Transient Heat Transfer of 42V Ni-MH Batteries for an HEV Application

Spatial-resolution, lumped-capacitance thermal model for cylindrical Li-ion batteries under high Biot number conditions

“…However, a tight temperature requirement presents a big challenge to the Li-ion battery thermal management. For example, the operating temperatures of the Liion battery for EVs and HEVs typically ranges from À40 to 40°C and the cell-to-cell temperature differences are required to be below 5°C [1,3].…”

“…The computational fluid dynamics (CFD) models and finite element models have been widely used for the battery thermal analysis [1,3,6,7]. Multi-dimensional CFD modeling is often a difficult task because of complex modeling steps such as solid modeling, meshing, intense computation and post-processing.…”

“…The traction battery systems often house several hundred to thousands of battery cells such as Li-ion and Ni-MH, which are used under dynamic electrical loading [1][2][3].…”

“…Battery thermal management is critical for operating the battery systems efficiently in all driving and climate conditions without causing thermal damage to the battery cells [1][2][3][4]. The Li-ion battery has recently been a popular choice for the vehicle traction battery due to its high power density and charge/discharge efficiency [5].…”

Evaluating the Potential for Cell Balancing Using a Cascaded Multi-Level Converter Using Convex Optimization

“…To ensure uniform life-time of the cells it is therefore important to utilize each cell so that the State-ofCharge (SoC) and respectively the DoD, remains almost balanced in all cells of the battery pack. Another factor that strongly influences the lifetime is the cell temperature; hotter cells degrade more quickly than colder cells, see Park and Jaura (2003b), Park and Jaura (2003a), Park and Jaura (2002), and Pesaran and Vlahinos (1997). Therefore, even a few overheated cells may result in shortening the lifetime of the whole battery pack.…”