3D FEA Thermal Modeling with Experimentally Measured Temperature Gradient Function from Large Format Ultra-Fast Charging Battery Module used in EVs
2022-01-0843
03/29/2022
- Event
- Content
- In an electric vehicle (EV), due to a number of single cells connected either in series or parallel, generates a large amount of heat because of electrochemical reactions and physical changes, and that would result in the battery degradation (performance and capacity) and thermal runaway issues, and hence demands for an efficient battery thermal management system (BTMS). In this paper, an efficient BTMS is designed and developed for a large format Lithium-ion battery module using a liquid cooling technique. Experiments are conducted on 31Ah NMC/Graphite battery cell which is sandwiched by foams and heat sinks on both sides. A battery module is also developed with three batteries connected in parallel and four cold plates. A total twenty T-type thermocouples are used for this experimental work to measure thermal characteristics including the cell and foam surface temperature, heat flux distribution, and the heat generation from batteries under 2.5C and 3.5C constant power loss tests. Later, a gradient function based on the temperature and heat flux distribution is generated and applied to FEA thermal models. A 3D steady-state and transient FEA model is developed using ANSYS and validated against the experimental data. It is observed that under 3.5C test, the maximum temperature near the battery tabs is 24.1°C and average surface temperature is 23.74°C, measured heat loss is 23.6W, and foam thermal resistance is 0.073W/mK. These sorts of measurements and validation may give understanding into the design and optimization of LIB packs thermal management strategies.
- Citation
- Zhao, Z., Panchal, S., Kollmeyer, P., Emadi, A. et al., "3D FEA Thermal Modeling with Experimentally Measured Temperature Gradient Function from Large Format Ultra-Fast Charging Battery Module used in EVs ," SAE Technical Paper 2022-01-0843, 2022, .