US 12,407,174 B2
Battery equalization self-discharging circuit and unmanned aerial vehicle
Wei Qin, Guangdong (CN)
Assigned to AUTEL ROBOTICS CO., LTD., Guangdong (CN)
Filed by AUTEL ROBOTICS CO., LTD., Guangdong (CN)
Filed on Feb. 17, 2022, as Appl. No. 17/651,499.
Application 17/651,499 is a continuation of application No. PCT/CN2020/122087, filed on Oct. 20, 2020.
Claims priority of application No. 201910770160.7 (CN), filed on Aug. 20, 2019.
Prior Publication US 2022/0173599 A1, Jun. 2, 2022
Int. Cl. H02J 7/00 (2006.01); B60L 58/22 (2019.01); G01R 31/3828 (2019.01)
CPC H02J 7/0016 (2013.01) [B60L 58/22 (2019.02); G01R 31/3828 (2019.01); H02J 7/0024 (2013.01); B60L 2200/10 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A battery equalization self-discharging circuit, wherein the circuit comprises:
a microprocessor, at least two battery cells connected in series between a first electrode of a battery and a second electrode of the battery, and at least two battery cell equalization units for equalizing voltages of the at least two battery cells respectively;
each of the battery cell equalization units comprises a discharging load and a switch connected in series, the discharging load is electrically connected to one end of a battery cell corresponding to the battery cell equalization unit, and the switch is electrically connected to the other end of the battery cell corresponding to the battery cell equalization unit, a control end of the switch is electrically connected to the microprocessor;
in the at least two battery cells, the battery cell connected adjacent to the second electrode of the battery is a third battery cell, a first end of the third battery cell is connected to other battery cells in the at least two battery cells, and a second end of the third battery cell is connected to the second electrode of the battery;
the battery equalization unit corresponding to the third battery cell comprises a third discharging load and a third switch, a first end of the third discharging load is connected to the first end of the third battery cell, a second end of the third discharging load is connected to a first end of the third switch, and a second end of the third switch is connected to the second end of the third battery cell; and
the battery equalization self-discharging circuit further comprises a fourth switch and a current detection unit, the second end of the third discharging load is connected to the second end of the third battery cell through the fourth switch and the current detection unit sequentially, and a control end of the fourth switch is connected to the microprocessor.