Electrode slurry coating system and electrode slurry coating method

Abstract

The electrode slurry coating system of the present invention comprises: a supply duct as a transport path for transporting an electrode slurry from a supply tank to a coating mold; a mass flow meter installed on a path of the supply pipe for measuring a flow rate of the electrode slurry conveyed through the supply pipe and a density of the electrode slurry; and a control unit for calculating a load amount prediction value of the electrode slurry based on measurement information measured by the mass flow meter and for controlling the calculated load amount prediction value of the electrode slurry to satisfy the load amount management range.

Description

Technical Field

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2023-0124418, filed on September 19, 2023, the disclosure of which is incorporated herein by reference.

[0002] The present disclosure relates to an electrode slurry coating system and an electrode slurry coating method. Background Art

[0003] With the development of technology and the increasing demand for mobile devices, the demand for secondary batteries as energy sources has increased rapidly. Recently, the use of secondary batteries as power sources for electric vehicles (EVs) and hybrid electric vehicles (HEVs) has been realized. Among such secondary batteries, there is a great demand for lithium secondary batteries with high energy density, high discharge voltage and output stability.

[0004] In particular, lithium secondary batteries used as power sources for electric vehicles (EVs) and hybrid electric vehicles (HEVs) are required to exhibit characteristics of being able to exhibit a large output at a high energy density in a short time.

[0005] Generally, lithium secondary batteries use materials capable of intercalating and deintercalating lithium ions as negative and positive electrodes, and are manufactured by filling an organic electrolyte or a polymer electrolyte between the positive and negative electrodes, and when lithium ions undergo intercalation and deintercalation at the positive and negative electrodes, electrical energy is generated through redox reactions.

[0006] In this case, the negative electrode and the positive electrode include an electrode active material layer on a current collector of each electrode, and such electrodes can be prepared by mixing and stirring the electrode active material with a binder and a solvent, a desired conductive material, and a dispersant to prepare an electrode slurry, and then coating the electrode slurry on the current collector using a slot die coater, followed by drying and roll pressing.

[0007] During the coating process of the electrode slurry, in order to control the quality of the electrode, it is very important to manage the loading amount of the electrode slurry to make it uniform. Conventionally, in order to manage the loading amount of the electrode slurry, during the initial condition adjustment step of the coating process, the loading amount of the electrode slurry is measured, and the RPM (revolutions per minute; Rotation perMinute) of the motor is repeatedly adjusted many times until the measured loading amount of the electrode slurry meets the measurement range, and the measurement information obtained on the dried electrode using the grid gauge is converted and managed as the loading amount of the electrode slurry before drying. However, this method has the problem of significant material loss because the RPM adjustment of the motor needs to be repeated many times, and the change in the loading amount of the electrode slurry due to the change in flow rate caused by filter clogging or pump abnormality during the coating process can only be confirmed after the electrode drying process. In addition, since these methods cannot perform a comprehensive inspection, products that do not meet specifications may appear.

[0008] Therefore, there is a need for technical development of an electrode slurry coating system and method capable of managing the loading amount of the electrode slurry in real time. Summary of the Invention

[0009] Technical issues

[0010] The present disclosure aims to provide an electrode slurry coating system and an electrode slurry coating method that can reliably calculate a predicted value of the loading amount of the electrode slurry in real time during the coating process, and automatically control the loading amount so that the calculated predicted value meets the management range.

[0011] Technical Solution

[0012] According to one embodiment of the present disclosure, an electrode slurry coating system is provided. The electrode slurry coating system includes: a supply pipe connecting a supply tank for storing electrode slurry and a coating die for coating the electrode slurry on an electrode base substrate, the supply pipe being a conveying path for conveying the electrode slurry from the supply tank to the coating die; a mass flow meter installed on the path of the supply pipe and configured to measure the flow rate and density of the electrode slurry conveyed through the supply pipe; and a control unit configured to calculate a predicted value of the electrode slurry loading based on measurement information measured by the mass flow meter, and to control the calculated predicted value of the electrode slurry loading to satisfy a loading management range.

[0013] The electrode slurry coating system according to one embodiment further includes a pump configured to provide a driving force for delivering the electrode slurry to the coating die.

[0014] In one embodiment, the control unit includes a calculation unit that calculates a predicted value of the loading amount of the electrode slurry by substituting a value of the flow rate of the electrode slurry measured by a mass flow meter and a value of the density of the electrode slurry into the following Equation 1 and / or Equation 2.

[0015] [Equation 1]

[0016] Loading amount prediction value = [electrode slurry flow rate × {1-(density of solvent in electrode slurry / density of electrode slurry)}] / A

[0017] [Equation 2]

[0018] Loading amount prediction value = [electrode slurry flow rate × {electrode slurry solid content concentration / (electrode slurry coating width length × electrode slurry coating speed)}] + B

[0019] According to one embodiment, the electrode slurry coating system further includes a loading amount measuring instrument for measuring the loading amount of the electrode slurry coated on the electrode, wherein the calculation unit can be configured to calculate the correction constant A of Equation 1 based on the loading amount measurement value of the electrode slurry measured by the loading amount measuring instrument and the loading amount prediction value of the electrode slurry calculated by substituting it into Equation 1 when the correction constant A is not determined.

[0020] In one embodiment, the control unit controls to adjust the RPM (rotation per minute) of the pump until the calculated predicted value of the loading amount of the electrode slurry satisfies the loading amount management range.

[0021] In one embodiment, the control unit controls to start or continue the electrode coating process when the calculated predicted value of the loading amount of the electrode slurry meets the loading amount management range.

[0022] The control unit controls to generate a warning sound when the calculated predicted value of the loading amount of the electrode slurry does not satisfy the loading amount management range.

[0023] The electrode slurry coating system according to one embodiment further includes a human-machine interface (HMI) for communicating with the control unit.

[0024] According to another embodiment of the present invention, an electrode slurry coating method is provided. The electrode slurry coating method includes: (a) setting a coating process condition according to an electrode model; (b) setting a pump RPM; (c) testing the coating of the electrode slurry on an electrode base substrate according to the set coating process condition; (d) determining whether a predicted value of the electrode slurry loading meets a management range of the electrode slurry loading; and (e) if it is determined to meet the requirements in the determination process, starting a coating process to coat the electrode slurry, wherein (c) testing the coating of the electrode slurry includes: (c-1) measuring a flow rate of the electrode slurry and a density of the electrode slurry; and (c-2) calculating a predicted value of the electrode slurry loading based on the measurement information.

[0025] In one embodiment, in (c-1) measuring the flow rate of the electrode slurry and the density of the electrode slurry, the flow rate of the electrode slurry and the density of the electrode slurry are measured by a mass flow meter installed on a path of the supply pipe.

[0026] In one embodiment, (c-2) the process of calculating the predicted value of the loading amount of the electrode slurry is calculated by substituting the value of the flow rate of the electrode slurry and the value of the density of the electrode slurry into the following Equation 1 and / or Equation 2 to calculate the predicted value of the loading amount of the electrode slurry.

[0027] [Equation 1]

[0028] Loading amount prediction value = [electrode slurry flow rate × {1-(density of solvent in electrode slurry / density of electrode slurry)}] / A

[0029] [Equation 2]

[0030] Loading amount prediction value = [electrode slurry flow rate × {electrode slurry solid content concentration / (electrode slurry coating width length × electrode slurry coating speed)}] + B

[0031] In one embodiment, when the determination process (d) determines that the condition is not satisfied, the processes (b) to (d) are repeated until the determination process (d) determines that the condition is satisfied.

[0032] In one embodiment, during (b) setting the RPM of the pump,

[0033] When the correction constant A of Equation 1 is determined, the RPM of the pump is set so that the predicted value of the loading amount of the electrode slurry in Equation 1 meets the target value of the loading amount of the electrode slurry,

[0034] When the correction constant A of Equation 1 is not determined, the process includes setting the RPM of the pump so that the predicted value of the loading amount of the electrode slurry calculated according to Equation 2 meets the target value of the loading amount of the electrode slurry.

[0035] The electrode slurry coating method according to one embodiment further includes (f) a loading amount measuring process of measuring a loading amount of the electrode slurry coated on the electrode base substrate.

[0036] According to one embodiment, the electrode slurry coating method further includes a process of calculating the correction constant A of Equation 1 when the correction constant A of Equation 1 is not determined, so that the predicted value of the loading amount of the electrode slurry calculated by substituting it into Equation 1 is equal to the measured value of the loading amount of the electrode slurry.

[0037] According to one embodiment, the electrode slurry coating method further includes a process of recalculating the correction constant A of Equation 1 when the correction constant A of Equation 1 is determined and when the difference between the predicted value of the loading amount of the electrode slurry calculated according to Equation 1 and the measured value of the loading amount of the electrode slurry measured in the (f) loading amount measurement process exceeds a reference range.

[0038] In one embodiment, (e) the coating process comprises:

[0039] (e-1) a process of measuring the flow rate of the electrode slurry and the density of the electrode slurry;

[0040] (e-2) a process of calculating a predicted value of the loading amount of the electrode slurry based on the measurement information;

[0041] (e-3) determining whether the predicted value of the electrode slurry loading amount satisfies the electrode slurry loading amount management range; and

[0042] (e-4) A process of readjusting the RPM of the pump if it is determined that the conditions are not satisfied in the determination process.

[0043] In one embodiment, the coating process conditions include any one or two or more of a target value of the loading amount of the electrode slurry, a coating speed of the electrode slurry, a coating width and length, and a solid content concentration of the electrode slurry.

[0044] Beneficial effects

[0045] According to the electrode slurry coating system and coating method of the present disclosure, when managing the loading amount of the electrode slurry, it is not based on the measured value of the loading amount after the electrode is dried, but based on the measurement information in the state of the electrode slurry. Therefore, compared with the conventional technology that only determines the loading defect after drying, it is possible to minimize the waste of electrode material.

[0046] According to the electrode slurry coating system and coating method of the present disclosure, when managing the loading amount of the electrode slurry, it is not based on the measured value of the loading amount of the electrode slurry, but on the predicted value of the loading amount of the electrode slurry calculated based on the flow rate of the electrode slurry and the density of the electrode slurry which are easy to measure, thereby improving the convenience of managing the loading amount.

[0047] According to the electrode slurry coating system and coating method of the present disclosure, when calculating the predicted value of the loading amount of the electrode slurry, it is not based on the solid content concentration of the electrode slurry, but on the flow rate of the electrode slurry and the density of the electrode slurry, thereby improving reliability.

[0048] The electrode slurry coating system and coating method according to the present disclosure include a control unit for controlling the RPM of the pump so that the electrode slurry loading amount prediction value calculated based on the measurement information measured in real time satisfies the electrode slurry loading amount management range, thereby reducing the occurrence rate of loading defects. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 is a block diagram of a coating system for an electrode slurry according to an exemplary embodiment of the present disclosure.

[0050] Figure 2 FIG. 1 is a schematic diagram of a coating system for an electrode slurry according to a first embodiment.

[0051] Figure 3 FIG. 1 is a schematic diagram of a coating system for an electrode slurry according to a second embodiment.

[0052] Figure 4 is a flowchart illustrating a method of coating an electrode slurry according to an exemplary embodiment of the present disclosure.

[0053] Figure 5 is a flow chart illustrating a test coating process according to an exemplary embodiment of the present disclosure.

[0054] Figure 6 is a flowchart illustrating a method of coating an electrode slurry according to an exemplary embodiment of the present disclosure.

[0055] Figure 7 is a diagram illustrating an HMI of an electrode slurry coating system according to a first embodiment.

[0056] Figure 8 is a diagram illustrating an HMI of an electrode slurry coating system according to a second embodiment.

[0057] [Reference Markings]

[0058] 100, 200: Electrode slurry coating system

[0059] 110: Supply tank, first supply tank

[0060] 210: Second supply tank

[0061] 120: Coating mold

[0062] 130: Supply pipeline, first supply pipeline

[0063] 230: Second supply pipeline

[0064] 140: Pump, first pump

[0065] 240: Second pump

[0066] 150: Mass flow meter, first mass flow meter

[0067] 250: Second mass flow meter

[0068] 160: Control unit

[0069] 170: HMI

[0070] 180: Valve, first valve

[0071] 280: Valve, second valve

[0072] 182: Reflux valve

[0073] 190: Return pipe, first return pipe DETAILED DESCRIPTION

[0074] Hereinafter, the present disclosure will be described in detail with reference to the accompanying drawings. Before this, the terms and words used in this specification and claims should not be interpreted as limited to general or dictionary terms, but should be interpreted according to the meaning and concept of the technical idea of ​​the present disclosure based on the concept that the inventor has appropriately defined the terms in order to best explain the principle of the present invention.

[0075] Therefore, it should be understood that the embodiments described herein and the configurations shown in the accompanying drawings are merely the most preferred embodiments of the present disclosure and are not intended to represent the entire technical concept of the present disclosure. Various equivalents and modifications that may replace them may exist on the filing date.

[0076] Furthermore, in describing the present disclosure, a detailed description of the configuration or function of the relevant disclosure will be omitted if it is considered that such detailed description would obscure the subject matter of the present disclosure.

[0077] The present disclosure is illustrated by way of embodiments to more fully explain the present disclosure to those skilled in the art. Therefore, for the sake of clarity, the shapes and sizes of components in the drawings may be exaggerated, omitted, or schematically illustrated. Therefore, the size or ratio of each component does not necessarily represent its actual size or ratio.

[0078] In the present disclosure, the term “loading amount of the electrode slurry” includes a general concept of the weight of the electrode slurry coated on a current collector as a base substrate of an electrode and the weight of the electrode slurry per unit area.

[0079] Electrode slurry coating system

[0080] The present disclosure provides an electrode slurry coating system as a first embodiment.

[0081] (First embodiment)

[0082] Figure 1 is a block diagram of a coating system for an electrode slurry according to an exemplary embodiment of the present disclosure, Figure 2 FIG. 1 is a schematic diagram of a coating system for an electrode slurry according to a first embodiment.

[0083] 1 , an electrode slurry coating system 100 according to an exemplary embodiment of the present disclosure may include a supply tank 110 , a coating die 120 , a supply pipe 130 , a pump 140 , a mass flow meter 150 , a control unit 160 , an HMI 170 , and valves 181 , 182 .

[0084] According to an exemplary embodiment of the present disclosure, a mass flow meter 150 is installed along the path of the supply pipe 130. The mass flow meter 150 measures the flow rate and density of the electrode slurry transported in the supply pipe 130. The control unit 160 calculates a predicted value for the electrode slurry loading amount based on the measurement information and controls the calculated predicted value to meet a preset loading amount management range. Therefore, since the electrode slurry loading amount is managed in real time during the electrode slurry coating process using the predicted value, the occurrence of material loss and electrodes exceeding the loading amount management range can be reduced compared to conventional techniques that only confirm changes in the electrode slurry loading amount after the electrode drying process.

[0085] Hereinafter, the electrode slurry coating system of the present disclosure will be described in detail.

[0086] The supply tank 110 may include an internal space for accommodating the electrode slurry therein, for storing the electrode slurry including the electrode active material. The supply tank 110 may be configured to supply the electrode slurry to the coating die 120 by appropriate means. In some embodiments, an agitator may be provided within the supply tank 110 to uniformly mix the electrode slurry, and the electrode slurry coating system 100 may further include a drive device capable of driving the agitator.

[0087] The electrode slurry may be a positive electrode slurry including a positive electrode active material, or it may be a negative electrode slurry including a negative electrode active material.

[0088] The coating die 120 may be configured to coat the electrode slurry delivered from the supply tank 110 onto the electrode base substrate. The coating die 120 may be configured to coat the electrode slurry onto the electrode base substrate with an appropriate width and thickness. The coating die 120 may have a slit for discharging the electrode slurry with a predetermined width and thickness, and may have an internal structure that enables the electrode slurry to be discharged at an overall constant pressure.

[0089] The supply pipe 130 connects the supply tank 110 and the coating die 120 , and serves as a path for transferring the electrode slurry from the supply tank 110 to the coating die 120 .

[0090] The pump 140 may be provided on the supply pipe 130. Here, when it is stated that a specific element is provided "on" the pipe, it means that the specific element is inserted in the middle of the extended pipe or the specific element is connected to the end of the pipe, and the same applies hereinafter unless otherwise specified.

[0091] The pump 140 can be configured to provide a driving force for conveying the electrode slurry to the coating die 120. By applying a predetermined range of pressure to the electrode slurry stored in the supply tank 110, the pump 140 provides a driving force to convey the electrode slurry to the coating die 120 through the supply pipe 130. In some embodiments, the pump 140 can be a forced delivery pump for conveying the electrode slurry. In some embodiments, the pump 140 can be a type of pump that conveys the electrode slurry by providing centrifugal force to the electrode slurry. However, the present disclosure is not limited thereto.

[0092] One or more filters F may be provided on the path of the supply pipe 130. In some embodiments, a first filter of a magnetic type may be provided on the supply pipe 130. The first filter may be provided to remove specific magnetic impurities in the electrode slurry.

[0093] In some embodiments, a second filter may be provided on the supply pipe 130. The second filter may include a filter membrane for filtering foreign matter in the electrode slurry.

[0094] A return pipe 190 may be provided on the path of the supply pipe 130. The return pipe 190 is configured to branch from the supply pipe 130 and return to the supply tank 110 to return a portion of the electrode slurry to the supply tank 110 during a line stop. In some embodiments, the return pipe 190 may branch from the supply pipe 130 via a T-shaped pipe.

[0095] The supply pipe 130 may include one or more valves 181, 182 for controlling the flow path of the electrode slurry. Specifically, the valves may include a supply valve 181 for controlling the delivery of the electrode slurry to the coating die 120 and a return valve 182 for controlling the return of the electrode slurry to the supply tank 110.

[0096] In some embodiments, the supply valve 181 and the return valve 182 can each be an on-off valve configured to be opened and closed by an electrical signal, hydraulic pressure, or pneumatic pressure. In some embodiments, the supply valve 181 and the return valve 182 can each be a control valve whose opening degree can be precisely controlled by an electrical signal, hydraulic pressure, or pneumatic pressure.

[0097] The supply valve 181 may be provided between the branch point where the return pipe 190 branches from the supply pipe 130 and the coating die 120. The reflux valve 182 may be provided between the branch point where the return pipe 190 branches from the supply pipe 130 and the supply tank 110.

[0098] The flow path and / or flow rate of the electrode slurry can be controlled by adjusting the opening and closing of each of the supply valve 181 and the return valve 182. In some embodiments, when the return valve 182 is closed and the supply valve 181 is open, the electrode slurry can be supplied entirely to the coating die 120 without returning to the supply tank 110. In other embodiments, when the supply valve 181 is closed and the return valve 182 is open, the electrode slurry can be returned entirely to the supply tank 110 without being supplied to the coating die 120.

[0099] One or more pressure gauges may be provided on the supply pipe 130. The pressure gauge may be provided at any location where pressure measurement is required on the supply pipe 130. The pressure gauge may be configured to generate an electrical signal in response to the delivery pressure of the electrode slurry, or may be configured to generate a pneumatic signal.

[0100] In some embodiments, a pressure gauge may be provided between the pump 140 and the coating die 120. In some embodiments, a pressure gauge may be provided between the pump 140 and the mass flow meter 150. In some embodiments, pressure gauges may be provided between the first filter and the second filter and between the second filter and the mass flow meter 150, respectively.

[0101] The mass flow meter 150 can be installed on the path of the supply pipe 130 and can be configured to measure the flow rate of the electrode slurry transported through the supply pipe and the density of the electrode slurry. In some embodiments, the mass flow meter 150 can be configured to measure the flow rate of the electrode slurry flowing per unit time, thereby calculating the density of the electrode slurry. In some embodiments, considering that each measured value of the flow rate of the electrode slurry and the density of the electrode slurry is affected by temperature, the mass flow meter 150 may include a temperature sensor to correct for the influence of temperature. In some embodiments, the mass flow meter 150 can be a Coriolis mass flow meter configured to directly measure the flow rate, density and temperature of the electrode slurry.

[0102] The control unit 160 calculates a loading amount prediction value of the electrode slurry based on measurement information measured by the mass flow meter 150 and controls the calculated loading amount prediction value of the electrode slurry to satisfy a loading amount management range.

[0103] In some embodiments, the control unit 160 may include a calculation unit to calculate a predicted value of the loading amount of the electrode slurry, and the calculation unit may substitute the flow rate value of the electrode slurry measured by the mass flow meter and the density value of the electrode slurry into the following Equation 1 and / or Equation 2 to calculate the predicted value of the loading amount of the electrode slurry.

[0104] [Equation 1]

[0105] Loading amount prediction value = [electrode slurry flow rate × {1-(density of solvent in electrode slurry / density of electrode slurry)}] / A

[0106] [Equation 2]

[0107] Loading amount prediction value = [electrode slurry flow rate × {electrode slurry solid content concentration / (electrode slurry coating width length × electrode slurry coating speed)}] + B

[0108] Here, the correction constant A and the correction constant B are correction constants used to reflect errors in the measured values ​​and errors caused by the coating equipment, etc., respectively. The load amount prediction value calculated according to Equation 1 or Equation 2 is based on any one or more of the respective measured values ​​of flow rate, density, and solid content concentration, and these measured values ​​may vary depending on the measurement environment and measurement conditions. In addition, even when the measured values ​​are the same, the predicted value may also vary depending on the coating equipment. The correction constants A and B can reflect such measurement errors and coating equipment errors, thereby improving the accuracy of the load amount prediction value.

[0109] In addition, such correction constants A and B can be calculated based on the load measurement value and the load prediction value, and after determining the correction constants A and B, the load can be predicted according to Equation 1 and / or Equation 2 without measuring the load.

[0110] Since the electrode slurry coating system 100 according to the present disclosure can manage the loading amount of the electrode slurry based on the predicted value of the loading amount of the electrode slurry calculated according to the above equation 1 and / or equation 2, it has the advantage of being convenient because it does not need to measure the loading amount of the electrode slurry in the electrode slurry state. In addition, it is possible to correct errors caused by the coating equipment by using the correction constant A and / or the correction constant B, thereby improving reliability.

[0111] When the correction constant A is known, or when the correction constant A is determined, the predicted value of the electrode slurry loading amount can be calculated according to Equation 1. In Equation 1, the flow rate of the electrode slurry and the density of the electrode slurry are each substituted by the values ​​measured by the mass flow meter 150. In addition, in Equation 1, the density of the solvent in the electrode slurry is substituted by the density value of the solvent such as NMP or water. In Equation 1, A is a correction constant that corrects errors caused by the coating equipment.

[0112] When the calibration constant A is unknown or undetermined, the predicted value of the electrode slurry loading can be calculated according to Equation 2. In Equation 2, the solid content concentration of the electrode slurry, the coating width and length of the electrode slurry, and the coating speed of the electrode slurry are substituted with preset values ​​based on the electrode model. In addition, in Equation 2, the flow rate of the electrode slurry is substituted with the value measured by the mass flow meter. In addition, in Equation 2, B is a calibration constant that corrects for errors caused by the coating equipment.

[0113] In Equation 2, since the solid content concentration of the electrode slurry changes with time, the measured value of the solid content concentration may have errors. In other words, the predicted value of the electrode slurry loading amount according to Equation 2 may have errors caused by actual measurement errors of the solid content concentration of the electrode slurry. Therefore, Equation 1 can improve the reliability of predicting the electrode slurry loading amount compared to Equation 2.

[0114] Therefore, the electrode slurry coating system 100 according to the present disclosure basically performs calculations according to Equation 1 when calculating the predicted value of the loading amount of the electrode slurry. However, when the correction constant A of Equation 1 is unknown or not determined, the predicted value of the loading amount of the electrode slurry can be auxiliary calculated according to Equation 2.

[0115] When the predicted value of the loading amount of the electrode slurry cannot be calculated according to Equation 1, the electrode slurry coating system 100 may further include a loading amount measuring instrument (not shown) to derive the correction constant A. In addition, even when the predicted value of the loading amount of the electrode slurry can be calculated according to Equation 1, the loading amount measuring instrument may be required to recalculate the correction constant A due to reasons such as measurement tolerance of the mass flow meter caused by time variation of the coating process.

[0116] In some embodiments, the control unit 160 controls to perform a test coating process before fully starting the coating process of the electrode, and during the test coating process, the correction constant A may be derived.

[0117] The type of the loading amount measuring instrument is not limited, as long as it is a device capable of measuring the loading amount of the electrode slurry coated on the electrode base substrate. In some embodiments, the loading amount measuring instrument can be a mesh gauge.

[0118] In theory, the predicted value of the electrode slurry loading should match the measured value of the electrode slurry loading, so that the correction constant A of Equation 1 or the correction constant B of Equation 2 can be calculated based on the measured value of the electrode slurry loading measured by the loading measuring instrument and the predicted value of the electrode slurry loading calculated by substituting it into Equation 1 or Equation 2.

[0119] The control unit 160 can control to adjust the (RPM) of the pump until the predicted value of the electrode slurry loading calculated according to Equation 1 and / or Equation 2 satisfies the loading management range. Specifically, the control unit 160 can control to increase the RPM of the pump to increase the loading amount when the predicted loading amount value is less than the loading management range. Conversely, the control unit 160 can control to decrease the RPM of the pump to reduce the loading amount when the predicted loading amount value is greater than the loading management range.

[0120] In some embodiments, as described above, the control unit 160 can control to start the electrode coating process if the calculated predicted value of the loading amount of the electrode slurry satisfies the loading amount management range.

[0121] In some embodiments, even after the electrode coating process is started, the control unit 160 can be configured to calculate a predicted value of the electrode slurry loading amount based on the real-time measured flow rate of the electrode slurry and the density of the electrode slurry, and determine whether the calculated predicted value of the electrode slurry loading amount meets the electrode slurry loading amount management range, and can control the RPM of the pump when the management range is not met.

[0122] In some embodiments, the control unit 160 may control to generate a warning sound when the calculated predicted value of the loading amount of the electrode slurry does not satisfy the loading amount management range.

[0123] As a non-limiting example, the control unit 160 may be a programmable logic controller (PLC). A PLC is a specialized form of microprocessor-based controller that uses programmable memory to store instructions and perform functions such as logic, sequencing, timing, counting, and arithmetic to control machines and processes. PLCs are easy to operate and program.

[0124] In some embodiments, the control unit 160 may include a CPU, an input interface, an output interface, a communication interface, and a storage device.

[0125] The storage device may include a read-only memory (ROM) configured to store system programs such as an operating system, and a random access memory (RAM) configured to store user programs and data such as status information of input and output devices, values ​​of timers, counters, and other internal devices.

[0126] The CPU can be configured to control communication between modules implementing the logic and convert input signals into output operation signals. The CPU can operate based on system programs and user programs stored in the storage device. The CPU can be configured to write (Write) or read (Read) measurement data in the data area of ​​the storage device based on the system programs and user programs.

[0127] The coating process conditions or data for each electrode model can be transmitted to the CPU via the input interface. The results processed by the CPU can be output via the output interface.

[0128] In some embodiments, the electrode slurry coating system 100 may further include a human-machine interface (HMI) for communicating with the control unit 160. Through the HMI, the operator can input the electrode model to be coated, and through the HMI, the control unit can output: preset electrode coating process conditions (loading amount target value, coating speed, coating width and length, solid content concentration) for the input electrode model, real-time measured flow rate and density values ​​of the electrode slurry, predicted value of the electrode slurry loading amount, temperature measurement value of the electrode slurry, and determination information indicating whether the predicted value of the electrode slurry loading amount meets the loading amount management range.

[0129] Figure 7is a diagram illustrating an HMI of an electrode slurry coating system according to a first embodiment.

[0130] Reference Figure 7 , by touching the "SET" option of ①, it is possible to move to the HMI where the coating process condition data is output. By touching the "LOAD" option of ②, the coating process condition data can be loaded and input. Then, as shown in ③, the selected coating process conditions (model name, target loading amount, coating speed, coating width length and solid content concentration of the electrode slurry) can be output through the HMI. Then, as shown in ④, the flow rate measurement value of the electrode slurry measured by the mass flow meter 150, the density measurement value and the temperature measurement value of the electrode slurry can be output via the HMI, and as shown in ⑤, the loading amount prediction value of the electrode slurry calculated based on the measurement information of the mass flow meter can be output through the HMI.

[0131] In addition, by comparing the predicted value of the electrode slurry loading and the electrode slurry loading management range, an alarm can be set as in ⑥ to issue a warning when the predicted value of the electrode slurry loading exceeds the loading management range. In an exemplary embodiment, the loading management range can be divided into a first management range that is a desired management range and a second management range that is a standard for good products and defective products. Then, if the predicted value of the loading is within the first management range, the predicted value of the loading can be output in green; if the predicted value of the loading is outside the first management range but not outside the second management range, the predicted value of the loading can be output in yellow; if the predicted value of the loading is outside the second management range, the predicted value of the loading can be output in red.

[0132] In the case where the electrode slurry coating system 100 includes a loading amount measuring instrument (not shown), a measurement value of the loading amount measuring instrument may be input by touching the option of ⑦.

[0133] In addition, if the correction constant A of Equation 1 is determined and the electrode slurry loading amount prediction value is calculated according to Equation 1, the "Offset" of ⑧ can be output as "Active", which means that the correction constant A is determined. However, if the correction constant A of Equation 1 is not determined and the electrode slurry loading amount prediction value cannot be calculated according to Equation 1, and the electrode slurry loading amount prediction value is calculated according to Equation 2, the "Offset" of ⑧ can be output as "Inactive".

[0134] (Second embodiment)

[0135] Figure 3 Schematic diagram of an electrode slurry coating system according to a second embodiment. Figure 3, the electrode slurry coating system 200 according to the second embodiment may be an electrode slurry coating system for manufacturing a multi-layer electrode, in which the coating die 120 has two or more slits for discharging the electrode slurry.

[0136] Therefore, the coating die 120 may be configured to have two or more slits, and as a non-limiting example, the coating die 120 may be configured to discharge the first electrode paste from one slit and the second electrode paste from another slit. In this case, the first electrode paste and the second electrode paste may have the same composition, or the composition may be different.

[0137] The electrode slurry coating system 200 for coating a first electrode slurry and a second electrode slurry comprises: a first supply tank 110 and a second supply tank 210, wherein the first supply tank 110 is used to store the first slurry and the second supply tank 210 is used to store the second electrode slurry; a coating die 120, which is used to coat the first electrode slurry and the second electrode slurry on an electrode base substrate; a first supply pipe 130 and a second supply pipe 230, wherein the first supply pipe 130 is used as a conveying path for the first electrode slurry from the first supply tank 110 to the coating die 120, and the second supply pipe 230 is used as a conveying path for the second electrode slurry from the second supply tank 210 to the coating die 120; a first pump 140 and a second pump 240, wherein the first pump 140 is configured to provide a driving force for conveying the first electrode slurry to the coating die 120. Power, the second pump 240 is configured to provide a driving force for conveying the second electrode slurry to the coating die 120; a first mass flow meter 150, installed on the path of the first supply pipe 130, for measuring the flow rate of the first electrode slurry conveyed through the first supply pipe 130 and the density of the first electrode slurry; a second mass flow meter 250, installed on the path of the second supply pipe 230, for measuring the flow rate of the second electrode slurry conveyed through the second supply pipe 230 and the density of the second electrode slurry; and a control unit 160, for calculating the loading amount prediction value of the first electrode slurry and the second electrode slurry based on the respective measurement information measured by the first mass flow meter 150 and the second mass flow meter 250, and controlling the calculated loading amount prediction value of the electrode slurry to meet the higher loading amount management range.

[0138] Furthermore, the first supply conduit 130 and the second supply conduit 230 may include one or more valves 180 , 280 to control the flow paths of the first electrode slurry and the second electrode slurry.

[0139] Furthermore, on the paths of the first supply pipe 130 and the second supply pipe 230 , a first return pipe 190 and a second return pipe 290 may be provided, respectively.

[0140] Compared to the electrode slurry coating system 100 according to the first embodiment, the electrode slurry coating system 200 according to the second embodiment differs only in that a second supply tank 210, a second supply pipe 230, a second pump 240, and a second valve 280 for supplying and conveying the second electrode slurry are further added; a second mass flow meter 250 for measuring the flow rate and density of the second electrode slurry; and a second return pipe 290 for returning the second electrode slurry are further added. These configurations have been described in detail above, so redundant descriptions will be omitted.

[0141] Figure 8 is a diagram illustrating an HMI of an electrode slurry coating system according to a second embodiment.

[0142] Reference Figure 8 The HMI of the electrode slurry coating system according to the second embodiment is different from that of the electrode slurry coating system according to the first embodiment only in that it is configured to output information of the upper layer and the lower layer of the electrode slurry separately.

[0143] Specifically, as shown in ③, the coating process conditions (model name, target loading amount, coating speed, coating width and length, and solid content concentration of the electrode slurry) can be output for each of the upper and lower layers through the HMI, as shown in ④, the respective measurement information of the upper and lower layers measured by the mass flow meters 150 and 250 (electrode slurry flow rate, electrode slurry density, and electrode slurry temperature) can be output for each of the upper and lower layers through the HMI, and as shown in ⑤, the electrode slurry loading amount prediction value calculated based on the measurement information of the mass flow meter can be output for each of the upper and lower layers through the HMI. In addition, by comparing the electrode slurry loading amount prediction value with the electrode slurry loading amount management range, the electrode slurry loading amount prediction value can be output for each of the upper and lower layers as in ⑥, so as to issue a warning when the electrode slurry loading amount prediction value exceeds the loading amount management range.

[0144] Electrode slurry coating method

[0145] The present disclosure provides an electrode slurry coating method as a second embodiment.

[0146] Figure 4 is a flow chart illustrating an electrode slurry coating method according to an exemplary embodiment of the present disclosure, Figure 5 is a flow chart illustrating a test coating process according to an exemplary embodiment of the present disclosure.

[0147] Reference Figure 4According to one embodiment of the present disclosure, the electrode slurry coating method may include: (a) setting coating process conditions according to the electrode model (P110); (b) setting the RPM of the pump (P120); (c) testing the coating process (P130); (d) determining whether the predicted value of the electrode slurry loading amount satisfies the electrode slurry loading amount management range (P140); and (e) coating process (P150). In addition, referring to Figure 5 , (c) the process of testing the coated electrode slurry may include: (c-1) measuring the flow rate of the electrode slurry and the density of the electrode slurry P131; and (c-2) calculating a predicted value P132 of the loading amount of the electrode slurry based on the measurement information.

[0148] According to an embodiment of the present invention, the electrode slurry coating method calculates a predicted electrode slurry loading amount based on the electrode slurry flow rate and electrode slurry density values ​​measured in the test coating process P130, and the coating process P150 is initiated only when the calculated predicted electrode slurry loading amount meets the loading amount management range. Therefore, compared with the conventional techniques described above, material loss can be minimized. Furthermore, during the coating process P150, the electrode slurry loading amount can be managed in real time by measuring the electrode slurry flow rate and electrode slurry density with high measurement accuracy, thereby improving the reliability and convenience of loading management.

[0149] According to some embodiments, an electrode slurry coating method may be to coat the electrode slurry using the electrode slurry coating system 100 described above.

[0150] In some embodiments, the step (a) of setting coating process conditions according to the electrode model (P110) may include inputting the electrode model to be coated and retrieving preset coating process conditions according to the electrode model. In some embodiments, the coating process conditions may be any one, two, or more of a target loading amount, a coating speed (m / s) of the electrode slurry, a coating width and length, and a solid content concentration of the electrode slurry.

[0151] In some embodiments, the process (b) of setting the pump RPM (P120) may be a process of presetting the pump RPM before starting the test coating and / or coating process, while the electrode slurry is circulating. Here, the electrode slurry circulation state may be a state where the electrode slurry is being transported from the supply tank to the coating die via the supply pipe before the electrode slurry is discharged from the coating die. Alternatively, the electrode slurry may be transported from the supply tank to the coating die via the supply pipe and then returned to the supply tank via the return pipe.

[0152] In some embodiments, step (b) of setting the pump RPM (P120) may be a step of setting the pump RPM so that the predicted value of the electrode slurry loading amount reaches the target loading amount value set in step (a). Here, the target loading amount value may be a set loading amount for the corresponding electrode model and differs from the loading amount management range. The former is a specific value, while the latter may be a range of loading amount values ​​that serves as a standard for good and defective products.

[0153] In some embodiments, when an electrode model is input via the HMI, the control unit 160 may output coating process conditions including a target loading value for the electrode model input via the HMI. Furthermore, the control unit 160 may calculate a predicted loading value according to Equation 1 and / or Equation 2 below, automatically calculate the RPM of the pump so that the calculated predicted loading value is the target loading value, and output the automatically calculated RPM of the pump via the HMI.

[0154] [Equation 1]

[0155] Loading amount prediction value = [electrode slurry flow rate × {1-(density of solvent in electrode slurry / density of electrode slurry)}] / A

[0156] [Equation 2]

[0157] Loading amount prediction value = [electrode slurry flow rate × {electrode slurry solid content concentration / (electrode slurry coating width length × electrode slurry coating speed)}] + B

[0158] When the correction constant A is determined, the load amount prediction value may be calculated according to Equation 1. When the correction constant A is not determined, the load amount prediction value may be calculated according to Equation 2.

[0159] (c) The process P130 of testing the coating of the electrode slurry is a process in which the electrode slurry is coated in an actual electrode slurry coating environment rather than in a slurry circulation state before coating. While coating the electrode slurry according to the coating process conditions set above, the RPM of the motor is readjusted to meet the target value of the electrode slurry loading amount, and the coating width and length of the electrode slurry are fine-tuned.

[0160] In order to readjust the RPM of the motor so that the predicted value of the electrode slurry loading meets the target value of the electrode slurry loading, the process (c) of testing the electrode slurry coating (P130) may include: (c-1) measuring the flow rate and density of the electrode slurry (P131); and (c-2) calculating the predicted value of the electrode slurry loading based on the measured information (P132). Since the predicted value of the electrode slurry loading may change slightly as the step changes from the pre-coating slurry circulation state to the coating process state, in the process (c) of testing the electrode slurry coating (P130), the flow rate and density of the electrode slurry are measured in real time, and the predicted value of the electrode slurry loading is calculated based on the measured value of the flow rate and density of the electrode slurry.

[0161] (c-1) The process of measuring the flow rate and density of the electrode slurry may be performed by measuring the flow rate and density of the electrode slurry through the mass flow meter 150 installed on the path of the supply pipe 130. Since the mass flow meter 150 has been described in detail above, redundant description will be omitted.

[0162] (c-2) The process of calculating the predicted value of the loading amount of the electrode slurry may be to substitute the flow rate value of the electrode slurry and the density value of the electrode slurry into Equation 1 and / or Equation 2 to calculate the predicted value of the loading amount of the electrode slurry.

[0163] When the correction constant A is determined, the load amount prediction value may be calculated according to Equation 1. When the correction constant A is not determined, the load amount prediction value may be calculated according to Equation 2.

[0164] In some embodiments, when calculating the loading amount of the electrode slurry according to Equation 1, the flow rate value of the electrode slurry and the density value of the electrode slurry substituted into Equation 1 can be the average value of the flow rate of the electrode slurry and the average value of the density of the electrode slurry measured 6 to 10 seconds before the end of the (c) test coating process.

[0165] The (c) process of testing the coated electrode slurry is ended by operating the valve 181 to close the supply pipe 130, and then the (d) determination process is performed.

[0166] The (d) determination process is a process of determining whether the predicted value of the loading amount of the electrode slurry satisfies the loading amount management range of the electrode slurry.

[0167] If the conditions are satisfied in the (d) determination process P140, the (e) coating process P150 may be started. However, if the conditions are not satisfied in the (d) determination process P140, the (b) pump RPM setting process P120 to the (d) determination process P140 are repeated until the conditions are satisfied in the determination process P140. Then, the (e) coating process P150 is started only if the conditions are satisfied in the (d) determination process P140.

[0168] (e) A coating process (P150) includes: (e-1) a process (P151) of measuring the flow rate and density of the electrode slurry; (e-2) a process (P152) of calculating a predicted value of the electrode slurry loading amount based on the measurement information; (e-3) a process (P153) of determining whether the predicted value of the electrode slurry loading amount satisfies the electrode slurry loading amount management range; and (e-4) a process (P154) of re-adjusting the RPM of the pump if it is determined that the predicted value does not meet the range in the determination process. Thus, the electrode slurry loading amount can be appropriately managed in real time during the coating process.

[0169] In the following, reference is made to Figure 4 , the electrode slurry coating method according to the present disclosure when the correction constant A is determined will be described in detail.

[0170] When the correction constant A is determined, the load amount prediction value of the electrode slurry is calculated according to Equation 1. Specifically, in the process P120 of (b) setting the RPM of the pump, the RPM of the pump can be preset so that the load amount prediction value of the electrode slurry calculated according to Equation 1 meets the load amount target value. In the (c) test coating process P130, the load amount prediction value of the electrode slurry can be calculated according to Equation 1. Then, if it is determined that it is not satisfied in the (d) determination process, it can return to the process P120 of (b) setting the RPM of the pump, and the RPM of the pump can be readjusted so that the load amount prediction value of the electrode slurry calculated according to Equation 1 can meet the load amount target value.

[0171] In some embodiments, the electrode slurry coating method may further include a (f) loading measurement process, in which the loading of the electrode slurry coated on the electrode base substrate is measured. Ideally, the predicted loading value of the electrode slurry is the same as the measured loading value of the electrode slurry. As described later, when the correction constant A of Equation 1 is initially determined, the correction constant A is determined so that the predicted loading value according to Equation 1 and the measured loading value are the same; however, due to reasons such as the measurement tolerance of the mass flow meter caused by the time variation of the coating process, the difference between the predicted loading value according to Equation 1 and the measured loading value may gradually become larger. Therefore, when the difference between the predicted loading value of the electrode slurry calculated according to Equation 1 and the measured loading value of the electrode slurry measured in the (f) loading measurement process exceeds the reference range, it is preferred to include a process for recalculating the correction constant A of Equation 1.

[0172] In some embodiments, the (f) loading amount measurement process may be performed after the (c) test coating process P130. In addition, in some embodiments, the (f) loading amount measurement process may also be performed in the middle of the (e) coating process.

[0173] In the following, reference is made to Figure 6 , the electrode slurry coating method according to the present disclosure when the correction constant A is not determined will be described in detail.

[0174] If the correction constant A is not determined, the predicted value of the electrode slurry load according to Equation 1 cannot be directly calculated, so the process (b) of setting the pump RPM may include setting the pump RPM so that the predicted value of the electrode slurry load calculated according to Equation 2 meets the target value of the electrode slurry load. In addition, the process may include measuring the electrode slurry load to calculate the correction constant A of Equation 1 (step (160)), and calculating the correction constant A of Equation 1 so that the predicted value of the electrode slurry load calculated by substituting it into Equation 1 is equal to the measured value of the electrode slurry load (step (170)).

[0175] When the correction constant A is derived accordingly, the predicted value of the electrode slurry loading amount can be calculated according to Equation 1.

[0176] Since the remaining processes P110 to P160 except the process P170 of calculating the correction constant A of Equation 1 have been described in detail above, redundant descriptions will be omitted.

[0177] The electrode slurry coating system 100 , 200 and the electrode slurry coating method according to the present disclosure have the effect of being able to manage the loading amount of the electrode slurry by measuring the flow rate of the electrode slurry and the density of the electrode slurry with high measurement accuracy, thereby improving the reliability and convenience of the loading amount management.

[0178] As described above, the present disclosure has been described in more detail through the accompanying drawings and embodiments. However, since the configuration described in the drawings or the embodiment described in this article is only one embodiment of the present disclosure and does not represent the overall technical spirit of the present disclosure, it should be understood that the present disclosure covers various equivalents, modifications and replacements at the time of filing this application.

Claims

1. An electrode slurry coating system for coating an electrode slurry on an electrode base substrate, The electrode slurry coating system comprises: a supply pipe connecting a supply tank for storing the electrode slurry and a coating die for coating the electrode slurry on the electrode base substrate, wherein the supply pipe is a conveying path for conveying the electrode slurry from the supply tank to the coating die; a mass flow meter installed on the path of the supply pipe and configured to measure a flow rate of the electrode slurry transported through the supply pipe and a density of the electrode slurry; as well as A control unit is configured to calculate a predicted value of the electrode slurry loading amount based on measurement information measured by the mass flow meter, and to control the calculated predicted value of the electrode slurry loading amount to satisfy a loading amount management range. 2 . The electrode slurry coating system according to claim 1 , further comprising a pump configured to provide a driving force for delivering the electrode slurry to the coating die.

3. The electrode slurry coating system according to claim 1, wherein the control unit includes a calculation unit that calculates the loading amount prediction value of the electrode slurry by substituting the value of the flow rate of the electrode slurry measured by the mass flow meter and the value of the density of the electrode slurry into the following Equation 1 and / or Equation 2. [Equation 1] Loading amount prediction value = [electrode slurry flow rate × {1-(density of solvent in electrode slurry / density of electrode slurry)}] / A [Equation 2] Loading amount prediction value = [electrode slurry flow rate × {electrode slurry solid content concentration / (electrode slurry coating width length × electrode slurry coating speed)}] + B 4. The electrode slurry coating system according to claim 3, further comprising a loading amount measuring instrument for measuring a loading amount of the electrode slurry coated on the electrode, Wherein, when the correction constant A is not determined, the calculation unit is configured to calculate the correction constant A of the equation 1 based on the loading amount measurement value of the electrode slurry measured by the loading amount measuring instrument and the loading amount prediction value of the electrode slurry calculated by substituting it into the equation 1. 5 . The electrode slurry coating system according to claim 2 , wherein the control unit controls to adjust the RPM (Revolutions per Minute) of the pump until the calculated predicted value of the loading amount of the electrode slurry satisfies the loading amount management range. 6 . The electrode slurry coating system according to claim 1 , wherein the control unit controls to start or continue an electrode coating process when the calculated predicted value of the loading amount of the electrode slurry satisfies the loading amount management range. 7 . The electrode slurry coating system according to claim 1 , wherein the control unit controls to generate a warning sound when the calculated predicted value of the loading amount of the electrode slurry does not satisfy the loading amount management range.

8. The electrode slurry coating system according to claim 1, further comprising a human-machine interface (HMI) for communicating with the control unit.

9. A method for coating an electrode slurry, comprising: (a) The process of setting coating process conditions according to electrode model; (b) The process of setting the RPM of the pump; (c) testing a process of coating the electrode slurry on an electrode base substrate according to the set coating process conditions; (d) determining whether the predicted value of the electrode slurry loading amount satisfies the electrode slurry loading amount management range; as well as (e) if it is determined that the conditions are satisfied in the determining process, starting a coating process to coat the electrode slurry, The process of (c) testing the coating of the electrode slurry comprises: (c-1) measuring the flow rate of the electrode slurry and the density of the electrode slurry; as well as (c-2) Calculating a predicted value of the loading amount of the electrode slurry based on the measurement information.

10. The electrode slurry coating method according to claim 9, wherein in the process of (c-1) measuring the flow rate of the electrode slurry and the density of the electrode slurry, the flow rate of the electrode slurry and the density of the electrode slurry are measured by a mass flow meter installed on a path of a supply pipe.

11. The electrode slurry coating method according to claim 9, wherein the process (c-2) of calculating the predicted value of the loading amount of the electrode slurry is calculated by substituting the flow rate value of the electrode slurry and the density value of the electrode slurry into the following equation 1 and / or equation 2 to calculate the predicted value of the loading amount of the electrode slurry. [Equation 1] Loading amount prediction value = [electrode slurry flow rate × {1-(density of solvent in electrode slurry / density of electrode slurry)}] / A [Equation 2] Loading amount prediction value = [electrode slurry flow rate × {electrode slurry solid content concentration / (electrode slurry coating width length × electrode slurry coating speed)}] + B 12 . The method for coating an electrode slurry according to claim 9 , wherein when the determination process (d) is determined to be unsatisfactory, the processes (b) to (d) are repeated until the determination process (d) is determined to be satisfied.

13. The method for coating an electrode slurry according to claim 11, wherein in the process of (b) setting the RPM of the pump, When the correction constant A of the equation 1 is determined, the RPM of the pump is set so that the predicted value of the electrode slurry loading amount in the equation 1 satisfies the target value of the electrode slurry loading amount. When the correction constant A of Equation 1 is not determined, the process includes setting the RPM of the pump so that the load amount prediction value of the electrode slurry calculated according to Equation 2 satisfies the load amount target value of the electrode slurry. 14 . The method of coating an electrode slurry according to claim 11 , further comprising (f) a loading amount measuring process of measuring a loading amount of the electrode slurry coated on the electrode base substrate.

15. The method for coating an electrode slurry according to claim 14, further comprising a process of calculating the correction constant A of Equation 1 when the correction constant A of Equation 1 is not determined, so that the predicted value of the loading amount of the electrode slurry calculated by substituting it into Equation 1 is equal to the measured value of the loading amount of the electrode slurry.

16. The electrode slurry coating method according to claim 14 further comprises a process of recalculating the correction constant A of the equation 1 when the correction constant A of the equation 1 is determined and when the difference between the predicted value of the loading amount of the electrode slurry calculated according to the equation 1 and the measured value of the loading amount of the electrode slurry measured in the (f) loading amount measurement process exceeds a reference range.

17. The method for coating an electrode slurry according to claim 9, wherein the (e) coating process comprises: (e-1) a process of measuring the flow rate of the electrode slurry and the density of the electrode slurry; (e-2) a process of calculating the predicted value of the loading amount of the electrode slurry based on the measurement information; (e-3) determining whether the predicted value of the loading amount of the electrode slurry satisfies the loading amount management range of the electrode slurry; as well as (e-4) A process of readjusting the RPM of the pump if it is determined that the RPM is not satisfied in the determination process.

18. The electrode slurry coating method according to claim 9, wherein the coating process conditions include any one or two or more of a target value of a loading amount of the electrode slurry, a coating speed of the electrode slurry, a coating width length, and a solid content concentration of the electrode slurry.

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