Power storage device and charging method thereof
First Claim
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1. A power storage device comprising:
- a power storage unit comprising a secondary battery;
a detecting circuit configured to detect a capacity of the secondary battery;
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, after the first charging, the capacity with the value stored in the memory,wherein at least one of the first to third circuits comprises a transistor comprising an oxide semiconductor film in a channel formation region,wherein the second circuit is configured to start the second charging, andwherein the third circuit is configured to terminate the second charging when a resistance of the secondary battery reaches a predetermined resistance.
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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.
17 Citations
19 Claims
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1. A power storage device comprising:
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a power storage unit comprising a secondary battery; a detecting circuit configured to detect a capacity of the secondary battery; 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, after the first charging, the capacity with the value stored in the memory, wherein at least one of the first to third circuits comprises a transistor comprising an oxide semiconductor film in a channel formation region, 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 secondary battery reaches a predetermined resistance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. 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 at least one of the first to third circuits comprises a transistor comprising an oxide semiconductor film in a channel formation region, wherein the first circuit is configured to compare, after the first charging, the capacity with the value stored in the memory, 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.
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15. 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, after the first charging, the capacity with the value stored in the memory, wherein the second circuit is configured to start the second charging, wherein the power storage device is configured to charge with a constant voltage charging at a first voltage after a constant current charging during the first charging, wherein the power storage device is configured to charge with a second voltage during the second charging, wherein the third circuit is configured to terminate the second charging when a resistance of the power storage unit reaches a predetermined resistance, and wherein at least one of the first to third circuits comprises a transistor comprising an oxide semiconductor film in a channel formation region. - View Dependent Claims (16, 17, 18, 19)
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Specification
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Current AssigneeSemiconductor Energy Laboratory Co., Ltd.
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Original AssigneeSemiconductor Energy Laboratory Co., Ltd.
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InventorsMomo, Junpei, Miyake, Hiroyuki, Takahashi, Kei
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Primary Examiner(s)BOATENG, ALEXIS ASIEDUA
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Application NumberUS14/136,503Publication NumberTime in Patent Office1,117 DaysField of Search320/160, 320/134, 320/116, 320/103, 320/107, 320/128, 320/132, 320/137, 320/148, 320/112, 320/122, 320/138, 320/139, 320/147, 320/155, 429/90, 429/160, 429/16US Class Current1/1CPC Class CodesB60L 53/12 Inductive energy transferB60L 53/14 Conductive energy transferG01R 31/382 Arrangements for monitoring...H01M 10/0525 Rocking-chair batteries, i....H01M 10/44 Methods for charging or dis...H01M 4/625 Carbon or graphiteH02J 7/00 Circuit arrangements for ch...H02J 7/0068 Battery or charger load swi...H02J 7/0069 Charging or discharging for...Y02E 60/10 Energy storage using batteriesY02T 10/70 Energy storage systems for ...Y02T 10/7072 Electromobility specific ch...Y02T 90/14 Plug-in electric vehicles
