Lithium-ion secondary battery system
First Claim
1. A lithium-ion secondary battery system comprising:
- a lithium-ion secondary battery having a cathode, an anode including carbon, and a non-aqueous electrolyte [doesn'"'"'t teach this];
a charge/discharge circuit for putting the lithium-ion secondary battery on charge according to a charge control parameter; and
an arithmetic processing section for controlling the charge/discharge circuit,wherein the arithmetic processing section obtains battery characteristics of the lithium-ion secondary battery, changes a value of the charge control parameter when the arithmetic processing section determines that the battery characteristics satisfies a condition for changing the charge control parameter, and restores the value of the charge control parameter to the value before the change when the charge for the lithium-ion secondary battery is finished,wherein the arithmetic processing section obtains an integrated value of a discharge capacity and a ratio of an amount of voltage change and the discharge capacity as the battery characteristics, changes the value of the charge control parameter when the arithmetic processing section determines that the ratio and the integrated value satisfy respective conditions for changing the charge control parameter, and restores the value of the charge control parameter to the value before the change when the charge for the lithium-ion secondary battery is finished.
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Accused Products
Abstract
A lithium-ion secondary battery system is provided which can improve the cycle life and the storage property of a lithium-ion secondary battery and can decrease a discharge capacity which cannot be recharged. The lithium-ion secondary battery system includes a lithium-ion secondary battery having a cathode, an anode including carbon, and a non-aqueous electrolyte; a charge/discharge circuit for putting the lithium-ion secondary battery on charge according to a charge control parameter; and an arithmetic processing section for controlling the charge/discharge circuit. The arithmetic processing section obtains battery characteristics of the lithium-ion secondary battery, changes a value of the charge control parameter when the arithmetic processing section determines that the battery characteristics satisfies a condition for changing the charge control parameter, and restores the value of the charge control parameter to the value before the change when the charge for the lithium-ion secondary battery is finished.
13 Citations
12 Claims
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1. A lithium-ion secondary battery system comprising:
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a lithium-ion secondary battery having a cathode, an anode including carbon, and a non-aqueous electrolyte [doesn'"'"'t teach this]; a charge/discharge circuit for putting the lithium-ion secondary battery on charge according to a charge control parameter; and an arithmetic processing section for controlling the charge/discharge circuit, wherein the arithmetic processing section obtains battery characteristics of the lithium-ion secondary battery, changes a value of the charge control parameter when the arithmetic processing section determines that the battery characteristics satisfies a condition for changing the charge control parameter, and restores the value of the charge control parameter to the value before the change when the charge for the lithium-ion secondary battery is finished, wherein the arithmetic processing section obtains an integrated value of a discharge capacity and a ratio of an amount of voltage change and the discharge capacity as the battery characteristics, changes the value of the charge control parameter when the arithmetic processing section determines that the ratio and the integrated value satisfy respective conditions for changing the charge control parameter, and restores the value of the charge control parameter to the value before the change when the charge for the lithium-ion secondary battery is finished. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A lithium-ion secondary battery system comprising:
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a lithium-ion secondary battery having a cathode, an anode including carbon, and a non-aqueous electrolyte; a charge/discharge circuit for putting the lithium-ion secondary battery on charge according to a charge control parameter; and an arithmetic processing section for controlling the charge/discharge circuit, wherein the arithmetic processing section obtains battery characteristics of the lithium-ion secondary battery, changes a value of the charge control parameter when the arithmetic processing section determines that the battery characteristics satisfies a condition for changing the charge control parameter, and restores the value of the charge control parameter to the value before the change when the charge for the lithium-ion secondary battery is finished, wherein the arithmetic processing section obtains an integrated value of the a discharge capacity and a ratio of an amount of temperature change in time and the discharge capacity as the battery characteristics, increases time or voltage of constant-voltage charge which is the charge control parameter when the arithmetic processing section determines that the ratio and the integrated value satisfy respective conditions for changing the charge control parameter, and restores the time or the voltage of the constant-voltage charge to the value before the change when the charge for the lithium-ion secondary battery is finished. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification