Micro Hybrid Battery Thermal Design: An Investigation of Thermal Design Impacts on Drive Profile Performance and Aging Response in a 48V Battery System

摘要

Automotive thermal system requirements for Lithium-ion batteries aim to extend life and provide full drive profile performance capability under relatively extreme summer and geographic location operating conditions. However, these design requirements may result in cooling systems for Lithium Ion batteries that do not add significant additional value in fuel economy or battery life for a large portion of everyday drivers of vehicles. Cooling systems that satisfy the worst case combination of unusually high operating temperatures and conservative assumptions on lifetime operating conditions would be over-designed for the majority of users. This 48V micro hybrid study investigates multiple cooling and design approaches based on benchmarked data of various cooling strategies, such as actively pumped liquid cooling, and passively convected or conducted benchmark cooling approaches. From this baseline thermal performance data, this study demonstrates a methodology to quantify differences in drive profile and fuel economy performance as well as expected battery life differences of directional thermal design cooling targets of a 48V battery system.