| Lithium battery has become an ideal energy storage element in the 21 st century due to its high efficiency and wide application.The electrode piece is an important part of lithium battery.With the deepening of research on lithium battery,how to reduce the defect of electrode piece drying and improve the production quality of lithium battery has become an urgent problem to be solved.Suspend oven is the core equipment of lithium battery pole piece drying,pole piece drying in the oven uneven,uneven surface and even pole piece tear and other problems are closely related to the rationality of the structure of the oven.Focusing on the structure of lithium battery suspension oven,this paper aims to study the internal flow field of the existing oven by means of numerical simulation.Aiming at the problems of uneven flow field distribution and large air flow resistance,the structure of the air cutter and oven is optimized and improved.The specific work is as follows:Firstly,the overall structure of the suspension oven of lithium battery and the drying principle of the pole sheet are analyzed,and the necessity of numerical simulation of the oven is pointed out.The solid model of the oven was established and the distribution characteristics of wind speed field,temperature field and pressure field were obtained.Taking the non-uniformity coefficient as the quantitative index,the wind speed distribution uniformity along the width and length direction of the pole surface was analyzed,and the resistance of the oven was evaluated by using the total pressure difference parameter.The numerical simulation results show that the flow field distribution of the oven is uneven and accompanied by a large flow resistance.Finally,the accuracy of the distribution of parameters such as wind speed and temperature in the simulation results is verified by experiments.The numerical simulation model of the flow field of the air cutter was established,and the influence of the main structural parameters of the air cutter(opening ratio,slit width and air supply height)on the uniformity of the flow field and the resistance characteristics of the air cutter was analyzed.According to the numerical simulation results,the reasonable selection range of each structural parameter is obtained,and the structural design criterion of the wind blade is put forward.In order to solve the problems of uneven flow field distribution and large resistance in the oven,the structure of the oven was optimized by numerical simulation.The results show that adjusting the position of the inlet to the right side of the oven can effectively improve the uniformity of the wind speed distribution on the surface of the pole plate,and reduce the flow resistance of the air in the oven.The resistance can be further reduced by adding a curving guide plate.Compared with the original oven structure,the overall wind speed distribution uniformity on the surface of the optimized oven pole plate is improved by 32%,and the flow resistance of the air in the oven is reduced by 30%.The research results can provide a theoretical basis for the design and production of air knife and oven equipment,so as to improve the drying quality of electrode pieces,reduce the energy consumption of oven operation,and lay a foundation for the final high-quality production of lithium battery. |
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