Methods and apparatus for estimating a state of health of a battery
First Claim
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1. An apparatus for estimating a state of health of a battery, comprising:
- a voltage sensor responsive to an output voltage of the battery;
a current sensor responsive to a current of the battery;
a secondary current circuit coupled to the current sensor and comprising;
a first transistor and a second transistor coupled in parallel; and
a voltage source circuit to selectively operate the first and second transistors by applying a predetermined constant voltage to each of the first and second transistors; and
a logic unit responsive to the voltage sensor and the current sensor, wherein the logic unit is configured to;
determine a baseline internal resistance of the battery;
calculate an aged internal resistance of the battery based on the current and the output voltage; and
estimate the state of health of the battery based on the baseline internal resistance and the aged internal resistance.
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Abstract
Various embodiments of the present technology may comprise a method and apparatus to estimate the state of health of a battery. The method and apparatus may comprise utilizing various parameters, such as RSOC, resistance, and voltage, to estimate the state of health of the battery. In various embodiments, the state of health of the battery may indicate the remaining life of the battery.
10 Citations
16 Claims
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1. An apparatus for estimating a state of health of a battery, comprising:
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a voltage sensor responsive to an output voltage of the battery; a current sensor responsive to a current of the battery; a secondary current circuit coupled to the current sensor and comprising; a first transistor and a second transistor coupled in parallel; and a voltage source circuit to selectively operate the first and second transistors by applying a predetermined constant voltage to each of the first and second transistors; and a logic unit responsive to the voltage sensor and the current sensor, wherein the logic unit is configured to; determine a baseline internal resistance of the battery; calculate an aged internal resistance of the battery based on the current and the output voltage; and estimate the state of health of the battery based on the baseline internal resistance and the aged internal resistance. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for determining a state of health of a battery comprising:
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measuring an output voltage of the battery; measuring a current of the battery; calculating an aged internal resistance of the battery based on the current and the output voltage; applying a secondary current to the battery, wherein applying the secondary current comprises applying a voltage to at least one of a first transistor and a second transistor coupled in parallel and maintaining the current through the first transistor and the second transistor at a constant level; and estimating the state of health of the battery based on the aged internal resistance. - View Dependent Claims (8, 9, 10, 11)
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12. A system for indicating a state of health of a battery, comprising:
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a voltage sensor responsive to an output voltage of the battery; a memory device storing; predetermined first battery characteristic data indicating a relationship between the voltage and a relative state of charge of the battery; predetermined second battery characteristic data indicating a relationship between a baseline internal resistance and a relative state of charge of the battery; a current sensor responsive to a current of the battery; a secondary current circuit coupled to the current sensor to effect a change in the output voltage; and
comprising a first transistor and a second transistor coupled in parallel with each other; anda logic unit responsive to the voltage sensor, the temperature sensor, and the current sensor and having access to the memory device, wherein the logic unit is configured to; determine the relative state of charge of the battery; determine the baseline internal resistance of the battery according to the relative state of charge and the second battery characteristic data; calculate an aged internal resistance of the battery based on the current and the output voltage; and estimate the state of health of the battery based on the baseline internal resistance and the aged internal resistance; and a display unit coupled to the logic unit to display the state of health of the battery, wherein the display unit displays at least one of;
a general indicator and a specific indicator related to the state of health of the battery. - View Dependent Claims (13, 14, 15, 16)
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Specification