Battery open circuit voltage measurement Medium countercurrent pulse

A battery management system for a vehicle includes a controller which is programmed to apply a current pulse to reverse current flow through a battery in order to reduce or eliminate cell polarization. After the current pulse has a no-load voltage is measured as the terminal voltage of the battery. The settling time in which the terminal voltage of the open circuit voltage approaches, shortened after the current pulse. The amount of the current pulse based on a battery state, a battery temperature and an amount of current before the current pulse.