Drying apparatus, coating machine, and drying method

Abstract

Disclosed herein are a drying apparatus, a coating machine, and a drying method. The drying apparatus comprises a fresh air main pipe, an exhaust main pipe, an NMP recovery system, and at least two drying ovens. Each drying oven is provided with a drying region, and electrode sheets are dried as they pass through each drying oven. Each drying oven is equipped with a pressure detection apparatus, which is used to detect an air pressure value inside the drying oven as a partial air pressure value. A fresh air inlet of each drying oven is connected to the fresh air main pipe by means of a pipeline, the fresh air main pipe is equipped with a main fresh air fan, and a fresh air valve is disposed at the fresh air inlet of each drying oven. An exhaust outlet of each drying oven is connected to the exhaust main pipe by means of a pipeline, the exhaust main pipe is equipped with a main exhaust fan, and an exhaust valve is disposed at the exhaust outlet of each drying oven. The NMP recovery system is used to recover N-methylpyrrolidone, the fresh air main pipe is connected to an outlet of the NMP recovery system, and the exhaust main pipe is connected to an inlet of the NMP recovery system.

Description

Drying device, coating machine and drying method

[0001] Cross-reference to related applications

[0002] The present disclosure is based on and claims priority to Chinese Patent Application No. 202411044533.X, filed on July 31, 2024, entitled “Drying device, coating machine and drying method”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present disclosure relates to the technical field of battery manufacturing, and in particular to a drying device, a coating machine and a drying method. BACKGROUND

[0004] New energy batteries are increasingly widely used in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are increasingly used in the field of energy storage and the like. In new energy vehicles equipped with batteries, the batteries can be used to provide all or part of the power. In the field of energy storage, batteries can be installed in energy storage boxes or directly installed on the user side.

[0005] The quality of the electrode tab in the battery is related to the capacity, energy density, cycle life and other performances of the battery. Therefore, how to improve the manufacturing quality of the electrode tab is one of the topics that the industry needs to study. SUMMARY

[0006] To solve the above technical problems, the present disclosure provides a drying device, a coating machine and a drying method capable of improving the quality of the electrode tab.

[0007] The present disclosure is achieved by the following technical solutions.

[0008] The present disclosure provides a drying device, comprising: at least two communicating ovens, the ovens are provided with drying areas, the pole pieces are dried during the process of passing through each oven, each oven is provided with an air pressure detection device, the air pressure detection device is used to detect the air pressure value in the oven as a partial air pressure value, each oven is provided with a fresh air inlet for fresh air and an exhaust outlet for exhaust gas in the oven; a fresh air main pipe, the fresh air inlets of each oven are connected to the fresh air main pipe through pipelines respectively, the fresh air main pipe is provided with a total fresh air fan, and each fresh air inlet of the oven is provided with a fresh air damper; an exhaust main pipe, the exhaust outlets of each oven are connected to the exhaust main pipe through pipelines respectively, the exhaust main pipe is provided with a total exhaust fan, and each exhaust outlet of the oven is provided with an exhaust damper; an NMP recovery system for recovering N-methyl pyrrolidone generated during the drying process of the pole pieces in the drying area of each oven, the fresh air main pipe is connected to the outlet of the NMP recovery system, the exhaust main pipe is connected to the inlet of the NMP recovery system, the oven with a partial air pressure value not in the preset partial negative pressure value interval is regarded as a to-be-adjusted air pressure oven, and in the case that there is at least one to-be-adjusted air pressure oven, the output power of the total fresh air fan and the total exhaust fan and the opening degree of the fresh air damper and the exhaust damper of the to-be-adjusted air pressure oven are adjusted, so that the partial air pressure value of the to-be-adjusted air pressure oven is in the preset partial negative pressure value interval.

[0009] In the case that the partial air pressure value of at least one oven is not in the preset partial negative pressure value interval, the output power of the total fresh air fan and the total exhaust fan can be adjusted to change the partial air pressure values of multiple ovens at the same time, and the adjustment efficiency is high. In addition, by adjusting the opening degree of the fresh air damper and the exhaust damper of the to-be-adjusted air pressure oven, the amount of fresh air entering the to-be-adjusted air pressure oven and the amount of exhaust gas after the drying operation can be changed. The output power of the frequency converter of the total fresh air fan and the total exhaust fan is connected to the opening degree of the fresh air damper and the exhaust damper in the present disclosure, and by cooperating adjustment, the partial air pressure value of the to-be-adjusted air pressure oven is in the preset partial negative pressure value interval, so that the partial air pressure values of each oven quickly reach the condition that they are all in the preset partial negative pressure value interval. Therefore, the present disclosure improves the uniformity of the drying effect and improves the quality of the electrode pole piece, and the adjustment efficiency is high.

[0010] In some embodiments, each oven is provided with a fresh air inlet for fresh air to enter and an exhaust air outlet for air in the oven to be discharged, and each oven is provided with an NMP concentration measuring device at the exhaust air outlet, which is used to detect the partial NMP concentration value of the air passing through the exhaust air outlet. Each oven is provided with a circulating fan, which is used to drive the circulating air flowing back from the drying area and the air after the convergence of the fresh air from the fresh air inlet to flow towards the drying area. The oven with a partial NMP concentration value not in the preset partial NMP concentration value interval is regarded as a concentration adjustment oven. In the case where there is at least one concentration adjustment oven, the output power of the circulating fan and the opening degree of the fresh air damper and the exhaust air damper of the concentration adjustment oven are adjusted so that the partial NMP concentration value of the concentration adjustment oven is in the preset partial NMP concentration value interval.

[0011] In the case where the partial NMP concentration value of at least one oven is not in the preset partial NMP concentration value interval, the partial NMP concentration value can be changed by adjusting the output power of the circulating fan, and the amount of fresh air entering the concentration adjustment oven and the amount of air discharged after the drying operation can be changed by adjusting the opening degree of the fresh air damper and the exhaust air damper of the concentration adjustment oven, and the partial NMP concentration value can also be changed. The output power of the circulating fan is linked to the opening degree of the fresh air damper and the exhaust air damper in the embodiments of the present disclosure, and the partial NMP concentration value of the concentration adjustment oven is in the preset partial NMP concentration value interval by coordinated adjustment, so that the partial NMP concentration values of all ovens are quickly in the condition of being in the preset partial NMP concentration value interval. Therefore, the embodiments of the present disclosure improve the uniformity of the drying effect and improve the quality of the electrode sheet, and the adjustment efficiency is high.

[0012] In some embodiments, each oven is provided with a wind box inlet speed measuring device, which is used to detect the wind speed value of the air after the convergence of the circulating air and the fresh air. In the case where the wind speed value measured by the wind box inlet speed measuring device is not in the preset wind speed value interval, the circulating fan is adjusted so that the wind speed value measured by the wind box inlet speed measuring device is in the preset wind speed value interval.

[0013] The wind box inlet speed measuring device is used to detect the wind speed value of the air after the convergence of the circulating air and the fresh air, and the circulating air and the fresh air immediately blow towards the drying area after convergence. Therefore, by making the wind speed value measured by the wind box inlet speed measuring device in the preset wind speed value interval, the wind speed of the air sent to the drying area is appropriate, thereby improving the uniformity of the wind speed blowing towards the electrode sheet and improving the quality of the electrode sheet.

[0014] In some embodiments, each oven is provided with a fresh air fan and a fresh air speed detection device at the fresh air port, the fresh air fan being capable of adjusting the air speed of the fresh air port, and the fresh air speed detection device detecting the air speed of the fresh air port; each oven is provided with an exhaust fan and an exhaust speed detection device at the exhaust port, the exhaust fan being capable of adjusting the air speed of the exhaust port, and the exhaust speed detection device detecting the air speed of the exhaust port, in the case of at least one oven to be adjusted for air pressure, the output power of the total fresh air fan and the total exhaust fan, the opening degree of the fresh air damper and the exhaust damper of the oven to be adjusted for air pressure, and the output power of the fresh air fan and the exhaust fan are adjusted, so that the partial air pressure value of the oven to be adjusted for air pressure is in the preset partial negative pressure value interval, and in the case of at least one oven to be adjusted for concentration, the output power of the circulating fan of the oven to be adjusted for concentration, the opening degree of the fresh air damper and the exhaust damper, and the output power of the fresh air fan and the exhaust fan are adjusted, so that the partial NMP concentration value of the oven to be adjusted for concentration is in the preset partial NMP concentration value interval.

[0015] In this way, the partial air pressure value of each oven is in the preset partial negative pressure value interval, and the partial NMP concentration value of each oven is in the preset partial NMP concentration value interval, thereby improving the uniformity of the drying effect and improving the quality of the electrode sheet. Moreover, the adjustment efficiency is high.

[0016] In some embodiments, each oven is provided with a heat exchange device, which is used to heat the temperature of the gas after the circulating air and fresh air are converged, and in the case of at least one oven to be adjusted for concentration, the heating temperature of the heat exchange device of the oven to be adjusted for concentration is adjusted, so that the partial NMP concentration value of the oven to be adjusted for concentration is in the preset partial NMP concentration value interval.

[0017] The heat exchange device is used to heat the temperature of the gas after the circulating air and fresh air are converged, thereby increasing the temperature of the gas blown to the drying area, thereby achieving the drying of the electrode sheet. The higher the drying temperature of the electrode sheet, the faster the NMP is generated, which will make the partial NMP concentration value higher. Therefore, by changing the heating temperature of the heat exchange device, the partial NMP concentration value can be affected, so that the partial NMP concentration value is in the preset partial NMP concentration value interval.

[0018] In some embodiments, in the case of at least one oven to be adjusted for concentration, the output power of the total fresh air fan and / or the total exhaust fan is adjusted, so that the partial NMP concentration value of the oven to be adjusted for concentration is in the preset partial NMP concentration value interval.

[0019] In this way, on the basis of adjusting the circulating fan, the fresh air damper, the exhaust damper, the fresh air fan, the exhaust fan, and the heat exchange device, the output power of the total fresh air fan and / or the total exhaust fan is also adjusted, which can accelerate the rate of adjusting the partial NMP concentration value.

[0020] In some embodiments, the exhaust air main pipe is provided with a total exhaust air NMP concentration measuring device for detecting the total NMP concentration value of the gas passing through the exhaust air main pipe. In the case where there is at least one concentration-adjusted oven and the total NMP concentration value is not in the preset total NMP concentration value range, the output power of the circulating fan of the concentration-adjusted oven and the heating temperature of the heat exchange device are first adjusted so that the total NMP concentration value is in the preset total NMP concentration value range. Then, the output power of the fresh air fan and the exhaust air fan of the concentration-adjusted oven, the opening of the fresh air damper and the exhaust air damper, and the heating temperature of the heat exchange device are adjusted so that the partial NMP concentration value of the concentration-adjusted oven is in the preset partial NMP concentration value range.

[0021] In this way, the total NMP concentration value is first adjusted to be in the preset total NMP concentration value range, which can simultaneously adjust multiple concentration-adjusted ovens, thereby improving the adjustment efficiency. Then, the partial NMP concentration value of the concentration-adjusted oven is adjusted to be in the preset partial NMP concentration value range, so that the partial NMP concentration value of each oven is in the preset partial NMP concentration value range. First, coarse adjustment is performed, and then fine adjustment is performed. This not only improves the adjustment efficiency, but also improves the adjustment accuracy, thereby further improving the quality of the electrode sheet.

[0022] In some embodiments, the exhaust air main pipe is provided with a total pressure detecting device for detecting the total air pressure value in the exhaust air main pipe. In the case where there is at least one pressure-adjusted oven and the total air pressure value is not in the preset total negative pressure value range, the output power of the total fresh air fan and the total exhaust air fan is first adjusted so that the total air pressure value is in the preset total negative pressure value range. Then, the output power of the fresh air fan and the exhaust air fan of the pressure-adjusted oven, and the opening of the fresh air damper and the exhaust air damper are adjusted so that the partial air pressure value is in the preset partial negative pressure value range.

[0023] In this way, the total air pressure value is first adjusted to be in the preset total negative pressure value range, which can simultaneously affect the partial air pressure values of multiple pressure-adjusted ovens, thereby improving the adjustment efficiency. Then, the partial air pressure value of the pressure-adjusted oven is adjusted to be in the preset partial air pressure value range, so that the partial air pressure value of each oven is in the preset partial negative pressure value range. First, coarse adjustment is performed, and then fine adjustment is performed. This not only improves the adjustment efficiency, but also improves the adjustment accuracy, thereby further improving the quality of the electrode sheet.

[0024] In some embodiments, the fresh air main pipe is provided with a total fresh air speed measuring device for detecting the air speed in the fresh air main pipe during adjustment of the total fresh air fan. The exhaust air main pipe is provided with a total exhaust air speed measuring device for detecting the air speed in the exhaust air main pipe during adjustment of the total exhaust air fan.

[0025] Therefore, the accuracy of the air speed adjustment of the fresh air main pipe and the exhaust air main pipe can be improved, so that the accuracy of the air pressure adjustment and the NMP concentration adjustment is improved, the uniformity of the drying effect is improved, the quality of the electrode plate is improved, and the adjustment efficiency is high.

[0026] In some embodiments, each oven comprises an oven body and a first air box and a second air box arranged in the oven body, the first air box and the second air box are oppositely arranged and define a drying area therebetween, the first air box is provided with a first air inlet for air to enter, the second air box is provided with a second air inlet for air to enter, the first air box has a first box wall facing the second air box, the first box wall is provided with a plurality of first air nozzles with outlets facing the drying area, the first air nozzles are used for air in the first air box to be discharged towards the electrode plate; the box wall of the second air box facing the first air box is provided with a plurality of second air nozzles with outlets facing the drying area, the second air nozzles are used for air in the second air box to be discharged towards the electrode plate, the oven body is provided with a fresh air inlet and an exhaust air outlet, the fresh air inlet is communicated with the first air inlet of the first air box and the second air inlet of the second air box, and the exhaust air outlet is communicated with the drying area.

[0027] In some embodiments, a return air passage is arranged in the oven body, a circulating fan is arranged in the return air passage, the fresh air inlet and the exhaust air outlet are respectively communicated with the return air passage, the circulating fan is used to drive the air in the drying area to flow through the return air passage and the exhaust air outlet, so that part of the air is discharged through the exhaust air outlet, and the remaining air in the return air passage and the fresh air supplemented from the fresh air inlet enter the first air inlet and the second air inlet through the return air passage, and a heat exchange device and an air box air inlet speed measuring device are arranged in the passage of the return air passage between the fresh air inlet and the first air inlet and the second air inlet.

[0028] In this way, part of the air in the drying area can re-enter the first air box and the second air box through the return air passage, and then blow towards the electrode plate, so that the air is recycled, the recycled air has higher heat, and the heat loss is reduced, so that the heat utilization rate is improved.

[0029] In some embodiments, a first air inlet damper is arranged at the first air inlet of the first air box, and a second air inlet damper is arranged at the second air inlet of the second air box, and the opening degree of the first air inlet damper and / or the second air inlet damper is adjusted in the process of adjusting the output power of the circulating fan.

[0030] In some embodiments, the first box wall is provided with a return air nozzle for the air in the drying area to flow back to the return air passage.

[0031] The gas in the drying area can enter the return air channel through the return air nozzle arranged on the first tank wall. In this way, the flow path of the gas is shortened, the resistance and wind speed fluctuation in the circulation process are reduced, the uniformity of the transverse air volume is improved, the balanced drying of the "surface layer" of the pole piece coating is achieved, the uniform drying of the inner and outer layers of the thick coating is achieved, the transverse cracking and edge over-drying are improved, and thus the quality of the electrode pole piece is improved.

[0032] In some embodiments, the outer side of the first tank wall of the first air box is provided with a visual detection device for detecting the appearance of the pole piece in the drying area.

[0033] The visual detection device can adopt an AI visual detection device, which can monitor the appearance of the pole piece inside the drying area online. When the appearance of the pole piece is abnormal, the drying data can be corrected in time by controlling the air speed, negative pressure, or NMP concentration, thereby improving the coating and drying quality and efficiency.

[0034] In some embodiments, the visual detection device is connected to the outer side of the first tank wall through a mounting assembly, and the mounting assembly is configured to adjust the position of the visual detection device along the width direction of the pole piece.

[0035] In this way, the appearance of the pole piece can be detected in a larger range, and the coating and drying quality and efficiency can be further improved.

[0036] A second aspect of the present disclosure provides a coating machine, comprising:

[0037] a first coating head for coating a first surface of a substrate to form a pole piece;

[0038] a first drying device and a second drying device formed by the above drying device, the first drying device being arranged downstream of the first coating head and being used for drying the pole piece with the first surface facing upward;

[0039] a second coating head arranged downstream of the first drying device and used for coating a second surface of the pole piece;

[0040] a climbing mechanism arranged downstream of the second coating head and upstream of the second drying device, the climbing mechanism being used for supporting and pulling the pole piece from one side of the first surface of the pole piece, so that the pole piece enters the second drying device with the second surface facing upward, and the second drying device being used for drying the pole piece with the second surface facing upward.

[0041] The third aspect of the present disclosure provides a drying method using a drying device, the drying device comprising a fresh air main pipe, an exhaust air main pipe and at least two connected ovens, the ovens being provided with drying areas, the pole pieces being dried in the process of passing through each oven, each oven being provided with an air pressure detection device for detecting the air pressure value in the oven as a partial air pressure value, each oven being provided with a fresh air inlet for the fresh air to enter and an exhaust air outlet for the gas in the oven to be exhausted; the fresh air inlets of each oven are connected to the fresh air main pipe through pipelines, the fresh air main pipe is provided with a total fresh air fan, and the fresh air inlets of each oven are provided with fresh air dampers; the exhaust air outlets of each oven are connected to the exhaust air main pipe through pipelines, the exhaust air main pipe is provided with a total exhaust air fan, and the exhaust air outlets of each oven are provided with exhaust air dampers; an NMP recovery system is used to recover N-methyl pyrrolidone generated in the drying process of the pole pieces in the drying area of each oven, the fresh air main pipe is connected to the outlet of the NMP recovery system, and the exhaust air main pipe is connected to the inlet of the NMP recovery system;

[0042] The drying method comprises:

[0043] The air pressure adjustment step takes the oven whose partial air pressure value detected by the air pressure detection device is not in the preset partial negative pressure value interval as a to-be-adjusted air pressure oven, and in the case that there is at least one to-be-adjusted air pressure oven, adjusts the output power of the total fresh air fan and the total exhaust air fan and the opening degree of the fresh air damper and the exhaust air damper of the to-be-adjusted air pressure oven, so that the partial air pressure value of the to-be-adjusted air pressure oven is in the preset partial negative pressure value interval.

[0044] In some embodiments, a circulating fan is arranged in each oven, the circulating fan being used to drive the circulating air circulating back from the drying area and the gas after the confluence of the fresh air entering from the fresh air inlet to flow towards the drying area; a wind box inlet air speed detection device is arranged in each oven, the wind box inlet air speed detection device being used to detect the air speed value of the gas after the confluence of the circulating air and the fresh air;

[0045] The drying method further comprises, after the air pressure adjustment step:

[0046] The air speed adjustment step adjusts the circulating fan in the case that the air speed value detected by the wind box inlet air speed detection device is not in the preset air speed value interval, so that the air speed value detected by the wind box inlet air speed detection device is in the preset air speed value interval.

[0047] In some embodiments, an NMP concentration detection device is arranged at the exhaust air outlet of each oven, the NMP concentration detection device being used to detect the partial NMP concentration value passing through the exhaust air outlet;

[0048] The drying method further comprises, after the air speed adjustment step:

[0049] The concentration adjustment step includes: determining whether the partial NMP concentration value measured by the NMP concentration measuring device is within the preset partial NMP concentration value interval; and adjusting the output power of the circulating fan, the opening degree of the fresh air damper and the exhaust air damper of the oven, so that the partial NMP concentration value of the oven is within the preset partial NMP concentration value interval.

[0050] In some embodiments, a fresh air fan is arranged at the fresh air port of each oven, and the fresh air fan is used to adjust the air speed of the fresh air port; an exhaust air fan is arranged at the exhaust air port of each oven, and the exhaust air fan is used to adjust the air speed of the exhaust air port.

[0051] In the air pressure adjustment step, the output power of the fresh air fan and the exhaust air fan of the oven to be adjusted is also adjusted.

[0052] In the concentration adjustment step, the output power of the fresh air fan and the exhaust air fan of the oven to be adjusted is also adjusted.

[0053] In some embodiments, a heat exchange device is arranged in each oven, and the heat exchange device is used to heat the temperature of the gas after the circulating air and the fresh air are converged.

[0054] In the concentration adjustment step, the heating temperature of the heat exchange device of the oven to be adjusted is also adjusted.

[0055] In some embodiments, in the concentration adjustment step, the output power of the total fresh air fan and / or the total exhaust air fan is also adjusted.

[0056] In some embodiments, the exhaust air main pipe is provided with a total exhaust air NMP concentration measuring device, and the total exhaust air NMP concentration measuring device is used to detect the total NMP concentration value of the gas passing through the exhaust air main pipe.

[0057] The concentration adjustment step includes:

[0058] The total concentration adjustment step includes: in the case that there is at least one oven to be adjusted, and the total NMP concentration value is not within the preset total NMP concentration value interval, adjusting the output power of the circulating fan and the heating temperature of the heat exchange device of the oven to be adjusted, so that the total NMP concentration value is within the preset total NMP concentration value interval.

[0059] The partial concentration adjustment step includes: in the case that there is at least one oven to be adjusted, adjusting the output power of the fresh air fan and the exhaust air fan, the opening degree of the fresh air damper and the exhaust air damper, and the heating temperature of the heat exchange device of the oven to be adjusted, so that the partial NMP concentration value of the oven to be adjusted is within the preset partial NMP concentration value interval.

[0060] In some embodiments, the exhaust air main pipe is provided with a total pressure detection device, and the total pressure detection device is used to detect the total air pressure value in the exhaust air main pipe.

[0061] The air pressure adjusting step comprises:

[0062] The total air pressure adjusting step, in the presence of at least one air pressure oven to be adjusted, and the total air pressure value is not in the preset total negative pressure value interval, adjusts the output power of the total fresh air fan and the total exhaust fan, so that the total air pressure value is in the preset total negative pressure value interval.

[0063] The partial air pressure adjusting step adjusts the output power of the fresh air fan and the exhaust fan of the air pressure oven to be adjusted, and the opening degree of the fresh air damper and the exhaust damper, so that the partial air pressure value is in the preset partial negative pressure value interval.

[0064] In some embodiments, the drying area of each oven is provided with a visual detection device for detecting the appearance of the pole piece passing through the drying area;

[0065] The drying method further comprises:

[0066] The visual feedback step, in the case that the appearance detected by the visual detection device does not meet the preset appearance reference standard, carries out the air pressure adjusting step, and / or the air speed adjusting step, and / or the concentration adjusting step.

[0067] In some embodiments, the drying method further comprises:

[0068] In the case that the drying process of a batch of pole pieces is completed, the final drying parameters are obtained, including the final output power of the total fresh air fan and the total exhaust fan, and the final opening degree of the fresh air damper and the exhaust damper of the air pressure oven to be adjusted; in the case that the drying process of the next batch of pole pieces starts, the drying device carries out drying on the next batch of pole pieces according to the final drying parameters.

[0069] The beneficial effects of the embodiments of the present disclosure include: through the present disclosure, a drying device, a coating machine and a drying method capable of improving the quality of electrode pole pieces are provided, BRIEF DESCRIPTION OF DRAWINGS

[0070] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are intended to only illustrate preferred embodiments and are not considered limiting of the present disclosure. Moreover, throughout the drawings, like reference numerals are used to designate like parts. In the drawings:

[0071] FIG. 1 is a schematic diagram of the composition of a drying system provided by some embodiments of the present disclosure;

[0072] FIG. 2 is a control system diagram of a drying system provided by some embodiments of the present disclosure;

[0073] FIG. 3 is a control system diagram of a drying system provided by some embodiments of the present disclosure;

[0074] Figure 4 is a sectional view of the oven according to some embodiments of the present disclosure;

[0075] Figure 5 is a front view of the oven according to some embodiments of the present disclosure;

[0076] Figure 6 is a sectional view along A-A of Figure 5;

[0077] Figure 7 is a sectional view along B-B of Figure 5;

[0078] Figure 8 is a top view of the oven according to some embodiments of the present disclosure;

[0079] Figure 9 is a schematic view of a coating machine according to some embodiments of the present disclosure;

[0080] Figure 10 is a first flowchart of a drying method according to some embodiments of the present disclosure;

[0081] Figure 11 is a second flowchart of a drying method according to some embodiments of the present disclosure;

[0082] Figure 12 is a third flowchart of a drying method according to some embodiments of the present disclosure;

[0083] Figure 13 is a flowchart of a concentration adjustment step according to some embodiments of the present disclosure;

[0084] Figure 14 is a flowchart of a gas pressure adjustment step according to some embodiments of the present disclosure;

[0085] Figure 15 is a fourth flowchart of a drying method according to some embodiments of the present disclosure;

[0086] Figure 16 is a fifth flowchart of a drying method according to some embodiments of the present disclosure;

[0087] Figure 17 is a flowchart of a drying method according to some embodiments of the present disclosure;

[0088] Figure 18 is a first flowchart of a drying parameter adjustment method according to some embodiments of the present disclosure;

[0089] Figure 19 is a second flowchart of a drying parameter adjustment method according to some embodiments of the present disclosure;

[0090] Figure 20 is a first flowchart of a first parameter adjustment method according to some embodiments of the present disclosure;

[0091] Figure 21 is a flowchart of a first sub-parameter adjustment method according to some embodiments of the present disclosure;

[0092] Figure 22 is a flowchart of a second sub-parameter adjustment method according to some embodiments of the present disclosure;

[0093] FIG. 23 is a flowchart of a second parameter adjustment method according to some embodiments of the present disclosure;

[0094] FIG. 24 is a flowchart of a third parameter adjustment method according to some embodiments of the present disclosure;

[0095] FIG. 25 is a flowchart of a fourth parameter adjustment method according to some embodiments of the present disclosure;

[0096] FIG. 26 is a flowchart of a first parameter adjustment method according to some embodiments of the present disclosure;

[0097] FIG. 27 is a flowchart of a second parameter adjustment method according to some embodiments of the present disclosure;

[0098] FIG. 28 is a flowchart of a third parameter adjustment method according to some embodiments of the present disclosure;

[0099] FIG. 29 is a flowchart of a third parameter adjustment method according to some embodiments of the present disclosure;

[0100] FIG. 30 is a flowchart of a fourth parameter adjustment method according to some embodiments of the present disclosure;

[0101] FIG. 31 is a flowchart of an air intake adjustment method according to some embodiments of the present disclosure;

[0102] FIG. 32 is a flowchart of an air exhaust adjustment method according to some embodiments of the present disclosure;

[0103] FIG. 33 is a flowchart of a fourth parameter adjustment method according to some embodiments of the present disclosure;

[0104] FIG. 34 is a flowchart of a third parameter adjustment method according to some embodiments of the present disclosure;

[0105] FIG. 35 is a flowchart of a third parameter adjustment method according to some embodiments of the present disclosure;

[0106] FIG. 36 is a flowchart of a third parameter adjustment method according to some embodiments of the present disclosure;

[0107] FIG. 37 is a flowchart of a fourth parameter adjustment method according to some embodiments of the present disclosure;

[0108] FIG. 38 is a flowchart of a fourth parameter adjustment method according to some embodiments of the present disclosure;

[0109] FIG. 39 is a flowchart of a drying parameter adjustment method according to some embodiments of the present disclosure;

[0110] FIG. 40 is a flow diagram of a drying parameter adjustment method according to some embodiments of the present disclosure;

[0111] FIG. 41 is a flow diagram of a next electrode plate drying method according to some embodiments of the present disclosure;

[0112] FIG. 42 is a schematic diagram of a control panel of an oven according to some embodiments of the present disclosure.

[0113] BRIEF DESCRIPTION OF THE DRAWINGS 100 electrode plate; 1 drying equipment; 20 drying area; 2 control equipment; 3 drying device; 3a first drying device; 3b second drying device; 300 control panel; 31 oven; 310 first air inlet temperature measuring device; 311 oven body; 3111 fresh air inlet; 3112 exhaust air outlet; 3113 first oven shell; 3114 second oven shell; 3115 second return air pipe; 31150 second return air inlet; 3116 first return air pipe; 31160 first return air inlet; 3117 first air inlet pipe; 3118 second air inlet pipe; 312 first air bellow; 3121 first bellow wall; 3122 first air inlet; 313 air outlet speed measuring device; 314 first air nozzle; 315 heating device; 316 first air inlet valve; 317 first air inlet speed measuring device; 318 circulating air fan; 319 fresh air fan; 320 fresh air valve; 321 fresh air speed measuring device; 322 exhaust air fan; 323 exhaust air valve; 324 exhaust air speed measuring device; 325 NMP concentration measuring device; 326 air pressure detecting device; 327 visual detecting device; 328 second air bellow; 3291 second air nozzle; 3292 second air inlet; 3293 second air inlet valve; 3294 second air inlet speed measuring device; 330 return air temperature measuring device; 340 return air nozzle; 33 fresh air main pipe; 331 total fresh air fan; 332 total fresh air speed measuring device; 333 total fresh air NMP concentration measuring device; 34 exhaust air main pipe; 341 total exhaust air fan; 342 total exhaust air speed measuring device; 343 total exhaust air NMP concentration measuring device; 344 total pressure detecting device; 39 NMP recovery system; 350 heat exchange device; 351 heat conducting oil flow meter; 352 thermocouple; 353 filter; 360 connecting assembly; 370 air bellow air inlet speed measuring device; 41 unwinding unit; 42 passing roller assembly; 43 unwinding deviation correction; 44a first coating head; 44b second coating head; 45 first deviation correction unit; 46 first traction unit; 47 first surface density measuring system; 48 first traction deviation correction unit; 51 intelligent control closed loop system; 52 climbing mechanism; 53 second deviation correction unit; 54 second traction unit; 55 additional drying device; 56 cooling traction unit; 57 second surface density measuring system; 58 winding deviation correction unit; 59 winding unit. DETAILED DESCRIPTION

[0114] The embodiments of the technical solutions of the present disclosure will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present disclosure, and therefore only serve as examples, and cannot limit the protection scope of the present disclosure.

[0115] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure; the terms "comprising" and "having," and any variations thereof, as used herein are intended to cover a non-exclusive inclusion.

[0116] In the description of the embodiments of the present disclosure, the technical terms "first", "second", "third" and the like are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present disclosure, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0117] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present disclosure. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to each other. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0118] In the description of the embodiments of the present disclosure, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are "or" relationship.

[0119] In the description of the embodiments of the present disclosure, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the embodiments of the present disclosure and simplifying the description, and is not intended to indicate or imply that the indicated device or element must have a particular orientation, be constructed, operated or used in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present disclosure.

[0120] In the description of the embodiments of the present disclosure, unless explicitly defined and limited otherwise, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above-mentioned terms in the embodiments of the present disclosure can be understood according to the specific circumstances.

[0121] In the description of the embodiments of the present disclosure, unless explicitly defined and limited otherwise, the technical term "contact" should be understood in a broad sense, which can be direct contact or contact through an intermediate medium layer, which can be contact between two contacting objects without interaction force, or contact between two contacting objects with interaction force.

[0122] Next, the present disclosure will be described in detail.

[0123] At present, new energy batteries are more and more widely used in life and industry. New energy batteries are not only used in energy storage power supply systems such as hydroelectric, thermal, wind and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric vehicles, electric vehicles, and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also increasing.

[0124] Lithium ion battery is one of the most commonly used new energy batteries. It uses the migration of lithium ions between the positive and negative electrodes to store and release electrical energy. Lithium ion batteries have high energy density and long cycle life, and are widely used in portable electronic devices such as mobile phones, digital cameras and laptop computers, and are also widely used in electric vehicles, electric bicycles and electric tools and other large and medium-sized electric equipment, so the performance requirements of lithium ion batteries are getting higher and higher. The electrode sheet is an important part of the lithium ion battery.

[0125] In the production and manufacturing process of lithium ion batteries, the electrode sheet for manufacturing the electrode sheet needs to be coated first, and the active material is coated on the surface of the electrode sheet, and then the coated electrode sheet is dried by a drying device. The factors such as uniformity of air distribution, temperature uniformity, drying uniformity, concentration of N-methyl pyrrolidone (hereinafter referred to as NMP) in the drying gas of the drying device during drying operation are related to the quality of the electrode sheet, and the quality of the electrode sheet is related to the capacity, energy density, cycle life and other performances of the battery. Therefore, how to improve the manufacturing quality of the electrode sheet is one of the topics that the industry needs to study.

[0126] The inventor of the present disclosure finds through research that the NMP concentration detection device is arranged in the drying system to detect the NMP concentration value, the NMP concentration detection device feeds back the NMP concentration value in real time, and the NMP concentration value is adjusted to be in a preset interval by adjusting the amount of fresh air supplied to the oven and the amount of exhaust air discharged from the oven when the NMP concentration value is not in the preset interval, thereby facilitating the uniformity of the drying effect and improving the quality of the electrode sheet.

[0127] Based on such a design concept, the inventor of the present disclosure designs a drying device, which comprises a fresh air main pipe, an exhaust air main pipe, an NMP recovery system and at least two connected ovens. The ovens are provided with drying areas, and the electrode sheet is dried in the process of passing through each oven. Each oven is provided with an air pressure detection device for detecting the air pressure value in the oven as a partial air pressure value. The fresh air outlets of the ovens are respectively connected to the fresh air main pipe through pipelines, and the fresh air main pipe is provided with a total fresh air fan. Fresh air dampers are arranged at the fresh air outlets of the ovens. The exhaust air outlets of the ovens are respectively connected to the exhaust air main pipe through pipelines, and the exhaust air main pipe is provided with a total exhaust air fan. Exhaust air dampers are arranged at the exhaust air outlets of the ovens. The NMP recovery system recovers N-methyl pyrrolidone generated in the drying process of the electrode sheet in the drying area of each oven. The fresh air main pipe is connected to the outlet of the NMP recovery system, and the exhaust air main pipe is connected to the inlet of the NMP recovery system. The ovens with the partial air pressure value not in the preset partial negative pressure value interval are regarded as the ovens to be adjusted in air pressure. When there is at least one oven to be adjusted in air pressure, the output power of the total fresh air fan and the total exhaust air fan and the opening degree of the fresh air damper and the exhaust air damper of the oven to be adjusted in air pressure are adjusted so that the partial air pressure value of the oven to be adjusted in air pressure is in the preset partial negative pressure value interval.

[0128] When there is at least one oven with the partial air pressure value not in the preset partial negative pressure value interval, the output power of the total fresh air fan and the total exhaust air fan can be adjusted to change the partial air pressure values of multiple ovens at the same time, and the adjustment efficiency is high. Moreover, the opening degree of the fresh air damper and the exhaust air damper of the oven to be adjusted in air pressure can be adjusted to change the amount of fresh air entering the oven to be adjusted in air pressure and the amount of exhaust air after the drying operation. The output power of the frequency converter of the total fresh air fan and the total exhaust air fan is connected to the opening degree of the fresh air damper and the exhaust air damper in the present embodiment, and the partial air pressure value of the oven to be adjusted in air pressure is in the preset partial negative pressure value interval through coordinated adjustment, so that the partial air pressure values of all ovens quickly reach the condition of being in the preset partial negative pressure value interval. Therefore, the present embodiment improves the uniformity of the drying effect and the quality of the electrode sheet, and the adjustment efficiency is high.

[0129] The drying system provided by the embodiments of the present disclosure can be applied to, but is not limited to, a coating drying link in the electrode tab manufacturing process of a battery, for example, an electrode tab drying link of a lithium ion battery. It should be understood by those skilled in the art that the drying system provided by the embodiments of the present disclosure is not only used for drying the electrode tab in the battery production and manufacturing process, but also can be used for drying other workpieces that need to be dried.

[0130] Hereinafter, some embodiments of the present disclosure will be described in detail with reference to FIGS. 1-9.

[0131] FIG. 1 is a schematic diagram of a drying system according to some embodiments of the present disclosure; FIG. 2 is a control system diagram of the drying system according to some embodiments of the present disclosure; FIG. 3 is another control system diagram of the drying system according to some embodiments of the present disclosure; FIG. 4 is a sectional view of an oven according to some embodiments of the present disclosure; FIG. 5 is a front view of the oven according to some embodiments of the present disclosure; FIG. 6 is a sectional view of the oven according to some embodiments of the present disclosure; FIG. 7 is a sectional view of the oven according to some embodiments of the present disclosure; FIG. 8 is a top view of the oven according to some embodiments of the present disclosure; and FIG. 9 is a schematic diagram of a coating machine according to some embodiments of the present disclosure.

[0132] A first aspect of the present disclosure provides a drying device 3, as shown in FIGS. 1-9, which comprises a fresh air main pipe 33, an exhaust air main pipe 34, an NMP recovery system 39, and at least two connected ovens 31. The oven 31 is provided with a drying area 20, and the electrode tab 100 is dried during the process of passing through each oven 31. Each oven 31 is provided with a fresh air inlet 3111 for the fresh air to enter and an exhaust air outlet 3112 for the gas in the oven 31 to be exhausted. Each oven 31 is provided with a gas pressure detection device 326 for detecting the gas pressure value in the oven 31 as a partial gas pressure value. The fresh air inlet 3111 of each oven 31 is connected to the fresh air main pipe 33 through a pipeline, and the fresh air main pipe 33 is provided with a total fresh air fan 331. The fresh air inlet 3111 of each oven 31 is provided with a fresh air damper 320. The exhaust air outlet 3112 of each oven 31 is connected to the exhaust air main pipe 34 through a pipeline, and the exhaust air main pipe 34 is provided with a total exhaust air fan 341. The exhaust air outlet 3112 of each oven 31 is provided with an exhaust air damper 323. The NMP recovery system 39 is used to recover the NMP generated during the drying process of the electrode tab 100 in the drying area 20 of each oven 31. The fresh air main pipe 33 is connected to the outlet of the NMP recovery system 39, and the exhaust air main pipe 34 is connected to the inlet of the NMP recovery system 39. The oven 31 with a partial gas pressure value not in a preset partial negative pressure value interval is regarded as a pressure-adjusted oven. In the case that there is at least one pressure-adjusted oven, the output power of the total fresh air fan 331 and the total exhaust air fan 341 and the opening degree of the fresh air damper 320 and the exhaust air damper 323 of the pressure-adjusted oven are adjusted, so that the partial gas pressure value of the pressure-adjusted oven is in the preset partial negative pressure value interval.

[0133] The gas exhausted from the exhaust port 3112 of each oven 31 is converged into the NMP recovery system 39, and the NMP recovery system 39 removes the NMP gas in the gas, and the removed gas is redistributed into each oven 31 to perform the drying operation. In this way, the NMP gas concentration of the gas in the oven 31 can be reduced, thereby improving the drying quality.

[0134] The total fresh air fan 331 can be a variable frequency fan, and the frequency of the air can be adjusted, so that the air speed of the gas in the total fresh air duct 33 can be adjusted by the total fresh air fan 331, and the fresh air inlet air speed of each oven 31 can be adjusted. The total exhaust fan 341 can be a variable frequency fan, and the frequency of the air can be adjusted, so that the air speed of the gas in the total exhaust duct 34 can be adjusted by the total exhaust fan 341, and the exhaust air speed of each oven 31 can be adjusted. Therefore, by adjusting the air speed of the total fresh air fan 331 and the total exhaust fan 341, the amount of gas in the oven 31 can be changed, and the air pressure in the oven 31 can be changed.

[0135] The fresh air damper 320 can be an electrically adjusted valve, and by changing the opening of the fresh air damper 320, the flow area of the fresh air port 3111 can be adjusted, so that the speed of the fresh air entering the oven 31 can be adjusted, and the fresh air inlet air volume of each oven 31 can be adjusted. The exhaust air damper 323 can be an electrically adjusted valve, and by changing the opening of the exhaust air damper 323, the flow area of the exhaust port 3112 can be adjusted, so that the speed of the gas exhausted from the oven 31 can be adjusted, and the fresh air inlet air volume of each oven 31 can be adjusted. By adjusting the opening of the fresh air damper 320 and the exhaust air damper 323, the amount of gas in the oven 31 can be changed, and the air pressure in the oven 31 can be changed.

[0136] The air pressure detection device 326 can be a remote pressure gauge, which can remotely feedback the partial air pressure value in the oven 31. When the partial air pressure value measured by the air pressure detection device 326 is not in the preset partial negative pressure value range, the output power of the frequency converter of the total fresh air fan 331 and the total exhaust fan 341 and the opening of the fresh air damper 320 and the exhaust air damper 323 are adjusted, so that the partial air pressure value in the oven 31 is changed, so that the partial air pressure value is changed to be in the preset partial negative pressure value range.

[0137] When the partial gas pressure value of at least one oven 31 is not in the preset partial negative pressure value range, the output power of the total fresh air fan 331 and the total exhaust fan 341 can be adjusted to simultaneously change the partial gas pressure values of multiple ovens 31, and the adjustment efficiency is high. In addition, by adjusting the opening degree of the fresh air damper 320 and the exhaust air damper 323 of the gas pressure oven to be adjusted, the amount of fresh air entering the gas pressure oven to be adjusted and the amount of exhaust gas after the drying operation can be changed. The output power of the frequency converter of the total fresh air fan 331 and the total exhaust fan 341 is linked with the opening degree of the fresh air damper 320 and the exhaust air damper 323, and the partial gas pressure value of the gas pressure oven to be adjusted is in the preset partial negative pressure value range by cooperating adjustment, so that the partial gas pressure values of the ovens 31 quickly reach the condition that they are all in the preset partial negative pressure value range. Therefore, the present embodiment improves the uniformity of the drying effect and improves the quality of the electrode sheet, and the adjustment efficiency is high.

[0138] In some embodiments of the present disclosure, as shown in FIGS. 4-8, each oven 31 is provided with a fresh air inlet 3111 for fresh air to enter and an exhaust port 3112 for gas in the oven 31 to be exhausted. The NMP concentration measuring device 325 is arranged at the exhaust port 3112 of each oven 31, and the NMP concentration measuring device 325 is used to detect the partial NMP concentration value of the gas passing through the exhaust port 3112. A circulating fan 318 is arranged in each oven 31, and the circulating fan 318 is used to drive the circulating air flowing back from the drying area 20 and the gas after the confluence of the fresh air entering from the fresh air inlet 3111 to flow towards the drying area 20. The oven 31 with a partial NMP concentration value not in the preset partial NMP concentration value range is regarded as a concentration-adjusted oven. When there is at least one concentration-adjusted oven, the output power of the circulating fan 318 and the opening degree of the fresh air damper 320 and the exhaust air damper 323 of the concentration-adjusted oven are adjusted so that the partial NMP concentration value of the concentration-adjusted oven is in the preset partial NMP concentration value range.

[0139] The NMP concentration measuring device 325 is used to detect the concentration value of N-methyl pyrrolidone in the gas passing through the exhaust port 3112, and the detected concentration value is the partial NMP concentration value.

[0140] The circulating fan 318 can be a variable frequency fan, and the frequency of the fan can be adjusted. By adjusting the output power of the circulating fan 318, the speed of the fresh air entering the oven 31 can be changed, the exhaust speed of the gas after the drying operation can be changed, that is, the speed of the NMP exhaust can be changed, and the NMP concentration in the gas in the oven 31 can be changed. Therefore, by adjusting the output power of the circulating fan 318, the partial NMP concentration value detected by the NMP concentration measuring device 325 can be changed.

[0141] When the concentration of the NMP in each of the ovens 31 is not in the preset concentration range, the concentration of the NMP can be changed by adjusting the output power of the circulating fan 318, and the amount of the fresh air entering the oven and the amount of the gas exhausted after the drying operation can be changed by adjusting the opening of the fresh air damper 320 and the exhaust air damper 323, so that the concentration of the NMP in each of the ovens 31 can be in the preset concentration range. In the present embodiment, the output power of the circulating fan 318 is linked to the opening of the fresh air damper 320 and the exhaust air damper 323, and the concentration of the NMP in each of the ovens 31 is adjusted by the coordinated adjustment, so that the concentration of the NMP in each of the ovens 31 can be in the preset concentration range quickly, and the uniformity of the drying effect is improved, and the quality of the electrode plate is improved, and the adjustment efficiency is high.

[0142] In some embodiments of the present disclosure, as shown in FIG. 3, a wind box inlet speed measuring device 370 is arranged in each of the ovens 31, and the wind box inlet speed measuring device 370 is used to detect the wind speed of the gas after the circulating air and the fresh air are converged. When the wind speed detected by the wind box inlet speed measuring device 370 is not in the preset wind speed range, the circulating fan 318 is adjusted so that the wind speed detected by the wind box inlet speed measuring device 370 is in the preset wind speed range.

[0143] The wind box inlet speed measuring device 370 can be a remote anemometer, which is used to detect the wind speed of the gas after the circulating air and the fresh air are converged. The circulating air and the fresh air are blown to the drying area 20 immediately after being converged. Therefore, by making the wind speed detected by the wind box inlet speed measuring device 370 in the preset wind speed range, the wind speed of the gas sent to the drying area 20 is appropriate, and the uniformity of the wind speed blown to the electrode plate 100 is improved, and the quality of the electrode plate is improved.

[0144] In some embodiments of the present disclosure, as shown in FIGS. 3 and 4, a fresh air fan 319 and a fresh air speed measuring device 321 are arranged at the fresh air port 3111 of each of the ovens 31, the fresh air fan 319 is used to adjust the wind speed of the fresh air port 3111, and the fresh air speed measuring device 321 is used to detect the wind speed of the fresh air port 3111. An exhaust air fan 322 and an exhaust air speed measuring device 324 are arranged at the exhaust air port 3112 of each of the ovens 31, the exhaust air fan 322 is used to adjust the wind speed of the exhaust air port 3112, and the exhaust air speed measuring device 324 is used to detect the wind speed of the exhaust air port 3112.

[0145] The fresh air fan 319 can be a variable frequency fan, and the frequency of the air can be adjusted, so that the speed of the air entering the fresh air outlet 3111 can be adjusted by the fresh air fan 319. Therefore, by adjusting the output power of the fresh air fan 319, the amount of air entering the oven 31 can be changed. The exhaust fan 322 can be a variable frequency fan, and the frequency of the air can be adjusted, so that the speed of the air discharged from the oven 31 can be adjusted by the exhaust fan 322. Therefore, by adjusting the output power of the exhaust fan 322, the amount of air discharged from the oven 31 can be changed. By adjusting the output power of the fresh air fan 319 and the exhaust fan 322, the amount of fresh air in the oven 31 can be changed, so that the partial NMP concentration value of the oven 31 can be changed. In addition, by adjusting the output power of the fresh air fan 319 and the exhaust fan 322, the total air volume in the oven 31 can also be changed, so that the partial air pressure value of the oven 31 can be changed.

[0146] The fresh air speed measuring device 321 can be a remote air speed meter, which can detect the speed of the fresh air outlet 3111 and remotely transmit the measured speed value. During the adjustment of the fresh air fan 319, the speed value measured by the fresh air speed measuring device 321 is referred to, so that the fresh air fan 319 is adjusted more accurately. The exhaust speed measuring device 324 can be a remote air speed meter, which can detect the speed of the exhaust outlet 3112 and remotely transmit the measured speed value. During the adjustment of the exhaust fan 322, the speed value measured by the exhaust speed measuring device 324 is referred to, so that the exhaust fan 322 is adjusted more accurately.

[0147] Specifically, in the case of at least one oven to be adjusted, the output power of the total fresh air fan 331 and the total exhaust fan 341, the opening degree of the fresh air damper 320 and the exhaust damper 323 of the oven to be adjusted, and the output power of the fresh air fan 319 and the exhaust fan 322 are adjusted, so that the partial air pressure value of the oven to be adjusted is in the preset partial negative pressure value range. By interlocking the total fresh air fan 331, the total exhaust fan 341, the fresh air damper 320, the exhaust damper 323, the fresh air fan 319 and the exhaust fan 322, when adjustment is needed, the total fresh air fan 331, the total exhaust fan 341, the fresh air damper 320, the exhaust damper 323, the fresh air fan 319 and the exhaust fan 322 are adjusted according to the set interlocking rule, so that the partial air pressure value of each oven 31 is in the preset partial negative pressure value range, thereby improving the uniformity of the drying effect and improving the quality of the electrode sheet. In addition, the adjustment efficiency is high.

[0148] Specifically, in the case that there is at least one concentration-adjusted oven, the output power of the circulating fan 318, the opening of the fresh air damper 320 and the exhaust air damper 323, and the output power of the fresh air fan 319 and the exhaust air fan 322 of the concentration-adjusted oven are adjusted so that the partial NMP concentration value of the concentration-adjusted oven is in the preset partial NMP concentration value interval. By interlocking the circulating fan 318, the fresh air damper 320, the exhaust air damper 323, the fresh air fan 319, and the exhaust air fan 322, when adjustment is needed, the circulating fan 318, the fresh air damper 320, the exhaust air damper 323, the fresh air fan 319, and the exhaust air fan 322 are adjusted according to the set interlocking rule, so that the partial NMP concentration value of each oven 31 is in the preset partial NMP concentration value interval, thereby improving the uniformity of the drying effect and improving the quality of the electrode sheet. Moreover, the adjustment efficiency is high.

[0149] In some embodiments of the present disclosure, a heat exchange device 350 is provided in each oven 31, which is used to heat the temperature of the gas after the circulation air and fresh air are converged. In the case that there is at least one concentration-adjusted oven, the heating temperature of the heat exchange device 350 of the concentration-adjusted oven is adjusted so that the partial NMP concentration value of the concentration-adjusted oven is in the preset partial NMP concentration value interval.

[0150] The heat exchange device 350 is used to heat the temperature of the gas after the circulation air and fresh air are converged, thereby increasing the temperature of the gas blown to the drying area 20, thereby achieving the drying of the electrode sheet 100. The higher the drying temperature of the electrode sheet 100, the faster the NMP is generated, which will make the partial NMP concentration value higher. Therefore, by changing the heating temperature of the heat exchange device 350, the partial NMP concentration value can be affected, so that the partial NMP concentration value is in the preset partial NMP concentration value interval.

[0151] The heat exchange device 350 can be, but is not limited to, a heat-conducting oil heating device, which has a heat-conducting oil flow meter 351 and a thermocouple 352 at the oil inlet end, and a thermocouple 352 at the oil outlet end. The heating temperature is adjusted by adjusting the flow of hot oil into the heat-conducting oil heating device through the heat-conducting oil flow meter 351.

[0152] On the basis of adjusting the circulating fan 318, the fresh air damper 320, the exhaust air damper 323, the fresh air fan 319, and the exhaust air fan 322, the heating temperature of the heat exchange device 350 is also adjusted, which can accelerate the adjustment rate of the partial NMP concentration value.

[0153] In some embodiments of the present disclosure, in the case that there is at least one concentration-adjusted oven, the output power of the total fresh air fan 331 and / or the total exhaust air fan 341 is adjusted so that the partial NMP concentration value of the concentration-adjusted oven is in the preset partial NMP concentration value interval.

[0154] The total fresh air fan 331 can adjust the air speed of the gas in the fresh air main pipe 33, thereby adjusting the fresh air intake of each oven 31, and further adjusting the output power of the total fresh air fan 331, thereby changing the partial NMP concentration value of the oven 31. The total exhaust fan 341 can adjust the air speed of the gas in the exhaust air main pipe 34, thereby adjusting the exhaust air volume of each oven 31, and further adjusting the output power of the total exhaust fan 341, thereby changing the partial NMP concentration value of the oven 31.

[0155] Therefore, on the basis of adjusting the circulating fan 318, the fresh air damper 320, the exhaust air damper 323, the fresh air fan 319, the exhaust air fan 322, and the heat exchange device 350, the output power of the total fresh air fan 331 and / or the total exhaust fan 341 is also adjusted, which can accelerate the adjustment rate of the partial NMP concentration value.

[0156] In some embodiments of the present disclosure, as shown in FIG. 3, the exhaust air main pipe 34 is provided with a total exhaust NMP concentration measuring device 343 for detecting the total NMP concentration value of the gas passing through the exhaust air main pipe 34. When there is at least one oven with a concentration to be adjusted, and the total NMP concentration value is not in the preset total NMP concentration value interval, the output power of the circulating fan 318 of the oven with a concentration to be adjusted and the heating temperature of the heat exchange device 350 are first adjusted, so that the total NMP concentration value is in the preset total NMP concentration value interval. Then, the output power of the fresh air fan 319 and the exhaust air fan 322 of the oven with a concentration to be adjusted, the opening of the fresh air damper 320 and the exhaust air damper 323, and the heating temperature of the heat exchange device 350 are adjusted, so that the partial NMP concentration value of the oven with a concentration to be adjusted is in the preset partial NMP concentration value interval.

[0157] The total exhaust NMP concentration measuring device 343 is used to detect the content of N-methyl pyrrolidone in the gas in the exhaust air main pipe 34 as the total NMP concentration value. When adjusting, the output power of the circulating fan 318 of the oven with a concentration to be adjusted and the heating temperature of the heat exchange device 350 are first adjusted, so that the total NMP concentration value is in the preset total NMP concentration value interval. This will make the partial NMP concentration value of the oven with a concentration to be adjusted close to the preset partial NMP concentration value interval. Then, the output power of the fresh air fan 319 and the exhaust air fan 322 of the oven with a concentration to be adjusted, the opening of the fresh air damper 320 and the exhaust air damper 323, and the heating temperature of the heat exchange device 350 are adjusted, so that the partial NMP concentration value of the oven with a concentration to be adjusted is in the preset partial NMP concentration value interval.

[0158] Therefore, the total NMP concentration value is first brought into the preset total NMP concentration value interval, so that the plurality of concentration adjustment ovens can be adjusted at the same time, which is beneficial to improve the adjustment efficiency; then the partial NMP concentration value of the concentration adjustment oven is brought into the preset partial NMP concentration value interval, so that the partial NMP concentration value of each oven 31 is in the preset partial NMP concentration value interval, which is first coarsely adjusted and then finely adjusted, not only improving the adjustment efficiency, but also improving the adjustment accuracy, thereby being more beneficial to improve the quality of the electrode sheet.

[0159] In some embodiments of the present disclosure, the exhaust air main pipe 34 is provided with a total pressure detection device 344 for detecting the total air pressure value in the exhaust air main pipe 34. In the case that there is at least one air pressure adjustment oven and the total air pressure value is not in the preset total negative pressure value interval, the output power of the total fresh air fan 331 and the total exhaust air fan 341 is first adjusted to bring the total air pressure value into the preset total negative pressure value interval, and then the output power of the fresh air fan 319 and the exhaust air fan 322 of the air pressure adjustment oven and the opening degree of the fresh air damper 320 and the exhaust air damper 323 are adjusted to bring the partial air pressure value into the preset partial negative pressure value interval.

[0160] The total pressure detection device 344 can adopt a remote negative pressure gauge. The total pressure detection device 344 is used to detect the total air pressure value in the exhaust air main pipe 34. During adjustment, the output power of the total fresh air fan 331 and the total exhaust air fan 341 is first adjusted to bring the total air pressure value into the preset total negative pressure value interval, which will make the partial air pressure value of the air pressure adjustment oven close to the preset partial negative pressure value interval, and then the output power of the fresh air fan 319 and the exhaust air fan 322 of the air pressure adjustment oven and the opening degree of the fresh air damper 320 and the exhaust air damper 323 are adjusted to bring the partial air pressure value into the preset partial negative pressure value interval.

[0161] Therefore, the total air pressure value is first brought into the preset total negative pressure value interval, which can affect the partial air pressure value of the plurality of air pressure adjustment ovens, which is beneficial to improve the adjustment efficiency; then the partial air pressure value of the air pressure adjustment oven is brought into the preset partial air pressure value interval, so that the partial air pressure value of each oven 31 is in the preset partial negative pressure value interval, which is first coarsely adjusted and then finely adjusted, not only improving the adjustment efficiency, but also improving the adjustment accuracy, thereby being more beneficial to improve the quality of the electrode sheet.

[0162] In some embodiments of the present disclosure, the fresh air main pipe 33 is provided with a total fresh air speed detection device 321, which detects the air speed of the gas in the fresh air main pipe 33 during adjustment of the total fresh air fan 331; and the exhaust air main pipe 34 is provided with a total exhaust air speed detection device 342, which detects the air speed of the gas in the exhaust air main pipe 34 during adjustment of the total exhaust air fan 341.

[0163] The total fresh air speed measuring device 321 can adopt a remote wind speed meter, which can measure the wind speed of the total fresh air pipe 33 and remotely transmit the measured wind speed value. During the adjustment of the total fresh air fan 331, the wind speed value measured by the total fresh air speed measuring device 321 is referred to, so that the total fresh air fan 331 is adjusted more accurately. The total exhaust air speed measuring device 342 can adopt a remote wind speed meter, which can detect the wind speed of the total exhaust air pipe 34 and remotely transmit the measured wind speed value. During the adjustment of the total exhaust air fan 341, the wind speed value measured by the total exhaust air speed measuring device 342 is referred to, so that the total exhaust air fan 341 is adjusted more accurately.

[0164] In this way, the accuracy of the wind speed adjustment of the total fresh air pipe 33 and the total exhaust air pipe 34 can be improved, thereby facilitating the improvement of the accuracy of the air pressure adjustment and the NMP concentration adjustment, thereby improving the uniformity of the drying effect, improving the quality of the electrode sheet, and the adjustment efficiency is high.

[0165] In some embodiments of the present disclosure, the total fresh air pipe 33 is provided with a total fresh air NMP concentration measuring device 333 for detecting the NMP gas concentration of the gas in the total fresh air pipe 33. The total fresh air NMP concentration measuring device 333 can assist in adjusting the N-methyl pyrrolidone concentration by taking the concentration value detected by the total fresh air NMP concentration measuring device 333 as a reference during the adjustment.

[0166] In some embodiments of the present disclosure, each oven 31 includes an oven body 311 and a first air box 312 and a second air box 328 arranged in the oven body 311, the first air box 312 and the second air box 328 are oppositely arranged and define a drying area 20 therebetween, the first air box 312 is provided with a first air inlet 3122 for gas to enter, the second air box 328 is provided with a second air inlet 3292 for gas to enter, the first air box 312 has a first box wall 3121 facing the second air box 328, the first box wall 3121 is provided with a plurality of first air nozzles 314 with outlets facing the drying area 20, the first air nozzles 314 are used for the gas in the first air box 312 to be discharged towards the electrode sheet 100; the box wall of the second air box 328 facing the first air box 312 is provided with a plurality of second air nozzles 3291 with outlets facing the drying area 20, the second air nozzles 3291 are used for the gas in the second air box 328 to be discharged towards the electrode sheet 100, the oven body 311 is provided with a fresh air inlet 3111 and an exhaust air outlet 3112, the fresh air inlet 3111 is communicated with the first air inlet 3122 of the first air box 312 and the second air inlet 3292 of the second air box 328, and the exhaust air outlet 3112 is communicated with the drying area 20.

[0167] As shown in FIGS. 5-8, the flow direction of the gas in the cabinet 311 is indicated by arrows. The fresh air entering the cabinet 311 from the fresh air inlet 3111 is divided into two paths, one of which enters the first air box 312 through the first air inlet 3122 of the first air box 312, and then enters the drying area 20 through the first air nozzle 314, blowing against the surface of the pole piece 100 coated with the active material slurry passing through the drying area 20, and the other path enters the second air box 328 through the second air inlet 3292 of the second air box 328, and then enters the drying area 20 through the second air nozzle 3291, blowing against the other surface of the pole piece 100 passing through the drying area 20, thereby achieving drying of the pole piece 100.

[0168] In some embodiments of the present disclosure, a return air passage is provided in the cabinet 311, and a circulating fan 318 is provided in the return air passage. The fresh air inlet 3111 and the exhaust air outlet 3112 are respectively connected to the return air passage. The circulating fan 318 is used to drive the gas in the drying area 20 to flow through the exhaust air outlet 3112 through the return air passage, so that part of the gas is discharged through the exhaust air outlet 3112, and the remaining gas in the return air passage and the fresh air supplemented from the fresh air inlet 3111 enter the first air inlet 3122 and the second air inlet 3292 through the return air passage. The return air passage is provided with a heat exchange device 350, an air box air inlet speed measuring device 370, and the circulating fan 318 between the fresh air inlet 3111 and the first air inlet 3122 and the second air inlet 3292.

[0169] The gas in the drying area 20 is circulated back to the first air inlet 3122 of the first air box 312 and the second air inlet 3292 of the second air box 328 under the action of the circulating fan 318. In the process of flowing, it will flow through the exhaust air outlet 3112 and the fresh air inlet 3111 in turn. When flowing through the exhaust air outlet 3112, part of the gas will flow to the exhaust air main pipe 34 through the exhaust air outlet 3112 along the pipeline. The remaining gas in the return air passage continues to circulate back to the first air inlet 3122 and the second air inlet 3292 as circulating air. When the circulating air flows through the fresh air inlet 3111, the fresh air supplemented through the fresh air inlet 3111 will converge with the circulating air. The converged gas is heated by the heat exchange device 350 to form hot air, which then enters the first air box 312 and the second air box 328, and then enters the drying area 20 for drying operation.

[0170] The gas flowing in the channel between the fresh air outlet 3111 and the first air bellow 312 and the second air bellow 328 of the return air channel is the gas formed after the fresh air and the circulating air converge. The heat exchange device 350 is arranged at this position, which can heat the temperature of the gas formed after the fresh air and the circulating air converge. The temperature heated by the heat exchange device 350 is directly related to the temperature of the gas blown to the drying area 20 by the first air nozzle 314 of the first air bellow 312 and the second air nozzle 3291 of the second air bellow 328. Therefore, by adjusting the heating temperature of the heat exchange device 350, the temperature of the gas sent to the drying area 20 can be suitable, so that the amount of N-methyl pyrrolidone generated by drying is within a suitable range, thereby improving the quality of the electrode sheet.

[0171] In this way, part of the gas in the drying area 20 can re-enter the first air bellow 312 and the second air bellow 328 through the return air channel, and then be blown to the electrode sheet 100 again, thereby recycling the gas. The recycled gas still has a relatively high heat, which is beneficial to reduce the loss of heat and thereby improve the utilization rate of heat.

[0172] In some embodiments of the present disclosure, the outer side of the first bellow wall 3121 is provided with a heating device 315.

[0173] The heating device 315 in the drying oven 31 is used to heat the gas in the drying area 20, so as to be able to dry the electrode sheet 100 passing through the drying area 20. At the same time, the gas in the first air bellow 312 is blown to the passing electrode sheet 100 through the first air nozzle 314, thereby promoting the drying efficiency of the electrode sheet 100. The first air nozzle 314 is uniformly distributed on the first bellow wall 3121, which is beneficial to improve the uniformity of the drying effect and further improve the quality of the electrode sheet.

[0174] The heating device 315 is a device for heating the gas in the drying area 20, which can be but is not limited to a resistance heat exchange device or an infrared heat exchange device.

[0175] The resistance heat exchange device is a device that heats an object based on the heat generated by Joule effect when current flows through.

[0176] The infrared heat exchange device mainly heats air through point-to-point heat radiation (principle: when the vibration or rotation frequency of molecular groups is close to the infrared wavelength frequency, the energy level of vibration or rotation jumps, molecular movement increases, and temperature rises). When performing reflection coating, thick coating, and metal coating, the preheating time is fast, the heating time is shorter, and the set temperature can be reached in a short time. It has stronger penetration and high drying efficiency, and can quickly dry the "inner layer" and "middle layer" of the coating of the electrode sheet 100.

[0177] In this way, the drying effect on the pole piece 100 passing through the drying area 20 is achieved, and the uniformity of drying is high, and the quality of the formed electrode pole piece is high.

[0178] In some embodiments of the present disclosure, a first air inlet 3122 of the first air bellow 312 is provided with a first air inlet damper 316, and a second air inlet 3292 of the second air bellow 328 is provided with a second air inlet damper 3293. During the process of adjusting the output power of the circulating fan 318, the opening degree of the first air inlet damper 316 and / or the second air inlet damper 3293 is adjusted.

[0179] The first air inlet damper 316 can be an electrically adjusted valve. By adjusting the opening degree of the first air inlet damper 316, the flow area of the first air inlet 3122 can be adjusted, so as to adjust the speed of the gas entering the first air bellow 312, thereby affecting the wind speed of the gas blown by the first air nozzle 314 into the drying area 20. Therefore, during the process of adjusting the output power of the circulating fan 318, the wind speed blown to the pole piece 100 can be controlled within a suitable range by adjusting the first air inlet damper 316, so as to improve the uniformity of drying and the quality of the formed electrode pole piece.

[0180] The second air inlet damper 3293 can be an electrically adjusted valve. By adjusting the opening degree of the second air inlet damper 3293, the flow area of the second air inlet 3292 can be adjusted, so as to adjust the speed of the gas entering the second air bellow 328, thereby affecting the wind speed of the gas blown by the second air nozzle 3291 into the drying area 20. Therefore, during the process of adjusting the output power of the circulating fan 318, the wind speed blown to the pole piece 100 can be controlled within a suitable range by adjusting the opening degree of the second air inlet damper 3293, so as to improve the uniformity of drying and the quality of the formed electrode pole piece.

[0181] In some embodiments of the present disclosure, a first air inlet 3122 of the first air bellow 312 is provided with a first air inlet damper 316, and a second air inlet 3292 of the second air bellow 328 is provided with a second air inlet damper 3293. During the process of adjusting the output power of the circulating fan 318, the opening degree of the first air inlet damper 316 and / or the second air inlet damper 3293 is adjusted.

[0182] In some embodiments of the present disclosure, a first air inlet 3122 of the first air bellow 312 is provided with a first air inlet damper 316, and a second air inlet 3292 of the second air bellow 328 is provided with a second air inlet damper 3293. During the process of adjusting the output power of the circulating fan 318, the opening degree of the first air inlet damper 316 and / or the second air inlet damper 3293 is adjusted.

[0183] The first air inlet speed measuring device 317 can adopt a remote anemometer to detect the air speed of the gas passing through the first air inlet 3122. The second air inlet speed measuring device 3294 can adopt a remote anemometer to detect the air speed of the gas passing through the second air inlet 3292. The drying device can assist in adjusting the air pressure or the concentration of N-methylpyrrolidone gas in the oven 31 by taking the air speeds detected by the first air inlet speed measuring device 317 and the second air inlet speed measuring device 3294 as a reference, thereby improving the uniformity of the drying effect and improving the quality of the electrode sheet.

[0184] In some embodiments of the present disclosure, as shown in FIGS. 5 to 8, the cabinet 311 includes a first cabinet shell 3113, a second cabinet shell 3114, a first air inlet pipe 3117, a first air return pipe 3116, a fresh air inlet 3111 and an exhaust air outlet 3112 arranged on the top wall of the second cabinet shell 3114, a circulating fan 318 arranged on the side wall of the second cabinet shell 3114, a first air box 312 arranged in the first cabinet shell 3113, the first air inlet pipe 3117 being connected between the first air inlet 3122 of the first air box 312 in the first cabinet shell 3113 and the second cabinet shell 3114, the first air return pipe 3116 being connected between the region defined between the outer wall of the first air box 312 in the first cabinet shell 3113 and the inner wall of the first cabinet shell 3113 and the second cabinet shell 3114, and the opening of the end of the first air return pipe 3116 extending into the first cabinet shell 3113 being the first air return opening 31160. A second air box 328 is arranged in the first cabinet shell 3113, the second air inlet 3292 of the second air box 328 in the first cabinet shell 3113 and the second cabinet shell 3114 being connected by a second air inlet pipe 3118, and the region between the other walls of the second air box 328 in the first cabinet shell 3113 except for the wall facing the drying area 20 and the inner wall of the first cabinet shell 3113 and the second cabinet shell 3114 being connected by a second air return pipe 3115, and the opening of the end of the second air return pipe 3115 extending into the first cabinet shell 3113 being the second air return opening 31150.

[0185] The fresh air enters the second box shell 3114 through the fresh air inlet 3111, then enters the first air box 312 through the first air inlet pipe 3117, then the gas in the first air box 312 enters the drying area 20 through the first air nozzle 314 and blows to the pole piece 100, after that, the gas in the drying area 20 flows out of the drying area 20 along the conveying path of the pole piece 100, then enters the first return air pipe 3116 along the area between the inner wall of the first box shell 3113 and the box wall of the first air box 312 except the first box wall 3121, then returns to the second box shell 3114 through the first return air pipe 3116, part of the gas in the second box shell 3114 enters the first air inlet pipe 3117 again to circulate as mentioned above, and another part of the gas in the second box shell 3114 flows out through the air outlet 3112. It can be understood that the gas entering the first air inlet pipe 3117 includes the gas flowing back from the first return air pipe 3116 and the fresh air supplemented from the fresh air inlet 3111.

[0186] The fresh air enters the second box shell 3114 through the fresh air inlet 3111, then part of the gas in the second box shell 3114 enters the second air box 328 through the second air inlet pipe 3118, then the gas in the second air box 328 enters the drying area 20 through the second air nozzle 3291 and blows to the pole piece 100, after that, the gas in the drying area 20 flows out of the drying area 20 along the conveying path of the pole piece 100, then part of the gas enters the second return air pipe 3115 along the area between the inner wall of the first box shell 3113 and the box wall of the second air box 328 in the first box shell 3113 except the box wall facing the drying area 20, then returns to the second box shell 3114 through the second return air pipe 3115, part of the gas in the second box shell 3114 enters the second air inlet pipe 3118 again to circulate as mentioned above, and another part of the gas in the second box shell 3114 flows out through the air outlet 3112. It can be understood that in the above-mentioned gas flow process through the second air box 328, the gas flow through the first air box 312 is also carried out at the same time, therefore, the gas entering the second air box 328 through the second air inlet pipe 3118 includes the gas flowing back from the first return air pipe 3116, the gas flowing back from the second return air pipe 3115 and the fresh air supplemented from the fresh air inlet 3111, similarly, the gas entering the first air box 312 through the first air inlet pipe 3117 includes the gas flowing back from the first return air pipe 3116, the gas flowing back from the second return air pipe 3115 and the fresh air supplemented from the fresh air inlet 3111.

[0187] It should be noted that the return air passage includes the space in the second box shell 3114, the first air inlet pipe 3117, the area between the other box walls of the first air box 312 in the first box shell 3113 except the first box wall 3121 and the inner wall of the first box shell 3113, and the first return air pipe 3116. The return air passage also includes the space in the second air inlet pipe 3118, the area between the other box walls of the second air box 328 in the first box shell 3113 except the box wall facing the drying area 20 and the inner wall of the first box shell 3113, and the second return air pipe 3115.

[0188] In some embodiments of the present disclosure, the first air box 312 and the second air box 328 are distributed along the vertical direction Z, and the first air box 312 is arranged above the second air box 328, and the second air nozzle 3291 on the second air box 328 supports the pole piece 100 located in the drying area 20.

[0189] Specifically, the first box shell 3113 and the second box shell 3114 are arranged in the first direction Y, the first air inlet pipe 3117 and the first return air pipe 3116 extend along the first direction Y respectively, and are distributed along the second direction X, the first direction Y and the second direction X are both perpendicular to the vertical direction Z, and the intersection includes perpendicular intersection. The fresh air outlet 3111 and the exhaust air outlet 3112 are arranged on the top of the second box shell 3114, the circulating fan 318 is arranged on the side wall of the second box shell 3114 away from the first box shell 3113, and the drying area 20 is along the second direction X.

[0190] In some embodiments of the present disclosure, the first box wall 3121 is provided with a return air nozzle 340 for the gas in the drying area 20 to return to the return air passage.

[0191] Specifically, the return air nozzle 340 is communicated with the area between the other box walls of the first air box 312 in the first box shell 3113 except the first box wall 3121 and the inner wall of the first box shell 3113.

[0192] The gas in the drying area 20 can enter the return air passage through the return air nozzle 340 arranged on the first box wall 3121, so as to shorten the flow path of the gas, reduce the resistance and wind speed fluctuation in the circulation process, improve the uniformity of the transverse air volume, make the balance drying of the "surface layer" of the coating of the pole piece 100, so as to achieve the uniform drying of the inner and outer layers of thick coating, improve the transverse cracking and edge over-drying, and thus improve the quality of the electrode pole piece.

[0193] Specifically, the gas pressure detection device 326 is arranged in the area between the side of the first air box 312 of the box body 311 away from the drying area 20 and the inner wall of the box body 311.

[0194] In some embodiments of the present disclosure, the outer side of the first box wall 3121 of the first wind box 312 is provided with a visual detection device 327 for detecting the appearance of the pole piece 100 located in the drying area 20.

[0195] The visual detection device 327 can adopt an AI visual detection device, which can monitor the appearance of the pole piece 100 inside the drying area 20 in real time. When an abnormality occurs in the appearance of the pole piece 100, the drying data can be corrected in time by controlling the adjustment of the wind speed, negative pressure, or NMP concentration, so as to improve the coating drying quality and efficiency.

[0196] In some embodiments of the present disclosure, the visual detection device 327 is connected to the outer side of the first box wall 3121 through a mounting assembly, which is configured to be able to adjust the position of the visual detection device 327 along the width direction of the pole piece 100.

[0197] For example, the visual detection device 327 can realize reciprocating movement along the width direction of the pole piece 100 through a lead screw nut assembly. Of course, other linear driving devices can also be used to realize the adjustable position of the visual detection device 327, which will not be described here.

[0198] In this way, the appearance of the pole piece 100 can be detected in a larger range, and the coating drying quality and efficiency can be further improved.

[0199] In some embodiments of the present disclosure, as shown in FIG. 8, a filter 353 is provided outside the second box shell 3114 close to the inlet of the first air inlet pipe 3117 and the inlet of the second air inlet pipe 3118, and a heat exchange device 350 is provided on the side of the filter 353 away from the inlet of the first air inlet pipe 3117 and the inlet of the second air inlet pipe 3118.

[0200] The filter 353 can filter and purify the passing gas, and the heat exchange device 350 is used for heat exchange with the passing gas to heat the gas, so that the heated gas blows to the pole piece 100 to dry the pole piece 100.

[0201] The heat exchange device 350 can be but not limited to a heat conduction oil heating device, which is provided with a heat conduction oil flow meter 351 and a thermocouple 352 at the oil inlet end, and a thermocouple 352 at the oil outlet end. The flow of the hot oil entering the heat conduction oil heating device is adjusted by the heat conduction oil flow meter 351 to adjust the heating temperature.

[0202] In some embodiments of the present disclosure, the first wind box 312 and the second wind box 328 are respectively connected to the top wall and the bottom wall of the first box shell 3113 through a connecting assembly 360, which is configured to be able to adjust the position of the first wind box 312 and / or the second wind box 328 along the vertical direction Z.

[0203] In this way, the distance between the first air box 312 and the second air box 328, i.e. the size of the drying area 20 in the vertical direction Z, can be adjusted by the connecting assembly 360, so as to reduce the distance between the pole piece 100 and the air inlet speed measuring device 370, the first air nozzle 314 and the heating device 315 arranged on the first air box wall 3121, and the drying efficiency can be improved by adjusting the distance. With the same length of the oven, the high-efficiency drying device can save energy and achieve the purpose of saving the number of ovens, thereby saving the development cost.

[0204] For example, the connecting assembly 360 can be an adjusting screw, a linear motor, a pneumatic cylinder or other linear driving mechanism, which can realize the installation of the first air box 312 and the second air box 328 in the first air box shell 3113 and adjust the positions of the first air box 312 and the second air box 328 in the vertical direction Z.

[0205] The second aspect of the present disclosure provides a coating machine, which comprises a first coating head 44a, a second coating head 44b, a climbing mechanism 52 and first and second drying devices 3a and 3b formed by the above drying device, the first coating head 44a is used for coating the first surface of the substrate to form a pole piece 100; the first drying device 3a is arranged downstream of the first coating head 44a and is used for drying the pole piece 100 with the first surface upward; the second coating head 44b is arranged downstream of the first drying device 3a and is used for coating the second surface of the pole piece 100; the climbing mechanism 52 is arranged downstream of the second coating head 44b and upstream of the second drying device 3b, the climbing mechanism 52 is used for supporting and pulling the pole piece 100 from one side of the first surface of the pole piece 100, so that the pole piece 100 enters the second drying device 3b with the second surface upward, and the second drying device 3b is used for drying the pole piece 100 with the second surface upward.

[0206] The two surfaces of the pole piece 100 are respectively a first surface and a second surface, the first coating head 44a is used for coating the first surface of the pole piece 100, then the first drying device 3a dries the pole piece 100 conveyed from the first coating head 44a, the second coating head 44b is used for coating the second surface of the pole piece 100, and then the second drying device 3b dries the pole piece 100 conveyed from the second coating head 44b. In this way, the coating and drying work of the two surfaces of the pole piece 100 is completed.

[0207] The first coating head 44a, the first drying device 3a and the second coating head 44b are arranged in a lower row, the surface to be dried in the first drying device 3a is the first surface, the first surface faces upward, the climbing mechanism 52 and the second drying device 3b are arranged in an upper row, the pole piece 100 is folded upward through the climbing mechanism 52, so that the originally downward second surface output from the first drying device 3a is folded to face upward, that is, the second surface to be dried by the second drying device 3b faces upward, the surfaces to be dried in the first drying device 3a and the second drying device 3b all face upward, so that the other surface contacts the second air nozzle 3291 of the drying device, the pole piece 100 is supported by the second air nozzle 3291, the surface to be dried does not contact the first air nozzle 314, and the drying effect is improved.

[0208] In some embodiments of the present disclosure, as shown in FIG. 9, the coating machine comprises, in sequence, an unwinding unit 41, a roller assembly 42, an unwinding deviation rectifying unit 43, a first coating head 44a, a first drying device 3a, a first deviation rectifying unit 45, a first traction unit 46, a first surface density measuring system 47, a first traction deviation rectifying unit 48, a second coating head 44b, a climbing mechanism 52, a second drying device 3b, a second deviation rectifying unit 53, a second traction unit 54, an additional drying device 55, a cooling traction unit 56, a second surface density measuring system 57, a winding deviation rectifying unit 58 and a winding unit 59. The unwinding unit 41 is used for automatic unwinding and walking of the pole piece 100; the roller assembly 42 realizes walking support of the pole piece 100; the unwinding deviation rectifying unit 43 realizes walking centering of the pole piece 100; the first coating head 44a is used for coating the first surface of the pole piece 100; the first drying device 3a is used for first drying of the pole piece 100; the first deviation rectifying unit 45 realizes centering of the pole piece 100, and also plays a role in flattening and wrinkle removal of the pole piece 100; the first traction unit 46 realizes traction and tension interruption during walking of the pole piece 100, and ensures walking tension balance; the first surface density measuring system 47 realizes real-time monitoring of the density of the first coating surface; the first traction deviation rectifying unit 48 realizes centering of the pole piece 100; the second coating head 44b coats the second surface of the pole piece 100; the climbing mechanism 52 realizes traction walking of the pole piece 100, and ensures walking stability; the second drying device 3b is used for second drying of the pole piece 100; the second deviation rectifying unit 53 is used for centering of the pole piece 100, and also plays a role in flattening and wrinkle removal of the pole piece 100; the second traction unit 54 realizes traction and tension interruption during walking of the pole piece 100, and ensures walking tension balance; the additional drying device 55 performs third drying of the pole piece 100, and is used for improving process performance of the electrode pole piece; the cooling traction unit 56 realizes traction walking and cooling of the film formed by the pole piece 100, and ensures that the film does not wrinkle during walking; the second surface density measuring system 57 realizes real-time monitoring of the density of the first and second coating surfaces; the winding deviation rectifying unit 58 realizes centering before winding of the film; and the winding unit 59 realizes automatic winding and automatic roll changing of the film.

[0209] Specifically, the coating machine further comprises an intelligent control closed loop system 51, which is used for closed loop control and adjustment of the coating machine.

[0210] The third aspect of the present disclosure provides a drying method, using the drying device 3, the oven 31 is provided with a drying area 20, the pole piece 100 is dried in the process of passing through each oven 31, each oven 31 is provided with a fresh air inlet 3111 for the fresh air to enter and an exhaust port 3112 for the gas in the oven 31 to be discharged, each oven 31 is provided with a gas pressure detection device 326, which is used to detect the gas pressure value in the oven 31 as a partial gas pressure value; the fresh air inlet 3111 of each oven 31 is connected to the fresh air main pipe 33 through a pipeline, the fresh air main pipe 33 is provided with a total fresh air fan 331, and the fresh air inlet 3111 of each oven 31 is provided with a fresh air air valve 320; the exhaust port 3112 of each oven 31 is connected to the exhaust main pipe 34 through a pipeline, the exhaust main pipe 34 is provided with a total exhaust fan 341, and the exhaust port 3112 of each oven 31 is provided with an exhaust air valve 323; the NMP recovery system 39 is used to recover the NMP generated in the drying process of the pole piece 100 in the drying area 20 of each oven 31, the fresh air main pipe 33 is connected to the outlet of the NMP recovery system 39, and the exhaust main pipe 34 is connected to the inlet of the NMP recovery system 39.

[0211] As shown in FIG. 10, the drying method comprises:

[0212] S1000, a gas pressure adjusting step: taking the oven whose partial gas pressure value detected by the gas pressure detection device is not in the preset partial negative pressure value interval as a to-be-adjusted gas pressure oven, in the case that there is at least one to-be-adjusted gas pressure oven, adjusting the output power of the total fresh air fan and the total exhaust fan and the opening degree of the fresh air air valve and the exhaust air valve of the to-be-adjusted gas pressure oven, so that the partial gas pressure value of the to-be-adjusted gas pressure oven is in the preset partial negative pressure value interval.

[0213] When the partial air pressure value of at least one oven 31 is not in the preset partial negative pressure value range, the output power of the total fresh air fan 331 and the total exhaust fan 341 can be adjusted to simultaneously change the partial air pressure values of multiple ovens 31, and the adjustment efficiency is high. In addition, by adjusting the opening degree of the fresh air damper 320 and the exhaust air damper 323 of the air pressure oven to be adjusted, the amount of fresh air entering the air pressure oven to be adjusted and the amount of exhaust gas after the drying operation can be changed. In the present embodiment, the output power of the frequency converter of the total fresh air fan 331 and the total exhaust fan 341 is linked with the opening degree of the fresh air damper 320 and the exhaust air damper 323, and the partial air pressure value of the air pressure oven to be adjusted is adjusted by cooperation to be in the preset partial negative pressure value range, so that the partial air pressure values of the ovens 31 quickly reach the condition that they are all in the preset partial negative pressure value range. Therefore, the present embodiment improves the uniformity of the drying effect and improves the quality of the electrode sheet, and the adjustment efficiency is high.

[0214] In some embodiments of the present disclosure, a circulating fan 318 is arranged in each oven 31, and the circulating fan 318 is used to drive the circulating air flowing back from the drying area 20 and the gas after the confluence of the fresh air entering from the fresh air inlet to flow towards the drying area 20. A wind box inlet speed measuring device 370 is arranged in each oven 31, and the wind box inlet speed measuring device 370 is used to detect the wind speed value of the gas after the confluence of the circulating air and the fresh air.

[0215] As shown in FIG. 11, the drying method further includes, after the air pressure adjustment step:

[0216] S2000, a wind speed adjustment step: when the wind speed value detected by the wind box inlet speed measuring device is not in the preset wind speed value range, adjusting the circulating fan so that the wind speed value detected by the wind box inlet speed measuring device is in the preset wind speed value range.

[0217] The wind box inlet speed measuring device 370 can adopt a remote anemometer to detect the wind speed value of the gas after the confluence of the circulating air and the fresh air. The circulating air and the fresh air blow towards the drying area 20 immediately after confluence. Therefore, by making the wind speed value detected by the wind box inlet speed measuring device 370 in the preset wind speed value range, the wind speed of the gas sent to the drying area 20 is appropriate, thereby improving the uniformity of the wind speed blowing towards the electrode sheet 100, and further improving the quality of the electrode sheet.

[0218] In some embodiments of the present disclosure, an NMP concentration measuring device 325 is arranged at the exhaust port of each oven, and the NMP concentration measuring device 325 is used to detect the partial NMP concentration value passing through the exhaust port 3112.

[0219] As shown in FIG. 12, the drying method further includes, after the wind speed adjustment step:

[0220] S3000, concentration adjusting step: taking the oven whose sub-NMP concentration value measured by the NMP concentration measuring device is not in the preset sub-NMP concentration value interval as a concentration to be adjusted oven, in the case that there is at least one concentration to be adjusted oven, adjusting the output power of the circulating fan and the opening degree of the fresh air damper and the exhaust air damper of the concentration to be adjusted oven, so that the sub-NMP concentration value of the concentration to be adjusted oven is in the preset sub-NMP concentration value interval.

[0221] In the case that at least one oven 31 has a sub-NMP concentration value not in the preset sub-NMP concentration value interval, the sub-NMP concentration value can be changed by adjusting the output power of the circulating fan 318, the amount of fresh air entering the concentration to be adjusted oven and the amount of exhaust air after the drying operation can be changed by adjusting the opening degree of the fresh air damper 320 and the exhaust air damper 323 of the concentration to be adjusted oven, and the sub-NMP concentration value can also be changed. The output power of the circulating fan 318 is linked to the opening degree of the fresh air damper 320 and the exhaust air damper 323 in the embodiments of the present disclosure, and by cooperating with the adjustment, the sub-NMP concentration value of the concentration to be adjusted oven is in the preset sub-NMP concentration value interval, so that the sub-NMP concentration value of each oven 31 quickly reaches the condition that each oven 31 is in the preset sub-NMP concentration value interval. Therefore, the embodiments of the present disclosure improve the uniformity of the drying effect and improve the quality of the electrode sheet, and the adjustment efficiency is high.

[0222] In some embodiments of the present disclosure, a fresh air fan 319 is arranged at the fresh air port 3111 of each oven 31, and the fresh air fan 319 is used to adjust the air speed of the fresh air port 3111. An exhaust air fan 322 is arranged at the exhaust air port 3112 of each oven 31, and the exhaust air fan 322 is used to adjust the air speed of the exhaust air port 3112.

[0223] In the air pressure adjusting step, the output power of the fresh air fan 319 and the exhaust air fan 322 of the air pressure to be adjusted oven is also adjusted.

[0224] In the concentration adjusting step, the output power of the fresh air fan 319 and the exhaust air fan 322 of the concentration to be adjusted oven is also adjusted.

[0225] By cooperating to adjust the output power of the fresh air fan 319 and the exhaust air fan 322, the air volume of the fresh air in the oven 31 can be changed, so that the sub-NMP concentration value of the oven 31 is changed. Moreover, by cooperating to adjust the output power of the fresh air fan 319 and the exhaust air fan 322, the total air volume in the oven 31 can also be changed, so that the sub-air pressure value of the oven 31 is changed.

[0226] In some embodiments of the present disclosure, a heat exchange device 350 is arranged in each oven 31, and the heat exchange device 350 is used to heat the temperature of the gas after the circulating air and the fresh air are converged.

[0227] In the concentration adjusting step, the heating temperature of the heat exchange device 350 of the concentration-adjusted oven is also adjusted.

[0228] The heat exchange device 350 is used to heat the temperature of the gas after the confluence of the circulating air and the fresh air, so as to increase the temperature of the gas blown to the drying area 20, thereby achieving the drying of the electrode sheet 100. The higher the drying temperature of the electrode sheet 100, the faster the NMP is generated, which will make the NMP concentration value higher. Therefore, by changing the heating temperature of the heat exchange device 350, the NMP concentration value can be affected, so that the NMP concentration value is in the preset NMP concentration value interval.

[0229] In some embodiments of the present disclosure, in the concentration adjusting step, the output power of the total fresh air fan 331 and / or the total exhaust air fan 341 is also adjusted.

[0230] In this way, on the basis of adjusting the circulating fan 318, the fresh air damper 320, the exhaust air damper 323, the fresh air fan 319, the exhaust air fan 322 and the heat exchange device 350, the output power of the total fresh air fan 331 and / or the total exhaust air fan 341 is also adjusted, which can accelerate the adjustment rate of the NMP concentration value.

[0231] In some embodiments of the present disclosure, the exhaust air main pipe is provided with a total exhaust air NMP concentration measuring device 343, which is used to detect the total NMP concentration value of the gas passing through the exhaust air main pipe 34.

[0232] As shown in FIG. 13, the concentration adjusting step includes:

[0233] S301, total concentration adjusting step: in the case that there is at least one concentration-adjusted oven and the total NMP concentration value is not in the preset total NMP concentration value interval, the output power of the circulating fan of the concentration-adjusted oven and the heating temperature of the heat exchange device are adjusted, so that the total NMP concentration value is in the preset total NMP concentration value interval.

[0234] S302, sub-concentration adjusting step, the output power of the fresh air fan and the exhaust air fan of the concentration-adjusted oven, the opening of the fresh air damper and the exhaust air damper and the heating temperature of the heat exchange device are adjusted, so that the NMP concentration value of the concentration-adjusted oven is in the preset NMP concentration value interval.

[0235] In this way, the total NMP concentration value is first brought into the preset total NMP concentration value interval, so that multiple concentration-adjusted ovens can be adjusted at the same time, which is beneficial to improve the adjustment efficiency. Then, the NMP concentration value of the concentration-adjusted oven is brought into the preset NMP concentration value interval, so that the NMP concentration value of each oven 31 is in the preset NMP concentration value interval. First, the adjustment is roughly adjusted, and then the adjustment is finely adjusted. Not only the adjustment efficiency is improved, but also the adjustment accuracy is improved, which is more conducive to improving the quality of the electrode sheet.

[0236] In some embodiments of the present disclosure, the exhaust air main pipe 34 is provided with a total pressure detection device 344 for detecting the total air pressure value in the exhaust air main pipe 34.

[0237] As shown in FIG. 14, the air pressure adjustment step includes:

[0238] S101, a total air pressure adjustment step, in the case that there is at least one air pressure oven to be adjusted and the total air pressure value is not in the preset total negative pressure value range, adjusting the output power of the total fresh air fan and the total exhaust air fan so that the total air pressure value is in the preset total negative pressure value range.

[0239] S102, a partial air pressure adjustment step, adjusting the output power of the fresh air fan and the exhaust air fan of the air pressure oven to be adjusted and the opening degree of the fresh air damper and the exhaust air damper so that the partial air pressure value is in the preset partial negative pressure value range.

[0240] In this way, the total air pressure value is first brought into the preset total negative pressure value range, which can affect the partial air pressure values of multiple air pressure ovens to be adjusted, which is beneficial to improve the adjustment efficiency, and then the partial air pressure value of the air pressure oven to be adjusted is brought into the preset partial negative pressure value range, so that the partial air pressure value of each oven 31 is in the preset partial negative pressure value range, which is first coarsely adjusted and then finely adjusted, which not only improves the adjustment efficiency but also improves the adjustment accuracy, thereby more beneficial to improve the quality of the electrode plate.

[0241] In some embodiments of the present disclosure, the drying area of each oven is provided with a visual detection device 327 for detecting the appearance of the electrode plate 100 passing through the drying area 20.

[0242] As shown in FIG. 15, the drying method further includes:

[0243] S4000, a visual feedback step: in the case that the appearance detected by the visual detection device does not meet the preset appearance reference standard, performing the air pressure adjustment step, and / or the air speed adjustment step, and / or the concentration adjustment step.

[0244] The visual detection device 327 can monitor the appearance of the electrode plate 100 inside the drying area 20 online, and when the appearance of the electrode plate 100 is abnormal, the drying data is corrected in time by controlling the air speed, negative pressure or NMP concentration, etc., thereby improving the coating drying quality and efficiency.

[0245] In some embodiments of the present disclosure, as shown in FIG. 16, the drying method further includes:

[0246] S5000, in the case that the drying process of a batch of electrode plates is completed, obtaining the final drying parameters.

[0247] The final drying parameters include final output power of the total fresh air fan and the total exhaust air fan, and final opening degrees of the fresh air damper and the exhaust air damper of the air pressure drying oven to be adjusted; when the drying process of the next batch of pole pieces starts, the drying device adjusts the next batch of pole pieces according to the final drying parameters.

[0248] In this way, after the first batch of pole pieces 100 is debugged, the drying device can obtain stable final drying parameters, and then the final drying parameters can be directly applied to the next batch of pole pieces 100. Based on this, the drying process for the same pole pieces 100 can be completed through one-time debugging, thereby avoiding the technical problem that in the prior art, the drying equipment needs to be adjusted after the drying condition is observed by manual observation every time the pole pieces 100 are dried, and thus the labor cost and the scrap cost of the pole pieces are reduced.

[0249] The fourth aspect of the application provides a drying method applied to a drying system. Referring to FIGS. 1 and 9, the drying system includes a drying device 1 and a control device 2. The drying device 1 includes a first drying device 3a and a second drying device 3b formed by the drying device 3 provided in the first aspect. The control device 2 is used to control the drying device 1 to perform drying work.

[0250] The first NMP concentration value in the following content corresponds to the total NMP concentration value in the above content, and the first preset NMP concentration value interval in the following content corresponds to the preset total NMP concentration value interval in the above content. The second NMP concentration value in the following content corresponds to the NMP concentration value in the above content, and the second preset NMP concentration value interval in the following content corresponds to the preset NMP concentration value interval in the above content. The first negative pressure value in the following content corresponds to the total air pressure value in the above content, the first preset negative pressure value interval in the following content corresponds to the preset total negative pressure value interval in the above content, the second negative pressure value in the following content corresponds to the air pressure value in the above content, and the second preset negative pressure value interval in the following content corresponds to the preset negative pressure value interval in the above content.

[0251] Referring to FIG. 17, the drying method includes the following steps S1001 to S1003:

[0252] In step S1001, the drying device adjusts the pole pieces according to the initial drying parameters.

[0253] In the embodiment of the present disclosure, the drying device 1 adjusts the pole pieces according to the initial drying parameters.

[0254] In the embodiment of the present disclosure, the initial drying parameters can be preset for the drying device, or can be the drying parameters used by the drying device when the last time the drying was performed on other pole pieces. The specific initial drying parameters can be set according to actual conditions, which are not specifically limited in the embodiment of the present disclosure.

[0255] In the embodiments of the present disclosure, the drying parameters at least include a first parameter for controlling negative pressure, a second parameter for controlling air speed, and a third parameter for controlling NMP concentration value in the drying device 1. The specific drying parameters can be determined according to actual conditions, which are not specifically limited in the embodiments of the present disclosure.

[0256] In step S1002, the control device acquires drying data of the pole piece in the drying process every preset time period when the drying process for the pole piece starts.

[0257] In the embodiments of the present disclosure, the control device 2 acquires drying data of the pole piece in the drying process every preset time period when the drying process for the pole piece starts.

[0258] In the embodiments of the present disclosure, the drying data generally includes NMP concentration value in the drying device 1, negative pressure value in the drying device 1, air speed value in the drying device 1, and appearance data of the pole piece after the drying process is completed, etc. The specific drying data can be determined according to actual conditions, which are not specifically limited in the embodiments of the present disclosure.

[0259] For example, the control device 2 can acquire the drying data of the pole piece in the drying process every 1 second or every 1 minute, so as to adjust the initial drying parameters by using the drying data until the drying process is completed.

[0260] In step S1003, the control device adjusts the initial drying parameters when the drying data does not meet the preset data reference benchmark until the drying process is completed.

[0261] In the embodiments of the present disclosure, the control device 2 judges the drying data after acquiring the drying data, and adjusts the initial drying parameters when the drying data does not meet the preset data reference benchmark until the drying process is completed.

[0262] In the embodiments of the present disclosure, the corresponding preset data reference benchmark can be set for different drying data, and the control device 2 adjusts the initial drying parameters of the current drying device 1 when the acquired drying data does not meet the corresponding preset data reference benchmark, that is, the initial drying parameters can be adjusted once according to the acquired drying data every preset time, and a stable final drying parameter is obtained through continuous adjustment, and then the final drying parameter can be used to perform the drying process for the same pole piece.

[0263] It can be understood that the present disclosure can be manually or automatically switched when adjusting the drying parameters. When starting for the first time, the initial drying parameters are input as the basic value, and then the automatic closed-loop control is switched, that is, the initial drying parameters are automatically adjusted by using the drying data.

[0264] In some embodiments of the present disclosure, the drying data at least includes a current negative pressure value, a current air speed value and a current NMP concentration value; the drying parameters at least include a first parameter for controlling the negative pressure, a second parameter for controlling the air speed and a third parameter for controlling the NMP concentration value; the control device 2 adjusts the initial drying parameters when the drying data does not meet the preset data reference benchmark, and the specific method includes the following steps S1101 to S1103 with reference to FIG. 18:

[0265] In step S1101, the control device adjusts the first parameter when the current negative pressure value is not in the preset negative pressure value interval, so as to make the current negative pressure value in the preset negative pressure value interval.

[0266] In the embodiments of the present disclosure, the control device 2 adjusts the first parameter when the current negative pressure value is not in the preset negative pressure value interval, so as to make the current negative pressure value in the preset negative pressure value interval.

[0267] In the embodiments of the present disclosure, with reference to FIGS. 3, 4 and 9, the drying equipment 1 includes at least two drying devices 3, each drying device 3 includes at least two ovens 31 and an exhaust air main pipe 34, the exhaust air main pipe 34 is provided with a total pressure detection device 344, each oven 31 includes an oven body 311, the oven body 311 is provided with an air pressure detection device 326 for detecting the air pressure in the oven body 311, thereby the current negative pressure value at least includes a total negative pressure value corresponding to one of the drying devices 3 in the drying equipment 1, i.e. a first negative pressure value obtained from the total pressure detection device 344, and a single negative pressure value corresponding to the oven body 311 of each oven 31, i.e. a second negative pressure value obtained from the air pressure detection device 326, the control device 2 adjusts the first parameter for controlling the negative pressure of the drying equipment 1 when the first negative pressure value corresponding to the drying device 3 and the second negative pressure value corresponding to the oven body 311 of each oven 31 are not in the preset negative pressure value interval, so as to adjust the first negative pressure value and the second negative pressure value to be in the preset negative pressure value interval.

[0268] In step S1102, the control device adjusts the second parameter when the current air speed value is not in the preset air speed value interval, so as to make the current air speed value in the preset air speed value interval.

[0269] In the embodiments of the present disclosure, the control device 2 adjusts the second parameter when the current air speed value is not in the preset air speed value interval, so as to make the current air speed value in the preset air speed value interval.

[0270] In the embodiments of the present disclosure, referring to FIGS. 3, 4 and 9, the drying equipment 1 comprises at least two drying devices 3, each drying device 3 comprises at least two ovens 31, each oven 31 comprises an oven body 311 and a first air bellow 312 arranged in the oven body 311, the first air bellow 312 has a first bellow wall 3121, an outer side of the first bellow wall 3121 is provided with a drying area 20 for the passage of the pole piece 100, and the oven 31 is provided with an air bellow inlet speed measuring device 370, so that the current air speed value is the air speed value of the gas after the circulating air and fresh air of each oven 31 are converged, that is, the control equipment 2 adjusts the second parameter for controlling the air speed in the drying equipment 1 when the current air speed value measured by the air bellow inlet speed measuring device 370 of each oven 31 in the drying device 3 is not in the preset air speed value interval, so as to adjust the current air speed value to be in the preset air speed value interval.

[0271] In step S1103, the control equipment adjusts the third parameter when the current NMP concentration value is not in the preset NMP concentration value interval, so as to make the current NMP concentration value be in the preset NMP concentration value interval.

[0272] In the embodiments of the present disclosure, the control equipment 2 adjusts the third parameter when the current NMP concentration value is not in the preset NMP concentration value interval, so as to make the current NMP concentration value be in the preset NMP concentration value interval.

[0273] In the embodiments of the present disclosure, the preset negative pressure value interval, the preset air speed value interval and the preset NMP concentration value interval are preset for the drying equipment.

[0274] For example, referring to FIG. 19, an exemplary drying process is given for illustrating steps S1101 to S1103, which specifically comprises steps S1201 to S1204.

[0275] In step S1201, the initial drying parameters are set before the heating of the drying equipment is started, and the heating of the drying equipment is started after the initial drying parameters are set, and the coating is prepared.

[0276] In the embodiments of the present disclosure, the initial drying parameters at least comprise a first fresh air fan frequency of a total fresh air fan, a first exhaust air fan frequency of a total exhaust air fan, a first fresh air damper opening degree of the total fresh air fan, a first exhaust air damper opening degree of the total exhaust air fan, an initial NMP concentration value setting value of each oven, a second fresh air fan frequency of a fresh air fan of each oven, a first opening degree of a fresh air damper, a second exhaust air fan frequency of an exhaust air fan, a second opening degree of an exhaust air damper, a heating temperature of a heat exchange device, an output power of a frequency converter in a circulating fan, etc.; the specific initial drying parameters can be determined according to the actual situation, which is not specifically limited in the embodiments of the present disclosure.

[0277] Step S1202, in a case where the current negative pressure value is not in the preset negative pressure value interval, adjusting the first exhaust air damper opening degree of the total exhaust air fan and / or the first fresh air damper opening degree of the total fresh air fan, so as to adjust the current negative pressure value into the preset negative pressure value interval.

[0278] In the embodiment of the present disclosure, the current negative pressure value at least includes a first negative pressure value corresponding to one drying device in the drying equipment 1, and a second negative pressure value corresponding to the box body of each drying oven in the drying device. Therefore, the control device 2 acquires the first negative pressure value from the total pressure detection device of the drying equipment 1 every preset time period, and if the first negative pressure value is not in the first preset negative pressure value interval, the first exhaust air damper opening degree of the total exhaust air fan and / or the first fresh air damper opening degree of the total fresh air fan can be adjusted, so as to adjust the first negative pressure value into the first preset negative pressure value interval. Then, the control device 2 acquires the second negative pressure value corresponding to the box body of each drying oven from the air pressure detection device of each drying oven in the drying device, and if the second negative pressure value is not in the second preset negative pressure value interval, the second fresh air frequency of the fresh air fan of each drying oven, the first opening degree of the fresh air damper, the second exhaust air frequency of the exhaust air fan, and the second opening degree of the exhaust air damper can be selectively adjusted, so as to adjust the second negative pressure value into the second preset negative pressure value interval. The specific adjustment mode can be determined according to actual conditions, which is not specifically limited in the embodiment of the present disclosure.

[0279] Step S1203, in a case where the current wind speed value is not in the preset wind speed value interval, adjusting the output power of the frequency converter in the circulating fan, so as to adjust the current wind speed value into the preset wind speed value interval.

[0280] In the embodiment of the present disclosure, after the control device 2 adjusts the current negative pressure value into the preset negative pressure value interval, the control device 2 acquires the current wind speed value of the gas after the circulating air and the fresh air of the current drying oven are converged from the air inlet speed detection device of the air box of each drying oven in the drying device of the drying equipment 1, and if the current wind speed value is not in the preset wind speed value interval, the output power of the frequency converter in the circulating fan can be adjusted, so as to adjust the current wind speed value into the preset wind speed value interval. The specific adjustment mode can be determined according to actual conditions, which is not specifically limited in the embodiment of the present disclosure.

[0281] Step S1204, in a case where the current NMP concentration value is not in the preset NMP concentration value interval, adjusting the first fresh air damper opening degree of the total fresh air fan and / or the first fresh air frequency, so as to adjust the current NMP concentration value into the preset NMP concentration value interval.

[0282] In the embodiments of the present disclosure, the current NMP concentration value at least includes a first NMP concentration value obtained from the total exhaust NMP concentration measuring device of the drying device of the drying equipment 1 and a second NMP concentration value obtained from the NMP concentration measuring device of each oven of the drying device. Therefore, after the current air speed value is adjusted to the preset air speed value range, the control device 2 first obtains the first NMP concentration value from the total exhaust NMP concentration measuring device of the drying device of the drying equipment 1. If the first NMP concentration value is not in the first preset NMP concentration value range, the first fresh air damper opening degree of the total fresh air fan and / or the first fresh air frequency can be adjusted to adjust the first NMP concentration value to the first preset NMP concentration value range. Then, the second NMP concentration value is obtained from the NMP concentration measuring device of each oven of the drying device. If the second NMP concentration value is not in the second preset NMP concentration value range, the second fresh air frequency of the fresh air fan of each oven, the first opening degree of the fresh air damper, the second exhaust air frequency of the exhaust air fan, the second opening degree of the exhaust air damper, or the heating temperature of the heat exchange device can be adjusted to adjust the second NMP concentration value to the second preset NMP concentration value range. The specific adjustment mode can be determined according to the actual situation, which is not limited in the embodiments of the present disclosure.

[0283] In the embodiments of the present disclosure, referring to FIGS. 2, 3 and 4, the drying equipment 1 includes at least two drying devices 3, and each drying device 3 includes at least two ovens 31 and an exhaust air main pipe 34. In the same drying device 3, the exhaust ports 3112 of all the ovens 31 are respectively connected to the exhaust air main pipe 34 through pipelines, and the exhaust air main pipe 34 is provided with a total exhaust NMP concentration measuring device 343. Meanwhile, each oven 31 includes an oven body 311 provided with an exhaust port 3112 communicating with a return air passage for exhausting part of the gas in the return air passage, and the oven body 311 is provided with an NMP concentration measuring device 325 at the exhaust port 3112. Therefore, the current NMP concentration value at least includes the overall exhaust NMP concentration value corresponding to one drying device 3 of the drying equipment 1, i.e., the first NMP concentration value obtained from the total exhaust NMP concentration measuring device 343, and the individual NMP concentration value of the exhaust of the oven body 311 of each oven 31, i.e., the second NMP concentration value obtained from the NMP concentration measuring device 325. In the case that the first NMP concentration value corresponding to the drying device 3 and the second NMP concentration value corresponding to the oven body 311 of each oven 31 are not in the preset NMP concentration value range, the control device 2 adjusts the third parameter for controlling the NMP concentration value of the drying equipment 1 to adjust the first NMP concentration value and the second NMP concentration value to the preset NMP concentration value range.

[0284] Based on the above embodiments, in some embodiments of the present disclosure, referring to FIGS. 3 and 4, the drying equipment 1 comprises an oven 31 and an exhaust main pipe 34 provided with a total pressure detection device 344, and the oven 31 comprises an oven body 311; the inner wall of the oven body 311 is provided with an air pressure detection device 326, and the current negative pressure value at least comprises a first negative pressure value obtained from the total pressure detection device 344 and a second negative pressure value obtained from the air pressure detection device 326; the control equipment 2 adjusts the first parameter when the current negative pressure value is not in the preset negative pressure value interval, and referring to FIG. 20, the specific method comprises the following steps S1301 to S1303:

[0285] Step S1301, the control equipment adjusts the first sub-parameter when the first negative pressure value is not in the first preset negative pressure value interval.

[0286] In the embodiments of the present disclosure, the control equipment 2 adjusts the first sub-parameter when the first negative pressure value is not in the first preset negative pressure value interval.

[0287] In the embodiments of the present disclosure, since the current negative pressure value at least comprises the first negative pressure value obtained from the total pressure detection device 344 and the second negative pressure value obtained from the air pressure detection device 326, the control equipment 2 needs to first adjust the first sub-parameter affecting the first negative pressure value in the drying equipment 1 when the first negative pressure value corresponding to one drying device 3 in the drying equipment 1 is not in the first preset negative pressure value interval, so as to adjust the first negative pressure value to be in the first preset negative pressure value interval, and then judge the second negative pressure value.

[0288] Step S1302, the control equipment obtains the second negative pressure value after adjusting the first sub-parameter and the first negative pressure value being in the first preset negative pressure value interval.

[0289] In the embodiments of the present disclosure, the control equipment 2 obtains the second negative pressure value after adjusting the first sub-parameter and the first negative pressure value being in the first preset negative pressure value interval.

[0290] In the embodiments of the present disclosure, after adjusting the first sub-parameter affecting the first negative pressure value in the drying equipment 1, so as to adjust the first negative pressure value to be in the first preset negative pressure value interval, the control equipment 2 needs to obtain the second negative pressure value corresponding to the oven body 311 of each oven 31 from the air pressure detection device 326, and judge the second negative pressure value.

[0291] Step S1303, the control equipment adjusts the second sub-parameter when the second negative pressure value is not in the second preset negative pressure value interval.

[0292] In the embodiments of the present disclosure, the control equipment 2 adjusts the second sub-parameter when the second negative pressure value is not in the second preset negative pressure value interval.

[0293] In the embodiments of the present disclosure, after the control device 2 obtains the second negative pressure value corresponding to the box body 311 of each oven 31 from the air pressure detection device 326, if it is judged that the second negative pressure value is not in the second preset negative pressure value interval, the second sub-parameter affecting the second negative pressure value in the drying equipment 1 is adjusted to adjust the second negative pressure value to the second preset negative pressure value interval.

[0294] In the embodiments of the present disclosure, since the drying equipment 1 includes at least two drying devices 3, and the drying device 3 includes at least two ovens 31, and the first negative pressure value is the overall negative pressure value corresponding to one drying device 3 in the drying equipment 1, and the second negative pressure value is the individual negative pressure value corresponding to the box body 311 of each oven 31 in the drying device 3, when setting the first preset negative pressure value interval corresponding to the first negative pressure value of each drying device 3, the corresponding first preset negative pressure value interval can be set for different drying devices 3, and when setting the second preset negative pressure value interval corresponding to the second negative pressure value of the box body 311 of each oven 31, the corresponding second preset negative pressure value interval can be set for different ovens 31. When judging the current negative pressure value, the present disclosure can first judge the first negative pressure value for different drying devices 3, and then judge the second negative pressure value for each oven in each drying device 3. The specific judgment process can be selected according to the actual situation, which is not specifically limited in the embodiments of the present disclosure.

[0295] In some embodiments of the present disclosure, referring to FIG. 3, the drying device 3 further includes a fresh air main pipe 33, and the fresh air main pipe 33 is provided with a total fresh air fan 331, and the exhaust air main pipe 34 is further provided with a total exhaust air fan 341; the control device 2 adjusts the first sub-parameter, and the specific method includes the following steps S1401:

[0296] Step S1401, the control device performs a control algorithm PID operation based on the first negative pressure value and the first preset negative pressure value interval to obtain a first analog quantity, and adjusts the first fresh air frequency of the total fresh air fan and / or the first exhaust air frequency of the total exhaust air fan based on the first analog quantity.

[0297] In the embodiments of the present disclosure, the control device 2 performs a control algorithm PID operation based on the first negative pressure value and the first preset negative pressure value interval to obtain a first analog quantity, and adjusts the first fresh air frequency of the total fresh air fan 331 and / or the first exhaust air frequency of the total exhaust air fan 341 based on the first analog quantity.

[0298] In the embodiments of the present disclosure, the first sub-parameter at least includes the first fresh air fan frequency of the total fresh air fan 331 and the first exhaust air fan frequency of the total exhaust air fan 341; thus, the control device 2 can adjust the first fresh air fan frequency of the total fresh air fan 331, or the first exhaust air fan frequency of the total exhaust air fan, or simultaneously adjust the first fresh air fan frequency of the total fresh air fan 331 and the first exhaust air fan frequency of the total exhaust air fan, as long as the exhaust air speed is slightly larger than the fresh air speed, as long as the first negative pressure value corresponding to one drying device 3 in the drying equipment 1 is not in the first preset negative pressure value interval. The specific adjustment mode can be selected according to the actual situation, and the embodiments of the present disclosure do not make specific limitations here.

[0299] In some embodiments of the present disclosure, referring to FIG. 4, the cabinet 311 is provided with a fresh air port 3111 and an exhaust air port 3112, and the control device 2 adjusts the second sub-parameter. Referring to FIG. 22, the specific method includes the following steps S1501:

[0300] In step S1501, the control device performs PID operation based on the second negative pressure value and the second preset negative pressure value interval to obtain a second analog quantity, and adjusts the fresh air amount of the fresh air port and / or the exhaust air amount of the exhaust air port based on the second analog quantity.

[0301] In the embodiments of the present disclosure, the control device 2 performs PID operation based on the second negative pressure value and the second preset negative pressure value interval to obtain a second analog quantity, and adjusts the fresh air amount of the fresh air port 3111 and / or the exhaust air amount of the exhaust air port 3112 based on the second analog quantity.

[0302] In the embodiments of the present disclosure, the second sub-parameter at least includes the fresh air amount of the fresh air port 3111 and the exhaust air amount of the exhaust air port 3112; thus, the control device 2 can adjust the fresh air amount of the fresh air port, or the exhaust air amount of the exhaust air port, or simultaneously adjust the fresh air amount of the fresh air port and the exhaust air amount of the exhaust air port, as long as the exhaust air speed is slightly larger than the fresh air speed to maintain the negative pressure, as long as the second negative pressure value corresponding to the cabinet 311 of the drying cabinet 31 is not in the second preset negative pressure value interval. The specific adjustment mode can be selected according to the actual situation, and the embodiments of the present disclosure do not make specific limitations here.

[0303] For example, referring to FIGS. 23, 24 and 25, an exemplary adjustment process of the first parameter is given to illustrate steps S1301 to S1501, which specifically includes steps S1601 to S1807:

[0304] It is assumed that the first preset negative pressure value interval corresponding to the drying device 3 is [-35pa, -15pa], and at the same time, it is assumed that the drying device 3 includes 12 ovens 31, and the second preset negative pressure value interval corresponding to the box body 311 of each oven 31 is [-45pa, -5pa], and the first oven 31 and the last oven 31 are provided with a third preset negative pressure value interval of [-25pa, -5pa].

[0305] Step S1601, obtain the first negative pressure value from the total pressure detection device.

[0306] Step S1602, determine whether the first negative pressure value is less than -35pa.

[0307] Specifically, if the first negative pressure value is less than -35pa, proceed to step S1603, and if the first negative pressure value is not less than -35pa, proceed to step 1604.

[0308] Step S1603, reduce the first exhaust fan frequency of the total exhaust fan.

[0309] Step S1604, determine whether the first negative pressure value is greater than -15pa.

[0310] Specifically, if the first negative pressure value is greater than -15pa, proceed to step S1605, and if the first negative pressure value is not greater than -15pa, proceed to step S1607.

[0311] Step S1605, increase the first exhaust fan frequency of the total exhaust fan.

[0312] Step S1606, obtain the first negative pressure value again from the total pressure detection device, and determine whether the first negative pressure value is greater than -35pa and less than -15pa.

[0313] Specifically, if the first negative pressure value is -25pa, i.e. greater than -35pa and less than -15pa, proceed to step S1607, and if the first negative pressure value does not satisfy greater than -35pa and less than -15pa, proceed to step S1602 again.

[0314] Step S1607, the first negative pressure value adjustment closed loop ends.

[0315] Specifically, the first negative pressure value adjustment closed loop ends, and the second negative pressure value adjustment closed loop begins, and proceeds to step S1701.

[0316] Step S1701, for each oven, obtain the second negative pressure value corresponding to the box body of each oven from the air pressure detection device of each oven.

[0317] Step S1702, determine whether the second negative pressure value is less than -45pa.

[0318] Specifically, if the second negative pressure value is less than -45 pa, then step S1703 is entered, and if the second negative pressure value is not less than -45 pa, then step S1704 is entered.

[0319] Step S1703: reducing the second exhaust fan frequency of the exhaust fan of the section oven.

[0320] Step S1704: determining whether the second negative pressure value is greater than -5 pa.

[0321] Specifically, if the second negative pressure value is greater than -5 pa, then step S1705 is entered, and if the second negative pressure value is not greater than -5 pa, then step S1707 is entered.

[0322] Step S1705: increasing the second exhaust fan frequency of the exhaust fan of the section oven.

[0323] Step S1706: again obtaining the second negative pressure value from the air pressure detection device of the section oven, and determining whether the second negative pressure value is greater than -45 pa and less than -5 pa.

[0324] Specifically, if the second negative pressure value is -25 pa, i.e., greater than -45 pa and less than -5 pa, then step S1707 is entered, and if the second negative pressure value does not satisfy the condition of being greater than -45 pa and less than -5 pa, then step S1702 is entered again.

[0325] Step S1707: the second negative pressure value adjustment closed loop ends.

[0326] Specifically, the second negative pressure value adjustment closed loop ends, and the third negative pressure value adjustment closed loop starts, and step S1801 is entered.

[0327] Step S1801: again obtaining the third negative pressure value from the first section oven / tail section oven.

[0328] Step S1802: determining whether the third negative pressure value is less than -25 pa.

[0329] Specifically, if the third negative pressure value is less than -25 pa, then step S1803 is entered, and if the third negative pressure value is not less than -25 pa, then step S1804 is entered.

[0330] Step S1803: reducing the second exhaust fan frequency of the exhaust fan of the first section oven / tail section oven.

[0331] Step S1804: determining whether the third negative pressure value is greater than -5 pa.

[0332] Specifically, if the third negative pressure value is greater than -5 pa, then step S1805 is entered, and if the third negative pressure value is not greater than -5 pa, then step S1807 is entered.

[0333] Step S1805, increase the second exhaust fan frequency of the first oven / tail oven.

[0334] Step S1806, obtain a third negative pressure value from the air pressure detection device of the first oven / tail oven again, and determine whether the third negative pressure value is greater than -25 pa and less than -5 pa.

[0335] Specifically, if the third negative pressure value is -15 pa, i.e., greater than -25 pa and less than -5 pa, step S1807 is entered, and if the third negative pressure value does not satisfy greater than -25 pa and less than -5 pa, step S1802 is entered again.

[0336] Step S1807, the negative pressure regulation closed loop is ended.

[0337] In some embodiments of the present disclosure, referring to FIGS. 4 and 6, the oven 31 further comprises a first air bellow 312 and a circulating fan 318 arranged in the oven body 311, and the oven 31 is provided with an air bellow inlet speed detection device 370, and the current air speed value is obtained from the air bellow inlet speed detection device 370; the control device 2 adjusts the second parameter, and a specific method comprises the following steps S1901, referring to FIG. 26:

[0338] Step S1901, the control device adjusts the output power of the frequency converter in the circulating fan.

[0339] In the embodiments of the present disclosure, the control device 2 adjusts the output power of the frequency converter in the circulating fan 318.

[0340] In the embodiments of the present disclosure, the second parameter at least comprises the output power of the frequency converter in the circulating fan 318, and thus, the control device 2 adjusts the output power of the frequency converter in the circulating fan 318 to adjust the current air speed value to the preset air speed value interval in the case that the current air speed value of the gas blown to the pole piece in the first air bellow 312 of each oven 31 in the drying device 3 is not in the preset air speed value interval.

[0341] For example, referring to FIG. 27, an exemplary adjustment process of the second parameter is given, which is used to illustrate step S1901, and specifically comprises steps S2001 to S2006:

[0342] Step S2001, set the preset air speed value interval of each oven.

[0343] Step S2002, obtain the current air speed value of the oven from the air bellow inlet speed detection device of the oven.

[0344] Step S2003, determine whether the current air speed value is in the preset air speed value interval.

[0345] Specifically, if the preset air speed value of the section oven is set as V1, and the current air speed value is V2, it is judged whether the absolute value of V1-V2 is greater than 0.1. If yes, it indicates that the current air speed value is not in the preset air speed value interval, and step S2004 is entered. If no, it indicates that the current air speed value is in the preset air speed value interval, and step S2006 is entered.

[0346] Step S2004: The output power of the frequency converter in the circulating fan is adjusted.

[0347] Specifically, a closed-loop control (Proportion Integral Differential, PID) operation is performed, and the output power of the frequency converter in the circulating fan is adjusted to adjust the current air speed value.

[0348] Step S2005: The current air speed value is obtained again from the air inlet speed measuring device of the air bellow of the section oven, and it is judged whether the current air speed value is in the preset air speed value interval.

[0349] Specifically, if the current air speed value is not in the preset air speed value interval, step S2004 is re-entered. If the current air speed value is in the preset air speed value interval, step S2006 is entered.

[0350] Step S2006: The output power of the frequency converter in the circulating fan is maintained, and the air speed adjustment closed loop is ended.

[0351] In some embodiments of the present disclosure, referring to FIGS. 2, 3 and 4, the total exhaust air pipe 34 in the drying device 3 of the drying equipment 1 is provided with a total exhaust NMP concentration measuring device 343, the box body 311 of the oven 31 in the drying device 3 is provided with an exhaust port 3112, the exhaust port 3112 is provided with an NMP concentration measuring device 325, the current NMP concentration value at least includes a first NMP concentration value obtained from the total exhaust NMP concentration measuring device 343 and a second NMP concentration value obtained from the NMP concentration measuring device 325; the control equipment 2 adjusts the third parameter when the current NMP concentration value is not in the preset NMP concentration value interval, referring to FIG. 28, the specific method includes the following steps S2101 to S2103:

[0352] Step S2101: The control equipment adjusts the third sub-parameter when the first NMP concentration value is not in the first preset NMP concentration value interval.

[0353] In the embodiments of the present disclosure, the control equipment 2 adjusts the third sub-parameter when the first NMP concentration value is not in the first preset NMP concentration value interval.

[0354] In the embodiments of the present disclosure, since the current negative pressure value at least includes the first NMP concentration value obtained from the total exhaust NMP concentration measuring device 343 and the second NMP concentration value obtained from the NMP concentration measuring device 325, the control device 2 needs to first adjust the third sub-parameter affecting the first NMP concentration value in the drying device 1 corresponding to the first NMP concentration value not in the first preset NMP concentration value range, so as to adjust the first NMP concentration value into the first preset NMP concentration value range, and then judge the second NMP concentration value.

[0355] In step S2102, the control device obtains the second NMP concentration value after adjusting the third sub-parameter and the first NMP concentration value being in the first preset NMP concentration value range.

[0356] In the embodiments of the present disclosure, the control device 2 obtains the second NMP concentration value after adjusting the third sub-parameter and the first NMP concentration value being in the first preset NMP concentration value range.

[0357] In the embodiments of the present disclosure, after adjusting the third sub-parameter affecting the first NMP concentration value in the drying device 1, so as to adjust the first NMP concentration value into the first preset NMP concentration value range, the control device 2 needs to obtain the second NMP concentration value corresponding to the box body 311 of each oven 31 from the NMP concentration measuring device 325, and judge the second NMP concentration value.

[0358] In step S2103, the control device adjusts the fourth sub-parameter when the second NMP concentration value is not in the second preset NMP concentration value range.

[0359] In the embodiments of the present disclosure, the control device 2 adjusts the fourth sub-parameter when the second NMP concentration value is not in the second preset NMP concentration value range.

[0360] In the embodiments of the present disclosure, after the control device 2 obtains the second NMP concentration value corresponding to the box body 311 of each oven 31 from the NMP concentration measuring device 325, if it is judged that the second NMP concentration value is not in the second preset NMP concentration value range, the control device 2 adjusts the fourth sub-parameter affecting the second NMP concentration value in the drying device 1, so as to adjust the second NMP concentration value into the second preset NMP concentration value range.

[0361] In the embodiments of the present disclosure, since the drying device 1 comprises at least two drying apparatuses 3, and each drying apparatus 3 comprises at least two ovens 31, and the first NMP concentration value is the overall exhaust NMP concentration value corresponding to one drying apparatus 3 in the drying device 1, and the second NMP concentration value is the individual NMP concentration value corresponding to the box body 311 of each oven 31 in the drying apparatus 3, when the first preset NMP concentration value interval corresponding to the first NMP concentration value of each drying apparatus 3 is set, the corresponding first preset NMP concentration value interval can be set for different drying apparatuses 3, and when the second preset NMP concentration value interval corresponding to the second NMP concentration value of the box body 311 of each oven 31 is set, the corresponding second preset NMP concentration value interval can be set for different ovens 31. When the current NMP concentration value is judged, the first NMP concentration value can be judged for different drying apparatuses 3 first, and then the second NMP concentration value can be judged for each oven in each drying apparatus 3. The specific judgment process can be selected according to actual conditions, which is not specifically limited in the embodiments of the present disclosure.

[0362] In some embodiments of the present disclosure, referring to FIGS. 4 and 6, the box body 311 is provided with a first air bellow 312, a circulating fan 318 and a heat exchange device 350, and the heat exchange device 350 is used to heat the temperature of the gas after the circulating air and fresh air are converged. The control device 2 adjusts the third sub-parameter, and the specific method comprises the following step S2201, referring to FIG. 29:

[0363] Step S2201, the control device adjusts the output power of the frequency converter in the circulating fan and / or adjusts the heating temperature of the heat exchange device.

[0364] In the embodiments of the present disclosure, the control device 2 adjusts the output power of the frequency converter in the circulating fan 318 and / or adjusts the heating temperature of the heat exchange device 350.

[0365] In the embodiments of the present disclosure, the third sub-parameter at least comprises the output power of the frequency converter in the circulating fan 318 and the heating temperature of the heat exchange device 350. Therefore, when the first NMP concentration value corresponding to one drying apparatus 3 in the drying device 1 is not in the first preset NMP concentration value interval, the control device 2 can adjust the output power of the frequency converter in the circulating fan 318, can adjust the heating temperature of the heat exchange device 350, or can adjust the output power of the frequency converter in the circulating fan 318 and the heating temperature of the heat exchange device 350 at the same time. The specific adjustment mode can be selected according to actual conditions, which is not specifically limited in the embodiments of the present disclosure.

[0366] In some embodiments of the present disclosure, referring to FIG. 4, the box body 311 is further provided with a fresh air port 3111. The control device 2 adjusts the fourth sub-parameter, and the specific method comprises the following step S2301, referring to FIG. 30:

[0367] In step S2301, the control device performs PID operation based on the second NMP concentration value and the second preset NMP concentration value interval to obtain a third analog quantity, and adjusts the air inlet quantity of the fresh air outlet and / or the air outlet quantity of the exhaust air outlet based on the third analog quantity; and / or, the control device adjusts the heating temperature of the heat exchange device.

[0368] In the embodiments of the present disclosure, the control device 2 performs PID operation based on the second NMP concentration value and the second preset NMP concentration value interval to obtain a third analog quantity, and adjusts the air inlet quantity of the fresh air outlet 3111 and / or the air outlet quantity of the exhaust air outlet 3112 based on the third analog quantity; and / or, the control device 2 adjusts the heating temperature of the heat exchange device 350.

[0369] In the embodiments of the present disclosure, the fourth sub-parameter at least includes the air inlet quantity of the fresh air outlet 3111, the air outlet quantity of the exhaust air outlet 3112, and the heating temperature of the heat exchange device 350; therefore, the control device 2 can adjust the air inlet quantity of the fresh air outlet, or simultaneously adjust the air inlet quantity of the fresh air outlet 3111 and the air outlet quantity of the exhaust air outlet 3112 according to a preset proportion, or adjust the heating temperature of the heat exchange device 350, or adjust the heating temperature of the heat exchange device 350 while adjusting the air inlet quantity of the fresh air outlet, or simultaneously adjust the air inlet quantity of the fresh air outlet 3111, the air outlet quantity of the exhaust air outlet 3112, and the heating temperature of the heat exchange device 350 according to a preset proportion, when the second NMP concentration value corresponding to the cabinet 311 of the oven 31 is not in the second preset NMP concentration value interval. The specific adjustment mode can be selected according to the actual situation, which is not specifically limited in the embodiments of the present disclosure.

[0370] In some embodiments of the present disclosure, referring to FIG. 3 and FIG. 4, the fresh air outlet 3111 is provided with a fresh air fan 319 and a fresh air damper 320; the control device 2 adjusts the air inlet quantity of the fresh air outlet 3111, and the specific method includes the following step S2401:

[0371] In step S2401, the control device adjusts the second fresh air frequency of the fresh air fan and / or adjusts the first opening degree of the fresh air damper.

[0372] In the embodiments of the present disclosure, the control device 2 adjusts the second fresh air frequency of the fresh air fan 319 and / or adjusts the first opening degree of the fresh air damper 320.

[0373] In the embodiments of the present disclosure, when adjusting the air inlet quantity of the fresh air outlet 3111, the control device 2 can adjust the second fresh air fan frequency of the fresh air fan 319 to achieve the purpose of adjusting the air inlet quantity of the fresh air outlet 3111, can also adjust the first opening degree of the fresh air damper 320 to achieve the purpose of adjusting the air inlet quantity of the fresh air outlet 3111, and can also adjust the second fresh air fan frequency of the fresh air fan 319 and the first opening degree of the fresh air damper 320 at the same time to achieve the purpose of adjusting the air inlet quantity of the fresh air outlet 3111. The specific adjustment mode can be selected according to the actual situation, and the embodiments of the present disclosure do not make specific limitations here.

[0374] In some embodiments of the present disclosure, referring to FIGS. 3 and 4, the exhaust outlet 3112 is provided with an exhaust fan 322 and an exhaust damper 323; the control device 2 adjusts the exhaust quantity of the exhaust outlet 3112, and the specific method includes the following steps S2501, referring to FIG. 32:

[0375] Step S2501, the control device adjusts the second exhaust fan frequency of the exhaust fan and / or adjusts the second opening degree of the exhaust damper.

[0376] In the embodiments of the present disclosure, the control device 2 adjusts the second exhaust fan frequency of the exhaust fan 322 and / or adjusts the second opening degree of the exhaust damper 323.

[0377] In the embodiments of the present disclosure, when adjusting the exhaust quantity of the exhaust outlet 3112, the control device 2 can adjust the second exhaust fan frequency of the exhaust fan 322 to achieve the purpose of adjusting the exhaust quantity of the exhaust outlet 3112, can also adjust the second opening degree of the exhaust damper 323 to achieve the purpose of adjusting the exhaust quantity of the exhaust outlet 3112, and can also adjust the second exhaust fan frequency of the exhaust fan 322 and the second opening degree of the exhaust damper 323 at the same time to achieve the purpose of adjusting the exhaust quantity of the exhaust outlet 3112. The specific adjustment mode can be selected according to the actual situation, and the embodiments of the present disclosure do not make specific limitations here.

[0378] For example, referring to FIG. 33, an exemplary adjustment process of the fourth sub-parameter according to the second NMP concentration value is given, which is used to illustrate step S2103 and specifically includes steps S2601 to S2606:

[0379] Step S2601, set the second preset NMP concentration value interval of each section of the oven.

[0380] Step S2602, obtain the second NMP concentration value of the section of the oven from the NMP concentration measuring device of the section of the oven.

[0381] Step S2603, determine whether the second NMP concentration value is in the second preset NMP concentration value interval.

[0382] Step S2604, adjusting the air inlet quantity of the fresh air outlet and the air outlet quantity of the exhaust air outlet.

[0383] Specifically, the PID operation is performed to obtain an analog quantity, and the air inlet quantity of the fresh air outlet and the air outlet quantity of the exhaust air outlet of the second NMP concentration value of the second section oven 31 are adjusted based on the analog quantity to adjust the second NMP concentration value of the second section oven 31.

[0384] Step S2605, the second NMP concentration value of the second section oven is obtained again from the NMP concentration measuring device of the second section oven, and it is judged whether the second NMP concentration value is in the second preset NMP concentration value interval.

[0385] Specifically, if the second NMP concentration value is not in the second preset NMP concentration value interval, re-enter step S2604, and if the second NMP concentration value is in the second preset NMP concentration value interval, enter step S2606.

[0386] Step S2606, the air inlet quantity of the fresh air outlet and the air outlet quantity of the exhaust air outlet of the second section oven are kept, and the NMP concentration adjustment closed loop is ended.

[0387] For example, referring to FIGS. 34 and 35, an exemplary adjustment process of the third parameter is given, which is used to illustrate steps S2101 to S2501, and specifically includes steps S2701 to S2809:

[0388] Suppose the drying equipment 1 includes a first drying device 3 and a second drying device 3, and each of the first drying device 3 and the second drying device 3 includes 12 section ovens, the first preset NMP concentration value interval corresponding to each drying device 3 is [LEL 30%, LEL 35%], wherein LEL (lower explosive limit) is for NMP, and the second preset NMP concentration value interval set for the second section oven 31 to the tenth section oven 31 of each drying device 3 is [LEL 20%, LEL 40%], and the third preset NMP concentration value interval set for the last section oven 31 of each drying device 3 is [LEL 0%, LEL 5%].

[0389] Step S2701, obtaining the first NMP concentration value from the total exhaust NMP concentration measuring device.

[0390] Step S2702, judging whether the first NMP concentration value is greater than or equal to LEL 40%.

[0391] Specifically, if the first NMP concentration value is greater than or equal to LEL 40%, enter step S2703, and if the first NMP concentration value is less than LEL 40%, enter step S2705.

[0392] Step S2703, reducing the output power of the frequency converter in the circulating fan, and / or reducing the heating temperature of the heat exchange device.

[0393] Step S2704, obtaining the first NMP concentration value from the total exhaust NMP concentration measuring device again, and determining whether the first NMP concentration value is less than LEL 40%.

[0394] Specifically, if the first NMP concentration value is less than LEL 40%, step S2705 is entered, and if the first NMP concentration value is not less than LEL 40%, step S2703 is re-entered.

[0395] Step S2705, obtaining the second NMP concentration value corresponding to each oven from the NMP concentration measuring device of each oven.

[0396] Step S2706, determining whether there is an oven with a second NMP concentration value less than LEL 20%.

[0397] Specifically, if there is an oven with a second NMP concentration value less than LEL 20%, step S2707 is entered, and if there is no oven with a second NMP concentration value less than LEL 20%, step S2709 is entered.

[0398] Step S2707, increasing the second fresh air fan frequency of the fresh air fan of the oven, and / or increasing the heating temperature of the heat exchange device.

[0399] Step S2708, obtaining the second NMP concentration value from the NMP concentration measuring device of the oven again, and determining whether the second NMP concentration value is greater than or equal to LEL 20%.

[0400] Specifically, if the second NMP concentration value obtained again is greater than or equal to LEL 20%, step S2709 is entered, and if the second NMP concentration value obtained again is less than LEL 20%, step S2707 is re-entered.

[0401] Step S2709, the first stage NMP concentration value adjustment closed loop is ended.

[0402] Specifically, the first stage NMP concentration value adjustment closed loop is ended, the second stage NMP concentration value adjustment is started, and step S2801 is entered.

[0403] Step S2801, obtaining the first NMP concentration value from the total exhaust NMP concentration measuring device again.

[0404] Step S2802, determining whether the first NMP concentration value is greater than LEL 35%.

[0405] Specifically, if the first NMP concentration value is greater than LEL 35%, step S2803 is entered, and if the first NMP concentration value is not greater than LEL 35%, step S2804 is entered.

[0406] Step S2803, increasing the first fresh air damper opening of the total fresh air fan, and / or the first fresh air fan frequency.

[0407] Step S2804, determining whether the first NMP concentration value is less than LEL 30%.

[0408] Specifically, if the first NMP concentration value is less than LEL 30%, step S2805 is entered, and if the first NMP concentration value is not less than LEL 30%, step S2807 is entered.

[0409] Step S2805, reducing the first fresh air damper opening of the total fresh air fan, and / or the first fresh air fan frequency.

[0410] Step S2806, obtaining the second NMP concentration value from the total exhaust NMP concentration measuring device again, and determining whether the second NMP concentration value is greater than LEL 30% and less than LEL 35%.

[0411] Specifically, if the second NMP concentration value is greater than LEL 30% and less than LEL 35%, step S2807 is entered, and if the second NMP concentration value does not satisfy the condition of being greater than LEL 30% and less than LEL 35%, step S2805 is re-entered.

[0412] Step S2807, obtaining the third NMP concentration value of the last section of the oven, and determining whether the third NMP concentration value is greater than LEL 5%.

[0413] Specifically, if the third NMP concentration value is greater than LEL 5%, step S2808 is entered, and if the third NMP concentration value is not greater than LEL 5%, step S2809 is entered.

[0414] Step S2808, increasing the second fresh air fan frequency of the oven with the smallest second NMP concentration value among the second section oven to the tenth section oven, and / or increasing the heating temperature of the heat exchange device.

[0415] Step S2809, the second stage NMP concentration value adjustment closed loop ends.

[0416] For example, referring to FIG. 36, another exemplary adjustment process of the third parameter is given, which specifically includes steps S2901 to S2906:

[0417] Step S2901, obtaining the first section NMP concentration value of the first section oven in the drying device in the stable coating stage.

[0418] Step S2902, judge whether the first section NMP concentration value is less than LEL10%.

[0419] Specifically, if the first section NMP concentration value is less than LEL10%, enter step S2903, if the first section NMP concentration value is not less than LEL10%, enter step S2904.

[0420] Step S2903, increase the output power of the frequency converter in the circulating fan, and / or increase the heating temperature of the heat exchange device.

[0421] Step S2904, judge whether the overall NMP concentration value of each surface drying device is less than LEL35% and greater than LEL30%.

[0422] Specifically, if the overall NMP concentration is less than LEL35% and greater than LEL30%, enter step S2906, if the overall NMP concentration does not meet the condition of less than LEL35% and greater than LEL30%, enter step S2905.

[0423] Step S2905, fine-tune the first fresh air fan valve opening and / or the first fresh air fan frequency of the total fresh air fan.

[0424] Step S2906, the NMP concentration value adjustment in the coating stage is stable.

[0425] In some embodiments of the present disclosure, the drying data further includes a current temperature value, the drying parameter further includes a fourth parameter for controlling temperature, and the control device adjusts the initial drying parameter when the drying data does not meet the preset data reference benchmark. Referring to FIG. 37, the specific method includes the following step S3001:

[0426] Step S3001, the control device adjusts the fourth parameter when the current temperature value is not in the preset temperature value interval, so that the current temperature value is in the preset temperature value interval.

[0427] In the embodiments of the present disclosure, the control device 2 adjusts the fourth parameter when the current temperature value is not in the preset temperature value interval, so that the current temperature value is in the preset temperature value interval.

[0428] In the embodiments of the present disclosure, the control device 2 can adjust the fourth parameter for controlling temperature in the drying device 1 to increase the current temperature value when the current temperature value is less than the preset temperature value interval, or can adjust the fourth parameter for controlling temperature in the drying device 1 to decrease the current temperature value when the current temperature value is greater than the preset temperature value interval.

[0429] In some embodiments of the present disclosure, referring to FIG. 3, the return air passage is further provided with a return air temperature measuring device 330, the current temperature value is obtained from the return air temperature measuring device 330, and the heat exchange device 350 further comprises a heat conducting oil flow meter 351. The control device adjusts the fourth parameter. Referring to FIG. 38, the specific method comprises the following steps S3101:

[0430] Step S3101, the control device performs PID operation based on the current temperature value and the preset temperature value interval to obtain a fourth analog quantity, and adjusts the valve opening degree of the heat conducting oil flow meter based on the fourth analog quantity.

[0431] In the embodiments of the present disclosure, the control device 2 performs PID operation based on the current temperature value and the preset temperature value interval to obtain a fourth analog quantity, and adjusts the valve opening degree of the heat conducting oil flow meter 351 based on the fourth analog quantity.

[0432] In some embodiments of the present disclosure, referring to FIG. 4, the first box wall 3121 of the first air bellow 312 in the box body 311 is provided with a visual detection device 327, and the drying data further comprises appearance data obtained after the visual detection device 327 performs image acquisition on the pole piece 100. The control device 2 adjusts the initial drying parameter in the case that the drying data does not conform to the preset data reference benchmark. Referring to FIG. 39, the specific method comprises the following steps S3201:

[0433] Step S3201, the control device adjusts the first parameter, and / or the second parameter, and / or the third parameter in the case that the appearance data does not conform to the preset appearance reference benchmark.

[0434] In the embodiments of the present disclosure, the control device 2 adjusts the first parameter, and / or the second parameter, and / or the third parameter in the case that the appearance data does not conform to the preset appearance reference benchmark.

[0435] In the embodiments of the present disclosure, after the control device 2 obtains the appearance data of the pole piece 100 after completing the drying process, if the appearance data does not conform to the preset appearance reference benchmark, the control device 2 can first locate the reason why the appearance data of the pole piece 100 does not conform to the preset appearance reference benchmark according to the appearance data, and then adjusts the first parameter, and / or the second parameter, and / or the third parameter according to the reason,

[0436] For example, if the surface of the pole piece 100 cracks after the drying process is completed, the cause of the surface cracking of the pole piece 100 can be located first, that is, the drying temperature is too high or the air volume is too large to cause the air drying speed to be too fast, and then the parameters for adjusting the temperature and the air volume in the first parameter, the second parameter and the third parameter are determined, and the corresponding parameters are adjusted. If the surface of the pole piece 100 is wet after the drying process is completed, the cause of the surface being wet after the drying process is completed can be located first, that is, the drying temperature is too low or the air volume is too small to cause the air drying speed to be too slow, and then the parameters for adjusting the temperature and the air volume in the first parameter, the second parameter and the third parameter are determined, and the corresponding parameters are adjusted. The specific way of adjusting the first parameter, the second parameter and the third parameter according to the appearance data can be selected according to the actual situation, and the embodiments of the present disclosure do not make specific limitations here.

[0437] For example, referring to FIG. 40, an example of parameter adjustment according to appearance data is given, which specifically includes steps S3301 to S3301:

[0438] In step S3301, the appearance data of the pole piece is obtained by the visual detection device in each oven in the stable coating stage.

[0439] In step S3302, it is judged whether the appearance data meets the preset appearance reference standard.

[0440] Specifically, if the appearance data meets the preset appearance reference standard, step S3103 is entered, and if the edge of the appearance data meets the preset appearance reference standard, step S3104 is entered.

[0441] In step S3303, the second fresh air fan frequency of the fresh air fan of the oven and / or the heating temperature of the heat exchange device is adjusted for the appearance data that does not meet the preset appearance reference standard.

[0442] In step S3304, the appearance closed-loop adjustment in the stable coating stage is completed.

[0443] In some embodiments of the present disclosure, the control device 2 can use the adjusted drying parameters to dry the next batch of pole pieces after adjusting the initial drying parameters. Referring to FIG. 41, the specific method includes steps S3401 to S3402:

[0444] In step S3401, the control device obtains the final drying parameters of the drying device 1 when the drying process is completed.

[0445] In the embodiments of the present disclosure, the control device 2 obtains the final drying parameters of the drying device 1 when the drying process is completed.

[0446] In the embodiments of the present disclosure, the control device 2 can obtain the final drying parameters of the drying device 1 after the debugging for the first batch of pole pieces 100, and then the final drying parameters can be directly applied to the next batch of pole pieces 100. Based on this, the drying process for the same pole pieces 100 can be completed through one debugging, thereby avoiding the technical problem that in the prior art, the drying device needs to be adjusted after artificial observation of the drying condition in each drying process for the pole pieces 100, and thereby the labor cost and the pole piece scrap cost are reduced.

[0447] In step S3402, the control device controls the drying device to dry the next batch of pole pieces according to the final drying parameters in the case that the drying process for the next batch of pole pieces starts.

[0448] In the embodiments of the present disclosure, the control device 2 controls the drying device 1 to dry the next batch of pole pieces 100 according to the final drying parameters in the case that the drying process for the next batch of pole pieces 100 starts.

[0449] In the embodiments of the present disclosure, the control device 2 can also continuously detect the drying process of the next batch of pole pieces 100 when controlling the drying device 1 to dry the next batch of pole pieces 100 according to the final drying parameters, so that the final drying parameters can be adjusted in a small range to achieve the best drying effect.

[0450] In the embodiments of the present disclosure, the drying system further includes a control panel. Referring to FIGS. 9 and 42, the control panel 300 at least includes a first drying device 3a (lower layer in the control panel 300) and a second drying device 3b (lower layer in the control panel 300), each layer including 12 ovens. Before the drying process for the pole pieces starts, the heating temperature interval, the preset negative pressure value interval, the preset air speed value interval, and the preset NMP concentration value interval of each oven can be set on the control panel 300. During the drying process for the pole pieces, the current temperature value, the current air speed value, the current NMP concentration value, and the current negative pressure value of each oven can be observed on the control panel 300 in real time. In the case that the current temperature value, the current air speed value, the current NMP concentration value, and the current negative pressure value do not meet the corresponding heating temperature interval, the preset negative pressure value interval, the preset air speed value interval, and the preset NMP concentration value interval, the initial drying parameters are adjusted based on the current temperature value, the current air speed value, the current NMP concentration value, and the current negative pressure value to achieve the best drying effect.

[0451] The embodiment of the present disclosure provides a drying method, which is applied to a drying system, and the drying system comprises a drying device and a control device; the method comprises the following steps: the drying device performs drying on an electrode sheet according to initial drying parameters; the control device acquires drying data of the electrode sheet in a drying process every preset time period under the condition that a drying process of the electrode sheet is started; and the control device adjusts the initial drying parameters until the drying process is completed under the condition that the drying data does not conform to preset data reference criteria. By adjusting the initial drying parameters at a fixed time through the control device, the drying data can be kept in the preset data reference criteria as much as possible in the whole drying process, so that the uniformity of the drying effect is improved, and the quality of the electrode sheet is improved.

[0452] The embodiment of the present disclosure further provides a computer program product, which comprises a computer program or instructions, and the computer program or instructions are executed by one or more processors to realize the steps in the drying method.

[0453] The embodiment of the present disclosure further provides a computer readable storage medium, which stores a computer program, and the computer readable storage medium stores one or more programs, the one or more programs can be executed by one or more processors, and the computer program is applied to a drying system, and realizes the drying method as described above.

[0454] It should be noted that: the description of the above storage medium and device embodiments is similar to the description of the above method embodiments, and has similar beneficial effects to the method embodiments. For technical details not disclosed in the storage medium and device embodiments of the present disclosure, please refer to the description of the method embodiments of the present disclosure for understanding.

[0455] The processor can be at least one of an application specific integrated circuit (ASIC), a digital signal processor (DSP), a digital signal processing device (DSPD), a programmable logic device (PLD), a field programmable gate array (FPGA), a central processing unit, a controller, a microcontroller, and a microprocessor. It can be understood that the electronic device for realizing the functions of the processor can also be other devices, and the embodiment of the present disclosure is not limited specifically.

[0456] The computer storage medium / memory can be a Read Only Memory (ROM), a Programmable Read-Only Memory (PROM), an Erasable Programmable Read-Only Memory (EPROM), an Electrically Erasable Programmable Read-Only Memory (EEPROM), a Ferromagnetic Random Access Memory (FRAM), a Flash Memory, a magnetic surface storage, an optical disc, a Compact Disc Read-Only Memory (CD-ROM), or the like memory; or can be various terminals including one or any combination of the above memories, such as a mobile phone, a computer, a tablet device, a personal digital assistant, and the like.

[0457] It should be understood that every monetary reference made herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic in relation to an embodiment is included in at least one embodiment of the present disclosure. Thus, appearances of the phrases "in one embodiment" or "in an embodiment" in various places in the specification are not necessarily referring to the same embodiment. Further, the particular features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. It should be understood that the sequence of steps / processes described above in various embodiments of the present disclosure does not mean the order of execution, and the execution order of the steps / processes should be determined according to their functions and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present disclosure. The above sequence number of the embodiments of the present disclosure is only for description, and does not represent the advantages or disadvantages of the embodiments.

[0458] It should be noted that, in this document, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements, but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without more limitations, an element defined by the statement "comprising a" does not exclude the existence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0459] In several embodiments provided by the present disclosure, it should be understood that the disclosed devices and methods can be implemented in other manners. The embodiments described above are merely exemplary, and are not intended to limit the application. For example, the division of the units is merely logical function division, and there can be other division manners in actual implementation. For example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the components shown or discussed can be indirect coupling or communication connection through some interfaces, devices or units, and can be electrical, mechanical or in other forms.

[0460] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units; they can be located in one place or distributed on a plurality of network units; and some or all of the units can be selected according to actual needs to achieve the purpose of the embodiments.

[0461] In addition, each functional unit in each embodiment of the present disclosure can be integrated into one processing unit, or each unit can be a separate unit, or two or more units can be integrated into one unit; and the integrated unit can be implemented in the form of hardware or hardware plus software functional units.

[0462] Those skilled in the art can understand that all or part of the steps of the above-mentioned method embodiments can be completed by program instruction related hardware, and the foregoing program can be stored in a computer readable storage medium, and the program is executed to perform the steps of the above-mentioned method embodiments; and the foregoing storage medium includes mobile storage devices, read only memory (ROM), magnetic discs or optical discs and various storage medium that can store program codes.

[0463] Alternatively, the integrated units of the present disclosure, if implemented in the form of software functional modules and sold or used as independent products, can also be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present disclosure can be embodied in the form of a software product, and the computer software product is stored in a storage medium, and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the embodiments of the present disclosure. The foregoing storage medium includes mobile storage devices, ROM, magnetic discs or optical discs and various storage medium that can store program codes.

[0464] The above merely describes the embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present disclosure, which should be covered within the protection scope of the present disclosure.

Claims

1. A drying device, comprising: at least two connected ovens, each of which is provided with a drying area for drying an electrode plate during the passing of the electrode plate through the oven, and is provided with an air pressure detection device for detecting an air pressure value in the oven as a partial air pressure value, and is provided with a fresh air inlet for fresh air and an exhaust air outlet for exhaust air in the oven; a fresh air main pipe, to which the fresh air inlets of the ovens are respectively connected through pipes, and which is provided with a total fresh air fan, and which is provided with a fresh air fan valve at each of the fresh air inlets of the ovens; an exhaust air main pipe, to which the exhaust air outlets of the ovens are respectively connected through pipes, and which is provided with a total exhaust air fan, and which is provided with an exhaust air fan valve at each of the exhaust air outlets of the ovens; an NMP recovery system for recovering N-methyl pyrrolidone generated during the drying of the electrode plate in the drying area of each of the ovens, and which is connected to an outlet of the NMP recovery system, and which is connected to an inlet of the NMP recovery system, the ovens with the partial air pressure values not in a preset partial negative pressure value range are taken as air pressure adjustment ovens, and in the presence of at least one of the air pressure adjustment ovens, the output power of the total fresh air fan and the total exhaust air fan and the opening degree of the fresh air fan valve and the exhaust air fan valve of the air pressure adjustment oven are adjusted so that the partial air pressure value of the air pressure adjustment oven is in the preset partial negative pressure value range.

2. The drying device according to claim 1, wherein each of the ovens is provided with an NMP concentration detection device at the exhaust air outlet, which is used for detecting a partial NMP concentration value of the exhaust air passing through the exhaust air outlet; each of the ovens is provided with a circulating fan, which is used for driving the circulating air flowing back from the drying area and the air after the confluence of the fresh air and the circulating air to flow towards the drying area; the ovens with the partial NMP concentration values not in a preset partial NMP concentration value range are taken as concentration adjustment ovens, and in the presence of at least one of the concentration adjustment ovens, the output power of the circulating fan of the concentration adjustment oven and the opening degree of the fresh air fan valve and the exhaust air fan valve are adjusted so that the partial NMP concentration value of the concentration adjustment oven is in the preset partial NMP concentration value range.

3. The drying device according to claim 2, wherein each of the ovens is provided with an air box inlet air speed detection device, which is used for detecting an air speed value of the circulating air and the air after the confluence of the fresh air; in the case that the air speed value detected by the air box inlet air speed detection device is not in a preset air speed value range, the circulating fan is adjusted so that the air speed value detected by the air box inlet air speed detection device is in the preset air speed value range.

4. The drying device according to claim 3, wherein each of the ovens is provided with a fresh air fan and a fresh air speed detection device at the fresh air inlet, the fresh air fan can adjust the air speed of the fresh air inlet, and the fresh air speed detection device detects the air speed of the fresh air inlet; The exhaust fan is capable of adjusting the air speed of the exhaust port, and the exhaust speed detection device detects the air speed of the exhaust port; In the presence of at least one said to be adjusted air pressure oven, the output power of the total fresh air fan and the total exhaust fan, the opening degree of the fresh air damper and the exhaust air damper of the to-be-adjusted air pressure oven, and the output power of the fresh air fan and the exhaust fan are adjusted, so that the sub-air pressure value of the to-be-adjusted air pressure oven is in the preset sub-negative pressure value interval, In the presence of at least one said to be adjusted concentration oven, the output power of the circulating fan of the to-be-adjusted concentration oven, the opening degree of the fresh air damper and the exhaust air damper, and the output power of the fresh air fan and the exhaust fan are adjusted, so that the sub-NMP concentration value of the to-be-adjusted concentration oven is in the preset sub-NMP concentration value interval.

5. The drying apparatus of claim 4, wherein, Each of the ovens is provided with a heat exchange device for heating the temperature of the gas after the circulating air and the fresh air are converged, In the presence of at least one said to be adjusted concentration oven, the heating temperature of the heat exchange device of the to-be-adjusted concentration oven is adjusted, so that the sub-NMP concentration value of the to-be-adjusted concentration oven is in the preset sub-NMP concentration value interval.

6. The drying apparatus of claim 5, wherein, In the presence of at least one said to be adjusted concentration oven, the output power of the total fresh air fan and / or the total exhaust fan is adjusted, so that the sub-NMP concentration value of the to-be-adjusted concentration oven is in the preset sub-NMP concentration value interval.

7. The drying apparatus according to claim 5, wherein The exhaust main pipe is provided with a total exhaust NMP concentration detection device for detecting the total NMP concentration value of the gas passing through the exhaust main pipe, In the presence of at least one said to be adjusted concentration oven, and the total NMP concentration value is not in the preset total NMP concentration value interval, by first adjusting the output power of the circulating fan of the to-be-adjusted concentration oven and the heating temperature of the heat exchange device, so that the total NMP concentration value is in the preset total NMP concentration value interval, then adjusting the output power of the fresh air fan and the exhaust fan of the to-be-adjusted concentration oven, the opening degree of the fresh air damper and the exhaust air damper, and the heating temperature of the heat exchange device, so that the sub-NMP concentration value of the to-be-adjusted concentration oven is in the preset sub-NMP concentration value interval.

8. The drying apparatus according to any one of claims 4 to 7, wherein The exhaust main pipe is provided with a total pressure detection device for detecting the total air pressure value in the exhaust main pipe, In the presence of at least one said to be adjusted air pressure oven, and the total air pressure value is not in the preset total negative pressure value interval, by first adjusting the output power of the total fresh air fan and the total exhaust fan, so that the total air pressure value is in the preset total negative pressure value interval, then adjusting the output power of the fresh air fan and the exhaust fan of the to-be-adjusted air pressure oven, and the opening degree of the fresh air damper and the exhaust air damper, so that the sub-air pressure value is in the preset sub-negative pressure value interval.

9. The drying apparatus according to any one of claims 1 to 8, wherein The fresh air main pipe is provided with a total fresh air speed measuring device, which detects the air speed in the fresh air main pipe during adjustment of the total fresh air fan. The exhaust air main pipe is provided with a total exhaust air speed measuring device, which detects the air speed in the exhaust air main pipe during adjustment of the total exhaust air fan.

10. The drying apparatus of claim 5, wherein, Each of the ovens comprises an oven body, a first air box and a second air box arranged in the oven body, the first air box and the second air box are oppositely arranged and define the drying area therebetween, the first air box is provided with a first air inlet for air to enter, and the second air box is provided with a second air inlet for air to enter, The first air box has a first wall facing the second air box, and the first wall is provided with a plurality of first air nozzles with outlets facing the drying area, the first air nozzles are used for discharging air in the first air box towards the pole piece; The wall of the second air box facing the first air box is provided with a plurality of second air nozzles with outlets facing the drying area, the second air nozzles are used for discharging air in the second air box towards the pole piece, The oven body is provided with the fresh air inlet and the exhaust air outlet, the fresh air inlet is connected to the first air inlet of the first air box and the second air inlet of the second air box, and the exhaust air outlet is connected to the drying area.

11. The drying apparatus of claim 10, wherein, The oven body is provided with a return air channel, the return air channel is provided with the circulating fan, the fresh air inlet and the exhaust air outlet are connected to the return air channel, the circulating fan is used to drive the air in the drying area to flow through the return air channel and the exhaust air outlet, so that part of the air is discharged through the exhaust air outlet, and the remaining air in the return air channel and the fresh air supplemented from the fresh air inlet enter the first air inlet and the second air inlet through the return air channel, The return air channel is provided with the heat exchange device and the air box air inlet speed measuring device between the fresh air inlet and the first air inlet and the second air inlet.

12. The drying apparatus of claim 11, wherein, The first air inlet of the first air box is provided with a first air inlet damper, and the second air inlet of the second air box is provided with a second air inlet damper, During adjustment of the output power of the circulating fan, the opening degree of the first air inlet damper and / or the second air inlet damper is adjusted.

13. The drying apparatus of claim 11, wherein, The first wall is provided with a return air nozzle for returning the air in the drying area to the return air channel.

14. The drying apparatus of claim 11, wherein, The outer side of the first wall of the first air box is provided with a visual detection device, which is used to detect the appearance of the pole piece in the drying area.

15. The drying apparatus of claim 14, wherein, The visual detection device is connected to the outer side of the first wall through a mounting assembly, and the mounting assembly is configured to adjust the position of the visual detection device along the width direction of the pole piece.

16. A coating machine comprising: a first coating head for coating a first surface of a substrate to form a pole piece; a first oven formed by the oven device of any one of claims 1 to 15, and a second oven, the first oven being arranged downstream of the first coating head and used for drying the pole piece with the first surface facing upward.

17. A coating method comprising: coating a first surface of a substrate to form a pole piece; and drying the pole piece with the first surface facing upward by using the first oven formed by the oven device of any one of claims 1 to 15 and the second oven. A second coating head is arranged downstream of the first drying device and is configured to coat a second surface of the pole piece; A climbing mechanism is arranged downstream of the second coating head and upstream of the second drying device. The climbing mechanism is configured to support and pull the pole piece from one side of the first surface of the pole piece so that the pole piece enters the second drying device with the second surface facing upward. The second drying device is configured to dry the pole piece with the second surface facing upward.

17. A drying method using a drying device, wherein the drying device comprises a fresh air main pipe, an exhaust air main pipe, and at least two connected drying ovens, each of the drying ovens is provided with a drying area for drying a pole piece, each of the drying ovens is provided with an air pressure detection device for detecting an air pressure value in the drying oven as a partial air pressure value, each of the drying ovens is provided with a fresh air inlet for fresh air and an exhaust air outlet for exhaust air in the drying oven, the fresh air inlets of the drying ovens are respectively connected to the fresh air main pipe through pipelines, the fresh air main pipe is provided with a total fresh air fan, and each of the fresh air inlets of the drying ovens is provided with a fresh air damper; the exhaust air outlets of the drying ovens are respectively connected to the exhaust air main pipe through pipelines, the exhaust air main pipe is provided with a total exhaust air fan, and each of the exhaust air outlets of the drying ovens is provided with an exhaust air damper; an NMP recovery system is used to recover N-methyl pyrrolidone generated in the drying process of the pole piece in the drying area of each of the drying ovens, the fresh air main pipe is connected to an outlet of the NMP recovery system, and the exhaust air main pipe is connected to an inlet of the NMP recovery system; The drying method comprises: An air pressure adjustment step, wherein the drying ovens with the partial air pressure values not in a preset partial negative pressure value interval are regarded as drying ovens to be adjusted, and the output power of the total fresh air fan and the total exhaust air fan and the opening degree of the fresh air dampers and the exhaust air dampers of the drying ovens to be adjusted are adjusted so that the partial air pressure values of the drying ovens to be adjusted are in the preset partial negative pressure value interval.

18. The drying method according to claim 17, wherein, Each of the drying ovens is provided with a circulating fan, which is used to drive the circulation of the circulating air and the air after the convergence of the fresh air and the exhaust air in the drying area towards the drying area; and each of the drying ovens is provided with a wind box inlet air speed detection device, which is used to detect the air speed value of the circulating air and the air after the convergence of the fresh air and the exhaust air. The drying method further comprises: An air speed adjustment step, wherein the circulating fan is adjusted when the air speed value detected by the wind box inlet air speed detection device is not in a preset air speed value interval so that the air speed value detected by the wind box inlet air speed detection device is in the preset air speed value interval.

19. The drying method according to claim 18, wherein, Each of the drying ovens is provided with an NMP concentration detection device at the exhaust air outlet, which is used to detect a partial NMP concentration value of the exhaust air. The drying method further comprises: The concentration adjustment step adjusts the output power of the circulating fan and the opening of the fresh air damper and exhaust air damper of the to-be-adjusted concentration oven, so that the partial NMP concentration value of the to-be-adjusted concentration oven is in the preset partial NMP concentration value interval.

20. The drying method according to claim 19, wherein, The fresh air port of each oven is provided with a fresh air fan for adjusting the air speed of the fresh air port; the exhaust port of each oven is provided with an exhaust air fan for adjusting the air speed of the exhaust port; In the air pressure adjustment step, the output power of the fresh air fan and the exhaust air fan of the to-be-adjusted air pressure oven is also adjusted. In the concentration adjustment step, the output power of the fresh air fan and the exhaust air fan of the to-be-adjusted concentration oven is also adjusted.

21. The drying method according to claim 20, wherein, Each oven is provided with a heat exchange device for heating the temperature of the gas after the circulating air and the fresh air are converged; In the concentration adjustment step, the heating temperature of the heat exchange device of the to-be-adjusted concentration oven is also adjusted.

22. The drying method according to claim 20 or 21, wherein, In the concentration adjustment step, the output power of the total fresh air fan and / or the total exhaust air fan is also adjusted.

23. The drying method according to claim 21, wherein, The exhaust air main pipe is provided with a total exhaust air NMP concentration measuring device for detecting the total NMP concentration value of the gas passing through the exhaust air main pipe; The concentration adjustment step includes: A total concentration adjustment step adjusts the output power of the circulating fan and the heating temperature of the heat exchange device of the to-be-adjusted concentration oven, so that the total NMP concentration value is in the preset total NMP concentration value interval, in the presence of at least one to-be-adjusted concentration oven and the total NMP concentration value is not in the preset total NMP concentration value interval; A partial concentration adjustment step adjusts the output power of the fresh air fan and the exhaust air fan, the opening of the fresh air damper and the exhaust air damper, and the heating temperature of the heat exchange device of the to-be-adjusted concentration oven, so that the partial NMP concentration value of the to-be-adjusted concentration oven is in the preset partial NMP concentration value interval.

24. The drying method according to any one of claims 20 to 23, wherein, The exhaust air main pipe is provided with a total pressure detection device for detecting the total air pressure value in the exhaust air main pipe; The air pressure adjustment step includes: A total air pressure adjustment step adjusts the output power of the total fresh air fan and the total exhaust air fan, so that the total air pressure value is in the preset total negative pressure value interval, in the presence of at least one to-be-adjusted air pressure oven and the total air pressure value is not in the preset total negative pressure value interval; A partial air pressure adjustment step adjusts the output power of the fresh air fan and the exhaust air fan of the to-be-adjusted air pressure oven and the opening of the fresh air damper and the exhaust air damper, so that the partial air pressure value is in the preset partial negative pressure value interval.

25. The drying method according to any one of claims 19 to 24, wherein, The drying area of each of the ovens is provided with a visual detection device for detecting the appearance of the pole piece passing through the drying area; The drying method further comprises: a visual feedback step, in the case that the appearance detected by the visual detection device does not conform to the preset appearance reference benchmark, performing the air pressure adjustment step, and / or the air speed adjustment step, and / or the concentration adjustment step.

26. The drying method according to claim 17, wherein, The drying method further comprises: In the case that the drying process of a batch of pole pieces is completed, final drying parameters are obtained, the final drying parameters including the final output power of the total fresh air fan and the total exhaust fan and the final opening degree of the fresh air damper and the exhaust air damper of the air pressure to be adjusted oven; In the case that the drying device starts the drying process of the next batch of pole pieces, the drying device performs drying on the next batch of pole pieces according to the final drying parameters.

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