US 11,942,810 B2
Apparatus and method for controlling operation of secondary battery using relative deterioration degree of electrode
Yoon-Jung Bae, Daejeon (KR); Ji-Yeon Kim, Daejeon (KR); and Kyung-Hwa Woo, Daejeon (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR)
Appl. No. 17/612,015
Filed by LG Energy Solution, Ltd., Seoul (KR)
PCT Filed Oct. 23, 2020, PCT No. PCT/KR2020/014620
§ 371(c)(1), (2) Date Nov. 17, 2021,
PCT Pub. No. WO2021/118049, PCT Pub. Date Jun. 17, 2021.
Claims priority of application No. 10-2019-0164888 (KR), filed on Dec. 11, 2019.
Prior Publication US 2022/0231515 A1, Jul. 21, 2022
Int. Cl. H02J 7/00 (2006.01); B60L 58/12 (2019.01); B60L 58/16 (2019.01); G01R 31/389 (2019.01); G01R 31/392 (2019.01); H01M 10/42 (2006.01); H01M 10/44 (2006.01); H01M 10/48 (2006.01)
CPC H02J 7/005 (2020.01) [B60L 58/12 (2019.02); B60L 58/16 (2019.02); G01R 31/389 (2019.01); G01R 31/392 (2019.01); H01M 10/425 (2013.01); H01M 10/443 (2013.01); H01M 10/486 (2013.01); H02J 7/0048 (2020.01); H01M 2010/4271 (2013.01); H01M 2220/20 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An apparatus for controlling an operation of a secondary battery using a relative deterioration degree of an electrode, comprising:
a sensor configured to measure voltage, current and temperature of the secondary battery; and
a control unit operatively coupled to the sensor unit,
wherein the control unit is configured to:
receive the measured voltage, current and temperature of the secondary battery from the sensor unit,
determine a State Of Charge (SOC) of the secondary battery in response to a pulse current flowing through the secondary battery in a preset deterioration diagnosing SOC section, wherein the pulse current includes each of a charging/discharging section and a rest section;
determine an electrochemical reaction resistance from a voltage change amount measured during a preset initial time in each section of the pulse current and determine an ion diffusion resistance from a voltage change amount measured during a remaining time in each section of the pulse current excluding the initial time,
determine a deterioration-biased electrode by comparing a deterioration diagnosing resistance ratio, which is a ratio of the ion diffusion resistance to the electrochemical reaction resistance, with a preset reference deterioration diagnosing resistance ratio, and
adaptively adjust an operation condition of a next charging/discharging cycle according to the determined deterioration-biased electrode.