Air volume adjusting method and adjusting system for negative electrode coating machine of secondary battery

Abstract

The invention relates to the technical field of lithium ion battery production, and provides an air volume adjusting method and system for a negative electrode coating machine of a secondary battery. The invention discloses an air volume adjusting method for a negative electrode coating machine of a secondary battery. The first humidity of exhaust air exhausted into the external environment by an exhaust fan connected with a drying oven on the first layer of the negative electrode coating machine in the air volume adjusting system of the negative electrode coating machine of the secondary battery and the second humidity of fresh air sucked from the external environment by an air inlet fan connected with the drying oven are obtained; calculating a humidity difference value between the first humidity and the second humidity to obtain a volume fraction phi; obtaining a safety coefficient K, and calculating the solvent control content B, B = phi * K; the H2O working condition total volume V is obtained, the total exhaust amount A of the exhaust fan is calculated, and A = V / B; the air volume of fresh air sucked by an air inlet fan is adjusted; the problem that in the prior art, the air volume of a negative electrode coating machine cannot be adjusted in real time according to the external environment is solved, and the control precision of the dryness and humidity of a pole piece in the coating process is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium ion battery production, and in particular to an air volume regulating method and a regulating system for a negative electrode coating machine of a secondary battery. Background Art

[0002] At present, in the front-end production of lithium-ion batteries, the fresh air of the negative electrode coating machine is taken from the outdoor environment, driven by the fresh air fan, passes through the filter, and exchanges air-to-air heat with the exhaust gas discharged from the coating machine. Then it enters the negative electrode coating machine, brings out the water vapor, and is driven by the exhaust fan to be discharged as exhaust gas.

[0003] In the prior art, the fresh air exhaust volume of the negative electrode coating machine often has no precise calculation and control logic. The air volume design is basically estimated based on 70% of the air volume of the positive electrode coating machine, or calculated based on 1.5% of the fresh air exhaust humidity difference. The calculation conditions are single and relatively idealized, and can only meet the basic requirements for drying the negative electrode coating machine.

[0004] However, in a changeable external environment, such as when it rains or is sunny, the external temperature and humidity will change, and it is impossible to adjust the air volume in real time according to the external environment. It can only be based on the current production conditions, such as high water content of the product, and then manually adjust the fresh air fan frequency, which causes a large waste of energy and materials. Summary of the invention

[0005] The main purpose of the present invention is to provide a method and system for regulating the air volume of a negative electrode coating machine of a secondary battery, so as to solve the problem in the prior art that the air volume of the negative electrode coating machine cannot be regulated in real time according to the external environment.

[0006] In order to achieve the above-mentioned object, according to one aspect of the present invention, there is provided a method for regulating the air volume of a negative electrode coating machine of a secondary battery, comprising: obtaining a first humidity of exhaust air discharged to the external environment by an exhaust fan connected to an oven of a first layer of the negative electrode coating machine in an air volume regulating system of the negative electrode coating machine of the secondary battery and a second humidity of fresh air drawn from the external environment by an air intake fan connected to an oven of a first layer of the negative electrode coating machine in an air volume regulating system of the negative electrode coating machine of the secondary battery; calculating a humidity difference between the first humidity and the second humidity to obtain a humidity value; The integral φ, volume fraction φ is equal to the humidity difference; obtain the safety factor K, calculate the solvent control content B according to the volume fraction φ and the safety factor K, where B=φ×K; obtain the total volume V of the H2O working condition, the unit of the total volume V of the H2O working condition is m³ / h, calculate the total amount A of 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, the unit of the total amount A of exhaust air is m³ / h; adjust the air volume of fresh air drawn from the external environment by the air inlet fan according to the total amount A of exhaust air.

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

[0008] Furthermore, when obtaining the standard volume V1 of H2O, the air volume adjustment method of the negative electrode coating machine 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 of 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] Furthermore, when obtaining the hourly mass G of the solvent, the air volume adjustment method of the negative electrode coating machine of the secondary battery includes: obtaining the flow rate Q and solid content E of the single-sided slurry to calculate the hourly mass G of the solvent; wherein, the calculation formula of 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] Furthermore, when obtaining the flow rate Q of the single-sided slurry, the air volume adjustment method of the negative electrode coating machine of the secondary battery includes: obtaining the coating speed v, the coating width H and the dry layer 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 layer density ρ is g / ㎡.

[0011] Furthermore, the air volume regulation method of 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 volume Z of the negative electrode coater; wherein, the calculation formula of the total exhaust volume Z of the negative electrode coater is Z=A×N, and the unit of the total exhaust 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 regulating system for a negative electrode coating machine of a secondary battery, which is applicable to the above-mentioned air volume regulating method for a negative electrode coating machine of a secondary battery, and the air volume regulating system for a negative electrode coating machine of a secondary battery comprises: an oven; an exhaust fan, the inlet of the exhaust fan is connected to the air outlet of the oven; an air inlet fan, the outlet of the air inlet fan is connected to the air inlet of the oven; a heat exchanger, the heat exchanger comprises a first pipeline and a second pipeline that can exchange heat with each other, the outlet of the exhaust fan is connected to the first end of the first pipeline, and the second end of the first pipeline is connected to the external environment; the inlet of the air inlet fan is connected to the first end of the second pipeline, and the second end of the second pipeline is connected to the external environment The external environment is connected; a first detection component is arranged at the second end of the first pipeline, and is used to detect a first humidity of the exhaust air discharged by the exhaust fan to the external environment; a second detection component is arranged at the second end of the second pipeline, and is used to detect a second humidity of the fresh air sucked from the external environment by the air inlet fan; an industrial computer, the industrial computer is connected to both the first detection component and the second detection component, and is used to receive the first humidity and the second humidity, so as to calculate the total amount A of the exhaust air discharged by the exhaust fan to the external environment according to the humidity difference between the first humidity and the second humidity, and to adjust the air volume of the fresh air sucked from the external environment by the air inlet fan according to the total amount A of the exhaust air.

[0013] Furthermore, the air volume regulation system of the negative electrode coating machine of the secondary battery also includes: an exhaust duct, the first end of the exhaust duct is connected to the second end of the first pipeline, and the second end of the exhaust duct extends to the external environment; an air inlet duct, the first end of the air inlet duct is connected to the second end of the second pipeline, and the second end of the air inlet duct extends to the external environment.

[0014] Furthermore, the air volume regulating system of the negative electrode coating machine of the secondary battery also includes a primary filter, which is arranged in the air inlet pipe, and the second detection component is arranged in the air inlet pipe and is located on the side of the primary filter away from the heat exchanger.

[0015] Furthermore, the air volume regulating system of the negative electrode coating machine of the secondary battery also includes a medium efficiency filter, which is arranged on the connecting pipeline between the inlet of the air inlet fan and the first end of the second pipeline.

[0016] Applying the technical solution of the present invention, the air volume regulating method of the negative electrode coating machine of the secondary battery of the present invention comprises: obtaining a first humidity of exhaust air discharged to the external environment by an exhaust fan connected to the first layer of the oven of the negative electrode coating machine in the air volume regulating system of the negative electrode coating machine of the secondary battery and a second humidity of fresh air drawn from the external environment by an air intake fan connected to the first layer of the oven of the negative electrode coating machine in the air volume regulating system of the negative electrode coating machine of the secondary battery; calculating the humidity difference between the first humidity and the second humidity to obtain a volume fraction φ, The volume fraction φ is equal to the humidity difference; the safety factor K is obtained, and the solvent control content B is calculated according to the volume fraction φ and the safety factor K, wherein B=φ×K; the total volume V of the H2O working condition is obtained, and the unit of the total volume V of the H2O working condition is m³ / h, and the total amount A of exhaust air discharged from the exhaust fan to the external environment is calculated according to the total volume V of the H2O working condition and the solvent control content B; wherein A=V / B, and the unit of the total amount A of exhaust air is m³ / h; the air volume of fresh air drawn from the external environment by the air inlet fan is adjusted according to the total amount A of exhaust air. In this way, the air volume regulation method of the negative electrode coating machine of the secondary battery of the present invention can realize the accurate calculation and regulation of the total amount of exhaust air discharged from the exhaust fan to the external environment by real-time monitoring the humidity of the fresh air and the exhaust air, and accurately calculating the humidity difference between the fresh air and the exhaust air, combined with the safety factor and the total volume of H2O working condition, and finally realizes the automation of the air volume regulation of the negative electrode coating machine of the secondary battery, significantly improves the control accuracy of the electrode dryness and wetness during the coating process, thereby ensuring the consistency of product quality, and solves the problem in the prior art that the air volume of the negative electrode coating machine cannot be adjusted in real time according to the external environment, avoids the subjectivity and lag of manual adjustment, improves the energy utilization efficiency of the coating machine, reduces the production cost, enhances the environmental adaptability and stability of the coating machine, and provides a strong guarantee for the continuous and stable production of lithium-ion batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 A schematic structural diagram of an embodiment of an air volume regulating system for a negative electrode coating machine of a secondary battery according to the present invention is shown;

[0019] Figure 2 A flow chart showing an embodiment of a method for adjusting the air volume of a negative electrode coating machine for a secondary battery according to the present invention;

[0020] Figure 3 Shown by Figure 2 The method for adjusting the air volume of the negative electrode coating machine of the secondary battery shown is a process table for specifically calculating the air volume of the negative electrode coating machine.

[0021] The above drawings include the following reference numerals:

[0022] 1. Oven; 2. Exhaust fan; 3. Inlet fan; 4. Heat exchanger; 5. First detection component; 6. Second detection component; 7. Industrial computer; 8. Exhaust duct; 9. Inlet duct; 10. Primary filter; 11. Medium filter. DETAILED DESCRIPTION

[0023] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

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

[0025] In this way, the air volume regulation method of the negative electrode coating machine of the secondary battery of the present invention monitors the humidity of the fresh air and the exhaust air in real time, and accurately calculates the humidity difference between the fresh air and the exhaust air. Combined with the safety factor and the total volume of H2O working conditions, it can realize the accurate calculation and regulation of the total amount of exhaust air discharged from the exhaust fan 2 to the external environment, and finally realizes the automation of the air volume regulation of the negative electrode coating machine of the secondary battery, significantly improves the control accuracy of the electrode dryness and wetness during the coating process, thereby ensuring the consistency of product quality, and solves the problem in the prior art that the air volume of the negative electrode coating machine cannot be adjusted in real time according to the external environment, avoids the subjectivity and lag of manual adjustment, improves the energy utilization efficiency of the coating machine, reduces production costs, enhances the environmental adaptability and stability of the coating machine, and provides a strong guarantee for the continuous and stable production of lithium-ion batteries.

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

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

[0028] (1) The coating process of the negative electrode coater using the air volume adjustment method in the prior art takes one hour (including the test time) to complete the first piece. 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 the time to 45 minutes, and the production efficiency is improved by 25%.

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

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

[0031] like Figure 3 As shown, when obtaining the total volume V of the H2O working condition, the air volume adjustment method of the negative electrode coating machine of the secondary battery includes: obtaining the H2O standard volume V1, 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 of the total volume V of the H2O working condition is V=V1×(T0+T1) / T0, the unit of the H2O standard volume V1 is Nm³ / h, the unit of the temperature constant T0 is ℃, and the unit of the temperature T1 in the oven 1 is ℃. In this way, by using the ideal gas state equation and considering the influence of temperature on the gas volume, the total volume of the H2O working condition is accurately controlled by calculating the standard volume and the volume at the actual temperature in the oven, thereby improving the adaptability of the negative electrode coating machine to changes in ambient temperature and ensuring the adaptability of the air volume of the negative electrode coating machine to changes in temperature.

[0032] like Figure 3As shown, when obtaining the standard volume V1 of H2O, the air volume adjustment method of the negative electrode coating machine 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 of 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. In this way, 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, thereby providing accurate data support for the subsequent air volume calculation, ensuring the accuracy of the air volume calculation, and realizing the refined management of the coating process.

[0033] like Figure 3 As shown, when obtaining the hourly mass G of the solvent, the air volume adjustment method of the negative electrode coating machine of the secondary battery includes: obtaining the flow rate Q and solid content E of the single-sided slurry to calculate the hourly mass G of the solvent; wherein, the calculation formula of 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. In this way, based on the principle of material balance, the flow rate Q and solid content E of the single-sided slurry are calculated to obtain the hourly mass G of the solvent, which provides basic data for the subsequent calculation of the air volume of the negative electrode coating machine. The implementation effect is to improve the adaptability of the coating machine to changes in the slurry composition and ensure the control of the solvent during the coating process. The application scenario is that in the production process of the coating machine, especially in the link where the slurry composition needs to be adjusted, the hourly mass of the solvent can be automatically calculated to achieve dynamic control of the air volume of the negative electrode coating machine, thereby improving production flexibility and product consistency.

[0034] like Figure 3 As shown, when obtaining the flow rate Q of the single-sided slurry, the air volume adjustment method of the negative electrode coating machine of the secondary battery includes: obtaining the coating speed v, the coating width H and the dry surface density ρ to calculate the flow rate Q of the single-sided slurry; wherein, the calculation formula of 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 surface density ρ is g / ㎡. In this way, based on the working principle of the coating machine, by obtaining the coating speed v, the coating width H and the dry surface density ρ, the flow rate Q of the single-sided slurry is obtained, which provides data support for the subsequent calculation of the hourly mass G of the solvent, improves the adaptability of the coating machine to changes in production parameters, ensures the slurry control during the coating process, realizes the precise control of the air volume of the negative electrode coating machine, and improves production efficiency and product quality.

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

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

[0037] Preferably, the negative electrode coater comprises a two-layer oven 1 .

[0038] This application Figure 3 The specific meanings of the parameter names are as follows:

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

[0040] The coating width H should match the winding or lamination process used in the subsequent process. It is usually measured in millimeters (mm). The coating width H is a fixed indicator. The selection of coating width needs to be determined based on the specifications, design, accuracy and stability of battery production equipment, battery production process requirements, coating uniformity, slurry characteristics and other factors.

[0041] Dry 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 surface density ρ is a fixed indicator. The dry surface density is an important parameter in battery manufacturing, which directly affects the performance and energy density of the battery. The dry surface density needs to be determined based on material properties, process parameters, equipment factors, and drying process.

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

[0043] The solvent type is usually water;

[0044] The solvent molecular weight M refers to the mass of the solvent molecule, usually in grams per mole (g / mol). The solvent molecular weight M is a constant. In battery manufacturing, the size of the solvent molecular weight affects 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 to represent 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℃;

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

[0048] The solvent control content (volume ratio) B refers to the ratio of the volume of the solvent to 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 single-sided slurry refers to the volume of 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 single-sided slurry is an automatically calculated value;

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

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

[0052] The oven temperature T1 refers to the actual temperature in the oven. The oven temperature T1 is a fixed indicator and is a manually preset value. It needs to be determined based on slurry characteristics, process parameters, equipment performance, material characteristics, environmental factors, and quality control requirements;

[0053] The ambient temperature outside the oven T2 is the real-time monitored temperature, which is set at 30°C here;

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

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

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

[0057] Among them, fixed indicators refer to preset indicators used for standardized evaluation. They do not refer to completely fixed values ​​at all times, but values ​​that do not change during a continuous production process; constants refer to parameters that remain unchanged, and automatically calculated values ​​refer to values ​​generated by dynamic calculation based on inputs or conditions.

[0058] When calculating the air volume of the negative electrode coater in the air volume regulation system of the negative electrode coater based on secondary batteries, we can demonstrate the calculation process through the following multiple specific embodiments to illustrate how the air volume regulation 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: solvent type is H2O (i.e. water), coating speed v=80m / min, coating width H=1000mm, dry surface density ρ=110g / ㎡, solid content (mass ratio) E=53.0%, humidity difference between the first humidity and the second humidity=5.00%, solvent molecular weight M=18g / mol, temperature constant T0=273.15℃, safety factor K=100%, oven 1 internal temperature T1=120℃, oven 1 external ambient temperature T2=30℃;

[0061] The calculation process is as follows:

[0062] Volume fraction φ = 5.00%;

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

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

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

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

[0067] Total volume of H2O working condition V = V1 × (T0 + T1) / T0 = 582.68 × (273.15 + 120) / 273.15 = 838.7 m³ / h;

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

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

[0070] Embodiment 2:

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

[0072] The calculation process is as follows:

[0073] Volume fraction φ = 1.50%;

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

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

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

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

[0078] Total volume of H2O working condition V = V1 × (T0 + T1) / T0 = 582.68 × (273.15 + 120) / 273.15 = 838.7 m³ / h;

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

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

[0081] Embodiment three:

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

[0083] The calculation process is as follows:

[0084] Volume fraction φ = 0.50%;

[0085] Solvent control content (volume ratio) B = φ × K = 1.50% × 100% = 0.50%;

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

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

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

[0089] Total volume of H2O working condition V = V1 × (T0 + T1) / T0 = 582.68 × (273.15 + 120) / 273.15 = 838.7 m³ / h;

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

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

[0092] Embodiment 4:

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

[0094] The calculation process is as follows:

[0095] Volume fraction φ = 1.50%;

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

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

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

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

[0100] Total volume of H2O working condition V = V1 × (T0 + T1) / T0 = 582.68 × (273.15 + 130) / 273.15 = 860.0 m³ / h;

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

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

[0103] Embodiment five:

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

[0105] The calculation process is as follows:

[0106] Volume fraction φ = 1.50%;

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

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

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

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

[0111] Total volume of H2O working condition V = V1 × (T0 + T1) / T0 = 364.18 × (273.15 + 120) / 273.15 = 524.2 m³ / h;

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

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

[0114] Embodiment six:

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

[0116] The calculation process is as follows:

[0117] Volume fraction φ = 1.50%;

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

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

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

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

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

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

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

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

[0126] like Figure 1As shown, the present invention also provides an air volume regulating system for a negative electrode coating machine of a secondary battery, which is applicable to the above-mentioned air volume regulating method for a negative electrode coating machine of a secondary battery. The air volume regulating system for a negative electrode coating machine of a secondary battery comprises: an oven 1; an exhaust fan 2, the inlet of the exhaust fan 2 is connected to the air outlet of the oven 1; an air inlet fan 3, the outlet of the air inlet fan 3 is connected to the air inlet of the oven 1; a heat exchanger 4, the heat exchanger 4 comprises 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 connected to the external environment; the inlet of the air inlet fan 3 is connected to the first end of the second pipeline, and the second end of the second pipeline is connected to the external environment The first detection component 5 is arranged at the second end of the first pipeline, and is used to detect the first humidity of the exhaust air discharged by the exhaust fan 2 to the external environment; the second detection component 6 is arranged at the second end of the second pipeline, and is used to detect the second humidity of the fresh air sucked from the external environment by the air inlet fan 3; the industrial computer 7, the industrial computer 7 is connected to both the first detection component 5 and the second detection component 6, and is used to receive the first humidity and the second humidity, so as to calculate the total amount A of the exhaust air discharged by the exhaust fan 2 to the external environment according to the humidity difference between the first humidity and the second humidity, so as to adjust the air volume of the fresh air sucked from the external environment by the air inlet fan according to the total amount A of the exhaust air.

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

[0128] Specifically, the exhaust volume of the exhaust fan 2 is less than the intake volume of the intake fan 3, so as to ensure that the exhaust fan 2 can exhaust sufficient air volume; the heat exchanger 4 is an air-to-air heat exchanger, which is a device used to transfer heat between gases at different temperatures. It realizes heat transfer from high-temperature gas to low-temperature gas through heat conduction, convection and radiation, so as to achieve energy saving and improve 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] like Figure 1As shown, the air volume regulating system of the negative electrode coating machine of the secondary battery also includes: an exhaust pipe 8, the first end of the exhaust pipe 8 is connected to the second end of the first pipeline, and the second end of the exhaust pipe 8 extends to the external environment; an air inlet pipe 9, the first end of the air inlet pipe 9 is connected to the second end of the second pipeline, and the second end of the air inlet pipe 9 extends to the external environment. In this way, through the reasonable arrangement of the exhaust pipe 8 and the air inlet pipe 9, the air volume can be adjusted quickly and efficiently, the air volume regulating efficiency of the negative electrode coating machine is improved, the energy loss of the negative electrode coating machine in the air volume regulating process is reduced, the production cost is reduced, the production efficiency and product quality are improved, and it is easy to maintain and manage.

[0130] like Figure 1 As shown, the air volume regulating system of the negative electrode coating machine of the secondary battery also includes a primary filter 10, and the primary filter 10 is arranged on the air inlet pipe 9. The second detection component 6 is arranged on the air inlet pipe 9 and is located on the side of the primary filter 10 away from the heat exchanger 4, so as to perform preliminary filtering on the fresh air to be introduced into the negative electrode coating machine, remove large particles of impurities, and ensure the cleanliness of the fresh air, thereby improving the cleanliness and drying efficiency of the negative electrode coating machine during the coating process, reducing the risk of electrode contamination, and improving the consistency and yield of the product.

[0131] like Figure 1 As shown, the air volume regulating system of the negative electrode coating machine of the secondary battery also includes a medium efficiency filter 11, and the medium efficiency filter 11 is arranged on the connecting pipeline between the inlet of the air inlet fan 3 and the first end of the second pipeline, so as to further filter the fresh air after passing through the primary filter, remove tiny particle impurities, and ensure the high cleanliness of the fresh air, thereby improving the drying efficiency and product quality of the negative electrode coating machine during the coating process, improving the filtering effect of the coating machine on the fresh air, ensuring the cleanliness of the coating process, reducing the risk of pole piece contamination, improving the consistency and yield of the product, ensuring the cleanliness of the coating process, improving production efficiency and product quality, realizing precise control of the coating process, reducing production costs, 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 coating machine of the secondary battery of the present invention is as follows:

[0133] The fresh air in the external environment passes through the primary filter 10 under the drive of the air inlet fan 3, enters the second pipeline of the heat exchanger 4 after coming out of the primary filter 10, then passes through the medium filter 11 after coming out of the second pipeline of the heat exchanger 4, and then enters the corresponding oven 1 of the negative electrode coating machine after coming out of the medium filter 11, participates in the baking of the electrode, and carries water vapor, and enters the first pipeline of the heat exchanger 4 under the drive of the exhaust fan 2, and exchanges heat with the fresh air in the second pipeline of the heat exchanger 4 in the first pipeline of the heat exchanger 4, and finally is discharged to the external environment. Among them, the fresh air and the exhaust air are respectively fed back to the industrial computer 7 after the humidity is detected by the first detection component 5 and the second detection component 6. The industrial computer 7 will calculate the humidity difference between them according to the current first humidity and the second humidity, and then calculate the air volume according to the humidity difference, and finally adjust the total air volume of the negative electrode coating machine; according to the total amount of exhaust air A, the air volume of the fresh air drawn by the air inlet fan from the external environment is adjusted.

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

[0135] The air volume regulating method of the negative electrode coater of a secondary battery of the present invention comprises: obtaining a first humidity of exhaust air discharged to the external environment by an exhaust fan 2 connected to an oven 1 of a first layer of the negative electrode coater in an air volume regulating system of the negative electrode coater of the secondary battery and a second humidity of fresh air drawn from the external environment by an air intake fan 3 connected to an oven 1 of a first layer of the negative electrode coater in an 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, wherein 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, wherein B=φ×K; obtaining a total volume V of H2O working condition, wherein the unit of the total volume V of H2O working condition is m³ / h, and calculating a total amount A of exhaust air discharged to the external environment by the exhaust fan 2 according to the total volume V of H2O working condition and the solvent control content B; wherein A=V / B, and the unit of the total amount A of exhaust air is m³ / h. In this way, the air volume regulation method of the negative electrode coating machine of the secondary battery of the present invention monitors the humidity of the fresh air and the exhaust air in real time, and accurately calculates the humidity difference between the fresh air and the exhaust air. Combined with the safety factor and the total volume of H2O working conditions, it can realize the accurate calculation and regulation of the total amount of exhaust air discharged from the exhaust fan 2 to the external environment, and finally realizes the automation of the air volume regulation of the negative electrode coating machine of the secondary battery, significantly improves the control accuracy of the electrode dryness and wetness during the coating process, thereby ensuring the consistency of product quality, and solves the problem in the prior art that the air volume of the negative electrode coating machine cannot be adjusted in real time according to the external environment, avoids the subjectivity and lag of manual adjustment, improves the energy utilization efficiency of the coating machine, reduces production costs, enhances the environmental adaptability and stability of the coating machine, and provides 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 "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0137] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0138] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0139] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[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 distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0141] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for adjusting the air volume of a negative electrode coating machine for a secondary battery, characterized in that: include: Obtaining a first humidity of exhaust air discharged to the external environment by an exhaust fan (2) connected to a first-layer oven (1) of the negative electrode coating machine in an air volume control system of the negative electrode coating machine for a secondary battery, and a second humidity of fresh air drawn from the external environment by an air intake fan (3) connected to the first-layer oven (1) of the negative electrode coating machine in an air volume control system of the negative electrode coating machine for a secondary battery; Calculating a humidity difference between the first humidity and the second humidity to obtain a volume fraction φ, wherein the volume fraction φ is equal to the humidity difference; Obtaining a safety factor K, and calculating a controlled solvent content B according to the volume fraction φ and the safety factor K, wherein B=φ×K; Obtaining a total volume V of H2O under working conditions, wherein the unit of the total volume V of H2O under working conditions is m³ / h, and calculating a total amount A of exhaust air discharged from the exhaust fan (2) to the external environment according to the total volume V of H2O under working conditions and the controlled content B of the solvent; wherein A=V / B, and the unit of the total amount A of exhaust air is m³ / h; The volume of fresh air drawn from the external environment by the air inlet fan (3) is adjusted according to the total amount A of the exhaust air.

2. The method for adjusting the air volume of a negative electrode coating machine for a secondary battery according to claim 1, characterized in that: When the total volume V of the H2O working condition is obtained, the air volume adjustment method of the negative electrode coating machine of the secondary battery includes: Obtaining the H2O standard volume V1, the temperature constant T0 and the temperature T1 in the oven (1) to calculate the total volume V of the H2O working condition; The calculation formula of the total volume V of H2O under working condition is V=V1×(T0+T1) / T0, the unit of the H2O standard volume V1 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.

3. The method for adjusting the air volume of a negative electrode coating machine for a secondary battery according to claim 2, characterized in that: When obtaining the H2O standard volume V1, the air volume adjustment method of the negative electrode coating machine of the secondary battery includes: Obtain the solvent hourly mass G and the solvent molecular weight M to calculate the H2O standard volume V1; The calculation formula of 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.

4. The method for adjusting the air volume of a negative electrode coating machine for a secondary battery according to claim 3, characterized in that: When obtaining the hourly mass G of the solvent, the air volume adjustment method of the negative electrode coating machine of the secondary battery includes: Obtain the flow rate Q and solid content E of the single-sided slurry to calculate the hourly mass G of the solvent; The calculation formula of 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.

5. The method for adjusting the air volume of a negative electrode coating machine for a secondary battery according to claim 4, characterized in that: When obtaining the flow rate Q of the single-sided slurry, the air volume adjustment method of the negative electrode coating machine of the secondary battery includes: Obtaining the coating speed v, coating width H and dry pattern surface density ρ to calculate the flow rate Q of the single-sided slurry; Among them, 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 surface density ρ is g / ㎡.

6. The method for adjusting the air volume of a negative electrode coating machine for a secondary battery according to claim 1, characterized in that: The method for adjusting the air volume of the negative electrode coating machine of the secondary battery comprises: Obtaining the number of layers N of the oven (1) in the negative electrode coating machine to calculate the total exhaust volume Z of the negative electrode coating machine; Among them, the calculation formula of the total exhaust volume Z of the negative electrode coater is Z=A×N, and the unit of the total exhaust volume Z of the negative electrode coater is m³ / h.

7. An air volume regulating system for a negative electrode coating machine of a secondary battery, characterized in that: The method for regulating the air volume of a negative electrode coating machine of a secondary battery according to any one of claims 1 to 6, wherein the air volume regulating system of the negative electrode coating machine of the secondary battery comprises: Oven (1); An exhaust fan (2), the inlet of the exhaust fan (2) being connected to the air outlet of the oven (1); An air inlet fan (3), the outlet of the air inlet fan (3) being connected to the air inlet of the oven (1); A heat exchanger (4), the heat exchanger (4) comprising a first pipeline and a second pipeline capable of exchanging heat with each other, the outlet of the exhaust fan (2) being connected to the first end of the first pipeline, the second end of the first pipeline being in communication with the external environment; the inlet of the air inlet fan (3) being connected to the first end of the second pipeline, the second end of the second pipeline being in communication with the external environment; A first detection component (5) is arranged at the second end of the first pipeline, and is used to detect a first humidity of exhaust air discharged from the exhaust fan (2) to the external environment; A second detection component (6) is arranged at a second end of the second pipeline, and is used to detect a second humidity of the fresh air sucked from the external environment by the air inlet fan (3); An industrial computer (7), the industrial computer (7) being connected to both the first detection component (5) and the second detection component (6) for receiving the first humidity and the second humidity, so as to calculate the total amount A of 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, so as to adjust the amount of fresh air drawn from the external environment by the air intake fan (3) according to the total amount A of exhaust air.

8. The air volume regulating system for the negative electrode coating machine of the secondary battery according to claim 7, characterized in that: The air volume regulating system of the negative electrode coating machine of the secondary battery also includes: an exhaust pipe (8), the first end of the exhaust pipe (8) being connected to the second end of the first pipeline, and the second end of the exhaust pipe (8) extending to the external environment; An air inlet pipe (9), wherein a first end of the air inlet pipe (9) is connected to a second end of the second pipeline, and the second end of the air inlet pipe (9) extends to the external environment.

9. The air volume regulating system for a negative electrode coating machine of a secondary battery according to claim 8, characterized in that: The air volume regulating system of the negative electrode coating machine for a secondary battery further comprises a primary filter (10), wherein the primary filter (10) is arranged on the air inlet pipe (9), and the second detection component (6) is arranged on the air inlet pipe (9) and is located on a side of the primary filter (10) away from the heat exchanger (4).

10. The air volume adjustment system for a negative electrode coating machine of a secondary battery according to claim 8 or 9, characterized in that: The air volume regulating system for the negative electrode coating machine of a secondary battery further comprises a medium efficiency filter (11), wherein the medium efficiency filter (11) is arranged on the connecting pipeline between the inlet of the air inlet fan (3) and the first end of the second pipeline.

Images