JP2017009422A - Storage battery diagnostic measurement device and storage battery diagnostic measurement method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a storage battery diagnostic measurement device and a storage battery diagnostic measurement method that are unaffected by a voltage drop when a discharge current flows in cases where a diode is used as means for preventing an abnormal current from flowing into a current control unit that uses a semiconductor element when terminal polarities are connected in reverse.SOLUTION: A storage battery diagnostic measurement device 10 comprises: a current control unit 11 connected between terminals of a storage battery to be diagnosed and capable of controlling a current discharged from the storage battery to be diagnosed; a voltage detection unit 15 for detecting the terminal voltage of the storage battery to be diagnosed; a main control unit 16 for controlling the current control unit 11 and discharging a current needed for diagnosis from the storage battery to be diagnosed for a prescribed time, and measuring a change in the terminal voltage of the storage battery to be diagnosed that is detected by the voltage detection unit 15; a rectification unit 13 configured by including a diode and connected in series to the current control unit; and a voltage compensation unit 14 connected in series to the rectification unit 13, the voltage compensation unit 14 consisting of a storage battery for voltage compensation that is charged with a voltage equivalent to or higher than the forward drop voltage of the diode.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a storage battery diagnostic measuring apparatus and a storage battery diagnostic measuring method for diagnosing deterioration of a storage battery used for an uninterruptible power supply (UPS), an emergency backup power supply, and the like.

Conventionally, as a diagnostic apparatus for diagnosing deterioration of a storage battery, for example, there is a technique described in Patent Document 1. In this technology, a current control unit using a semiconductor element is connected between terminals of a storage battery, and the current control unit outputs a constant current necessary for diagnosis, and discharges for a short time. The situation of a storage battery is grasped | ascertained from this change. Here, in order to prevent an abnormal current from flowing in the current control unit when the polarity of the diagnostic device is accidentally connected to the storage battery, a disconnector having a mechanical contact is inserted in the circuit. After detecting that the connection is normal, the disconnector is turned on to start diagnosis.
Moreover, as another diagnostic apparatus, there exists a technique of patent document 2, for example. In this technique, a diode for preventing reverse current is inserted in a circuit in order to prevent generation of abnormal current when a diagnostic apparatus is reversely connected.
Furthermore, as a device capable of making a diagnosis even when a diagnostic device is reversely connected, there is a technique described in Patent Document 3, for example. In this technique, a semiconductor element constituting a current control unit is added, and two semiconductor elements are provided in reverse in series.

Japanese Patent No. 3213910 JP 2004-144621 A Japanese Patent No. 4372624

However, in the technique described in the above-mentioned Patent Document 1, since a disconnector having a mechanical contact is used, the device capacity is increased, the reliability of the contact is lowered, and the power supply capacity to cover the power for driving the disconnector There are problems such as increase.
In the technique described in Patent Document 2, since a forward voltage drop occurs when a current flows through a diode for preventing reverse current, in particular, the terminal voltage of the diagnostic storage battery is reduced in the forward voltage drop. When the voltage is low, the voltage sufficient for control cannot be applied to the current control unit, and the current necessary for diagnosis cannot be appropriately passed.
Further, in the technique described in Patent Document 3, since the number of semiconductor elements constituting the current control unit is increased, the driving of the current control unit is complicated and the apparatus is increased in size.
Therefore, the present invention provides a method in which a discharge current flows when a diode is used as a means for preventing an abnormal current from flowing in a current control unit using a semiconductor element when the terminal polarity is reversely connected. It is an object of the present invention to provide a storage battery diagnostic measuring device and a storage battery diagnostic measuring method that are not affected by a voltage drop.

In order to solve the above problems, one aspect of a storage battery diagnostic measuring device according to the present invention is connected between terminals of a diagnostic storage battery, and a current control unit capable of controlling a current discharged from the diagnostic storage battery;
A voltage detection unit that detects a terminal voltage of the diagnosis storage battery and the current control unit are controlled to discharge a current necessary for diagnosis from the diagnosis storage battery for a predetermined time, and at least during the discharge, the diagnosis storage battery As information necessary for diagnosis, a main controller that measures a change in the terminal voltage of the diagnostic storage battery detected by the voltage detector, and a rectifier that includes a diode and is connected in series with the current controller And a voltage compensator connected in series with the rectifier, and the voltage compensator comprises a voltage compensating storage battery charged with a voltage equal to or higher than the forward drop voltage of the diode.

  As described above, since the rectifying unit including the diode is provided, even if the measuring device is reversely connected to the diagnostic storage battery, an uncontrollable current flows through the parasitic diode of the semiconductor element of the current control unit. Can be prevented. In addition, as a means for preventing the occurrence of abnormal current during reverse connection, a disconnector or the like having a mechanical contact as in the conventional device is not used, so the device is downsized, the reliability of the contact is improved, and the driving power is covered. Therefore, there is an advantage of reducing the power capacity.

Furthermore, since the voltage compensation unit for compensating for the forward voltage drop of the diode constituting the rectifying unit is provided, the current control unit is provided with a current control unit even when the terminal voltage of the diagnostic storage battery is low, such as the forward voltage drop. On the other hand, a voltage sufficient for control can be applied. Therefore, a current necessary for diagnosis can be appropriately passed, and highly accurate measurement can be performed.
In addition, since the diagnostic current can flow only in one direction due to the action of the rectifying unit, it is not necessary to connect two semiconductor elements in series in the reverse direction as in the conventional device, and the current control unit is The number of parts to be configured can be reduced. Therefore, driving of the current control unit can be simplified correspondingly, and downsizing of the apparatus can be realized.

The voltage compensator comprises a voltage compensating storage battery charged with a voltage equal to or higher than the forward drop voltage of the diode.
Thus, if the voltage compensation storage battery is charged with a voltage corresponding to the forward drop voltage of the diode, in particular, even if the terminal voltage of the diagnostic storage battery is as low as the forward drop voltage, A voltage sufficient for control can be reliably applied to the current control unit. In addition, the voltage compensator can be realized with a relatively simple configuration.

The voltage compensation storage battery is precharged with a voltage equal to or higher than the forward drop voltage of the diode. For this reason, the voltage compensation storage battery is charged in advance at a predetermined voltage equal to or higher than the known forward drop voltage of the diode, and discharged at this voltage, so that the terminals of the diagnostic storage battery are discharged over the discharge period. Regardless of the voltage change, reliable voltage compensation can be realized with a simple configuration.
That is, when the voltage compensation unit is configured by a control circuit such as a constant voltage control circuit, complicated control must be executed for voltage compensation, and further, the voltage compensation unit is used in this constant voltage control circuit. Semiconductor components that are required to control large currents increase the size and cost of the device.
On the other hand, according to an aspect of the present invention, the voltage compensation unit is configured by a voltage compensation storage battery, so that complicated control derived from constant voltage control is not necessary, and downsizing of the apparatus and reduction in manufacturing cost can be achieved. realizable.

Further, in the above storage battery diagnostic measuring apparatus, the rectifying unit is constituted by one reverse blocking diode, and the voltage compensating unit generates a voltage equivalent to at least a forward drop voltage of the reverse blocking diode. You may compensate.
Thereby, it is possible to solve the problem that an abnormal current flows through the current control unit when the measuring device is reversely connected to the diagnostic storage battery with a simple configuration. In addition, it is possible to reliably compensate for the forward voltage drop generated by passing a diagnostic current through the rectifier.

Further, in the above storage battery diagnostic measurement device, the rectifier unit is configured by a bridge diode in which four diodes are connected in a bridge shape, and the voltage compensation unit includes at least the four diodes among the four diodes. A voltage equivalent to the forward voltage drop of the two diodes through which current flows during discharge may be compensated.
In this way, by configuring the rectifying unit with a bridge diode, it is possible to apply a voltage with the same polarity to the current control unit regardless of the polarity of the connection terminal of the measuring device. That is, information necessary for diagnosis of the diagnosis storage battery can be measured regardless of the polarity of the connection terminal of the measuring device. In addition, it is possible to reliably compensate for a forward voltage drop generated by passing a diagnostic current through a diode configured as a bridge.

Further, in the storage battery diagnostic measurement device, the voltage compensation storage battery is at least equal to or more than a voltage that compensates for the forward voltage drop of the diode and the voltage drop due to the circuit resistance of the storage battery diagnostic measurement device. The battery may be charged at a voltage of Thereby, even if it is a case where the terminal voltage of a diagnostic storage battery is low, it can be in the state by which the voltage required for control was applied with respect to the current control part. Therefore, a current necessary for diagnosis can be appropriately passed, and highly accurate measurement can be performed.
The voltage compensation unit also compensates for a voltage drop caused by an electrical resistance present in the circuit of the storage battery diagnostic measurement device, for example, a resistance of a connection line with the voltage compensation unit in the storage battery diagnostic measurement device. Good. For this reason, even if the resistance value which exists in the circuit of the said storage battery diagnostic measuring apparatus increases by making the said connection line thin or long, the voltage required for control is applied with respect to a current control part. It becomes possible. As a result, it is possible to appropriately supply a current necessary for diagnosis, and it is possible to perform highly accurate measurement, and it is also possible to reduce the size and weight of the apparatus.

  Similarly, the voltage compensation unit may compensate for a voltage drop caused by a resistance value of a conductor wire of a probe unit connecting a storage battery diagnostic measuring device and a diagnostic storage battery, a connection resistance to a terminal, or the like. Therefore, even if the resistance value between the connection terminal of the storage battery diagnostic measuring device and the positive electrode or negative electrode terminal of the diagnostic storage battery is increased by thinning or lengthening the conductor wire of the probe section, the current A voltage required for control can be applied to the control unit. As a result, a current necessary for diagnosis can be appropriately flown, high-precision measurement can be performed, and a probe operated by an operator at the time of diagnosis can be reduced in size and weight. Furthermore, since the probe portion can be lengthened, the storage battery diagnostic measuring device can be installed at a location away from the diagnostic storage battery. Thereby, it is not necessary to perform measurement while holding the storage battery diagnostic measuring device. In addition, since it is not necessary to carry the entire storage battery diagnostic measuring device to the measurement location, it is possible to measure by carrying only the probe part connecting the storage battery diagnostic measuring device and the diagnostic storage battery to the work place. Workability in confined places is dramatically improved.

Another aspect of the storage battery diagnostic measuring apparatus according to the present invention is a current control unit that is connected between terminals of the diagnostic storage battery and that can control a current discharged from the diagnostic storage battery, and the diagnostic storage battery. The voltage detection unit for detecting the terminal voltage of the battery and the current control unit are controlled to discharge a current necessary for diagnosis from the diagnosis storage battery for a predetermined time, and at least at the time of the discharge, necessary for diagnosis of the diagnosis storage battery As information, a main control unit that measures a change in the terminal voltage of the diagnostic storage battery detected by the voltage detection unit, a rectification unit that includes a diode and is connected in series with the current control unit, and the rectification Voltage compensation unit connected in series with the unit, the voltage compensation unit,
It comprises an electric double layer capacitor charged with a voltage equal to or higher than the forward drop voltage of the diode, or a voltage compensation circuit in which the electric double layer capacitor and a voltage compensating storage battery are connected in parallel.
In this way, the voltage compensation unit is configured with an electric double layer capacitor charged with a voltage equal to or higher than the forward drop voltage of the diode, or a voltage compensation circuit in which the electric double layer capacitor and the voltage compensation storage battery are connected in parallel. For example, in addition to the above-described effects, the discharge operation can be performed with the characteristics inherent to the component, so that the voltage compensation unit can be realized with a relatively simple configuration, and for stable voltage compensation. There is no need for complicated control.

In the storage battery diagnostic measuring apparatus, the voltage compensation unit compensates the forward voltage drop without performing constant voltage control. Accordingly, by not performing the constant voltage control, it is not necessary to provide a control circuit such as a constant voltage control circuit and execute complicated control for voltage compensation. In addition, a large current can be discharged in a short time with a simple configuration.
That is, when the voltage compensation unit is configured by a control circuit such as a constant voltage control circuit, complicated control must be executed for voltage compensation, and further, the voltage compensation unit is used in this constant voltage control circuit. Semiconductor components that are required to control large currents increase the size and cost of the device.
On the other hand, according to an aspect of the present invention, since constant voltage control is not performed, complicated control derived from constant voltage control is not necessary, and downsizing of the apparatus and reduction in manufacturing cost can be realized.

Furthermore, one aspect of the measurement method for storage battery diagnosis according to the present invention is generated in the rectification unit when a diagnostic current required for diagnosis is discharged from the diagnosis storage battery through a rectification unit including a diode for a predetermined time. The diagnostic current is discharged while compensating at least the forward voltage drop by a voltage compensating storage battery charged at a voltage equal to or higher than the forward voltage drop, and at least during the discharge, the diagnosis of the diagnostic storage battery is performed As information necessary for the measurement, a change in the terminal voltage of the diagnostic storage battery is measured.
As a result, when a diode is used as a means for preventing an abnormal current from flowing to the current control unit using the semiconductor element when the terminal polarity is reversely connected, the voltage drop when the discharge current flows is reduced. Information necessary for diagnosis of the diagnostic storage battery can be appropriately measured without causing an influence.

  Since the storage battery diagnostic measuring device of the present invention includes a rectifying unit including a diode, an abnormal current is generated in the current control unit when the measuring device is reversely connected to the diagnostic storage battery with a simple and inexpensive configuration. It can be prevented from flowing. In addition, since the voltage compensation unit for compensating for the forward voltage drop generated in the rectifying unit is provided, the voltage when the discharge current flows even when the terminal voltage of the diagnostic storage battery is low, such as the forward voltage drop. Information for appropriately diagnosing the storage battery to be diagnosed can be measured without being affected by the drop. Furthermore, in the voltage compensation unit, not only the forward voltage drop is compensated, but also the circuit resistance of the measuring device, the resistance of the conductor wire of the probe unit connecting the diagnostic storage battery and the measuring device, and the connection part to the terminal In order to compensate for the voltage that drops when the discharge current flows due to the contact resistance of the battery, in order to properly diagnose the diagnosis storage battery without the influence of the voltage drop due to the element or measurement circuit when the discharge current flows Necessary information can be measured. Furthermore, by not performing the constant voltage control, it is not necessary to provide a control circuit such as a constant voltage control circuit and execute complicated control for voltage compensation. In addition, a large current can be discharged in a short time with a simple configuration.

It is a block diagram which shows the structure of the storage battery diagnostic apparatus (measurement apparatus for storage battery diagnosis) of 1st Embodiment. It is a figure which shows an example of the electric current control part in 1st Embodiment. It is a flowchart which shows the diagnostic processing procedure performed with the main control part in 1st Embodiment. It is a figure which shows an example of the time transition of the terminal voltage and discharge current at the time of diagnosis. It is a block diagram which shows the storage battery diagnostic apparatus of 2nd Embodiment. It is a flowchart which shows the diagnostic processing procedure performed with the main control part in 2nd Embodiment. It is a block diagram which shows the structure of the storage battery diagnostic apparatus (measurement apparatus for storage battery diagnosis) of 3rd Embodiment. It is a block diagram which shows the structure of the storage battery diagnostic apparatus (measurement apparatus for storage battery diagnosis) of 4th Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a block diagram showing a configuration of a storage battery diagnostic device (storage battery diagnostic measuring device) 10 of the present embodiment.
The storage battery diagnosis device 10 is a device for diagnosing deterioration of the diagnosis storage battery 20 used for an uninterruptible power supply (UPS), an emergency backup power supply, or the like.
The storage battery diagnostic device 10 includes connection terminals 10a to 10d. The storage battery diagnostic device 10 is diagnosed by connecting the connection terminals 10a and 10c to the positive electrode terminal 21 of the diagnosis storage battery 20 and the connection terminals 10b and 10d to the negative electrode terminal 22 of the diagnosis storage battery 20 with a hook clip or the like. The storage battery 20 can be diagnosed.

The storage battery diagnosis device 10 includes a current control unit 11, a current detection unit 12, a rectification unit 13, a voltage compensation storage battery 14, a voltage detection unit 15, and a main control unit 16.
The storage battery diagnostic device 10 forms the closed circuit A by connecting the connection terminal 10 a to the positive terminal 21 and connecting the connection terminal 10 b to the negative terminal 22. The current control unit 11, the current detection unit 12, the rectification unit 13, and the voltage compensation storage battery 14 are connected to the closed circuit A in series.
Further, the voltage detection unit 15 is connected in parallel to the closed circuit A by connecting the connection terminal 10 c to the positive electrode terminal 21 and connecting the connection terminal 10 d to the negative electrode terminal 22.

The current control unit 11 receives a control signal from the main control unit 16 and controls a discharge current necessary for diagnosis of the diagnosis storage battery 20. For example, as shown in FIG. 2, the current control unit 11 includes a semiconductor element such as a MOSFET, and a current discharged from the diagnostic storage battery 20 when a voltage is applied from the main control unit 16 to the gate. Can be controlled.
The current detection unit 12 detects the discharge current flowing through the closed circuit A and outputs the detected current value to the main control unit 16.
The rectifying unit 13 has a configuration in which a reverse blocking diode is connected to the closed circuit A in series. The anode of the reverse blocking diode is connected to the connection terminal 10 a side with the positive electrode terminal 21, and the cathode is connected to the current control unit 11 side. Thereby, when the storage battery diagnostic apparatus 10 is reversely connected by making a mistake in the polarity of the storage battery 20 to be diagnosed, an uncontrolled current is prevented from flowing through the parasitic diode of the MOSFET constituting the current control unit 11.

The voltage compensation storage battery 14 has a positive electrode terminal 14a connected to the rectifying unit 13 side and a negative electrode terminal 14b connected to the connection terminal 10a side. The storage battery 14 for voltage compensation is a voltage compensation unit that compensates for a forward voltage drop that occurs when a diagnostic current flows through a reverse blocking diode that constitutes the rectification unit 13, and is equal to or higher than the forward voltage drop. It shall be charged with voltage.
The forward voltage drop generated in the diode is about 1.5 V for the silicon diode and about 0.6 V for the Schottky barrier diode. For this reason, the charging voltage of the voltage compensation storage battery 14 is set to 1.5 V or more, and here, for example, about 2 V.
The voltage detector 15 detects the terminal voltage of the diagnostic storage battery 20 and outputs the detected voltage value to the main controller 16.

The main control unit 16 outputs a control signal to the current control unit 11, conducts the current control unit 11 for a preset discharge time T <b> 1, and outputs a discharge current to the closed circuit A. Here, the discharge time T1 is about 0.5 seconds to 1.5 seconds, and is, for example, 0.5 seconds here.
At this time, the main control unit 16 feeds back the current detection value acquired from the current detection unit 12 and controls the current control unit 11 so that the discharge current becomes a preset diagnostic current value.
Further, the main control unit 16 acquires the voltage detection value detected by the voltage detection unit 15 during the measurement time T2 (> T1) set in advance from the start of discharge. Then, the main control unit 16 diagnoses the deterioration of the diagnostic storage battery 20 based on the voltage detection value at the time of discharge acquired during the measurement time T2 and the voltage detection value at the time of recovery after the end of discharge.

Hereinafter, the diagnosis process of the diagnosis storage battery 20 executed by the main control unit 16 will be specifically described.
FIG. 3 is a flowchart showing a diagnostic processing procedure executed by the main control unit 16. The main control unit 16 starts the diagnosis process when the storage battery diagnosis device 10 is turned on.
First, in step S <b> 1, the main control unit 16 initializes various parameters used for diagnosis processing of the diagnosis storage battery 20. Specifically, the control signal output to the current control unit 11 is set to a value at which the output of the current control unit 11 becomes zero, and the discharge is terminated after the discharge of the diagnostic storage battery 20 is started. And the count value N for measuring the period (measurement period) T2 from the start of discharge of the diagnostic storage battery 20 to the end of measurement of the terminal voltage (zero).

Next, in step S <b> 2, the main control unit 16 sets a diagnostic current value Ia that is a current value necessary for diagnosis of the diagnostic storage battery 20. Here, the diagnostic current value Ia may be a fixed value set in advance, or may be obtained by setting a value input by an operator of the storage battery diagnostic device 10 from a predetermined operation unit (for example, a numeric keypad). Also good.
Next, in step S <b> 3, the main control unit 16 determines whether or not the storage battery diagnostic device 10 is connected to the diagnostic storage battery 20. For example, the main control unit 16 determines that the storage battery diagnostic device 10 is connected to the diagnosis storage battery 20 by detecting that the operator has pressed a button for confirming completion of preparation provided in the storage battery diagnostic device 10. Then, the main control unit 16 waits until it is determined that the storage battery diagnostic device 10 is connected to the diagnosis storage battery 20, and when it is determined that the storage battery diagnosis device 10 is connected to the diagnosis storage battery 20, the main control unit 16 proceeds to step S4.

In step S4, the main control unit 16 acquires a voltage detection value from the voltage detection unit 15, and proceeds to step S5.
In step S5, the main control unit 16 confirms the polarity and voltage range between the terminals based on the voltage detection value acquired in step S4, and the connection terminals 10a to 10d of the storage battery diagnostic device 10 are normally connected. It is determined whether or not. Here, the main control unit 16 determines that the terminal connection is normal when the voltage detection value acquired in step S4 is a positive value, and the voltage detection value acquired in step S4 is a negative value. In some cases, it is determined that the terminal connection is not normal.

When the main control unit 16 determines that the terminal connection is not normal, the main control unit 16 proceeds to step S6. When the main control unit 16 determines that the terminal connection is normal, the main control unit 16 proceeds to step S7.
In step S6, the main control unit 16 notifies the operator that the terminal connection is not normal by issuing an alarm, prompts the reconnection of the storage battery diagnostic device 10, and then proceeds to step S3. The means for notifying that the terminal connection is not normal is not limited to the alarm, and voice guidance, monitor display, or the like may be used.
In step S7, the main control unit 16 determines that preparation for starting diagnosis of the diagnosis storage battery 20 is completed, and displays this on a monitor or the like (not shown), for example.

Next, in step S <b> 8, the main control unit 16 outputs a control signal to the current control unit 11 and starts the semiconductor conduction of the current control unit 11. At this time, the main control unit 16 acquires a current detection value from the current detection unit 12, and feeds back the current control unit 11 so that a current corresponding to the diagnostic current value Ia set in step S2 flows from the diagnostic storage battery 20. Control. Moreover, the main control part 16 starts the count of the count value N for measuring the discharge time T1 and the measurement time T2 in this step S8.
Next, in step S9, the main control unit 16 acquires a voltage detection value from the voltage detection unit 15, acquires a current detection value from the current detection unit 12, and stores these in a memory (not shown).

In step S10, the main control unit 16 determines whether or not a preset discharge time T1 has elapsed since the current control unit 11 started current conduction. That is, the main control unit 16 determines whether or not the count value N has reached a value corresponding to the discharge time T1. If the count value N has not reached the value corresponding to the discharge time T1, it is determined that the discharge time T1 has not elapsed since the start of discharge, and the process proceeds to step S9. When the value corresponding to the discharge time T1 has been reached, it is determined that the discharge time T1 has elapsed since the start of the discharge, and the discharge is finished, and the process proceeds to step S11.
In step S11, the main control unit 16 outputs a control signal for ending the semiconductor conduction to the current control unit 11, and ends the discharge.

Next, in step S12, the main control unit 16 acquires a voltage detection value from the voltage detection unit 15, acquires a current detection value from the current detection unit 12, and stores these in a memory (not shown).
In step S <b> 13, the main control unit 16 determines whether or not a preset measurement time T <b> 2 has elapsed since the current control unit 11 started current conduction. That is, the main control unit 16 determines whether or not the count value N has reached a value corresponding to the measurement time T2. If the count value N has not reached the value corresponding to the measurement time T2, it is determined that the measurement time T2 has not elapsed since the discharge was started, and the process proceeds to step S12. When the value corresponding to the measurement time T2 has been reached, it is determined that the measurement time T2 has elapsed since the start of discharge and the measurement of the terminal voltage and the discharge current is to be terminated, and the process proceeds to step S14. .

In step S14, the main control unit 16 diagnoses deterioration of the diagnosis storage battery 20 based on the voltage detection value and the current detection value stored in the memory in steps S9 and S12.
FIG. 4 is a diagram illustrating an example of a temporal transition of the terminal voltage and the discharge current of the diagnostic storage battery 20. In FIG. 4, the time t1 is the time when the discharge is started, the time t2 is the time when the discharge is finished, and the time t3 is the time when the measurement is finished. That is, the time from time t1 to time t2 is the discharge time T1, and the time from time t1 to time t3 is the measurement time T2.
Factors that decrease the discharge capacity of the diagnostic storage battery 20 include a decrease in electromotive force itself and an increase in internal resistance. Since both cause a decrease in the terminal voltage during discharge, it is possible to determine whether or not the discharge capacity of the diagnostic storage battery 20 has decreased by monitoring the change in the terminal voltage during discharge. In this way, it is possible to diagnose a decrease in discharge capacity in a short time.

Further, it is possible to grasp the state of the electromotive force and the state of the internal resistance separately from the change in the terminal voltage after the discharge is terminated at time t2. As shown in FIG. 4, the terminal voltage of the diagnostic storage battery 20 suddenly increases to a certain value (here, from voltage Va to Vb) when the discharge ends. By dividing this rapid voltage rise (Vb−Va) by the discharge current Ia, the value of the internal resistance Ri can be obtained approximately.
Ri = (Vb−Va) / Ia (1)
Thus, the state of the internal resistance Ri can be grasped based on the discharge current Ia, the storage battery terminal voltage Va measured immediately before the end of discharge, and the storage battery terminal voltage Vb measured immediately after the end of discharge. Further, the voltage value Vb that is instantaneously restored immediately after the end of discharge is substantially equal to the electromotive force of the diagnostic storage battery 20 at that time. Therefore, the state of electromotive force can be grasped by detecting the voltage value Vb.

As described above, by continuously measuring the terminal voltage even after the discharge is finished, it is possible to separate and grasp the state of the electromotive force and the state of the internal resistance, and diagnose the diagnosis storage battery 20 in more detail. be able to.
As described above, in the present embodiment, when the operator connects the storage battery diagnosis device 10 to the diagnosis storage battery 20, the main control unit 16 controls the current control unit 11 to make a diagnosis set from the diagnosis storage battery 20 for a short time. The current value Ia is discharged. And the main control part 16 measures the terminal voltage of the diagnostic storage battery 20 which falls with discharge time progress.
When the set discharge time T1 elapses, the main control unit 16 ends the conduction of the current control unit 11 and ends the discharge of the diagnostic storage battery 20. At this time, the main control unit 16 continues to measure the terminal voltage even after the discharge is finished. Then, the main control unit 16 measures the terminal voltage of the diagnostic storage battery 20 that recovers and rises with the passage of time after the end of discharge. Thereafter, when the measurement time T2 elapses from the time when the discharge is started, the main control unit 16 ends the measurement of the terminal voltage.

Thus, the main control unit 16 diagnoses the deterioration of the diagnostic storage battery 20 by measuring and analyzing the change in the terminal voltage at the time of discharge and the change in the terminal voltage at the time of recovery after the end of the discharge. Therefore, the deterioration of the diagnosis storage battery 20 can be diagnosed in a short time. In addition, since not only the change in the terminal voltage at the time of discharge but also the change in the terminal voltage immediately after the end of the discharge is monitored, whether the diagnostic storage battery 20 has deteriorated due to the decrease in electromotive force and the capacity has decreased, It is possible to determine whether it has decreased. Therefore, it is possible to accurately diagnose the deterioration of the diagnosis storage battery 20.
Further, the storage battery diagnostic device 10 has a configuration in which a rectifying unit 13 made of a reverse blocking diode is inserted in series with the current control unit 11. Therefore, even if the storage battery diagnostic device 10 is reversely connected, that is, the connection terminals 10a and 10c are connected to the negative terminal 22, and the connection terminals 10b and 10d are connected to the positive terminal 21. It is possible to prevent an abnormal current that cannot be controlled from flowing through the parasitic diode of the MOSFET constituting the current control unit 11. As a result, failure of the current control unit 11 can be prevented.

By the way, as a means for preventing abnormal current from flowing through the current control unit when the diagnostic device is reversely connected, for example, an electromagnetic contactor (such as a disconnector) having a mechanical contact in the circuit is inserted, A method is conceivable in which measurement is performed after a disconnector or the like is turned on after detecting a normal connection. However, in such a diagnostic device using a disconnector having a mechanical contact, there are problems such as a decrease in the reliability of the contact due to multiple use and the necessity of electric power for driving the disconnector. doing.
On the other hand, in the present embodiment, a reverse blocking diode, which is a semiconductor element, is used to prevent the occurrence of abnormal current during reverse connection, so a disconnector having a mechanical contact in the circuit is used. Compared to the case, it is possible to reduce the driving power and reduce the size of the apparatus. Further, since no mechanical contact is used, there is no worn portion, and the reliability of the contact can be improved.

In addition, the storage battery diagnosis device 10 includes a voltage compensation storage battery 14 that compensates for a forward drop voltage in a reverse blocking diode that constitutes the rectification unit 13 in series with the rectification unit 13. Therefore, even if the voltage applied to the current control unit 11 decreases by about 0.6 V to 1.5 V, which is the forward voltage drop of the reverse blocking diode of the rectifying unit 13, the charging voltage of the voltage compensating storage battery 14 is reduced. A value of about 2V, which is a minute, is a compensated value.
If the voltage compensation storage battery 14 is not provided, for example, when the terminal voltage of the diagnostic storage battery 20 is as low as 2 V or less, a voltage sufficient to control the current by the current control unit 11 can be secured. Therefore, the diagnosis storage battery 20 cannot be diagnosed.

On the other hand, in this embodiment, since the voltage compensation storage battery 14 for compensating for the forward voltage drop generated in the rectifying unit 13 is provided in series with the rectifying unit 13, the current is controlled by the current control unit 11. Therefore, a sufficient voltage can be secured.
Therefore, for example, even when the terminal voltage of the diagnostic storage battery 20 is as low as 2 V or less, a voltage sufficient for control can be applied to the current control unit 11, and the discharge current is set to the set diagnostic current value Ia. be able to. Therefore, the diagnosis storage battery 20 can be diagnosed with high accuracy.
Thus, the diagnosis storage battery 20 can be diagnosed without being affected by the voltage drop when the discharge current flows.

(Second Embodiment)
Next, a second embodiment of the present invention will be described.
In the second embodiment, the diagnosis storage battery 20 can be diagnosed even when the storage battery diagnosis device 10 is reversely connected.
FIG. 5 is a block diagram illustrating a configuration of the storage battery diagnostic device 10 according to the second embodiment.
The storage battery diagnostic device 10 of the present embodiment includes a rectification unit 17 instead of the rectification unit 13 in the above-described storage battery diagnosis device 10 of FIG. 5, parts having the same configuration as that of the storage battery diagnosis device 10 of FIG. 1 are denoted by the same reference numerals as those in FIG.
As shown in FIG. 5, the rectifying unit 17 has a configuration in which four diodes are connected in a bridge shape.

The current control unit 11, the current detection unit 12, the DC side terminals 17 a and 17 b of the rectification unit 17, and the voltage compensation storage battery 14 are connected in series. More specifically, of the DC side terminals of the rectification unit 17, the positive output terminal 17 a is connected to the current detection unit 12 side, and the negative output terminal 17 b is connected to the positive terminal 14 a of the voltage compensation storage battery 14. Further, the AC side terminals 17c and 17d of the rectifying unit 17 are connected to the connection terminals 10a and 10b of the storage battery diagnostic device 10, respectively.
As described above, the positive terminal 14a of the voltage compensation storage battery 14 is connected to the negative output terminal 17b of the rectifying unit 17, and the negative terminal 14b is connected to the current control unit 11 side. Here, it is assumed that the voltage compensation storage battery 14 is charged with a voltage equal to or higher than the forward drop voltage generated when the diagnostic current flows through the rectifying unit 17 constituted by four diodes. .
In the rectifying unit 17, the diagnostic current flows in series with the two diodes. Therefore, the forward voltage drop is twice the value of the forward voltage drop per diode. As described above, the forward voltage drop generated by the diode is about 1.5 V for the silicon diode and about 0.6 V for the Schottky barrier diode, so the charging voltage of the voltage compensation storage battery 14 is 3 V or more. To do. Here, for example, about 4V.

FIG. 6 is a flowchart showing a diagnostic processing procedure executed by the main control unit 16. The main control unit 16 starts the diagnosis process when the storage battery diagnosis device 10 is turned on.
The diagnostic process shown in FIG. 6 is the same as the diagnostic process of FIG. 3 except that the processes of steps S4 to S6 are deleted in the above-described diagnostic process of FIG.
That is, when the main control unit 16 determines that the storage battery diagnostic device 10 is connected to the diagnosis storage battery 20 in step S3, the main control unit 16 proceeds to the step S7 as it is and preparations for starting diagnosis of the diagnosis storage battery 20 are completed. to decide. Thus, in this embodiment, after the storage battery diagnostic apparatus 10 is connected to the diagnostic storage battery 20, it is not necessary to perform a process of determining whether the terminal connection of the storage battery diagnostic apparatus 10 is normal.
As described above, in the present embodiment, the storage battery diagnostic device 10 includes the rectifying unit 17 including a bridge diode. Therefore, a voltage in a certain direction can be applied to the current control unit 11 regardless of the polarity when the storage battery diagnostic device 10 is connected to the diagnosis storage battery 20. Therefore, it is possible to reliably prevent an abnormal current from flowing through the current control unit 11 when the storage battery diagnostic device 10 is reversely connected.

The storage battery diagnostic device 10 also includes a voltage compensation storage battery 14 that compensates for a forward voltage drop generated by two diodes through which a diagnostic current flows among the four diodes constituting the rectifying unit 17. Therefore, even if the voltage applied to the current control unit 11 decreases by about 1.2 V to 3.0 V, which is the forward voltage drop of the two diodes of the rectifying unit 17, the voltage compensation storage battery 14 is charged. A voltage of about 4 V, which is a voltage component, is a compensated value, and as a result, a voltage sufficient to control the current by the current control unit 11 can be secured.
Therefore, for example, even when the terminal voltage of the diagnostic storage battery 20 is low, the current control unit 11 can be appropriately controlled, and the discharge current can be supplied up to the set diagnostic current value Ia. Therefore, the diagnosis storage battery 20 can be diagnosed with high accuracy.

  In addition, since the rectification unit 17 composed of a bridge diode is provided so that the diagnostic current can always flow only in a certain direction, the current control unit 11 is configured by one MOSFET, for example, as shown in FIG. It becomes possible to do. That is, in order to enable diagnosis even when the storage battery diagnostic device 10 is reversely connected, the current control unit does not need to be configured to have two MOSFETs connected in reverse series. Therefore, in the present embodiment, the number of semiconductor elements constituting the current control unit can be reduced, and the drive circuit of the current control unit can be simplified correspondingly, and the apparatus can be downsized.

(Modification)
In the first embodiment, the voltage compensation storage battery 14 has been described with respect to the case where the positive electrode terminal 14a is connected to the rectifying unit 13 side and the negative electrode terminal 14b is connected to the connection terminal 10a side. May be connected to the closed circuit A in series. For example, as shown in FIG. 7, the positive electrode terminal 14a is connected to the connection terminal 10b side and the negative electrode terminal 14b is connected to the current control unit 11 side. Either is acceptable. In addition, when the reference potentials of the current control unit 11 and the main control unit 16 are different depending on the position of the voltage compensation unit, it is preferable to take measures to increase the measurement accuracy. For example, in the case of the example of FIG. 7, the voltage detection unit 15 or the like detects the voltage between the negative terminal 22 of the diagnostic storage battery 20 and the negative terminal 14 b of the voltage compensation storage battery 14 to detect the voltage of the voltage compensation storage battery 14. It is conceivable to correct the influence, or to insulate with a photocoupler or the like so as to separate the reference potentials of the current control unit 11 and the main control unit 16.

Similarly, in the second embodiment, the positive electrode terminal 14a of the voltage compensation storage battery 14 is connected to the negative output terminal 17b of the rectification unit 17, and the negative electrode terminal 14b of the voltage compensation storage battery 14 is connected to the current control unit 11 side. However, the position where the voltage compensator is connected is not limited to this.
1, 5, and 7, an example in which the diagnostic storage battery 20 is connected to the other storage batteries 20-1 and 20-2 is illustrated. For example, as illustrated in FIG. Of course, measurement is possible even when it exists alone.

In each of the above-described embodiments, the case where the voltage compensation storage battery 14 is used as the voltage compensation unit that compensates for the forward voltage drop when a diagnostic current flows through the diode constituting the rectification unit has been described. However, the voltage compensator in the present application is not limited to a storage battery as long as it is a means capable of compensating for a forward voltage drop. For example, an electric double layer capacitor called an ultracapacitor or a supercapacitor, or a storage battery and an electric double layer A parallel circuit with a capacitor, a charging circuit, or the like can also be used.
The voltage compensation unit represented by the voltage compensation storage battery 14 may be in a state where the configuration having the function of the voltage compensation unit is electrically connected, and is built in the storage battery diagnostic device 10 and integrated. It does not have to be a structured appearance. For example, the voltage compensation unit is connected to the outside and the circuit is connected by a lead wire, or the voltage value to be compensated from a constituent part that is electrically connected by a transformer, an electromagnetic induction coil, etc., but is physically contacted Or may be configured to supply power. With this configuration, even when it is difficult to reduce the size of the voltage compensator, the voltage compensator can be handled separately, which not only facilitates loading and unloading of the measuring instrument, but also the storage battery to be diagnosed. The scale of the capacity of the voltage compensation storage battery 14 can be easily changed in accordance with the capacity of 20, and the versatility is enhanced.

  In each of the above embodiments, the voltage compensated by the voltage compensator is equal to the forward voltage drop so that at least the forward voltage drop when a diagnostic current flows through the diode constituting the rectifier can be compensated. An example in which a voltage value higher than that is set has been described. However, more preferably, during discharge, the voltage drop due to the circuit resistance of the storage battery diagnosis device or between the storage battery diagnosis device and the diagnosis storage battery is calculated from the sum of the voltage between the terminals of the diagnosis storage battery 20 and the voltage VBt compensated by the voltage compensation unit 14. A storage battery diagnosis and measurement apparatus comprising a voltage compensation unit that compensates the voltage so that a value obtained by subtracting a voltage drop due to the connection line is equal to or higher than the minimum voltage V11min that enables the current control unit 11 to operate; To do.

This will be described more specifically with reference to FIG. In FIG. 8, parts having the same configuration as that of the storage battery diagnosis device 10 of FIG.
The storage battery diagnosis device 10 includes a current control unit 11, a current detection unit 12, a rectification unit 13, a voltage compensation storage battery 14, a voltage detection unit 15, and a main control unit 16.
The storage battery diagnostic device 10 connects the connection terminal 10a to the positive electrode terminal 21 of the diagnosis storage battery 20 by the probe unit 31, and connects the connection terminal 10b to the negative electrode terminal 22 of the diagnosis storage battery 20 by the probe unit 32, thereby closed circuit A. Form. The current control unit 11, the current detection unit 12, the rectification unit 13, and the voltage compensation storage battery 14 are connected to the closed circuit A in series.
Further, the voltage detection unit 15 is connected in parallel to the closed circuit A by connecting the connection terminal 10c to the positive terminal 21 of the diagnostic storage battery 20 and connecting the connection terminal 10d to the negative terminal 22 of the diagnostic storage battery 20. The

here,
The terminal voltage of the diagnostic storage battery 20 is V20,
A voltage compensated by the voltage compensation storage battery 14 corresponding to the voltage compensation unit (a voltage between the positive terminal 14a and the negative terminal 14b) is expressed as VBt,
The voltage drop of the probe unit 31 that connects the connection terminal 10a of the storage battery diagnostic device 10 and the positive terminal 21 of the diagnosis storage battery 20 when the diagnostic current value Ia is discharged is Vp,
The voltage drop of the probe part 32 that connects the connection terminal 10b of the storage battery diagnostic device 10 and the negative electrode terminal 22 of the diagnosis storage battery 20 when the diagnostic current value Ia is discharged is Vn,
As a voltage drop due to electrical resistance existing in the circuit of the storage battery diagnostic measuring device when the diagnostic current value Ia is discharged, between the connection terminal 10a of the storage battery diagnostic device 10 and the negative electrode terminal 14b of the voltage compensating storage battery 14 The sum of the voltage drop between the positive electrode terminal 14a of the voltage compensation storage battery 14 and the terminal 11a of the current control unit 11 and between the terminal 11b of the current control unit 11 and the terminal of the connection terminal 10b of the storage battery diagnostic device 10 is Val. ,
The voltage between the terminals 11a and 11b of the current control unit 11 when the diagnostic current value Ia is discharged is V11,
When
The voltage of the closed circuit A is expressed by equation (1) (Kirchhoff's second law).
V20−Vp + VBt−Vall−V11−Vn = 0 (1)

When the equation (1) is modified, the voltage V11 between the terminals of the current control unit 11 is expressed by the equation (2).
V11 = V20 + VBt−Vall−Vp−Vn (2)
Here, if the minimum voltage required for the current control unit 11 to operate is V11min,
V11min ≦ V20 + VBt−Vall−Vp−Vn (3)
If the voltage VBt compensated by the voltage compensator is set so that the current discharged from the diagnostic storage battery 20 can be controlled by the current controller 11.

At the time of diagnosis, the terminal voltage V20 of the diagnosis storage battery 20 decreases as shown in FIG. In order to complete the diagnosis, even when the terminal voltage V20 of the diagnosis storage battery becomes the terminal voltage Va of the diagnosis storage battery immediately before the end of discharge, the current control unit 11 operates with the voltage V11 between the terminals of the current control unit 11. Therefore, it is necessary to set the voltage VBt to be compensated by the voltage compensator so as to be equal to or higher than the minimum voltage V11min necessary for the operation.
That is, when the diagnostic current value Ia is discharged, V11min ≦ Va + VBt−Vall−Vp−Vn (4)
What is necessary is just to provide the voltage compensation part which compensates the voltage VBt which satisfy | fills.
In addition, when the equation (4) is modified, the following equation (5) is obtained.
Va + VBt ≧ Vall + Vp + Vn + V11min (5)
That is, depending on the magnitudes of V11 (V11min) and V20 (Va) that can be taken between the start of discharge and immediately before the end of discharge, the compensation voltage VBt is less than the forward drop voltage of the diode that constitutes the rectifying unit in Vall. It can be understood that (5) is satisfied even with a slightly lower value. In this specification and claims, “equivalent” includes a value slightly lower than the forward drop voltage of the diode, which can be taken by the compensation voltage VBt.

If the voltage compensation unit that compensates the voltage VBt that satisfies the condition shown in the equation (4) is provided, the current control unit 11 can be appropriately controlled even when the terminal voltage V20 of the diagnostic storage battery 20 is low. The discharge current can be made to flow up to the set diagnostic current value Ia. Therefore, the diagnosis storage battery 20 can be diagnosed with high accuracy.
Further, the voltage compensator can compensate not only for the forward drop voltage of the diode when the discharge current Ia flows, but also for the voltage drop due to the electric resistance existing in the circuit of the storage battery diagnostic measuring device. The connection line between the connection terminal 10a of the storage battery diagnostic device 10 to the terminal of the negative electrode terminal 14b of the voltage compensation storage battery 14 and the connection line between the terminal 11b of the current control unit 11 to the connection terminal 10b of the storage battery diagnosis device 10 in FIG. Even if the electrical resistance is increased by making it thinner, for example, a large voltage drop occurs, a voltage necessary for control can be applied to the current control unit 11. Therefore, it is possible to appropriately supply a current necessary for diagnosis, and it is possible to perform highly accurate measurement, and it is possible to reduce the size and weight of the apparatus.

  Similarly, the voltage compensation unit can also compensate for Vp and Vn which are voltage drops of the probe units 31 and 32 that connect the storage battery diagnostic measuring device 14 and the diagnostic storage battery 20, for example, the conductor wire of the probe part. By reducing or increasing the diameter of the probe, the resistance value of the probe unit increases, and even when a large voltage drop occurs, a voltage necessary for control can be applied to the current control unit 11. . As a result, a current necessary for diagnosis can be appropriately supplied, and not only high-precision measurement can be performed, but also the probe operated by the operator at the time of diagnosis can be reduced in size and weight.

  If there is no compensation for the voltage drop of the probe part by the voltage compensation part, in order to reduce the voltage drop of the probe part, use a thick and heavy conductor wire, and configure the probe part as short as possible There was a need. For this reason, the measurement worker had to hold the measuring device for diagnosing the storage battery, and had to move the probe portion with poor operability because it was thick, hard and heavy, and measured. If the voltage compensator compensates for the voltage drop of the probe part, the probe part can be lengthened, so the storage battery diagnostic measuring device can be placed on the floor or at a location away from the diagnostic storage battery It becomes like this. In addition, it is not necessary for the worker to measure in the form of holding the storage battery diagnostic measuring device. Although there are many small measurement locations, it is not necessary to carry the entire storage battery diagnostic measurement device to the measurement location, and only the probe part connecting the storage battery diagnostic measurement device and the diagnostic storage battery is carried to the work location. Therefore, workability is dramatically improved and the physical burden on the operator is reduced.

  In addition, although demonstrated using FIG. 8, the idea is the same also when the electrical storage diagnostic apparatus 10 is provided with the rectification | straightening part 17 which has the structure which connected four diodes as shown in FIG. That is, as the voltage drop due to the electrical resistance existing in the circuit of the storage battery diagnostic measuring device when the diagnostic current value Ia is discharged, the current detection unit 12 side of the current control unit 11 from the connection terminal 10a of the storage battery diagnostic device 10 Connection between the terminals of the current control unit 11 and the negative terminal 14b of the voltage compensation storage battery 14 and from the positive terminal 14a of the voltage compensation storage battery 14 to the storage battery diagnostic device 10. The sum of the voltage drop between the terminals of the terminal 10b is set to Vall, and the voltage to be compensated by the voltage compensation storage battery 14 corresponding to the voltage compensation unit 14 corresponding to the terminal voltage of the diagnosis storage battery 20 is V20 in the same manner as described above (positive terminal) 14a and the negative terminal 14b) is VBt and the diagnostic current value Ia is discharged, the connection terminal 10a of the storage battery diagnostic device 10 and the diagnostic storage battery 20 The voltage drop of the probe unit connecting the positive electrode terminal 21 is Vp, and the probe unit connecting the connection terminal 10b of the storage battery diagnostic device 10 and the negative electrode terminal 22 of the diagnostic storage battery 20 when the diagnostic current value Ia is discharged. The voltage drop may be Vn, and the voltage between the terminals of the current control unit 11 when the diagnostic current value Ia is discharged may be V11. Note that the voltage compensator is not limited to a storage battery as long as it can compensate the voltage VBt.

In each of the above embodiments, the case where the change in the terminal voltage is monitored both at the time of discharge and at the time of recovery after the end of the discharge has been described. However, if the change in the terminal voltage is monitored at least during the discharge, the diagnostic storage battery 20 Can be diagnosed. However, as in the above embodiments, it is preferable to monitor the change in the terminal voltage both at the time of discharge and at the time of recovery after the end of discharge because the deterioration of the diagnostic storage battery 20 can be diagnosed with high accuracy.
Furthermore, in each said embodiment, although the case where the process (step S14) which diagnoses degradation of the diagnostic storage battery 20 was included in the process performed by the main control part 16 was demonstrated, the main control part 16 of the diagnostic storage battery 20 is included. It is also possible to measure information (voltage detection value, current detection value) necessary for diagnosis and diagnose the diagnosis storage battery 20 with another device or the like. In this case, the storage battery diagnosis device 10 is a storage battery diagnosis measuring device that can appropriately measure information necessary for diagnosis of the diagnosis storage battery 20.

  DESCRIPTION OF SYMBOLS 10 ... Storage battery diagnostic apparatus (measurement apparatus for storage battery diagnosis), 11 ... Current control part, 12 ... Current detection part, 13 ... Rectification part, 14 ... Voltage compensation storage battery, 15 ... Voltage detection part, 16 ... Main control part, 17 Rectifier, 17a, 17b ... DC side terminal, 17c, 17d ... AC side terminal, 20 ... diagnostic storage battery, 21 ... positive terminal, 22 ... negative terminal, 20-1, 20-2 ... connected to diagnostic storage battery Storage battery, 31, 32 ... probe section

Claims (5)

A current controller connected between the terminals of the diagnostic storage battery and capable of controlling the current discharged from the diagnostic storage battery;
A voltage detector for detecting a terminal voltage of the diagnostic storage battery;
The current control unit is controlled to discharge a current necessary for diagnosis from the diagnosis storage battery for a predetermined time, and at least at the time of the discharge, the voltage detection unit detects the information necessary for diagnosis of the diagnosis storage battery. A main controller that measures changes in the terminal voltage of the diagnostic storage battery;
A rectifying unit including a diode and connected in series with the current control unit;
A voltage compensator connected in series with the rectifier,
The voltage compensator is
A storage battery diagnostic measuring apparatus comprising a voltage compensating storage battery charged with a voltage equal to or higher than a forward voltage drop of the diode.   The voltage compensation storage battery is charged with a voltage equal to or higher than a voltage that compensates for a voltage drop caused by a circuit resistance of the storage battery diagnostic measuring device including at least the forward drop voltage of the diode. The measuring apparatus for storage battery diagnosis according to claim 1. A current controller connected between the terminals of the diagnostic storage battery and capable of controlling the current discharged from the diagnostic storage battery;
A voltage detector for detecting a terminal voltage of the diagnostic storage battery;
The current control unit is controlled to discharge a current necessary for diagnosis from the diagnosis storage battery for a predetermined time, and at least at the time of the discharge, the voltage detection unit detects the information necessary for diagnosis of the diagnosis storage battery. A main controller that measures changes in the terminal voltage of the diagnostic storage battery;
A rectifying unit including a diode and connected in series with the current control unit;
A voltage compensator connected in series with the rectifier,
The voltage compensator is
It comprises an electric double layer capacitor charged with a voltage equal to or higher than the forward drop voltage of the diode, or a voltage compensation circuit in which the electric double layer capacitor and a voltage compensating storage battery are connected in parallel. A storage battery diagnostic measuring device.   4. The storage battery diagnostic measuring device according to claim 1, wherein the voltage compensation unit compensates the voltage without performing constant voltage control. 5. When a diagnostic current necessary for diagnosis is discharged from the diagnosis storage battery including a diode through a rectifying unit for a predetermined time, the battery is charged with a voltage equal to or higher than the forward voltage drop generated in the rectifying unit. The diagnostic current is discharged while compensating for the forward drop voltage by the voltage compensating storage battery,
A measurement method for storage battery diagnosis, comprising measuring a change in terminal voltage of the diagnosis storage battery as information necessary for diagnosis of the diagnosis storage battery at least during the discharge.

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