JP5499200B2 - Degradation determination apparatus, deterioration determination method, and program - Google Patents

Description

The present invention relates to a power supply system provided with a secondary battery as a backup, and relates to a deterioration determination device, a deterioration determination method, and a program having a secondary battery deterioration diagnosis function.
This application claims priority based on Japanese Patent Application No. 2005-238741 for which it applied to Japan on August 19, 2005, and uses the content here.

2. Description of the Related Art Conventionally, in a DC power supply system that directly supplies power to communication equipment such as telephone exchange, a backup storage battery is maintained by a floating charging method. In this system, the load facility and the storage battery are connected in parallel to the output side of the rectifier, so that the rectifier always supplies DC power to the load and the battery is fully charged according to the state of charge of the storage battery. Necessary charging current is supplied. In this system, when a power failure or rectifier failure occurs, the storage battery is discharged at that moment, and the power supply to the load facility is not interrupted even for a moment.
In such systems that require reliability, storage batteries are used, so by grasping the remaining capacity of the storage battery, it is determined whether the performance of the storage battery can be fully demonstrated, and the state of the system is grasped. It is desirable to keep it.

  Against this background, several methods for grasping and monitoring the status of backup storage batteries have been studied. One of these is to check the normality of power supply from the battery while the power supply system is supplying power. In this method, the output voltage of the rectifier is reduced for a predetermined time to discharge the storage battery, and the voltage characteristics at that time are determined (see Non-Patent Document 1).

KOZUKA, et al. “Development of On-line Battery Testing Technology”, Proceeding of INTELE '97, 18-2, p.397.

However, the method of discharging the storage battery by reducing the output voltage of the rectifier for a predetermined time in the above-described prior art is intended to confirm the normality of the charge / discharge circuit of the storage battery. Therefore, there is a problem that the remaining capacity of the storage battery cannot be grasped.
Here, even if an attempt is made to “estimate the remaining capacity of the storage battery”, since the discharge capacity is directly discharged to an actual load that constantly changes, there is a guarantee that the discharge current value is always constant. No. For this reason, it is difficult to measure the discharge voltage characteristic without being affected by the change in the current value of the current flowing through the load according to the change in the capacity of the load, and the measured discharge voltage characteristic is a constant current discharge characteristic. Unlikely, capacity estimation could not be performed.

  This invention is made | formed in view of such a situation, and provides the deterioration determination apparatus, the deterioration determination method, and program which can estimate the capacity | capacitance of a storage battery.

In order to solve the above-described problem, the present invention is a deterioration determination device that determines a deterioration state of a battery to be measured, and a load and a battery to be measured are connected in parallel to an output terminal provided and supplied. A rectifier capable of outputting an output voltage according to a set value to the output terminal, a pseudo load device connected in parallel to the output terminal of the rectifier separately from the load, the pseudo load device and the load from the battery And a current measuring unit for measuring a current value of a discharge current of the battery flowing through the control circuit, and controlling a set value of the output voltage to discharge the output voltage of the rectifier from the battery during the battery deterioration determination test. A rectifier voltage control unit for making a voltage to be performed, and a current value of a discharge current that is discharged to the pseudo load device and the load when the deterioration determination test is performed before the deterioration determination test is performed before the deterioration determination test is performed. And a control unit for controlling the current flowing in the dummy load device such that the predetermined current value exceeding the current value before deterioration determination test determined according to the current flowing in the serial load, characterized in that it comprises a.
Thereby, the deterioration determination device that determines the deterioration state of the battery to be measured decreases the output voltage from the rectifier that supplies power to the load, and the rectifier and the battery in which the battery to be measured is connected in parallel to the output side, Measure the current value flowing from the load connected in parallel to the output of the rectifier and the pseudo load device connected in parallel to the output of the rectifier separately from the load, and the pseudo load so that the measurement result becomes a predetermined current value Control the load on the device.

Further, the present invention is the above-described degradation determination apparatus, wherein the current measurement unit includes a load current measurement unit that measures a current value of a current flowing through the load, and a discharge current measurement that measures a current value of the discharge current of the battery. And the control unit is based on the current value before the deterioration determination test determined from the current value of the current flowing through the load measured by the load current measuring unit, the measured deterioration determination test A discharge current value of the discharge current of the battery having the predetermined current value that exceeds the previous current value is determined, and a current value of the discharge current that flows through the pseudo load device and the load when the deterioration determination test is performed is the discharge current. The current flowing through the pseudo load device is controlled so as to be a value.
Still further, the present invention provides the above-described deterioration determination apparatus, wherein a discharge current of the discharge current value is allowed to flow from the battery to the pseudo load device and the load, and the discharge time of the discharge current value of the discharge current value is A calculation unit is provided that calculates a remaining capacity of the battery based on a voltage between terminals of the battery corresponding to the discharge current in a discharge time. Thereby, the deterioration determination device refers to the battery data indicating the relationship between the discharge time at the predetermined current value of the battery to be measured, the voltage between the terminals, and the remaining capacity, and discharges the pseudo load device and the load. The remaining capacity of the battery is calculated based on the discharge time in the current and the voltage between the terminals of the battery corresponding to the discharge current in the discharge time.

  Further, the present invention provides the above-described deterioration determination apparatus, wherein the output voltage of the rectifier is controlled at the lower limit of the voltage range allowed by the load by controlling the set value of the output voltage and performing the battery deterioration determination test. It is characterized in that the voltage is higher than the voltage and lower than the voltage set before the deterioration determination test is carried out, so that the battery is discharged.

  According to the present invention, in the above-described deterioration determination device, the rectifier voltage control unit supplies power from the battery to the load and the pseudo load device when the deterioration determination test is performed. The control state in which the control is performed so as to decrease the voltage of the rectifier when the voltage drops below a predetermined threshold voltage is released.

  In addition, the present invention is a deterioration determination method for determining a deterioration state of a battery to be measured, the deterioration determination method for determining a deterioration state of a battery to be measured, wherein a load and a battery to be measured are connected to a rectifier. Enabling the output voltage corresponding to the set value supplied from the rectifier connected in parallel to the output terminal to be output to the output terminal; and the pseudo load device in parallel to the output terminal of the rectifier separately from the load A step of measuring a current value of a discharge current of the battery flowing from the battery to the pseudo load device and the load, and a rectifier voltage control unit controlling a set value of the output voltage The output voltage of the rectifier at the time of the battery deterioration determination test is set to a voltage for discharging the battery, and the battery is discharged before the deterioration determination test is performed. The current value of the discharge current flowing through the pseudo load device and the load is a predetermined current value that exceeds the current value before the deterioration determination test determined according to the current flowing through the load before the deterioration determination test is performed. And a step of controlling a current flowing through the pseudo load device.

  Further, the present invention provides a set value supplied from a rectifier in which a load and a battery to be measured are connected in parallel to an output terminal of a rectifier to a computer of a deterioration determination device that determines a deterioration state of the battery to be measured. An output voltage corresponding to the output terminal, enabling the output terminal of the rectifier to connect a pseudo load device in parallel to the load separately from the load; from the battery to the pseudo load device and the load; A step of measuring a current value of a discharge current of the battery to be passed through, a rectifier voltage control unit controlling a set value of the output voltage, and an output voltage of the rectifier during the battery deterioration determination test A voltage for causing the battery to discharge, and a current value of a discharge current that flows through the pseudo load device and the load by discharging the battery when the deterioration determination test is performed. Performing a step of controlling a current flowing through the pseudo load device so that a predetermined current value exceeds a pre-degradation test current value determined according to a current flowing through the load before the deterioration determination test is performed. It is a program to make it.

  In addition to the above, the present invention may have features exemplified below in order to solve the above-described problems. An example is a deterioration determination device that determines a deterioration state of a measurement target battery, and a rectifier voltage control unit that lowers an output voltage from a rectifier that supplies power to a load, and the measurement target battery connected in parallel to the output side Rectifier, a load connected in parallel to the output of the rectifier, a pseudo load device connected in parallel to the output of the rectifier in parallel with the load, and the load and the pseudo from the rectifier and the battery. A load current measuring unit that measures a current value flowing to the load device, a control unit that controls a load of the pseudo load device so that a measurement result of the load current measuring unit becomes a predetermined current value, and a measurement target A battery data storage unit for storing battery data indicating a relationship between a discharge time at a predetermined current value of the battery, a voltage between terminals of the battery and a remaining capacity, and the battery data stored in the battery data storage unit. The remaining capacity of the battery is calculated based on a discharge time in a discharge current discharged to the pseudo load device and the load and a voltage between terminals of the battery corresponding to the discharge current in the discharge time. And an arithmetic unit for performing the processing.

Further, as an example, in the above-described deterioration determination device, the battery data storage unit is maintained by charging before discharging and the voltage between terminals of the battery at an arbitrary discharge current and an arbitrary discharge elapsed time at the time of discharging. Battery data indicating the relationship between the difference in voltage between the terminals of the battery and the remaining battery capacity is stored.
Further, as an example, in the above-described deterioration determination apparatus, the battery data storage unit includes an arbitrary discharge current, an arbitrary discharge time, a voltage between battery terminals in a charge state of a reference battery, and a battery terminal during discharge. Battery data indicating the relationship between the voltage difference and the remaining battery capacity is stored.
Furthermore, the present invention is characterized in that, in the above-described deterioration determination apparatus, the battery data storage unit stores battery data indicating a relationship between a battery terminal voltage and a discharge elapsed time for each remaining capacity. .
Also, as an example, in the above-described deterioration determination apparatus, the battery data storage unit includes at least one of a manufacturer, a delivery company, a manufacturing lot, a battery model, a battery temperature, a discharge current value, and a discharge elapsed time. Battery data is stored for each discharge condition.

  Further, as an example, in the above-described deterioration determination device, when the rectifier voltage control unit supplies power from the battery to the load and the pseudo load device, the voltage of the battery decreases to a predetermined value or less. In this case, the voltage drop of the rectifier is canceled.

  Further, an example is a deterioration determination method for determining a deterioration state of a measurement target battery, in which an output voltage from a rectifier supplying power to a load is reduced, and the measurement target battery is connected in parallel to an output side. A current value flowing from a rectifier and the battery to a load connected in parallel to the output of the rectifier and a pseudo load device connected in parallel to the output of the rectifier separately from the load is measured, and the measurement result is predetermined. The load of the pseudo load device is controlled so that the current value becomes the current value, and the battery data indicating the relationship between the discharge time at the predetermined current value of the battery to be measured, the voltage between the terminals of the battery, and the remaining capacity is stored. With reference to the battery data storage unit, based on the discharge time in the discharge current discharged to the pseudo load device and the load and the voltage between the terminals of the battery corresponding to the discharge current in the discharge time, And calculates the remaining capacity of the battery.

  Further, as an example, the computer of the deterioration determination device that determines the deterioration state of the measurement target battery is connected to the output side from the means for reducing the output voltage from the rectifier that supplies power to the load. Means for measuring a current value flowing from the rectifier and the battery to a load connected in parallel to the output of the rectifier and a pseudo load device connected in parallel to the output of the rectifier separately from the load, the measurement result Means for controlling the load of the pseudo load device so that the current value becomes a predetermined current value, battery data indicating the relationship between the discharge time at the predetermined current value of the battery to be measured, the voltage between the terminals of the battery, and the remaining capacity The battery data storage unit for storing the discharge time for the discharge current discharged to the pseudo load device and the load, and the battery corresponding to the discharge current for the discharge time. Based on the child voltage, characterized in that to function as means for calculating the remaining capacity of the battery. __

  As described above, according to the present invention, since the pseudo load device is provided, the discharge current from the battery can be adjusted to be constant, and the discharge voltage characteristic can be obtained with high accuracy.

It is a schematic block diagram which shows the structure of the DC power supply device 1 with a secondary battery degradation diagnosis function to which the degradation determination apparatus by one Embodiment of this invention is applied. 2 is a schematic block diagram illustrating a configuration of a control device 100. FIG. 4 is a diagram illustrating an example of battery data stored in a battery data storage unit 104. It is drawing which shows an example of battery data. It is a flowchart for demonstrating operation | movement of the DC power supply device 1 with a secondary battery deterioration diagnostic machine. It is drawing for demonstrating operation | movement of the DC power supply device 1 with a secondary battery deterioration diagnostic machine. It is drawing for demonstrating the relationship between each setting voltage in a deterioration determination test, and the discharge voltage of a storage battery. It is the figure which showed typically the discharge curve of the battery in an initial state, and the discharge curve of the battery in the deterioration state in each remaining capacity. It is a figure which shows the difference (DELTA) V between the terminal voltage of the battery in an initial state, and the terminal voltage of the battery in a deteriorated state in each discharge time. It is a figure which shows the difference of the open circuit voltage of a 100% capacity | capacitance battery, and the voltage between terminals of the battery in which capacity | capacitance fell in arbitrary discharge elapsed time. It is drawing which shows an example of battery data. It is a schematic block diagram which shows the example of application of the secondary battery automatic degradation diagnostic machine in an alternating current power supply device. It is a schematic block diagram which shows the example of application of the secondary battery automatic degradation diagnostic machine in an alternating current power supply device.

Hereinafter, a deterioration determination apparatus according to an embodiment of the present invention will be described with reference to the drawings.
The deterioration determination apparatus according to the present embodiment causes a storage battery to be discharged for an arbitrary time at an arbitrary current to be specified at an arbitrary time to be specified, and estimates the deterioration state of the storage battery from the discharge characteristics at this time. . That is, in order to cause the storage battery to discharge while supplying power to the load facility, in this embodiment, the output voltage of the rectifier in operation is reduced to a specified value within the voltage range allowed by the load. . As a result, the storage battery is discharged. However, in this state, since the discharge current of the storage battery remains at the current value required by the load, in this embodiment, a pseudo load device is provided, and the storage battery is discharged at an arbitrary constant current that is designated. Adjust the current as follows. Thereby, it is possible to discharge with a constant current, and so-called “constant current discharge characteristics” can be obtained.

  Since the deterioration state of the storage battery appears in the time-dependent change curve of the voltage during constant current discharge, the voltage between the terminals of the target battery is measured at any specified elapsed time. Based on the measured inter-terminal voltage value, the capacity of the target battery is estimated by collating with battery data indicating the relationship between the deterioration of the storage battery and the inter-terminal voltage obtained in advance.

Hereinafter, a deterioration determination apparatus according to an embodiment of the present invention will be described.
FIG. 1 is a schematic block diagram showing a configuration of a DC power supply device 1 with a secondary battery deterioration diagnosis function to which a deterioration determination device according to an embodiment of the present invention is applied.
The DC power supply device 1 with the secondary battery deterioration diagnosis function includes a control device 100, an AC power supply 109, a rectifier 200, an AC power supply 300, a load 400, a pseudo load device 500, an assembled battery 600, a circuit disconnecting switch 700, a load current sensor 800, The battery pack includes a battery discharge current sensor 810, a temperature sensor 820, a voltage sensor 830, and a cell voltage adjustment circuit 900.

AC power supplied from the AC power supply 300 is converted into DC power by the rectifier 200 and supplied to the assembled battery 600 and the load 400. The assembled battery 600 is configured by connecting a plurality of lithium ion secondary batteries, is connected to the rectifier 200 and the load 400, and can be charged and discharged.
The AC power supply 109 supplies an AC current to the control device 100.
The pseudo load device 500 causes the assembled battery 600 to discharge based on the pseudo load control signal from the control device 100 so that the sum of the current values of the load 400 and the pseudo load device 500 becomes a predetermined current value. .
The circuit disconnecting switch 700 is turned on / off based on an on / off signal included in the simulated load control signal, and disconnects the simulated load device 500 from the assembled battery 600 when it is off.

  The load current sensor 800 measures the current value supplied to the load 400 and outputs the measurement result to the control device 100. The assembled battery discharge current sensor 810 detects the current supplied from the assembled battery 600 and outputs the detection result to the control device 100. The temperature sensor 820 measures the temperature of the assembled battery 600 and outputs the measurement result to the control device 100. The voltage sensor 830 detects the voltage of the assembled battery 600 and outputs the detection result to the control device 100. The cell voltage adjustment circuit 900 controls the voltage of each cell of the lithium ion secondary battery constituting the assembled battery 600.

Next, the configuration of the control device 100 will be described. FIG. 2 is a schematic block diagram showing the configuration of the control device 100.
The data input unit 101 inputs measurement results output from the load current sensor 800, the assembled battery discharge current sensor 810, the temperature sensor 820, and the voltage sensor 830, and outputs them to the control unit 103 and the calculation unit 105. The measurement condition set value input unit 102 has a function of accepting an input from a user, and includes a keyboard and function keys. The control unit 103 has a function of outputting a rectifier output control signal to the rectifier 200 and reducing the output voltage from the rectifier 200 within the set value range input from the measurement condition set value input unit 102. Further, the control unit 103 outputs a pseudo load control signal to the pseudo load device 500 so that the sum of the currents flowing through the load 400 and the pseudo load device 500 becomes the set value input from the measurement condition set value input unit 102. To control.

  The battery data storage unit 104 includes, for example, information on manufacturing and distribution of batteries such as manufacturers, delivery companies, manufacturing lots, etc., and “battery capacities having various remaining capacities and terminal voltage differences at arbitrary times”. Battery data indicating the relationship between the open capacity of a new battery (with a capacity of 100%) and the difference between the terminal voltages when discharging batteries with various remaining capacities and the remaining capacity, The difference between the charging voltage at the time (hereinafter sometimes referred to as “maintenance charging voltage” in the text or the figure) and the voltage between the terminals when the batteries having various remaining capacities are discharged. Battery data of “relationship between remaining capacity and battery” is stored. Here, the remaining capacity refers to the capacity held in the fully charged state in the backup storage battery in the power supply system as described above. An example of battery data stored in the battery data storage unit 104 is shown in FIG. Here, battery data indicating the relationship between the voltage between the terminals of the 100% capacity battery and the voltage between the terminals of the battery having a reduced capacity at an arbitrary discharge elapsed time is stored. The battery data is stored for each battery model (A to X) when the arbitrary current value is the current value I1 to In. An example of such storage is shown in FIG. Moreover, it produces for every various temperature Te (n) as needed.

  The arithmetic unit 105 compares the function of receiving the inter-terminal voltage value of the assembled battery 600 output from the data input unit 101 with the received inter-terminal voltage value and the data stored in the battery data storage unit 104 to perform measurement. It has a function of calculating the remaining capacity of the target battery and determining deterioration.

  The display unit 106 displays the calculation result of the calculation unit 105 with a meter. The power supply unit 107 converts AC100 [V] output from the AC power supply 109 into a DC power supply, and supplies the internal power supply of the deterioration determination apparatus 100. The data transmission unit 110 is connected to the terminal of the monitoring center via the external communication interface 108 and transmits data that is the calculation result of the calculation unit 105 to the terminal of the monitoring center. The cell voltage adjustment circuit control unit 111 outputs a control signal for controlling the cell voltage to the cell voltage adjustment circuit 900.

Next, operation | movement of the DC power supply device 1 with a secondary battery deterioration diagnostic machine mentioned above is demonstrated using the flowchart of FIG.
First, during standby (step S1), the load current supplied from the rectifier 200 to the load 400 is measured, and the maximum current value is calculated (step S2). Next, when an instruction to start deterioration determination processing is input from the measurement condition set value input unit 102 by the user, the deterioration determination processing is started (step S3). Here, following the instruction to start the deterioration determination process, a set value for the discharge time and a set value for the current, which are input by the user and continue to decrease the voltage output from the rectifier 200, are received.
When various set values are input, the control unit 103 outputs a rectifier output control signal to the rectifier 200 so as to lower the output voltage of the rectifier 200 (step S4).
Along with the output voltage from the rectifier, discharging from the assembled battery 600 is started. The control unit 103 causes the pseudo load device 500 to share such that the total of the current values flowing through the load 400 and the pseudo load device 500 (the value of the detection result by the assembled battery discharge current sensor 810) becomes a specified constant current value. The current value to be controlled is appropriately controlled by the pseudo load control signal (step S5).

  The control unit 103 also starts counting the storage battery discharge time from the time when the deterioration determination process is started (step S6). And the voltage between the terminals of the assembled battery 600 is measured by the voltage sensor 830 (step S7), and it is detected whether or not the voltage of the assembled battery 600 has decreased to a predetermined value (step S8). When the voltage of the assembled battery 600 drops to a predetermined value, the voltage drop of the rectifier is canceled to return the rectifier output voltage to the normal voltage, and an alarm is transferred to the terminal of the monitoring center (step S9). Migrate to

On the other hand, when the voltage of the assembled battery 600 is equal to or higher than a predetermined value, it is detected whether or not the count value of the storage battery discharge time has reached the discharge time input from the measurement condition set value input unit 102 (step S10). If the count value has not reached the discharge time, the process proceeds to step S5.
On the other hand, when the count value reaches the discharge time, the voltage between the terminals of the target battery at the discharge time is measured by the voltage sensor 830, and the measurement result of the temperature sensor 820 and the voltage value of the measurement result are recorded (step S11). . When the battery voltage is recorded as a result of detection by the temperature sensor 820, the calculation unit 105 refers to the battery data stored in the battery data storage unit 104 for the battery data corresponding to the measurement time and the measurement temperature, and the recorded battery Based on the voltage, the battery capacity is calculated (step S12).
For the calculation of the capacity of this battery, the “relation between the voltage difference between terminals at any time and the battery capacity” obtained from the discharge characteristics (time-varying characteristics of the voltage between terminals) of storage batteries having various remaining capacities can be used. . What is necessary is just to obtain | require the said relationship by arbitrary discharge current and arbitrary ambient temperature. In addition, the remaining capacity is calculated using “the relationship between the battery capacity and the difference between the open circuit voltage of a new battery (with a capacity of 100%) and the voltage between terminals when various remaining capacity batteries are discharged”. Is also possible. Furthermore, it is also possible to calculate the remaining capacity from “the relationship between the battery voltage and the difference between the charging voltage at the time of maintenance charging and the voltage between terminals when the batteries having various remaining capacities are discharged”. Here, based on the measurement result of the temperature sensor 820 and the battery model input from the measurement condition set value input unit 102, the battery data of the matching condition is selected and referred to.

When the battery capacity is calculated, the control unit 103 returns the output voltage of the rectifier 200 to the normal output voltage value (step S13), and then outputs the calculated battery capacity value (step S14). This output is performed by display on the display unit 106 and transmission from the data transmission unit 110 to the terminal of the external monitoring center.
And if a measurement result is output, the control part 103 will complete | finish a deterioration determination process (step S15).
During this process, power failure and rectifier failure detection are also performed in parallel. Once the above trouble occurs, power supply from the assembled battery 600 to the load 400 is continuously performed, and the capacity estimation work in this process is cancelled. After the end of the power failure, the output voltage of the rectifier 200 is set to a normal value, and power is supplied to the load 400 and the assembled battery 600 is charged.

Here, operation | movement of the DC power supply device 1 with a secondary battery deterioration diagnostic machine is further demonstrated using FIG.
When the deterioration determination test is started at time T1, the output voltage of the rectifier 200 decreases according to an instruction from the control unit 103 (symbol a). The output voltage of the rectifier 200 is set to a voltage that is higher than the lower limit value of the voltage range in which the load 400 can operate, and that the power supplied to the load 400 is only discharged from the storage battery. When the output voltage decreases, power is supplied from the assembled battery 600, so that a storage battery current is output (reference symbol b) and a pseudo load consumption current is generated (reference symbol c). When the specified discharge time has elapsed and the test is completed at time T2, the output voltage of the rectifier 200 returns to the normal voltage based on an instruction from the control unit 103, and charging of the assembled battery 600 is started. (Sign e). When the circuit changeover switch 700 of the pseudo load device 500 is turned off, the current consumption of the pseudo load device 500 becomes 0 (reference f). In this figure, a discharge current of the storage battery IB = dummy load current _{I DL} + load current _{I L.}

Further, the relationship between each set voltage during the deterioration determination test and the discharge voltage of the storage battery will be described with reference to FIG. The figure shows the upper and lower limits of the voltage supply voltage in the DC power supply system, the normal rectifier operating voltage Vn, and the rectifier voltage VT during the test. The rectifier voltage VT at the time of performing the test is set to a value higher than the lower limit voltage of the system. When the rectifier output voltage is set to the test voltage VT along with the start of the test, the storage battery discharge is started at the same time. In the case of a normal storage battery in which the capacity is not extremely lost, the voltage change with time changes along the discharge curve (symbol a), and the test ends at a predetermined time T2. In the case of a battery with a reduced capacity, discharge proceeds with a profile such as a discharge curve (symbol b), and the test ends in a time shorter than the set discharge time (point B). Since it becomes the same voltage as the rectifier output voltage at point B, it is impossible to discharge only from the storage battery, and the test is effectively terminated. The control unit 103 detects this state, performs capacity estimation at a stage before this time T3, ends the voltage drop operation of the rectifier, and returns to the normal voltage Vn. On the other hand, in case the control unit 103 overlooks the state of reaching the point B, the abnormality detection voltage VB is set to protect the system. This example is shown in the discharge curve (symbol c). That is, at the point B ′, when the control unit 103 fails to detect the end of the test, the discharge further proceeds. When the voltage drops to the lowest voltage VL of the system, the load may be affected.
Therefore, the abnormality detection voltage VB is set, and if the output from the system drops to this voltage, the test is terminated, and measures such as stopping the rectifier output drop and generating an alarm are taken.

  Here, the calculation for performing the capacity estimation described above can be performed several times instead of once as long as it is within the maximum value of the discharge time set at the start of the test. When the calculated value falls within the target accuracy (for example, the difference between the measurement values of 3 to 4 times is 5%), the test can be finished within the set discharge time. On the other hand, if it is not within the target system, the discharge is performed for the set discharge time, the capacity is estimated, and the test is terminated.

According to the embodiment described above, after calculating the battery capacity, the control unit 103 returns the output voltage of the rectifier 200 to an appropriate value. Thereby, the assembled battery 600 is charged together with the power supplied from the rectifier 200 to the load 400, and the quality of the power supplied to the load is not affected.
Further, according to this embodiment, when the battery voltage of the assembled battery 600 decreases to a predetermined value, the control unit 103 restores the output voltage to the rectifier 200, so that the assembled battery 600 is discharged. In preparation for a power failure after the deterioration judgment test, the assembled battery 600 can be prevented from being completely discharged. In addition, some detection voltage settings were made to prevent system problems from being tested.

  In the above-described embodiment, the case where the battery data storage unit 104 stores the battery data indicating the relationship between the voltage difference ΔV and the remaining capacity has been described. However, the data indicating the discharge curve illustrated in FIG. 8 is used. It may be. FIG. 8A is a diagram schematically showing a discharge curve of a battery in an initial state and a discharge curve of a battery in a deteriorated state at each remaining capacity. In this figure, Vcn (Tn) means a voltage between terminals when a discharge time Tn has elapsed when a battery having a remaining capacity of Cn is discharged. That is, the relationship between the remaining capacity and the voltage between terminals at various elapsed times is obtained for each battery model and discharge current. Here, FIG. 8B is a diagram showing the relationship between the terminal voltage and the remaining capacity after each elapsed discharge time of the battery having each remaining capacity. By using the relationship obtained in this way for capacity estimation, it is possible to estimate the capacity by measuring the voltage between terminals at the time when a specified discharge time has elapsed in a predetermined discharge current.

Also, other information can be used as the battery data stored in the battery data storage unit 104. FIG. 9 is a diagram showing a difference ΔV between the terminal voltage in the initial state and the terminal voltage in the deteriorated state at each discharge time. In FIG. 9, the terminal voltage in the initial state (discharge capacity is 100%) when the discharge time Tn has elapsed is denoted as V ₁₀₀ (Tn), and the terminal voltage at which the remaining capacity is reduced to 80% is V _The voltage between terminals at ₈₀ (Tn) and the remaining capacity is 60% is indicated as V ₆₀ (Tn). Further, in this figure, when the discharge time Tn has elapsed, the voltage difference ΔV between the terminal voltage V ₁₀₀ (Tn) in the initial state and the terminal voltage V ₆₀ (Tn) in the deteriorated state is indicated by an arrow b. .
Utilizing such discharge characteristics, the voltage difference ΔV ′ (sign (c) in FIG. 9) between the open circuit voltage Vopen of the battery in the initial state and the voltage between the terminals in the deteriorated state at each discharge time, and the remaining capacity Information indicating the relationship may be used.
FIG. 10 is a diagram showing the difference between the open-circuit voltage of a 100% capacity battery and the inter-terminal voltage with reduced capacity at an arbitrary discharge elapsed time. In this case, the battery data storage unit 104 stores battery data indicating the relationship shown in FIG. An example of the battery data stored in this way is shown in FIG. Such battery data is created for each battery model. Similarly, it is also possible to prepare a diagram for “the relationship between the battery voltage and the difference between the charging voltage at the time of maintenance charging and the voltage between terminals when batteries having various remaining capacities are discharged”. In an actual power supply system, since the battery is maintained by a charging device such as a rectifier, the relationship with the “charging voltage during maintenance charging” is more practical than the open circuit voltage.

In the embodiment described above, the case where the power supplied to the load 400 is a direct current has been described. However, the present invention can be applied not only to a direct current supply system but also to an alternating current supply system. 12 and 13 are schematic block diagrams illustrating application examples of the secondary battery automatic deterioration diagnosis device in the AC power supply apparatus. 12 and 13, in the AC power supply system provided with the dedicated charger for the backup storage battery, the charging voltage of the dedicated charger is adjusted instead of the voltage adjustment of the rectifier in the DC supply system, and the storage battery However, it is basically the same that the capacity is estimated by constant current discharge of the storage battery.
Note that the total voltage of the assembled battery 600 is measured in order to prevent the influence on the load due to overdischarge during the discharge for the test, and the discharge of the storage battery is stopped when the voltage drops to a preset risk prediction voltage value. You can also.

  Further, the program for realizing the function of the control device 100 in FIG. 1 is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into the computer system and executed to determine deterioration. You may go.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes design and the like within a scope not departing from the gist of the present invention.

  DESCRIPTION OF SYMBOLS 1 DC power supply device with a secondary battery deterioration diagnosis function 100 Control device 101 Data input part 102 Measurement condition set value input part 103 Control part 104 Battery data storage part 105 Calculation part 106 Display part 107 Power supply part 400 Load 500 Pseudo load apparatus 600 sets Battery 800 Load current sensor 810 Battery discharge current sensor 820 Temperature sensor 830 Voltage sensor

Claims (7)

A deterioration determination device for determining a deterioration state of a battery to be measured,
A rectifier in which a load and a battery to be measured are connected in parallel to an output terminal provided, and an output voltage corresponding to a supplied set value can be output to the output terminal;
A pseudo load device connected in parallel to the output terminal of the rectifier separately from the load;
A current measuring unit for measuring a current value of a discharge current of the battery flowing from the battery to the pseudo load device and the load;
A rectifier voltage control unit that controls a set value of the output voltage and sets the output voltage of the rectifier at the time of the deterioration determination test of the battery to a voltage for discharging the battery;
Deterioration in which the current value of the discharge current that flows through the pseudo load device and the load by discharging the battery during the deterioration determination test is determined according to the current flowing through the load before the deterioration determination test is performed. A control unit for controlling the current flowing through the pseudo load device so as to have a predetermined current value exceeding the current value before the judgment test;
A deterioration determination device comprising: The current measuring unit includes:
A load current measurement unit for measuring a current value of a current flowing through the load;
A discharge current measuring unit for measuring a current value of a discharge current of the battery;
With
The controller is
Based on the current value before the deterioration determination test determined from the current value of the current flowing through the load measured by the load current measuring unit, the predetermined current value exceeding the measured current value before the deterioration determination test. A discharge current value of the discharge current of the battery is determined, and the battery is supplied to the pseudo load device so that the current value of the discharge current supplied to the pseudo load device and the load when the deterioration determination test is performed becomes the discharge current value. The deterioration determination apparatus according to claim 1, wherein the current is controlled. A discharge current of the discharge current value is allowed to flow from the battery to the pseudo load device and the load, and a discharge time at the discharge current of the discharge current value and between the terminals of the battery corresponding to the discharge current at the discharge time The deterioration determination device according to claim 2, further comprising: an arithmetic unit that calculates a remaining capacity of the battery based on a voltage. The rectifier voltage controller is
By controlling the set value of the output voltage, the output voltage of the rectifier at the time of performing the battery deterioration determination test is higher than the lower limit voltage of the voltage range allowed by the load, and before performing the deterioration determination test The deterioration determination device according to any one of claims 1 to 3, wherein the deterioration determination device uses a voltage lower than a set voltage for discharging the battery. The rectifier voltage controller is
The voltage of the rectifier is lowered when the voltage of the battery falls below a predetermined threshold voltage in a situation where power is supplied from the battery to the load and the pseudo load device when the deterioration judgment test is performed. The deterioration determination apparatus according to any one of claims 1 to 4, wherein the control state that is being controlled is released. A deterioration determination method for determining a deterioration state of a battery to be measured,
From the rectifier in which the load and the battery to be measured are connected in parallel to the output terminal of the rectifier, enabling the output voltage corresponding to the supplied set value to be output to the output terminal;
Connecting a pseudo load device in parallel to the output terminal of the rectifier separately from the load;
A current measuring unit measuring a current value of a discharge current of the battery flowing from the battery to the pseudo load device and the load;
A step in which a rectifier voltage control unit controls a set value of the output voltage to set the output voltage of the rectifier at the time of the battery deterioration determination test to a voltage for discharging the battery;
Deterioration in which the current value of the discharge current that flows through the pseudo load device and the load by discharging the battery during the deterioration determination test is determined according to the current flowing through the load before the deterioration determination test is performed. Controlling a current flowing through the pseudo load device so as to be a predetermined current value that exceeds a pre-judgment test current value;
A degradation determination method comprising: In the computer of the deterioration determination device that determines the deterioration state of the battery to be measured,
From the rectifier in which the load and the battery to be measured are connected in parallel to the output terminal of the rectifier, enabling the output voltage corresponding to the supplied set value to be output to the output terminal;
Connecting a pseudo load device in parallel to the output terminal of the rectifier separately from the load;
A current measuring unit measuring a current value of a discharge current of the battery flowing from the battery to the pseudo load device and the load;
A step in which a rectifier voltage control unit controls a set value of the output voltage to set the output voltage of the rectifier at the time of the battery deterioration determination test to a voltage for discharging the battery;
Deterioration in which the current value of the discharge current that flows through the pseudo load device and the load by discharging the battery during the deterioration determination test is determined according to the current flowing through the load before the deterioration determination test is performed. Controlling a current flowing through the pseudo load device so as to be a predetermined current value that exceeds a pre-judgment test current value;
A program for running

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