Electricity: battery or capacitor charging or discharging – Battery or cell discharging – With charging
Reexamination Certificate
2000-08-07
2001-07-10
Wong, Peter S. (Department: 2838)
Electricity: battery or capacitor charging or discharging
Battery or cell discharging
With charging
C320S134000
Reexamination Certificate
active
06259230
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to an apparatus for charging and discharging a battery device, more particularly to an apparatus for charging and discharging a battery device that can control accurately charging and discharging currents.
2. Description of the Related Art
Lithium batteries are known dc power supplying devices. In the manufacturing process of lithium batteries, it is necessary to repeatedly perform charging and discharging tests for the lithium batteries. Because charging and discharging are conventionally performed using separate circuits, the need to switch between the two circuits during testing results inconvenience and higher costs. In addition, a conventional discharge circuit generally includes a resistor or an electrical load to draw the power from a battery. The electronic load is a power device, such as a BJT or a MOSFET, which has a saturation voltage acting thereon when working in the saturation region. Since the power device is turned off when the battery is discharged to the saturation voltage of the power device, the battery thus cannot be fully discharged by means of the conventional discharge circuit, thereby resulting in an impact on the service life of the battery.
SUMMARY OF THE INVENTION
Therefore, the object of the present invention is to provide an apparatus for charging and discharging a battery device that can control accurately charging and discharging currents and that can enable a battery device to fully discharge.
According to the present invention, an apparatus is adapted for charging and discharging a battery device having positive and negative terminals. The apparatus includes a power supplying unit, a current control unit and a control device.
The power supplying unit is operable so as to provide a direct current voltage output.
The current control unit is coupled to the power supplying unit so as to receive the direct current voltage output therefrom.
The control device is coupled to the current control unit, and is adapted to be coupled to the battery device. The control device enables the current control unit when a battery voltage of the battery device is below a predetermined voltage value, and disables the current control unit when the battery voltage is at least equal to the predetermined voltage value.
The current control unit is adapted to be coupled to the battery device in a charging state, where the positive terminal of the battery device is coupled to the current control unit so as to permit charging of the battery device when the current control unit is enabled by the control device.
The current control unit is further adapted to be coupled to the battery device in a discharging state, where the negative terminal of the battery device is coupled to the current control unit so as to permit discharging of the battery device when the current control unit is enabled by the control device.
REFERENCES:
patent: 5637980 (1997-06-01), Wu
Chroma Ate Inc.
Ladas & Parry
Toatley Jr. Gregory J
Wong Peter S.
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