Drying equipment

Abstract

This utility model relates to the field of battery manufacturing technology and discloses a drying device, including an oven and a fresh air module. The oven has a drying channel for passing electrode sheets, and a heating module is installed inside the oven to heat the drying channel to reach a preset temperature. The fresh air module includes an air inlet duct and a heat exchanger. The heat exchanger is connected to the air inlet duct and is used to exchange heat with the fresh air in the air inlet duct. The oven has an air inlet, a return air inlet, and an exhaust air outlet. The air inlet is connected to the heat exchanger, and the return air inlet is connected to the air inlet duct. The fresh air, after being heated by the heat exchanger, enters the oven through the air inlet. Part of the gas in the drying channel flows into the air inlet duct through the return air inlet, and the other part of the gas in the drying channel is discharged from the oven through the exhaust air outlet. The heating power P of the heating module and the air volume V of the air inlet satisfy the following relationship: 8 kW * m³. 3 / h≤P*V*10 ‑5 ≤68kw*m 3 / h.

Description

Technical Field

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

[0002] After the electrode surface is coated with the slurry, it needs to be dried in an oven to remove moisture and solidify, adhering to the electrode. Currently, when drying electrodes in an oven, infrared lamps are typically installed inside, and fresh air from outside is circulated within the oven. The combination of the infrared lamps and fresh air helps to bake the electrodes. However, if the temperature inside the oven is not well controlled, the drying effect can be poor. Furthermore, the direct exhaust of fresh air after passing over the electrodes results in energy waste. Utility Model Content

[0003] To address the issues of poor electrode drying performance and energy waste, this invention proposes a drying device that ensures effective electrode drying while reducing energy consumption.

[0004] To achieve the above objectives, the technical solution of the drying equipment in this utility model is as follows:

[0005] A drying device, comprising an oven and a fresh air module;

[0006] The oven has a drying channel for passing the electrode sheets, and a heating module is provided inside the oven to heat the drying channel so that the temperature in the drying channel reaches a preset temperature value.

[0007] The fresh air module includes an air inlet duct and a heat exchange device. The heat exchange device is connected to the air inlet duct and is used to exchange heat with the fresh air in the air inlet duct.

[0008] The oven is provided with an air inlet, a return air inlet and an exhaust air outlet. The air inlet is connected to the heat exchange device, and the return air inlet is connected to the air inlet pipe. Fresh air after heat exchange by the heat exchange device enters the oven through the air inlet. A portion of the gas in the drying channel flows into the air inlet pipe through the return air inlet, and another portion of the gas in the drying channel is discharged from the oven through the exhaust air outlet.

[0009] The heating power P of the heating module and the air intake V of the air inlet satisfy the following relationship: 8kW*m 3 / h≤P*V*10 -5 ≤68kw*m 3 / h.

[0010] The above technical solution has the following advantages or beneficial effects: By setting a return air vent in the drying oven, which is connected to the inlet air duct, a portion of the fresh air exchanging heat with the electrodes inside the oven can escape through the exhaust vent, while the other portion can return to the inlet air duct through the return air vent and mix with the fresh air entering the inlet air duct from the outside. This not only reduces the amount of fresh air entering the inlet air duct from the outside but also reduces the amount of heat exchanged between the heat exchange device and the fresh air, which helps to reduce energy consumption and production costs. By limiting the heating power of the heating module and the area of ​​the air inlet, the temperature inside the oven can be kept stable within a suitable range, thereby ensuring the drying effect of the electrodes. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of a drying device in an embodiment of the present utility model;

[0012] Figure 2 This is a top view of the top of the oven in an embodiment of this utility model;

[0013] Figure 3 This is another structural schematic diagram of the heating module inside the oven in this embodiment of the present invention.

[0014] In the picture:

[0015] 100-Oven; 101-Drying channel; 110-Air inlet; 120-Return air inlet; 130-Exhaust air outlet; 200-Heating module; 210-First heating component; 211-First heating module; 220-Second heating component; 221-Second heating module; 300-Fresh air module; 310-Air inlet duct; 320-Heat exchange device; 330-Fresh air main duct; 340-Fresh air branch duct; 350-Return air duct; 400-Exhaust air duct. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] After the electrode sheet is coated with the slurry, it enters the drying oven through the inlet, is transferred within the oven using a conveyor system, and exits through the outlet. During this transfer process, the high temperature and negative pressure inside the oven remove moisture from the slurry, causing it to solidify and adhere to the electrode sheet. If the oven temperature is insufficient or excessively high during the drying process, the drying effect will be poor, thus affecting the quality of the electrode sheet.

[0018] Furthermore, current methods for drying electrodes typically involve installing infrared lamps inside the drying oven to heat the interior. Simultaneously, fresh air is introduced into the oven, and its flow helps dry the electrodes. However, after drying the electrodes, the treated fresh air is directly exhausted from the oven, resulting in high energy consumption and hindering cost reduction.

[0019] Based on this, the present invention provides a drying device to solve the problems of poor electrode drying effect and high energy consumption. The drying device will be described in detail below with reference to specific embodiments.

[0020] refer to Figure 1 The drying equipment in this embodiment may include an oven 100 and a fresh air module 300. The oven 100 may have an inlet and an outlet, and the interior of the oven 100 is provided with a drying channel 101. The electrode sheet can enter the interior of the oven 100 through the inlet and extend along the extending direction of the drying channel 101. Figure 1 After moving (in the direction indicated by the middle arrow), it leaves the oven 100 through the outlet.

[0021] The oven 100 may also be equipped with a heating module 200, which can be used to heat the drying channel 101 so that the temperature in the drying channel 101 reaches the preset temperature value, thereby maintaining the high temperature state inside the oven 100.

[0022] The fresh air module 300 may include an air inlet duct 310 and a heat exchange device 320, which is connected to the air inlet duct 310. External fresh air can flow from the air inlet duct 310 to the heat exchange device 320, which is used to exchange heat with the fresh air to heat it up and raise its temperature.

[0023] The oven 100 may also be equipped with an air inlet 110, a return air inlet 120, and an exhaust air outlet 130. The air inlet 110 is connected to the heat exchanger 320. Fresh air, after heat exchange with the heat exchanger 320, enters the oven 100 through the air inlet 110. The high-temperature fresh air flows through the drying channel 101, thereby drying the electrode sheets. The return air inlet 120 is connected to the air inlet channel, and the exhaust air outlet 130 is connected to the external environment of the oven 100. After heat exchange with the electrode sheets, part of the fresh air entering the drying channel 101 is discharged from the oven 100 through the exhaust air outlet 130, while the other part returns to the air inlet duct 310 through the return air inlet 120. The air returning to the air inlet duct 310 through the return air inlet 120 can mix with the fresh air entering the air inlet duct 310 from the outside, and after heat exchange again through the heat exchanger 320, it enters the oven 100, thus allowing some of the fresh air to be recycled.

[0024] Since the temperature of the fresh air after heat exchange via heat exchanger 320 is constant, the temperature of the fresh air entering the intake duct 310 from the outside is low, while the temperature of the air returning to the intake duct 310 from the return air port 120 is high. When these two gases mix, the temperature of the fresh air entering the heat exchanger 320 increases. When the heat exchanger 320 exchanges heat with the fresh air, the amount of heat exchange between the heat exchanger 320 and the fresh air decreases. Thus, the amount of fresh air entering the intake duct 310 from the outside decreases, and the amount of heat exchanged by the heat exchanger 320 decreases, effectively reducing energy consumption and production costs.

[0025] In this embodiment, the heating power P of the heating module 200 and the air intake volume V of the air inlet 110 can satisfy the following condition: 8 kW * m³ / s. 3 / h≤P*V*10 -5 ≤68kw*m 3 / h, here, the air intake volume of the air inlet 110 can be understood as the product of the air intake area of ​​the air inlet 110 and the air velocity. It is understandable that if the value of P*V is too large, it indicates that at least one of the heating power of the heating module 200 and the air intake volume of the air inlet 110 is too large, which can easily lead to excessively high temperatures in the drying channel 101, resulting in cracking of the electrode. Conversely, if the value of P*V is too small, it indicates that at least one of the heating power of the heating module 200 and the air intake volume of the air inlet 110 is too small, resulting in insufficient temperature in the drying channel 101, incomplete removal of moisture from the slurry, poor adhesion between the solid powder and the electrode, and affecting the quality of the electrode. Therefore, controlling the value of P*V within the above range ensures both the drying effect of the electrode and prevents over-drying, thus ensuring the quality of the electrode.

[0026] In this embodiment, the fresh air module 300 may further include a filter device (not shown in the figure). For example, the filter device may be disposed between the heat exchange device 320 and the air inlet duct 310. The fresh air may pass through the filter device before entering the heat exchange device 320. The filter device can filter the fresh air to remove dust, impurities and other substances in the fresh air, ensuring that the fresh air entering the drying channel 101 is in a clean state, thereby preventing impurities from falling onto the electrode surface and affecting the quality of the electrode.

[0027] In some embodiments, continue to refer to Figure 1 The heating module 200 may include a first heating component 210 and a second heating component 220, wherein the first heating component 210 is disposed at the top of the oven 100 and the second heating component 220 is disposed at the bottom of the oven 100. In this case, the drying channel 101 may be located between the first heating component 210 and the second heating component 220, so that the first heating component 210 and the second heating component 220 simultaneously heat the drying channel 101, increasing the rate of temperature rise in the drying channel 101 and helping to maintain the temperature stability in the drying channel 101.

[0028] In practical applications, the first heating module 211 can be, for example, an infrared lamp, and the second heating module 221 can also be, for example, an infrared lamp.

[0029] Furthermore, since both sides of the electrode are coated with slurry, when the electrode passes through the drying channel 101, the slurry-coated sides of the electrode can respectively face the first heating element 210 and the second heating element 220. At this time, the first heating element 210 and the second heating element 220 can dry both sides of the electrode respectively to ensure that the electrode is heated evenly on both sides, so as to achieve a better drying effect.

[0030] In a specific implementation, a conveying device may also be provided inside the drying oven 100. The conveying device may include, for example, at least two conveying rollers, which may be arranged along the extending direction of the drying channel 101 so that the electrode sheet can move along the extending direction of the drying channel 101. In this way, the electrode sheet can move at a uniform speed between the first heating assembly 210 and the second heating assembly 220 to ensure the drying effect of the electrode sheet.

[0031] The first heating assembly 210 may include a plurality of first heating modules 211, which are spaced apart along the extending direction of the drying channel 101. The second heating assembly 220 may include a plurality of second heating modules 221, which are spaced apart along the extending direction of the drying channel 101. Thus, by providing multiple first heating modules 211 and second heating modules 221, the temperature throughout the drying channel 101 can be made uniform, preventing uneven heating of the electrode sheets from affecting the drying effect.

[0032] Furthermore, refer again Figure 1 The air inlet 110 can be located at the top of the oven 100, and there can be multiple air inlets 110 so that fresh air passing through the heat exchange device 320 can enter the oven 100 simultaneously through multiple air inlets 110. This increases the airflow inside the oven 100, thereby improving the heat exchange efficiency between the fresh air and the electrode, and thus improving the drying efficiency of the electrode.

[0033] Furthermore, when the air inlet 110 is located at the top of the oven 100, heat exchange can also occur between the air inlet 110 and the first heating module 211 when fresh air enters the oven 100 through the air inlet 110, so as to adjust the temperature of the first heating module 211 and the fresh air.

[0034] Specifically, when the temperature of the fresh air entering the oven 100 is lower than the temperature of the first heating module 211, the first heating module 211 can reheat the fresh air to increase its temperature, thereby enhancing the drying effect on the electrode sheets.

[0035] Alternatively, when the drying of the electrode sheets in the oven 100 is mainly achieved by heating the first heating module 211, in order to avoid the first heating module 211 becoming too hot and affecting the drying effect, the low-temperature fresh air entering the oven 100 can also cool the first heating module 211. During this process, the heat exchange device 320 exchanges heat with the fresh air, causing the temperature of the fresh air to rise relative to the outside temperature, which helps to prevent condensation from occurring when the fresh air cools the first heating module 211.

[0036] If the temperature of the fresh air is higher than that of the first heating module 211, the fresh air entering the oven 100 can also supplement the heat inside the oven 100 during the drying process of the electrode sheets, thereby raising the overall temperature inside the oven 100 to a certain extent. In this way, even if the power of the first heating module 211 is not very high, it can still ensure that the temperature inside the oven 100 is maintained at the preset temperature value.

[0037] In this case, a temperature sensor can also be installed inside the oven 100 to detect the temperature inside the drying channel 101. When the temperature sensor detects that the temperature in the drying channel 101 has not reached the preset temperature value, the temperature of the fresh air entering the oven 100 can be increased by increasing the heat exchange efficiency of the heat exchange device 320, or the temperature of the first heating module 211 and / or the second heating module 221 can be increased by increasing the power of the first heating module 211 and / or the second heating module 221. When the temperature sensor detects that the temperature in the drying channel 101 exceeds the preset temperature value, the temperature of the fresh air entering the oven 100 can be decreased by decreasing the heat exchange efficiency of the heat exchange device 320, or the temperature of the first heating module 211 and / or the second heating module 221 can be decreased by decreasing the power of the first heating module 211 and / or the second heating module 221.

[0038] In some alternative implementations, combined with Figure 1 and Figure 2 Multiple air inlets 110 can also be arranged at intervals along the extension direction of the drying channel 101, so that a certain distance is maintained between two adjacent air inlets 110. In this way, when fresh air enters the oven 100 from each air inlet 110, it can avoid the gas flow at the air inlet 110 being too turbulent due to the small distance between two adjacent air inlets 110, which would affect the drying effect of the electrode sheets.

[0039] Furthermore, the air inlets 110 and the first heating modules 211 can be distributed in a staggered manner. That is, an air inlet 110 is provided between two adjacent first heating modules 211, and a first heating module 211 is provided between two adjacent air inlets 110. In this way, the staggered distribution of the air inlets 110 and the first heating modules 211 can increase the area of ​​the air inlets 110. While controlling the power of the first heating modules 211, more fresh air can enter the oven 100 to complete the drying of the electrode sheets, which is beneficial to improving work efficiency.

[0040] Based on this, such as Figure 2As shown, in each pair of adjacent air inlets 110 and first heating modules 211, the distance d between the air inlet 110 and the first heating module 211 can be 15mm to 60mm. It is understandable that if the distance d between the air inlet 110 and the first heating module 211 is too large, the heat exchange effect between the first heating module 211 and the fresh air will be poor, affecting the drying effect of the fresh air on the electrode, or affecting the cooling effect of the fresh air on the first heating module 211. Conversely, if the distance d between the air inlet 110 and the first heating module 211 is too small, it means that the distance between two adjacent first heating modules 211 is small. This not only requires more first heating modules 211, leading to increased production costs, but also easily causes the first heating modules 211 to overheat, affecting the drying effect of the electrode. Therefore, controlling the distance d between the air inlet 110 and the first heating module 211 to be between 15mm and 60mm not only ensures the drying effect of the electrode but also helps control production costs.

[0041] It should be noted that when multiple air inlets 110 and heating modules 200 are designed as in the above embodiments, the heating power P of the heating module 200 can be understood as the sum of the power of each first heating module 211 and each second heating module 221, and the air intake V of the air inlet 110 can be understood as the total air intake of all air inlets 110.

[0042] In practical applications, the heating power P of the heating module 200 can meet the following requirements: 200kW ≤ P ≤ 700kW, and the air intake V of the air inlet 110 can meet the following requirement: 4000m³ / h. 3 / h≤V≤10000m 3 / h.

[0043] In this embodiment, refer again Figure 1 The fresh air module 300 may further include a main fresh air duct 330 and multiple branch fresh air ducts 340 corresponding to a plurality of fresh air inlets. A heat exchange device 320 is connected to the main fresh air duct 330 to deliver the heat-exchanged fresh air into the main fresh air duct 330. One end of each branch fresh air duct 340 is connected to the main fresh air duct 330, and the other end is connected to the corresponding air inlet 110, so as to distribute the fresh air in the main fresh air duct 330 evenly into each branch fresh air duct 340, ensuring that the fresh air volume of each air inlet 110 is the same.

[0044] In some embodiments, the air inlet 110 may be provided with a first regulating valve, which can be used to adjust the opening degree of the air inlet 110. As mentioned above, the air intake volume of the air inlet 110 is the product of the area of ​​the air inlet 110 and the wind speed. When the wind speed is constant, the air intake volume of the air inlet 110 depends on the air intake area of ​​the air inlet 110. That is, the air intake area of ​​the air inlet 110 is related to the heating power of the first heating module 211. When facing different production needs, the actual air intake area of ​​the air inlet 110 can be adjusted by using the first regulating valve, so that the value of P*V meets the design requirements.

[0045] In some embodiments, such as Figure 1 or Figure 2 As shown, the number of first heating modules 211 and second heating modules 221 is the same, and each first heating module 211 and the second heating module can be aligned in the extending direction of the drying channel 101.

[0046] In other embodiments, reference is made to Figure 3 Let the projection plane be a plane perpendicular to the arrangement direction of the first heating component 210 and the second heating component 220. Along the extension direction of the drying channel 101, the orthographic projection of the first heating component 210 on the projection plane partially coincides with the orthographic projection of the second heating component 220 on the projection plane. That is, the first heating component 210 and the second heating component 220 are partially staggered. When the first heating module 211 and the second heating module 221 heat the drying channel 101, the number of the first heating module 211 and the second heating module 221 can be reduced, thereby controlling production costs.

[0047] Looking back again Figure 1 Along the extension direction of the drying channel 101, the exhaust port 130 can be located near the outlet of the oven 100. The oven 100 is connected to an exhaust duct 400 so that the gas inside the oven 100 can be discharged through the exhaust duct 400. Since the air inlet 110 is located between the inlet and outlet of the oven 100, the fresh air entering the oven 100 through the air inlet 110 can flow along the moving direction of the electrode and then flow to the exhaust port 130, which helps to improve the drying efficiency of the electrode.

[0048] The return air vent 120 can be located, for example, between the exhaust vent 130 and the air inlet 110. The return air vent 120 is connected to the air inlet duct 310 via a return air duct 350, so that the gas inside the oven 100 can flow back into the air inlet duct 310 through the return air duct 350. In addition, both the return air vent 120 and the exhaust vent 130 can be located, for example, at the top of the oven 100.

[0049] Furthermore, the exhaust vent 130 may also be equipped with a second regulating valve, which is used to adjust the opening degree of the exhaust vent 130. The return air vent 120 may also be equipped with a third regulating valve, which is used to adjust the opening degree of the return air vent 120.

[0050] In practical applications, the opening degree of the second regulating valve can be used to control the gas flow rate at the exhaust port 130 and the gas flow rate at the return air port 120. For example, when it is necessary to increase the return air volume, the opening degree of the second regulating valve can be decreased, and the opening degree of the third regulating valve can be increased, thereby reducing the amount of gas discharged through the exhaust port 130 and increasing the amount of gas discharged through the return air port 120. When it is necessary to decrease the return air volume, the opening degree of the second regulating valve can be increased, and the opening degree of the third regulating valve can be decreased, thereby increasing the amount of gas discharged through the exhaust port 130 and decreasing the amount of gas discharged through the return air port 120.

[0051] Obviously, those skilled in the art can make various modifications and variations to the embodiments of this utility model without departing from the spirit and scope of this utility model. Therefore, if these modifications and variations of this utility model fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A drying apparatus, characterized by, Including ovens and fresh air modules; The oven has a drying channel for passing the electrode sheets, and a heating module is provided inside the oven to heat the drying channel so that the temperature in the drying channel reaches a preset temperature value. The fresh air module includes an air inlet duct and a heat exchange device. The heat exchange device is connected to the air inlet duct and is used to exchange heat with the fresh air in the air inlet duct. The oven is provided with an air inlet, a return air inlet and an exhaust air outlet. The air inlet is connected to the heat exchange device, and the return air inlet is connected to the air inlet pipe. Fresh air after heat exchange by the heat exchange device enters the oven through the air inlet. A portion of the gas in the drying channel flows into the air inlet pipe through the return air inlet, and another portion of the gas in the drying channel is discharged from the oven through the exhaust air outlet. Wherein, the heating power P of the heating module and the air inlet volume V of the air inlet satisfy: 8kw*m 3 / h≤P*V*10 -5 ≤68kw*m 3 / h.

2. The drying apparatus according to claim 1, characterized by The heating module includes a first heating component and a second heating component. The first heating component is disposed at the top of the oven, and the second heating component is disposed at the bottom of the oven. The drying channel is located between the first heating component and the second heating component.

3. The drying apparatus according to claim 2, characterized in that, The first heating assembly includes a plurality of first heating modules, which are arranged at intervals along the extension direction of the drying channel; The second heating assembly includes a plurality of second heating modules, which are arranged at intervals along the extension direction of the drying channel.

4. The drying apparatus according to claim 3, characterized in that, The top of the oven is provided with multiple air inlets, which are arranged at intervals along the extension direction of the drying channel and are distributed intersectingly with the first heating module.

5. The drying apparatus according to claim 4, characterized in that, In the adjacent arrangement of the air inlet and the first heating module, the distance between the air inlet and the first heating module is 15mm to 60mm.

6. The drying apparatus according to claim 4, wherein The air inlet is equipped with a first regulating valve, which is used to adjust the opening degree of the air inlet.

7. The drying apparatus according to claim 2, wherein Let the projection plane be a plane perpendicular to the arrangement direction of the first heating component and the second heating component. Along the extension direction of the drying channel, the orthographic projection of the first heating component on the projection plane and the orthographic projection of the second heating component on the projection plane partially coincide.

8. The drying apparatus according to claim 1, wherein The heating power P of the heating module satisfies: 200kw≤P≤700kw.

9. The drying apparatus according to claim 8, characterized in that, The air intake volume V of the air intake satisfies: 4000m 3 / h≤V≤10000m 3 / h.

10. The drying apparatus according to claim 1, wherein The oven is also equipped with a temperature sensor, which is used to detect the temperature of the drying channel.

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