Lithium battery coating and drying equipment

Abstract

The utility model discloses lithium battery coating and drying equipment which comprises an air inlet assembly, an air outlet assembly and an infrared heating device, a pole piece is dried through infrared rays generated by the infrared heating device, electric energy is directly converted into high-temperature radiant heat energy of the infrared heating device, and heat energy does not need to be converted through an intermediate medium. The slurry on the pole piece can be directly dried, waste of energy in the intermediate conversion process is avoided, the infrared heating device is cooled in cooperation with the air inlet assembly and the air outlet assembly, and the slurry is dried by heating gas passing through the infrared heating device, so that the drying quality and the drying efficiency are improved.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery production, and in particular to a lithium battery coating and drying equipment. Background Technology

[0002] Currently, drying the electrode sheets is one of the key processes in lithium battery production. Traditional lithium battery coating ovens mainly use electric heating, including various heating elements such as PTC heaters and U-shaped heating tubes. Regardless of the heating method used, the heating process is basically the same: first, electrical energy is converted into the heater's own heat energy; then, the heater heats the air; finally, the heated air (hot air) dries the slurry on the electrode sheets. This drying process involves multiple stages and equipment, and suffers from problems such as low energy conversion efficiency, large heat transfer losses, complex equipment, high maintenance costs, and difficulty in temperature control.

[0003] Therefore, finding a drying technology that can improve heating efficiency, reduce energy loss, simplify equipment structure, and reduce maintenance costs has become an urgent technical problem to be solved in the field of lithium battery manufacturing. Utility Model Content

[0004] In order to overcome the shortcomings of the existing technology, this utility model provides a lithium battery coating and drying equipment with high thermal efficiency, low energy loss, simple equipment structure and low maintenance cost.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A lithium battery coating drying device includes: an air inlet assembly for introducing gas into the oven; an air outlet assembly, the input end of which is connected to the output end of the air inlet assembly for guiding the gas to the area inside the oven that needs to be heated; and an infrared heating device disposed near the air outlet of the air outlet assembly, wherein the infrared heating device dries the slurry by releasing high-temperature infrared rays and heating the gas passing nearby.

[0007] Furthermore, the air outlet assembly includes: an input end and at least one air nozzle including the air outlet connected to the input end, and the infrared heating device is disposed inside the air outlet.

[0008] Furthermore, the input end includes a connecting pipe for air intake, the connecting pipe being made of a flexible material; the connecting pipe is connected to the output end, and through the connecting pipe, the gas introduced by the air intake assembly is transported to the air outlet of the nozzle.

[0009] Furthermore, the nozzle is provided with an input end at each end, and an air outlet cavity communicating with the two input ends. The height of the air outlet cavity gradually increases from the middle towards the two input ends.

[0010] Furthermore, the air outlet cavity is provided with an air filter plate and a heating cavity. The heating cavity is arranged along the length direction of the air outlet, and the heating cavity forms an air outlet gap with the two sides of the air outlet. The infrared heating device is arranged in the heating cavity. The top of the heating cavity is provided with an air inlet hole, and the heating cavity is provided with an opening corresponding to the position of the air inlet hole. The opening is located in the air outlet. After the gas enters the nozzle, it is filtered and pressure equalized by the air filter plate, and is discharged from the air outlet through the air outlet gaps on both sides of the heating cavity and the opening of the heating cavity.

[0011] Furthermore, the air filter plate includes multiple perforated plates spaced apart, and each perforated plate is provided with a plurality of filter holes.

[0012] Furthermore, a protective part for protecting the infrared heating device is provided on the outside of the air nozzle; the protective part is a protective cover provided along the outside of the air outlet, the protective cover includes a plurality of spaced protective components, the plurality of protective components are connected to both sides of the air outlet, and together form a protective net structure.

[0013] Furthermore, the air intake assembly includes: a fan, an air inlet, an air inlet pipe, and multiple output terminals; wherein, the air inlet provides air to the fan, the air inlet pipe is connected to the fan and connected to the air outlet assembly through the multiple output terminals; the air inlet is located at the top of the oven and is connected to the interior of the oven.

[0014] Furthermore, the infrared heating device is an infrared lamp tube.

[0015] Furthermore, a conveying assembly is provided inside the oven, below the air outlet assembly, and the conveying assembly includes multiple drive rollers and a motor that is connected to the drive rollers for transmission.

[0016] The beneficial effects of this utility model are:

[0017] This utility model discloses a lithium battery coating drying device, including an air inlet assembly, an air outlet assembly, and an infrared heating device. The infrared radiation generated by the infrared heating device dries the electrode sheet. The high-temperature radiant heat energy of the infrared heating device is directly converted from electrical energy, eliminating the need for an intermediate medium to convert the heat energy. This allows for direct drying of the slurry on the electrode sheet, avoiding energy waste during intermediate conversion. Furthermore, the air inlet and air outlet assemblies cool the infrared heating device and heat the gas passing near it to dry the slurry, thereby improving the drying quality and efficiency. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0020] Figure 2 This is a schematic cross-sectional view of the present invention;

[0021] Figure 3 This is a three-dimensional structural diagram of the air outlet component of this utility model;

[0022] Figure 4 This is a cross-sectional structural schematic diagram of the air outlet component of this utility model - 1;

[0023] Figure 5 This is a cross-sectional structural schematic diagram of the air outlet component of this utility model - 2.

[0024] in,

[0025] 10. Drying oven;

[0026] 100. Air intake assembly; 110. Fan; 120. Air inlet; 130. Air inlet duct; 140. Output end;

[0027] 200. Air outlet assembly; 210. Input end; 211. Connecting pipe; 220. Air nozzle; 221. Air outlet cavity; 222. Air outlet; 223. Protective part; 224. Air filter plate; 225. Heating cavity;

[0028] 300. Infrared heating device;

[0029] 400. Conveying assembly; 410. Drive roller; 420. Motor. Detailed Implementation

[0030] The following will clearly and completely describe the concept, specific structure, and technical effects of this utility model in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are all within the scope of protection of this utility model. Furthermore, all connections / linkages involved in the patent do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. The various technical features in this utility model can be combined interactively without contradicting each other.

[0031] The working principle of infrared lamps is based on the thermal effect of electric current. When an electric current passes through a tungsten filament, the filament heats up and heats the gas inside the quartz tube, causing the gas molecules to vibrate and release infrared radiation. This infrared radiation has a thermal effect, which can directly heat and dry the surface of an object, achieving a highly efficient heating, drying, and curing process. Since there is currently no fully-infrared heating device for lithium battery coating ovens, this invention designs a lithium battery coating drying device that primarily uses full infrared heating, aiming to replace traditional electric, steam, or oil-heated ovens. This lithium battery coating drying device reduces production costs while significantly improving production efficiency, providing a more uniform heating effect and a faster drying process.

[0032] A lithium battery coating and drying device, as described in the following example. Figure 1-4 The system includes an oven 10, an air inlet assembly 100, an air outlet assembly 200, and an infrared heating device 300, all disposed within the oven 10. The air inlet assembly 100 introduces gas into the oven 10. The input end 210 of the air outlet assembly 200 is connected to the output end 140 of the air inlet assembly 100, guiding the gas to the area within the oven 10 that needs heating. The infrared heating device 300 is located near the air outlet 222 of the air outlet assembly 200. The infrared heating device 300 dries the slurry by releasing high-temperature infrared rays and heating the gas passing nearby. It is understood that the infrared heating device 300 directly heats the slurry by releasing high-temperature infrared rays, while simultaneously heating the gas passing nearby, thus achieving a dual heating effect. Direct infrared heating ensures rapid heating and drying of the slurry surface. Infrared radiation provides uniform heat distribution, avoiding the uneven temperature problems that may be caused by traditional hot air convection heating, ensuring the uniformity of slurry drying and improving product quality. The heating gas provides an auxiliary heat source for the oven 10, further accelerating the drying process. This improves drying efficiency and energy saving. In addition, the use of full infrared heating simplifies the structure of the oven 10, reduces the need for sensor installation, and saves costs.

[0033] In some embodiments, the infrared heating device 300 is an infrared lamp. Alternatively, the infrared heating device 300 can also be an infrared ceramic heater, an infrared quartz heater, a metal wire infrared heater, etc. When the infrared heating device 300 is an infrared lamp, to meet different drying needs, the size, power, wavelength (short wave, medium wave, carbon medium wave), and lamp material of the infrared lamp can be changed. For example, the length and diameter of the infrared lamp can be changed to adapt to ovens 10 or drying areas of different sizes. Selecting infrared heating devices 300 with different powers allows control of heating speed and temperature, suitable for drying different materials. Choosing a suitable infrared wavelength based on the characteristics of the material being dried: short wave infrared is suitable for rapid surface heating, medium wave infrared is suitable for penetrating heating, while carbon medium wave provides a balanced heating effect. Different lamp materials, such as quartz and ceramic, can be selected to adapt to different working environments and temperature requirements.

[0034] In some embodiments, refer to Figure 1 , 2 Inside the drying oven 10, below the air outlet assembly 200, a conveying assembly 400 is provided. The conveying assembly 400 includes multiple drive rollers 410 and a motor 420 connected to the drive rollers 410. It is understood that through the conveying assembly 400, the electrode sheet with slurry can be uniformly heated by infrared rays along its movement path within the drying oven 10, avoiding problems such as localized overheating or uneven drying. Furthermore, by adjusting the number of drive rollers 410 and the power of the motor 420, the conveying assembly 400 can adapt to materials or slurries of different sizes and thicknesses, increasing the adaptability of the equipment. Additionally, the automatic control of the motor 420 by the system enables automated operation, reducing labor costs and human error. The motor 420 is preferably a variable frequency motor 420, which then drives the drive rollers 410 to rotate via a magnetic wheel assembly.

[0035] In some embodiments, refer to Figure 3 The air outlet assembly 200 includes an input terminal 210 and at least one nozzle 220 connected to the input terminal 210, which includes the air outlet 222. The infrared heating device 300 is disposed within the air outlet 222. It is understood that the input terminal 210 can connect to multiple nozzles 220; in this specific embodiment, one input terminal 210 is connected to three nozzles 220. Furthermore, the infrared heating device 300 is directly located within the air outlet 222, allowing the gas to be directly heated by infrared rays as it passes through the air outlet 222, thereby improving heating efficiency and drying effect.

[0036] Furthermore, refer to Figure 5The air outlet cavity 221 is provided with an air filter plate 224 and a heating cavity 225. The heating cavity 225 is arranged along the length direction of the air outlet 222, and the heating cavity 225 and the two sides of the air outlet 222 form an air outlet gap. The infrared heating device 300 is disposed in the heating cavity 225. The top of the heating cavity 225 is provided with an air inlet hole, and the heating cavity 225 is provided with an opening corresponding to the position of the air inlet hole. The opening is located in the air outlet 222. After the gas enters the nozzle 220, it is filtered and pressure equalized by the air filter plate 224, and is discharged from the air outlet 222 through the air outlet gaps on both sides of the heating cavity 225 and the opening of the heating cavity 225. Understandably, the gas first enters the nozzle 220, then encounters the filter plate 224, which consists of multiple spaced perforated plates. The gas is filtered through several filter holes on each perforated plate to achieve pressure equalization. Afterward, the gas flows in two directions: one part flows out through the air outlet gap formed between the heating chamber 225 and the air outlet 222, while the other part enters the heating chamber 225 through the air inlet at the top and exits through the opening on the heating chamber 225 corresponding to the air inlet, which is located inside the air outlet 222. The heating chamber 225 is arranged along the length of the air outlet 222, and the infrared heating device 300 is located inside the heating chamber 225. This allows the airflow to carry the heat generated by the infrared heating device 300 as it flows around the heating chamber 225.

[0037] Furthermore, the gas output from the air outlet 222 includes airflow obliquely ejected from the gaps on both sides of the heating chamber 225 and airflow ejected downward from the opening of the heating chamber 225, forming a multi-directional airflow combination. This multi-directional airflow combination can create a vortex effect on the slurry surface, which can effectively disperse the moisture on the slurry surface and promote gas circulation. When the slurry contains NMP, the oblique airflow on both sides can promptly blow away the dried NMP gas, preventing NMP gas from accumulating around the infrared lamp tube, while the downward airflow in the middle can enhance the drying effect, thereby improving drying efficiency and system safety.

[0038] It should be noted that NMP refers to N-Methyl-2-pyrrolidone. NMP is an organic solvent commonly used in industrial applications such as coatings, cleaning agents, and inks. In the manufacturing process of lithium batteries, NMP is typically used as a solvent in electrode slurries. Considering the volatility and certain toxicity of NMP, direct contact between its fumes and heating equipment (such as infrared lamps) must be avoided during production to ensure safe operation and extend the lifespan of the equipment.

[0039] In some embodiments, refer to Figure 3 , 4The input end 210 includes a connecting pipe 211 for air intake, which is made of a flexible material. The flexibility of the connecting pipe 211 allows it to adapt to changes in the position of the nozzle during lifting and lowering, ensuring a stable and reliable connection between the input end 210 and the external air source. Specifically, when the nozzle 220 is adjusted in height relative to the base, the flexible connecting pipe 211 can bend or extend accordingly, ensuring the continuity of the gas delivery channel and preventing interruption of the air path or loosening of the connection due to changes in the nozzle position.

[0040] In some embodiments, the nozzle 220 is provided with input ends 210 at both ends and air outlet chambers 221 communicating with the two input ends 210. The height of the air outlet chambers 221 gradually increases from the middle towards the two input ends 210. It is understood that since the air pressure is high at the two ends (where air is inlet), the air pressure decreases when the high pressure flows towards the middle of the air outlet chamber 221. However, because the middle of the air outlet chamber 221 is lower, according to Bernoulli's principle, the gas velocity increases while the air pressure remains relatively stable. This prevents the air pressure in the middle of the air outlet chamber 221 from significantly decreasing compared to the two ends. This helps maintain the air pressure balance within the air outlet chamber 221, ensuring the stability and uniformity of gas flow, thereby improving the drying effect and efficiency of the oven 10.

[0041] In some embodiments, refer to Figure 3 The outer side of the air nozzle 220 is provided with a protective part 223 for protecting the infrared heating device 300. The protective part 223 is a protective cover provided along the outside of the air outlet 222. The protective cover includes multiple spaced protective components, which are connected to both sides of the air outlet 222 to form a protective mesh structure. This prevents the infrared heating device 300 from being directly exposed to the external environment, reducing the impact of external factors such as dust, moisture, and mechanical damage on the infrared lamps. This extends the service life of the infrared heating device 300, improves the reliability and safety of the equipment, and also reduces maintenance costs and frequency. Furthermore, the protective part 223 can prevent potential injury to operators during high-temperature operation, ensuring the safety of the operation process. Specifically, the protective part 223 can be selected according to needs. It can be replaced with other mesh structures, such as metal mesh, plastic mesh, or fiber mesh, to provide better ventilation and protection; or it can be replaced with a glass cover, which not only effectively protects the infrared heating device 300 but also allows the status of the infrared lamps to be seen through the glass, facilitating monitoring and maintenance. The glass cover can be transparent or semi-transparent, with different light transmittances selected as needed to ensure effective transmission of infrared rays while providing a certain degree of protection and isolation.

[0042] In some embodiments, refer to Figure 1 , 2 The air intake assembly 100 includes a fan 110, an air inlet 120, an air inlet duct 130, and multiple output terminals 140. The air inlet 120 supplies air to the fan 110, and the air inlet duct 130 is connected to the fan 110 and, through the multiple output terminals 140, is connected to multiple air outlet assemblies 200. It is understood that the fan 110 draws air in through the air inlet 120 and then delivers the air to the multiple output terminals 140 through the air inlet duct 130. These output terminals 140 are connected to the air outlet assemblies 200, ensuring that the air is evenly distributed to all areas requiring heating within the oven 10, thereby improving heating and drying efficiency. Any output terminal 140 can be connected to the air outlet assembly 200 through an input terminal 210, and multiple air nozzles 220 are used to dry the slurry within the oven 10.

[0043] Further, continue to refer to Figure 1 , 2 The air inlet 120 is located at the top of the oven 10 and communicates with the interior of the oven 10. The fan 110 draws circulating air from the top of the oven 10 through the air inlet 120 and supplies air to multiple output terminals 140 via the air inlet duct 130. The low-temperature hot air inside the oven 10 circulates and is blown out through the nozzle 220 to cool the surface of the lamp tubes, resulting in high-temperature air that further dries the slurry. This allows for the recycling of heat energy within the oven 10, further improving efficiency. Simultaneously, the fan 110 can be installed on the side of the oven 10, or the number of fans 110 can be increased to optimize the air duct design and control the airflow speed of the air inlet duct, ensuring uniform air distribution and efficient circulation within the oven 10. It is understood that when an increase in airflow is required, this can be achieved by increasing the power of the fan 110 or increasing the number of fans 110. Meanwhile, the fan 110 can be installed on the top of the oven 10 or on the periphery of the oven 10, so that the installation position of the fan 110 can be flexibly adjusted according to actual needs, thereby optimizing airflow and improving the drying efficiency of the oven 10.

[0044] The above is a detailed description of the preferred embodiments of the present utility model. However, the present utility model is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A lithium battery coating and drying device, characterized in that, include: Air intake assembly, used to introduce gas into the oven; An air outlet assembly, the input end of which is connected to the output end of the air inlet assembly, is used to guide gas to the area inside the oven that needs to be heated; An infrared heating device is located near the air outlet of the air outlet assembly. The infrared heating device dries the slurry by releasing high-temperature infrared rays and heating the gas passing through it.

2. The lithium battery coating and drying equipment according to claim 1, characterized in that, The air outlet assembly includes: an input end and at least one air nozzle connected to the input end, which includes the air outlet, and the infrared heating device is disposed inside the air outlet.

3. The lithium battery coating and drying equipment according to claim 2, characterized in that, The input end includes a connecting pipe for air intake, and the connecting pipe is made of a flexible material; The connecting pipe is connected to the output end, and the gas introduced by the air inlet assembly is transported to the air outlet of the air nozzle through the connecting pipe.

4. The lithium battery coating and drying equipment according to claim 2, characterized in that, The nozzle is provided with an input end at each end, and an air outlet cavity communicating with the two input ends. The height of the air outlet cavity gradually increases from the middle towards the two input ends.

5. The lithium battery coating and drying equipment according to claim 4, characterized in that, The air outlet cavity is provided with an air filter plate and a heating cavity. The heating cavity is arranged along the length direction of the air outlet, and the heating cavity forms an air outlet gap with the two sides of the air outlet. The infrared heating device is disposed inside the heating cavity; The top of the heating chamber is provided with an air inlet, and the heating chamber is provided with an opening corresponding to the position of the air inlet, the opening being located inside the air outlet; After the gas enters the nozzle, it is filtered and pressure equalized by the filter plate, and then discharged from the outlet through the air outlet gaps on both sides of the heating chamber and the opening of the heating chamber.

6. The lithium battery coating and drying equipment according to claim 5, characterized in that, The air filter plate includes multiple perforated plates spaced apart, and each perforated plate has a number of filter holes.

7. The lithium battery coating and drying equipment according to claim 2, characterized in that, The outer side of the air nozzle is provided with a protective part for protecting the infrared heating device; The protective part is a protective cover arranged along the outside of the air outlet. The protective cover includes multiple protective components arranged at intervals. The multiple protective components are connected to both sides of the air outlet to form a protective net structure.

8. The lithium battery coating and drying equipment according to claim 1, characterized in that, The air intake assembly includes: a fan, an air inlet, an air intake duct, and multiple output terminals; The air inlet provides air to the fan, and the air inlet pipe is connected to the fan and connected to the air outlet assembly through multiple output terminals; The air inlet is located at the top of the oven and communicates with the interior of the oven.

9. The lithium battery coating and drying equipment according to any one of claims 1-8, characterized in that, The infrared heating device is an infrared lamp tube.

10. The lithium battery coating and drying equipment according to any one of claims 1-8, characterized in that, Inside the oven, below the air outlet assembly, there is a conveying assembly, which includes multiple drive rollers and a motor that is connected to the drive rollers.

Images