SYSTEMS AND METHODS FOR DETERMINING A REMAINING BATTERY CAPACITY OF A BATTERY DEVICE
First Claim
1. A system for determining a remaining battery capacity of a battery device, wherein the battery device includes an internal resistor, comprising:
- a detection circuitry, coupled to the battery device for detecting an open circuit voltage and a closed circuit voltage of the battery device; and
a controller, coupled to the detection circuitry,wherein the controller calculates an amount of current drawn out from the battery device based on values of the open circuit voltage and the closed circuit voltage and a resistance of the internal resistor;
calculates a present depth of discharge based on the amount of current; and
determines the remaining battery capacity of the battery device according to the present depth of discharge.
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Abstract
A system for determining a remaining battery capacity includes a detection circuitry and a controller. The detection circuitry is coupled to a battery device for detecting an open circuit and a closed circuit voltage of the battery device. The controller is coupled to the detection circuitry, calculates an amount of current drawn out from the battery device based on values of the open circuit voltage and the closed circuit voltage and a resistance of the internal resistor, calculates a present depth of discharge based on the amount of current, and determines the remaining battery capacity of the battery device according to the present depth of discharge.
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Citations
18 Claims
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1. A system for determining a remaining battery capacity of a battery device, wherein the battery device includes an internal resistor, comprising:
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a detection circuitry, coupled to the battery device for detecting an open circuit voltage and a closed circuit voltage of the battery device; and a controller, coupled to the detection circuitry, wherein the controller calculates an amount of current drawn out from the battery device based on values of the open circuit voltage and the closed circuit voltage and a resistance of the internal resistor; calculates a present depth of discharge based on the amount of current; and determines the remaining battery capacity of the battery device according to the present depth of discharge. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for determining a remaining battery capacity of a battery device, comprising:
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(a) obtaining an open circuit voltage of the battery device; (b) deriving a resistance of an internal resistor comprised in the battery device; (c) detecting a closed circuit voltage of the battery device; (d) calculating an amount of current drawn out from the battery device based on a value of the open circuit voltage, a value of the closed circuit voltage and the resistance of the internal resistor; (e) calculating a present depth of discharge based on the amount of current; and (f) determining the remaining battery capacity of the battery device according to the present depth of discharge. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification