Charging method, charging equipment, and integrated circuit
First Claim
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1. A charging method for a secondary battery, comprising:
- detecting a charging current;
changing over a voltage applied to said secondary battery to a second voltage lower than a first voltage when said charging current reaches a first charging current corresponding to a substantially charged condition of said secondary battery during charging while said first voltage is applied to said secondary battery; and
changing over said voltage applied to said secondary battery to said first voltage when said charging current exceeds a second charging current corresponding to a discharging battery voltage while said second voltage is applied to said secondary battery.
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Abstract
When a secondary battery such as a lithium ion battery, etc. requiring constant-voltage charging is charged, the battery voltage and charging current of the secondary battery are detected under a specified state, and in accord with the detected state, a voltage at which charging is carried out, the charging time or charging stop period thereof, or connecting condition of the charging circuit etc. are controlled in order to favorably charge the secondary battery to a full-charge or to a nearly full-charged state, thereby effectively preventing deterioration of characteristics of the secondary battery.
101 Citations
65 Claims
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1. A charging method for a secondary battery, comprising:
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detecting a charging current; changing over a voltage applied to said secondary battery to a second voltage lower than a first voltage when said charging current reaches a first charging current corresponding to a substantially charged condition of said secondary battery during charging while said first voltage is applied to said secondary battery; and changing over said voltage applied to said secondary battery to said first voltage when said charging current exceeds a second charging current corresponding to a discharging battery voltage while said second voltage is applied to said secondary battery. - View Dependent Claims (2, 3, 4)
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5. A charging method for a secondary battery, comprising:
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detecting a charging current; changing over a voltage applied to said secondary battery to a second voltage lower than a first voltage when a voltage of said secondary battery corresponding to a substantially charged condition is detected during charging said secondary battery while applying said first voltage; and changing over said voltage applied to said secondary battery to said first voltage when said charging current reaches a specified charging current while said second voltage is applied to said secondary battery. - View Dependent Claims (6, 7)
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8. A charging method for a secondary battery, comprising:
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detecting a potential across respective ends of a switching means for controlling a supply of a charging power supply to said secondary battery and a potential across respective ends of said secondary battery while a low-voltage charging power supply is fed to said secondary battery; and turning on said switching means based on said detected potentials for starting charging of said secondary battery with said supply of said charging power supply being fed to said secondary battery at a specified voltage. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A charging equipment for a secondary battery, comprising:
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first voltage feeding means for feeding a first voltage to said secondary battery; second voltage feeding means for feeding a second voltage lower than said first voltage to said secondary battery; current detection means for detecting a charging current to said secondary battery; and control means for changing over said first voltage feeding means to said second voltage feeding means based on an output of said current detection means, wherein when said current detecting means detects a first charging current corresponding to a substantially charged condition of said secondary battery said first voltage feeding means is changed over to said second voltage feeding means, and when said current detection means detects a current exceeding a second charging current while said second voltage feeding means is applied, said second voltage feeding means is changed over to said first voltage feeding means. - View Dependent Claims (27, 28, 29)
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30. A charging equipment for a secondary battery, comprising;
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first voltage feeding means for feeding a first voltage to said secondary battery; second voltage feeding means for feeding a second voltage lower than said first voltage to said secondary battery; current detection means for detecting a charging current to said secondary battery; voltage detection means for detecting a secondary battery voltage; and control means for changing over said first voltage feeding means to said second voltage feeding means based on outputs of said voltage and current detection means, wherein when a specified voltage corresponding to a substantially charged condition of said secondary battery is detected by the voltage detection means said first voltage feeding means is changed over to said second voltage feeding means, and when said current detection means detects a current exceeding a specified charging current while said second voltage feeding means is applied to said secondary battery said second voltage feeding means is changed over to said first voltage feeding means. - View Dependent Claims (31, 32)
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33. A charging equipment for a secondary battery, comprising:
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a power supply circuit for feeding a charging power to said secondary battery; switching means for controlling said power supply circuit feed to said secondary battery; detecting means for detecting a potential across respective ends of said switching means and a potential across respective ends of said secondary battery while a low-voltage charging power is fed from said power supply circuit to said secondary battery; and charging control means for starting charging of said secondary battery by turning on said switching means in response to said detected potentials by said detection means and for controlling said power supply circuit to feed a specified voltage to said secondary battery. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47)
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48. An integrated circuit for controlling charging of a secondary battery, in which a charging current to said secondary battery is detected and control is carried out for selectively supplying a first voltage and a second voltage lower than said first voltage to said secondary battery, wherein
when said secondary battery is judged to be at a substantially charged condition based on a first value of said detected charging current while said first voltage is applied to said secondary battery said first voltage is changed over to said second voltage, and when said secondary battery is judged to be in a discharging condition based on a second value of said detected charging current while said second voltage is applied to said secondary battery, said second voltage is changed over to said first voltage.
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51. An integrated circuit for controlling charging of a secondary battery, in which a charging current to said secondary battery is detected and control is carried out for selectively supplying a first voltage and a second voltage lower than said first voltage to said secondary battery, wherein
when said secondary batter is judged to be at a substantially charged condition based on a value of a detected charging voltage while said first voltage is applied to said secondary battery said first voltage is changed over to said second voltage, and when said secondary battery is judged to be in a discharging condition based on a value of said detected charging current while said second voltage is applied to said secondary battery, said second voltage is changed over to said first voltage.
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54. An integrated circuit for controlling charging of a secondary battery, wherein
a potential across respective ends of a switching means for controlling a supply of a charging power supply to said secondary battery and a potential across respective ends of said secondary battery is detected while a low-voltage charging power supply is fed to said secondary battery, and said switching means is controlled based on said detected potentials for starting charging of said secondary battery with said supply of said charging power supply supplied being fed to said secondary battery at a specified voltage.
Specification