Patent ID: 9660299
Date: 2017-05-23
CPC Classifications: G01R,H01M,Y02E

Claim:
1. A method for estimating a capacity degradation of a battery from an initial state to an aged state, said method comprising: applying a strain gauge to said battery; measuring a first strain of said battery (S1), using said strain gauge, at a selected charge capacity of said battery and at said initial state of said battery; measuring a second strain of said battery (S2), using said strain gauge, at said selected charge capacity of said battery and at said aged state of said battery; receiving, by a controller, said measured first strain (S1) and said measured second strain (S2) and estimating said capacity degradation equal to (S2−S1)/S1; determining, by said controller, an absolute charge capacity (Q) for said battery based on said estimated capacity degradation; and performing, by said controller, a subsequent charge-discharge cycle via a charging circuit based at least in part on the determined absolute charge capacity (Q).