Patent ID: 8864373
Filing Date: 2014-10-21
Classification: G01K,G01R,H01M,Y02E

Abstract:
1. A battery temperature measuring circuit operable with a battery and a temperature sensing device, comprising: the temperature monitoring device connected to the battery and configured to output a measured voltage representative of battery temperature; a first comparator circuit that generates a first output signal, the first comparator circuit comparing the measured voltage to a first reference voltage when the first output signal has a safe logic state, and changing the safe logic state of the first output signal to an unsafe logic state when the measured voltage exceeds the first reference voltage; a second comparator circuit that generates a second output signal, the second comparator circuit comparing the measured voltage to a second reference voltage when the second output signal has a safe logic state, and changing the safe logic state of the second output signal to an unsafe logic state when the measured voltage falls below the second reference voltage; and a current source circuit connected to the temperature sensing device, and the first comparator circuit and the second comparator circuit, the current source circuit sourcing a first constant current to the first comparator circuit when the measured voltage rises above an upper voltage, and a second constant current to the second comparator circuit when the measured voltage falls below a lower voltage, the upper voltage being less than the first reference voltage and greater than the second reference voltage, the lower voltage being less than the upper voltage and greater than the second reference voltage.