Theoretical And Numerical Validation For Thermal Modeling Of Ev Battery Cell

Battery packs are extensively used in electrical vehicles (EV) to avoid environmental pollution. The safety, aging and life of battery cell are significantly related to its thermal behavior. This work concerns with thermal analysis and measurement of an EV battery cell of 153Ah. The Bernardi's heat generation model is employed and the reversible heat is taken into account. The reversible heat is related to the entropy coefficient and it is tested and presented as a relation to SOC. The specific heat capacity and the relationship between the heat and the temperature rise of battery cells are tested by the EV-ARC. The heat generation model is validated by tests at 0.2 C, 0.67 C and 1.2 C discharging rates. It reveals that the reversible heat is not negligible especially at low rate discharge. Then the heat generation model is applied to a cell model to verify the temperature of the cell. The numerical results from this thermal modeling of the battery cell are in good agreement with the test results.