Infrared and hot air combined drying system and method for battery pole piece

Abstract

The invention discloses an infrared and hot air combined drying system and method for battery pole pieces, the two ends of a drying box body are connected with air circulation devices respectively, the air circulation devices are used for conducting air circulation in a drying box device, an infrared drying device and a weighing device are arranged in the drying box body, and the battery pole pieces to be dried are arranged on the weighing device; the hot air drying device is arranged on a circulating pipeline of the air circulating device, hot air can blow away an air film on the surface layer of the pole piece, infrared radiation can penetrate into the pole piece more effectively, meanwhile, the hot air can also evenly transmit heat to all positions of the pole piece, high-concentration waste gas containing a solvent is exhausted in time, fresh dry hot air is supplemented, and the service life of the pole piece is prolonged. The volatilization and discharge rate of the solvent is greatly improved, the mass transfer resistance is reduced, and the drying quality of the pole piece is improved. The drying speed is greatly improved, the drying time is shortened, and the production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of drying technology, and in particular to a rapid drying system and method for in-situ weighing of battery pole pieces. Background Art

[0002] Battery pole pieces are a crucial component of lithium-ion batteries, and pole piece coating drying is a critical step in electrode production. The drying method and conditions directly impact the quality of the pole pieces, and this process plays a decisive role in subsequent battery manufacturing processes. Whether from the perspective of battery quality, economic benefits, or energy conservation and emission reduction, effective drying technology can improve pole piece drying efficiency, reduce energy consumption, enhance the physical and chemical properties of the pole pieces, increase the capacity of the finished battery, and extend its service life.

[0003] Currently, the primary drying method used by battery manufacturers is hot air convection drying. Hot air acts as a drying medium, heating the electrode by convection or radiation, displacing the solvent in the electrode. However, the rate of solvent migration varies, causing stress when the electrode shrinks. If the hot air temperature during drying is too high, the coating is prone to cracking, surface wrinkling, and other defects after drying. If the hot air temperature is too low, the drying process takes a long time and consumes more energy. Infrared drying uses infrared radiation to transfer energy, simultaneously heating the surface and interior of the electrode, providing a higher drying rate. However, during single infrared drying, a solvent-enriched air film forms on the electrode surface. This air film inhibits the volatilization of the solvent on the electrode surface and affects the penetration efficiency of infrared radiation. The absorption of infrared radiation on the electrode surface can be uneven, resulting in uneven temperature distribution on the electrode surface, making it impossible to effectively and quickly achieve high-quality drying of battery electrodes. Summary of the Invention

[0004] The purpose of the present invention is to provide a rapid drying system and method for in-situ weighing of battery pole pieces to overcome the shortcomings of the prior art. The present invention can reduce energy consumption, improve pole piece quality, and achieve accurate in-situ weighing.

[0005] To achieve the above object, the technical solution adopted by the present invention is as follows: A battery electrode combined infrared and hot air drying system includes an oven device and an air circulation device. The oven device includes a drying box body, and both ends of the drying box body are respectively connected to the air circulation device. The air circulation device is used to circulate air in the drying box body. An infrared drying device and a weighing device are provided in the drying box body. The battery electrode to be dried is placed on the weighing device, and a hot air drying device is provided on the circulation pipe of the air circulation device.

[0006] Preferably, the left and right ends of the drying box are respectively provided with an air inlet and an air outlet, the air inlet and the air outlet are respectively connected to the air outlet and air inlet of the air circulation device, and a visual window is also provided on the drying box; a top plate is provided at the upper end of the drying box, and a gas concentration detector and an infrared temperature probe are provided inside the drying box.

[0007] Preferably, the viewing window is connected to the drying box body via a hinge; and the top plate is connected to the drying box body via a hasp lock.

[0008] Preferably, the weighing device includes a tray, a weighing scale is provided at the bottom of the tray, an infrared lamp is provided at the upper end of the tray, the tray is located in the drying box, and the weighing scale is located at the bottom of the drying box; the tray is connected to the weighing rod of the weighing scale through a connecting rod.

[0009] Preferably, the infrared lamp tube is fixedly installed by a lamp stand, and the lamp stand is installed by a lifting motor, and the lifting motor is used to control the lifting of the lamp stand.

[0010] Preferably, the air circulation device includes an air heater and a centrifugal fan; the oven device, air heater and centrifugal fan are connected by a pipeline, the air heater is connected to the air inlet end of the oven to provide heat for the air entering the oven; a valve is provided at the air outlet end of the oven; an orifice flow meter is provided on the pipeline, and an activated carbon adsorption box is connected to the pipeline.

[0011] Preferably, it also includes a control device and a data acquisition device, and the control device is used to adjust the hot air temperature, hot air flow, the distance between the infrared lamp and the battery electrode and the heating power. The data acquisition device collects and stores real-time data on the parameters of the electrode quality, temperature, oven humidity and device energy consumption during the drying process.

[0012] Preferably, the lamp holder adopts a frame structure, and slide rails are installed on two opposite sides of the lamp holder. Sliders that can be connected to the slide rails are provided at both ends of the infrared lamp tube, and a screw for adjusting the sliding of the slide rail is provided on the slide rail.

[0013] Preferably, the device for realizing gas detection includes a gas concentration detector, which is distributed at the upper air outlet and the lower air outlet on the top of the box body and is used to detect the concentration of volatile organic matter when the battery electrode is drying.

[0014] A method for drying battery pole pieces by combining infrared and hot air, comprising the following steps: Place the coated electrode in the oven device; Turn on the air circulation device to dry the electrode in the oven device, adjust the gas flow rate and temperature of the air circulation device according to the drying requirements, and obtain the temperature changes on the electrode surface and in the oven, as well as the electrode quality. Changes in the temperature, energy consumption of the device, and humidity in the oven are monitored until drying is completed, and drying is terminated after natural cooling.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention provides a battery pole piece infrared hot air combined drying system, comprising an oven device and an air circulation device, the oven device comprising a drying box body, both ends of the drying box body being connected to the air circulation device respectively, the air circulation device being used to circulate air in the drying box body, an infrared drying device and a weighing device being provided in the drying box body, the battery pole piece to be dried being provided on the weighing device, and a hot air drying device being provided on a circulation pipe of the air circulation device, the hot air can blow away the air film on the surface of the pole piece, so that the infrared radiation can penetrate into the interior of the pole piece more effectively, and at the same time the hot air can also transfer heat evenly to various positions of the pole piece, discharge high-concentration waste gas containing solvent in time and replenish fresh dry hot air, thereby greatly improving the volatilization and discharge rate of the solvent, reducing the mass transfer resistance, improving the drying quality of the pole piece, greatly improving the drying rate, shortening the drying time, and improving the production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the present invention or related technologies, a brief introduction is given below to the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a schematic diagram of the overall structure of the infrared hot air combined drying system provided by the present invention.

[0018] Figure 2 This is a schematic diagram of the cross-sectional structure of the oven provided by the present invention.

[0019] Figure 3 This is a schematic diagram of the lamp holder structure in the oven structure provided by the present invention.

[0020] Figure 4 This is an overall schematic diagram of the tray in the oven structure provided by the present invention.

[0021] Figure 5 1 is a moisture ratio-time curve diagram of three drying methods in the embodiment of the present invention.

[0022] Figure 6 1 is a drying rate-time curve diagram of three drying methods in the embodiment of the present invention.

[0023] Figure 7 This is a diagram showing the effect of single infrared drying in an embodiment of the present invention.

[0024] Figure 8 This is a diagram showing the effect of infrared-hot air combined drying in an embodiment of the present invention.

[0025] In the figure: 1: oven device, 2: air circulation device, 3: control device, 4: data acquisition device; 101: air inlet, 102: air outlet, 103: viewing window, 104: top plate, 105: gas concentration detector, 106: infrared temperature probe, 107: lifting motor, 108: lamp holder, 109: infrared lamp tube, 110: weighing balance, 111: gas distributor, 112: temperature measuring point, 113: tray, 114: connecting rod, 115: dry-bulb temperature, 116: wet-bulb temperature, 201: pipeline, 202: air heater, 203: valve, 204: centrifugal fan, 205: orifice flowmeter, 206: activated carbon adsorption box. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0027] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0028] like Figures 1 to 4As shown, the present invention provides an infrared hot air combined drying system for battery pole pieces, which is used to reduce energy consumption, improve pole piece quality, and achieve accurate in-situ weighing. Specifically, it includes a drying oven device 1 and an air circulation device 2. The drying oven device 1 includes a drying box body, and the two ends of the drying box body are respectively connected to the air circulation device 2. The air circulation device 2 is used to circulate air in the drying box body 1. An infrared drying device and a weighing device are provided in the drying box body. The battery pole pieces to be dried are arranged on the weighing device. A hot air drying device is provided on the circulation pipeline of the air circulation device 2, which can provide circulating hot air to assist in drying the battery pole pieces to be dried in the drying box body. The present application can achieve different adjustments such as different radiation power, radiation height, hot air speed, hot air temperature and lamp tube spacing. It has different drying methods such as pure hot air, pure infrared, and infrared hot air combined. It can collect and store real-time data on parameters such as the quality and temperature of the electrode during the drying process. It can also measure the energy consumption of each device and the temperature, humidity, wind speed in the oven under different working conditions, analyze the changes in the quality and drying rate of the electrode during drying, and explore the drying mechanism of the electrode. This application uses circulating hot air and internal infrared drying devices for drying. The hot air can blow away the air film on the surface of the electrode, so that the infrared radiation can penetrate more effectively into the interior of the electrode. At the same time, the hot air can also transfer heat evenly to various positions of the electrode, and timely discharge the high-concentration exhaust gas containing solvents and replenish fresh dry hot air, which greatly improves the volatilization and discharge rate of the solvent, reduces the mass transfer resistance, and improves the drying quality of the electrode. The infrared-hot air combined drying gives full play to their respective advantages, makes up for each other's shortcomings, greatly improves the drying rate, shortens the drying time, and improves production efficiency.

[0029] like Figure 2 As shown, the left and right ends of the drying box are respectively provided with an air inlet 101 and an air outlet 102, the air inlet 101 and the air outlet 102 are respectively connected to the air outlet and air inlet of the air circulation device, and the drying box is also provided with a visual window 103 for observing the internal drying conditions; a top plate 104 is provided at the upper end of the drying box, and a gas concentration detector 105 and an infrared temperature probe 106 are provided in the drying box. The top plate 104 serves as an entrance opening of the drying box and is used to take and place test pieces. The gas concentration detector 105 and the infrared temperature probe 106 are used to detect the internal gas concentration and the temperature of the test pieces respectively.

[0030] The visual window 103 is connected to the drying box body by a hinge, and is distributed one at the front and back of the drying box body, so as to facilitate observation of the drying condition of the battery electrodes; the top plate 104 is connected to the drying box body by a snap lock, which is convenient for disassembly, and holes can be drilled at appropriate positions on it to place other detection devices; the gas distributor is located at the air inlet and plays a role in evenly distributing the airflow.

[0031] In a specific embodiment of the present application, the weighing device includes a tray 113, a weighing scale 110 is provided at the bottom of the tray 113, an infrared lamp 109 is provided at the upper end of the tray 113, and the infrared lamp 109 is used to dry the test pieces on the tray 113. The tray 113 is located in a drying box, and the weighing scale 110 is located at the bottom of the drying box; the tray 113 is connected to the weighing rod of the weighing scale 110 through a connecting rod 114.

[0032] The infrared lamp tube 109 is fixedly installed by a lamp holder 108, and the lamp holder 108 is installed by a lifting motor 107. The lifting motor 107 is used to control the lifting of the lamp holder 108 to adjust the distance between the infrared lamp tube 109 and the test piece; a gas distributor 111 and a temperature measuring point 112 are also provided in the drying box.

[0033] In a specific embodiment of the present application, the air circulation device 2 includes an air heater 202, a valve 203, a centrifugal fan 204, an orifice flowmeter 205, and an activated carbon adsorption box 206; the oven device 1, the air heater 202 and the centrifugal fan 204 are connected by a pipeline 201, and the centrifugal fan 204 is used to transport hot air into the oven; the air heater 202 is connected to the oven air inlet 101 end to provide heat for the air entering the oven; the oven air outlet 102 end is provided with a valve 203; the centrifugal fan 204 is connected in the pipeline to provide flowing air for the drying process; the pipeline 201 is provided with an orifice flowmeter 205 for detecting the air flow; the pipeline 201 is connected to an activated carbon adsorption box 206, and the activated carbon adsorption box 206 is used to absorb organic matter generated during the drying process when it circulates externally.

[0034] In a specific embodiment of the present application, the air circulation device 2 and the drying oven device 1 are connected to a control device 3, which is used to adjust the hot air temperature, hot air flow rate, the distance between the infrared lamp and the battery electrode, and the heating power. The air circulation device 2 is also connected to a data acquisition device 4, which includes a weighing module, a temperature module, a power meter, and a wind speed module. The data acquisition device 4 can realize real-time data collection and storage of electrode mass and temperature parameters during the drying process, and can also measure the energy consumption of each device and the temperature, humidity, and wind speed in the oven under different operating conditions.

[0035] In a specific embodiment of the present application, the lifting motor 107 is used to control the up and down height adjustment of the lamp stand; the lamp stand 108 adopts a frame structure, and slide rails are installed on the two opposite sides of the lamp stand 108. Sliders that can be connected to the slide rails are provided at both ends of the infrared lamp tube 109, and a lead screw for adjusting the sliding of the slider is provided on the slide rail. The lead screw is driven by a motor and can electrically adjust the spacing of the infrared lamp tubes 109; the infrared lamp tubes 109 provide a drying heat source for the battery electrodes, and infrared heat sources of different wavelengths and sizes can be replaced according to the drying material. The device for realizing gas detection includes a gas concentration detector 105, which is distributed at the upwind and downwind positions on the top of the box body and is used to detect the concentration of volatile organic matter when the battery electrodes are dried. The gas concentration detector 105 is interlocked with the infrared lamp 109 and the air heater 202. When the safe concentration is exceeded, the interlock is started, the infrared lamp and the air heater are stopped, and cold air starts to blow into the oven to ensure that the concentration of organic matter in the oven is within the safe concentration range, thereby improving the safety of the system.

[0036] The device for realizing temperature detection includes an infrared temperature measuring probe 106 and a temperature measuring point 112; the infrared temperature measuring probe 106 is distributed on the top plate and the bottom of the box body, and is used to measure the temperature changes of the upper and lower surfaces of the battery electrode during the drying process; the temperature measuring point 112 is a thermocouple distributed at the air inlet 101, and three are arranged vertically at the upper air outlet of the tray 113. The temperature measuring point at the air inlet 101 obtains the inlet air temperature and is interlocked with the air heater 202 to achieve the purpose of controlling the hot air temperature. The temperature measuring point at the upper air outlet of the tray 113 verifies whether the oven temperature reaches the predetermined working condition.

[0037] In the specific implementation of this application, Figure 4 As shown, the tray 113 is a rectangular stainless steel structure with a double-layer hollowed-out tray structure, specifically comprising two hollowed-out frame structures connected by studs. The lower layer is a hollowed-out tray, the middle stainless steel frame is used to place the coated battery electrodes, and the upper layer is used to fix the battery electrodes. The lower and middle layers are separated by a certain height and are adjustable. After the battery electrodes are loaded, the upper and middle layers are fixed to ensure that the upper and lower surfaces of the battery electrodes are in contact with the hot air and remain suspended, which is more in line with actual factory production.

[0038] The device for achieving in-situ weighing includes a weighing scale 110 and a connecting rod 114; the weighing scale 110 includes a weighing pan and an electronic balance, which can record the mass changes of the battery electrodes and the tray during the drying process in real time; the connecting rod 114 is connected to the tray base in the oven and connected to the weighing pan of the weighing scale 110 outside the oven to transmit the mass changes of the battery electrodes during the drying process.

[0039] like Figure 1As shown, three valves are provided at the air outlet end of the drying box body, and the switches of the three valves can control the air circulation mode. When the upper and lower valves are opened and the middle valve is closed, it is external circulation. After the hot air is dried, it is directly discharged through the activated carbon adsorption box. When the upper and lower valves are closed and the middle valve is opened, it is internal circulation. The hot air is recycled in the device to reduce heat loss; the centrifugal fan is connected in the pipeline and arranged in front of the air heater to provide flowing air for the drying process; the orifice flowmeter is distributed below the centrifugal fan to detect the air flow; the activated carbon adsorption box is distributed below the air outlet of the oven to absorb organic matter generated during the drying process during external circulation.

[0040] In a specific embodiment of the present application, a method for implementing an infrared hot air combined rapid drying system for in-situ weighing of battery pole pieces based on the above-mentioned infrared hot air combined rapid drying system for in-situ weighing of battery pole pieces specifically includes the following steps: Oven preheating: Assemble the lamp holder 108 and the infrared lamp tube 109, adjust them to the required spacing, start the power switch, reset the weighing scale 110, turn on the centrifugal fan 204 through the control system 3, adjust the opening to obtain the air flow required for the working condition, adjust the lamp holder 108 to the required height for the working condition, and set the required hot air temperature, lamp tube power and data recording frequency. Start heating the air heater 202 and the infrared lamp tube 109 to preheat the oven.

[0041] Fix the electrode: Place the coated electrode on the middle stainless steel frame, cover it with the upper stainless steel frame, and fix the electrode.

[0042] Drying process: The temperature detected by different temperature measuring points 112 in the oven is used to determine whether the temperature in the oven has reached the required working condition. The visual window 103 is opened, the tray 113 is fixed, and then closed. The data acquisition device 4 can record the temperature changes on the electrode surface and in the oven, the changes in the electrode mass, the energy consumption of the device, and the changes in the humidity in the oven in real time.

[0043] Cooling: After drying is completed, the infrared lamp 109 is turned off through the control system 3, the centrifugal fan 204 is kept on, and the heating temperature of the air heater 202 is reduced to allow the device and the electrode to gradually cool down. After cooling is completed, the centrifugal fan 204 and the air heater 202 are turned off.

[0044] Example 1: When using this system to dry battery electrodes, technicians assemble the lamp holder 108 and infrared lamp tube 109 using sliders, adjust the spacing to the desired distance, turn on the power switch, open the system software, reset the weighing scale 110 to zero, and activate the centrifugal fan 204 through the control system 3. Adjust the opening to obtain the required air flow for the working condition, adjust the lamp holder 108 to the required height, and set the required hot air temperature, lamp power, and data recording frequency. The air heater 202 and infrared lamp tube 109 start heating to preheat the oven. The coated electrode is placed on the middle stainless steel frame, covered with the upper stainless steel frame, and the electrode is fixed.

[0045] The temperature detected by different temperature measuring points 112 in the oven is used to determine whether the temperature in the oven has reached the temperature required for the working condition. The visual window 103 is opened to fix the tray 113, and the visual window 103 is closed. The hot air is blown out from the centrifugal fan 204 through the pipeline 201 to the air heater 202 for heating. The hot air that has reached the temperature required for the working condition enters from the oven air inlet 101, blows through the upper and lower surfaces of the battery electrode, blows out from the oven air outlet 102 and enters the pipeline 201, and can take away the solvent evaporated from the upper surface of the battery electrode. The infrared lamp 109 heats the upper surface of the battery electrode with the power required for the working condition to provide energy for the evaporation and migration of the solvent. The data acquisition device 4 can record the temperature changes on the electrode surface and in the oven, the changes in the quality of the electrode, the energy consumption of the device, the humidity changes in the oven, etc. in real time.

[0046] After drying is completed, the infrared lamp 109 is turned off through the control system 3, the centrifugal fan 204 is kept on, the heating temperature of the air heater 202 is reduced, and the device and the electrode are gradually cooled. After cooling is completed, the centrifugal fan 204 and the air heater 202 are turned off.

[0047] Example 2: Based on Example 1, technicians can also use this system to perform single hot air drying of battery electrodes, which specifically includes the following steps: start the power switch, open the system software, reset the weighing scale 110 to zero, turn on the centrifugal fan 204 through the control system 3, adjust the opening to obtain the air flow required for the working conditions, adjust the required hot air temperature and data recording frequency through the control system 3, start heating with the air heater 202, and preheat the oven. The rest of the drying process is the same as Example 1.

[0048] Example 3: Based on Example 1, technicians can also use this system to perform single infrared drying of battery electrodes, which specifically includes the following steps: assemble the lamp holder 108 and the infrared lamp tube 109 through a slider, adjust them to the required spacing, start the power switch, open the system software, reset the weighing scale 110, and adjust the lamp holder 108 to the required height for the working condition through the control system 3. At the same time, set the required lamp tube power and data recording frequency, start heating of the infrared lamp tube 109, and perform the same subsequent drying process as Example 1 after the power stabilizes.

[0049] Example 4: Based on Example 1, Example 2 and Example 3, the battery pole pieces coated with lithium iron phosphate slurry were subjected to single infrared drying, infrared-hot air combined drying and single hot air drying, respectively, and the energy consumption, drying time, drying rate and 180° peeling force of the three drying methods were compared. The present invention provides a rapid drying system for in-situ weighing of battery pole pieces, which includes main energy-consuming devices: a centrifugal fan, an air heater and an infrared lamp. The rated power of the infrared lamp in this embodiment is 2400W, the rated power of the air heater is 9000W, and the rated power of the fan is 750W. The working conditions and energy consumption of the three drying methods are shown in Table 1 below. Compared with single hot air drying, infrared-hot air combined drying saves 53.1% of energy consumption, and single infrared drying saves 86.1% of energy consumption compared with single hot air drying.

[0050] Table 1 Working conditions and energy consumption data of three drying methods

[0051] When the drying degree reaches 95%, the drying is considered complete, which is determined by the theoretical mass reduction, as follows:

[0052] in: is the theoretical mass reduction, in g; is the current collector mass, in g; is the mass of the electrode after coating, in g; % is the solid content of the slurry.

[0053] The moisture ratio-time curves of the three drying methods are as follows Figure 5 As shown, the drying rate-time curve is as follows Figure 6 As shown, the time of single infrared drying is 260s, and the effect is as shown in the figure Figure 7 As shown in Figure 2, single infrared drying is prone to binder aggregation problems; while the time for infrared-hot air combined drying is 146s, the results are as follows Figure 8 As shown in the figure, the forming effect is uniform, and the time of single hot air drying is 541s. Under the same weighing conditions, the moisture ratio-time curve of single hot air is more turbulent than that of the other two drying methods, and the measurement error is larger. Infrared-hot air combined drying uses a smaller wind speed combined with infrared to obtain a more stable moisture ratio-time curve. At the same time, it can achieve a shorter drying time and a higher drying rate than single infrared drying and single hot air drying.

[0054] The 180° peel force test can be used to quantitatively evaluate the bonding strength between the active material and the current collector, such as copper foil or aluminum foil, on the lithium battery electrode. If the peel strength is too low, as the active material expands cyclically during the charge and discharge process, it may detach from the current collector, causing the battery performance to decay rapidly. The quality of the electrodes dried by the three methods is shown in Table 2 below. Among them, the 180° peel force of the electrode dried by infrared-hot air combination is the largest, and the 180° peel force of the electrode dried by single hot air is the smallest. The drying condition of the electrode can be qualitatively judged from its appearance. The electrode dried by single infrared will have uneven distribution of adhesive due to local overheating, i.e. dark black marks, which can easily lead to a decrease in performance and safety of the subsequent assembled battery; the electrode dried by single hot air and infrared-hot air combination is heated evenly, and the appearance of the electrode is better.

[0055] Table 2: Quality data of electrodes dried in three ways

[0056] In summary, infrared-hot air combined drying achieves more stable in-situ online weighing by using infrared as the main method and hot air as the auxiliary method. Compared with the above two single drying methods, it has a higher drying rate and shorter drying time, can effectively reduce the energy consumption of electrode drying, and obtain dry electrodes with good appearance and high peel strength.

[0057] The technical principles of the embodiments of the present invention have been described above in conjunction with specific embodiments. These descriptions are intended solely to explain the principles of the embodiments of the present invention and should not be construed in any way as limiting the scope of protection of the embodiments of the present invention. Based on the explanations herein, those skilled in the art will be able to conceive of other specific implementations of the embodiments of the present invention without inventive effort, and such implementations will fall within the scope of protection of the embodiments of the present invention.

Claims

1. A battery pole piece infrared hot air combined drying system, characterized in that: The invention comprises a drying oven device (1) and an air circulation device (2). The drying oven device (1) comprises a drying box body. Both ends of the drying box body are respectively connected to the air circulation device (2). The air circulation device (2) is used to circulate air in the drying oven device (1). An infrared drying device and a weighing device are arranged in the drying box body. The battery electrode to be dried is arranged on the weighing device. A hot air drying device is arranged on the circulation pipe of the air circulation device (2).

2. The battery pole piece infrared hot air combined drying system according to claim 1, characterized in that: The left and right ends of the drying box are respectively provided with an air inlet (101) and an air outlet (102), the air inlet (101) and the air outlet (102) are respectively connected to the air outlet and the air inlet of the air circulation device, and the drying box is also provided with a visual window (103); the upper end of the drying box is provided with a top plate (104), and the drying box is provided with a gas concentration detector (105) and an infrared temperature probe (106).

3. The battery pole piece infrared hot air combined drying system according to claim 2, characterized in that: The visual window (103) is connected to the drying box body via a hinge; and the top plate (104) is connected to the drying box body via a buckle lock.

4. The battery pole piece infrared hot air combined drying system according to claim 1, characterized in that: The weighing device comprises a tray (113), a weighing scale (110) is provided at the bottom of the tray (113), an infrared lamp (109) is provided at the upper end of the tray (113), the tray (113) is located in a drying box, and the weighing scale (110) is located at the bottom of the drying box; the tray (113) is connected to the weighing rod of the weighing scale (110) via a connecting rod (114).

5. The battery pole piece infrared hot air combined drying system according to claim 4, characterized in that: The infrared lamp tube (109) is fixedly installed via a lamp holder (108), and the lamp holder (108) is installed via a lifting motor (107). The lifting motor (107) is used to control the lifting of the lamp holder (108).

6. The battery pole piece infrared hot air combined drying system according to claim 1, characterized in that: The air circulation device (2) includes an air heater (202) and a centrifugal fan (204); the oven device (1), the air heater (202) and the centrifugal fan (204) are connected via a pipeline (201); the air heater (202) is connected to the oven air inlet (101) to provide heat for the air entering the oven; a valve (203) is provided at the oven air outlet (102); an orifice flowmeter (205) is provided on the pipeline (201), and an activated carbon adsorption box (206) is connected to the pipeline (201).

7. The battery pole piece infrared hot air combined drying system according to claim 1, characterized in that: The device further comprises a control device (3) and a data acquisition device (4). The control device (3) is used to adjust the hot air temperature, hot air flow, the distance between the infrared lamp and the battery electrode, and the heating power. The data acquisition device (4) collects and stores real-time data on the parameters of the electrode quality, temperature, oven humidity, and device energy consumption during the drying process.

8. The battery pole piece infrared hot air combined drying system according to claim 1, characterized in that: The lamp frame (108) adopts a frame structure, and two oppositely arranged frames of the lamp frame (108) are provided with slide rails. Sliders capable of being connected to the slide rails are provided at both ends of the infrared lamp tube (109), and a lead screw for adjusting the sliding of the slide rails is provided on the slide rails.

9. The battery pole piece infrared hot air combined drying system according to claim 1, characterized in that: The device for realizing gas detection comprises a gas concentration detector (105), which is distributed at the upper air vent and the lower air vent on the top of the box body and is used to detect the concentration of organic matter volatilization when the battery electrode is dried.

10. A method for drying battery pole pieces by combining infrared and hot air based on the system of claim 1, characterized in that: The following steps are involved: Place the coated electrode in the oven device; Turn on the air circulation device to dry the electrode in the oven device, adjust the gas flow rate and temperature of the air circulation device according to the drying requirements, and obtain the temperature changes on the electrode surface and in the oven, as well as the electrode quality. Changes in the temperature, energy consumption of the device, and humidity in the oven are monitored until drying is completed, and drying is terminated after natural cooling.

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