Integrated double-sided coating infrared drying heat pump combined system

Abstract

The utility model provides a kind of integrated double-sided coating infrared drying heat pump combined supply system, including the oven system for drying lithium battery pole piece substrate, first air nozzle mechanism and second air nozzle mechanism are equipped in the oven system, infrared heating component for heating treatment to waste gas is equipped in the oven system with the first air nozzle mechanism and second air nozzle mechanism cooperation, for waste gas is discharged by exhaust fan after being treated by heat pump circulation system by air pipe cooling, the utility model has can effectively improve energy utilization, protect lithium battery coating substrate, energy consumption is low and so on Advantage, with great economic value and social value.

Description

Technical Field

[0001] This utility model relates to the field of NMP exhaust gas treatment equipment design technology for lithium battery coating machines, and in particular to an integrated double-sided coating infrared drying heat pump combined supply system. Background Technology

[0002] In battery manufacturing, electrode substrate coating is one of the key processes. After coating, the electrodes need to be heated and dried to evaporate the solvent. In the drying process of lithium-ion batteries, hot air is mainly used as the drying medium for convection drying, causing the wet solvent to evaporate from the coating slurry. The heat source is a critical piece of equipment in the drying system, ensuring uniform and thorough drying inside the oven and minimizing battery damage caused by drying defects, which affects the performance of the finished battery. The drying process is also a major energy-consuming stage. A professor at a US university collected and analyzed energy consumption data from lithium battery production. The main energy consumption in the lithium-ion battery production process includes oven drying, environmental control, and manufacturing equipment (slurry homogenization, coating, rolling, slitting, stacking, electrolyte injection, battery assembly, and formation, etc.). The highest energy consumption is mainly in the electrode drying process and the operating costs of the drying units in the drying room during battery production, accounting for approximately 46% of the total energy consumption in the lithium-ion battery production process. How to reduce the energy consumption of the electrode drying process is a common problem faced by the industry.

[0003] A domestic university conducted a professional analysis of the energy consumption of lithium battery electrode drying systems, establishing an energy balance analysis model based on the first law of thermodynamics. This model describes the calculation methods for energy consumption related to the heating of the electrode substrate and coating, solvent evaporation and phase change, heating of the drying medium, and system ventilation, as well as their balance with the total system energy input. A practical analysis and calculation were performed using a typical drying process for a water-soluble negative electrode coating as an example. The results show that the main energy consumption is for heating the drying medium, accounting for 93.30% of the total system energy consumption. Of the energy in the drying medium, the portion used for heating the substrate and coating is negligible, accounting for 0.14% and 0.21% respectively, while 6.74% is used for solvent consumption. System ventilation energy consumption is mainly used to overcome the resistance of the drying system and transport the drying medium, and its proportion in the total energy consumption is not high, at 6.70%. Traditional hot air drying methods suffer from high heat loss and an energy utilization rate of <10%, necessitating the adoption of new drying technologies to improve energy efficiency and reduce energy consumption. Therefore, further improvements are required. Utility Model Content

[0004] This utility model addresses the shortcomings of the prior art by providing an integrated double-sided coating infrared drying heat pump system that effectively improves energy utilization, protects lithium battery coating substrates, and has low energy consumption.

[0005] The technical solution adopted by this utility model to solve the above problems is as follows:

[0006] This utility model provides an integrated double-sided coated infrared drying heat pump system.

[0007] This includes an oven system for drying lithium battery electrode substrates, the oven system comprising a first air nozzle mechanism and a second air nozzle mechanism.

[0008] The oven system is equipped with an infrared heating component that works in conjunction with the first and second air nozzle mechanisms to heat the exhaust gas.

[0009] The oven system is equipped with an exhaust port. The exhaust gas emitted from the exhaust port is cooled by a heat pump circulation system through a duct before being discharged by an exhaust fan.

[0010] The oven system is also equipped with a circulating air outlet, which is connected to the first air nozzle mechanism and the second air nozzle mechanism through a circulating fan and an air duct. The exhaust gas from the circulating air outlet is heated by the circulating fan through the air duct and then delivered to the first air nozzle mechanism and the second air nozzle mechanism respectively.

[0011] Furthermore, the first air nozzle mechanism and the second air nozzle mechanism are composed of multiple air outlet structures, and the first air nozzle mechanism and the second air nozzle mechanism are respectively located on both sides of the lithium battery electrode substrate.

[0012] Furthermore, the multiple air outlet structures of the first or second air outlet mechanism are connected by air ducts.

[0013] Furthermore, the heat pump cycle system consists of a compressor, a heat exchanger, an expansion valve, and an evaporator. The compressor, heat exchanger, expansion valve, and evaporator are connected by refrigerant pipelines and form a refrigerant circulation loop.

[0014] Furthermore, the evaporator of the heat pump cycle system is used to cool the exhaust gas discharged from the exhaust port.

[0015] The heat exchanger of the heat pump circulation system is used to heat the exhaust gas discharged from the circulation vent.

[0016] Furthermore, the exhaust fan is connected to an NMP condensation and precipitation system via a duct to precipitate NMP waste gas. The NMP condensation and precipitation system is connected to an NMP secondary recovery system via a duct. The NMP waste gas passes through the NMP secondary recovery system and is then discharged to high altitude through the exhaust duct.

[0017] The beneficial effects of this utility model are as follows:

[0018] The integrated double-sided coated infrared drying heat pump system provided by this utility model has the advantages of effectively improving energy utilization, protecting the lithium battery coating substrate, and low energy consumption. The specific advantages of this application are reflected in the following aspects:

[0019] (1) This application utilizes infrared radiation (wavelength 0.75-1000nm), which is part of the electromagnetic spectrum. The working principle of infrared drying technology is mainly based on the thermal effect and molecular resonance of infrared radiation, exhibiting a significant thermal effect. When infrared radiation irradiates the surface of an object, most of the energy is absorbed by the material and converted into internal energy, causing the object's temperature to rise rapidly. This direct energy conversion avoids heat loss in traditional heat conduction methods, improving energy utilization efficiency. Significant energy savings are achieved by increasing energy utilization.

[0020] (2) Heat pump technology is a green and energy-saving technology. The heat pump system uses the work of the compressor to "pump" the heat from the low-temperature heat source (such as air, water, soil or industrial waste heat) to the high-temperature end. Its energy efficiency ratio (COP) can reach 3-5, which is far superior to traditional electric heating equipment. During the hot air drying process of the coating machine electrode, a large amount of waste heat gas of 40-105 degrees needs to be discharged. The heat pump system can be fully utilized to absorb the waste heat and convert it into usable high-temperature hot air for drying the coated wet electrode in the oven. The cold energy generated by the heat pump low-temperature evaporator can be used to condense and recover NMP solvent, which achieves two goals at once and saves more energy.

[0021] (3) By integrating double-sided coating, infrared drying and heat pump cooling and heating technologies, the system has achieved a comprehensive breakthrough in energy efficiency, environmental protection and process adaptability, and has become the core solution for high-end coating equipment in the fields of lithium batteries and flexible electronics.

[0022] In conclusion, this application has significant economic and social value. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the principle structure of Embodiment 1 of the integrated double-sided coated infrared drying heat pump combined supply system of this utility model;

[0024] Figure 2 This is a flowchart of the working process of Embodiment 1 of the integrated double-sided coated infrared drying heat pump combined supply system of this utility model;

[0025] Figure 3 This is a schematic diagram of the principle structure of Embodiment 2 of the integrated double-sided coated infrared drying heat pump system of this utility model. Detailed Implementation

[0026] The embodiments of this utility model are described in detail below with reference to the accompanying drawings. The drawings are for reference and illustration only and do not constitute a limitation on the scope of patent protection of this utility model.

[0027] Example 1

[0028] like Figure 1-2 As shown, this utility model provides an integrated double-sided coated infrared drying heat pump system.

[0029] The system includes an oven system 1 for drying lithium battery electrode substrate 100, wherein the oven system 1 is provided with a first air nozzle mechanism 101 and a second air nozzle mechanism 102.

[0030] The oven system 1 is equipped with an infrared heating component 2 that cooperates with the first air nozzle mechanism 101 and the second air nozzle mechanism 102 to heat the exhaust gas.

[0031] The oven system 1 is equipped with an exhaust port 103. The exhaust gas emitted from the exhaust port 103 is cooled by the heat pump circulation system 4 through the air duct 3 and then discharged by the exhaust fan 5.

[0032] The oven system 1 is also provided with a circulating air outlet 104. The circulating air outlet 104 is connected to the first air nozzle mechanism 101 and the second air nozzle mechanism 102 through the circulating fan 6 and the air duct 3. The exhaust gas from the circulating air outlet 104 is heated by the circulating fan 6 through the air duct 3 and then delivered to the first air nozzle mechanism 101 and the second air nozzle mechanism 102 respectively.

[0033] In this embodiment, the first air nozzle mechanism 101 and the second air nozzle mechanism 102 are composed of multiple air outlet structures 105.

[0034] The first nozzle mechanism 101 and the second nozzle mechanism 102 are respectively disposed on both sides of the lithium battery electrode substrate.

[0035] In this embodiment, multiple air outlet structures 105 of the first air outlet mechanism 101 or the second air outlet mechanism 102 are connected by air duct 3.

[0036] In this embodiment, the heat pump circulation system 4 consists of a compressor 7, a heat exchanger 8, an expansion valve 9, and an evaporator 10. The compressor 7, heat exchanger 8, expansion valve 9, and evaporator 10 are connected by a refrigerant pipeline 11 and form a refrigerant circulation loop.

[0037] In this embodiment, the evaporator 10 of the heat pump cycle system 4 is used to cool the exhaust gas discharged from the exhaust port 103.

[0038] The heat exchanger 8 of the heat pump circulation system 4 is used to heat the exhaust gas discharged from the circulation vent 104.

[0039] In this embodiment, the exhaust fan 5 is connected to an NMP condensation and precipitation system 200 via a duct 3 for precipitating NMP waste gas. The NMP condensation and precipitation system 200 is connected to an NMP secondary recovery system 300 via a duct 3. The NMP waste gas passes through the NMP secondary recovery system 300 and is then discharged to the upper atmosphere via the exhaust duct 400.

[0040] Example 2

[0041] The difference between this embodiment and the previous embodiment is that:

[0042] like Figure 3 As shown, this embodiment can also use a water-soluble agent to replace NMP exhaust gas. With a water-based solvent, water will not pollute the environment, and no exhaust gas treatment device is required. Infrared heating integrated with a heat pump achieves combined heating and drying, greatly reducing the energy consumption of the device.

[0043] The integrated double-sided coated infrared drying heat pump system provided by this utility model has the advantages of effectively improving energy utilization, protecting the lithium battery coating substrate, and low energy consumption. The specific advantages of this application are reflected in the following aspects:

[0044] (1) This application utilizes infrared radiation (wavelength 0.75-1000nm), which is part of the electromagnetic spectrum. The working principle of infrared drying technology is mainly based on the thermal effect and molecular resonance of infrared radiation, exhibiting a significant thermal effect. When infrared radiation irradiates the surface of an object, most of the energy is absorbed by the material and converted into internal energy, causing the object's temperature to rise rapidly. This direct energy conversion avoids heat loss in traditional heat conduction methods, improving energy utilization efficiency. Significant energy savings are achieved by increasing energy utilization.

[0045] (2) Heat pump technology is a green and energy-saving technology. The heat pump system uses the compressor 7 to "pump" heat from a low-temperature heat source (such as air, water, soil or industrial waste heat) to a high-temperature end. Its energy efficiency ratio (COP) can reach 3-5, which is far superior to traditional electric heating equipment. During the hot air drying process of the coating machine electrode, a large amount of waste heat gas at 40-105 degrees Celsius needs to be discharged. The heat pump system can be fully utilized to absorb the waste heat and convert it into usable high-temperature hot air for drying the coated wet electrode in the oven. The cold energy generated by the heat pump low-temperature evaporator 10 can be used to condense and recover NMP solvent, achieving two goals at once and saving energy.

[0046] (3) By integrating double-sided coating, infrared drying and heat pump cooling and heating technologies, the system has achieved a comprehensive breakthrough in energy efficiency, environmental protection and process adaptability, and has become the core solution for high-end coating equipment in the fields of lithium batteries and flexible electronics.

[0047] This application replaces traditional electric heating and chiller units with a heat pump system, reducing overall energy consumption by 0%-70% and improving the energy efficiency of the infrared drying module by 30%. The infrared drying temperature can be controlled between 80-120℃, avoiding high-temperature damage to the flexible substrate. The use of a double-sided coating module, combined with high-precision slot extrusion technology, significantly improves electrode production efficiency. In summary, this application has significant economic and social value.

[0048] The above embodiments are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model shall be considered equivalent substitutions and shall be included within the protection scope of the present utility model.

Claims

1. An integrated double-sided coated infrared drying heat pump system, characterized in that: This includes an oven system for drying lithium battery electrode substrates, the oven system comprising a first air nozzle mechanism and a second air nozzle mechanism. The oven system is equipped with an infrared heating element that works in conjunction with the first and second air nozzle mechanisms to heat the exhaust gas. The oven system is equipped with an exhaust port. The exhaust gas emitted from the exhaust port is cooled by a heat pump circulation system through a duct before being discharged by an exhaust fan. The oven system is also equipped with a circulating air outlet, which is connected to the first air nozzle mechanism and the second air nozzle mechanism through a circulating fan and an air duct. The exhaust gas from the circulating air outlet is heated by the circulating fan through the air duct and then delivered to the first air nozzle mechanism and the second air nozzle mechanism respectively.

2. The integrated double-sided coated infrared drying heat pump system according to claim 1, characterized in that: The first and second air nozzle mechanisms are composed of multiple air outlet structures. The first nozzle mechanism and the second nozzle mechanism are respectively located on both sides of the lithium battery electrode substrate.

3. The integrated double-sided coated infrared drying heat pump system according to claim 1, characterized in that: The multiple air outlet structures of the first or second air outlet mechanism are connected by air ducts.

4. The integrated double-sided coated infrared drying heat pump system according to claim 1, characterized in that: The heat pump cycle system consists of a compressor, a heat exchanger, an expansion valve, and an evaporator. The compressor, heat exchanger, expansion valve, and evaporator are connected by refrigerant pipelines and form a refrigerant circulation loop.

5. The integrated double-sided coated infrared drying heat pump system according to claim 1, characterized in that: The evaporator of the heat pump cycle system is used to cool the exhaust gas discharged from the exhaust port. The heat exchanger of the heat pump circulation system is used to heat the exhaust gas discharged from the circulation vent.

6. The integrated double-sided coated infrared drying heat pump system according to claim 1, characterized in that: The exhaust fan is connected to an NMP condensation and precipitation system via a duct to precipitate NMP waste gas. The NMP condensation and precipitation system is connected to an NMP secondary recovery system via a duct. The NMP waste gas passes through the NMP secondary recovery system and is then discharged into the upper atmosphere via the exhaust duct.

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