Patent ID: 8574733
Filing Date: 2013-11-05
Classification: H01M,Y02E

Abstract:
1. A protection circuit for a secondary battery, comprising: a resistor having a first end connected to a negative electrode of the secondary battery and an opposite second end connected to an outer negative electrode, wherein the resistor is connected in series between the negative electrode of the secondary battery and the outer negative electrode; a bimetal having a first end and a second end; wherein the first end of the bimetal connects the positive electrode of the secondary battery to the outer positive electrode at room temperature; the second end of the bimetal connects the positive electrode of the secondary battery to the outer negative electrode and the second end of the resistor at a temperature higher than room temperature; and the first end of the bimetal does not connect the positive electrode of the secondary battery and the outer positive electrode at the temperature higher than room temperature.