JP7573848B2 - Charge/Discharge Test System - Google Patents

Description

The present invention relates to a charge/discharge test system, for example, a charge/discharge test system that tests secondary batteries such as lithium ion batteries by charging and discharging them.

Conventionally, in performance evaluation tests of secondary batteries, a charge/discharge test system has been used that controls the charge/discharge of the secondary battery and measures the characteristic values of the secondary battery, such as the current value (see, for example, Patent Document 1).

JP 2016-205983 A

For example, when a charge/discharge test is performed by controlling the charging/discharging of each of a number of secondary batteries, the voltage value applied to the secondary battery, the current value flowing through the secondary battery, and the temperature value of the secondary battery are used as measured values to monitor whether there is an abnormality in each of the secondary batteries. In conventional test equipment, a sensor for measuring each of these values is attached to each of a number of secondary batteries, and the analog signal from each of the sensors is monitored using one dynamic strain gauge.

For example, when multiple secondary batteries are divided into multiple groups and charge/discharge tests are performed under different conditions for each group, if an abnormality occurs in some of the secondary batteries in the same group that are being tested under the same conditions, there is a high probability that an abnormality will also occur in the other batteries. Therefore, it is preferable to stop charging and discharging not only the secondary battery with the abnormality, but also the other batteries in the same group.

In addition, if an abnormality such as excessive heat occurs in one of the multiple secondary batteries, the other secondary batteries arranged spatially close to the secondary battery where the abnormality occurred will be heated, and if charging and discharging is continued, there is a high possibility that an abnormality will also occur in the other secondary batteries. Therefore, it is preferable to stop charging and discharging the secondary batteries arranged spatially close to the secondary battery where the abnormality occurred.

However, conventional monitoring using dynamic strain gauges can only perform simple abnormality monitoring, which issues an alert signal if the measured value obtained from the acquired analog signal deviates from the value preset for each dynamic strain gauge. As a result, the only options were to stop only the battery in which an abnormality occurred, or to stop the charge/discharge control of all batteries. In other words, it was difficult to perform abnormality monitoring in a flexible manner, such as stopping the charge/discharge control of some batteries while taking into account the relationship of the battery in which an abnormality occurred. Therefore, if an abnormality occurs in some batteries, stopping the charge/discharge of batteries that are not affected by the abnormality will reduce the efficiency of the test.

The present invention has been made in consideration of the above points, and one of its objectives is to provide a charge/discharge test system that can flexibly and efficiently monitor abnormalities during charge/discharge tests on multiple secondary batteries.

The charge/discharge test system according to the present invention includes a charge/discharge test device including a charge/discharge control unit that performs charge/discharge control on a plurality of secondary batteries in a charge/discharge mode determined for each of a plurality of battery groups including a plurality of secondary batteries, and that performs a charge/discharge test on the plurality of secondary batteries that are being subjected to charge/discharge control ; a measurement acquisition unit that acquires measurement values related to the states of each of the plurality of secondary batteries, a determination unit that determines whether each of the plurality of secondary batteries is an abnormal secondary battery for which charging/discharging should be stopped based on the measurement values, and a monitoring device having a stop request transmission unit that, while a charge/discharge test is being performed on the plurality of secondary battery groups by the charge/discharge test device, transmits a stop request signal requesting the stop of charging/discharging to a secondary battery included in the secondary battery group including the abnormal secondary battery and to another secondary battery group other than the one secondary battery group that is being subjected to the same charge/discharge test as the one secondary battery group including the abnormal secondary battery, and when the charge/discharge control unit receives the stop request signal, it stops charging/discharging of the secondary battery that is the subject of the stop request, and continues the charge/discharge tests on secondary battery groups other than the one secondary battery group and the other battery group.

With this configuration, if an abnormality (voltage, current, or temperature abnormality) occurs in at least one secondary battery during charging or discharging, it is determined that there is a high probability that there is a problem with the method of charge/discharge testing performed on the battery group to which that secondary battery belongs, and the charge/discharge test is stopped only for that battery group. In other words, while charging/discharging is stopped for the battery group that contains the abnormal battery, charging/discharging is continued for other battery groups that do not contain the abnormal battery. This makes it possible to prevent damage to the batteries or charge/discharge test equipment due to abnormalities in the secondary batteries during charging/discharging, while suppressing a decrease in the efficiency of the charge/discharge test.

1 is a block diagram showing a configuration of a charge/discharge test system according to the present invention; 11 is a flowchart illustrating an example of a battery monitoring process flow. FIG. 11 is a diagram showing an example of an abnormality determination condition designated and set for each battery. 10 is a time chart showing an example of a method for determining whether a voltage abnormality occurs in battery B1. 13 is a time chart showing another example of a method for determining whether or not a voltage abnormality has occurred in battery B1. 13 is a time chart showing yet another example of a method for determining whether or not a voltage abnormality has occurred in battery B1. FIG. 1 is a diagram showing an example of a battery connection configuration in a charge/discharge test system 100 when a charge/discharge test is performed on a plurality of batteries connected to each other as one battery group. 1 is a diagram showing an example of an arrangement of output amplifiers A1 to An arranged on a board of a charge/discharge test device 10. FIG.

The charge/discharge test system according to the present invention will be described below with reference to the drawings.

Figure 1 is a block diagram showing the configuration of a charge/discharge test system 100. Note that Figure 1 shows the connection configuration when testing batteries B1 to Bn (n is an integer equal to or greater than 1), each of which is a secondary battery.

As shown in FIG. 1, the charge/discharge test system 100 includes a charge/discharge test device 10, a measurement value acquisition unit 20, a controller 30, a display unit 40, and an input/output unit 50.

The charge/discharge test device 10 performs a charge/discharge test on the batteries B1 to Bn by charging and discharging the batteries B1 to Bn in various charge/discharge modes, such as a constant voltage mode, a constant current mode, a constant power mode, a pulse charge mode, or a constant resistance mode. This charge/discharge test may be performed on any one of the batteries B1 to Bn alone, or may be performed on multiple batteries or all of the batteries B1 to Bn simultaneously.

The charge/discharge test device 10 can test the batteries B1 to Bn by different charge/discharge test methods for each group. In the example shown in FIG. 1, the charge/discharge test device 10 performs different charge/discharge tests for each battery group consisting of battery group GP1 to which batteries B1 to Bm (m is an integer less than n and equal to or greater than 2) belong, battery group GP2 to which batteries Bm+1 to Br (r is an integer less than n and greater than m) belong, and battery group GP3 to which batteries Br+1 to Bn belong. In other words, the charge/discharge test device 10 controls the batteries belonging to each battery group GP1 to GP3 to be charged and discharged in different charge/discharge modes.

When the charge/discharge test device 10 receives a charge/discharge stop request signal ALM, it stops the charge/discharge test on the battery group that belongs to the battery group GP indicated by the charge/discharge stop request signal ALM among the battery groups GP1 to GP3.

The measurement value acquisition unit 20 includes sensor units C1 to Cn and AD input units U1 to Un.

The sensor units C1 to Cn are individually connected to the positive and negative terminals of the batteries B1 to Bn. The sensor units C1 to Cn detect the voltage occurring between the positive and negative terminals of the batteries B1 to Bn, and supply a voltage detection signal V representing the voltage value to the AD input units U1 to Un. The sensor units C1 to Cn also detect the current flowing between the positive and negative terminals of the batteries B1 to Bn, and supply a current detection signal I representing the current value to the AD input units U1 to Un. Furthermore, the sensor units C1 to Cn detect the temperature of or near the surface of the batteries B1 to Bn (hereinafter also referred to as the battery temperature), and supply a temperature detection signal T representing the battery temperature to the AD input units U1 to Un.

Each of the AD input units U1 to Un converts the analog voltage detection signal V, current detection signal I, and temperature detection signal T that it receives into digital data, and generates battery measurement data that represents each of them as a digital value. The AD input units U1 to Un send the battery measurement data that they generate to the transmission bus BS as battery measurement data MD1 to MDn.

With this configuration, the measurement value acquisition unit 20 measures the voltage, current, and battery temperature of each of the batteries B1 to Bn individually, obtains battery measurement data MD1 to MDn that individually represent the voltage, current, and battery temperature for each of the batteries B1 to Bn, and transmits them to the transmission bus BS.

The controller 30 is configured, for example, by a programmable logic controller (PLC) and executes battery monitoring processing in accordance with the battery monitoring flow shown in FIG. 2.

In FIG. 2, first, the controller 30 retrieves the battery measurement data MD1 to MDn from the transmission bus BS (step S11).

Next, the controller 30 generates a battery monitoring image signal that represents the state of each of the batteries B1 to Bn, i.e., the voltage, current, and battery temperature, in a time series manner using text, graphs, figures, etc., based on the captured battery measurement data MD1 to MDn (step S12).

Next, the controller 30 judges whether or not there is an abnormality in each of the batteries B1 to Bn based on the battery measurement data MD1 to MDn (step S13). Note that the conditions for judging whether or not there is an abnormality in each of the batteries B1 to Bn are preset in the controller 30 by the abnormality judgment condition designation signal CT supplied from the display unit 40.

Next, the controller 30 determines whether any of the batteries B1 to Bn has an abnormality (hereinafter also referred to as an abnormal battery) (step S14).

If it is determined in step S14 that no abnormal battery is present among the batteries B1 to Bn, the controller 30 supplies the battery monitoring image signal described above to the display unit 40 as a video signal VD (step S15). Note that when supplying the video signal VD to the display unit 40, the controller 30 may supply the video signal VD to the display unit 40 via a USB (Universal Serial Bus) or a wired or wireless LAN (Local Area Network).

By executing step S15, the display unit 40 displays on its display screen a battery monitoring image based on the video signal VD, that is, an image showing the measured values (voltage, current, temperature) corresponding to each of the batteries B1 to Bn in chronological order, as well as historical information, etc.

On the other hand, if it is determined in step S14 that an abnormal battery is present, the controller 30 sends a stop request signal RQ to the transmission bus BS to prompt the battery group containing the abnormal battery among the battery groups GP1 to GP3 to stop the charge/discharge test (step S16). After executing step S16, the controller 30 supplies the display unit 40 with a video signal VD containing an abnormality notification image that notifies the battery group containing the abnormal battery that an abnormality has occurred and that the charge/discharge test has been stopped (step S17).

By executing step S17, the display unit 40 displays on its display screen, together with the battery monitoring image described above, an abnormality notification image notifying the user that an abnormal battery is present and that a request to stop the charge/discharge test has been made.

Next, the controller 30 stores history information indicating the abnormal battery detection history described above in a non-volatile memory built into the controller 30 (step S18). After executing step S18 or step S15, the controller 30 again executes the series of processes in steps S11 to S18 described above.

Incidentally, the display unit 40 is formed with a touch panel (not shown) that accepts operations from the user so as to cover the display screen. The display unit 40 can change the form of the battery monitoring image displayed on the display screen in response to the user's pressing operation on the touch panel. For example, the display unit 40 can change the selection of the battery to be displayed as the battery monitoring image, the selection of the contents (voltage, current, temperature) to be displayed for each battery, the order of the contents, and the display form (graph display, numerical display, etc.) in response to the pressing operation on the touch panel. Furthermore, the touch panel receives an operation to specify an abnormality determination condition for determining an abnormality in the battery, and supplies a signal representing the specified abnormality determination condition to the controller 30 as the abnormality determination condition specification signal CT described above.

When a stop request signal RQ is sent to the transmission bus BS, the input/output unit 50 takes in the stop request signal RQ. The input/output unit 50 then supplies the charge/discharge test device 10 with a charge/discharge stop request signal ALM that stops the charge/discharge test for the battery group GP indicated by the stop request signal RQ, among the battery groups GP1 to GP3 that divide the batteries B1 to Bn.

With the above-mentioned configuration, the charge/discharge test system 100 can centrally monitor the state (voltage, current, battery temperature) of each of the multiple batteries being tested during the charge/discharge test on a single display unit 40. Furthermore, if an abnormality occurs in a battery during the charge/discharge test that could damage the battery or the test equipment, the charge/discharge test system 100 selectively stops the charge/discharge test for the battery group that is being subjected to the same charge/discharge test as that battery.

The detailed operation of this battery monitoring process is explained below.

First, the user operates the touch panel of the display unit 40 to specify the abnormality determination conditions for each of the batteries B1 to Bn to be tested.

For example, as shown in FIG. 3, the user specifies the upper and lower limits of the allowable voltage and allowable current between the positive and negative terminals, and the upper and lower limits of the allowable temperature as the battery temperature, as abnormality determination conditions for each of the batteries B1 to Bn. As a result, the abnormality determination conditions as shown in FIG. 3 are set in the controller 30 for each of the batteries B1 to Bn to be tested. For example, for battery B1, the upper limit VU1 and lower limit VL1 of the allowable voltage, the upper limit IU1 and lower limit IL1 of the allowable current, and the upper limit TU1 and lower limit TL1 of the allowable temperature are set in the controller 30.

After setting the abnormality determination conditions, the controller 30 determines whether each of the batteries B1 to Bn has a voltage abnormality relative to the allowable voltage, a current abnormality relative to the allowable current, and a temperature abnormality relative to the allowable temperature, as shown in FIG. 3 (S13).

Below, we will select battery B1 from batteries B1 to Bn and explain the detailed determination operation as an example of the operation to determine whether or not there is a voltage abnormality with respect to the allowable voltage for battery B1.

Figure 4 is a time chart showing an example of the judgment operation (first judgment mode) when judging a voltage abnormality of battery B1. At this time, if the sample value (shown by a white circle) of the voltage detection signal indicated in the battery measurement data MD1 acquired from battery B1, i.e., the voltage value of battery B1, is within the allowable voltage range of battery B1 (upper limit value VU1 to lower limit value VL1), the controller 30 judges that there is an "abnormality." On the other hand, if the sample value of the voltage detection signal, i.e., the voltage value of battery B1, is outside the allowable voltage range, the controller 30 judges that there is an "abnormality."

Figure 5 is a time chart showing another example (second judgment mode) of the judgment operation when judging a voltage abnormality of battery B1. In this case, if the accumulated number of times since the start of the charge/discharge test that the sample value (shown by a white circle) of the voltage detection signal shown in the battery measurement data MD1, i.e., the voltage value of battery B1, falls outside the allowable voltage range (upper limit VU1 to lower limit VL1), is less than a predetermined specified number, for example, five times, the controller 30 judges that there is "no abnormality." On the other hand, if the accumulated number is five or more times, the controller 30 judges that there is "an abnormality."

Figure 6 is a time chart showing yet another example (third judgment mode) of the judgment operation when judging a voltage abnormality of battery B1. In this case, if the number of consecutive times that the sample value (shown by a white circle) of the voltage detection signal shown in the battery measurement data MD1, i.e., the voltage value of battery B1 falls outside the allowable voltage range (upper limit value VU1 to lower limit value VL1), is less than a predetermined specified number of times, for example, three times, the controller 30 judges that there is an "abnormality." On the other hand, if the consecutive number of times is three or more, the controller 30 judges that there is an "abnormality."

As shown in Figures 4 to 6, the controller 30 issues a stop request (RQ) to the battery group GP1 to which the battery B1 belongs, to stop the charge/discharge test while the "abnormal" judgment result is obtained. In response to this stop request, the charge/discharge test device 10 stops the charge/discharge test on the batteries B1 to Bm that belong to the battery group GP1.

In addition to the above-mentioned abnormality determination for the allowable voltage, the controller 30 also performs the same abnormality determination for the allowable current and allowable temperature set for each battery as shown in FIG. 3, using the method shown in FIG. 4, FIG. 5, or FIG. 6.

In the above embodiment, when the controller 30 obtains a judgment result of "abnormality" for one of the batteries B1 to Bn (e.g., B1), it stops the charge/discharge test for the battery group GP to which that battery belongs.

However, the controller 30 may be configured to stop the charge/discharge test for a battery group GP if a predetermined number or more batteries in the same battery group are determined to have an abnormality.

In addition, in the above embodiment, the controller 30 stops the charge/discharge test if a determination result of "abnormality exists" is obtained for any one of the allowable voltage, allowable current, and allowable temperature.

However, the controller 30 may stop the charge/discharge test when an "abnormal" judgment result is obtained for at least two of the allowable voltage, allowable current, and allowable temperature. For example, the controller 30 validates the judgment result for the allowable current only when an "abnormal" judgment result is obtained for the allowable temperature. In other words, when an "abnormal" judgment result is obtained for both the allowable temperature and the allowable current, the controller 30 stops the charge/discharge test for the battery group to which the battery corresponding to the judgment result belongs.

In addition, in the above embodiment, the controller 30 is configured as a PLC, but it is also possible to use a microcontroller or a hardware implementation of the functions of the controller 30 described above, such as an FPGA (Field Programmable Gate Array).

That is, the controller 30 may include the following judgment unit and stop request transmission unit. The judgment units (S11 to S14) judge whether each battery is an abnormal battery for which charging and discharging should be stopped based on the measured values (MD1 to MDn) obtained by individually measuring the states (voltage, current, temperature) of the multiple batteries (B1 to Bn). The stop request transmission unit (S16) transmits a stop request signal (RQ) to the charge and discharge test device (10) to stop charging and discharging the battery group (GP) that includes the abnormal battery. Note that a monitoring device that monitors the states of the batteries B1 to Bn during a charge and discharge test as described above may also include the measurement value acquisition unit 20 shown in FIG. 1 together with the judgment unit and stop request transmission unit.

The charge/discharge test device 10 may include a charge/discharge control unit for each battery group GP that controls the charging and discharging of the batteries belonging to each battery group GP in a charge/discharge mode that is predetermined for each battery group GP.

In short, the charge/discharge test system 100 may include the following charge/discharge test device and monitoring device:

That is, the charge/discharge test device (10) includes a charge/discharge control unit that performs charge/discharge control on a plurality of secondary batteries (B1 to Bn) in a charge/discharge mode determined for each of a plurality of battery groups (GP) each including one or more secondary batteries (B). The monitoring device (30) includes a measurement acquisition unit (20) that acquires measurement values (MD1 to MDn) related to the state of each of the plurality of secondary batteries (B1 to Bn). The monitoring device further includes a determination unit (S11 to S14) that determines whether each of the plurality of secondary batteries is an abnormal secondary battery in which charging/discharging should be stopped based on the measurement values, and a stop request transmission unit (S16) that transmits a stop request signal (RQ) requesting the stop of charging/discharging to each secondary battery included in the secondary battery group including the abnormal secondary battery. Here, when the charge/discharge control unit receives the stop request signal, it stops charging/discharging of the secondary battery that is the subject of the stop request.

With this configuration, if an abnormality (voltage, current, or temperature abnormality) occurs in at least one battery, the charge/discharge test system determines that there is a problem with the charge/discharge test method applied to the battery group to which that battery belongs. Then, the charge/discharge test is stopped only for that battery group. In other words, the charge/discharge test for the battery group that contains the abnormal battery is stopped, but the charge/discharge test for other battery groups that do not contain the abnormal battery is continued.

This makes it possible to prevent damage to the battery or charge/discharge test equipment due to battery abnormalities during charging/discharging, while minimizing any decline in the efficiency of charge/discharge testing.

In the charge/discharge test system 100 shown in FIG. 1, the batteries B1 to Bn to be tested may be connected to the charge/discharge test device 10 while housed in two or more battery cases. In this case, since the batteries are physically close to each other in each battery case, if an abnormality occurs in one battery and it generates high heat, the other batteries housed in the battery case may also heat up and be damaged all at once.

The charge/discharge test system 100 may also simultaneously perform charge/discharge tests on multiple battery units, each of which is made up of multiple batteries connected in series or parallel.

Figure 7 shows the connection configuration within the charge/discharge test system 100 when performing a charge/discharge test with a battery unit consisting of series-connected batteries B1 to Bm as battery group GP1, a battery unit consisting of series-connected batteries Bm+1 to Br as battery group GP2, and a battery unit consisting of series-connected batteries Br+1 to Bn as battery group GP3. In Figure 7, except for the manner in which batteries B1 to Bm are connected to the charge/discharge test device 10, the other configurations are the same as those shown in Figure 1.

In the battery unit (GP1 to GP3) shown in FIG. 7, the batteries B are electrically connected. If an abnormality occurs in one battery, causing an overcurrent that exceeds the allowable current to flow, this overcurrent may also flow into the other batteries in the battery unit, causing them to be damaged all at once.

In addition, in the charge/discharge test device 10 shown in FIG. 1, as shown in FIG. 8, for example, output amplifiers A1 to An connected to batteries B1 to Bn are arranged in parallel on the board SBS, and a pair of batteries and output amplifiers connected to each other form a single charge/discharge circuit. In this case, if an abnormality occurs in one battery and an excessive current flows, a large current also flows into the output amplifier connected to that battery, causing it to heat up. As a result, the output amplifier arranged adjacent to that output amplifier and the battery connected to that output amplifier are also affected and become highly heated.

In this way, if an abnormality occurs in one battery, other batteries located nearby in the circuit may be affected and damaged.

When the controller 30 detects an abnormal battery among the batteries B1 to Bn, it stops the charging and discharging operations of the abnormal battery as well as any batteries that are physically or circuitically located close to the abnormal battery.

In short, when a charge/discharge test is performed on batteries B1 to Bn in the manner shown in FIG. 7 or FIG. 8, the charge/discharge test system 100 may include the following charge/discharge test device and monitoring device.

That is, the charge/discharge test device (10) includes a charge/discharge control unit that performs charge/discharge control on multiple secondary batteries (B1 to Bn). The monitoring device (30) includes a measurement acquisition unit (20) that acquires measurement values (MD1 to MDn) related to the state of each of the multiple secondary batteries. The monitoring device further includes a determination unit (S11 to S14) that determines whether each of the multiple secondary batteries is an abnormal secondary battery for which charging/discharging should be stopped based on the measurement values, and a stop request transmission unit that transmits a stop request signal (RQ) to request the stopping of charging/discharging to the abnormal secondary battery and to secondary batteries that are located physically or circuit-wise close to the abnormal secondary battery. Here, when the charge/discharge control unit receives the stop request signal, it stops the charging/discharging of the secondary battery that is the subject of the stop request.

With this configuration, if an abnormality (abnormal voltage, current, or temperature) occurs in at least one secondary battery during charging or discharging, it is determined that there is a high probability that damage will occur to that secondary battery as well as to secondary batteries that are physically or circuit-wise located nearby the secondary battery. Then, the charge/discharge test of the abnormal battery as well as the secondary batteries that are physically or circuit-wise located nearby the abnormal battery is stopped. In other words, the charge/discharge test of the abnormal battery as well as the secondary batteries that are located nearby the abnormal battery is stopped, but the charge/discharge test of the other secondary batteries is continued. This makes it possible to prevent damage to the battery or the charge/discharge test device due to an abnormality in the secondary battery during charging or discharging, while suppressing a decrease in the efficiency of the charge/discharge test.

10 Charge/discharge test device 20 Measurement value acquisition unit 30 Controller 40 Display unit 100 Charge/discharge test system B1 to Bn Battery

Claims (7)

a charge/discharge test device including a charge/discharge control unit that performs charge/discharge control on a plurality of secondary batteries in a charge/discharge mode determined for each of a plurality of battery groups including a plurality of secondary batteries, and that performs a charge/discharge test on the plurality of secondary batteries that are subjected to the charge/discharge control ;
a measurement value acquiring unit that acquires a measurement value relating to a state of each of the plurality of secondary batteries;
a determination unit that determines whether or not each of the plurality of secondary batteries is an abnormal secondary battery in which charging/discharging should be stopped based on the measurement values;
and a monitoring device having a stop request transmission unit that transmits a stop request signal requesting the stop of charging and discharging to secondary batteries included in the secondary battery group including the abnormal secondary battery and to other secondary battery groups, different from the one secondary battery group including the abnormal secondary battery, that are being subjected to the same charge and discharge test as the one secondary battery group including the abnormal secondary battery, when a charge and discharge test is being performed on a plurality of secondary battery groups by the charge and discharge test device;
When the charge/discharge control unit receives the stop request signal, the charge/discharge control unit stops charging/discharging of the secondary battery that is the target of the stop request ;
The charge/discharge test for the one secondary battery group and the secondary battery groups other than the other battery group shall be continued.
A charge/discharge test system comprising: The charge/discharge test system according to claim 1, characterized in that the determination unit determines that a secondary battery corresponding to a measurement value that is outside a predetermined numerical range a predetermined number of times in succession among the multiple measurement values acquired by the measurement value acquisition unit from the multiple secondary batteries is an abnormal secondary battery. The charge/discharge test system according to claim 1, characterized in that the determination unit determines that a secondary battery corresponding to a measured value that is outside a predetermined numerical range more than a predetermined number of times among the multiple measured values acquired by the measurement value acquisition unit from the multiple secondary batteries is an abnormal secondary battery. 4. The charge/discharge test system according to claim 1, wherein the measured values are voltage values, current values, or temperatures of the plurality of secondary batteries. 5. The charge/discharge test system according to claim 1, wherein the monitoring device includes a programmable logic controller. 6. The charge/discharge test system according to claim 1, further comprising a display unit that displays a battery monitoring image representing the measured values respectively obtained from the plurality of secondary batteries. The charge/discharge test system according to claim 6, characterized in that when the determination unit determines that an abnormal secondary battery is present among the plurality of secondary batteries, the display unit displays, together with the battery monitoring image, an abnormality notification image notifying the user that an abnormal secondary battery is present and that a request has been made to stop the charge/discharge test.