US 11,811,024 B2
BMS and battery system
Jung Hwan Park, Daejeon (KR); Woo Jung Kim, Daejeon (KR); and Yong Sug Choi, Daejeon (KR)
Assigned to SK On Co., Ltd., Seoul (KR)
Filed by SK On Co., Ltd., Seoul (KR)
Filed on May 10, 2022, as Appl. No. 17/740,964.
Claims priority of application No. 10-2021-0060690 (KR), filed on May 11, 2021.
Prior Publication US 2022/0367926 A1, Nov. 17, 2022
Int. Cl. G01R 31/00 (2006.01); H01M 10/42 (2006.01); H02J 7/00 (2006.01); G01R 31/327 (2006.01); H01M 10/48 (2006.01); H01M 10/44 (2006.01); H01M 10/46 (2006.01); G01R 31/3832 (2019.01)
CPC H01M 10/425 (2013.01) [G01R 31/3278 (2013.01); G01R 31/3832 (2019.01); H01M 10/441 (2013.01); H01M 10/46 (2013.01); H01M 10/482 (2013.01); H02J 7/0063 (2013.01); H01M 2010/4271 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A battery management system (BMS) that measures a voltage of a circuit inside a battery system, the battery management system comprising:
a voltage measurement module including first to n-th voltage measurement units for measuring a voltage;
switch modules provided between the first to n-th voltage measurement units and the circuit inside the battery system, respectively, and including first to n-th switches for forming or blocking an electrical path;
a diagnostic power source that provides a constant voltage;
changeover switches provided between the first to n-th voltage measurement units and the diagnostic power source and electrically connecting the diagnostic power source to any one selected from the first to n-th voltage measurement units; and
a control unit controlling the switch modules and the changeover switches, and calculating voltage information of the circuit inside the battery system based on voltage information obtained from the voltage measurement module,
wherein the control unit is configured to:
calculate a correction amount of an i-th voltage measurement unit based on voltage information measured by the i-th voltage measurement unit, when the BMS and the circuit inside the battery system are separated and the i-th voltage measurement unit, which is any one of the first to n-th voltage measurement units, is electrically connected to the diagnostic power source, and
calculate the voltage information of the circuit inside the battery system by reflecting the correction amount to the voltage information measured by the i-th voltage measurement unit, when an i-th switch, which is any one of the first to n-th switch, is turned on and the i-th voltage measurement unit is connected to the circuit inside the battery system,
wherein n (natural number)≥1, and n (natural number)≥i (natural number)≥1.