Patent ID: 7898216
Filing Date: 2011-03-01
Classification: H01M,H02H,Y02E

Abstract:
1. A rechargeable battery device comprising a rechargeable battery and a protection circuit for protecting the rechargeable battery from overcharge and overdischarge, wherein the rechargeable battery device has a charging/discharging line, a charging line and a discharging line for the rechargeable battery, which are all arranged independently from each other; the protection circuit includes a nonreturn-type switch that is interposed in the charging line in series and interrupts the charging line by blowout; a semiconductor switch that is interposed in the discharging line in series and electrically continues or interrupts the discharging line; and a switch control circuit that turns off the semiconductor switch element when detecting overdischarge of the rechargeable battery, and blows out the nonreturn-type switch when detecting a malfunction of the rechargeable battery device.