POWER STORAGE DEVICE AND CHARGING METHOD THEREOF
First Claim
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, andwherein the second charging is performed until a resistance of the power storage unit reaches a predetermined resistance.
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Accused Products
Abstract
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.
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Citations
18 Claims
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1. A charging method of a power storage unit, comprising the steps of:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A power storage device comprising:
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a detecting circuit configured to detect a capacity of a power storage unit; a memory configured to store a value; and a circuit configured to switch from first charging to second charging after the first charging is performed, the circuit comprising a first circuit, a second circuit, and a third circuit, wherein the first circuit is configured to compare the capacity with the value stored in the memory after the first charging, wherein the second circuit is configured to start the second charging, and wherein the third circuit is configured to terminate the second charging when a resistance of the power storage unit reaches a predetermined resistance. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification