Patent ID: 7619386
Filing Date: 2009-11-17
Classification: H01M,H02J,Y02E

Abstract:
1. A battery pack having a secondary battery and a circuit that controls charging and discharging of the secondary battery, the battery pack comprising: a computer that communicates with another computer disposed in a charging device and authenticates the charging device; and charging control means, controlled by the computer, for supplying a charging current to the secondary battery when the charging device has been successfully authenticated and shutting off the charging current when the charging device has not been successfully authenticated after the charging state has continued for a predetermined time period during which an authentication process is repeated at a plurality of intervals, wherein the computer of the battery pack and the other computer disposed in the charging device mutually authenticate each other according to a challenge and response system, the challenge and response system including wherein the computer of the battery pack and the other computer disposed in the charging device repeatedly authenticate each other at a predetermined cycle, and wherein the shutoff state of the charging current is cancelled when the battery pack is detached from the charging device.