Patent ID: 8306771

Claim:
A system for measuring a temperature in at least one energy storage unit, comprising: a temperature sensor thermally coupled to the at least one energy storage unit, wherein the temperature sensor includes a first temperature sensor, a second temperature sensor and a material disposed between the first temperature sensor and the second temperature sensor; a strip connected to the first temperature sensor and disposed proximate the at least one energy storage unit; a battery management controller in communication with the at least one temperature sensor, wherein the battery management controller is configured to process a temperature of the at least one energy storage unit to obtain an internal temperature of the at least one energy storage unit by extrapolating a temperature at a point between two energy storage units from external temperature measurements using the first temperature sensor and the second temperature sensor wherein the extrapolated temperature T ext between the two energy storage units is dependent on an extrapolation ratio, the extrapolation ratio being a = Ra + Rb Rb , where Ra is a thermal impedance of the strip and Rb is a thermal impedance of the material disposed between the first temperature sensor and the second temperature sensor, and a temperature measured by the first temperature sensor and a temperature measured by the second temperature sensor.