Charge-discharge control circuit, method, device and storage medium

A charge-discharge control method performed by a charge-discharge control system applied to a vehicle, wherein the charge-discharge control system comprises:

• a starting power supply;
• a main positive switch unit, wherein,
• a first terminal of the main positive switch unit is connected to the starting power supply, a second terminal of the main positive switch unit is connected to a generator of the vehicle, and the second terminal of the main positive switch unit is connected to a load of the vehicle, and wherein,
• the main positive switch unit is configured to interrupt a current in a first current direction, the first current direction being a current direction of a charging loop under a condition that the generator charges the starting power supply;
• a battery management module, wherein the battery management module is connected to a control terminal of the main positive switch unit, and the battery management module is connected to the starting power supply;
• a main negative switch unit, wherein a first terminal of the main negative switch unit is connected to a negative electrode of the starting power supply, and a second terminal of the main negative switch unit is connected to a second terminal of the generator and a second terminal of the load;
• a heating module, wherein a first terminal of the heating module is connected to the second terminal of the main positive switch unit, a second terminal of the heating module is connected to the first terminal of the main negative switch unit, and a control terminal of the heating module is connected to the battery management module;
• and
• a temperature sensing unit, wherein the temperature sensing unit is disposed inside the starting power supply, the temperature sensing unit is electrically connected to the battery management module,
• wherein the charge-discharge control method comprises:
• turning on, by the battery management module, the main positive switch unit under a condition that it is detected that the generator of the vehicle is turned on;
• obtaining, by the temperature sensing unit, a temperature of a battery cell of the starting power supply;
• under a condition that the temperature of the battery cell is lower than a first temperature threshold, turning on, by the battery management module, the heating module by the battery management module;
• controlling, by the battery management module, the main positive switch unit to interrupt the current in the first current direction by the battery management module;
• and
• controlling, by the battery management module, the main negative switch unit to turn on to cause the generator, the heating module, and the main negative switch unit to form a current loop and to cause the generator to supply electric power to the heating module;
• controlling, by the battery management module, the main positive switch unit to interrupt the current in the first current direction under a condition that it is detected that a voltage of the starting power supply reaches a preset voltage threshold.