System for controlling charging of secondary battery
First Claim
1. A system for controlling charging of a secondary battery, comprising:
- first charging control means for stopping the charging when a charging voltage reaches a specific first cut-off voltage corresponding to a charge capacity less than a full-charge level; and
temperature correcting means for correcting said first cut-off voltage on the basis of a deviation between a present environmental temperature and a reference environmental temperature,wherein the system charges the secondary battery under control of the first charging control means for number of times that is determined by a randomly selected number, and then the system charges the secondary battery under control of second charging control means.
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Accused Products
Abstract
To provide a system for controlling the charging of a secondary battery (battery), which is capable of keeping an initial charging/discharging characteristic of the battery in consideration of a change in environmental temperature and deterioration of the battery with elapsed time. An ordinary charging portion for performing a first charging control specified to stop the charging at a charge level less than a full-charge level is used in combination with a refresh charging portion for performing a second charging control specified to stop the charging at a charge level more than the full charge level. After the charging by the ordinary charging portion is continuously repeated by a specific number of times, for example, ten times, the next charging is performed by the refresh charging portion. The cut-off voltage used for the ordinary charging portion and refresh charging portion is determined by correcting a reference voltage VO on the basis of an environmental temperature TAO detected by an environmental temperature detecting portion. The deterioration of the battery is corrected on the basis of a reference full-charge voltage, an initial full-charge voltage Vmax(1), a present full-charge voltage Vmax(n), an initial maximum battery temperature Tmax(1), and a present maximum battery temperature Tmax(n).
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Citations
16 Claims
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1. A system for controlling charging of a secondary battery, comprising:
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first charging control means for stopping the charging when a charging voltage reaches a specific first cut-off voltage corresponding to a charge capacity less than a full-charge level; and temperature correcting means for correcting said first cut-off voltage on the basis of a deviation between a present environmental temperature and a reference environmental temperature, wherein the system charges the secondary battery under control of the first charging control means for number of times that is determined by a randomly selected number, and then the system charges the secondary battery under control of second charging control means. - View Dependent Claims (2, 3, 4, 5, 6, 13, 14)
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7. A method for controlling the charging of a secondary battery, comprising the following steps:
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stopping the charging by a first charging control means when a charging voltage reaches a specific first cut-off voltage corresponding to a charge capacity less than a full-charge level; and correcting said first cut-off voltage on the basis of a deviation between a present environmental temperature and a reference environmental temperature; wherein the system charges the secondary battery under control of the first charging control means for number of times that is determined by a randomly selected number, and then the system charges the secondary battery under control of second charging control means. - View Dependent Claims (8, 9, 10, 11, 12, 15, 16)
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Specification