System for determining an accurate ohmic resistance value associated with a battery cell

A system for determining an accurate ohmic resistance value associated with a battery cell, comprising:

• a current sensor generating a current signal indicative of an electrical current amplitude of an electrical current flowing through the battery cell;
• a voltage sensor generating a voltage signal indicative of a voltage level of the battery cell;
• a temperature sensor generating a temperature signal indicative of a temperature level of the battery cell;
• a microprocessor determining a first current value based on the current signal, a first voltage value based on the voltage signal, a first temperature value based on the temperature signal, and a first SOC (State-Of-Charge) value based on a battery cell capacity value, the first voltage value and the first temperature value;
• a memory device having a 3-D interpolation table stored therein with at least first, second, third, fourth, fifth, sixth, seventh, and eighth records, and each of the first, second, third, fourth, fifth, sixth, seventh, and eighth records having a respective SOC value, a respective temperature value, a respective current value, and a respective ohmic resistance value;
• and
• the microprocessor performing a 3-D interpolation calculation based on the first SOC value, the first temperature value, the first current value, and each respective SOC value, each respective temperature value, and each respective current value in the first, second, third, fourth, fifth, sixth, seventh, and eighth records in the 3-D interpolation table to determine the accurate ohmic resistance value associated with the battery cell.