Battery and power supply integrated device and hybrid vehicle power supply system with same

The invention discloses a battery and power supply integrated device which comprises a power supply converter, a battery control module and a relay, wherein the power supply converter is provided with an input side and an output side, and the input side is connected with a high-voltage direct-current voltage; the battery control module comprises a relay control circuit and a pre-charging control circuit; the relay is connected with the input side of the power supply converter and the battery control module; and the pre-charging control circuit is used for receiving a pre-charging enabling signal which is generated by the power supply converter, so that the input side of the power supply converter is pre-charged. When the relay is connected by means of controlling of the relay control circuit, the power supply converter is used for reducing the voltage to convert the high-voltage direct-current voltage, and the output side of the power supply converter outputs low-voltage direct-current voltage, so that power