US 12,272,974 B2
Rechargeable battery pack and handheld vacuum cleaner
Jian Xu, Beijing (CN); and Peng Lei, Beijing (CN)
Assigned to Beijing Roborock Technology Co., Ltd., Beijing (CN)
Appl. No. 17/623,307
Filed by Beijing Roborock Technology Co., Ltd., Beijing (CN)
PCT Filed Jun. 28, 2020, PCT No. PCT/CN2020/098610
§ 371(c)(1), (2) Date Dec. 28, 2021,
PCT Pub. No. WO2020/259702, PCT Pub. Date Dec. 30, 2020.
Claims priority of application No. 201920987295.4 (CN), filed on Jun. 28, 2019.
Prior Publication US 2022/0376538 A1, Nov. 24, 2022
Int. Cl. H01M 10/46 (2006.01); A47L 9/28 (2006.01); H02J 7/00 (2006.01)
CPC H02J 7/00302 (2020.01) [A47L 9/2884 (2013.01); H02J 7/00304 (2020.01)] 19 Claims
OG exemplary drawing
 
1. A rechargeable battery pack, comprising:
a polymer cell, comprising at least one polymer cell unit;
a charger input terminal, electrically connected to the polymer cell, wherein the polymer cell is charged through the charger input terminal;
a power interface, electrically connected to the polymer cell, and configured to supply power to the handheld vacuum cleaner when the rechargeable battery pack is connected to a handheld vacuum cleaner; and
a protective circuit module (PCM) board, wherein the PCM board comprises a power management chip and a peripheral balancing circuit connected between the polymer cell and the power management chip,
wherein the polymer cell comprises at least two polymer cell units connected in series;
the peripheral balancing circuit comprises a plurality of balancing circuit units that correspond to the at least two polymer cell units in one-to-one manner; and
the power management chip is configured to: monitor a voltage difference between the at least two polymer cell units, control a corresponding balancing circuit unit to be turned on to reduce the voltage difference upon detecting that the voltage difference exceeds a predetermined value; and control the corresponding balancing circuit unit to keep turned off upon detecting that the voltage difference is less than the predetermined value.