surface of the electrode sheet is flat. Then, it is precisely positioned by the vision inspection system to prepare for the laser cleaning operation.

[0136] Step b: Use a laser to clean and groove the active material on the A side of the positive electrode (see diagram of laser cleaning). Figure 2 Simultaneously, a negative pressure dust removal device is activated to promptly remove dust and ash generated during the cleaning process. After processing, the material is transferred to the next workstation. The groove width is 3mm, and the groove depth is equal to the thickness of the positive electrode active coating. A picosecond laser is used, with a controlled laser power of 200W, a pulse frequency of 2000kHz, and a scanning speed of 50000mm / s.

[0137] Step c: Using an electrode alignment and vision positioning system for precise alignment, screen printing is performed into the cleaning tank to ensure the adhesive completely fills the entire tank and that the adhesive thickness is approximately flush with the surface of the positive electrode active material (the adhesive thickness is 100% of the tank's rim depth). After the adhesive type is confirmed to be acceptable, it is transferred to the next station. The adhesive is composed of polyacrylic acid with a viscosity of 50 cp.

[0138] Step d: Curing the UV adhesive in the cleaning tank with ultraviolet light. After the adhesive is completely cured, transfer the electrode to the next station. The ultraviolet wavelength is 365nm.

[0139] Step e: After flipping the electrode, repeat steps a, b, c, and d on the positive electrode B side, and then transfer it to the next station.

[0140] Step f: Die-cut the rolled positive electrode sheet to ensure that the dimensions of the die-cut frame and positive electrode sheet are completely matched with the negative electrode sheet, and that the position of the frame is precisely matched with the negative electrode allowance area.

[0141] Tests showed that the cycle time of the process method provided in this embodiment is 1 ppm.

[0142] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for inkjet mounting of a solid-state battery roll to a positive electrode, characterized in that, include: Preparation before cleaning: The rolled positive electrode is fed to the laser cleaning station through the feeding device; Laser cleaning: The first surface of the positive electrode is laser-cleaned to form a cleaning tank; Inkjet printing: Ink is sprayed into the formed cleaning tank to fill the cleaning tank with adhesive; Curing: The adhesive in the cleaning tank is cured to form an adhesive frame; Die-cutting: The rolled positive electrode is die-cut. After die-cutting, the sum of the dimensions of the frame and the positive electrode sheet is consistent with the dimensions of the negative electrode sheet, and the position of the frame matches the negative electrode allowance area.

2. The inkjet mounting method for solid-state battery roll to positive electrode according to claim 1, characterized in that, During the inkjet printing process, the thickness of the adhesive is controlled to be 80%-100% of the depth of the cleaning tank opening; And / or, the viscosity of the adhesive is 20 cP-200 cP.

3. The inkjet mounting method for solid-state battery roll to positive electrode according to claim 1 or 2, characterized in that, During the laser cleaning process, the width of the cleaning tank opening is controlled to be 1mm-6mm. And / or, the groove depth is 20μm-110μm.

4. The inkjet mounting method for solid-state battery roll to positive electrode according to claim 3, characterized in that, During the preparation of the positive electrode coil, the foil at both ends in the width direction of the positive electrode is exposed. Multiple cleaning tanks formed by laser cleaning extend along the width direction and are spaced apart along the length direction.

5. The inkjet mounting method for solid-state battery roll to positive electrode according to claim 3, characterized in that, During the laser cleaning process, the laser type used is selected from MOPA pulsed fiber laser, composite laser, carbon dioxide laser, ultraviolet laser or continuous fiber laser; the laser pulse is nanosecond, picosecond or femtosecond.

6. The inkjet mounting method for solid-state battery roll to positive electrode according to claim 5, characterized in that, Picosecond lasers are used, with laser power controlled at 50W-300W, pulse frequency at 2000kHz-4000kHz, and scanning speed at 30000mm / s-60000mm / s.

7. The inkjet mounting method for solid-state battery roll to positive electrode according to claim 1, characterized in that, After curing and before die cutting, the second surface of the positive electrode opposite to the first surface is sequentially prepared for cleaning, laser cleaning, inkjet printing and curing.

8. The inkjet mounting method for solid-state battery roll to positive electrode according to claim 1, characterized in that, The pre-cleaning preparation steps also include: after being sent to the laser cleaning station, electrode correction, electrode positioning and electrode smoothing are performed in sequence; The electrode smoothing process involves using a negative pressure smoothing device to flatten the electrode. And / or, a negative pressure dust removal device may be used during laser cleaning.

9. The inkjet mounting method for solid-state battery roll to positive electrode according to claim 1, characterized in that, After laser cleaning, electrode positioning and electrode smoothing are performed sequentially. Specifically, the electrode positioning is used to align the processing position with the inkjet position; the electrode smoothing is achieved by using a negative pressure smoothing device to flatten the electrode. And / or, the adhesive is cured by ultraviolet light curing or drying curing.

10. The application of the inkjet mounting method for solid-state battery roll-to-roll positive electrode according to any one of claims 1-9 in the preparation of solid-state batteries.

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