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Controlling re-charge of a nickel metal-hydride (NiMH) or nickel cadmuim (NiCd) battery
| Details |
Inventors: Hoff, C. Michael; Nelson, James E.;
Assignee: American Power Conversion (West Kingston, RI)
Primary Examiner: Tso; Edward H.
Assistant Examiner:
Attorney, Agent or Firm: Mintz, Levin, Cohn, Ferris, Glovsky and Popeo, P.C. Mirabito, Esq.; A. Jason McCarthy, Esq.; Alison L.
A method of charging a NiMH or NiCd battery such that charging does not occupy a substantial amount of time and such that the operating temperature of the battery is reduced during the lifetime of the battery, thereby extending the life of the battery. This invention is a method of charging that is accomplished using a temperature differential method to continuously regulate the rate of charge injected into the battery. An amplifier is used to amplify the difference in temperature between one or more cases in which the battery is contained and ambient temperature. In this method, the greater the difference in temperature, the lower the charging current is injected into the battery. The method of charging may be incorporated into uninterruptible power supply equipment. |
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DETAILED DESCRIPTION It is desirable to have a method of charging a NiMH or NiCd battery such that charging does not occupy a substantial amount of time and such that the overall operating temperature of the battery during use and especially charging is reduced during the lifetime of the battery, thereby extending the life of the battery.
This invention is directed to a method of charging that is accomplished using a temperature differential method to continuously regulate the rate of charge injected into the battery.
An amplifier is used to amplify the detected or sensed difference in temperature between the one or more cases in which the battery or batteries are contained and ambient temperature.
In this method, the greater the difference in temperature, the lower the charging current is injected into the battery.
In one general aspect, the invention features a power supply system including a power input to receive input power from a power source, a power output to provide output power to the battery(s), at least one NiMH or NiCd battery, a charger coupled to the power input and the battery to convert input power and output it in a regulated manner to the battery, a controller, coupled to the charger, constructed and arranged to monitor and control the power from the charger into the battery.
In general, in another aspect, the invention is directed to a method of charging a battery.
The method of charging comprises detecting at least one battery, sensing a first temperature at a point proximal to the battery, sensing a second temperature at a point distal to the battery, and controlling current into the battery according to a difference between the first temperature and the second temperature.
The invention provides one or more of the following advantages.
The charging method of the invention improves the electrical efficiency of the charge process as the battery is charged to a 100% state of charge as quickly as the battery can accept charge.
One hundred percent SOC is maintained in the battery without overheating the cells of the battery and by matching the rate of self-discharge with changes based on the battery age and ambient conditions
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