Heating circuits and methods based on battery discharging and charging using resonance components in series and freewheeling circuit components

A battery heating circuit, comprising:

• a switch unit, a switching control module, a damping component, an energy storage circuit, and a freewheeling circuit, wherein:
• the energy storage circuit is connected with the battery, and comprises a current storage component and a charge storage component;
• the damping component, the switch unit, the current storage component, and the charge storage component are connected in series;
• the switching control module is connected with the switch unit, and is configured to control ON/OFF of the switch unit so that the energy can flow back-and-forth between the battery and the energy storage circuit when the switch unit switches on, and amplitude of the current flowing from the energy storage circuit to the battery can be controlled;
• the freewheeling circuit is configured to sustain the current flowing to the battery when there is current flowing from the energy storage circuit to the battery and after the switch unit switches off;
• the switch unit comprises a first one-way branch configured to enable energy flow from the battery to the energy storage circuit and a second one-way branch configured to enable energy flow from the energy storage circuit to the battery;
• the switching control module is connected to the first one-way branch and the second one-way branch respectively, and is configured to control ON/OFF of the connected branches;
• the switch unit comprises a first switch, a second switch, a first one-way semiconductor component, and a second one-way semiconductor component;
• the first switch and the first one-way semiconductor component are connected in series with each other to form the first one-way branch, and the second switch and the second one-way semiconductor component are connected in series with each other to form the second one-way branch;
• and
• the switching control module is connected with the first switch and the second switch to control ON/OFF of the first one-way branch and the second one-way branch by controlling ON/OFF of the first switch and the second switch.