Design of a Train Storage Battery Balancing Equipment

Targeting the issue that the battery pack life is shortened due to the inconsistent capacity and voltage between single cells in the train battery pack, which may even directly affect the normal use of the electronic equipment inside the train or lead to difficulty in starting some fuel trains, an offline battery pack balancing maintenance equipment method based on the isolated DC-DC converter is designed. In this device, the open circuit voltage (OCV) of the single cell in the battery pack is adopted as the input variable of the balancing control, and the balancing takes the constant voltage current limiting mode. The current is automatically adjusted in real time according to the set voltage and the actual dropout voltage of the battery. The method of combining the DC-DC converter with the electronic switch array is used to realize the energy transfer between single cells. The balancing test data indicates that the device can control the balancing dropout voltage within 10 mV, and the balancing current can be as high as 10 A, which improves the balancing efficiency and effectively reduces the inconsistency between single cells.