Charging system and charging method for electric automobile, and electric automobile

A charging system for an electric automobile, comprising:

• a human-machine interaction module, a power source module and a main control module;
• the human-machine interaction module is connected to the main control module, and configured to receive charging demand information of the electric automobile and send the charging demand information to the main control module;
• the power source module comprises a plurality of power source branches each of which comprises a switch unit and a power source unit, and the switch unit is configured to switch on or switch off the power source branch in which it is located based on a turn-on signal or a turn-off signal of the main control module;
• and
• the main control module is configured to determine, upon receipt of a charging demand of the electric automobile, the power source unit to be turned on or the power source unit to be turned off in the power source module based on the charging demand information, and send the turn-on signal or the turn-off signal to the power source branch in which the power source unit to be turned on or the power source unit to be turned off is located, to control the switch unit to switch on or switch off and the power source unit to be turned on or turned off.