Patent ID: 9046586
Filing Date: 2015-06-02
Classification: G01R,H01M,Y02E

Abstract:
1. A secondary battery life diagnosis method, comprising steps of: (a) calculating, by a control circuit, a rate of voltage change dV/dt when a voltage V of a secondary battery reaches a predetermined voltage V (b) calculating, by the control circuit, a rate of change dQ/dt in a quantity of charged electricity Q when the voltage V of the secondary battery reaches the predetermined voltage V (c) calculating, by the control circuit, a ratio X: dQ/dV, of the rate of change dQ/dt in the quantity of charged electricity to the rate of voltage change dV/dt to compare the calculated ratio X with a reference value X (d) determining, by the control circuit, degradation of the secondary battery on the basis of the result of the comparison in step (c).