Self-heating control circuit and system

A self-heating control system, comprising:

• two battery packs connected in parallel, the two battery packs comprising a first battery pack and a second battery pack;
• and
• a self-heating control circuit comprising:
• a control module configured to obtain a cell temperature of each of the two battery packs, and send a trigger signal in response to the cell temperature being lower than a threshold;
• a switch module disposed at a charging and discharging circuit of the first battery pack, wherein a control terminal of the switch module is connected to the control module and is configured to cut off the charging and discharging circuit upon reception of the trigger signal;
• an excitation module configured to form a path with the two battery packs upon cut-off of the charging and discharging circuit, and generate an excitation current, so that the excitation current flows back and forth between the two battery packs;
• and
• a housing, the control module, the switch module, and the excitation module being accommodated in the housing;
• wherein:
• the housing is provided with a plurality of interfaces, the plurality of interfaces comprising a first positive interface, a second positive interface, a first negative interface, and a second negative interface arranged in an order on a left side of the housing, and a third positive interface, a fourth positive interface, a third negative interface, and a fourth negative interface arranged in an order on a right side of the housing;
• the first positive interface, the second positive interface, the first negative interface, and the second negative interface are connected to a positive pole of the second battery pack, a positive pole of the first battery pack, a negative pole of the first battery pack, and a negative pole of the second battery pack, respectively;
• inside the housing, the first positive interface is connected to the third positive interface, the second positive interface is connected to the switch module, the first negative interface is connected to the third negative interface, and the second negative interface is connected to the fourth negative interface;
• a terminal of the excitation module is connected to the first negative interface and the third negative interface;
• and
• the third positive interface and the fourth positive interface are connected to each other, and the third negative interface and the fourth negative interface are connected to each other.