Battery self-heating control system and control method, and electric transportation means

A battery self-heating control system, the control system comprising:

• a battery pack, a winding, a first switch assembly, a second switch assembly, a capacitor, and a controller;
• the battery pack comprising a first battery group and a second battery group that are connected in series, a connection line being led out between the first battery group and the second battery group, and the connection line being connected to one end of the winding;
• the first switch assembly and the second switch assembly being connected in series, the first switch assembly being electrically connected to a positive electrode of the first battery group and a first end of the capacitor, the second switch assembly being electrically connected to a negative electrode of the second battery group and a second end of the capacitor, the first end and the second end of the capacitor being used for connecting to a load, and the other end of the winding being connected between the first switch assembly and the second switch assembly;
• and
• the controller being electrically connected to the first switch assembly and the second switch assembly, the controller being configured to control the first switch assembly and the second switch assembly to switch between an on state and an open state, and make the first battery group and the second battery group perform alternate charging and discharging through the winding, to heat the battery pack, and at least one of the first battery group, the second battery group, and the capacitor being configured to supply power to the load,
• wherein in a case that the control system is in a second state, a battery level of the first battery group is greater than a battery level of the second battery group, and within a first time period of each control cycle, the controller controls the first switch assembly and the second switch assembly to switch between the on state and the open state, and controls the first switch assembly to be in the closed state and the second switch assembly to be in the open state, the first battery group to charge the winding, and the first battery group, the second battery group, and the capacitor to supply power to the load;
• and
• within a second time period of each control cycle, the controller controls the first switch assembly to be in the open state and the second switch assembly to be in the closed state, the winding to charge the second battery group, and the first battery group and the second battery group to supply power to the capacitor and the load.

A control method for a battery self-heating control system, the control system comprising:

• a battery pack, a winding, a first switch assembly, a second switch assembly, a capacitor, and a controller;
• the battery pack comprising a first battery group and a second battery group that are connected in series, a connection line being led out between the first battery group and the second battery group, and the connection line being connected to one end of the winding;
• the first switch assembly and the second switch assembly being connected in series, the first switch assembly being electrically connected to a positive electrode of the first battery group and a first end of the capacitor, the second switch assembly being electrically connected to a negative electrode of the second battery group and a second end of the capacitor, the first end and the second end of the capacitor being used for connecting to a load, and the other end of the winding being connected between the first switch assembly and the second switch assembly;
• and the controller being electrically connected to the first switch assembly and the second switch assembly, the controller being configured to control the first switch assembly and the second switch assembly to switch between an on state and an open state, and make the first battery group and the second battery group perform alternate charging and discharging through the winding, to heat the battery pack, and at least one of the first battery group, the second battery group, and the capacitor being configured to supply power to the load, wherein in a case that the control system is in a first state, within a first half cycle of each control cycle of the controller, the controller is configured to control the first switch assembly and the second switch assembly to switch between the on state and the open state, and the first battery group to charge the winding and charge the second battery group through the winding, and the capacitor and/or the first battery group are/is configured to supply power to the load;
• and within a second half cycle of each control cycle of the controller, the controller is configured to control the first switch assembly and the second switch assembly to switch between the on state and the open state, and the second battery group to charge the winding and charge the first battery group through the winding, and the capacitor and/or the second battery group are/is configured to supply power to the load, the method comprising:
• controlling the first switch assembly and the second switch assembly to switch between the on state and the open state;
• and
• making the first battery group and the second battery group perform alternate charging and discharging through the winding, to heat the battery pack.