Research On The Heat Dissipation Structure Optimization For Vehicle Power Lithium Battery Module Based On CFD

Power battery grouping is one of the key technologies of new energy vehicles.The performance determines safety,driving range and service life.There are problems with battery thermal management system.Suitable temperature is the basic condition of effective performance.Researching on thermal characteristics and optimizing heat dissipation structure are of great significance for improving safety and performance.Most of power battery packs use single cooling method which perform poorly in temperature control.This thesis focuses on heat dissipation structure optimization based on CFD,and explores efficient multi-media coupling heat dissipation structures for battery grouping.This thesis includes the following main aspects:1.Building a three-dimensional unsteady thermal model of battery cell: Analyzing heating mechanism and transfer characteristics of lithium battery.Building a battery thermal effect model and simulating on the cell under different conditions.Designing experiments to evaluate the thermal model.2.Building a three-dimensional unsteady thermal model of battery module: Researching on the thermal modeling method from battery cell to module and simulating the temperature field of the original battery module.3.Developing power battery modules based on multi-media coupling heat dissipation structure: proposing two heat dissipation structure models and simulating the temperature field.This provides a certain design for the heat dissipation structure of the battery module.This thesis proposes new multi-media coupling heat dissipation structures,which can effectively control the temperature of the battery module.It makes great significance in the battery thermal management systems development.