Patent ID: 8831904

Claim:
A system for measuring a temperature in at least one energy storage unit, comprising: at least one temperature sensor thermally coupled to the at least one energy storage unit; and 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; wherein the internal temperature T comp in the at least one energy storage unit is calculated using a temperature T means measured by the at least one temperature sensor; and wherein the internal temperature T comp is calculated as follows: T comp =T means +( T lowpass −T lowpass ′)τ/ dt, where T lowpass = T lowpass ⁢ ′ ⁢ ( 1 - β ) + β ⁢ ⁢ T means ⁢ ⁢ with ⁢ ⁢ β = dt · DL τ and dt being the sample time and T lowpass ′ corresponding to a previous sample of T lowpass , τ is a time constant and DL is the derivative lift.