Patent ID: 8803479

Claim:
A hybrid battery, comprising: a plurality of rechargeable batteries; a plurality of switching elements for battery selection, each switching element being respectively electrically connected to a high current path of one of the plurality of rechargeable batteries, the number of switching elements corresponding to that of the plurality of rechargeable batteries, each switching element for battery selection being formed of a P-channel field effect transistor; a switching element for charging/discharging including charging switching elements electrically connected to a junction point of all of the high current paths of all of the plurality of rechargeable batteries and discharging switching elements respectively electrically connected to the charging switching elements, each switching element for charging/discharging being formed of an N-channel field effect transistor; and a hybrid battery protection circuit including a plurality of voltage detectors with each voltage detector of the plurality of voltage detectors electrically connected between a switching element of the plurality of switching elements for battery selection and only one of the rechargeable batteries to compare the respective plurality of battery voltages of the plurality of rechargeable batteries with a reference voltage and to output a digital signal corresponding to the voltage value detected by the comparison; and a controller to receive a digital signal output from the plurality of voltage detectors, to select one of the plurality of batteries by outputting an on/off signal to one of the switching elements for battery selection, and to output an on/off signal to the charging/discharging switching element electrically connected to the high current path of the selected battery, the controller being electrically connected to the switching elements of the charging/discharging switching element.