Method of charging secondary battery by varying current or voltage at an inflection point in a storage region before full charge and device therefor
First Claim
1. A charging method for a secondary battery comprising an anode, a cathode, and an electrolyte and having an inflection point in a storage region before full charge in a potential curve of the anode, a potential curve of the cathode or an open-circuit voltage curve of the battery against storage quantity,wherein the battery is charged while at least one of a charging current and a charging voltage is subjected to variation with time, at least until the inflection point and, after the inflection point, a charging pattern selected from the group consisting of a charging voltage and a current waveform is changed.
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Accused Products
Abstract
Provided is a charging method of a secondary battery capable of reducing the irreversible quantity in initial charge and discharge cycles after production of the battery and improving charge and discharge cycle characteristics. The secondary battery is at least comprised of an anode, a cathode, and an electrolyte and has a curve of anode potential or cathode potential against storage quantity, or an open-circuit voltage curve against storage quantity with inflection points. A charging operation of the secondary battery is carried out in a predetermined wave form at least until the inflection point. After passing the inflection point, until a fully charged state is achieved, the charging is performed in a different pattern from that before the inflection point.
112 Citations
28 Claims
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1. A charging method for a secondary battery comprising an anode, a cathode, and an electrolyte and having an inflection point in a storage region before full charge in a potential curve of the anode, a potential curve of the cathode or an open-circuit voltage curve of the battery against storage quantity,
wherein the battery is charged while at least one of a charging current and a charging voltage is subjected to variation with time, at least until the inflection point and, after the inflection point, a charging pattern selected from the group consisting of a charging voltage and a current waveform is changed.
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17. A charging device for charging a secondary battery, said device comprising:
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a connection portion at least capable of electrically being connected to input and output terminals of a cathode and an anode of the secondary battery;
charging means for charging the secondary battery via the connection portion;
variation means for effecting variation with time of at least one of a charging current and a charging voltage of the charging means; and
switching means for switching a charge pattern of the charging means before a predetermined charge quantity to that after said charge quantity, wherein said predetermined charge quantity is a charge quantity corresponding to an inflection point in a storage region before full charge in a potential curve of the anode, a potential curve of the cathode or an open-circuit voltage curve of the battery against storage quantity. - View Dependent Claims (19, 20, 21, 22, 23, 24, 27, 28)
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18. An activation device for activating a secondary battery after assembly by charge and discharge, said device comprising:
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a connection portion at least capable of electrically being connected to input and output terminals of a cathode and an anode of the secondary battery;
charging means for charging the secondary battery via the connection portion;
variation means for effecting variation with time of at least one of a charging current and a charging voltage of the charging means;
switching means for switching a charge pattern of the charging means before a predetermined charge quantity to that after said charge quantity, wherein said predetermined charge quantity is a charge quantity corresponding to an inflection point in a storage region before full charge in a potential curve of the anode, a potential curve of the cathode or an open-circuit voltage curve of the battery against storage quantity;
discharging means for discharging the secondary battery; and
second switching means for switching electrical connection or disconnection between the secondary battery and the charging means or the discharging means. - View Dependent Claims (25, 26)
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Specification