Power supply system including high-voltage system and low-voltage system and insulation thereof

A power supply system comprising:

• a high-voltage system including a high-voltage battery having a plurality of battery cells;
• a low-voltage system including a main battery, a low-voltage load to which power is supplied from the main battery, and a sub-battery connected to the low-voltage load, the high-voltage system and the low-voltage system are configured such that power is capable of being transmitted and received between the high-voltage system and the low-voltage system via a DCDC converter;
• an insulation transmission part configured to transmit, in an insulated fashion, energy from each of the battery cells to the sub-battery of the low-voltage system individually;
• and
• an equalization and transmission processing part, the equalization and transmission processing part being configured to:
• measure voltage of each of the battery cells;
• set a target battery cell to be processed for equalization;
• and
• control operation of the insulation transmission part, and thereby transmit energy of the target battery cell to the sub-battery of the low-voltage system,
• wherein the sub-battery of the low-voltage system is configured to provide a redundant supply of energy to the low-voltage load at least in response to a determination of a charging of the sub-battery.