Simulation And Experimental Research On Three-Dimensional Temperature Field Of Infrared Drying Of Lithium Battery Pole Pieces

In recent years,due to the increasingly serious problems of energy crisis and environmental pollution,all countries are actively developing energy-saving and environmentally friendly new energy vehicles.Lithium-ion batteries for vehicles are their core components.At present,there are mainly problems such as poor endurance,short cycle life and unstable performance.Problems seriously hinder the rapid development of the new energy automobile industry.The production level of the battery pole piece determines the safety and performance of the battery.The pole piece drying is a key link in the production process.The drying oven is the main drying equipment.Its structure and internal temperature field have a great influence on the drying quality and drying rate of the pole piece.The main research contents of this paper are as follows:(1)Parameterized modeling of the infrared hot air combined drying oven for lithium battery pole pieces.Based on CFD technology,using the method of numerical simulation,the numerical model of the temperature field of the drying oven is established through the Fluent software and the temperature field is analyzed.(2)The influence of different working condition parameters such as hot air temperature,heat source power and radiation distance on the internal temperature distribution of the drying box is comparatively studied.The temperature change law of the pole piece during the drying process under different working conditions is studied.The results show that the hot air temperature has little effect on the temperature distribution in the box and the drying process of the pole pieces.The drying efficiency will not increase with the increase of the hot air temperature,there is a certain range;The power of the heat source and the radiation distance have a great influence on the distribution and value of the temperature inside the drying box.The greater the power and the smaller the radiation distance,the higher the average temperature in the box,but the worse the uniformity of the temperature distribution.The heat source power should be appropriately increased and the radiation distance should be reduced under the premise of ensuring the drying quality.(3)The symmetry and uniformity are selected as the quantitative indicators to evaluate the uniformity of the temperature field inside the drying oven,and the influence of wind speed,wind temperature,heat source power,radiation distance and other factors on the uniformity of the temperature field is explored.The results show that the symmetry and uniformity of the temperature of the key section decrease with the increase of the wind speed of the air inlet;Within a certain range,as the temperature of the hot air increases,the uniformity of the temperature field in the drying oven decreases.However,the change in symmetry is not obvious,fluctuating around 93% all the time;As the power of the heat source increases,the symmetry and uniformity of the temperature of the critical section will decrease rapidly;The smaller the radiation distance,the lower the symmetry and uniformity of the temperature field in the box.Considering the uniformity of the temperature field and other factors,the optimal working parameters are selected as follows: the air inlet wind speed is0.1 m/s,the hot air temperature is 52°C,the heat source power is 190 W,and the radiation distance is 145 mm.This paper studies the internal temperature field of the infrared hot air combined drying oven,analyzes the influence of different working condition parameters on the uniformity of temperature field,selects the better parameters,and provides a reference for the optimization design of the subsequent lithium battery pole piece drying oven.