Patent ID: 8680817

Claim:
A circuit for heating a battery, the circuit comprising: the battery including a first damping component and a first current storage component, the first damping component and the first current storage component being parasitic to the battery; a switch unit; a switching control module coupled to the switch unit; a first charge storage component, the first charge storage component and the first current storage component being at least parts of an energy storage circuit; an energy limiting circuit coupled to the switch unit; and an energy control unit coupled to the first charge storage component; wherein the circuit for heating the battery is configured to heat the battery by at least discharging the battery and charging the battery; wherein: the first damping component, the first current storage component, the switch unit, and the first charge storage component are connected in series; the switching control module is configured to turn on the switch unit and allow a current to flow back-and-forth between the battery and the first charge storage component; the energy limiting circuit is configured to limit the current flowing from the first charge storage component to the battery; and the energy control unit is configured to control energy stored in the first charge storage component after the switch unit is turned on and then turned off.