I am trying to calculate the heat generation (during charging) from a li-ion battery and I used Bernardi equation for that. Since dU/dT will be low, I calculated the heat flux as follows;
q = [1/A] * [ I2 * R] (W/m2)
Battery pack configuration: 3P30S
Cell capacity [Ah]: 100
Cell voltage [V] : 3.2
Cell’s bottom area [m2]: 0.00405
Battery’s bottom area [m2]: 0.3645
Internal resistance (at 25degC / 0% SOC): 0.001546 [ohm]
Since the C-rate is 2, I calculated the cell current as 200 [A].
When the values are put in place, the heat flux is 15.270 (kW/m2) for a single cell. I couldn’t understand where and how I made a mistake. Could you give me your opinions about it?