Patent ID: 8367234
Filing Date: 2013-02-05
Classification: H01M,H02J,Y02E

Abstract:
1. A battery pack comprising: a secondary battery; a discharge-control transistor; a charge-control transistor connected in series with the discharge-control transistor between a negative power source terminal of the secondary battery and either a terminal of a load or a negative power source terminal of a charger: and a battery protection semiconductor device for protecting the secondary battery, the battery protection semiconductor device comprising: a detection circuit to detect at least one of an excessively charged state, an excessive discharging state, an overcurrent state, a short-circuit state, and an overheating state of the secondary battery; a control circuit to turn on and off the discharge-control transistor and the charge-control transistor; and a charge prevention circuit to prevent the secondary battery from being charged by turning off the charge-control transistor when a voltage of the secondary battery is not greater than a predetermined low-voltage criterial voltage that is variable by trimming a portion of the charge prevention circuit, wherein the charge prevention circuit includes a trimming fuse, and in a case that the trimming fuse is intact and not trimmed, the low-voltage criterial voltage is a first threshold value, and when the trimming fuse is trimmed, the low-voltage criterial voltage changes from the first threshold value to a second threshold value that is different from the first threshold value.