Method and device for determining state of health of the battery, and battery power supply system
First Claim
1. A method for determining state of health of a battery comprising the steps of:
- causing the battery to discharge square wave pulses with a prescribed cycle at a prescribed current value;
sampling response voltages at a time of a pulse-discharge;
expanding sampled response voltages into orthogonal square wave components;
dividing an amplitude of the square wave component by the current value of the pulse-discharge to obtain a pseudo-impedance; and
determining state of health of the battery based on the pseudo-impedance.
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Abstract
A method and the device are provided for determining state of health of the battery, in addition to the power supply system using the device, to reduce operational and processing load by expanding the data sampled at the time when the battery is caused to discharge square wave pulses into the square wave is provided. The method includes determining state of health of a battery by causing the battery to discharge square wave pulses with a prescribed cycle at a prescribed current value. Response voltages are sampled at a time of a pulse-discharge. The sampled response voltages are sampled into orthogonal square wave components. An amplitude of the square wave component is divided by the current value of the pulse-discharge to obtain a pseudo-impedance. A state of health of the battery based on the pseudo-impedance is determined.
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Citations
14 Claims
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1. A method for determining state of health of a battery comprising the steps of:
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causing the battery to discharge square wave pulses with a prescribed cycle at a prescribed current value; sampling response voltages at a time of a pulse-discharge; expanding sampled response voltages into orthogonal square wave components; dividing an amplitude of the square wave component by the current value of the pulse-discharge to obtain a pseudo-impedance; and determining state of health of the battery based on the pseudo-impedance. - View Dependent Claims (3, 4, 12, 13)
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2. A method for determining state of health of a battery comprising the steps of:
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causing the battery to discharge arbitrary waveform pulses; sampling respective current waveform and response voltage waveform at a time of pulse-discharge; expanding sampled current waveform and response voltage waveform into at least one orthogonal square wave component; dividing an amplitude of the square wave component of the response voltage waveform by an amplitude of the square wave component of the current waveform to obtain a pseudo-impedance; and determining state of health of the battery based on the pseudo-impedance. - View Dependent Claims (5)
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6. A device for determining state of health of a battery including a discharge circuit to cause the battery to discharge pulses with prescribed cycles at prescribed current values;
a memory to store sampled response voltages at a time of pulse-discharge; and
a CPU inputting the response voltages from the memory, expanding the response voltages into orthogonal square wave components, dividing an amplitude of the square wave component of the response voltages by the current values of the pulse-discharge to obtain a pseudo-impedance, and determining state of health of the battery based on the pseudo-impedance.- View Dependent Claims (8, 9, 14)
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7. A device for determining state of health of a battery including a discharge circuit to cause the battery to discharge arbitrary waveform pulses;
- a memory to store a sampled current waveform and response voltage waveform at a time of pulse-discharge; and
a CPU inputting the current waveform and the response voltage waveform from the memory, expanding the current waveform and the response voltage waveform into at least one orthogonal square wave component, dividing an amplitude of the square wave component of the response voltage waveform by an amplitude of the square wave component of the current waveform to obtain a pseudo-impedance, and determining state of health of the battery based on the pseudo-impedance. - View Dependent Claims (10, 11)
- a memory to store a sampled current waveform and response voltage waveform at a time of pulse-discharge; and
Specification