Method for charging secondary battery using multiple charging sections
AssigneeLG Chem, Ltd.
InventorsJun Hyuk Song, Joo Sung Lee
Life of this patent
Estimating the term…
Abstract
A method of charging a secondary battery, including first, second and third charging sections in which a CC-charging performed as first, second, and third Crate (C1, C2, C3), respectively, is supplied until the voltage of the secondary battery reaches a respective first, second and third charging cutoff voltage (V1), (V2), (V3) and a CV-charging is performed as the respective charging C-rate gradually decreases in response to reaching the respective charging cutoff voltage (V1), (V2), (V3), wherein the charging cutoff voltage satisfies the V1=n−(0.25˜0.15), V2 n−(0.2˜0.1), and V3=n (here, ‘n’ is an electric potential at the full charge of the secondary battery), and V1<V2<V3.
Claims20
A method of charging a secondary battery, including charging sections by preset C-rates, and performing a constant current-constant voltage (CC-CV) charging in each of the charging sections,
- wherein the charging sections comprise:
- a first charging section in which a CC-charging is performed as a first C-rate (C1) is supplied until the voltage of the secondary battery reaches a first charging cutoff voltage (V1), and a CV-charging is performed as a charging C-rate gradually decreases in response to reaching the first charging cutoff voltage (V1);
- a second charging section in which a CC-charging is performed as a second C-rate (C2) is supplied until the voltage of the secondary battery reaches a second charging cutoff voltage (V2), and a CV-charging is performed as the charging C-rate gradually decreases in response to reaching the second charging cutoff voltage (V2);
- and
- a third charging section in which a CC-charging is performed as a third C-rate (C3) is supplied until the voltage of the secondary battery reaches a third charging cutoff voltage (V3), and a CV-charging is performed as the charging C-rate gradually decreases in response to reaching the third charging cutoff voltage (V3),
- wherein the charging cutoff voltage satisfies the V1=n−(0.25˜0.15), V2=n−(0.2˜0.1), and V3=n (here, ‘n’ is an electric potential at the full charge of the secondary battery), and V1<V2<V3, and
- wherein C1=3.3C, C2=2.5C and C3=0.8C.
A method of charging a secondary battery, including charging sections by preset C-rates, and performing a constant current-constant voltage (CC-CV) charging in each of the charging sections,
- wherein the charging sections comprise:
- a first charging section in which a CC-charging is performed as a first C-rate (C1) is supplied until the voltage of the secondary battery reaches a first charging cutoff voltage (V1), and a CV-charging is performed as a charging C-rate gradually decreases in response to reaching the first charging cutoff voltage (V1);
- a second charging section in which a CC-charging is performed as a second C-rate (C2) is supplied until the voltage of the secondary battery reaches a second charging cutoff voltage (V2), and a CV-charging is performed as the charging C-rate gradually decreases in response to reaching the second charging cutoff voltage (V2);
- and
- a third charging section in which a CC-charging is performed as a third C-rate (C3) is supplied until the voltage of the secondary battery reaches a third charging cutoff voltage (V3), and a CV-charging is performed as the charging C-rate gradually decreases in response to reaching the third charging cutoff voltage (V3),
- wherein the charging cutoff voltage satisfies the V1=n−(0.25˜0.15), V2=n−(0.2˜0.1), and V3=n (here, ‘n’ is an electric potential at the full charge of the secondary battery), and V1<V2<V3, and
- wherein C1=2.0C, C2=1.5C and C3=0.5C.
Dependencies are inferred from the claim text.