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US 9,866,052 B2Granted
Secondary battery charging system and method, and battery pack
AssigneeSanyo Electric Co., Ltd.
InventorsKenichi Honoki, Masato Fujikawa, Shin-Ichi Yuasa
Life of this patent
Estimating the term…
Abstract
Even after the battery reaches the last stage of the end of life, the use can be continued. A charging system includes battery pack and charger. During the charge of lithium-ion secondary battery, charge control unit calculates the full charge capacity maintaining rate, sets a first charge current value on the basis of the full charge capacity maintaining rate, and charges the battery. When lithium-ion secondary battery reaches the last stage of the end of life, charge control unit sets a second charge current value lower than the first charge current value set based on the full charge capacity maintaining rate, and charges the battery.
Claims18
A charging system of a secondary battery comprising:
- a secondary battery;
- a charger for charging the secondary battery;
- means configured to sequentially calculate a full charge capacity of the secondary battery;
- means configured to sequentially calculate a degree of variation from a full charge capacity in an initial state based on the calculated full charge capacity;
- detecting means configured to detect that the secondary battery is at an end of life;
- and
- charge controlling means configured to:
- when the secondary battery is not at the last stage of the end of life, set a first charge current value or a first charge power value based on the degree of variation calculated when the secondary battery is not at the last stage of the end of life, and charge the secondary battery using the first charge current value or the first charge power value, and
- when the secondary battery is at the last stage of the end of life, set a second charge current value lower than the first charge current value based on the degree of variation calculated when the secondary battery is at the last stage of the end of life or a second charge power value lower than the first charge power value based on the degree of variation calculated when the secondary battery using the second charge current value or the second charge power value is at the last stage of the end of life, and charge the secondary battery.
6 more elements
A battery pack comprising:
- a secondary battery;
- means configured to sequentially calculate a full charge capacity of the secondary battery;
- means configured to sequentially calculate a degree of variation from a full charge capacity in an initial state based on the calculated full charge capacity;
- detecting means configured to detect that the secondary battery is at an end of life;
- and
- charge controlling means configured to output a control signal to a charger so as to:
- when the secondary battery is not at the last stage of the end of life, set a first charge current value or a first charge power value based on the degree of variation calculated when the secondary battery is not at the last stage of the end of life, and charge the secondary battery using the first charge current value or the first charge power value, and
- when the secondary battery is at the last stage of the end of life, set a second charge current value lower than the first charge current value based on the degree of variation calculated when the secondary battery using the second charge current value or the second charge power value is at the last stage of the end of life or a second charge power value lower than the first charge power value based on the degree of variation calculated when the secondary battery is at the last stage of the end of life, and charge the secondary battery.
5 more elements
A charging method of a secondary battery comprising:
- sequentially calculating a full charge capacity of the secondary battery;
- sequentially calculating a degree of variation from a full charge capacity in an initial state based on the calculated full charge capacity;
- detecting that the secondary battery is at an end of life;
- and
- when the secondary battery is not at the last stage of the end of life, setting a first charge current value or a first charge power value based on the degree of variation calculated when the secondary battery is not at the last stage of the end of life, and charging the secondary battery using the first charge current value or the first charge power value, and
- when the secondary battery is at the last stage of the end of life, setting a second charge current value lower than the first charge current value based on the degree of variation calculated when the secondary battery is at the last stage of the end of life or a second charge power value lower than the first charge power value based on the degree of variation calculated when the secondary battery using the second charge current value or the second charge power value is at the last stage of the end of life, and charging the secondary battery.
3 more elements
Dependencies are inferred from the claim text.