Battery heating circuits and methods with resonance components in series using voltage inversion based on predetermined conditions

A battery heating circuit, comprising a switch unit, a switching control module, a damping component, an energy storage circuit, and an energy superposition unit, wherein:nthe energy storage circuit is configured to connect with the battery to form a loop, 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 switch on the switch unit so as to allow current flow from the battery to the energy storage circuit and from the energy storage circuit to the battery and to switch off the switch unit so as to stop the current flow;the energy superposition unit is connected across the charge storage component, and is configured to superpose the energy in the energy storage circuit with the energy in the battery after the switch unit switches on and then switches off;the switching control module is also configured to control the switch unit to switch off after the first positive half cycle of the current flow through the switch unit after the switch unit switches on, and the voltage applied to the switch unit at the time the switch unit switches off is lower than the voltage rating of the switch unit.

A battery heating circuit, comprising a switch unit, a switching control module, a damping component, an energy storage circuit, and an energy superposition unit, wherein:nthe energy storage circuit is configured to connect with the battery to form a loop, 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 as to control the energy flowing between the battery and the energy storage circuit;the energy superposition unit is connected with the energy storage circuit, and is configured to superpose the energy in the energy storage circuit with the energy in the battery after the switch unit switches on and then switches off;the switching control module is also configured to control the switch unit to switch off after the first positive half cycle of the current flow through the switch unit after the switch unit switches on, and the voltage applied to the switch unit at the time the switch unit switches off is lower than the voltage rating of the switch unit;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 switch unit by controlling ON/OFF of the connected branches; andthe switch unit comprises a first switch, a first one-way semiconductor component, a second switch, and a second one-way semiconductor component;the first switch and the first one-way semiconductor component are connected with each other in series to constitute the first one-way branch;the second switch and the second one-way semiconductor component are connected in series with each other to constitute the second one-way branch;the switching control module is connected with the first switch and the second switch, and is configured 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.