Dry-method prime coat device and method for solid-state battery pole piece

Abstract

The invention discloses a solid-state battery pole piece dry method prime coat device and method, and belongs to the field of solid-state battery pole piece processing. The invention discloses a dry-method prime coating device for a solid-state battery pole piece. The dry-method prime coating device comprises a light foil unwinding module, a light foil pretreatment module, a plasma powder generation module, a plasma powder guide module, a dry-method coating unit and a prime coating pole piece winding unit, the light foil pretreatment module is arranged between the light foil unwinding module and the dry-method coating unit and is used for treating the surface of the light foil so as to improve the bonding performance of the light foil and coating powder; according to the method, the surface of the light foil is pretreated, so that the roughness and the surface area of the surface of the light foil are greatly increased through the formed concave-convex structure, more attachment points are provided for subsequently coated plasma powder, and the mechanical binding force between the plasma powder and the light foil is enhanced; and the probability that the coating falls off, is layered and the like in the use process is reduced, so that the production quality of the pole piece is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of solid-state battery electrode sheet processing, and particularly to a dry bottom coating device and method for solid-state battery electrode sheets. Background Art

[0002] As an important development direction of next-generation battery technology, solid-state batteries have significant advantages such as high energy density and high safety. The electrode sheet, as one of the core components of solid-state batteries, its quality and performance directly affect the overall performance of the battery. During the manufacturing process of the electrode sheet, the bottom coating process is crucial for improving the bonding strength between the electrode sheet and the active material layer and for improving the charge and discharge performance of the battery.

[0003] When the current dry bottom coating device for solid-state battery electrode sheets performs bottom coating on the electrode sheet, it directly coats on the surface of the light foil. The adhesion between the powder and the light foil is poor, which may cause the coating to fall off or uneven coating, thus possibly directly affecting the production quality and stability of the electrode sheet. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a dry bottom coating device and method for solid-state battery electrode sheets that can overcome or at least partially solve the above problems.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A dry bottom coating device for solid-state battery electrode sheets includes a light foil unwinding module, a light foil pretreatment module, a plasma powder generation module, a plasma powder guiding module, a dry coating unit, and a bottom-coated electrode sheet winding unit; the light foil pretreatment module is disposed between the light foil unwinding module and the dry coating unit, and the light foil pretreatment module is used to treat the surface of the light foil to improve its bonding performance with the coating powder; the plasma powder generation module is used to generate plasma powder; the plasma powder guiding module is used to guide the plasma powder to the surface of the light foil; the dry coating unit is used to uniformly coat the plasma powder on the light foil; and the bottom-coated electrode sheet winding unit is used to wind the electrode sheet after the bottom coating is completed.

[0007] In order to make the light foil have an uneven surface and improve the coating effect of the plasma powder, further, the light foil pretreatment module includes a laser pretreatment device, and the laser pretreatment device is used to emit a laser beam to scan the surface of the light foil, so that the surface of the light foil forms an uneven structure conducive to powder adhesion, and the laser pretreatment device can adjust the wavelength, energy density, pulse frequency, and scanning speed of the laser.

[0008] Preferably, when the copper foil is processed by the laser pretreatment device, the laser wavelength of the laser pretreatment device is set to 532 nm, the energy density ranges from 1 to 5 J / cm 2 , the pulse frequency is 10 - 100 kHz, and the scanning speed is 100 - 500 mm / s; when processing the aluminum foil, the laser wavelength is set to 1064 nm, and the energy density ranges from 0.5 to 3 J / cm 2 , the pulse frequency is 20 - 150 kHz, and the scanning speed is 150 - 600 mm / s.

[0009] Preferably, the plasma powder generation module includes a high - voltage plasma generation device, and the plasma powder guiding module includes a magnetic field guiding device. The high - voltage plasma generation device forms the coating powder into a plasma state by applying a high voltage, and the magnetic field guiding device is used to generate a magnetic field with a specific direction and intensity to guide the plasma powder to deposit on the surface of the light foil.

[0010] Further, the high - voltage plasma generation device includes a high - voltage power supply, a discharge electrode, and a grounding electrode. The voltage output by the high - voltage power supply ranges from 5 to 20 kV. The discharge electrode adopts a needle - shaped or filament - shaped structure, and the grounding electrode is at the same potential or close to the potential of the light foil.

[0011] For the convenience of guiding the plasma powder, preferably, the magnetic field guiding device includes an electromagnet array. The electromagnet array can independently control the magnitude and direction of the current of each electromagnet to adjust the distribution and intensity of the magnetic field, so that the plasma powder is evenly deposited on the surface of the light foil.

[0012] Preferably, the dry coating unit includes a powder delivery system, a coating die head, a gas circulation system, a turbulence module, and a plasma powder monitoring module. The powder delivery system transports the powder to the plasma powder circulation cavity through a powder supply pipeline. The powder delivery system is used to transport the plasma powder to the coating die head. The coating die head is used to evenly coat the plasma powder on the surface of the light foil, and the gas circulation system is used to maintain the stability and cleanliness of the coating environment.

[0013] To facilitate the generation of uniformly distributed plasma powder, further, the turbulence module includes an air flow distribution plate and a powder - homogenizing cavity arranged inside the coating die head. The air flow distribution plate is used to evenly distribute the gas entering the die head, and the powder - homogenizing cavity is used to fully mix and disperse the plasma powder in the die head to ensure the uniformity of coating.

[0014] To facilitate improving the winding effect of the primer-coated electrode sheet and detecting the electrode sheet, further, the primer-coated electrode sheet winding unit includes a tension control module and a quality detection module. The tension control module is used to maintain a constant tension of the electrode sheet during the winding process to prevent the electrode sheet from wrinkling or stretching and deforming. The quality detection module is used to detect coating defects on the surface of the primer-coated electrode sheet in real time, such as uneven thickness, powder agglomeration, etc., and feedback to the control system to adjust the process parameters.

[0015] A dry coating method for a solid-state battery electrode sheet mainly includes the following steps:

[0016] Step 1: Use the light foil unwinding module to gradually unwind the rolled light foil to provide continuous light foil material for subsequent processing, and ensure that the light foil remains flat and has stable tension during transportation;

[0017] Step 2: After the light foil is transported to the light foil pretreatment module, its surface is pretreated;

[0018] Step 3: The plasma generation module makes the powder form a plasma state;

[0019] Step 4: Guide the plasma powder to the pretreated light foil through the plasma powder guiding module and perform coating through the dry coating unit;

[0020] Step 5: The primer-coated electrode sheet winding unit winds the coated electrode sheet.

[0021] Compared with the prior art, the present invention provides a dry coating device for a solid-state battery electrode sheet, which has the following beneficial effects:

[0022] 1. For this dry coating device for a solid-state battery electrode sheet, by pretreating the light foil, the adhesion effect of the plasma powder can be increased, the occurrence of coating peeling and unevenness can be reduced, and thus the production quality of the electrode sheet can be effectively improved. The adjustable parameter laser pretreatment device can accurately control the effect of the laser according to different light foil materials and production requirements. The formed concave-convex structure greatly increases the roughness and surface area of the light foil surface, provides more attachment points for the subsequent coated plasma powder, enhances the mechanical bonding force between the plasma powder and the light foil, and reduces the probability of problems such as coating peeling and delamination during use, thereby effectively improving the production quality of the electrode sheet.

[0023] 2. For this dry coating device for a solid-state battery electrode sheet, through the method of high-voltage ionization, it can not only meet the requirements of powder ionization but also ensure the safety and stability of the equipment, improve the efficiency and quality of plasma powder generation, and high-voltage ionization can reduce the volume of the equipment to a certain extent.

[0024] 3. The dry bottom coating device for the solid-state battery electrode sheet. The air flow distribution plate makes the gas entering the die head evenly distributed, providing a good air flow environment for the uniform transportation of the plasma powder, avoiding the problem of uneven powder distribution caused by uneven gas flow. The powder homogenizing chamber further enables the full mixing and dispersion of the plasma powder, ensuring the uniformity of the powder concentration and distribution at the outlet of the coating die head. This can effectively improve the coating uniformity, make the coating thickness of the electrode sheet more consistent, and improve the quality and performance of the electrode sheet.

[0025] For the parts not involved in this device, they are the same as the prior art or can be implemented using the prior art. By pre-treating the surface of the light foil, the formed concave-convex structure greatly increases the roughness and surface area of the light foil surface, providing more attachment points for the subsequent coated plasma powder, enhancing the mechanical bonding force between the plasma powder and the light foil, reducing the probability of problems such as coating peeling and delamination during use, and thus effectively improving the production quality of the electrode sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is the working flow chart of the present invention;

[0027] Figure 2 is the working flow chart of the dry coating unit in the present invention;

[0028] Figure 3 is the working flow chart of the bottom-coated electrode sheet winding unit in the present invention;

[0029] Figure 4 is the working schematic diagram of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0031] Embodiment 1: Refer to Figures 1-4 , a dry bottom coating device for a solid-state battery electrode sheet, including a light foil unwinding module, a light foil pretreatment module, a plasma powder generation module, a plasma powder guiding module, a dry coating unit, and a bottom-coated electrode sheet winding unit; the light foil pretreatment module is arranged between the light foil unwinding module and the dry coating unit, and the light foil pretreatment module is used to treat the surface of the light foil to improve its bonding performance with the coated powder; the plasma powder generation module is used to generate plasma powder; the plasma powder guiding module is used to guide the plasma powder to the surface of the light foil; the dry coating unit is used to uniformly coat the plasma powder on the light foil; the bottom-coated electrode sheet winding unit is used to wind the bottom-coated electrode sheet.

[0032] In a specific embodiment, when performing dry bottom coating on a solid-state battery electrode sheet, the light foil unwinding module gradually unwinds the rolled light foil for unwinding and conveying. The light foil pretreatment module is located between the light foil unwinding module and the dry coating unit. When the light foil passes through, its surface is treated to form a surface conducive to plasma powder deposition. The plasma powder generation module operates to generate plasma powder for coating. Then, the plasma powder guiding module guides the generated plasma powder to the surface of the light foil at the dry coating unit. The dry coating unit evenly coats the plasma powder on the light foil to form a bottom coating. Finally, the bottom-coated electrode sheet winding unit winds up the electrode sheet that has completed the bottom coating. By pretreating the light foil, the adhesion effect of the plasma powder can be increased, reducing the occurrence of coating peeling and unevenness, and effectively improving the production quality of the electrode sheet.

[0033] Example 2: Refer to Figures 1-4 , a dry bottom coating device for a solid-state battery electrode sheet, which is basically the same as that in Example 1. Further, the light foil pretreatment module includes a laser pretreatment device. The laser pretreatment device is used to emit a laser beam to scan the surface of the light foil, so as to form an uneven structure on the surface of the light foil that is conducive to powder adhesion. The laser pretreatment device can adjust the wavelength, energy density, pulse frequency, and scanning speed of the laser.

[0034] When using the laser pretreatment device to process copper foil, the laser wavelength of the laser pretreatment device is set to 532 nm, and the energy density ranges from 1 to 5 J / cm 2 , the pulse frequency is 10 - 100 kHz, and the scanning speed is 100 - 500 mm / s; when processing aluminum foil, the laser wavelength is set to 1064 nm, and the energy density ranges from 0.5 to 3 J / cm 2 , the pulse frequency is 20 - 150 kHz, and the scanning speed is 150 - 600 mm / s.

[0035] The laser pretreatment device in the light foil pretreatment module is turned on. The operator adjusts the wavelength, energy density, pulse frequency, and scanning speed of the laser according to the material of the light foil and other conditions. The laser pretreatment device emits a laser beam to scan the surface of the passing light foil. With the action of the laser, the material on the surface of the light foil undergoes processes such as vaporization and melting at high temperature, and after cooling, an uneven structure conducive to powder adhesion is formed.

[0036] When copper foil needs to be processed, the operator sets the laser wavelength of the laser pretreatment device to 532 nm, adjusts the energy density to within the range of 1 - 5 J / cm 2 , sets the pulse frequency to 10 - 100 kHz, and sets the scanning speed to 100 - 500 mm / s. The laser beam scans the surface of the copper foil according to these parameters.

[0037] When processing aluminum foil, the laser wavelength is adjusted to 1064 nm, and the energy density is controlled at 0.5 - 3 J / cm 2 , the pulse frequency is set to 20 - 150 kHz, and the scanning speed is set to 150 - 600 mm / s for scanning processing.

[0038] Through the laser pretreatment device with adjustable parameters, the effect of the laser can be precisely controlled according to different light foil materials and production requirements. The formed concave-convex structure greatly increases the surface roughness and surface area of the light foil, provides more attachment points for the subsequent coated plasma powder, enhances the mechanical bonding force between the plasma powder and the light foil, reduces the probability of problems such as peeling and delamination of the coating during use, and thus effectively improves the production quality of the electrode.

[0039] Example 3: Refer to Figures 1-4 , a dry bottom coating device for a solid-state battery electrode, which is basically the same as Example 1. Further, the plasma powder generation module includes a high-voltage plasma generation device, and the plasma powder guiding module includes a magnetic field guiding device. The high-voltage plasma generation device forms a plasma state of the coating powder by applying a high voltage, and the magnetic field guiding device is used to generate a magnetic field with a specific direction and intensity to guide the plasma powder to deposit on the surface of the light foil.

[0040] The high-voltage plasma generation device includes a high-voltage power supply, a discharge electrode, and a grounding electrode. The voltage range output by the high-voltage power supply is 5 - 20 kV. The discharge electrode adopts a needle-shaped or filamentous structure, and the grounding electrode is at the same potential or close to the potential of the light foil.

[0041] The magnetic field guiding device includes an electromagnet array, and the electromagnet array can independently control the current magnitude and direction of each electromagnet to adjust the distribution and intensity of the magnetic field, so that the plasma powder is evenly deposited on the surface of the light foil.

[0042] The high-voltage plasma generation device in the plasma powder generation module is started, and the high-voltage power supply starts to work, applying a voltage of 5 - 20 kV to the discharge electrode. A strong electric field is formed between the discharge electrode and the grounding electrode. The discharge electrode can be set in a needle-shaped or filamentous structure. When the coating powder is fed into this electric field area, under the action of the high voltage, the molecules in the powder are ionized to form a plasma state. At the same time, the magnetic field guiding device in the plasma powder guiding module starts to operate, and the electromagnet array is energized to generate a magnetic field with a specific direction and intensity. The plasma powder is guided to the surface of the light foil along a predetermined trajectory under the action of the magnetic field force.

[0043] The method of high-voltage ionization can not only meet the requirements of powder ionization, but also ensure the safety and stability of the equipment, improve the efficiency and quality of plasma powder generation, and high-voltage ionization can reduce the volume of the equipment to a certain extent.

[0044] Example 4: Refer to Figures 1-4 , a dry bottom coating device for a solid-state battery electrode sheet, which is basically the same as Example 1. Further, the dry coating unit includes a powder conveying system, a coating die head, a gas circulation system, a turbulence module, and a plasma powder monitoring module. The powder conveying system transports the powder to the plasma powder circulation cavity through a powder supply pipeline. The powder conveying system is used to transport the plasma powder to the coating die head. The coating die head is used to uniformly coat the plasma powder on the surface of the light foil. The gas circulation system is used to maintain the stability and cleanliness of the coating environment.

[0045] The turbulence module includes an air flow distribution plate and a powder homogenizing cavity arranged inside the coating die head. The air flow distribution plate is used to evenly distribute the gas entering the die head. The powder homogenizing cavity is used to fully mix and disperse the plasma powder in the die head to ensure the uniformity of coating.

[0046] When the dry coating unit starts to work, the powder conveying system transports the plasma powder to the coating die head through the powder supply pipeline. The coating die head uniformly coats the received plasma powder on the surface of the pretreated light foil. At the same time, the gas circulation system in the turbulence module starts, and by continuously circulating the gas, it maintains the stability of the gas pressure, temperature, and cleanliness in the coating environment, preventing external impurities from entering and affecting the coating quality.

[0047] When the plasma powder and gas enter the coating die head, they first pass through the air flow distribution plate. The air flow distribution plate evenly disperses the entering gas, making the gas flow evenly in the die head. Then, the plasma powder enters the powder homogenizing cavity. Under the action of the powder homogenizing cavity, the powder is fully mixed and dispersed in the die head. The uniformly dispersed plasma powder is uniformly coated on the surface of the light foil from the outlet of the coating die head.

[0048] In specific work, the density of the plasma powder is monitored in real time through the plasma powder monitoring module.

[0049] The air flow distribution plate evenly distributes the gas entering the die head, providing a good air flow environment for the uniform transportation of the plasma powder, avoiding the problem of uneven powder distribution caused by uneven gas flow. The powder homogenizing cavity further fully mixes and disperses the plasma powder, ensuring the uniformity of the powder concentration and distribution at the outlet of the coating die head. This can effectively improve the uniformity of coating, make the coating thickness of the electrode sheet more consistent, and improve the quality and performance of the electrode sheet.

[0050] Example 5: Refer toFigures 1-4 , a dry bottom coating device for solid-state battery electrode sheets, which is basically the same as that in Embodiment 1. Further, the bottom-coated electrode sheet winding unit includes a tension control module and a quality detection module. The tension control module is used to maintain a constant tension of the electrode sheet during the winding process to prevent the electrode sheet from wrinkling or stretching deformation. The quality detection module is used to detect the coating defects on the surface of the bottom-coated electrode sheet in real time, such as uneven thickness, powder agglomeration, etc., and feedback to the control system to adjust the process parameters.

[0051] The coated electrode sheet is wound by the bottom-coated electrode sheet winding unit. The bottom-coated electrode sheet winding unit starts to work. The tension control module monitors the tension of the electrode sheet during the winding process in real time. When it detects a change in tension, the tension control module automatically adjusts the speed of the winding motor to maintain a constant tension of the electrode sheet. At the same time, the quality detection module starts to detect the surface of the bottom-coated electrode sheet in real time. Using optical or other detection means, it detects whether there are defects such as uneven thickness and powder agglomeration in the coating. Once a defect is detected, the quality detection module feeds the detection result back to the control system, and the control system adjusts the production process parameters in a timely manner according to the feedback information, such as adjusting the generation amount of plasma powder, coating speed, etc.

[0052] By maintaining a constant tension of the electrode sheet, the tension control module prevents problems such as wrinkling or stretching deformation of the electrode sheet during the winding process, ensuring the flatness and integrity of the electrode sheet. The real-time detection and feedback mechanism of the quality detection module can timely detect the defects in the coating and correct them by adjusting the process parameters, avoiding the large production of unqualified products, improving the product qualification rate and production efficiency, and reducing the production cost.

[0053] A dry bottom coating method for solid-state battery electrode sheets mainly includes the following steps:

[0054] Step 1: Use the light foil unwinding module to gradually unwind the rolled light foil to provide continuous light foil material for subsequent processing, ensuring that the light foil remains flat and has stable tension during transportation;

[0055] Step 2: After the light foil is transported to the light foil pretreatment module, its surface is pretreated;

[0056] Step 3: The plasma generation module forms the powder into a plasma state;

[0057] Step 4: Guide the plasma powder to the pretreated light foil through the plasma powder guiding module and perform coating through the dry coating unit;

[0058] Step 5: The bottom-coated electrode sheet winding unit winds the coated electrode sheet.

[0059] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, shall be covered by the protection scope of the present invention.

Claims

1. A solid-state battery electrode dry primer device, characterized in that: It includes a light foil unwinding module, a light foil pretreatment module, a plasma powder generating module, a plasma powder guiding module, a dry coating unit and a primer electrode winding unit; The light foil pretreatment module is arranged between the light foil unwinding module and the dry coating unit, and is used to treat the surface of the light foil to improve its bonding performance with the coating powder; The plasma powder generating module is used to generate plasma powder; The plasma powder guiding module is used to guide the plasma powder to the surface of the light foil; The dry coating unit is used to evenly coat the plasma powder on the plain foil; The primer-coated pole piece winding unit is used to wind up the pole piece that has been primer-coated.

2. A solid-state battery electrode dry primer device according to claim 1, characterized in that: The light foil pretreatment module includes a laser pretreatment device, which is used to emit a laser beam to scan the surface of the light foil, so that the surface of the light foil forms a concave-convex structure that is conducive to powder adhesion. The laser pretreatment device can adjust the wavelength, energy density, pulse frequency and scanning speed of the laser.

3. A solid-state battery electrode dry primer device according to claim 2, characterized in that: When the laser pretreatment device is used to treat copper foil, the laser wavelength of the laser pretreatment device is set to 532nm, and the energy density range is 1-5J / cm 2 , the pulse frequency is 10-100kHz, the scanning speed is 100-500mm / s; when processing aluminum foil, the laser wavelength is set to 1064nm, and the energy density range is 0.5-3J / cm 2 , pulse frequency is 20-150kHz, and scanning speed is 150-600mm / s.

4. A solid-state battery electrode dry primer device according to claim 1, characterized in that: The plasma powder generating module comprises a high voltage plasma generating device, and the plasma powder guiding module comprises a magnetic field guiding device. The high voltage plasma generating device forms a plasma state of the coated powder by applying a high voltage, and the magnetic field guiding device is used to generate a magnetic field of a specific direction and intensity to guide the plasma powder to be deposited on the surface of the light foil.

5. A solid-state battery electrode dry primer device according to claim 4, characterized in that: The high voltage plasma generating device comprises a high voltage power supply, a discharge electrode and a grounding electrode. The voltage outputted by the high voltage power supply is in the range of 5-20 kV. The discharge electrode adopts a needle-shaped or filament-shaped structure. The grounding electrode is at the same potential or close to the potential as the light foil.

6. A solid-state battery electrode dry primer device according to claim 4, characterized in that: The magnetic field guiding device comprises an electromagnet array, and the electromagnet array can independently control the current size and direction of each electromagnet to adjust the distribution and intensity of the magnetic field so that the plasma powder is uniformly deposited on the surface of the light foil.

7. A solid-state battery electrode dry primer device according to claim 1, characterized in that: The dry coating unit includes a powder conveying system, a coating die head, a gas circulation system, a turbulence module and a plasma powder monitoring module. The powder conveying system conveys powder to the plasma powder circulation cavity through a powder supply pipeline. The powder conveying system is used to convey plasma powder to the coating die head. The coating die head is used to evenly coat the plasma powder on the surface of the plain foil. The gas circulation system is used to maintain the stability and cleanliness of the coating environment.

8. A solid-state battery electrode dry primer device according to claim 7, characterized in that: The spoiler module includes an airflow distribution plate and a powder uniformity chamber arranged inside the coating die head. The airflow distribution plate is used to evenly distribute the gas entering the die head, and the powder uniformity chamber is used to fully mix and disperse the plasma powder in the die head to ensure the uniformity of coating.

9. A solid-state battery electrode dry primer device according to claim 1, characterized in that: The primer-coated pole piece winding unit includes a tension control module and a quality detection module. The tension control module is used to maintain a constant tension of the pole piece during the winding process to prevent the pole piece from wrinkling or stretching deformation. The quality detection module is used to detect coating defects on the surface of the primer-coated pole piece in real time, such as uneven thickness, powder agglomeration, etc., and feed back to the control system to adjust the process parameters.

10. A solid-state battery electrode dry primer method, characterized in that: The main steps include: Step 1: Use the foil unwinding module to gradually unwind the rolled foil to provide continuous foil material for subsequent processing, ensuring that the foil remains flat and has stable tension during transportation; Step 2: After the light foil is transported to the light foil pretreatment module, its surface is pretreated; Step 3: The plasma generating module forms the powder into a plasma state; Step 4: guiding the plasma powder onto the pre-treated light foil through the plasma powder guiding module, and coating it through the dry coating unit; Step 5: The primer-coated electrode sheet winding unit winds up the coated electrode sheet.

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