Electricity: battery or capacitor charging or discharging – Battery or cell charging – With detection of current or voltage amplitude
Reexamination Certificate
2002-07-16
2003-09-23
Luk, Lawrence (Department: 2838)
Electricity: battery or capacitor charging or discharging
Battery or cell charging
With detection of current or voltage amplitude
C320S103000
Reexamination Certificate
active
06624616
ABSTRACT:
BACKGROUND
1. Field of the Invention
The present invention relates generally to battery chargers. More particularly, the present invention relates to a portable battery recharge station that can utilize a number of different portable power sources for recharging different types of secondary batteries of a variety of portable devices.
2. Background of the Invention
Many electrical appliances and electronic devices are portable. Specific examples of portable devices include wireless telephones, laptop computers, camcorders, pocket PCs, and toys. Some of these portable devices use primary batteries, e.g., alkaline batteries. Most of them, however, are powered by different types of rechargeable or secondary batteries. Examples of the types of secondary batteries include nickel-cadmium (NiCd), nickel-hydrogen (NiH
2
), nickel-metal hydride (NiMH), lithium ion (Li-ion), lithium polymer (Li-polymer), and lead acid batteries. Although zinc-air batteries have been widely used as primary batteries, they are also gaining popularity for use as secondary batteries.
Portable devices become disabled or inoperable when the power of their batteries drop below certain threshold. At that time, users of the portable devices must either replace depleted primary batteries with new primary batteries, or find a power source to recharge secondary batteries.
As known in the art, each portable device that uses a secondary battery is equipped with a unique charger dedicated to recharge the secondary battery. In other words, a typical consumer having three different types of portable devices may have three different battery chargers. For example, the consumer may have a first battery charger for his wireless telephone, a second battery charger for his camcorder, and a third battery charger for his Pocket PC. These three battery chargers are not interchangeable. In other words, the first battery charger may not be used for the camcorder or the Pocket PC. As a result, users of these battery chargers must carry all three chargers along with their portable devices. Accordingly, there is a need for a universal battery charger for multiple portable devices.
A typical secondary battery can be recharged using one of two power sources. For example, the typical secondary battery can be recharged by one battery charger adapted to receive energy from an electrical wall outlet. In addition, the typical secondary battery can be recharged by another battery charger adapted to receive electrical energy from a cigarette lighter outlet of an automobile. There are many situations in which neither of the power sources is available. For example, an explorer who is out in the field for days or weeks at a time may endanger himself when his wireless communication device becomes inoperable due to a depleted battery. Similarly, a news crew member can lose valuable opportunities when its camcorder runs out of battery during an important news coverage at a place where no power source is available. Accordingly, there is a need for a portable battery recharge station that can recharge secondary batteries with a portable power source.
There are a number of battery chargers known in the art. For example, U.S. Pat. No. 5,343,136 (the “Yamaguchi patent”) discloses a charger having a chargeable battery with a larger current capacity than a target chargeable battery of a cordless telephone. The charger disclosed can only be used to recharge its associated target chargeable battery.
U.S. Pat. No. 5,396,162 (the “Brilmyer patent”) discloses a portable battery charger that utilizes an assembly of primary battery cells to recharge the rechargeable battery of a battery appliance. The portable battery charger disclosed is limited to using primary battery cells as its portable power source.
U.S. Pat. No. 5,565,756 (the “Urbish patent”) discloses a microprocessor controlled portable battery charger for use with a variety of battery packs. The charger disclosed can use either primary or secondary batteries as its portable power source. The charger requires charging, sensing, identifying, and output means to properly recharge the battery packs.
U.S. Pat. No. 6,154,007 (the “Shaver patent”) discloses a battery charging system that enables rapid recharging of a working battery without the need for current limit and/or over-voltage protection. The portable battery charging system disclosed, however, must always have a greater number of cells than the number of cells in the working battery.
Various technologies related to rechargeable batteries are further disclosed in other U.S. Patents. For example, U.S. Pat. Nos. 5,747,968 and 5,773,959 (the “Merritt patents”) disclose lithium polymer battery charging methods and apparatus. U.S. Pat. No. 5,645,960 (the “Scrosati patent”) discloses a thin film lithium polymer battery. U.S. Pat. Nos. 6,091,230 and 6,166,548 (the “Winzer patents”) discloses a voltage recovery method for a zinc-air battery and a method of detecting battery capacity of a zinc-air battery, respectively. U.S. Pat. No. 6,146,781 (the “Surampudi patent”) discloses a direct methanol feed fuel cell and system. U.S. Pat. No. 5,352,967 (the “Karl-Diether patent”) discloses a charging method for NiCd and NiH cells. U.S. Pat. No. 6,043,631 (the “Tsenter patent”) discloses a method for charging NiCd, NiH
2
and NiMH batteries.
Each of the above-referenced U.S. patents is incorporated herein by reference in its entirety.
SUMMARY OF THE INVENTION
The present invention is a system and method for recharging secondary batteries. One embodiment of the present invention is a portable battery recharge station. The recharge station comprises means for determining a voltage requirements of a secondary battery, a voltage converter, a power source, and means for receiving the secondary battery.
In this embodiment, when a secondary battery is in communication with the receiving means, the determining means communicates with the voltage converter to supply an appropriate voltage required to recharge the secondary battery. The voltage converter receives electrical power from the power source. The voltage converter can convert the voltage of the power source up (i.e., increasing the voltage) or down (i.e., decreasing the voltage) as appropriate to recharge the secondary battery as instructed by the determining means.
The power source of the portable battery recharge station can be one of several types of power sources. For example, the portable power source can be replaceable, rechargeable, or renewable. Replaceable power source can comprise a primary battery. Examples of primary batteries are alkaline and zinc-air batteries. When a primary battery is depleted, it is removed from the portable battery recharge station and replaced by a fresh or new primary battery. Additionally, the power source can be an electrical outlet or a vehicular battery.
A rechargeable power source can comprise a secondary battery. Examples of secondary batteries include NiCd, NiH
2
, NiMH, Li-ion, Li-polymer, and zinc-air batteries. A depleted secondary battery can be recharged by an external power source through a recharger of the portable battery recharge station.
A renewable power source can comprise a renewable battery. Examples of renewable batteries include a methanol fuel cell and other fuel cell whose electrolyte can be replenished or otherwise replaced. When a renewable battery is depleted, an appropriate fuel can be added or old electrolyte can be renewed to supply energy to the portable power source. For example, zinc electrolyte cells can be renewed by replacing the electrolyte in the cell.
Preferably, the portable battery recharge station has more than one receiving means. The receiving means can be, for example, one or more holders. Each receiving means can be adapted to receive a specific type of secondary battery. For example, a first receiving means can be adapted to receive a Ni-Cd battery, a second receiving means can be adapted to receive a NiMH battery, a third receiving means can be adapted to receive a Li-ion battery, a fourth receiving means can be adapted to receiv
Frerking Melvin D.
Parker John Keith
Watts Alonzo L.
BellSouth Intellectual Property Corporation
Luk Lawrence
Shaw Pittman LLP
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