Pole piece drying device

Abstract

The utility model relates to a kind of pole piece drying device, for drying pole piece, pole piece includes multiple areas arranged in turn along its width direction, pole piece drying device includes transmission unit, whole drying unit and local drying unit, transmission unit includes unwinding mechanism, multiple guide roller mechanism and winding mechanism;Whole drying unit simultaneously carries out drying to multiple areas of pole piece, local drying unit includes humidity detection mechanism and zoned drying mechanism, humidity detection mechanism includes multiple humidity detection elements, multiple humidity detection elements are respectively corresponding with multiple areas of pole piece, multiple humidity detection elements detect the humidity of the area of corresponding pole piece, zoned drying mechanism includes multiple local drying elements, multiple local drying elements are respectively corresponding with multiple areas of pole piece and independently work respectively, and local drying element according to the humidity of the area of corresponding pole piece dries the area of corresponding pole piece to preset humidity.The utility model can guarantee pole piece drying qualified.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to an electrode drying device. Background Technology

[0002] Electrode drying is a crucial step in lithium battery manufacturing. Currently, there are two main methods for electrode drying: the first involves heating the battery cell using a thermal radiation method after the electrodes are wound into a bare cell and welded into the casing, combined with low-vacuum drying of the electrodes; the second involves direct drying of the rolled material, which can be divided into unwinding drying and whole-roll drying. Unwinding drying uses hot air circulation to unwind the die-cut electrodes from the roll, and the unwound roll enters the drying zone through a tunnel furnace for heating. However, during the electrode drying process, due to differences in electrode thickness and moisture content, some areas of the dried electrode may not be properly dried. Ensuring the proper drying of battery electrodes is a pressing technical problem that needs to be solved in this field. Utility Model Content

[0003] Therefore, this utility model provides an electrode drying device that can ensure the electrode drying is qualified.

[0004] To solve the above-mentioned technical problems, this utility model provides an electrode drying device for drying electrode sheets, wherein the electrode sheet includes multiple regions arranged sequentially along its width direction, and the electrode drying device includes: The transmission unit includes an unwinding mechanism, multiple guide roller mechanisms, and a winding mechanism. The unwinding mechanism is used to carry the electrode roll and unwind the electrode roll. The multiple guide roller mechanisms are used to receive the electrode rolls released by the unwinding mechanism and guide the electrode rolls to pass through the overall drying zone and the local drying zone sequentially along a preset path. The winding mechanism is used to receive the electrode rolls output by the multiple guide roller mechanisms and wind up the electrode rolls. An integrated drying unit is located in the integrated drying area to simultaneously dry multiple areas of the electrode sheet; A local drying unit, located in the local drying area, includes a humidity detection mechanism and a zone drying mechanism arranged sequentially along the traveling direction of the electrode through the local drying area. The humidity detection mechanism includes multiple humidity detection elements, each corresponding to a multiple region of the electrode. The multiple humidity detection elements detect the humidity of the corresponding region of the electrode. The zone drying mechanism includes multiple local drying elements, each corresponding to a multiple region of the electrode and operating independently. The local drying elements dry the corresponding region of the electrode to a preset humidity based on the humidity of that region.

[0005] Furthermore, the humidity detection mechanism is an infrared humidity detection mechanism.

[0006] Furthermore, the partitioned drying mechanism is a hot air drying mechanism, and the wind speed of the partitioned drying mechanism is 9-11 m / s.

[0007] Furthermore, the local drying unit includes multiple partition drying mechanisms arranged sequentially along the traveling direction of the electrode sheet passing through the local drying area, and multiple local drying elements of the same partition drying mechanism are arranged sequentially along the width direction of the electrode sheet passing through the local drying area.

[0008] Furthermore, the drying device includes two local drying units, which are respectively located on both sides of the electrode thickness direction passing through the local drying zone.

[0009] Furthermore, the overall drying unit includes a first overall drying mechanism, a temperature detection mechanism, and a second overall drying mechanism arranged sequentially along the traveling direction of the electrode sheet passing through the overall drying area. The first overall drying mechanism dries multiple areas of the electrode sheet under the same drying conditions. The temperature detection mechanism detects the electrode sheet. The second overall drying mechanism dries multiple areas of the electrode sheet under the same drying conditions according to the temperature of the electrode sheet.

[0010] Furthermore, the first integral drying mechanism is an infrared drying mechanism.

[0011] Furthermore, the second integrated drying mechanism is a hot air drying mechanism, and the wind speed of the second integrated drying mechanism is 7-9 m / s.

[0012] Furthermore, the overall drying unit includes a plurality of first overall drying mechanisms arranged sequentially along the travel direction of the electrode passing through the overall drying zone.

[0013] Furthermore, the overall drying unit includes a plurality of second overall drying mechanisms arranged sequentially along the travel direction of the electrode sheets passing through the overall drying zone.

[0014] Compared with the prior art, the above-mentioned technical solution of this utility model has the following advantages: The electrode drying device of this utility model uses an unwinding method for heating the electrode, and dries the electrode through an overall drying unit and a local drying unit. The overall drying unit can quickly and effectively dry the electrode as a whole. In the local drying unit, the zoned drying mechanism, based on the detection results of the humidity detection mechanism, performs targeted local drying on areas of the electrode that have not met the drying requirements. On the one hand, this avoids the problem of inadequate drying in certain areas of the electrode; on the other hand, it avoids the problem of over-drying the electrode, which could lead to damage. This device has the advantages of improving drying uniformity, avoiding over-drying or under-drying in certain areas, and improving product quality. Attached Figure Description

[0015] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0016] Figure 1 This is a front view of the electrode drying device of this utility model; Figure 2 This is a top view of a humidity detection mechanism in this utility model; Figure 3 This is a top view of a partial drying mechanism in this utility model; Figure 4 This is a schematic diagram of the local drying element in this utility model.

[0017] Explanation of reference numerals in the accompanying drawings: 1. Electrode; 21. Unwinding mechanism; 22. Guide roller mechanism; 23. Rewinding mechanism; 3. Overall drying unit; 31. First overall drying mechanism; 32. Temperature detection mechanism; 33. Second overall drying mechanism; 4. Local drying unit; 41. Humidity detection mechanism; 411. Humidity detection element; 42. Zoned drying mechanism; 421. Local drying element; 4211. Air inlet; 4212. Air outlet. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0019] See Figures 1 to 4 The present invention provides an embodiment of a battery electrode drying apparatus.

[0020] An electrode drying apparatus is used to dry an electrode 1, wherein the electrode 1 includes a plurality of regions arranged sequentially along its width direction, and the electrode drying apparatus includes: The transmission unit includes an unwinding mechanism 21, multiple guide roller mechanisms 22, and a winding mechanism 23. The unwinding mechanism 21 is used to carry the electrode roll and unwind the electrode roll. The multiple guide roller mechanisms 22 are used to receive the electrode 1 released by the unwinding mechanism 21 and guide the electrode 1 to pass through the overall drying area and the local drying area sequentially along a preset path. The winding mechanism 23 is used to receive the electrode 1 output by the multiple guide roller mechanisms 22 and wind the electrode 1. The overall drying unit 3 is located in the overall drying area and simultaneously dries multiple areas of the electrode 1. The local drying unit 4, located in the aforementioned local drying area, includes a humidity detection mechanism 41 and a partition drying mechanism 42 arranged sequentially along the traveling direction of the electrode passing through the local drying area. The humidity detection mechanism 41 includes multiple humidity detection elements 411, which correspond to multiple areas of the electrode 1 and detect the humidity of the corresponding area of ​​the electrode 1. The partition drying mechanism 42 includes multiple local drying elements 421, which correspond to multiple areas of the electrode 1 and operate independently. The local drying elements 421 dry the corresponding area of ​​the electrode 1 to a preset humidity based on the humidity of the corresponding area of ​​the electrode 1.

[0021] In the above description, the unwinding mechanism 21, as the starting point of the entire process, is responsible for carrying and unwinding the electrode roll, providing a continuous supply of electrode material for subsequent processing. Multiple guide roller mechanisms 22 serve as intermediate transport and path guides, receiving the electrode 1 released from the unwinding mechanism and guiding it sequentially through the overall drying zone and local drying zones via a preset guide path, ensuring the electrode completes the drying process according to process requirements. The rewinding mechanism 23, as the end point of the process, receives the processed electrode 1 output from the guide roller mechanisms and rewinds it into a roll for subsequent storage, transportation, or further processing. Through the coordinated work of the unwinding mechanism 21, guide roller mechanism 22, and rewinding mechanism 23, an automated process is achieved from the electrode roll state to rewinding after specific processing. The guide roller mechanism ensures stable transport of the electrode along a predetermined route during processing. The overall drying unit 3 can dry all areas of the electrode 1 with the same operating parameters. As the first drying process, it can quickly reduce the overall humidity of the electrode, laying the foundation for subsequent local fine drying and improving overall drying efficiency. The local drying unit 4 can independently dry specific areas of the electrode. Humidity detection element 411 detects the humidity of each area of ​​the electrode, and controls the activation status and operating parameters of each local drying element 421 based on the humidity of each area. The local drying element 421 targets areas with excessive humidity; for example, if the humidity on the left side of the electrode is higher than a preset value, only the corresponding local drying element on the left side is activated until the humidity in that area reaches the standard. After passing through the electrode drying device, the moisture content of the electrode is maintained within the range of 0.3‰ to 0.6‰.

[0022] Specifically, electrode 1, guided by the transmission unit, first passes through the overall drying zone, undergoing comprehensive and uniform drying. Upon entering the localized drying zone, the humidity detection mechanism 41 scans the moisture content of each area in real time and transmits the data to the control system. The zoned drying mechanism 42 automatically adjusts the start / stop and operating parameters of the corresponding localized drying elements 421 based on the measured humidity values ​​of each area. For areas with high humidity, the hot air flow rate is increased or the heating power is raised; for areas that have reached the required humidity, the drying process is either stopped or the drying intensity is reduced to avoid over-drying. This drying mode ensures both basic drying efficiency and differentiated elimination of residual moisture.

[0023] Through the above technical solution, the electrode sheet is heated by unwinding and dried through a general drying unit and a local drying unit. The general drying unit can quickly and effectively dry the electrode sheet as a whole. In the local drying unit, the zoned drying mechanism performs targeted local drying on areas of the electrode sheet that have not met the drying requirements based on the detection results of the humidity detection mechanism. On the one hand, this avoids the problem of inadequate drying in some areas of the electrode sheet; on the other hand, it avoids the problem of over-drying and damage to the electrode sheet. It has the advantages of improving drying uniformity, avoiding over-drying or under-drying in some areas, and improving product quality.

[0024] In this embodiment, the humidity detection mechanism 41 is an infrared humidity detection mechanism.

[0025] In the above text, the infrared humidity detection mechanism refers to a device that analyzes the humidity distribution by receiving changes in the infrared spectrum reflected from the surface of the electrode. Specifically, it can be implemented using a detection head with an infrared emitter and a spectral analysis module, and the moisture content of the material can be determined by the differences in the absorption characteristics of infrared rays of different wavelengths.

[0026] Specifically, the humidity detection element 411 is configured to maintain a fixed distance from each area of ​​the electrode 1. During continuous electrode transport, an infrared light source illuminates the electrode surface at a specific wavelength, and the reflected light is collected by an optical sensor and transmitted to the spectral analysis module. When there are humidity differences in different areas of the electrode, the degree of absorption of water molecules in specific infrared bands changes, resulting in a shift in the reflectance spectral characteristics. By establishing a model corresponding to the humidity value and the spectral shift, the actual humidity value at each detection point can be calculated in real time. The detection data is transmitted to the zoned drying mechanism 42 through a closed-loop control system, enabling dynamic adjustment of drying parameters.

[0027] The above technical solution, using non-contact detection via infrared spectroscopy, not only eliminates the risk of mechanical contact but also achieves high detection accuracy.

[0028] In this embodiment, the above-mentioned zoned drying mechanism 42 is a hot air drying mechanism, and the wind speed of the above-mentioned hot air drying mechanism is 9-11 m / s.

[0029] In the above text, the hot air drying mechanism refers to a device that dries the electrode sheet by generating an airflow with controllable temperature and velocity. The airflow velocity of 9-11 m / s refers to the average speed range of the hot air flowing over the electrode sheet surface. This range provides sufficient kinetic energy to penetrate the electrode sheet coating structure while preventing the coating from peeling off due to airflow impact. The airflow velocity of the aforementioned hot air drying mechanism is, for example, 9 m / s, 10 m / s, or 11 m / s.

[0030] Specifically, the local drying element 421 has an air inlet 4211 and an air outlet 4212, with the air outlet facing the electrode. When the humidity detection element 411 of the humidity detection mechanism 41 detects that the humidity in a certain area of ​​the electrode is higher than a preset value, the corresponding local drying element 421 starts to output hot air. The hot air is blown directionally into the area, accelerating moisture evaporation through forced convection.

[0031] Through the above technical solution, the zoned drying mechanism adopts hot air drying, which makes it easier to control the direction of hot air flow and achieve localized drying of the electrode sheets.

[0032] In this embodiment, the aforementioned local drying unit 4 includes a plurality of partition drying mechanisms 42 arranged sequentially along the traveling direction of the electrode 1 passing through the aforementioned local drying area, and a plurality of local drying elements 421 of the same partition drying mechanism 42 are arranged sequentially along the width direction of the electrode 1 passing through the aforementioned local drying area.

[0033] In the above description, multiple guide roller mechanisms 22 guide the electrode sheet 1 along an S-shaped trajectory. In the local drying zone, the electrode sheet does not move in a straight line, but instead passes through multiple sets of guide roller mechanisms arranged vertically and horizontally, forming a continuous S-shaped trajectory. This can significantly extend the residence time of the electrode sheet in the local drying zone within a limited equipment space. To accommodate the travel trajectory of the electrode sheet, multiple zone drying mechanisms 42 are set up, and each position of the electrode sheet passes through each zone drying mechanism 42 at a certain speed.

[0034] Through the above technical solution, on the one hand, the superposition effect of the longitudinal multi-level zone drying mechanism extends the effective drying time and can adapt to the S-shaped travel trajectory of the electrode; on the other hand, multiple local drying elements arranged sequentially along the travel direction of the electrode and drying the same area of ​​the electrode can be partially or fully turned on according to the humidity of the corresponding area, thereby improving the accuracy of electrode drying.

[0035] In this embodiment, the drying device includes two local drying units 4, which are respectively located on both sides of the electrode 1 in the thickness direction passing through the local drying area.

[0036] In the above description, local drying units are set on both sides of the electrode 1 along its thickness direction. When the electrode passes through the local drying area along the transport path, its upper and lower surfaces are exposed within the effective range of two independently controlled local drying units 4. Each local drying unit 4 independently adjusts its drying intensity and operating mode based on the corresponding surface humidity detection data. This bidirectional symmetrical drying structure overcomes the limitations of the internal moisture migration path of the electrode during traditional single-sided drying. By using bidirectional synchronous drying, it offsets the interlayer thermal conduction resistance of the electrode material, making the moisture evaporation rate of each layer in the electrode thickness direction tend to be consistent. During implementation, humidity detection elements located on the upper and lower surfaces of the electrode collect surface humidity data in real time, and the control system adjusts the operating state of the local drying units 4 on both sides accordingly.

[0037] Through the above technical solution, bidirectional heat conduction in the thickness direction is achieved during the electrode's movement by simultaneously drying both sides, effectively eliminating the hindering effect of the electrode's layered structure on moisture evaporation and avoiding the phenomenon of internal humidity lag caused by insufficient drying on one side.

[0038] In this embodiment, the overall drying unit 3 includes a first overall drying mechanism 31, a temperature detection mechanism 32, and a second overall drying mechanism 33 arranged sequentially along the traveling direction of the electrode 1 passing through the overall drying area. The first overall drying mechanism 31 dries multiple areas of the electrode 1 under the same drying conditions. The temperature detection mechanism 32 detects the electrode 1. The second overall drying mechanism 33 dries multiple areas of the electrode 1 under the same drying conditions according to the temperature of the electrode 1.

[0039] In the above text, the first overall drying mechanism 31 refers to a device that applies the same initial drying conditions to all areas of the electrode. The temperature detection mechanism 32 refers to a device that monitors the surface temperature distribution of the electrode in real time, used to identify local temperature deviations caused by differences in material thermal conductivity. The second overall drying mechanism 33 refers to a device that dynamically adjusts the drying intensity based on the temperature detection results, adjusting parameters to adapt the overall drying conditions to the actual temperature of the electrode.

[0040] Specifically, electrode 1 first undergoes preliminary uniform drying via the first integrated drying mechanism 31 to eliminate the impact of initial humidity differences. Subsequently, the temperature detection mechanism 32 detects the surface temperature of the electrode, and the second integrated drying mechanism 33 adjusts the drying parameters based on the detected temperature to further dry the electrode, thereby increasing the surface temperature of the electrode in one step. This prevents the problem of the second integrated drying mechanism 33's temperature being lower than that of electrode 1, thus ensuring effective drying of the electrode.

[0041] The above technical solution involves two-stage overall drying, with a temperature detection mechanism set between the two stages. The second overall drying mechanism 33 adjusts the drying parameters in real time according to the temperature, so that the second overall drying mechanism 33 can effectively dry the electrode sheet.

[0042] In this embodiment, the first overall drying mechanism 31 is an infrared drying mechanism.

[0043] In the above text, the infrared drying mechanism refers to a device that uses infrared radiation to heat the electrode sheet, specifically through an array of infrared emitters. Infrared radiation has strong penetrating power, allowing it to directly act on the interior of the electrode sheet, ensuring that all areas of the electrode sheet are heated simultaneously. This non-contact heating method avoids the surface temperature gradient caused by traditional heat conduction, thus ensuring uniform heating of the electrode sheet throughout the initial drying stage.

[0044] Specifically, the infrared drying mechanism emits infrared rays of a specific wavelength during operation. The electrode material absorbs the radiant energy and converts it into heat, causing rapid evaporation of moisture. Since the infrared energy distribution can be optimized through the emitter layout, the radiation intensity received by each area along the width of the electrode tends to be uniform, avoiding uneven drying caused by insufficient or excessive heating in certain areas. This method rapidly reduces the overall humidity of the electrode in the initial drying stage, providing a stable detection benchmark for the subsequent temperature detection mechanism, allowing the second overall drying mechanism 33 to adjust drying parameters based on accurate data.

[0045] Through the above technical solution, the first overall drying mechanism is an infrared drying mechanism, which directly penetrates the electrode sheet in a non-contact manner, resulting in higher energy transfer efficiency, shorter heating time, and the ability to achieve rapid and precise drying.

[0046] In this embodiment, the second integrated drying mechanism 33 is a hot air drying mechanism, and the wind speed of the second integrated drying mechanism 33 is 7-9 m / s.

[0047] In the above text, the hot air drying mechanism refers to a drying device that transfers heat through forced convection, utilizing the airflow circulation characteristics to eliminate temperature differences on the electrode surface. The wind speed range of 7-9 m / s refers to the optimized range of hot air flow velocity. This parameter range satisfies the heat exchange efficiency requirements while avoiding airflow impact that could cause the electrode tabs to fold. The wind speed of the aforementioned second integral drying mechanism 33 is, for example, 9 m / s, 10 m / s, or 11 m / s.

[0048] Specifically, after the electrode sheet is heated by infrared radiation by the first integrated drying mechanism 31, the second integrated drying mechanism 33 heats the electrode sheet by blowing out dried air at a temperature higher than that of the heated electrode sheet, ensuring that the electrode sheet can be effectively dried.

[0049] Through the above technical solution, the second overall drying mechanism is a hot air drying mechanism. On the one hand, the air blowing heating can provide a stable heating source to ensure the temperature uniformity of electrode heating and drying; on the other hand, the air blowing heating is easy to integrate with the automatic control system, and the airflow size can be controlled by valves to realize remote monitoring and automatic adjustment, thereby improving production efficiency and consistency; third, the gas after heating the electrode can be recycled, resulting in low operating costs; fourth, the air blowing heating process is free of open flames and smoke, making it environmentally friendly and suitable for the workshop environment.

[0050] In this embodiment, the overall drying unit 3 includes a plurality of first overall drying mechanisms 31 arranged sequentially along the travel direction of the electrode 1 passing through the overall drying area. The overall drying unit 3 also includes a plurality of second overall drying mechanisms 33 arranged sequentially along the travel direction of the electrode 1 passing through the overall drying area.

[0051] In the above description, multiple guide roller mechanisms 22 guide the electrode sheet 1 along an S-shaped trajectory. In the overall drying zone, the electrode sheet does not move in a straight line, but instead passes through multiple sets of vertically staggered guide roller mechanisms 22, forming a continuous S-shaped trajectory. This significantly extends the residence time of the electrode sheet in the overall drying zone within the limited equipment space. To accommodate the electrode sheet's trajectory, multiple first overall drying mechanisms 31 and multiple second overall drying mechanisms are provided. Each position of the electrode sheet passes through each first overall drying mechanism 31 and each second overall drying mechanism at a certain speed.

[0052] Through the above technical solution, the superposition of the longitudinal multi-stage first integral drying mechanism and the multi-stage second integral drying mechanism extends the effective drying time and can adapt to the S-shaped travel trajectory of the electrode sheet.

[0053] Example 1: The electrode 1 passes through multiple first integral drying mechanisms 31, temperature detection mechanism 32, multiple second integral drying mechanisms 33, humidity detection mechanism 41 and multiple zone drying mechanisms 42 in sequence.

[0054] The first overall drying mechanism 31 is an infrared drying mechanism, while the second overall drying mechanism 33 and the zoned drying mechanism 42 are both hot air drying mechanisms.

[0055] The first integrated drying mechanism 31 heats the electrode sheets to a specified temperature by controlling the power of the infrared drying mechanism, using infrared heating. The infrared heater enables rapid heating, heating the electrode sheets that have passed through the rollers to 50±5℃ via the infrared drying mechanism. Infrared heating has relatively high temperature accuracy, enabling precise heating of the electrode sheets.

[0056] The temperature detection mechanism monitors the electrode temperature, provides real-time feedback on the electrode temperature, and uploads it to the PLC. If the electrode temperature is below 45℃, the second integrated drying mechanism increases the air volume; if the electrode temperature is above 55℃, the second integrated drying mechanism decreases the air volume.

[0057] The second integrated drying mechanism 33 is an air-blowing heating mechanism. Each section of the air-blowing mechanism blows out high-temperature gas to heat the electrode sheet. The second integrated drying mechanism blows the high-temperature gas from the non-tab side of the electrode sheet to prevent the electrode tabs from folding or flipping after being heated by the gas. By blowing out dried gas at a temperature of 300℃, the electrode sheet is heated and dried. The hot air circulation removes residual moisture from the electrode sheet, achieving the desired drying effect. The air-blowing heating method has high heat exchange efficiency, which can quickly transfer heat to the electrode sheet. At the same time, the blown dry, high-temperature air can quickly evaporate the residual moisture on the electrode sheet, further reducing the moisture content of the electrode sheet.

[0058] The humidity detection unit 41 is an infrared moisture analyzer, which monitors the dryness of the electrode sheets by region and detects their moisture content. The electrode sheets are divided into regions, and the moisture content within each region is determined and fed back to the PLC. The moisture content levels of the electrode sheets are divided into three ranges: 0.6‰~3‰, 3‰~5‰, and greater than 5‰. Vision software further divides the electrode sheet regions with different moisture contents, enabling the micro-airflow heating mechanism to react promptly and adjust the heating time and temperature when the electrode sheets pass through it.

[0059] The zoned drying mechanism is a micro-airflow heating mechanism that blows micro-airflows point-to-point onto the electrode sheets. In the preceding monitoring area, the dryness level of each part of the electrode sheet is fed back to the PLC. After analyzing the dryness level of the electrode sheet, the PLC sends a feedback signal to the micro-airflow heating mechanism, which heats the electrode sheets in zones, adjusting the heating temperature according to the different dryness levels of the electrode sheets to achieve the same drying effect for electrodes with different dryness levels.

[0060] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. An electrode drying apparatus for drying an electrode (1), the electrode (1) comprising a plurality of regions arranged sequentially along its width direction, characterized in that... The electrode drying device includes: The transmission unit includes an unwinding mechanism (21), multiple guide roller mechanisms (22), and a winding mechanism (23). The unwinding mechanism (21) is used to carry the electrode roll and unwind the electrode roll. The multiple guide roller mechanisms (22) are used to receive the electrode (1) released by the unwinding mechanism (21) and guide the electrode (1) to pass through the overall drying area and the local drying area sequentially along a preset path. The winding mechanism (23) is used to receive the electrode (1) output by the multiple guide roller mechanisms (22) and wind up the electrode (1). An overall drying unit (3) is located in the overall drying area to simultaneously dry multiple areas of the electrode (1); A local drying unit (4) is provided in the local drying area and includes a humidity detection mechanism (41) and a partition drying mechanism (42) arranged sequentially along the traveling direction of the electrode in the local drying area. The humidity detection mechanism (41) includes multiple humidity detection elements (411), which correspond to multiple areas of the electrode (1) respectively. The multiple humidity detection elements (411) detect the humidity of the corresponding area of ​​the electrode (1). The partition drying mechanism (42) includes multiple local drying elements (421), which correspond to multiple areas of the electrode (1) respectively and work independently. The local drying elements (421) dry the corresponding area of ​​the electrode (1) to a preset humidity according to the humidity of the corresponding area of ​​the electrode (1).

2. The drying apparatus according to claim 1, characterized in that, The humidity detection mechanism (41) is an infrared humidity detection mechanism.

3. The drying apparatus according to claim 1, characterized in that, The partitioned drying mechanism (42) is a hot air drying mechanism, and the wind speed of the partitioned drying mechanism (42) is 9-11 m / s.

4. The drying apparatus according to claim 1, characterized in that, The local drying unit (4) includes a plurality of partition drying mechanisms (42) arranged sequentially along the traveling direction of the electrode (1) passing through the local drying area, and a plurality of local drying elements (421) of the same partition drying mechanism (42) are arranged sequentially along the width direction of the electrode (1) passing through the local drying area.

5. The drying apparatus according to claim 1, characterized in that, The drying device includes two local drying units (4), which are respectively located on both sides of the electrode (1) passing through the local drying area in the thickness direction.

6. The drying apparatus according to claim 1, characterized in that, The overall drying unit (3) includes a first overall drying mechanism (31), a temperature detection mechanism (32) and a second overall drying mechanism (33) arranged sequentially along the traveling direction of the electrode (1) passing through the overall drying area. The first overall drying mechanism (31) dries multiple areas of the electrode (1) under the same drying conditions. The temperature detection mechanism (32) detects the electrode (1). The second overall drying mechanism (33) dries multiple areas of the electrode (1) under the same drying conditions according to the temperature of the electrode (1).

7. The drying apparatus according to claim 6, characterized in that, The first overall drying mechanism (31) is an infrared drying mechanism.

8. The drying apparatus according to claim 6, characterized in that, The second integrated drying mechanism (33) is a hot air drying mechanism, and the wind speed of the second integrated drying mechanism (33) is 7-9 m / s.

9. The drying apparatus according to claim 6, characterized in that, The overall drying unit (3) includes a plurality of first overall drying mechanisms (31) arranged sequentially along the traveling direction of the electrode (1) passing through the overall drying zone.

10. The drying apparatus according to claim 6, characterized in that, The overall drying unit (3) includes a plurality of second overall drying mechanisms (33) arranged sequentially along the traveling direction of the electrode (1) passing through the overall drying zone.

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