Optimal Design And Performance Study Of Liquid Cooling Heat Dissipation Structure Of Finned Power Battery

As the automotive industry continues to develop,changes in transport have changed the way people travel,As the automotive industry continues to develop,changes in transport have changed the way people travel,but it also brought with it many potential dangers to humanity.The sustained increase in the use of fossil fuels has become a major cause of environmental degradation and human health problems.The search for new forms of energy has become a major issue that needs to be addressed,and the new energy industry of pure electric vehicles has emerged.As a key component of electric vehicles,battery performance is essential to driving the vehicle.Power batteries are extremely demanding in terms of temperature and must be controlled within a certain range in order to work properly,otherwise there will be a constant rise in heat,causing irreversible damage to the battery and even causing thermal runaway.In this paper,a fin-based liquid cooling heat dissipation structure is proposed to view the high temperature of the single cell in the battery module caused by heat generation of the power battery and the temperature difference between the cells.Firstly,the different ways in which heat is generated in the battery and how it gets transferred to the battery,which mainly affects the battery.The heat production of a single cell is also derived from the experiments on the temperature rise of a single cell by previous scholars to provide data support for the numerical simulations below.CFD simulation is applied to optimize the structure of the cold plate,and the cold plate and the battery are combined to form the cooling system of the battery module,and the influence of different factors on the performance of the cooling system is studied.Then,the rhombic fin liquid cooling plate is selected as the experimental object,and the results of the numerical simulation are verified by experiments.The placement of the fin types is also discussed,and the fin form with the best overall performance is finally selected.Then,the effect on the thermal performance of the cold plate is discussed by varying the number of rows and columns.A new fin structure is also designed based on the elliptical finned liquid cooling plate,and the two are compared under each index,this shows the effect of adding a channel inside the ellipse on the average temperature and pressure drop.Based on the previously presented optimal model,multi-objective optimization of the three factors of the cold plate fins was executed.The effects between the opening distance of the fin,the thickness of the outer profile of the fin,the depth of the inner cavity of the fin and the average temperature and pressure drop are fully investigated.The cold plate model after the multi-objective optimization shows a significant improvement in the overall performance relative to the initial cold plate model.Then,based on the optimization model,by changing the shape of the inlet of the model and the misalignment of the fins inside the cold plate,the results show that the shape of the inlet of the model is such that when the flare bifurcation angle α is 45° and the inlet depth is 0 mm,the highest overall performance improvement is achieved.The fins are then modelled to be tapered in size to explore their effect on the various indicators of the cold plate as well as the overall performance.Relative to the initial operating conditions(average temperature of 36.592°C and pressure drop of 4.812 Pa),the average temperature decreases by 0.293°C and the pressure drop decreases by 1.994 Pa.By proposing a liquid-cooled zone partition,the liquid-cooled zone was then divided into 3zones as well as 2 zones,and the total area of the liquid-cooled zone was kept constant to study the effect of the partition on the overall performance of the cold plate.Ultimately,by comparing the different operating conditions,the resulting model improved the overall performance evaluation by 6% compared to the basic operating conditions.The effect of different cooling media on the cold plate was then investigated.The effect of the nanofluid on the liquid cooling system at different Reynolds numbers and at different volume fractions was investigated and compared with water.The Nussle number gradually increases with increasing Reynolds number for the same volume fraction of nanofluid.The larger the volume fraction of the nanofluid,the larger the Nusselt number.Ultimately,the effect of different nanoparticles on the effectiveness of the cold plate was investigated.The nanofluid increases the Nussle number,increases the heat transfer,and thus reduces the average temperature of the cold plate,and brings about the problem of increased pressure drop.Finally,using the obtained optimal liquid cooling plate as a basis and applying it to the designed module,the effect of fluid flow directions,mass flow rates,coolant temperatures,and ambient temperatures on the performance of the battery module is investigated.