Device for determining physical quantity of battery pack

A device for determining a physical quantity of a battery pack as a combined body of a plurality of a single secondary battery cells, comprising:

• a physical quantity detecting part for generating a signal of a level corresponding to a value of physical quantity of the battery pack to be detected;
• an environmental temperature detecting part for generating a signal of a level corresponding to an ambient temperature in the device;
• an A/D converter for converting analog signals from the physical quantity detecting part and the environmental temperature detecting part into digital signals;
• a storage part for storing in advance signal levels that are obtained from the physical quantity detecting part and the environmental temperature detecting part via the A/D converter so as to correspond to a plurality of environmental temperatures in a predetermined temperature range;
• a signal processing part for correcting a signal level obtained from the physical quantity detecting part via the A/D converter, based on the signal levels corresponding to the plurality of environmental temperatures that have been stored in the storage part;
• and
• a voltage regulator for regulating a voltage level of an input power source to supply the environmental temperature detecting part and the A/D converter with reference voltages as a reference voltage for detection and a reference voltage for conversion, respectively, and supply the storage part and the signal processing part with the reference voltage as a supply voltage.