Agitating device, control method, agitating method, coating device, coating method, and storage medium

Abstract

This invention relates to the field of battery technology, and in particular to a stirring device, control method, stirring method, coating device, coating method, and storage medium. The stirring device includes a die head body, a driving component, a sensing component, and a control component. This invention innovatively uses stirring resistance as a core process parameter, and utilizes driving torque or current as a direct, measurable, and responsive proxy variable for the real-time viscosity and uniformity of the slurry. By controlling the rotation of the driving component through the output value of the sensing component, it can cope with viscosity fluctuations in the slurry, stabilize the stirring process, and save energy.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a stirring device, a control method, a stirring method, a coating device, a coating method, and a storage medium. Background Technology

[0002] On the pilot production line of all-solid-state batteries, the coating of solid electrolyte (sulfide, halide, oxide) slurries is a common challenge faced by our process engineers. To achieve high ionic conductivity, these slurries typically have extremely high solid content (>70%), extremely high viscosity (often exceeding 10,000 mPa·s), and complex rheological properties. In slot extrusion coating, they are prone to sedimentation, phase separation, and even the formation of irreversible soft gels in the low-speed zone of the die cavity.

[0003] Existing die head solutions with fixed stirring have a preset rotation speed, which cannot respond to real-time changes in the slurry's state. For example, when the slurry's viscosity increases due to slight solvent evaporation or batch differences, the fixed rotation speed may result in insufficient stirring, causing coating streaks; conversely, when the slurry has good fluidity, the fixed rotation speed may cause excessive shearing and ineffective energy consumption. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings and defects of the prior art by providing a stirring device, a control method, a stirring method, a coating device, a coating method, and a storage medium.

[0005] To achieve the above objectives, this application adopts the following solution: A stirring device, comprising: Die head body: used to stir electrolyte slurry; the die head body is provided with a cavity, slurry inlet and slurry outlet; a stirring shaft is provided inside the cavity; Drive component: includes a motor, the output end of which is connected to a stirring shaft inside the cavity to drive the stirring shaft to rotate; Sensing component: installed at the output end of the motor to sense the resistance experienced by the stirring shaft; Control unit: Connects the drive unit and the sensing unit, and controls the rotation of the drive unit based on the numerical feedback from the sensing unit.

[0006] The stirring shaft is equipped with a stirring paddle; when the electrolyte slurry is an oxide electrolyte slurry, the stirring paddle is an eccentric spiral ribbon paddle; when the electrolyte slurry is a sulfide electrolyte slurry, the stirring paddle is a perforated inclined blade paddle.

[0007] The sensing component is a torque sensor module or a high-precision current detection circuit. The control component is a PLC-based or embedded system controller with built-in control logic.

[0008] The present invention also includes a control method for a stirring device, which controls the rotation of a driving component based on the value feedback by a sensing component.

[0009] It includes the following steps: setting the upper limit T_max and lower limit T_min of the real-time torque of the sensing component; When the real-time torque T > T_max: the controller determines that the slurry is too thick or has gelled, and immediately stops or increases the motor speed to enhance the shear force; When T_min < T < T_max: the controller adopts the PID algorithm to smoothly adjust the speed with the torque to maintain homogenization; When T < T_min: it is determined that the slurry has excellent fluidity, and the motor can be instructed to maintain at a low speed or pause to save energy consumption.

[0010] The upper limit T_max of the torque is 60 - 70% of the rated torque of the motor; the lower limit T_min is 10 - 20% of the rated torque of the motor.

[0011] The present invention also includes a stirring method, which uses the above-mentioned stirring device and includes the following steps: inputting an electrolyte slurry into the die head main body, starting the driving component to stir; meanwhile, turning on the sensing component and the control component to obtain a uniform electrolyte slurry by stirring.

[0012] The control logic of the control component is: setting the upper limit T_max and lower limit T_min of the real-time torque of the sensing component; When the real-time torque T > T_max: the controller determines that the slurry is too thick or has gelled, and immediately stops or increases the motor speed to enhance the shear force; When T_min < T < T_max: the controller adopts the PID algorithm to smoothly adjust the speed with the torque to maintain homogenization; When T < T_min: it is determined that the slurry has excellent fluidity, and the motor is instructed to maintain at a low speed or pause to save energy consumption.

[0013] }Preferably, the upper limit T_max of the torque is 60 - 70% of the rated torque of the motor; the lower limit T_min is 10 - 20% of the rated torque of the motor.

[0014] The present invention also includes a stirring method, which uses the above-mentioned stirring device and includes the following steps: inputting an electrolyte slurry into the die head main body, starting the driving component to stir; meanwhile, turning on the sensing component and the control component, and controlling the driving component through the above-mentioned control method to obtain a uniform electrolyte slurry by stirring.

[0015] The present invention also includes a coating device for an electrolyte slurry, including: A storage tank: used to store the electrolyte slurry; Electrode back roller: Used to rotate the foil to the slurry outlet to coat the electrolyte slurry and obtain the electrode; The stirring device is described above; the slurry inlet of the stirring device is connected to the storage tank, and the slurry outlet is correspondingly set to the foil on the electrode back roller.

[0016] The present invention also includes a method for coating an electrolyte slurry, comprising the following steps: the electrolyte slurry in the storage tank is fed into the die head body of the stirring device through a pipeline; after being stirred by the stirring device, the electrolyte slurry is output from the slurry outlet to coat the foil on the electrode back roller to obtain an electrode.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention innovatively uses stirring resistance as a core process parameter, and utilizes driving torque or current as a direct, measurable, and responsive proxy variable for the real-time viscosity and uniformity of the slurry. By controlling the rotation of the driving component through the output value of the sensing component, it can cope with viscosity fluctuations in the slurry, stabilize the stirring process, and save energy. Attached Figure Description

[0018] Figure 1 This is an overall schematic diagram of the electrolyte slurry stirring device of the present invention; Figure 2 This is an overall schematic diagram of the electrolyte slurry coating apparatus of the present invention; Figure 3 This is a schematic diagram of the closed-loop control of the present invention. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0020] Figure 1 A stirring device is shown, comprising: Die head body 1: used for stirring electrolyte slurry; the die head body is provided with cavity 11, slurry inlet and slurry outlet; stirring shaft 12 is provided inside the cavity; Drive component: includes motor 16, the output end of which is connected to stirring shaft 12 inside the cavity to drive the stirring shaft to rotate; Sensing component 15: installed at the output end of the motor to sense the resistance experienced by the stirring shaft; Control unit 14: Connects the drive unit and the sensing unit, and controls the rotation of the drive unit by the numerical feedback from the sensing unit.

[0021] The stirring shaft is equipped with a stirring paddle 13; when the electrolyte slurry is an oxide electrolyte slurry, the stirring paddle is an eccentric spiral ribbon paddle; when the electrolyte slurry is a sulfide electrolyte slurry, the stirring paddle is a perforated inclined blade paddle.

[0022] The sensing component is a torque sensor module or a high-precision current detection circuit. The control component is a PLC-based or embedded system controller with built-in control logic.

[0023] The present invention also includes a control method that controls the rotation of a drive component by means of numerical feedback from a sensing component. This includes the following steps: setting the real-time torque upper limit T_max and lower limit T_min of the sensing component; When the real-time torque T > T_max: the controller determines that the slurry is too thick or gelation has occurred, and immediately stops or increases the motor speed to enhance the shear force; When T_min < T < T_max: the controller uses a PID algorithm to smoothly adjust the speed with torque and maintain homogeneity; When T < T_min: the slurry has excellent fluidity, and the motor can be instructed to maintain or stop at low speed to save energy.

[0024] The upper limit of torque T_max is 60-70% of the rated torque of the motor; the lower limit T_min is 10-20% of the rated torque of the motor.

[0025] The present invention also includes a stirring method using the stirring device, comprising the following steps: inputting electrolyte slurry into the mold head body and starting the driving component to stir; simultaneously, turning on the sensing component and the control component, and controlling the driving component through the control method to stir and obtain a uniform electrolyte slurry.

[0026] Figure 2 The invention also includes an apparatus for coating an electrolyte slurry, comprising: Storage tank 2: Used to store electrolyte slurry; Electrode back roller 3: Used to rotate foil 4 to the slurry outlet to coat electrolyte slurry to obtain electrode 5; The electrolyte slurry stirring device is described above; the slurry inlet of the electrolyte slurry stirring device is connected to the storage tank, and the slurry outlet is correspondingly set to the foil on the electrode back roller.

[0027] The present invention also includes a method for coating an electrolyte slurry, using the coating apparatus, comprising the following steps: the electrolyte slurry in the storage tank is fed into the die head body of the electrolyte slurry stirring device through a pipeline; after being stirred by the stirring device, the electrolyte slurry is output from the slurry outlet to coat the foil on the electrode back roller to obtain an electrode.

[0028] The present invention also includes a storage medium storing computer-executable instructions for implementing the control method as described when executed by a computer.

[0029] The following will be described with specific embodiments.

[0030] Embodiment 1: A method for stirring an electrolyte slurry, using the stirring device as described, includes the following steps: input the electrolyte slurry into the die head body, and start the driving component for stirring; meanwhile, turn on the sensing component and the control component, and control the rotation of the driving component through the control method to stir and obtain a uniform electrolyte slurry. Figure 3 Show a schematic diagram of closed-loop control.

[0031] The specific steps of the control method are: set the upper limit T_max and the lower limit T_min of the real-time torque of the sensing component; When the real-time torque T > T_max: the controller determines that the slurry is too thick or has gelled, and immediately stops or increases the motor speed to enhance the shear force; When T_min < T < T_max: the controller adopts the PID algorithm to smoothly adjust the speed with the torque to maintain homogenization; When T < T_min: it is determined that the slurry has excellent fluidity, and the instruction is given to maintain or pause the motor at a low speed to save energy consumption.

[0032] Specifically in this embodiment: for the coating of sulfide (argyrodite type, such as LPSCl) electrolyte slurry: Configuration: experimental line, coating width 300 mm. The impeller is a perforated inclined blade impeller. Torque threshold: T_max = 2.5 N·m (corresponding to a slurry viscosity of about 12000 mPa·s), T_min = 0.8 N·m. Initial state: the motor stops.

[0033] Process: After the slurry is injected, the torque instantly rises to 3.0 N·m (>T_max), and the controller instructs the motor to start and run at 40 rpm. After about 15 seconds, the torque stabilizes at 1.5 N·m. The controller automatically adjusts the speed to 25 rpm for maintenance. Artificially simulate the feeding fluctuation (inject a small section of thicker slurry), the torque rises to 2.8 N·m, and the system automatically increases the speed to 45 rpm to respond, and returns after about 8 seconds.

[0034] Effect: Automatically adapts throughout the process. The obtained film layer is scanned by a surface density meter (β-ray), and the COV value is 1.6%.

[0035] Embodiment 2: The difference from Embodiment 1 is that it is used for the continuous coating of oxide (garnet type, such as LLZO) electrolyte slurry Configuration: Pilot production line, coating width 600mm. Eccentric twin-ribbon propeller is used. Control strategy: When torque exceeds 3.5 N·m, the speed increases linearly from 30 rpm, up to a maximum of 60 rpm.

[0036] Process: 8-hour continuous coating. Due to the slow evaporation of the solvent, the system monitored a gradual shift in the torque baseline from the initial 2.8 N·m to 3.8 N·m. Based on this, the controller slowly increased the average rotation speed from 35 rpm to 50 rpm, perfectly compensating for the increase in viscosity.

[0037] Results: The online thickness gauge showed that the film thickness range remained within ±2.0μm for 8 hours, and the areal density COV value remained stable at 1.7%.

[0038] Comparative Example: The difference from Example 1 is that a fixed-speed stirring mold head was used for the comparative test. Configuration: Same die head and slurry (LPSCl) as in Example 1. The stirring motor was set to a fixed 35 rpm for continuous operation (this is an empirical value, intended to account for general conditions). Process and Issues: 1. Start-up stage: When the slurry is initially injected, the stirring torque at a fixed 35 rpm is 4.5 N·m (which exceeds the motor's safety margin). The motor overheats severely, making it difficult to start. In the initial stage of coating, streaks appear due to uneven mixing.

[0039] 2. Stabilization stage: When the slurry is homogenized, the torque drops to 1.2 N·m, but the motor still runs at 35 rpm, causing unnecessary energy consumption and slurry temperature rise (monitored temperature rise is about 4℃).

[0040] 3. Disturbance resistance test: When injecting the same high-viscosity slurry, the fixed speed could not cope, the torque soared to 5.0 N·m, the motor overload alarm was triggered, and the coating showed obvious abnormal thickness bands.

[0041] Results: The surface density COV of the coated film is 3.2%, and the film layer has periodic light and dark stripes that are visible to the naked eye.

[0042] Performance test results Table 1 shows the comparison data of key performance indicators between the embodiments of the present invention and the comparative examples.

[0043] Table 1

[0044] Test data shows that the closed-loop adaptive control stirring method of the present invention has a certain effect on improving the stability of coating surface density.

[0045] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of the equivalents of the claims be included within the invention.

[0046] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A stirring device, characterized in that, include: Die head body: used to stir electrolyte slurry; the die head body is provided with a cavity, slurry inlet and slurry outlet; A stirring shaft is installed inside the cavity; Drive component: includes a motor, the output end of which is connected to a stirring shaft inside the cavity to drive the stirring shaft to rotate; Sensing component: installed at the output end of the motor to sense the resistance experienced by the stirring shaft; Control unit: Connects the drive unit and the sensing unit, and controls the rotation of the drive unit based on the numerical feedback from the sensing unit.

2. The stirring device according to claim 1, characterized in that, The stirring shaft is equipped with a stirring paddle; when the electrolyte slurry is an oxide electrolyte slurry, the stirring paddle is an eccentric spiral ribbon paddle; when the electrolyte slurry is a sulfide electrolyte slurry, the stirring paddle is a perforated inclined blade paddle.

3. The stirring device according to claim 1, characterized in that, The sensing component is a torque sensor sensing module or a high-precision current detection circuit; preferably, the control component is a PLC-based or embedded system controller with built-in control logic.

4. A control method for the stirring device according to any one of claims 1-3, characterized in that, The rotation of the component is driven by numerical control based on feedback from the sensing component.

5. The control method according to claim 4, characterized in that, The steps include: setting the real-time torque upper limit T_max and lower limit T_min of the sensing component; When the real-time torque T > T_max: the controller determines that the slurry is too thick or gelation has occurred, and immediately stops or increases the motor speed to enhance the shear force; When T_min < T < T_max: the controller uses a PID algorithm to smoothly adjust the speed with torque and maintain homogeneity; When T < T_min: the slurry has excellent fluidity, and the motor can be instructed to maintain or stop at low speed to save energy.

6. The control method according to claim 5, characterized in that, The upper limit of torque T_max is 60-70% of the rated torque of the motor; the lower limit T_min is 10-20% of the rated torque of the motor.

7. A stirring method, characterized in that, Using the stirring device according to any one of claims 1-3 includes the following steps: inputting electrolyte slurry into the mold head body and starting the driving component to stir; simultaneously, turning on the sensing component and the control component, and controlling the driving component by the control method according to any one of claims 3-6 to stir and obtain a uniform electrolyte slurry.

8. A coating apparatus for an electrolyte slurry, characterized in that, include: Storage tank: Used to store electrolyte slurry; Electrode back roller: Used to rotate the foil to the slurry outlet to coat the electrolyte slurry and obtain the electrode; The stirring device according to any one of claims 1-3; the slurry inlet of the stirring device is connected to the storage tank, and the slurry outlet is correspondingly arranged with the foil on the electrode back roller.

9. A method for coating an electrolyte slurry, characterized in that, Using the coating apparatus of claim 8, the process includes the following steps: electrolyte slurry in a storage tank is fed into the die head body of an electrolyte slurry stirring device via a pipeline; after being stirred by the stirring device, electrolyte slurry is output from the slurry outlet to coat the foil on the electrode back roller to obtain an electrode.

10. A storage medium, characterized in that, The device stores computer-executable instructions, which, when executed by a computer, implement the control method as described in any one of claims 4-6.

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