Patent ID: 7554300
Filing Date: 2009-06-30
Classification: B60L,H01M,Y02E,Y02T

Abstract:
1. A car power source apparatus comprising: a plurality of batteries to power an electric motor, at least one temperature detection circuit to detect the temperature of the plurality of batteries, an abnormal temperature rise prevention circuit to prevent battery temperature from rising abnormally, wherein said at least one temperature detection circuit is provided with a plurality of temperature sensors disposed in thermal contact with the plurality of batteries to produce a change in electrical resistance with battery temperature, a voltage conversion circuit to convert the electrical resistance change of each temperature sensor into a voltage change, an analog-to-digital (A/D) converter to convert output voltage from the voltage conversion circuit into a digital signal, and a control circuit that inputs the temperature signal output from the A/D converter; said abnormal temperature rise prevention circuit is provided with comparators to compare output voltage from the voltage conversion circuit of said at least one temperature detection circuit with a reference voltage and output an abnormal temperature signal when battery temperature rises above a specified temperature, and a forced current cut-off circuit connected to the comparators to detect a comparator abnormal temperature signal and cut-off battery current; and the control circuit and said abnormal temperature rise prevention circuit monitor battery temperature, and control battery current, and the control circuit constrains battery current when battery temperature rises to the specified temperature set by the control circuit, and said abnormal temperature rise prevention circuit controls to cut-off battery current when battery temperature rises to the specified temperature set by said abnormal temperature rise prevention circuit, the specified temperature for battery current cut-off set by said abnormal temperature rise prevention circuit being higher than the specified temperature for battery current cut-off set by the control circuit.