Numerical Simulation And Analysis Of Fluid-solid Coupling Heat Transfer Of Lithium Batteries Pole Rolls

Lithium battery pole piece rolls are important equipment for producing lithium battery pole pieces.Common pole piece mill rolls are usually chill rolls.In order to dry the coating on the pole piece,it is usually heated and dried by a set drying oven before rolling.As a result,the production line is long and the work efficiency is low.Hot rolling is to uniformly heat the rolls to a certain temperature,and then directly roll the coated pole pieces without drying through the drying oven.This not only saves equipment costs,but also improves the quality of the lithium battery pole piece by hot rolling,so that the coating can be better combined with the pole piece,and the reliability of the subsequent production of the lithium battery is improved.The more uniform the surface temperature distribution of the rolls,the higher the rolling quality of the pole pieces,so how to make the rolls evenly heated is very important.In this paper,the rolls are heated by introducing a flow path to the rolls to pass hot heat transfer oil.Firstly,using the theory of fluid spiral flow to enhance heat transfer,a new type of roll-rolled hot roll model was designed by designing a spiral groove flow path on the roll core of a lithium battery pole piece roll.The spiral groove flow path increased the heat transfer oil and roll change.The hot area improves the uniformity of the surface temperature of the rolls and the advantages of rapid heating rolls.The transient fluid-solid coupling heat transfer calculation was carried out on the established roll model,and the curve of the surface temperature of the roll with time and the temperature field distribution of the roll surface were obtained.Then,The FLUENT software is used to determine the different inlet flow rates,roll sleeve thickness,cross-sectional shape of the spiral flow path,pitch between the spiral flow paths,radial flow path and end between the roll model and other parameters.The distance between these five important parameters is modeled by fluid-solid coupling heat transfer simulation to study the effect of individual factors on the roll surface temperature field.The orthogonal test method was used to investigate the influence of different inlet flow rate,roll sleeve thickness and pitch on the uniformity of roll surface temperature distribution under different levels of fluid-solid coupling heat transfer.The superior level and superior combination of the test are obtained.Finally,using the ANSYS Workbench platform,the fluid FLUENT analysis module and the Static Structural analysis module are used to analyze the thermo-coupling of the lithium battery pole piece roll,and the roll temperature field obtained by the FLUENT analysis module is loaded as a temperature load to the statics module.The thermal stress field and the deformation of the roll,especially the deformation of the roll surface,have important guiding significance for the actual production of the lithium battery pole piece,thereby improving the production quality of the lithium battery pole piece.