发明名称 |
POWER STORAGE DEVICE AND CHARGING METHOD THEREOF |
摘要 |
An object is to inhibit a decrease in the capacity of a power storage device or to compensate the capacity, by adjusting or rectifying an imbalance between a positive electrode and a negative electrode, which is caused by decomposition of an electrolyte solution at the negative electrode. Provided is a charging method of a power storage device including a positive electrode using an active material that exhibits two-phase reaction, a negative electrode, and an electrolyte solution. The method includes the steps of, after constant current charging, performing constant voltage charging with a voltage that does not cause decomposition of the electrolyte solution until a charging current becomes lower than or equal to a lower current value limit; and after the constant voltage charging, performing additional charging with a voltage that causes decomposition of the electrolyte solution until a resistance of the power storage device reaches a predetermined resistance. |
申请公布号 |
US2014184172(A1) |
申请公布日期 |
2014.07.03 |
申请号 |
US201314136503 |
申请日期 |
2013.12.20 |
申请人 |
SEMICONDUCTOR ENERGY LABORATORY CO., LTD. |
发明人 |
MOMO Junpei;MIYAKE Hiroyuki;TAKAHASHI Kei |
分类号 |
H02J7/00 |
主分类号 |
H02J7/00 |
代理机构 |
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代理人 |
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主权项 |
1. A charging method of a power storage unit, comprising the steps of:
performing first charging with a first voltage; measuring a capacity of the power storage unit after the step of performing the first charging; comparing the capacity with a value stored in a memory; and performing second charging with a second voltage after the step of comparing the capacity with the value, wherein the second voltage is higher than the first voltage, and wherein the second charging is performed until a resistance of the power storage unit reaches a predetermined resistance. |
地址 |
Atsugi-shi JP |