METHOD FOR DETERMINING DETERIORATION OF ACCUMULATOR BATTERY, METHOD FOR MEASURING INTERNAL IMPEDANCE OF SECONDARY BATTERY, EQUIPMENT FOR MEASURING INTERNAL IMPEDANCE OF SECONDARY BATTERY, EQUIPMENT FOR DETERMINING DETERIORATION OF SECONDARY BATTERY, AND POWER SUPPLY SYSTEM
First Claim
1. A method for determining deterioration of accumulator battery hooked up with loads in a system based on results of measuring internal resistances of an accumulator battery, the method comprising the steps of:
- predetermining as a specified temperature a temperature at which the deterioration of the accumulator battery is determined;
calculating in advance temperature correction coefficients of the internal resistances from changes of the internal resistances depending on temperatures;
predetermining resistance-voltage conversion factors to convert between the internal resistances at the specified temperature and terminal discharge voltages of the accumulator battery which are obtained at the specified temperature under a condition of flowing predetermined discharge currents from the accumulator battery;
measuring the internal resistances of the accumulator battery and temperature of the accumulator battery at an internal resistance measurement;
converting the measured internal resistance values into the internal resistance values at the specified temperature with use of the temperature correction coefficients of the internal resistances;
converting the internal resistance values at the specified temperature into the terminal discharge voltage values of the accumulator battery at the specified temperature with use of the resistance-voltage conversion factors; and
determining whether the accumulator battery is deteriorated or not by means of comparison of the terminal discharge voltage values of the accumulator battery at the specified temperature and a predetermined threshold value as a deterioration judgment standard.
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Abstract
A method for determining the deterioration of an accumulator battery, hooked up with loads in a system, based on the result of measuring internal resistances of an accumulator battery, the method including predetermining a temperature at which the deterioration of the accumulator battery is determined, calculating temperature correction coefficients, predetermining resistance-voltage conversion factors, measuring the internal resistances and temperature of the accumulator battery, converting the measured internal resistance values into the internal resistance values, converting the internal resistance values at the specified temperature into the terminal discharge voltage values and determining whether the accumulator battery is deteriorated or not by means of comparison of the terminal discharge voltage values.
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Citations
21 Claims
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1. A method for determining deterioration of accumulator battery hooked up with loads in a system based on results of measuring internal resistances of an accumulator battery, the method comprising the steps of:
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predetermining as a specified temperature a temperature at which the deterioration of the accumulator battery is determined;
calculating in advance temperature correction coefficients of the internal resistances from changes of the internal resistances depending on temperatures;
predetermining resistance-voltage conversion factors to convert between the internal resistances at the specified temperature and terminal discharge voltages of the accumulator battery which are obtained at the specified temperature under a condition of flowing predetermined discharge currents from the accumulator battery;
measuring the internal resistances of the accumulator battery and temperature of the accumulator battery at an internal resistance measurement;
converting the measured internal resistance values into the internal resistance values at the specified temperature with use of the temperature correction coefficients of the internal resistances;
converting the internal resistance values at the specified temperature into the terminal discharge voltage values of the accumulator battery at the specified temperature with use of the resistance-voltage conversion factors; and
determining whether the accumulator battery is deteriorated or not by means of comparison of the terminal discharge voltage values of the accumulator battery at the specified temperature and a predetermined threshold value as a deterioration judgment standard. - View Dependent Claims (4, 5, 6, 9, 10, 11, 12)
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2. A method for determining deterioration of accumulator battery hooked up with loads in a system based on results of measuring internal resistances of the accumulator battery, the method comprising the steps of:
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predetermining as a specified temperature a temperature at which the deterioration of the accumulator battery is determined;
calculating in advance temperature correction coefficients of the internal resistances from changes of the internal resistances depending on temperatures;
predetermining resistance-voltage conversion factors to convert between the internal resistances at the specified temperature and discharge drop voltages of the accumulator battery which are obtained at the specified temperature under condition of flowing predetermined discharge currents from the accumulator battery;
measuring internal resistances of the accumulator battery and a temperature of the accumulator battery at an internal resistance measurement;
converting measured internal resistance values into the internal resistance values at the specified temperature with use of the temperature correction coefficients of the internal resistances;
converting the internal resistance values at the specified temperature into the discharge drop voltage values of the accumulator battery at the specified temperature with use of the resistance-voltage conversion factors; and
determining whether the accumulator battery is deteriorated or not by means of comparison of the discharge drop voltage values of the accumulator battery at the specified temperature and a predetermined threshold value as a deterioration judgment standard. - View Dependent Claims (7)
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3. A method for determining deterioration of accumulator battery hooked up with loads in a system based on results of measuring internal resistances of the accumulator battery, the method comprising the steps of:
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predetermining as a specified temperature a temperature at which the deterioration of the accumulator battery is determined;
calculating in advance temperature correction coefficients of the internal resistances from changes of the internal resistances depending on temperatures;
predetermining resistance-voltage conversion factors to convert between the internal resistances at the specified temperature and discharge drop voltages of the accumulator battery which are obtained at the specified temperature under condition of flowing predetermined discharge currents from the accumulator battery;
measuring internal resistances of the accumulator battery and temperature of the accumulator battery at an internal resistance measurement;
converting the measured internal resistance values into the internal resistance values at the specified temperature with use of the temperature correction coefficients of the internal resistances; and
determining whether the accumulator battery is deteriorated or not by means of comparison of the internal resistance values at the specified temperature and predetermined threshold value as a deterioration judgment standard. - View Dependent Claims (8)
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13. A method for determining deterioration of accumulator battery hooked up with loads in the system based on discharge performance of the accumulator battery, the method comprising the steps of:
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picking up plural specified temperatures depending on the measured temperature in determination deterioration of the accumulator battery;
presetting the selected specified temperatures as a specified temperature at which deterioration of the accumulator battery is determined;
measuring correlation values correlative with the discharge performance at a desired temperature;
converting the correlation values into correlation values at the specified temperature based upon the temperature correcting formula obtained in advance, the desired temperature in the measurement of the correlation values and the correlation values;
calculating the discharge performance from the converted correlation values by means of a relational formula between correlation values and the discharge performance; and
determining the deterioration of the accumulator battery by means of comparison between the calculated discharge performance values respectively at the plural specified temperatures or judgment of correlation between the calculated discharge performance values. - View Dependent Claims (14, 15, 16, 17, 18)
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19. An equipment for determining deterioration of accumulator battery hooked up with loads in a system based upon results of measuring internal resistances of the accumulator battery,
which predetermines a specified temperature as a temperature at which the deterioration of the accumulator battery is determined, calculates in advance temperature correction coefficients of the internal resistances from changes of the internal resistances depending on temperatures, predetermines resistance-voltage conversion factors to convert between the internal resistances at the specified temperature and the terminal discharge voltages of the accumulator battery which are obtained at the specified temperature under the condition of flowing predetermined discharge currents from the accumulator battery; - the equipment including;
a battery temperature measuring part which measures internal resistances of the accumulator battery and temperature of the accumulator battery at the internal resistance measurement;
an internal resistance converting part which converts the measured internal resistance values into the internal resistance values at the specified temperature with use of the temperature correction coefficients of the internal resistances;
a terminal voltage converting part which converts the internal resistance values at the specified temperature into the terminal discharge voltage values of the accumulator battery at the specified temperature with use of the resistance-voltage conversion factors; and
a deterioration determining part which determines whether the accumulator battery is deteriorated or not by means of comparison of the terminal discharge voltage values of the accumulator battery at the specified temperature and predetermined threshold value as a deterioration judgment standard. - View Dependent Claims (20, 21)
- the equipment including;
Specification