Method and system for validating a temperature sensor in a battery cell

A method for validating a temperature sensor integrated into a battery system, comprising:

• determining an internal resistance of at least one battery cell in thermal contact with the temperature sensor;
• determining a state of charge (SOC) of the at least one battery cell;
• determining at least one reference temperature from a memory or a functional relationship connecting the internal resistance, the SOC, and a temperature of a reference battery cell;
• and
• comparing the at least one reference temperature with at least one temperature measurement of the temperature sensor to determine a difference therebetween.

A battery system, comprising:

• at least one battery cell;
• at least one temperature sensor in thermal contact with and configured to sense temperature of the at least one battery cell;
• at least one voltage sensor configured to measure a terminal voltage of the at least one battery cell;
• and
• a controller configured to i) determine an internal resistance of the at least one battery cell, ii) determine a state of charge (SOC) of the at least one battery cell, iii) determine at least one reference temperature from a lookup table (LUT) or a functional relationship connecting the internal resistance, the SOC, and a temperature of a reference battery cell, iv) compare the at least one reference temperature with at least one temperature measurement of the temperature sensor to determine a difference therebetween and v) validate the temperature sensor based on whether the difference exceeds a preconfigured threshold.