Battery heating circuits and methods using resonance components in series and bridge charge storage components
View Patent ↗Under one aspect, a battery heating circuit includes damping and current storage components connected with the battery to form a first part of a first loop. First and second switch units are connected with the first part of the first loop. Third and fourth switch units are connected with the first part of the first loop to form a second loop. A charge storage component is connected across the first and second loops. The first and third switch units and charge storage component form branches transferring energy between the battery and charge storage component, and the fourth and second switch units and charge storage component form branches transferring energy between the battery and charge storage component. The switching control module switches on and off the first through fourth switch units to control energy flow between the battery and charge storage component.
1. A heating circuit for a battery, comprising:
a first switch unit, a second switch unit, a third switch unit, a fourth switch unit, a switching control module, a damping component, a current storage component, and a charge storage component; wherein:
the damping component and current storage component are connected with the battery to form at least a first part of a first loop;
the first switch unit and second switch unit are connected with each other and with the first part of the first loop to form at least a second part of the first loop;
the third switch unit and fourth switch unit are connected with each other and with the first part of the first loop to form at least a part of a second loop;
the charge storage component is connected across a first junction point of the first loop between the first switch unit and second switch unit and a second junction point of the second loop between the third switch unit and fourth switch unit, so that the first switch unit, charge storage component, and third switch unit form a first branch configured to transfer energy from the battery to the charge storage component and a second branch configured to transfer energy from the charge storage component to the battery, and the fourth switch unit, charge storage component, and second switch unit form a third branch configured to transfer energy from the battery to the charge storage component and a fourth branch configured to transfer energy from the charge storage component to the battery; and
the switching control module is connected with the first switch unit, the second switch unit, the third switch unit, and the fourth switch unit respectively, and is configured to control switching on and off of the first switch unit, the second switch unit, the third switch unit, and the fourth switch unit, so as to control the energy flow between the battery and the charge storage component.
2. The heating circuit according to claim 1 , wherein: the damping component is a parasitic resistance within the battery, and the current storage component is a parasitic inductance within the battery.
3. The heating circuit according to claim 1 , wherein: the damping component is a resistor external to the battery, the current storage component is an inductor, and the charge storage component is a capacitor external to the battery.
4. The heating circuit according to claim 1 , wherein: the first switch unit, the second switch unit, the third switch unit, and the fourth switch unit are two-way switches.
5. The heating circuit according to claim 1 , wherein: at least one of the first switch unit, the second switch unit, the third switch unit, and the fourth switch unit is composed of two one-way switches connected in parallel opposite to each other.
6. The heating circuit according to claim 1 , wherein: at least one of the first switch unit, the second switch unit, the third switch unit, and the fourth switch unit is composed of two two-way switches connected in series opposite to each other.
7. The heating circuit according to claim 1 , wherein: the heating circuit further comprises a resistor connected in series with the first branch and/or the second branch, and/or a resistor connected in series with the third branch and/or the fourth branch.
8. The heating circuit according to claim 1 , wherein: the switching control module is configured to control the first switch unit and third switch unit to switch off when or after the current flow through the charge storage component reaches zero after a current flow cycle, after the first switch unit and third switch unit switch on, and is also configured to control the second switch unit and fourth switch unit to switch off when or after the current flow through the charge storage component reaches zero after a current flow cycle, after the second switch unit and the fourth switch unit switch on.