Battery Device, Internal Combustion Engine System Including Battery Device, and Motor Vehicle Equipped with Internal Combustion Engine System

摘要

In the battery device of the invention, the voltage equalization process activates the voltage equalization circuits (B 1 ) through (B 3 ) to respectively equalize the voltages of the plural cells included in each of the three battery modules (C 1 ) through (C 3 ) in the state of serial connection of the battery modules (C 1 ) through (C 3 ). After completion of the voltage equalization in each of the three battery modules (C 1 ) through (C 3 ), the voltage equalization process connects the three battery modules (C 1 ) through (C 3 ) in parallel and equalizes the voltages of the respective battery modules (C 1 ) through (C 3 ). This arrangement effectively reduces the power loss by the voltage equalization and thus enhances the total energy efficiency of the whole battery device.