US 12,249,740 B2
Secondary battery manufacturing method comprising divisional injection of electrolyte
Young Tae Kim, Daejeon (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR)
Appl. No. 18/275,141
Filed by LG ENERGY SOLUTION, LTD., Seoul (KR)
PCT Filed Oct. 13, 2022, PCT No. PCT/KR2022/015519
§ 371(c)(1), (2) Date Jul. 31, 2023,
PCT Pub. No. WO2023/080475, PCT Pub. Date May 11, 2023.
Claims priority of application No. 10-2021-0149103 (KR), filed on Nov. 2, 2021.
Prior Publication US 2024/0128621 A1, Apr. 18, 2024
Int. Cl. H01M 50/609 (2021.01)
CPC H01M 50/609 (2021.01) 9 Claims
 
1. A manufacturing method of a secondary battery comprising: firstly injecting electrolyte into a battery case having an electrode assembly located therein; secondly injecting electrolyte into the battery case after the firstly injected electrolyte; and sealing the battery case after the secondly injected electrolyte,
wherein an amount of the secondly injected electrolyte is determined by reflecting a correction value calculated from an average value of the amount of firstly injected electrolyte from n-ath (where a is 10≤a≤20, an integer) to nth earlier times, to a predetermined amount of the secondly injected electrolyte for the n+1th time, and
wherein the average value of the amount of firstly injected electrolyte is obtained through the process below:
calculating an average injection value (A) and a standard deviation (σ) of the amount of firstly injected electrolyte from n-ath (where a is 10≤a≤20, an integer) to nth times;
setting up a confidence interval from the average injection value (A) and the standard deviation (σ);
selecting values that fall within the set confidence interval among the number of ‘a’ of the amount of firstly injected electrolyte used for calculating the average injection value (A) and the standard deviation (σ); and
calculating the average value of the values that fall within the set confidence interval which is the average value in the confidence interval.