Ocv estimation of vehicle battery in non-equilibrium state

Abstract

A system and method for battery management of a vehicle is provided. The battery management system may include a battery cell or pack; a contactor and a battery controller. The contactor may be connected to the battery cell or pack. The battery controller may be connected to the battery cell or pack and the contactor. The battery controller may acquire a first measurement of the battery in response to a Keyoff event after disconnection of the contactor. The battery controller may also acquire a second measurement of the battery in response to a Keyon event before connection of the contactor. The battery controller may determine an open circuit voltage (OCV) of the battery cell or pack based on the first and second measurements. For example, the acquired OCV may be used to estimate SOC of the battery and may be used to calibrate the SOC estimation algorithm or other algorithms. The battery controller may also use the acquired measurements to identify the battery model parameters.

Dependencies are inferred from the claim text.