Low-voltage power supply control system and method for vehicle

The embodiment of the invention discloses a low-voltage power supply control system and method for a vehicle. The system comprises a first power supply network, a second power supply network, a voltage converter and a gateway; the voltage converter is electrically connected with the high-voltage power supply network; the first power supply network comprises a first switch, a storage battery and a storage battery sensor; the storage battery is electrically connected with the voltage converter through the first switch, and the storage battery is also electrically connected with each low-voltage electricity load and the partial redundant backup load; the storage battery sensor is in communication connection with the gateway; the second power supply network comprises a second switch, a super capacitor and an integrated controller; the super capacitor is electrically connected with the voltage converter, a part of low-voltage electricity load and a part of redundant backup load through a second switch; and the int