Patent ID: 9354277
Filing Date: 2016-05-31
CPC Classification: G01R,H02J,Y02T

Claim Text:
1. A method for estimating parameters of a rechargeable energy storage system during a plug-in charge mode, said method comprising: reading a first measured voltage and a measured current from the rechargeable energy storage system while charging the rechargeable energy storage system during a plug-in charge mode; interrupting the charge to stop current flow to the rechargeable energy storage system for a predetermined period of time; reading a second measured voltage during the charge interrupt; calculating a resistance based on the first measured voltage, the second measured voltage and the measured current; calculating an open circuit voltage of the rechargeable energy storage system based on the resistance, the second measured voltage, and the measured current; calculating a residual voltage to compensate for an offset due to a limited period of rest relating to the predetermined period of time; calculating an open circuit voltage of the rechargeable energy storage system based on the resistance, the second measured voltage, the measured current and the residual voltage; and determining the state-of-charge for the rechargeable energy storage system using the open circuit voltage.