Patent ID: 8682517
Filing Date: 2014-03-25
Classification: B60L,G01R,H01M,H02J,Y02E,Y02T

Abstract:
1. A power supply system comprising: a plurality of power storage units; a plurality of voltage converting units corresponding to said plurality of power storage units, respectively; a power line pair connected to said plurality of voltage converting units in parallel; a charging unit for charging said plurality of power storage units by receiving an electric power from an external power supply; a state estimating unit for estimating a charge state value of each of said plurality of power storage units, said state estimating unit successively calculating the charge state value of each of said plurality of power storage units based on an integrated value of a charge/discharge quantity of each of the power storage units; and a control unit for controlling a voltage converting operation in said plurality of voltage converting units, wherein when said plurality of power storage units become chargeable by the external power supply, said control unit controls the voltage converting unit corresponding to a first power storage unit, which is any one among said plurality of power storage units, to discharge said first power storage unit, and controls the voltage converting unit(s) corresponding to the remaining power storage unit(s) to charge said remaining power storage unit with at least the discharge current discharged from said first power storage unit, and said state estimating unit resets the charge state value of said first power storage unit to a reference value based on the discharge current of said first power storage unit before said plurality of power storage units is charged by the external power supply.