Air volume adjustment method and adjustment system for negative electrode coater of secondary battery

Abstract

The present invention relates to the technical field of lithium-ion battery production, and provides a method and a regulating system for regulating the air volume of a negative electrode coater of a secondary battery. The method for regulating the air volume of the negative electrode coater of the secondary battery includes: obtaining the first humidity of the exhaust air discharged from the exhaust air fan connected to the oven of the first layer of the negative electrode coater in the air volume regulating system of the negative electrode coater of the secondary battery to the external environment and the second humidity of the fresh air sucked from the external environment by the fresh air fan connected to the oven; calculating the humidity difference between the first humidity and the second humidity to obtain the volume fraction φ; obtaining the safety factor K, and calculating the solvent control content B, where B = φ×K; obtaining the total volume V of the H2O working condition, and calculating the total amount A of the exhaust air of the exhaust air fan, where A = V / B; adjusting the air volume of the fresh air sucked by the fresh air fan; so as to solve the problem in the prior art that the air volume of the negative electrode coater cannot be adjusted in real time according to the external environment, and improve the control accuracy of the dryness and humidity of the electrode sheet during the coating process.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium-ion battery production, and more particularly, to a method and a regulating system for regulating the air volume of a negative electrode coater of a secondary battery. Background Art

[0002] Currently, in the production of the front process of lithium-ion batteries, fresh air for the negative electrode coater is taken from the outdoor environment, driven by a fresh air fan, passes through a filter, and then exchanges heat with the exhaust gas discharged from the coater. After that, it enters the negative electrode coater. After taking out water vapor, it is driven by an exhaust fan and discharged as exhaust gas.

[0003] In the prior art, the fresh air exhaust volume of the negative electrode coater often lacks accurate calculation and control logic. The air volume design is basically estimated by referring to 70% of the air volume of the positive electrode coater, or calculated according to 1.5% of the humidity difference between fresh air and exhaust air. The calculation conditions are single and relatively idealized, and can only meet the basic requirements for drying the negative electrode coater.

[0004] However, in a changing external environment, such as rainy or sunny days, the temperature and humidity of the external environment will change. It is impossible to adjust the air volume in real time according to the external environment. Only according to the situation of the products being produced at present, such as the high water content of the products, the air frequency of the fresh air fan is adjusted manually, which causes a large amount of waste of energy and materials. Summary of the Invention

[0005] The main object of the present invention is to provide a method and a regulating system for regulating the air volume of a negative electrode coater of a secondary battery, so as to solve the problem in the prior art that it is impossible to adjust the air volume of the negative electrode coater in real time according to the external environment.

[0006] To achieve the above object, according to one aspect of the present invention, a method for regulating the air volume of a negative electrode coater of a secondary battery is provided, including: obtaining a first humidity of the exhaust air discharged from an exhaust fan connected to the first-layer oven of the negative electrode coater in the air volume regulating system of the negative electrode coater of the secondary battery to the external environment and a second humidity of the fresh air sucked from the external environment by an intake fan connected to the first-layer oven of the negative electrode coater in the air volume regulating system of the negative electrode coater of the secondary battery; calculating a humidity difference between the first humidity and the second humidity to obtain a volume fraction φ, where the volume fraction φ is equal to the humidity difference; obtaining a safety factor K, and calculating a solvent control content B according to the volume fraction φ and the safety factor K, where B = φ × K; obtaining a total volume V of the H2O condition, the unit of the total volume V of the H2O condition being m³ / h, and calculating a total amount A of the exhaust air discharged from the exhaust fan to the external environment according to the total volume V of the H2O condition and the solvent control content B; where A = V / B, and the unit of the total amount A of the exhaust air is m³ / h; adjusting the air volume of the fresh air sucked from the external environment by the intake fan according to the total amount A of the exhaust air.

[0007] Further, when obtaining the total volume V under H2O conditions, the air volume adjustment method for the negative electrode coater of the secondary battery includes: obtaining the standard volume V1 of H2O, the temperature constant T0, and the temperature T1 in the oven to calculate the total volume V under H2O conditions; wherein, the calculation formula for the total volume V under H2O conditions is V = V1×(T0 + T1) / T0, the unit of the standard volume V1 of H2O is Nm³ / h, the unit of the temperature constant T0 is °C, and the unit of the temperature T1 in the oven is °C.

[0008] Further, when obtaining the standard volume V1 of H2O, the air volume adjustment method for the negative electrode coater of the secondary battery includes: obtaining the hourly mass G of the solvent and the molecular weight M of the solvent to calculate the standard volume V1 of H2O; wherein, the calculation formula for the standard volume of H2O is V1 = 22.4×G / M, the unit of the hourly mass G of the solvent is kg / h, and the unit of the molecular weight M of the solvent is g / mol.

[0009] Further, when obtaining the hourly mass G of the solvent, the air volume adjustment method for the negative electrode coater of the secondary battery includes: obtaining the flow rate Q of the single-sided slurry and the solid content E to calculate the hourly mass G of the solvent; wherein, the calculation formula for the hourly mass G of the solvent is G = Q×(1 - E), and the unit of the flow rate Q of the single-sided slurry is kg / h.

[0010] Further, when obtaining the flow rate Q of the single-sided slurry, the air volume adjustment method for the negative electrode coater of the secondary battery includes: obtaining the coating speed v, the coating width H, and the dry film surface density ρ to calculate the flow rate Q of the single-sided slurry; wherein, the calculation formula for the flow rate of the single-sided slurry is Q = (v×60×(H / 1000)×ρ / 1000) / E; the unit of the coating speed v is m / min, the unit of the coating width H is mm, and the unit of the dry film surface density ρ is g / ㎡.

[0011] Further, the air volume adjustment method for the negative electrode coater of the secondary battery includes: obtaining the number of layers N of the oven in the negative electrode coater to calculate the total exhaust air volume Z of the negative electrode coater; wherein, the calculation formula for the total exhaust air volume Z of the negative electrode coater is Z = A×N, and the unit of the total exhaust air volume Z of the negative electrode coater is m³ / h.

[0012] According to another aspect of the present invention, there is provided an air volume adjustment system for a negative electrode coater of a secondary battery, which is applicable to the air volume adjustment method for the negative electrode coater of the secondary battery described above. The air volume adjustment system for the negative electrode coater of the secondary battery includes: an oven; an exhaust air fan, the inlet of which is connected to the outlet of the oven; an intake air fan, the outlet of which is connected to the inlet of the oven; a heat exchanger, which includes a first pipeline and a second pipeline that can exchange heat with each other. The outlet of the exhaust air fan is connected to the first end of the first pipeline, and the second end of the first pipeline is communicated with the external environment; the inlet of the intake air fan is connected to the first end of the second pipeline, and the second end of the second pipeline is communicated with the external environment; a first detection component, which is arranged at the second end of the first pipeline for detecting the first humidity of the exhaust air discharged from the exhaust air fan to the external environment; a second detection component, which is arranged at the second end of the second pipeline for detecting the second humidity of the fresh air drawn by the intake air fan from the external environment; an industrial control computer, which is connected to both the first detection component and the second detection component for receiving the first humidity and the second humidity, calculating the total amount A of the exhaust air discharged from the exhaust air fan to the external environment according to the humidity difference between the first humidity and the second humidity, and adjusting the air volume of the fresh air drawn by the intake air fan from the external environment according to the total amount A of the exhaust air.

[0013] Further, the air volume adjustment system for the negative electrode coater of the secondary battery further includes: an exhaust duct, the first end of which is connected to the second end of the first pipeline, and the second end of which extends to the external environment; an intake duct, the first end of which is connected to the second end of the second pipeline, and the second end of which extends to the external environment.

[0014] Further, the air volume adjustment system for the negative electrode coater of the secondary battery further includes a primary filter, which is arranged in the intake duct, and the second detection component is arranged in the intake duct and on the side away from the heat exchanger of the primary filter.

[0015] Further, the air volume adjustment system for the negative electrode coater of the secondary battery further includes a medium - efficiency filter, which is arranged on the connecting pipeline between the inlet of the intake air fan and the first end of the second pipeline.

[0016] Applying the technical solution of the present invention, the method for adjusting the air volume of the negative electrode coater of the secondary battery of the present invention includes: obtaining the first humidity of the exhaust air discharged from the exhaust fan connected to the oven of the first layer of the negative electrode coater in the air volume adjustment system of the negative electrode coater of the secondary battery to the external environment and the second humidity of the fresh air sucked from the external environment by the intake fan connected to the oven of the first layer of the negative electrode coater in the air volume adjustment system of the negative electrode coater of the secondary battery; calculating the humidity difference between the first humidity and the second humidity to obtain the volume fraction φ, and the volume fraction φ is equal to the humidity difference; obtaining the safety factor K, and calculating the solvent control content B according to the volume fraction φ and the safety factor K, where B = φ×K; obtaining the total volume V of the H2O working condition, and the unit of the total volume V of the H2O working condition is m³ / h, and calculating the total amount A of the exhaust air discharged from the exhaust fan to the external environment according to the total volume V of the H2O working condition and the solvent control content B; where A = V / B, and the unit of the total amount A of the exhaust air is m³ / h; adjusting the air volume of the fresh air sucked from the external environment by the intake fan according to the total amount A of the exhaust air. In this way, the method for adjusting the air volume of the negative electrode coater of the secondary battery of the present invention can realize the precise calculation and adjustment of the total amount of the exhaust air discharged from the exhaust fan to the external environment by monitoring the humidity of the fresh air and the exhaust air in real time, accurately calculating the humidity difference between the fresh air and the exhaust air, and combining the safety factor and the total volume of the H2O working condition. Finally, the automation of the air volume adjustment of the negative electrode coater of the secondary battery is realized, the control accuracy of the dry and wet degree of the electrode sheet during the coating process is significantly improved, thereby ensuring the consistency of the product quality, solving the problem in the prior art that the air volume of the negative electrode coater cannot be adjusted in real time according to the external environment, avoiding the subjectivity and lag of manual adjustment, improving the energy utilization efficiency of the coater, reducing the production cost, enhancing the environmental adaptability and stability of the coater, and providing a strong guarantee for the continuous and stable production of lithium-ion batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention, and the schematic embodiments and descriptions thereof are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0018] Figure 1 shows a schematic structural diagram of an embodiment of an air volume adjustment system for a negative electrode coater of a secondary battery according to the present invention;

[0019] Figure 2 shows a flowchart of an embodiment of a method for adjusting the air volume of a negative electrode coater of a secondary battery according to the present invention;

[0020] Figure 3 shows through Figure 2 a process table for specifically calculating the air volume of the negative electrode coater by the method for adjusting the air volume of the negative electrode coater of the secondary battery shown.

[0021] Among them, the above-mentioned drawings include the following reference numerals:

[0022] 1. Oven; 2. Exhaust fan; 3. Inlet air fan; 4. Heat exchanger; 5. First detection component; 6. Second detection component; 7. Industrial control computer; 8. Exhaust duct; 9. Inlet air duct; 10. Primary filter; 11. Intermediate filter. Specific embodiments

[0023] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0024] As Figures 1 to 3 shown, the present invention provides a method for adjusting the air volume of the negative electrode coater of a secondary battery, including: obtaining the first humidity of the exhaust air discharged from the exhaust fan 2 connected to the oven 1 of the first layer of the negative electrode coater in the air volume adjustment system of the negative electrode coater of the secondary battery to the external environment, and the second humidity of the fresh air sucked from the external environment by the inlet air fan 3 connected to the oven 1 of the first layer of the negative electrode coater in the air volume adjustment system of the negative electrode coater of the secondary battery; calculating the humidity difference between the first humidity and the second humidity to obtain the volume fraction φ, where the volume fraction φ is equal to the humidity difference; obtaining the safety factor K, and calculating the solvent control content B according to the volume fraction φ and the safety factor K, where B = φ × K; obtaining the total volume V of the H2O working condition, the unit of the total volume V of the H2O working condition is m³ / h, and calculating the total amount A of the exhaust air discharged from the exhaust fan 2 to the external environment according to the total volume V of the H2O working condition and the solvent control content B; where A = V / B, and the unit of the total amount A of the exhaust air is m³ / h; adjusting the air volume of the fresh air sucked from the external environment by the inlet air fan 3 according to the total amount A of the exhaust air.

[0025] In this way, the method for adjusting the air volume of the negative electrode coater of the secondary battery of the present invention can accurately calculate and adjust the total amount of the exhaust air discharged from the exhaust fan 2 to the external environment by real-time monitoring the humidity of the fresh air and the exhaust air, and precisely calculating the humidity difference between the fresh air and the exhaust air, and combining the safety factor and the total volume of the H2O working condition. Finally, the automation of the air volume adjustment of the negative electrode coater of the secondary battery is realized, the control accuracy of the dry and wet degree of the electrode sheet during the coating process is significantly improved, thereby ensuring the consistency of the product quality, solving the problem in the prior art that the air volume of the negative electrode coater cannot be adjusted in real time according to the external environment, avoiding the subjectivity and lag of manual adjustment, improving the energy utilization efficiency of the coater, reducing the production cost, enhancing the environmental adaptability and stability of the coater, and providing a strong guarantee for the continuous and stable production of lithium-ion batteries.

[0026] Specifically, the external environment is an outdoor environment. The total amount A of the exhaust air discharged by the exhaust fan 2 to the external environment is a value obtained through theoretical calculation. After the calculation is completed, the air volume of the fresh air drawn in by the intake fan 3 from the external environment needs to be adjusted to be equal to the total amount A of the exhaust air discharged by the exhaust fan 2 to the external environment.

[0027] The air volume adjustment method of the negative electrode coater of the secondary battery of the present invention is compared with the air volume adjustment method in the prior art as follows:

[0028] (1) For the negative electrode coater using the air volume adjustment method in the prior art, the time for making the first piece in the coating process is one hour (including the test time). The negative electrode coater using the air volume adjustment method of the negative electrode coater of the secondary battery of the present invention can shorten it to 45 minutes, and the production efficiency is increased by 25%.

[0029] (2) For the negative electrode coater using the air volume adjustment method in the prior art, among various abnormal indicators of the electrode sheet, the cracking or excessive water content of the electrode sheet accounts for more than 10%. However, the negative electrode coater using the air volume adjustment method of the negative electrode coater of the secondary battery of the present invention can effectively avoid the above problems by detecting the water content of the fresh air and automatically adjusting the oven air frequency, thereby reducing the defective rate of the electrode sheet by 30% and improving the consistency of product quality.

[0030] (3) In terms of energy consumption, the negative electrode coater using the air volume adjustment method in the prior art can accurately adjust the motor frequency modulation to 1 Hz to reduce the energy consumption by more than 2%.

[0031] As Figure 3 shown, when obtaining the total volume V of the H2O working condition, the air volume adjustment method of the negative electrode coater of the secondary battery includes: obtaining the standard volume V1 of H2O, the temperature constant T0, and the temperature T1 in the oven 1 to calculate the total volume V of the H2O working condition; wherein, the calculation formula for the total volume V of the H2O working condition is V = V1×(T0 + T1) / T0. The unit of the standard volume V1 of H2O is Nm³ / h, the unit of the temperature constant T0 is °C, and the unit of the temperature T1 in the oven 1 is °C. In this way, by using the ideal gas state equation and considering the influence of temperature on the gas volume, through calculating the volume under the standard condition and the actual temperature in the oven, the accurate control of the total volume of the H2O working condition is realized, the adaptability of the negative electrode coater to the environmental temperature change is improved, and the adaptability of the air volume of the negative electrode coater to the temperature change is ensured.

[0032] As Figure 3As shown, when obtaining the standard condition volume V1 of H2O, the air volume adjustment method for the negative electrode coater of a secondary battery includes: obtaining the hourly mass G of the solvent and the molecular weight M of the solvent to calculate the standard condition volume V1 of H2O; wherein, the calculation formula for the standard condition volume of H2O is V1 = 22.4×G / M, the unit of the hourly mass G of the solvent is kg / h, and the unit of the molecular weight M of the solvent is g / mol. Based on the concept of molar volume, by obtaining the hourly mass G of the solvent and the molecular weight M of the solvent, the volume of H2O under standard conditions is obtained, providing accurate data support for subsequent air volume calculation, ensuring the accuracy of air volume calculation, and realizing the refined management of the coating process.

[0033] As Figure 3 shown, when obtaining the hourly mass G of the solvent, the air volume adjustment method for the negative electrode coater of a secondary battery includes: obtaining the flow rate Q of the single-sided slurry and the solid content E to calculate the hourly mass G of the solvent; wherein, the calculation formula for the hourly mass G of the solvent is G = Q×(1 - E), and the unit of the flow rate Q of the single-sided slurry is kg / h. Based on the principle of material balance, by calculating and obtaining the flow rate Q of the single-sided slurry and the solid content E, the hourly mass G of the solvent is obtained, providing basic data for the subsequent calculation of the air volume of the negative electrode coater. The implementation effect is to improve the adaptability of the coater to changes in the slurry composition and ensure the solvent control during the coating process. The application scenario is in the production process of the coater, especially in the link where the slurry composition needs to be adjusted, and the dynamic control of the air volume of the negative electrode coater can be realized by automatically calculating the hourly mass of the solvent, improving production flexibility and product consistency.

[0034] As Figure 3 shown, when obtaining the flow rate Q of the single-sided slurry, the air volume adjustment method for the negative electrode coater of a secondary battery includes: obtaining the coating speed v, the coating width H, and the dry film surface density ρ to calculate the flow rate Q of the single-sided slurry; wherein, the calculation formula for the flow rate of the single-sided slurry is Q = (v×60×(H / 1000)×ρ / 1000) / E; the unit of the coating speed v is m / min, the unit of the coating width H is mm, and the unit of the dry film surface density ρ is g / ㎡. Based on the working principle of the coater, by obtaining the coating speed v, the coating width H, and the dry film surface density ρ, the flow rate Q of the single-sided slurry is obtained, providing data support for the subsequent calculation of the hourly mass G of the solvent, improving the adaptability of the coater to changes in production parameters, ensuring the slurry control during the coating process, realizing the precise control of the air volume of the negative electrode coater, and improving production efficiency and product quality.

[0035] As Figure 3 shown, the air volume adjustment method for the negative electrode coater of a secondary battery includes: obtaining the number of layers N of the oven 1 in the negative electrode coater to calculate the total exhaust air volume Z of the negative electrode coater; wherein, the calculation formula for the total exhaust air volume Z of the negative electrode coater is Z = A×N, and the unit of the total exhaust air volume Z of the negative electrode coater is m³ / h.

[0036] Specifically, the total amount A of the exhaust air discharged by the exhaust fan 2 to the external environment is the exhaust air volume of the single-layer oven 1. Considering that the negative electrode coater may include multiple layers of ovens 1, each layer of oven 1 is respectively connected to an exhaust fan and an intake fan. By multiplying the exhaust air volume A of the single-layer oven by the number of layers N of the ovens 1 in the negative electrode coater, the total exhaust air volume Z of the entire negative electrode coater can be obtained, providing comprehensive data support for the air volume adjustment of the negative electrode coater of the secondary battery, improving the accuracy of the air volume adjustment of the multiple-layer ovens of the negative electrode coater, ensuring the control of humidity and temperature during the coating process of the negative electrode coater, and improving production efficiency and product quality.

[0037] Preferably, the negative electrode coater includes two layers of ovens 1.

[0038] In the present application Figure 3 The specific interpretations of the names of each parameter are as follows:

[0039] The coating speed v refers to the speed at which the negative electrode coater coats the active material on the base film per unit time, usually in meters per minute (m / min). The coating speed v is a fixed index, and the coating speed needs to be comprehensively determined according to the characteristics of the slurry, the performance of the coater, and the process requirements, heating method, and performance of the oil pipe system required by the product;

[0040] The coating width H is the width of the coating, which should match the winding or stacking process adopted in the subsequent process, usually in millimeters (mm). The coating width H is a fixed index, and the selection of the coating width needs to be jointly determined by various factors such as the specifications, design, accuracy, and stability of the battery production equipment, the requirements of the battery production process, the coating uniformity, and the characteristics of the slurry;

[0041] The dry coating surface density ρ refers to the mass per unit area of the active material coated on the substrate after drying during the battery manufacturing process, usually in grams per square meter (g / m²). The dry coating surface density ρ is a fixed index. The dry coating surface density is an important parameter in battery manufacturing, directly affecting the performance and energy density of the battery. The dry coating surface density needs to be determined according to material characteristics, process parameters, equipment factors, and the drying process;

[0042] The solid content (mass ratio) E refers to the proportion of solid substances in the material under specific conditions, usually expressed as a mass percentage. In battery manufacturing, the solid content refers to the percentage of solid components (such as active materials, conductive agents, binders, etc.) in the battery slurry in the total mass of the slurry. The solid content (mass ratio) E is a fixed index, and the solid content is determined by the characteristics of the slurry, process parameters, equipment performance, battery performance, and environmental factors, etc.;

[0043] The solvent type is usually water;

[0044] The molecular weight M of the solvent refers to the mass of the solvent molecules, usually expressed in grams per mole (g / mol). The molecular weight M of the solvent is a constant. In battery manufacturing, the size of the solvent molecular weight will affect its physical and chemical properties, thereby affecting the performance of the battery;

[0045] The volume fraction φ is a dimensionless quantity, usually expressed as a percentage (%). In the present invention, the volume fraction φ is used for the humidity difference monitored in real time, that is, the humidity difference between the first humidity and the second humidity;

[0046] The temperature constant T0 is the conversion constant between Celsius temperature and Kelvin temperature. The temperature constant T0 is a constant, that is, 273.15 °C;

[0047] The safety factor K is a constant, and 100% is adopted here;

[0048] The solvent control content (volume ratio) B refers to the proportional relationship between the volume of the solvent and the total volume of the solvent and the solute. It is usually used to describe the relative content of the solvent in the solution to ensure that the concentration and performance of the solution meet specific requirements. The solvent control content (volume ratio) B is related to the humidity difference monitored in real time;

[0049] The flow rate Q of the single-sided slurry refers to the volume of the slurry passing through a certain cross-section per unit time, usually expressed in cubic meters per second (m³ / s) or other related units. The flow rate Q of the single-sided slurry is an automatically calculated value;

[0050] The hourly mass G of the solvent refers to the mass of the solvent per unit time, usually expressed in kilograms per hour (kg / h), and is used to describe the consumption or supply of the solvent per unit time. The hourly mass G of the solvent is an automatically calculated value;

[0051] The standard condition volume V1 of H2O refers to the volume of water under standard conditions (0 °C, 101.325 kPa). Under standard conditions, the volume of 1 mole of any ideal gas is about 22.4 L / mol. However, it should be noted that water is in a liquid state rather than a gaseous state under standard conditions, so 22.4 L / mol cannot be directly used to describe the volume of water. The standard condition volume V1 of H2O is an automatically calculated value;

[0052] The temperature T1 inside the oven refers to the actual temperature inside the oven. The temperature T1 inside the oven is a fixed index, which is a value preset manually and needs to be determined according to slurry characteristics, process parameters, equipment performance, material characteristics, environmental factors, and quality control requirements, etc.;

[0053] The ambient temperature T2 outside the oven. The ambient temperature T2 outside the oven is the temperature monitored in real time and is set at 30 °C here;

[0054] The total volume V under H2O operating conditions refers to the volume of water under actual working conditions (operating conditions). Operating conditions usually refer to environmental parameters such as temperature and pressure in actual operation. The total volume V under H2O operating conditions is an automatically calculated value;

[0055] The total exhaust air volume A after dilution is the total volume of the exhaust air discharged by the exhaust fan 2 to the external environment, with the unit of cubic meters per hour (m³ / h). The total exhaust air volume A after dilution is an automatically calculated value;

[0056] The total air volume Z of the double-layer oven refers to the total exhaust air volume of the negative electrode coater, with the unit of cubic meters per hour (m³ / h). The total air volume Z of the double-layer oven is an automatically calculated value.

[0057] Among them, the fixed index refers to a preset index for standardized evaluation. It does not refer to a value that is completely fixed at all times, but a value that does not change during a continuous production process; a constant refers to a parameter that always remains unchanged, and an automatically calculated value refers to a value dynamically calculated based on input or conditions.

[0058] When calculating the air volume of the negative electrode coater in the air volume adjustment system of the negative electrode coater for secondary batteries, we can show the calculation process through the following specific embodiments to illustrate how the air volume adjustment system of the negative electrode coater for secondary batteries automatically calculates and adjusts the air volume of the negative electrode coater according to different external conditions to ensure that the humidity of the environment in the oven 1 of the negative electrode coater meets the process requirements.

[0059] Embodiment 1:

[0060] The known conditions are: the solvent type is H2O (i.e., water), the coating speed v = 80 m / min, the coating width H = 1000 mm, the dry film surface density ρ = 110 g / ㎡, the solid content (mass ratio) E = 53.0%, the humidity difference between the first humidity and the second humidity = 5.00%, the solvent molecular weight M = 18 g / mol, the temperature constant T0 = 273.15 °C, the safety factor K = 100%, the temperature T1 in the oven 1 = 120 °C, and the temperature T2 of the environment outside the oven 1 = 30 °C;

[0061] The calculation process is as follows:

[0062] The volume fraction φ = 5.00%;

[0063] The solvent control content (volume ratio) B = φ × K = 5.00% × 100% = 5.00%;

[0064] The flow rate Q of the single-sided slurry = (v × 60 × (H / 1000) × ρ / 1000) / E = (80 × 60 × (1000 / 1000) × 110 / 1000) / 53.0% = 996.23 kg / h;

[0065] The hourly mass of the solvent G = Q×(1 - E) = 996.23×(1 - 53.0%) = 468.23 kg / h;

[0066] The standard condition volume of H2O V1 = 22.4×G / M = 22.4×468.23 / 18 = 582.68 Nm³ / h;

[0067] The total volume of H2O under operating conditions V = V1×(T0 + T1) / T0 = 582.68×(273.15 + 120) / 273.15 = 838.7 m³ / h;

[0068] The total diluted exhaust air volume A discharged to the external environment by the exhaust fan (2) = V / B = 838.7 / 5.00% = 16773.3 m³ / h;

[0069] The total air volume of the double-layer oven Z = 2×A = 16773.3 = 2×33546.6 m³ / h.

[0070] Example 2:

[0071] The known conditions are: the solvent type is H2O (i.e., water), the coating speed v = 80 m / min, the coating width H = 1000 mm, the dry film surface density ρ = 110 g / ㎡, the solid content (mass ratio) E = 53.0%, the humidity difference between the first humidity and the second humidity = 1.50%, the solvent molecular weight M = 18 g / mol, the temperature constant T0 = 273.15 °C, the safety factor K = 100%, the temperature inside oven 1 T1 = 120 °C, and the ambient temperature outside oven 1 T2 = 30 °C;

[0072] The calculation process is as follows:

[0073] The volume fraction φ = 1.50%;

[0074] The solvent control content (volume ratio) B = φ×K = 1.50%×100% = 1.50%;

[0075] The flow rate of the single-sided slurry Q = (v×60×(H / 1000)×ρ / 1000) / E = (80×60×(1000 / 1000)×110 / 1000) / 53.0% = 996.23 kg / h;

[0076] The hourly mass of the solvent G = Q×(1 - E) = 996.23×(1 - 53.0%) = 468.23 kg / h;

[0077] The standard condition volume of H2O V1 = 22.4×G / M = 22.4×468.23 / 18 = 582.68 Nm³ / h;

[0078] The total volume V under H2O conditions = V1×(T0 + T1) / T0 = 582.68×(273.15 + 120) / 273.15 = 838.7 m³ / h;

[0079] The total diluted exhaust air volume A discharged to the external environment by the exhaust fan (2) = V / B = 838.7 / 1.50% = 55911.0 m³ / h;

[0080] The total air volume Z of the double-layer oven = 2×A = 2×55911.0 = 111822.0 m³ / h.

[0081] Example 3:

[0082] Known conditions are: solvent type is H2O (i.e., water), coating speed v = 80 m / min, coating width H = 1000 mm, dry film surface density ρ = 110 g / ㎡, solid content (mass ratio) E = 53.0%, humidity difference between the first humidity and the second humidity = 0.50%, solvent molecular weight M = 18 g / mol, temperature constant T0 = 273.15 °C, safety factor K = 100%, temperature T1 inside oven 1 = 120 °C, ambient temperature T2 outside oven 1 = 30 °C;

[0083] The calculation process is as follows:

[0084] Volume fraction φ = 0.50%;

[0085] Solvent control content (volume ratio) B = φ×K = 0.50%×100% = 0.50%;

[0086] The flow rate Q of the single-sided slurry = (v×60×(H / 1000)×ρ / 1000) / E = (80×60×(1000 / 1000)×110 / 1000) / 53.0% = 996.23 kg / h;

[0087] The hourly mass G of the solvent = Q×(1 - E) = 996.23×(1 - 53.0%) = 468.23 kg / h;

[0088] The standard volume V1 of H2O = 22.4×G / M = 22.4×468.23 / 18 = 582.68 Nm³ / h;

[0089] The total volume V under H2O conditions = V1×(T0 + T1) / T0 = 582.68×(273.15 + 120) / 273.15 = 838.7 m³ / h;

[0090] The total diluted exhaust air volume A discharged to the external environment by the exhaust fan (2) = V / B = 838.7 / 0.50% = 167733.0 m³ / h;

[0091] The total air volume of the double-layer oven Z = 2×A = 2×167733.0 = 335466.0 m³ / h.

[0092] Example 4:

[0093] The known conditions are: the solvent type is H2O (i.e., water), the coating speed v = 80 m / min, the coating width H = 1000 mm, the dry film surface density ρ = 110 g / ㎡, the solid content (mass ratio) E = 53.0%, the humidity difference between the first humidity and the second humidity = 1.50%, the solvent molecular weight M = 18 g / mol, the temperature constant T0 = 273.15 °C, the safety factor K = 100%, the temperature T1 inside oven 1 = 130 °C, and the ambient temperature T2 outside oven 1 = 30 °C;

[0094] The calculation process is as follows:

[0095] The volume fraction φ = 1.50%;

[0096] The solvent control content (volume ratio) B = φ×K = 1.50%×100% = 1.50%;

[0097] The flow rate Q of the single-sided slurry = (v×60×(H / 1000)×ρ / 1000) / E = (80×60×(1000 / 1000)×110 / 1000) / 53.0% = 996.23 kg / h;

[0098] The hourly mass G of the solvent = Q×(1 - E) = 996.23×(1 - 53.0%) = 468.23 kg / h;

[0099] The standard volume V1 of H2O = 22.4×G / M = 22.4×468.23 / 18 = 582.68 Nm³ / h;

[0100] The total volume V of H2O under operating conditions = V1×(T0 + T1) / T0 = 582.68×(273.15 + 130) / 273.15 = 860.0 m³ / h;

[0101] The total diluted exhaust air volume A discharged to the external environment by the exhaust fan (2) = V / B = 860.0 / 1.50% = 57333.1 m³ / h;

[0102] The total air volume of the double-layer oven Z = 2×A = 2×57333.1 = 114666.3 m³ / h.

[0103] Example 5:

[0104] The known conditions are as follows: the solvent type is H2O (i.e., water), the coating speed v = 50 m / min, the coating width H = 1000 mm, the dry film surface density ρ = 110 g / ㎡, the solid content (mass ratio) E = 53.0%, the humidity difference between the first humidity and the second humidity = 1.50%, the solvent molecular weight M = 18 g / mol, the temperature constant T0 = 273.15 °C, the safety factor K = 100%, the temperature inside oven 1 is T1 = 120 °C, and the ambient temperature outside oven 1 is T2 = 30 °C;

[0105] The calculation process is as follows:

[0106] The volume fraction φ = 1.50%;

[0107] The solvent control content (volume ratio) B = φ × K = 1.50% × 100% = 1.50%;

[0108] The flow rate Q of the single-sided slurry = (v × 60 × (H / 1000) × ρ / 1000) / E = (50 × 60 × (1000 / 1000) × 110 / 1000) / 53.0% = 622.64 kg / h;

[0109] The hourly mass G of the solvent = Q × (1 - E) = 622.64 × (1 - 53.0%) = 292.64 kg / h;

[0110] The standard volume V1 of H2O = 22.4 × G / M = 22.4 × 292.64 / 18 = 364.18 Nm³ / h;

[0111] The total volume V under operating conditions of H2O = V1 × (T0 + T1) / T0 = 364.18 × (273.15 + 120) / 273.15 = 524.2 m³ / h;

[0112] The total diluted exhaust air volume A discharged to the external environment by the exhaust fan (2) = V / B = 524.2 / 1.50% = 34944.4 m³ / h;

[0113] The total air volume Z of the double-layer oven = 2 × A = 2 × 34944.4 = 69888.7 m³ / h.

[0114] Example 6:

[0115] The known conditions are as follows: the solvent type is H2O (i.e., water), the coating speed v = 80 m / min, the coating width H = 800 mm, the dry film surface density ρ = 110 g / ㎡, the solid content (mass ratio) E = 53.0%, the humidity difference between the first humidity and the second humidity = 1.50%, the solvent molecular weight M = 18 g / mol, the temperature constant T0 = 273.15 °C, the safety factor K = 100%, the temperature T1 in oven 1 = 120 °C, and the ambient temperature T2 outside oven 1 = 30 °C;

[0116] The calculation process is as follows:

[0117] The volume fraction φ = 1.50%;

[0118] The solvent control content (volume ratio) B = φ × K = 1.50% × 100% = 1.50%;

[0119] The flow rate Q of the single-sided slurry = (v × 60 × (H / 1000) × ρ / 1000) / E = (80 × 60 × (800 / 1000) × 110 / 1000) / 53.0% = 796.98 kg / h;

[0120] The hourly mass G of the solvent = Q × (1 - E) = 796.98 × (1 - 53.0%) = 374.58 kg / h;

[0121] The standard volume V1 of H2O = 22.4 × G / M = 22.4 × 374.58 / 18 = 466.15 Nm³ / h;

[0122] The total volume V under working conditions of H2O = V1 × (T0 + T1) / T0 = 466.15 × (273.15 + 120) / 273.15 = 670.9 m³ / h;

[0123] The total diluted exhaust air volume A discharged to the external environment by the exhaust fan (2) = V / B = 670.9 / 1.50% = 44728.8 m³ / h;

[0124] The total air volume Z of the double-layer oven = 2 × A = 2 × 44728.8 = 89457.6 m³ / h.

[0125] Through the above-mentioned multiple embodiments, the total exhaust air volume of the negative electrode coater can be automatically calculated and adjusted according to the external environmental parameters under different conditions, so as to ensure that the humidity difference in oven 1 of the negative electrode coater meets the process requirements, thereby improving the product quality and production efficiency, and at the same time reducing energy waste.

[0126] Such as Figure 1As shown in the figure, the present invention also provides an air volume adjustment system for the negative electrode coater of a secondary battery, which is applicable to the air volume adjustment method for the negative electrode coater of the above-mentioned secondary battery. The air volume adjustment system for the negative electrode coater of the secondary battery includes: an oven 1; an exhaust fan 2, the inlet of the exhaust fan 2 is connected to the outlet of the oven 1; an intake fan 3, the outlet of the intake fan 3 is connected to the inlet of the oven 1; a heat exchanger 4, the heat exchanger 4 includes a first pipeline and a second pipeline that can exchange heat with each other, the outlet of the exhaust fan 2 is connected to the first end of the first pipeline, and the second end of the first pipeline is communicated with the external environment; the inlet of the intake fan 3 and the first end of the second pipeline are connected, and the second end of the second pipeline is communicated with the external environment; a first detection component 5, arranged at the second end of the first pipeline, for detecting the first humidity of the exhaust air discharged from the exhaust fan 2 to the external environment; a second detection component 6, arranged at the second end of the second pipeline, for detecting the second humidity of the fresh air sucked by the intake fan 3 from the external environment; an industrial control computer 7, the industrial control computer 7 is connected to both the first detection component 5 and the second detection component 6, for receiving the first humidity and the second humidity, calculating the total amount A of the exhaust air discharged from the exhaust fan 2 to the external environment according to the humidity difference between the first humidity and the second humidity, and adjusting the air volume of the fresh air sucked by the intake fan from the external environment according to the total amount A of the exhaust air.

[0127] In this way, the air volume adjustment system for the negative electrode coater of the present invention realizes the real-time monitoring and automatic adjustment of the air volume of the negative electrode coater by integrating a variety of devices and sensors, can quickly respond to changes in the external environment, thereby improving the control accuracy of the humidity during the coating process of the negative electrode coater, significantly improving the consistency and yield of the produced products. Its application scenarios are mainly on the production line of lithium-ion batteries, especially in areas with large changes in environmental humidity, and can effectively cope with environmental changes to ensure the stability and high efficiency of the coating process.

[0128] Specifically, the exhaust air volume of the exhaust fan 2 is less than the intake air volume of the intake fan 3 to ensure that the exhaust fan 2 has sufficient air volume to discharge; the heat exchanger 4 is a gas-gas heat exchanger, and a gas-gas heat exchanger is a device used to transfer heat between gases at different temperatures. It realizes the heat transfer from the high-temperature gas to the low-temperature gas through heat conduction, convection and radiation, etc., so as to achieve the purpose of energy conservation and improve the energy utilization efficiency; the first detection component 5 can be a humidity sensor or a temperature and humidity sensor; the second detection component 6 can also be a humidity sensor or a temperature and humidity sensor.

[0129] Such as Figure 1As shown in the figure, the air volume adjustment system of the negative electrode coater for secondary batteries further includes: an exhaust duct 8, the first end of the exhaust duct 8 is connected to the second end of the first pipeline, and the second end of the exhaust duct 8 extends to the external environment; an intake duct 9, the first end of the intake duct 9 is connected to the second end of the second pipeline, and the second end of the intake duct 9 extends to the external environment. In this way, through the reasonable setting of the exhaust duct 8 and the intake duct 9, the rapid and efficient adjustment of the air volume can be achieved, improving the air volume adjustment efficiency of the negative electrode coater, reducing the energy loss during the air volume adjustment process of the negative electrode coater, reducing the production cost, improving the production efficiency and product quality, and facilitating maintenance and management at the same time.

[0130] As Figure 1 shown in the figure, the air volume adjustment system of the negative electrode coater for secondary batteries further includes a primary filter 10. The primary filter 10 is arranged in the intake duct 9, and the second detection component 6 is arranged in the intake duct 9 and on the side away from the heat exchanger 4 of the primary filter 10 to preliminarily filter the fresh air to enter the negative electrode coater, remove large particle impurities, ensure the cleanliness of the fresh air, thereby improving the cleanliness and drying efficiency during the coating process of the negative electrode coater, reducing the risk of electrode sheet contamination, and improving the consistency and yield of the product.

[0131] As Figure 1 shown in the figure, the air volume adjustment system of the negative electrode coater for secondary batteries further includes an intermediate filter 11. The intermediate filter 11 is arranged on the connecting pipeline between the inlet of the intake fan 3 and the first end of the second pipeline to further filter the fresh air after passing through the primary filter, remove minute particle impurities, ensure the high cleanliness of the fresh air, thereby improving the drying efficiency and product quality during the coating process of the negative electrode coater, improving the filtering effect of the coater on the fresh air, ensuring the cleanliness of the coating process, reducing the risk of electrode sheet contamination, improving the consistency and yield of the product, ensuring the cleanliness of the coating process, improving the production efficiency and product quality, realizing the precise control of the coating process, reducing the production cost, and providing strong technical support for the sustainable development of the lithium-ion battery industry.

[0132] The working process of the air volume adjustment of the negative electrode coater for secondary batteries of the present invention is as follows:

[0133] The fresh air in the external environment is driven by the intake fan 3 to pass through the primary filter 10, and after coming out of the primary filter 10, it enters the second pipeline of the heat exchanger 4. Then, after coming out of the second pipeline of the heat exchanger 4, it passes through the medium - efficiency filter 11, and then after coming out of the medium - efficiency filter 11, it enters the corresponding oven 1 of the negative electrode coater to participate in the baking of the electrode sheet, and carries water vapor. Driven by the exhaust fan 2, it enters the first pipeline of the heat exchanger 4, and exchanges heat with the fresh air in the second pipeline of the heat exchanger 4, and finally is discharged into the external environment. Among them, the fresh air and the exhaust air are respectively detected for humidity by the first detection component 5 and the second detection component 6 and then fed back to the industrial control computer 7. The industrial control computer 7 will calculate the humidity difference between them based on the current first humidity and second humidity, then calculate the air volume according to the humidity difference, and finally adjust the total air volume of the negative electrode coater; adjust the air volume of the fresh air sucked by the intake fan from the external environment according to the total amount A of the exhaust air.

[0134] From the above description, it can be seen that the above - mentioned embodiments of the present invention achieve the following technical effects:

[0135] The method for adjusting the air volume of the negative electrode coater of the secondary battery of the present invention includes: obtaining the first humidity of the exhaust air discharged from the exhaust fan 2 connected to the oven 1 of the first layer of the negative electrode coater in the air volume adjustment system of the negative electrode coater of the secondary battery to the external environment and the second humidity of the fresh air sucked by the intake fan 3 from the external environment connected to the oven 1 of the first layer of the negative electrode coater in the air volume adjustment system of the negative electrode coater of the secondary battery; calculating the humidity difference between the first humidity and the second humidity to obtain the volume fraction φ, and the volume fraction φ is equal to the humidity difference; obtaining the safety factor K, and calculating the solvent control content B according to the volume fraction φ and the safety factor K, where B = φ×K; obtaining the total volume V of the H2O working condition, and the unit of the total volume V of the H2O working condition is m³ / h, and calculating the total amount A of the exhaust air discharged from the exhaust fan 2 to the external environment according to the total volume V of the H2O working condition and the solvent control content B; where A = V / B, and the unit of the total amount A of the exhaust air is m³ / h. In this way, the method for adjusting the air volume of the negative electrode coater of the secondary battery of the present invention can accurately calculate and adjust the total amount of the exhaust air discharged from the exhaust fan 2 to the external environment by real - time monitoring the humidity of the fresh air and the exhaust air, accurately calculating the humidity difference between the fresh air and the exhaust air, and combining the safety factor and the total volume of the H2O working condition. Finally, it realizes the automation of the air volume adjustment of the negative electrode coater of the secondary battery, significantly improves the control accuracy of the dry - wet degree of the electrode sheet during the coating process, thereby ensuring the consistency of the product quality, solving the problem in the prior art that the air volume of the negative electrode coater cannot be adjusted in real - time according to the external environment, avoiding the subjectivity and lag of manual adjustment, improving the energy utilization efficiency of the coater, reducing the production cost, enhancing the environmental adaptability and stability of the coater, and providing a strong guarantee for the continuous and stable production of lithium - ion batteries.

[0136] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0137] Unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods, and devices should be regarded as part of the authorized specification. In all the examples shown and discussed herein, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not require further discussion in subsequent drawings.

[0138] In the description of the present application, it should be understood that the orientation or positional relationships indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom" are generally based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus should not be construed as limiting the protection scope of the present application; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0139] For ease of description, spatial relative terms such as "above", "over", "on the upper surface", "upper" etc. can be used herein to describe the spatial positional relationship of one device or feature shown in the figures with respect to other devices or features. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, a device described as "above" or "over" other devices or structures will then be positioned "below" or "under" the other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations of the spatial relative descriptions used herein will be made.

[0140] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of differentiating the corresponding components. Without further statement, the above terms have no special meanings, and thus should not be construed as limiting the protection scope of the present application.

[0141] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for adjusting the air volume of a negative electrode coater of a secondary battery, characterized in that Including: Obtaining a first humidity of the exhaust air discharged from an exhaust air fan (2) connected to an oven (1) of the first layer of the negative electrode coater in the air volume adjustment system of the secondary battery negative electrode coater to the external environment, and a second humidity of the fresh air drawn from the external environment by an intake air fan (3) connected to the oven (1) of the first layer of the negative electrode coater in the air volume adjustment system of the secondary battery negative electrode coater; Calculating a humidity difference between the first humidity and the second humidity to obtain a volume fraction φ, where the volume fraction φ is equal to the humidity difference; Obtaining a safety factor K, and calculating a solvent control content B according to the volume fraction φ and the safety factor K, where B = φ × K; Obtaining a total volume V of the H2O condition, the unit of the total volume V of the H2O condition being m³ / h, and calculating a total amount A of the exhaust air discharged from the exhaust air fan (2) to the external environment according to the total volume V of the H2O condition and the solvent control content B; where A = V / B, and the unit of the total amount A of the exhaust air is m³ / h; Adjusting the air volume of the fresh air drawn from the external environment by the intake air fan (3) according to the total amount A of the exhaust air; When obtaining the total volume V of the H2O condition, the air volume adjustment method for the secondary battery negative electrode coater includes: Obtaining a standard volume V1 of H2O, a temperature constant T0, and a temperature T1 inside the oven (1) to calculate the total volume V of the H2O condition; Wherein, the calculation formula for the total volume V of the H2O condition is V = V1×(T0 + T1) / T0, the unit of the standard volume V1 of H2O is Nm³ / h, the unit of the temperature constant T0 is °C, and the unit of the temperature T1 inside the oven (1) is °C; When obtaining the standard volume V1 of H2O, the air volume adjustment method for the secondary battery negative electrode coater includes: Obtaining a solvent hourly mass G and a solvent molecular weight M to calculate the standard volume V1 of H2O; Wherein, the calculation formula for the standard volume of H2O is V1 = 22.4×G / M, the unit of the solvent hourly mass G is kg / h, and the unit of the solvent molecular weight M is g / mol; When obtaining the solvent hourly mass G, the air volume adjustment method for the secondary battery negative electrode coater includes: Obtaining a flow rate Q of the single-sided slurry and a solid content E to calculate the solvent hourly mass G; Wherein, the calculation formula for the solvent hourly mass G is G = Q×(1 - E), and the unit of the flow rate Q of the single-sided slurry is kg / h; When obtaining the flow rate Q of the single-sided slurry, the air volume adjustment method for the secondary battery negative electrode coater includes: Obtaining a coating speed v, a coating width H, and a dry coating surface density ρ to calculate the flow rate Q of the single-sided slurry; Wherein, the calculation formula for the flow rate of the single-sided slurry is Q = (v×60×(H / 1000)×ρ / 1000) / E; the unit of the coating speed v is m / min, the unit of the coating width H is mm, and the unit of the dry coating surface density ρ is g / ㎡.

2. The method for adjusting the air volume of the negative electrode coater of the secondary battery according to claim 1, wherein The air volume adjustment method for the secondary battery negative electrode coater includes: Obtain the number of layers N of the oven (1) in the negative electrode coater to calculate the total exhaust air volume Z of the negative electrode coater; Wherein, the calculation formula for the total exhaust air volume Z of the negative electrode coater is Z = A × N, and the unit of the total exhaust air volume Z of the negative electrode coater is m³ / h.

3. A negative electrode coating machine air volume adjustment system for a secondary battery, characterized in that, A method for adjusting the air volume of a negative electrode coater for a secondary battery according to claim 1 or 2, the air volume adjustment system of the negative electrode coater for the secondary battery comprising: An oven (1); An exhaust fan (2), the inlet of the exhaust fan (2) is connected to the outlet of the oven (1); An inlet air fan (3), the outlet of the inlet air fan (3) is connected to the inlet of the oven (1); A heat exchanger (4), the heat exchanger (4) includes a first pipeline and a second pipeline that can exchange heat with each other. The outlet of the exhaust fan (2) is connected to the first end of the first pipeline, and the second end of the first pipeline communicates with the external environment; the inlet of the inlet air fan (3) and the first end of the second pipeline are connected, and the second end of the second pipeline communicates with the external environment; A first detection component (5), arranged at the second end of the first pipeline to detect the first humidity of the exhaust air discharged from the exhaust fan (2) to the external environment; A second detection component (6), arranged at the second end of the second pipeline to detect the second humidity of the fresh air sucked by the inlet air fan (3) from the external environment; An industrial control computer (7), the industrial control computer (7) is connected to both the first detection component (5) and the second detection component (6) to receive the first humidity and the second humidity, and calculate the total amount A of the exhaust air discharged from the exhaust fan (2) to the external environment according to the humidity difference between the first humidity and the second humidity, and adjust the air volume of the fresh air sucked by the inlet air fan (3) from the external environment according to the total amount A of the exhaust air.

4. The air volume adjustment system of the negative electrode coater for a secondary battery according to claim 3, wherein The air volume adjustment system of the negative electrode coater for the secondary battery further includes: An exhaust duct (8), the first end of the exhaust duct (8) is connected to the second end of the first pipeline, and the second end of the exhaust duct (8) extends to the external environment; An inlet duct (9), the first end of the inlet duct (9) is connected to the second end of the second pipeline, and the second end of the inlet duct (9) extends to the external environment.

5. The air volume adjustment system of the negative electrode coater for a secondary battery according to claim 4, wherein The air volume adjustment system of the negative electrode coater for the secondary battery further includes a primary filter (10), the primary filter (10) is arranged in the inlet duct (9), and the second detection component (6) is arranged in the inlet duct (9) and on the side away from the heat exchanger (4) of the primary filter (10).

6. The air volume adjustment system for the negative electrode coater of the secondary battery according to claim 4 or 5, characterized in that The air volume adjustment system of the negative electrode coater for the secondary battery further includes a medium - efficiency filter (11), the medium - efficiency filter (11) is arranged on the connecting pipeline between the inlet of the inlet air fan (3) and the first end of the second pipeline.

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