Battery-state monitoring system
First Claim
1. A battery-state monitoring system which monitors a state of each of a plurality of storage batteries in an equipment provided with an assembled battery composed of the storage batteries connected in series and a power generation facility utilizing natural energy, the system comprising:
- a current detecting unit which detects a current in each of the storage batteries;
a state measuring unit which measures a temperature, a voltage, and internal resistance of each of the storage batteries, the internal resistance being measured by using at least two or more kinds of frequencies including at least a first frequency of lower than 200 Hz and a second frequency of 200 Hz or higher to lower than 2000 Hz;
a prime monitoring unit which acquires measurement data from the state measuring unit corresponding to each of the storage batteries and issues an instruction related to an operation to the current detecting unit and the state measuring unit,wherein the prime monitoring unit estimates degradation of each of the storage batteries based on at least one or more values of the temperature, the voltage, and the internal resistance measured by the state measuring unit and a DC resistance of each of the storage batteries obtained from a ratio between a change in a current value detected by the current detecting unit and a change in a voltage value measured by the state measuring unit during discharging and charging of each of the storage batteries, anda control unit which controls discharging from the storage battery to a load and charging to the storage battery with surplus power from the power generation facility,wherein the prime monitoring unit instructs the control unit to connect the storage battery to a discharge circuit to the load when a measurement value of the voltage of the storage battery acquired from the state measuring unit is equal to or higher than a predetermined overdischarge preventive voltage, and instructs the control unit to disconnect the storage battery from the discharge circuit when the measurement value of the voltage is lower than the overdischarge preventive voltage, andthe prime monitoring unit instructs the control unit to connect the storage battery to a charge circuit from the power generation facility when the measurement value of the voltage is equal to or lower than a predetermined overcharge preventive voltage and when the measurement value of the voltage is higher than the overcharge preventive voltage and a charge current value to the storage battery detected by the current detecting unit is equal to or larger than a predetermined value, and instructs the state measuring unit to acquire a value of internal resistance of the storage battery and also instructs the control unit to disconnect the storage battery from the charge circuit when the measurement value of the voltage is higher than the overcharge preventive voltage and the charge current value to the storage battery detected by the current detecting unit is smaller than a predetermined value.
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Accused Products
Abstract
A battery-state monitoring system capable of precisely and efficiently estimating the state and service life of a plurality of storage batteries charged with power generated by utilizing natural energy and constantly connected to an equipment is provided. The system includes a power supply control device that detects a current in each battery, an end device that measures temperature, voltage, and internal resistance of each battery, the internal resistance being measured by using two or more kinds of frequencies, and a prime monitoring device that acquires measurement data from the end device corresponding to each battery and issues an instruction related to an operation to the power supply control device and the end device. The prime monitoring device estimates degradation of each battery based on at least one of temperature, voltage, and internal resistance.
33 Citations
9 Claims
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1. A battery-state monitoring system which monitors a state of each of a plurality of storage batteries in an equipment provided with an assembled battery composed of the storage batteries connected in series and a power generation facility utilizing natural energy, the system comprising:
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a current detecting unit which detects a current in each of the storage batteries; a state measuring unit which measures a temperature, a voltage, and internal resistance of each of the storage batteries, the internal resistance being measured by using at least two or more kinds of frequencies including at least a first frequency of lower than 200 Hz and a second frequency of 200 Hz or higher to lower than 2000 Hz; a prime monitoring unit which acquires measurement data from the state measuring unit corresponding to each of the storage batteries and issues an instruction related to an operation to the current detecting unit and the state measuring unit, wherein the prime monitoring unit estimates degradation of each of the storage batteries based on at least one or more values of the temperature, the voltage, and the internal resistance measured by the state measuring unit and a DC resistance of each of the storage batteries obtained from a ratio between a change in a current value detected by the current detecting unit and a change in a voltage value measured by the state measuring unit during discharging and charging of each of the storage batteries, and a control unit which controls discharging from the storage battery to a load and charging to the storage battery with surplus power from the power generation facility, wherein the prime monitoring unit instructs the control unit to connect the storage battery to a discharge circuit to the load when a measurement value of the voltage of the storage battery acquired from the state measuring unit is equal to or higher than a predetermined overdischarge preventive voltage, and instructs the control unit to disconnect the storage battery from the discharge circuit when the measurement value of the voltage is lower than the overdischarge preventive voltage, and the prime monitoring unit instructs the control unit to connect the storage battery to a charge circuit from the power generation facility when the measurement value of the voltage is equal to or lower than a predetermined overcharge preventive voltage and when the measurement value of the voltage is higher than the overcharge preventive voltage and a charge current value to the storage battery detected by the current detecting unit is equal to or larger than a predetermined value, and instructs the state measuring unit to acquire a value of internal resistance of the storage battery and also instructs the control unit to disconnect the storage battery from the charge circuit when the measurement value of the voltage is higher than the overcharge preventive voltage and the charge current value to the storage battery detected by the current detecting unit is smaller than a predetermined value. - View Dependent Claims (2, 3, 4)
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5. A battery-state monitoring system which monitors a state of each of a plurality of storage batteries in an equipment provided with an assembled battery composed of the storage batteries connected in series and a power generation facility utilizing natural energy, the system comprising:
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a current detecting unit which detects a current in each of the storage batteries; a state measuring unit which measures a temperature, a voltage, and internal resistance of each of the storage batteries, the internal resistance being measured by using at least two or more kinds of frequencies including at least a first frequency of lower than 200 Hz and a second frequency of 200 Hz or higher to lower than 2000 Hz; a prime monitoring unit which acquires measurement data from the state measuring unit corresponding to each of the storage batteries and issues an instruction related to an operation to the current detecting unit and the state measuring unit, wherein the prime monitoring unit estimates degradation of each of the storage batteries based on at least one or more values of the temperature, the voltage, and the internal resistance measured by the state measuring unit and a DC resistance of each of the storage batteries obtained from a ratio between a change in a current value detected by the current detecting unit and a change in a voltage value measured by the state measuring unit during discharging and charging of each of the storage batteries; an end device composed of the state measuring unit; a prime monitoring device composed of the prime monitoring unit; and a station device which relays a communication between the prime monitoring device and the end device, wherein one or more station devices are connected to the prime monitoring device so as to enable communication therebetween, and one or more end devices are connected to each of the station devices so as to enable communication therebetween. - View Dependent Claims (6, 7, 8, 9)
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Specification