Device for use in energy storage system for controlling charging current in lithium-ion-battery, has control unit for controlling switching elements, so that bypass current is guided to battery in one of switching conditions

摘要

The device (22) has two switching elements (36, 38) arranged in series to respective inductive elements (30, 32) i.e. coils. A voltmeter (46) measures a battery voltage (UA) between two ports (24, 26). A control unit (40) controls the switching elements to performs sequence of closing and opening processes, such that a current is partly guided as bypass current (IS) to a battery (12) in a first switching condition and a counter voltage (UG) is produced in a second switching condition, where the counter voltage temporarily lowers the battery voltage. An independent claim is also included for a method for controlling a charging current in a battery.