Tension control method for multi-axis unwinding of solid-state battery and roller press
By using a multi-axis unwinding tension control method, the tension of the electrode and solid electrolyte can be adjusted in real time, solving the problem of low tension control accuracy in traditional solid-state battery production and improving composite quality and battery performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-31
- Publication Date
- 2026-03-10
AI Technical Summary
In the traditional solid-state battery production process, the composite tension control precision of the electrode and solid electrolyte is low, resulting in poor composite quality and affecting battery performance.
A multi-axis unwinding tension control method is adopted. By acquiring the width information of the battery cell material, the rated tension is determined, and the actual tension is collected in real time to form a closed-loop control. The tension of the electrode and the solid electrolyte is adjusted independently. The tension adjustment mechanism is used to achieve stable tension and ensure symmetry and synchronization in the compounding process.
This improves the tension control precision between the electrode and the solid electrolyte, avoids over-tensioning or under-tensioning, ensures composite quality, and enhances battery performance and production efficiency.
Smart Images
Figure CN121625520A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of solid-state battery production technology, specifically to a tension control method and a roller press for multi-axis unwinding of solid-state batteries. Background Technology
[0002] Solid-state batteries have advantages such as high energy density, good safety, and long cycle life, and have broad application prospects in new energy vehicles, energy storage systems, and other fields. The core structure of a solid-state battery includes battery electrodes and a solid electrolyte coated on both sides of the battery electrodes. The solid electrolyte needs to be composited with the electrodes to form a stable interfacial contact.
[0003] In the production process of solid-state batteries, electrodes and solid electrolytes are typically produced using a roll-to-roll method. This involves the electrodes being unwound from the unwinding device, undergoing tension control, alignment, lamination, and rolling processes, before finally being wound into the finished product. Tension control is one of the key factors affecting the quality of the lamination process. In traditional solid-state battery production, the low precision of tension control during electrode-solid electrolyte lamination leads to uneven coating thickness and poor lamination quality, impacting battery performance. In particular, tension mismatch or excessive fluctuations between the electrodes and solid electrolyte can cause defects such as wrinkles, bubbles, and delamination at the lamination interface, severely affecting battery performance and safety. Summary of the Invention
[0004] In view of this, the present invention provides a tension control method and a rolling mill for multi-axis unwinding of solid-state batteries, in order to solve the problem of low tension control accuracy of electrode and solid electrolyte composite in the prior art, which leads to poor composite quality and affects battery performance.
[0005] In a first aspect, the present invention provides a tension control method for multi-axis unwinding of a solid-state battery, the solid-state battery comprising battery cell material, the tension control method comprising: Obtain the width information of the battery cell material; Based on the width information, determine the rated tension information of the battery cell material; Collect the actual tension information of the battery cell material, and determine the tension adjustment information of the battery cell material based on the rated tension information and the actual tension information of the cell material. The tension control device adjusts the tension of the battery cells based on the tension adjustment information of the cells. Beneficial effects: Sheets of different widths will produce different stress distributions under the same tension. Determining the rated tension by using width information can effectively avoid material deformation or slippage caused by over-tensioning or under-tensioning, which would affect the judgment of rated tension information. By collecting the actual tension in real time and comparing it with the rated tension, a closed-loop control can be formed, which can quickly compensate for tension fluctuations, so that the sheet material can always maintain stable tension during the composite process, improve the composite quality, and thus improve battery performance.
[0006] In one alternative embodiment, the battery cell material includes electrode sheets; Based on the rated tension information and actual tension information of the battery cells, the tension adjustment information of the battery cells is determined, including: Extract the rated tension information of the electrode sheet from the rated tension information of the sheet material, and obtain the actual tension information of the electrode sheet; Tension analysis is performed based on the rated tension information and the actual tension information of the electrode to obtain the tension difference of the electrode; Tension adjustment analysis is performed based on the tension difference of the electrodes to determine the tension adjustment information of the sheet material.
[0007] Beneficial effects: Due to the different properties of the electrode and the solid electrolyte material, different tension settings are required. Independent extraction can achieve targeted control, calculate the electrode tension difference separately, avoid interference from tension fluctuations of other materials, improve response speed, and the electrode tension can be adjusted independently with a control accuracy of ±1N, which is much higher than the ±5N of the traditional method, greatly improving the electrode tension control accuracy.
[0008] In one optional embodiment, the battery cell material further includes a first solid electrolyte and a second solid electrolyte compounded on both sides of the electrode. Based on the rated tension information and actual tension information of the battery cells, the tension adjustment information of the battery cells is determined, including: Extract the rated tension information of the first solid electrolyte from the rated tension information of the sheet material, and obtain the actual tension information of the first solid electrolyte; Tension analysis is performed based on the rated tension information and the actual tension information of the first solid electrolyte to obtain the tension difference of the first solid electrolyte; Tension adjustment analysis is performed based on the tension difference of the first solid electrolyte to determine the tension adjustment information of the sheet material; And / or, Extract the rated tension information of the second solid electrolyte from the rated tension information of the sheet material, and obtain the actual tension information of the second solid electrolyte; Tension analysis is performed based on the rated tension information and actual tension information of the second solid electrolyte to obtain the tension difference of the second solid electrolyte. Tension adjustment analysis is performed based on the tension difference of the second solid electrolyte to determine the tension adjustment information of the sheet material.
[0009] Beneficial effects: Independent control of the solid electrolytes on both sides ensures symmetry during the composite process, avoids over- or under-tension on one side, and simultaneous adjustment on both sides maintains the synchronization between the solid electrolytes and the electrode, improves composite uniformity, and ensures composite quality.
[0010] In one optional implementation, determining the rated tension information of the battery cell material based on the width information includes: Extract electrode width information, first solid electrolyte width information, and second solid electrolyte width information from the width information of the battery cell material; Based on the electrode width information, determine the rated tension information of the electrode; Based on the width information of the first solid electrolyte, determine the rated tension information of the first solid electrolyte; Based on the width information of the second solid electrolyte, determine the rated tension information of the second solid electrolyte; Based on the rated tension information of the electrode, the rated tension information of the first solid electrolyte, and the rated tension information of the second solid electrolyte, the rated tension information of the sheet material is generated.
[0011] Beneficial effects: Since different materials have different optimal tensions, by extracting the width information of the electrode, the first solid electrolyte and the second solid electrolyte respectively, the corresponding rated tension can be determined, which can achieve targeted setting. Furthermore, the rated tension can be calculated independently according to its respective width, improving the control accuracy by 30%. Moreover, the tension coefficient of each material can be adjusted independently, which can adapt to different process requirements and has higher adaptability.
[0012] In one optional embodiment, the tension control device includes an electrode tension adjustment mechanism and two solid electrolyte tension adjustment mechanisms. The output directions of the electrode tension adjustment mechanism and the two solid electrolyte tension adjustment mechanisms intersect, so as to synchronously output the electrode, the first solid electrolyte and the second solid electrolyte to the rolling device according to a preset adaptive tension state. The tension control device adjusts the tension of the battery cells based on the tension adjustment information of the cells, specifically including: Based on the sheet tension adjustment information, determine the drive adjustment strategy information of the electrode tension adjustment mechanism; Based on the drive adjustment strategy information, the control electrode tension adjustment mechanism adjusts the tension of the electrode.
[0013] Beneficial effects: The output directions of the electrode tension adjustment mechanism and the two solid electrolyte tension adjustment mechanisms intersect, and the three axes intersect to ensure precise alignment of the composite position. The three axes output synchronously, avoiding tension fluctuations caused by speed differences. Furthermore, each axis can be adjusted independently without interfering with each other, thus improving control stability.
[0014] In one optional embodiment, the electrode tension adjustment mechanism includes: Tensioning rollers are installed on the belt path of the electrode sheets and are used to transport the electrode sheets. The first driving component is connected to the tension roller and is used to drive the tension roller to rotate; Based on the drive adjustment strategy information, the electrode tension adjustment mechanism is controlled to adjust the tension of the electrode, specifically including: When it is determined that the actual tension of the electrode is greater than the rated tension of the electrode, the first drive component is controlled to increase the rotation speed in order to reduce the tension of the electrode. When it is determined that the actual tension information of the electrode is less than the rated tension information of the electrode, the first drive component is controlled to reduce the rotation speed in order to increase the tension of the electrode. When it is determined that the actual tension information of the electrode is equal to the rated tension information of the electrode, the first drive component is controlled to maintain the current speed so that the tension of the electrode remains unchanged.
[0015] Beneficial effects: By driving the tension roller to change the rotation speed, the tension of the electrode sheet can be directly and quickly adjusted to stabilize it at the preset value. This achieves dynamic and automatic adjustment of the electrode sheet tension, with fast response speed and high control precision, effectively overcoming tension fluctuations caused by factors such as changes in roll diameter during unwinding.
[0016] In one optional implementation, the tension control device is controlled to adjust the tension of the battery cell material based on the sheet tension adjustment information, specifically including: Based on the sheet tension adjustment information, determine the tension adjustment strategy information of the solid electrolyte tension adjustment mechanism; Based on the tension adjustment strategy information, the solid electrolyte tension adjustment mechanism is controlled to adjust the tension of the solid electrolyte.
[0017] Beneficial effects: Based on the sheet tension adjustment information, the tension adjustment strategy information of the solid electrolyte tension adjustment mechanism is determined. When it is determined that the solid electrolyte tension is too high, the solid electrolyte tension adjustment mechanism is controlled to loosen the solid electrolyte. When it is determined that the solid electrolyte tension is too low, the solid electrolyte tension adjustment mechanism is controlled to tighten the solid electrolyte, thereby achieving efficient adjustment of the solid electrolyte tension.
[0018] In one optional embodiment, the solid electrolyte tension regulating mechanism includes: A floating roller is disposed on the conveyor path of the first solid electrolyte or the second solid electrolyte, and the first solid electrolyte or the second solid electrolyte is wound around the floating roller. The second driving component is used to drive the floating roller to move in order to tension or release the first solid electrolyte or the second solid electrolyte. Based on the tension adjustment strategy information, the solid electrolyte tension adjustment mechanism is controlled to adjust the tension of the solid electrolyte, specifically including: When it is determined that the actual tension information of the first solid electrolyte is greater than the rated tension information of the first solid electrolyte, or the actual tension information of the second solid electrolyte is greater than the rated tension information of the second solid electrolyte, the second driving component is controlled to drive the floating roller to move away from the first solid electrolyte or the second solid electrolyte, so as to reduce the tension of the first solid electrolyte or the second solid electrolyte. When it is determined that the actual tension information of the first solid electrolyte is less than the rated tension information of the first solid electrolyte, or the actual tension information of the second solid electrolyte is less than the rated tension information of the second solid electrolyte, the second driving component is controlled to drive the floating roller to move closer to the first solid electrolyte or the second solid electrolyte, so as to increase the tension of the first solid electrolyte or the second solid electrolyte.
[0019] Beneficial effects: By using floating rollers to adjust the tension of the first and second solid electrolytes, flexible control is achieved, avoiding material stretching damage and providing higher control precision.
[0020] In one optional embodiment, the tension control device is controlled to adjust the tension of the battery cell material based on the sheet tension adjustment information, specifically further including: Obtain the status information of the rolled battery cell material; Correct the rated tension information of the battery cell material based on its condition information; The drive adjustment strategy information of the electrode tension adjustment mechanism is determined based on the corrected rated tension information of the sheet material, and the tension of the electrode is adjusted based on the drive adjustment strategy information. Based on the drive adjustment strategy information, the tension adjustment strategy information of the solid electrolyte tension adjustment mechanism is determined, and the tension of the first solid electrolyte and / or the second solid electrolyte is adjusted based on the tension adjustment strategy information.
[0021] Beneficial effects: By automatically correcting the rated tension information of the composite battery cell material based on the quality feedback, and adjusting the tension of the electrode sheet according to the corrected rated tension information, the accuracy of electrode sheet tension adjustment is improved. Furthermore, based on the corrected drive adjustment strategy information and according to the preset correspondence, the tension adjustment strategy information of the solid electrolyte tension adjustment mechanism is determined, eliminating the need to determine the tension adjustment strategy information of the solid electrolyte tension adjustment mechanism by separately detecting the tension information of the solid electrolyte, further simplifying the steps and improving the tension adjustment efficiency.
[0022] Secondly, the present invention also provides a roller press that uses the tension control method for multi-axis unwinding of solid-state batteries according to any of the above embodiments to adjust the tension of the battery cell material. Attached Figure Description
[0023] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0024] Figure 1 This is a partial structural diagram of the roller press in an embodiment of the present invention; Figure 2 This is a partial structural schematic diagram of the tension control device in an embodiment of the present invention; Figure 3 for Figure 2 Enlarged view of the structure at point A in the middle; Figure 4 This is a partial structural schematic diagram of the solid electrolyte tension detection mechanism in an embodiment of the present invention; Figure 5 This is a flowchart illustrating one embodiment of the tension control method in this invention.
[0025] Explanation of reference numerals in the attached figures: 1. Electrode; 21. First solid electrolyte; 22. Second solid electrolyte; 3. Electrode tension detection mechanism; 31. Swinging roller; 32. First base; 33. Swing arm; 4. Electrode tension adjustment mechanism; 41. Tensioning roller; 5. Solid electrolyte tension detection mechanism; 51. Detection roller; 52. Detection roller fixing seat; 53. Second detection component; 54. Second base; 6. Solid electrolyte tension adjustment mechanism; 61. Floating roller; 62. Floating roller fixing seat; 63. Second drive component; 64. Third base; 641. Linear slide rail; 7. Roller pressing device; 8. Solid electrolyte unwinding device; 9. Electrode unwinding device. Detailed Implementation
[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0027] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0028] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0029] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
[0030] The following is combined Figures 1 to 5 The following describes embodiments of the present invention.
[0031] According to embodiments of the present invention, in one aspect, the present invention provides a tension control method for multi-axis unwinding of a solid-state battery, the solid-state battery comprising battery cell material, such as… Figure 1 As shown, the tension control method includes the following steps: S101: Obtain the width information of the battery cell material; S102: Determine the rated tension information of the battery cell material based on the width information; S103: Collect the actual tension information of the battery cell material, and determine the tension adjustment information of the battery cell material based on the rated tension information and the actual tension information of the cell material. S104: Control the tension control device to adjust the tension of the battery cells based on the sheet tension adjustment information. In the above embodiments, sheet materials of different widths will produce different stress distributions under the same tension. By determining the rated tension through the width information, the deformation or slippage of the material caused by over-tensioning or under-tensioning can be effectively avoided, which would affect the judgment of the rated tension information. By collecting the actual tension in real time and comparing it with the rated tension, a closed-loop control can be formed, which can quickly compensate for tension fluctuations, so that the sheet material always maintains a stable tension during the composite process, improves the composite quality, and thus improves the battery performance.
[0032] Based on the above embodiments, as a further defined implementation, in step S101, a laser rangefinder can be used to measure the sheet width in real time; in step S102, the rated tension information of the sheet is determined according to the width information, wherein the rated tension calculation formula is: rated tension = width of incoming material / 10.0 (N / 10mm); in step S103, a swing roller tension sensor can be used to detect the tension in real time, and a PID control algorithm can be used to determine the sheet tension adjustment information based on the rated tension and the actual tension.
[0033] In some embodiments, the battery cell material includes an electrode 1; determining the cell tension adjustment information based on the rated tension information and the actual tension information of the cell material includes the following steps: S201: Extract the rated tension information of the electrode sheet from the rated tension information of the sheet material, and obtain the actual tension information F of electrode sheet 1. 实际 ; S202: Based on the electrode rated tension information F 额定 Actual tension information F of electrode 1 实际 Tension analysis was performed to obtain the tension difference ΔF of electrode 1; S203: Based on the tension difference of electrode 1, perform tension adjustment analysis to determine the tension adjustment information of the sheet material.
[0034] In the above embodiments, since the electrode 1 and the solid electrolyte material have different properties, different tension settings are required. Independent extraction can achieve targeted control, calculate the tension difference of electrode 1 separately, avoid interference from tension fluctuations of other materials, improve response speed, and the tension of electrode 1 can be adjusted separately with a control accuracy of ±1N, which is much higher than ±5N of the traditional method, greatly improving the tension control accuracy of electrode 1.
[0035] Based on the above embodiments, as a further defined implementation, the actual tension information of electrode 1 is obtained. Specifically, an angle sensor can be used to detect the angle of the swing arm 33, and the actual tension can be obtained through the angle-tension conversion formula. Tension analysis is performed based on the rated tension and actual tension of electrode 1 to obtain the tension difference of electrode 1: ΔF = F 实际 - F 额定 Furthermore, regulation is initiated when |ΔF|>2N, with the regulation amount ΔV = Kp × ΔF + Ki ×∫ΔFdt + Kd ×dΔF / dt.
[0036] In some embodiments, the battery cell material further includes a first solid electrolyte 21 and a second solid electrolyte 22 composited on both sides of the electrode 1; determining the sheet tension adjustment information of the battery cell material based on the sheet material's rated tension information and actual sheet tension information includes: extracting the rated tension information of the first solid electrolyte from the sheet material's rated tension information and obtaining the actual tension information of the first solid electrolyte; performing tension analysis based on the first solid electrolyte's rated tension information and actual tension information to obtain the tension difference of the first solid electrolyte; and performing tension adjustment analysis based on the tension difference of the first solid electrolyte to determine the sheet material tension adjustment information. Extracting the rated tension information of the second solid electrolyte from the sheet material's rated tension information and obtaining the actual tension information of the second solid electrolyte; performing tension analysis based on the second solid electrolyte's rated tension information and actual tension information to obtain the tension difference of the second solid electrolyte; and performing tension adjustment analysis based on the tension difference of the second solid electrolyte to determine the sheet material tension adjustment information.
[0037] In the above embodiments, the solid electrolytes on both sides are controlled independently, which can ensure the symmetry of the composite process, avoid over-tensioning or under-tensioning on one side, and adjust both sides at the same time to maintain the synchronization of the solid electrolytes on both sides with electrode 1, improve the composite uniformity, and ensure the composite quality.
[0038] In some embodiments, determining the rated tension information of the battery cell material based on the width information includes the following steps: S301: Extract electrode width information, first solid electrolyte width information, and second solid electrolyte width information from the width information of the battery cell material; S302: Determine the rated tension information of the electrode based on the electrode width information; S303: Determine the rated tension information of the first solid electrolyte based on the width information of the first solid electrolyte; S304: Determine the rated tension information of the second solid electrolyte based on the width information of the second solid electrolyte; S305: Generate sheet rated tension information based on electrode rated tension information, first solid electrolyte rated tension information, and second solid electrolyte rated tension information.
[0039] In the above embodiments, since the optimal tension of different materials is different, the corresponding rated tension can be determined by extracting the width information of electrode 1, first solid electrolyte 21 and second solid electrolyte 22 respectively. This allows for targeted setting, and the rated tension can be calculated independently according to their respective widths, improving the control accuracy by 30%. Furthermore, the tension coefficient of each material can be adjusted independently, which can adapt to different process requirements and has higher adaptability.
[0040] In some embodiments, the tension control device includes an electrode tension adjustment mechanism 4 and two solid electrolyte tension adjustment mechanisms 6. The output directions of the electrode tension adjustment mechanism 4 and the two solid electrolyte tension adjustment mechanisms 6 intersect to synchronously output the electrode 1, the first solid electrolyte 21, and the second solid electrolyte 22 to the rolling device 7 according to a preset adaptive tension state.
[0041] The tension control device adjusts the tension of the battery cells based on the tension adjustment information of the cells, specifically including the following steps: S401: Determine the drive adjustment strategy information of the electrode tension adjustment mechanism 4 based on the sheet tension adjustment information; S402: Based on the drive adjustment strategy information, control the electrode tension adjustment mechanism 4 to adjust the tension of the electrode 1.
[0042] In the above embodiment, the output directions of the electrode tension adjustment mechanism 4 and the two solid electrolyte tension adjustment mechanisms 6 intersect, and the three axes intersect to ensure accurate alignment of the composite position. The three axes output synchronously to avoid tension fluctuations caused by speed differences. Each axis can be adjusted independently without interfering with each other, thus improving control stability.
[0043] In some embodiments, the electrode tension adjustment mechanism 4 includes a tension roller 41 and a first driving component. The tension roller 41 is disposed on the conveyor path of the electrode 1 and is used to convey the electrode 1. The first driving component is connected to the tension roller 41 and is used to drive the tension roller 41 to rotate.
[0044] Based on the drive adjustment strategy information, the electrode tension adjustment mechanism 4 is controlled to adjust the tension of the electrode 1, specifically including the following steps: S501: When it is determined that the actual tension information of electrode 1 is greater than the rated tension information of electrode 1, the first drive component is controlled to increase the rotation speed to reduce the tension of electrode 1; S502: When it is determined that the actual tension information of electrode 1 is less than the rated tension information of electrode 1, the first drive component is controlled to reduce the rotation speed in order to increase the tension of electrode 1; S503: When it is determined that the actual tension information of electrode 1 is equal to the rated tension information of electrode 1, the first drive component is controlled to maintain the current speed so that the tension of electrode 1 remains unchanged.
[0045] In the above embodiment, by driving the tension roller 41 to change the rotation speed, the tension of the electrode 1 can be directly and quickly adjusted to stabilize it at a preset value, realizing dynamic and automatic adjustment of the tension of the electrode 1. The response speed is fast and the control precision is high, effectively overcoming the tension fluctuation caused by factors such as changes in roll diameter during the unwinding process.
[0046] In some embodiments, controlling the tension control device to adjust the tension of the battery cell material according to the sheet tension adjustment information specifically includes the following steps: S601: Based on the sheet tension adjustment information, determine the tension adjustment strategy information of the solid electrolyte tension adjustment mechanism 6; S602: Based on the tension adjustment strategy information, control the solid electrolyte tension adjustment mechanism 6 to adjust the tension of the solid electrolyte.
[0047] In the above embodiments, the tension adjustment strategy information of the solid electrolyte tension adjustment mechanism 6 is determined based on the sheet tension adjustment information. When it is determined that the solid electrolyte tension is too large, the solid electrolyte tension adjustment mechanism 6 is controlled to loosen the solid electrolyte. When it is determined that the solid electrolyte tension is too small, the solid electrolyte tension adjustment mechanism 6 is controlled to tighten the solid electrolyte, thereby achieving efficient adjustment of the solid electrolyte tension.
[0048] In some embodiments, the solid electrolyte tension adjustment mechanism 6 includes a floating roller 61 and a second driving component 63. The floating roller 61 is disposed on the conveyor path of the first solid electrolyte 21 or the second solid electrolyte 22, and the first solid electrolyte 21 or the second solid electrolyte 22 is wound around the floating roller 61. The second driving component 63 is used to drive the floating roller 61 to move, so as to tension or loosen the first solid electrolyte 21 or the second solid electrolyte 22.
[0049] Based on the tension adjustment strategy information, the solid electrolyte tension adjustment mechanism 6 is controlled to adjust the tension of the solid electrolyte, specifically including the following steps: When it is determined that the actual tension information of the first solid electrolyte 21 is greater than the rated tension information of the first solid electrolyte 21, or the actual tension information of the second solid electrolyte 22 is greater than the rated tension information of the second solid electrolyte 22, the second driving component 63 is controlled to drive the floating roller 61 to move away from the first solid electrolyte 21 or the second solid electrolyte 22, so as to reduce the tension of the first solid electrolyte 21 or the second solid electrolyte 22. When it is determined that the actual tension information of the first solid electrolyte 21 is less than the rated tension information of the first solid electrolyte 21, or the actual tension information of the second solid electrolyte 22 is less than the rated tension information of the second solid electrolyte 22, the second driving component 63 is controlled to drive the floating roller 61 to move closer to the first solid electrolyte 21 or the second solid electrolyte 22, so as to increase the tension of the first solid electrolyte 21 or the second solid electrolyte 22.
[0050] In the above embodiments, by using a floating roller 61 to adjust the tension of the first solid electrolyte 21 and the second solid electrolyte 22, flexible control is achieved, avoiding material stretching damage and achieving higher control precision.
[0051] In some embodiments, controlling the tension control device to adjust the tension of the battery cell material based on the sheet tension adjustment information further includes the following steps: S701: Obtain the status information of the rolled battery cell material; S701: Corrects the rated tension information of the battery cell material based on the condition information of the cell material; S701: Determine the drive adjustment strategy information of the electrode tension adjustment mechanism 4 based on the corrected rated tension information of the sheet material, and adjust the tension of the electrode 1 based on the drive adjustment strategy information; S701: Based on the drive adjustment strategy information, determine the tension adjustment strategy information of the solid electrolyte tension adjustment mechanism 6, and adjust the tension of the first solid electrolyte and / or the second solid electrolyte based on the tension adjustment strategy information.
[0052] In the above embodiments, the rated tension information of the battery cell material is automatically corrected based on the quality feedback after composite battery cell material, and the tension of electrode 1 is adjusted according to the corrected rated tension information of the battery cell material, thereby improving the accuracy of the tension adjustment of electrode 1. Furthermore, the tension adjustment strategy information of the solid electrolyte tension adjustment mechanism is determined according to the corrected drive adjustment strategy information and the preset correspondence, eliminating the need to determine the tension adjustment strategy information of the solid electrolyte tension adjustment mechanism by separately detecting the tension information of the solid electrolyte, further simplifying the steps and improving the tension adjustment efficiency.
[0053] Specifically, the status information includes whether there are cracks or wrinkles in the battery cell material. This can be detected by taking pictures with a camera. If cracks are detected in the battery cell material, it indicates that the tension of the battery cell material is too high and needs to be reduced. If wrinkles are detected in the battery cell material, it indicates that the tension of the battery cell material is too low and needs to be increased.
[0054] According to an embodiment of the present invention, in another aspect, a roller press is provided, which uses the tension control method for multi-axis unwinding of solid-state batteries according to any of the above embodiments to adjust the tension of the battery cell material.
[0055] The roller press provided in this embodiment includes a conveyor station and a compounding station, as well as an unwinding device, a tension control device, a roller pressing device 7, a winding device, and a deviation correction device. The unwinding device includes an electrode unwinding device 9 and two sets of solid electrolyte unwinding devices 8. In the roller press, the electrode 1 and the solid electrolyte are unwound from their respective unwinding devices, passed through the tension control device, compounded at the compounding station, then entered the roller pressing device 7 for roller pressing, and finally wound up by the winding device. The tension control device plays a crucial role in the entire production process, ensuring stable tension of the electrode 1 and the solid electrolyte, avoiding problems such as poor compounding, wrinkles, and breakage caused by tension fluctuations, thereby improving product quality and production efficiency.
[0056] Specifically, the tension control device includes an electrode tension control device, a first solid electrolyte tension control device, and a second solid electrolyte tension control device. The electrode tension control device includes an electrode tension detection mechanism 3 and an electrode tension adjustment mechanism 4. The electrode tension detection mechanism 3 detects the first actual tension information of the electrode 1, and the electrode tension adjustment mechanism 4 adjusts the tension of the electrode 1 according to the first actual tension information. Both the first and second solid electrolyte tension control devices include a solid electrolyte tension detection mechanism 5 and a solid electrolyte tension adjustment mechanism 6. The solid electrolyte tension detection mechanism 5 detects the second actual tension information of the solid electrolyte, and the solid electrolyte tension adjustment mechanism 6 adjusts the tension of the solid electrolyte according to the second actual tension information. The output directions of the electrode tension control device, the first solid electrolyte tension control device, and the second solid electrolyte tension control device intersect, so as to synchronously output the electrode 1 and the two sets of solid electrolytes to the roller pressing device 7 according to a preset adaptive tension state. An electrode tension control device is located between the electrode unwinding device 9 and the rolling device 7. Specifically, the electrode tension detection mechanism 3 and the electrode tension adjustment mechanism 4 are sequentially located between the electrode unwinding device 9 and the rolling device 7. A first solid electrolyte tension control device and a second solid electrolyte tension control device are arranged side by side between the electrode unwinding device 9 and the rolling device 7, and are distributed on both sides of the electrode tension control device. Specifically, the solid electrolyte tension detection mechanism 5 and the solid electrolyte tension adjustment mechanism 6 are sequentially located between the electrode unwinding device 9 and the rolling device 7.
[0057] In some embodiments, the electrode tension detection mechanism 3 includes a swing roller 31, a first detection component, and a first analysis component. The swing roller 31 is disposed on the conveyor path of the electrode 1, and the electrode 1 is wound around the swing roller 31. The first detection component is used to detect the swing information of the swing roller 31, and the swing information includes the swing direction and the swing angle. The first analysis component is used to analyze the first actual tension information of the electrode 1 based on the swing information.
[0058] In the above embodiment, by utilizing information such as the swing direction and swing angle of the swing roller 31, the actual tension of the electrode 1 can be indirectly and accurately reflected. The structure is simple, the response is sensitive, and it can capture minute changes in the tension of the electrode 1 in real time, providing accurate data feedback for subsequent tension adjustment.
[0059] In some embodiments, the electrode tension detection mechanism 3 further includes a first base 32 and a swing arm 33, the upper end of the swing arm 33 being rotatably connected to the first base 32, and the lower end being rotatably mounted with a swing roller 31; the first detection component includes an angle sensor disposed between the first base 32 and the swing arm 33.
[0060] In the above embodiment, the swing roller 31 is connected to the first base 32 by the swing arm 33. When the tension of the electrode 1 changes, the swing roller 31 drives the swing arm 33 to rotate around the first base 32 by the angle sensor between the first base 32 and the swing arm 33. The angle sensor detects the swing angle of the swing arm 33 in real time. The first analysis component calculates the actual tension value of the electrode 1 based on the angle change, thereby making the detection of the swing angle of the swing roller 31 more stable and accurate, and improving the accuracy and reliability of tension detection.
[0061] In some embodiments, the electrode tension adjustment mechanism 4 includes a tension roller 41 and a first driving component. The tension roller 41 is disposed on the conveyor path of the electrode 1 and is located upstream of the swing roller 31. The electrode 1 is wound around the tension roller 41. The first driving component is connected to the tension roller 41 and is used to drive the tension roller 41 to rotate at different speeds according to the first actual tension information.
[0062] In the above embodiment, the tension roller 41 is used to convey the electrode 1. The first driving component can adjust the tension of the electrode 1 by controlling the rotation speed of the tension roller 41. When the tension of the electrode 1 is detected to be too large, the first driving component controls the tension roller 41 to accelerate its rotation and release the tension of the electrode 1. When the tension of the electrode 1 is detected to be too small, the first driving component controls the tension roller 41 to decelerate its rotation and increase the tension of the electrode 1.
[0063] Based on the above embodiments, as a further defined implementation, the first driving component may be a drive motor. The first actual tension information detected by the electrode tension detection mechanism 3 is compared with the preset first rated tension information to obtain a tension difference. The drive motor is controlled to adjust the tension according to the tension difference. For example, when the detected first actual tension information is greater than the preset first rated tension information, the speed of the drive motor is increased so that the tension roller 41 rotates faster to tension the electrode 1; when the detected first actual tension information is less than the preset first rated tension information, the speed of the first driving component is decreased so that the tension roller 41 rotates slower to loosen the electrode 1.
[0064] As an alternative implementation, the electrode tension adjustment mechanism 4 can be implemented using a floating roller 61 in conjunction with a cylinder or motor.
[0065] In some embodiments, the solid electrolyte tension detection mechanism 5 includes a detection roller 51, a detection roller fixing seat 52, a second detection component 53, and a second analysis component. The solid electrolyte is wound around the detection roller 51. The detection roller 51 is rotatably mounted on the detection roller fixing seat 52. The second detection component 53 is used to detect pressure change information of the detection roller fixing seat 52. The second analysis component is electrically connected to the second detection component 53 and is used to analyze the second actual tension information of the solid electrolyte based on the pressure change information. In the above embodiments, the pressure detection method is very suitable for tension measurement of thin film materials, and can accurately sense the changes in the tension of solid electrolytes, providing accurate tension feedback information for the control of solid electrolytes.
[0066] In some embodiments, the solid electrolyte tension detection mechanism 5 further includes a second base 54, a detection roller fixing seat 52 is mounted on the second base 54, and a second detection component 53 includes a pressure sensor disposed between the detection roller fixing seat 52 and the second base 54.
[0067] In the above embodiment, when the tension of the solid electrolyte changes, the detection roller 51 exerts pressure on the detection roller fixing seat 52. The pressure sensor detects the pressure change in real time, and the second analysis component calculates the actual tension value of the solid electrolyte based on the pressure change. The detection roller fixing seat is installed through the set base structure, and the second detection component 53 is set between the detection roller fixing seat 52 and the second base 54, making the second detection component 53 stable and reliable. Moreover, the second detection component 53 uses a pressure sensor, which has high accuracy, stable signal, and is easy to integrate into the control system, ensuring the accuracy and consistency of tension detection.
[0068] In some embodiments, there are two detection roller holders 52, which are installed at both ends of the second base 54, and two sets of pressure sensors are provided accordingly. In the above embodiment, the two ends of the detection roller 51 are rotatably mounted between the two detection roller fixing seats 52. Two pressure sensors are correspondingly set between the two detection roller fixing seats 52 and the second base 54. By adopting the method of supporting at both ends and setting two sets of pressure sensors, the dual-point detection structure can improve the stability and accuracy of tension detection, avoid the error caused by single-point detection, enhance the anti-interference ability of the tension detection system, and make the detection results more realistically reflect the average tension of the entire wide solid electrolyte sheet, thereby improving the uniformity and reliability of control.
[0069] In some embodiments, the solid electrolyte tension adjustment mechanism 6 includes a floating roller 61, a floating roller mounting base 62, and a second driving component 63. The floating roller 61 is disposed on the conveyor path of the solid electrolyte and is located upstream of the detection roller 51. The solid electrolyte is wound around the floating roller 61. The floating roller 61 is rotatably mounted on the floating roller mounting base 62. The second driving component 63 is connected to the floating roller mounting base 62 and is used to drive the floating roller mounting base 62 to move. In the above embodiments, when excessive tension of the solid electrolyte is detected, the second driving component 63 drives the floating roller fixing seat 62 to move away from the solid electrolyte, releasing the solid electrolyte tension; when insufficient tension of the solid electrolyte is detected, the second driving component 63 drives the floating roller fixing seat 62 to move closer to the solid electrolyte, increasing the solid electrolyte tension. By driving the floating roller fixing seat 62 to move, the length of the conveyor path of the solid electrolyte sheet is changed, thereby quickly adjusting the solid electrolyte tension. The adjustment method is simple, direct, and effective, and is particularly suitable for rapid and wide-range compensation adjustment of tension, with a rapid response.
[0070] In some embodiments, the solid electrolyte tension adjustment mechanism 6 includes a third base 64, on which a linear slide rail 641 is provided, a floating roller fixing seat 62 is slidably connected to the linear slide rail 641, and a second driving component 63 drives the floating roller fixing seat 62 to move along the linear slide rail 641.
[0071] In the above embodiments, the linear slide rail 641 can ensure the smoothness and straightness of the movement of the floating roller fixing seat 62, provide guidance and drive for the adjustment of the floating roller 61, ensure the smoothness of the solid electrolyte tension adjustment process, improve the tension adjustment accuracy, reduce shaking and jamming during the movement process, and improve the adjustment accuracy and service life of the device.
[0072] Specifically, a slider is fixedly installed at the bottom of the floating roller fixing seat 62. The floating roller fixing seat 62 is connected to the linear slide rail 641 through the slider. A cylinder or motor is installed between the floating roller fixing seat 62 and the third base 64 as a second driving component 63. When it is necessary to adjust the tension, the cylinder or motor drives the floating roller fixing seat 62 to move the floating roller 61, thereby adjusting the tension by changing the length of the solid electrolyte conveying path. The adjustment range is large and the response speed is fast.
[0073] It should be noted that the first driving component and the second driving component 63 can be any one of a servo motor, a stepper motor, a pneumatic cylinder, or a hydraulic cylinder. Servo motors and stepper motors are characterized by high control precision and fast response speed, and are suitable for high-precision tension control applications. Pneumatic cylinders and hydraulic cylinders are characterized by large output force and simple structure, and are suitable for high-tension control applications. Preferably, the first driving component is a servo motor or a stepper motor, and the second driving component 63 is a pneumatic cylinder.
[0074] In some embodiments, the roller press further includes a control circuit system, which includes a central control unit (PLC or industrial computer) electrically connected to the first detection component, the second detection component 53, the first drive component, and the second drive component 63, respectively. The control circuit system receives tension signals from each detection mechanism in real time, calculates control commands using a PID algorithm, and controls the electrode tension adjustment mechanism 4 and the solid electrolyte tension adjustment mechanism 6, respectively, to achieve coordinated control of the three-axis tension.
[0075] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the protection scope of the embodiments of this application.
Claims
1. A method for tension control of a multi-axis unwinding of a solid-state battery, characterized by, The solid-state battery comprises a battery sheet material, and the tension control method comprises: obtaining the width information of the battery sheet material; determining the sheet material rated tension information of the battery sheet material according to the width information; collecting the sheet material actual tension information of the battery sheet material, and determining the sheet material tension adjustment information of the battery sheet material based on the sheet material rated tension information and the sheet material actual tension information; controlling the tension control device to adjust the tension of the battery sheet material according to the sheet material tension adjustment information.
2. The method of claim 1, wherein, The battery sheet material comprises a pole sheet; The determination of the sheet material tension adjustment information of the battery sheet material based on the sheet material rated tension information and the sheet material actual tension information comprises: extracting the pole sheet rated tension information from the sheet material rated tension information, and obtaining the pole sheet actual tension information; performing tension analysis according to the pole sheet rated tension information and the pole sheet actual tension information to obtain a pole sheet tension difference value; performing tension adjustment analysis according to the pole sheet tension difference value to determine the sheet material tension adjustment information.
3. The method of claim 2, wherein the method further comprises: The battery sheet material further comprises a first solid-state electrolyte and a second solid-state electrolyte compounded on both sides of the pole sheet; The determination of the sheet material tension adjustment information of the battery sheet material based on the sheet material rated tension information and the sheet material actual tension information comprises: extracting the first solid-state electrolyte rated tension information from the sheet material rated tension information, and obtaining the first solid-state electrolyte actual tension information; performing tension analysis according to the first solid-state electrolyte rated tension information and the first solid-state electrolyte actual tension information to obtain a first solid-state electrolyte tension difference value; performing tension adjustment analysis according to the first solid-state electrolyte tension difference value to determine the sheet material tension adjustment information; and / or, extracting the second solid-state electrolyte rated tension information from the sheet material rated tension information, and obtaining the second solid-state electrolyte actual tension information; performing tension analysis according to the second solid-state electrolyte rated tension information and the second solid-state electrolyte actual tension information to obtain a second solid-state electrolyte tension difference value; performing tension adjustment analysis according to the second solid-state electrolyte tension difference value to determine the sheet material tension adjustment information.
4. The method of claim 3, wherein the method further comprises: The determination of the sheet material rated tension information of the battery sheet material according to the width information comprises: extracting the pole sheet width information, the first solid-state electrolyte width information and the second solid-state electrolyte width information from the width information of the battery sheet material; determining the pole sheet rated tension information according to the pole sheet width information; determining the first solid-state electrolyte rated tension information according to the first solid-state electrolyte width information; determining the second solid-state electrolyte rated tension information according to the second solid-state electrolyte width information; generating the sheet material rated tension information based on the pole sheet rated tension information, the first solid-state electrolyte rated tension information and the second solid-state electrolyte rated tension information.
5. The method of claim 1 to 4, wherein, The tension control device comprises a pole piece tension adjusting mechanism and two solid electrolyte tension adjusting mechanisms, and the output directions of the three are intersected to synchronously output the pole piece and the first and second solid electrolytes to the rolling device in a preset adaptive tension state. The tension control device is controlled according to the sheet tension adjusting information to adjust the tension of the battery sheet, specifically including: According to the sheet tension adjusting information, the driving adjustment strategy information of the pole piece tension adjusting mechanism is determined. According to the driving adjustment strategy information, the pole piece tension adjusting mechanism is controlled to adjust the tension of the pole piece.
6. The method of claim 5, wherein the method further comprises: The pole piece tension adjusting mechanism comprises: A tensioning roller is arranged on the running path of the pole piece and used to convey the pole piece; A first driving component is connected with the tensioning roller and used to drive the tensioning roller to rotate; According to the driving adjustment strategy information, the pole piece tension adjusting mechanism is controlled to adjust the tension of the pole piece, specifically including: When it is judged that the pole piece actual tension information is greater than the pole piece rated tension information, the rotation speed of the first driving component is increased to reduce the tension of the pole piece; When it is judged that the pole piece actual tension information is less than the pole piece rated tension information, the rotation speed of the first driving component is reduced to increase the tension of the pole piece; When it is judged that the pole piece actual tension information is equal to the pole piece rated tension information, the current rotation speed of the first driving component is kept to keep the tension of the pole piece unchanged.
7. The method of claim 5, wherein the method further comprises: The tension control device is controlled according to the sheet tension adjusting information to adjust the tension of the battery sheet, specifically including: According to the sheet tension adjusting information, the stretching adjustment strategy information of the solid electrolyte tension adjusting mechanism is determined. According to the stretching adjustment strategy information, the solid electrolyte tension adjusting mechanism is controlled to adjust the tension of the solid electrolyte.
8. The method of claim 7, wherein the method further comprises: The solid electrolyte tension adjusting mechanism comprises: A floating roller is arranged on the running path of the first or second solid electrolyte, and the first or second solid electrolyte is wound around the floating roller; A second driving component is used to drive the floating roller to move to tension or untension the first or second solid electrolyte; According to the stretching adjustment strategy information, the solid electrolyte tension adjusting mechanism is controlled to adjust the tension of the solid electrolyte, specifically including: When it is judged that the first solid electrolyte actual tension information is greater than the first solid electrolyte rated tension information or the second solid electrolyte actual tension information is greater than the second solid electrolyte rated tension information, the second driving component is controlled to drive the floating roller to move away from the first or second solid electrolyte to reduce the tension of the first or second solid electrolyte. When it is judged that the first solid-state electrolyte actual tension information is less than the first solid-state electrolyte rated tension information, or the second solid-state electrolyte actual tension information is less than the second solid-state electrolyte rated tension information, the second driving component is controlled to drive the floating roller to move in the direction of approaching the first solid-state electrolyte or the second solid-state electrolyte, so as to increase the tension of the first solid-state electrolyte or the second solid-state electrolyte.
9. The method of claim 5, wherein the method further comprises, The tension control device is controlled according to the sheet tension adjustment information to adjust the tension of the battery sheet, and specifically further comprises: acquiring state information of the rolled battery sheet; correcting the sheet rated tension information according to the state information of the battery sheet; determining the driving adjustment strategy information of the pole piece tension adjustment mechanism according to the corrected sheet rated tension information, and adjusting the tension of the pole piece based on the driving adjustment strategy information; determining the stretching adjustment strategy information of the solid-state electrolyte tension adjustment mechanism according to the driving adjustment strategy information, and adjusting the tension of the first solid-state electrolyte and / or the second solid-state electrolyte based on the stretching adjustment strategy information.
10. A roll press characterized by, The tension control method of the multi-axis unwinding of the solid-state battery is used to adjust the tension of the battery sheet.