US 12,068,465 B2
Secondary battery activation method with enhanced ability to detect low voltage
Jung Mi Lee, Daejeon (KR); Joon Sung Bae, Daejeon (KR); and Nak Gi Sung, Daejeon (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR)
Appl. No. 17/259,749
Filed by LG CHEM, LTD., Seoul (KR)
PCT Filed Jan. 3, 2020, PCT No. PCT/KR2020/000143
§ 371(c)(1), (2) Date Jan. 12, 2021,
PCT Pub. No. WO2020/141947, PCT Pub. Date Jul. 9, 2020.
Claims priority of application No. 10-2019-0000507 (KR), filed on Jan. 3, 2019.
Prior Publication US 2021/0135304 A1, May 6, 2021
Int. Cl. H01M 10/615 (2014.01); H01M 4/02 (2006.01); H01M 4/36 (2006.01); H01M 10/0525 (2010.01)
CPC H01M 10/615 (2015.04) [H01M 4/364 (2013.01); H01M 10/0525 (2013.01); H01M 2004/027 (2013.01); H01M 2004/028 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method for activating a secondary battery, the method comprising:
a pre-aging step of aging a secondary battery including a positive electrode containing a positive electrode active material, a negative electrode containing a negative electrode active material, a separator interposed between the positive electrode and the negative electrode, and an electrolyte, at a room temperature;
a charging step of primary charging the pre-aged secondary battery to 60% or more state of charge (SOC) of the secondary battery;
a high temperature aging step of aging the primary charged secondary battery at a temperature of 60° C. or higher; and
a room temperature aging step of aging the high temperature aging secondary battery at a room temperature,
wherein the charging step includes a first charging section up to 10% SOC of the secondary battery, a second charging section up to 40% SOC of the secondary battery, and a third charging section, which is a subsequent section, wherein, in the second charging section, charging is performed at a rate of 0.5 C or less,
wherein the charging rate in the second charging section is higher than the charging rate in the first charging section and the charging rate in the third charging section, and
wherein, in each charging section, the charging rate is constant.