Patent ID: 9263902
Filing Date: 2016-02-16
CPC Classification: H02J,H02P

Claim Text:
1. A battery management system comprising: a charge/discharge circuit electrically connected to a battery and comprising a charging circuit path, a discharging circuit path, and a common circuit path shared by the charging circuit path and the discharging circuit path; an output terminal unit including a positive terminal and a negative terminal in the discharging circuit path, the positive terminal and the negative terminal being electrically connected to each other through an electric motor; a discharge switch unit in the discharging circuit path and configured to control a current flow through the discharging circuit path by open-circuiting or short-circuiting the discharging circuit path; a charge switch unit in the charging circuit path and configured to control a current flow through the charging circuit path by open-circuiting or close-circuiting the charging circuit path; a first resistor in the common circuit path; and a controller configured to detect a voltage across the battery and to detect a current flow through the first resistor during charging and discharging of the battery by controlling the discharge switch unit and the charge switch unit, the controller further configured to control an amount of the current flow through the first resistor in response to a change in the voltage across the battery by controlling a pulse width modulation (PWM) duty ratio of the discharge switch unit to supply a substantially constant amount of power to the electric motor.