Charge / discharge test system, charge / discharge test method, and program

Abstract

To provide a charge / discharge test system capable of enhancing a ratio of power sharing period to test period, a charge / discharge test method, and a program.SOLUTION: A charge / discharge test system 10 comprises a control device which controls, during charge / discharge test, a first bi-directional DC / DC converter 14 and a second bi-directional DC / DC converter 15 such that power sharing is performed between a test battery 11 and a non-test battery 12, and controls the operation of an AC / DC converter 13 according to excessive / deficient power in a direct current bus 16. The control device executes determination voltage acquisition processing for acquiring determination voltage which is voltage of the non-test battery 12, voltage determination processing for determining whether a forced condition set for the determination voltage is established, and forced processing for when the forced condition is established, controlling the second bi-directional DC / DC converter 15 such that the forced condition is not established to forcibly discharge or charge the non-test battery 12.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a charge / discharge test system, a charge / discharge test method, and a program for performing a charge / discharge test on a secondary battery. [Background technology]

[0002] In recent years, hybrid vehicles, plug-in hybrid vehicles, and electric vehicles have become increasingly popular. These vehicles are equipped with rechargeable secondary batteries as drive batteries. As a technology related to such drive batteries, for example, Patent Document 1 discloses a charge / discharge test system that tests drive batteries connected in parallel as test batteries. This charge / discharge test system tests the test battery while sharing power (energy) between the test battery and a non-test battery, which is a secondary battery not being tested. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2023-10581 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-described charge / discharge test system, the higher the proportion of the power sharing period in the test period, the more energy can be saved. Therefore, there is a demand for the charge / discharge test system to increase the proportion of the power sharing period in the test period. [Means for solving the problem]

[0005] A charge / discharge test system that solves the above problem includes a bidirectional AC / DC converter connected to an AC bus and a DC bus, a first bidirectional DC / DC converter connected to the DC bus and a test battery (a secondary battery to be tested), a second bidirectional DC / DC converter connected to the DC bus and a non-test battery (a secondary battery not to be tested), and a control device that controls operation of the first bidirectional DC / DC converter and the second bidirectional DC / DC converter so that power is shared between the test battery and the non-test battery via the DC bus during the charge / discharge test, and controls operation of the bidirectional AC / DC converter according to a power surplus or shortage on the DC bus. The control device executes a voltage acquisition process that acquires a reference voltage, which is the voltage of the non-test battery, a voltage determination process that determines whether a forcing condition set for the reference voltage is met, and a forcing process that controls operation of the second bidirectional DC / DC converter so that the forcing condition is not met, thereby forcibly discharging or forcibly charging the non-test battery.

[0006] a first bidirectional DC / DC converter having one end connected to the DC bus and the other end connected to a test battery, which is a secondary battery that is the subject of the charge / discharge test; a second bidirectional DC / DC converter having one end connected to the DC bus and the other end connected to a non-test battery, which is a secondary battery that is not the subject of the charge / discharge test; and a control device that controls operation of the first bidirectional DC / DC converter and the second bidirectional DC / DC converter so that power is shared between the test battery and the non-test battery via the DC bus during the charge / discharge test, and controls operation of the bidirectional AC / DC converter in accordance with an excess or shortage of power on the DC bus, in which the control device obtains a reference voltage, which is the voltage of the non-test battery, and determines whether a compulsory condition set for the reference voltage is met; and if the compulsory condition is met, controls operation of the second bidirectional DC / DC converter to forcibly discharge or charge the non-test battery so that the compulsory condition is not met.

[0007] The program for solving the above problem includes a bidirectional AC / DC converter having one end connected to an AC bus and the other end connected to a DC bus, a first bidirectional DC / DC converter having one end connected to the DC bus and the other end connected to a test battery which is a secondary battery that is the subject of a charge / discharge test, and a second bidirectional DC / DC converter having one end connected to the DC bus and the other end connected to a non-test battery which is a secondary battery that is not the subject of the charge / discharge test, and a control circuit for controlling the first bidirectional DC / DC converter and the second bidirectional DC / DC converter so that power is shared between the test battery and the non-test battery via the DC bus during the charge / discharge test. a control device that controls the operation of a C / DC converter and also controls the operation of the bidirectional AC / DC converter in accordance with the excess or shortage of power in the DC bus, and causes the control device to execute a judgment voltage acquisition process that acquires a judgment voltage that is the voltage of the non-test battery; a voltage judgment process that judges whether a compulsory condition set for the judgment voltage is met; and a compulsory process that, when the compulsory condition is met, controls the operation of the second bidirectional DC / DC converter to forcibly discharge or forcibly charge the non-test battery so that the compulsory condition is not met. [Effects of the Invention]

[0008] According to the present invention, the proportion of the power sharing period in the test period can be increased. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram showing a schematic configuration of a charge / discharge test system in the first embodiment. [Figure 2] In the first embodiment, FIG. 2(a) is a diagram schematically showing an example of power sharing, and FIG. 2(b) is a diagram schematically showing another example of power sharing. [Figure 3] FIG. 3 is a flowchart showing an example of the forced boost process in the first embodiment. [Figure 4] FIG. 4 is a flowchart showing an example of the forced charging process in the first embodiment. [Figure 5] FIG. 5 is a flowchart showing an example of the forced discharge process in the first embodiment. [Figure 6] FIG. 6 is a graph showing an example of the transition of the determination voltage including the forced charging in the first embodiment. [Figure 7] FIG. 7 is a graph showing an example of the transition of the determination voltage including the forced discharge in the first embodiment. [Figure 8] FIG. 8 is a flowchart showing an example of the forced boost process in the second embodiment. [Figure 9] FIG. 9 is a graph for explaining the lower limit side determination range and the upper limit side determination range in the second embodiment. [Figure 10] FIG. 10 is a graph for explaining the allowable decrease amount in the second embodiment. [Figure 11] FIG. 11 is a graph for explaining the allowable rise amount in the second embodiment. [Figure 12] FIG. 12 is a graph showing an example of a transition of the determination voltage due to the forced boost process in the second embodiment. [Figure 13] FIG. 13 is a graph showing an example of the transition of power supply to other facilities in the third embodiment. [Figure 14] FIG. 14 is a diagram showing a schematic configuration of a charge / discharge test system in the third embodiment. [Figure 15] FIG. 15 is a flowchart showing an example of the forced condition setting process in the third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] (First embodiment) A first embodiment of a charge / discharge test system, a charge / discharge test method, and a program will be described with reference to FIGS.

[0011] 1, charge / discharge test system 10 performs charge / discharge tests on test batteries 11-1, 11-2, ..., 11-m (m is an integer of 3 or greater) while sharing power (energy) between test batteries 11-1, 11-2, ..., 11-m and non-test batteries 12-1, 12-2, ..., 12-n (n is an integer of 3 or greater). Test batteries 11-1, 11-2, ..., 11-m and non-test batteries 12-1, 12-2, ..., 12-n are, for example, various secondary batteries such as lithium-ion batteries, nickel-metal hydride batteries, and all-solid-state batteries (as well as other devices capable of storing power, including large-capacity capacitors such as electric double layer batteries).

[0012] In the following description, when test batteries 11-1, 11-2, ..., 11-m are not distinguished, they will simply be referred to as test battery 11, and when non-test batteries 12-1, 12-2, ..., 12-n are not distinguished, they will simply be referred to as non-test batteries 12. Also, although the number of test batteries 11 and non-test batteries 12 is set to three or more, it is sufficient that the number of test batteries 11 and non-test batteries 12 is one or more.

[0013] The charge / discharge test system 10 is connected to an AC bus 3. The AC bus 3 is connected to an AC power source 4 as well as other equipment 5 in a facility such as a factory in which the charge / discharge test system 10 is installed. The AC bus 3 supplies AC power to the charge / discharge test system 10 and the other equipment 5.

[0014] The charge / discharge test system 10 includes a bidirectional AC / DC converter 13, first bidirectional DC / DC converters 14-1, 14-2, . . . , 14-m, second bidirectional DC / DC converters 15-1, 15-2, .

[0015] In the following, the bidirectional AC / DC converter 13 will be simply referred to as the AC / DC converter 13. When there is no need to distinguish between the first bidirectional DC / DC converters 14-1, 14-2, ..., 14-m, they will simply be referred to as the DC / DC converter 14. When there is no need to distinguish between the second bidirectional DC / DC converters 15-1, 15-2, ..., 15-n, they will simply be referred to as the DC / DC converter 15. In addition, in FIG. 1, the bidirectional AC / DC converter will be simply referred to as AC / DC, and the bidirectional DC / DC converter will be simply referred to as DC / DC.

[0016] (Bidirectional AC / DC converter) One end of the AC / DC converter 13 is connected to the AC bus 3. The other end of the AC / DC converter 13 is connected to the DC bus 16. The AC / DC converter 13 converts the AC power on the AC bus 3 into DC power and supplies it to the DC bus 16. The AC / DC converter 13 converts the DC power on the DC bus 16 into AC power and supplies it to the AC bus 3. The operation of the AC / DC converter 13 is controlled by the control device 20.

[0017] (First bidirectional DC / DC converter) One end of the DC / DC converter 14 is connected to the AC / DC converter 13 via a DC bus 16. The other end of the DC / DC converter 14 is connected to the test battery 11. The DC / DC converter 14 charges and discharges the test battery 11. The DC / DC converter 14 discharges the test battery 11 by outputting the power stored in the test battery 11 to the DC bus 16. The DC / DC converter 14 charges the test battery 11 by supplying the DC power on the DC bus 16 to the test battery 11. The operation of the DC / DC converter 14 is controlled by a control device 20. The DC / DC converter 14 also detects various pieces of information related to the test battery 11, such as the voltage of the test battery 11, the charging power during charging, and the discharging power during discharging. The DC / DC converter 14 outputs the detected various pieces of information about the test battery 11 to the control device 20.

[0018] (Second bidirectional DC / DC converter) One end of the DC / DC converter 15 is connected to the AC / DC converter 13 via a DC bus 16. The other end of the DC / DC converter 15 is connected to the non-test battery 12. The DC / DC converter 15 charges and discharges the non-test battery 12. The DC / DC converter 15 discharges the non-test battery 12 by outputting the power stored in the non-test battery 12 to the DC bus 16. The DC / DC converter 15 charges the non-test battery 12 by supplying the DC power on the DC bus 16 to the non-test battery 12. The operation of the DC / DC converter 15 is controlled by a control device 20. The DC / DC converter 15 also detects various information related to the non-test battery 12, including the voltage of the non-test battery 12, the charging power during charging, and the discharging power during discharging. The DC / DC converter 15 outputs the detected various information about the non-test battery 12 to the control device 20.

[0019] (Control device) The control device 20 may be realized, for example, by a hardware processor such as a CPU (Central Processing Unit) executing a program (software). Furthermore, some or all of these components may be realized by hardware (including circuitry) such as an LSI (Large Scale Integration), an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or a GPU (Graphics Processing Unit), or may be realized by a combination of software and hardware. The program may be stored in advance in a storage device (not shown) equipped with a non-transitory storage medium such as an HDD (Hard Disk Drive) or flash memory, which is included in the control device 20. The control device 20 may be realized, for example, by including a programmable logic controller (PLC).

[0020] The control device 20 executes a test process that controls the operation of the DC / DC converter 14 so that the test battery 11 is charged and discharged according to a preset test pattern. The control device 20 executes a power sharing process that controls the operation of the DC / DC converter 15 so that power is shared between the test battery 11 and the non-test battery 12 .

[0021] As shown in Figure 2(a), in the power sharing process, when the control device 20 controls the test battery 11 to be in a discharging state, it controls the DC / DC converter 15 so that the discharged power of the test battery 11 is supplied to the non-test batteries 12 via the DC bus 16. Also, as shown in Figure 2(b), when the control device 20 controls the test battery 11 to be in a charging state, it controls the DC / DC converter 15 so that the power stored in the non-test batteries 12 is supplied to the test battery 11 via the DC bus 16. Based on the input voltage of each non-test battery 12, the control device 20 controls the DC / DC converter 15 so that the voltage of each non-test battery 12 is uniform.

[0022] The control device 20 executes a supply / regeneration process that controls the operation of the AC / DC converter 13 based on the power surplus or deficiency in the DC bus 16. In the supply / regeneration process, when there is a power shortage in the DC bus 16, the control device 20 controls the AC / DC converter 13 so that the shortage of power is supplied to the DC bus 16. When there is surplus power in the DC bus 16, the control device 20 controls the AC / DC converter 13 so that the surplus power is regenerated to the AC bus 3.

[0023] The control device 20 repeatedly executes a forced boost process in parallel with the power sharing process. The forced boost process is a process that forcibly executes charging and discharging of the non-test battery 12 regardless of the charge / discharge state of the test battery 11. In the forced boost process, the control device 20 determines whether a forced condition that sets the voltage of the non-test battery 12 as the determination voltage Vj is met. When the forced condition is met, the control device 20 interrupts the power sharing process and controls the operation of the DC / DC converter 15 so that the forced condition is not met.

[0024] (Forced Boost Process) The forced boost process will be described with reference to FIGS. 3 to 5. During the test of the test battery 11, the control device 20 repeatedly executes the first forced boost process as the forced boost process. The first forced boost process is a process of forcibly charging and discharging the non-test battery 12 so that the capacity of the non-test battery 12 can be maximally utilized.

[0025] As shown in FIG. 3, in the first forced boost process, the control device 20 acquires the determination voltage Vj of the non-test battery 12 (determination voltage acquisition process: step S101). Next, the control device 20 compares the acquired determination voltage Vj with the forced charge voltage V1 and the forced discharge voltage V2 (voltage determination process: step S102). The forced charge voltage V1 is a value close to the lower limit voltage Vmin of use of the non-test battery 12, or the value of the lower limit voltage Vmin of use itself. The forced discharge voltage V2 is a value close to the upper limit voltage Vmax of use of the non-test battery 12, or the value of the upper limit voltage Vmax of use itself.

[0026] When the determination voltage Vj is greater than or equal to the forced charge voltage V1 and less than or equal to the forced discharge voltage V2, the control device 20 temporarily ends the first forced boost process (step S102: YES).

[0027] When the determination voltage Vj is lower than the forced charge voltage V1 (step S102: Vj < V1), the control device 20 interrupts the power sharing process and executes the forced charge process, which is one of the forced processes, assuming that the forced charge condition is satisfied (step S103). The forced charge process is a process of forcibly charging the non-test battery 12 that has been sufficiently discharged by the power sharing process, and is a process that is performed regardless of the charge and discharge state of the test battery 11. When the forced charge process ends, the control device 20 temporarily ends the first forced boost process.

[0028] On the other hand, when the determination voltage Vj is higher than the forced discharge voltage V2 (step S102: V2 < Vj), the control device 20 interrupts the power sharing process and executes a forced discharge process, which is one of the forced processes, assuming that the forced discharge condition is satisfied (step S104). The forced discharge process is a process of forcibly discharging the non-test battery 12 that has been sufficiently charged by the power sharing process, and is performed regardless of the charge and discharge state of the test battery 11. When the forced discharge process ends, the control device 20 temporarily ends the first forced boost process.

[0029] (Forced charging process) As shown in FIG. 4, in the forced charging process, the control device 20 controls the non-test battery 12 to a charged state by controlling the DC / DC converter 15 (step S201).

[0030] When the non-test battery 12 is controlled to a charged state, when the test battery 11 is in a charged state, the control device 20 controls the AC / DC converter 13 so that the total power of the charging power of the test battery 11 and the charging power of the non-test battery 12 is supplied to the DC bus 16. [[ID=!2]]

[0031] Also, when the test battery 11 is in a discharged state, its discharge power is supplied to the non-test battery 12 through the DC bus 16. When the discharge power of the test battery 11 is greater than the charging power of the non-test battery 12, the control device 20 controls the AC / DC converter 13 so that the surplus power in the DC bus 16 is regenerated to the AC bus 3. On the other hand, when the discharge power of the test battery 11 is less than the charging power of the non-test battery 12, the control device 20 controls the AC / DC converter / 3 so that the insufficient DC power is supplied to the DC bus 16.

[0032] Next, after the control device 20 obtains the determination voltage Vj of the non-test battery 12 (step S202), it determines whether the determination voltage Vj has reached the discharge start voltage V1d (step S203). The discharge start voltage V1d is a voltage lower than the forced discharge voltage V2.

[0033] If the determination voltage Vj has not reached the discharge start voltage V1d (step S203: NO), the control device 20 repeatedly executes steps S202 and S203. On the other hand, if the determination voltage Vj has reached the discharge start voltage V1d (step S203: YES), the control device 20 resumes the power sharing process (step S204) and ends the forced charging process.

[0034] (Forced discharge processing) As shown in FIG. 5, in the forced discharge process, the control device 20 controls the DC / DC converter 15 to put the non-test battery 12 into a discharge state (step S301).

[0035] When the non-test battery 12 is controlled to be in a discharging state, the control device 20 controls the AC / DC converter 13 so that when the test battery 11 is in a discharging state, the sum of the discharge power of the test battery 11 and the discharge power of the non-test battery 12 is regenerated to the AC bus 3.

[0036] Furthermore, when the test battery 11 is in a charging state, the discharge power of the non-test battery 12 is supplied to the non-test battery 12 via the DC bus 16. If the charge power of the test battery 11 is greater than the discharge power of the non-test battery 12, the control device 20 controls the AC / DC converter 13 so that the shortage of DC power is supplied to the DC bus 16. On the other hand, if the discharge power of the non-test battery 12 is less than the charge power of the test battery 11, the control device 20 controls the AC / DC converter 13 so that the surplus power on the DC bus 16 is regenerated and sent to the AC bus 3.

[0037] Next, the control device 20 acquires the reference voltage Vj of the non-test battery 12 (step S302), and then determines whether the reference voltage Vj has reached the charge start voltage V2c (step S303). The charge start voltage V2c is a voltage higher than the forced charge voltage V1.

[0038] When the determination voltage Vj has not reached the charge start voltage V2c (step S303: NO), the control device 20 repeatedly executes steps S302 and S303. On the other hand, when the determination voltage Vj has reached the charge start voltage V2c (step S303: YES), the control device 20 resumes the power sharing process (step S304) and ends the forced discharge process.

[0039] (Operation of the First Embodiment) As shown in FIG. 6, during the execution of the power sharing process, when the forced charge condition (Vj < V1) is satisfied, the control device 20 interrupts the power sharing process and forcibly charges the non-test battery 12. Then, when the determination voltage Vj reaches the discharge start voltage V1d, the control device 20 resumes the power sharing process.

[0040] Also, as shown in FIG. 7, during the execution of the power sharing process, when the forced discharge condition (V2 < Vj) is satisfied, the control device 20 interrupts the power sharing process and forcibly discharges the non-test battery 12. Then, when the determination voltage Vj reaches the discharge start voltage V1d, the control device 20 resumes the power sharing process.

[0041] The effects of the first embodiment will be described. (1-1) According to the charge and discharge test system 10, it is possible to reduce the state in which the non-test battery 12 is maintained at the upper limit voltage Vmax or the lower limit voltage Vmin of use. As a result, the capacity of the non-test battery 12 can be effectively utilized in performing power sharing between the test battery 11 and the non-test battery 12. As a result, since the ratio of the power sharing period during the test period increases, further energy saving of the charge and discharge test system can be achieved.

[0042] (1-2) In addition, it is possible to prevent the non-test battery 12 from being in an over-discharged state or an over-charged state. As a result, the life of the non-test battery 12 can be extended. (1-3) When the forced charging condition is met, the control device 20 maintains the non-test battery 12 in a charging state until the determination voltage Vj reaches the discharge start voltage V1d. Since the discharge start voltage V1d is lower than the forced discharge voltage V2, the test battery 11 can charge the non-test battery 12 even if the test battery 11 is in a discharging state when the power sharing process is resumed. As a result, the proportion of the power sharing period can be increased.

[0043] (1-4) When the forced discharge condition is met, the control device 20 maintains the non-test battery 12 in a discharged state until the determination voltage Vj reaches the charge start voltage V2c. Since the charge start voltage V2c is higher than the forced charge voltage V1, the non-test battery 12 can charge the test battery 11 even if the test battery 11 is in a charging state when the power sharing process is resumed. As a result, the proportion of the power sharing period can be increased.

[0044] (Second embodiment) A second embodiment of a charge / discharge test system, a charge / discharge test method, and a program will be described with reference to Figures 8 to 12. The charge / discharge test system, the charge / discharge test method, and the program of the second embodiment differ from the charge / discharge test system, the charge / discharge test method, and the program of the first embodiment only in the forced boost processing. Therefore, in the second embodiment, the forced boost processing will be described in detail, and the same parts as in the first embodiment will be denoted by the same reference numerals and detailed description thereof will be omitted.

[0045] In the second embodiment, the control device 20 repeatedly executes a second forced boost process as a forced boost process during testing of the test battery 11. The second forced boost process is a process that forcibly charges and discharges the non-test battery 12 so that the determination voltage Vj fluctuates between the lower usable voltage limit Vmin and the upper usable voltage limit Vmax while maintaining a balance.

[0046] As shown in FIG. 8, in the second forced boost process, the control device 20 acquires a determination voltage Vj (determination voltage acquisition process: step S401). Next, the control device 20 compares the determination voltage Vj with the lower limit threshold voltage V3 and the upper limit threshold voltage V4 (step S402: first voltage determination process).

[0047] As shown in FIG. 9, the lower limit threshold voltage V3 is a value closer to the lower limit operating voltage Vmin than the median value Vmid between the lower limit operating voltage Vmin and the upper limit operating voltage Vmax of the non-test battery 12. In FIG. 9, the range with a voltage lower than the lower limit threshold voltage V3 and indicated by the left-lower diagonal lines is referred to as the lower limit determination range. The upper limit threshold voltage V4 is a value closer to the upper limit operating voltage Vmax than the median value Vmid between the lower limit operating voltage Vmin and the upper limit operating voltage Vmax of the non-test battery 12. In FIG. 9, the range with a voltage higher than the upper limit threshold voltage V4 and indicated by the right-lower diagonal lines is referred to as the upper limit determination range. Also, the range that is not less than the lower limit threshold voltage V3 and not more than the upper limit threshold voltage V4 is referred to as the non-boost range. That is, in step S402, it is determined in which range the determination voltage Vj is.

[0048] When the determination voltage Vj is in the non-boost range (step S402: YES), the control device 20 temporarily ends the second forced boost process. When the determination voltage Vj is in the lower limit determination range (step S402: Vj < V3), the control device 20 calculates the voltage drop amount ΔVj(−) of the determination voltage Vj per unit time Δt in the most recent period. Then, the control device 20 determines whether or not the calculated voltage drop amount ΔVj(−) is larger than the allowable drop amount ΔVp(−) (second voltage determination process: step S403). In other words, the control device 20 determines whether or not the determination voltage Vj has dropped by a larger amount than the allowable drop amount ΔVp(−).

[0049] As shown in FIG. 10, the allowable drop amount ΔVp(−) is the voltage drop amount at which the determination voltage Vj1 at time t1 reaches the lower limit operating voltage Vmin at time t2 after a predetermined time has elapsed. The allowable drop amount ΔVp(−) may be set for each determination voltage Vj in the lower limit determination range. In this case, it is preferable that the allowable drop amount ΔVp(−) is set to a smaller value for a determination voltage Vj closer to the lower limit operating voltage Vmin.

[0050] When the voltage drop amount ΔVj(−) is greater than the allowable drop amount ΔVp(−) (step S403: YES), the control device 20 executes forced charging processing (step S404). On the other hand, when the voltage drop amount ΔVj(−) is less than or equal to the allowable drop amount ΔVp(−) (step S403: NO), the control device 20 temporarily ends the second forced boosting processing.

[0051] That is, when the determination voltage Vj is within the lower limit determination range and the voltage drop amount ΔVj(−) is greater than the allowable drop amount ΔVp(−), the control device 20 executes forced charging processing on the assumption that the forced charging condition is satisfied. In other words, the control device 20 executes forced charging processing when it is assumed that the voltage of the non-test battery 12 reaches the use lower limit voltage Vmin.

[0052] When the determination voltage Vj is within the upper limit determination range (step S402: V4 < Vj), the control device 20 calculates the voltage rise amount ΔVj(+) of the determination voltage Vj per unit time Δt in the immediate vicinity. Then, the control device 20 determines whether or not the calculated voltage rise amount ΔVj(+) is greater than the allowable rise amount ΔVp(+) (second voltage determination processing: step S405). In other words, the control device 20 determines whether or not the determination voltage Vj is rising by an amount greater than the allowable rise amount ΔVp(+).

[0053] As shown in FIG. 11, the allowable rise amount ΔVp(+) is the voltage rise amount at which the determination voltage Vj3 at time t3 reaches the use upper limit voltage Vmax at time t4 after a predetermined time has elapsed. The allowable rise amount ΔVp(+) may be set for each determination voltage Vj in the upper limit determination range. In this case, it is preferable that the allowable rise amount ΔVp(+) is set to a smaller value for a determination voltage Vj closer to the use upper limit voltage Vmax.

[0054] When the voltage increase amount ΔVj(+) is greater than the allowable increase amount ΔVp(+) (step S405: YES), the control device 20 executes forced discharge processing (step S406). On the other hand, when the voltage increase amount ΔVj(+) is less than or equal to the allowable increase amount ΔVp(+) (step S405: NO), the control device 20 temporarily ends the second forced boost processing.

[0055] That is, when the determination voltage Vj is within the upper limit determination range and the voltage increase amount ΔVj(+) is greater than the allowable increase amount ΔVp(+), the control device 20 executes forced discharge processing on the assumption that the forced discharge condition is satisfied. In other words, the control device 20 executes forced discharge processing when it is assumed that the voltage of the non-test battery 12 reaches the upper limit voltage Vmax for use.

[0056] (Operation of the Second Embodiment) As shown in FIG. 12, when the forced charge conditions (Vj < V3, ΔVp(-) < ΔVj(-)) are satisfied during the execution of the power sharing process, the control device 20 interrupts the power sharing process and executes the forced charge process. Also, when the forced discharge conditions (V4 < Vj, ΔVp(+) < ΔVj(+)) are satisfied during the execution of the power sharing process, the control device 20 interrupts the power sharing process and executes the forced discharge process. Therefore, the determination voltage Vj will transition while balancing between the lower limit voltage Vmin for use and the upper limit voltage Vmax for use.

[0057] The effects of the second embodiment will be described. (2-1) According to the charge / discharge test system 10, it is possible to effectively suppress the non-test battery 12 from reaching the upper limit voltage Vmax for use or the lower limit voltage Vmin for use. As a result, since the ratio occupied by the power sharing period becomes higher, further energy saving of the charge / discharge test system 10 can be achieved.

[0058] (2-2) It is possible to suppress the non-test battery 12 from being in an over-discharged state or an over-charged state. As a result, the life of the non-test battery 12 can be extended. <了 (2-3) By setting the allowable decrease amount ΔVp(−) to a smaller value as the determination voltage Vj approaches the lower limit voltage Vmin, it is possible to more effectively prevent the non-test battery 12 from reaching the lower limit voltage Vmin.

[0059] (2-4) By setting the allowable increase amount ΔVp(+) to a smaller value as the determination voltage Vj approaches the upper limit voltage Vmax, it is possible to more effectively prevent the non-test battery 12 from reaching the upper limit voltage Vmax.

[0060] (Third embodiment) A third embodiment of a charge / discharge test system, a charge / discharge test method, and a program will be described with reference to Figures 13 to 15. The charge / discharge test system, the charge / discharge test method, and the program of the third embodiment differ from the first and second embodiments in that the control device 20 executes a forced condition setting process. Therefore, in the third embodiment, the forced condition setting process will be described in detail, and the same parts as those of the first and second embodiments will be denoted by the same reference numerals and will not be described in detail again.

[0061] As shown in Fig. 13, in a facility where a charge / discharge test system 10 is installed, the power supplied to other equipment 5 through the AC bus 3 often varies depending on the time of day. The charge / discharge test system 10 of the third embodiment aims to smooth the power supply from the AC power source 4 to the entire facility. Specifically, by preferentially performing forced charging processing in non-peak times when the supply power W is equal to or less than a non-peak value W1, power is actively supplied from the AC bus 3 to the charge / discharge test system 10. In addition, by preferentially performing forced discharging processing in peak times when the supply power W is equal to or greater than a peak value W2, power is actively regenerated from the charge / discharge test system 10 to the AC bus 3.

[0062] As shown in FIG. 14, in the charge-discharge test system 10, supply status information 30 indicating the power supply status from the AC bus 3 to other equipment 5 is input to the control device 20. For example, as the supply status information 30, the control device 20 receives the total power consumption in real time from a higher-level power monitor that monitors the power consumption in other equipment 5. Also, for example, before the charge-discharge test, the control device 20 receives, as the supply status information 30, information that is generated in advance based on the monitoring results of the higher-level power monitor and in which the total power consumption is associated with each time. Then, the control device 20 repeatedly executes a forced condition setting process based on the supply status information 30 in parallel with the forced boost process.

[0063] As shown in FIG. 15, in the forced condition setting process, the control device 20 acquires the supply power W based on the supply status information 30 (step S501). Next, the control device 20 compares the acquired supply power W with the non-peak value W1 and the peak value W2 (step S502).

[0064] When the supply power W is equal to or greater than the non-peak value W1 and equal to or less than the peak value W2 (step S502: YES), the control device 20 temporarily ends the forced condition setting process. When the supply power W is smaller than the non-peak value W1 (step S502: W < W1), the control device 20 sets a forced condition regarding charging so that the forced charging of the non-test battery 12 is preferentially performed (step S503). Then, when step S503 ends, the control device 20 temporarily ends the forced condition setting process.

[0065] Regarding step S503, for example, the control device 20 that executes the first forced boost process sets a voltage greater than the forced charging voltage V1 as the forced charging voltage of the forced charging condition. For example, the control device 20 that executes the second forced boost process sets a voltage greater than the lower threshold voltage V3 as the lower threshold voltage of the forced charging condition, and also sets a decrease amount smaller than the allowable decrease amount ΔVp(-) as the allowable decrease amount of the forced charging condition. For example, the control device 20 sets a forced condition so that only the forced charging process is performed as the forced process in the forced boost process.

[0066] When the supply power W is greater than the peak value W2 (step S502: W2 < W), the control device 20 sets a forced condition regarding discharge so that the forced discharge of the non-test battery 12 is preferentially performed (step S504). Then, when step S504 ends, the control device 20 temporarily ends the forced condition setting process.

[0067] Regarding step S504, for example, the control device 20 that executes the first forced boost process sets a voltage smaller than the forced discharge voltage V2 as the forced discharge voltage of the forced discharge condition. For example, the control device 20 that executes the second forced boost process sets a voltage smaller than the upper threshold voltage V4 as the upper threshold voltage of the forced charging condition, and also sets an increase amount smaller than the allowable increase amount ΔVp(+) as the allowable increase amount of the forced charging condition. For example, the control device 20 sets a forced condition so that only the forced discharge process is performed as the forced process in the forced boost process.

[0068] The operation and effects of the third embodiment will be described. (3-1) In the charge / discharge test system 10, the forced condition is set based on the supply situation information 30. As a result, when the supply power W is in the non-peak band, forced charging is preferentially executed. Also, when the supply power W is in the peak band, forced discharge is preferentially executed. As a result, the smoothing of the supply power from the AC power source 4 to the entire facility can be achieved.

[0069] The first to third embodiments can be modified as follows: The first to third embodiments and the following modifications can be combined with each other within the scope of technical compatibility.

[0070] The control device 20 may execute a first forced boost process and a second forced boost process. This configuration more reliably prevents the non-test battery 12 from becoming over-discharged or over-charged.

[0071] The control device 20 may perform the forced boost process with the forced condition being the forced charging condition and the forced process being the forced charging process. The control device 20 may perform the forced boost process by setting the forced condition as the forced discharge condition and the forced process as the forced discharge process. [Explanation of symbols]

[0072] 3...AC bus, 4...AC power source, 5...equipment, 10...charge / discharge test system, 11...test battery, 12...non-test battery, 13...bidirectional AC / DC converter, 14...first bidirectional DC / DC converter, 15...second bidirectional DC / DC converter, 16...DC bus, 20...control device, 30...supply status information.

Claims

1. a bidirectional AC / DC converter having one end connected to an AC bus and the other end connected to a DC bus; a first bidirectional DC / DC converter having one end connected to the DC bus and the other end connected to a test battery, which is a secondary battery to be subjected to a charge / discharge test; a second bidirectional DC / DC converter having one end connected to the DC bus and the other end connected to a non-test battery that is a secondary battery not subject to the charge / discharge test; a control device that controls operation of the first bidirectional DC / DC converter and the second bidirectional DC / DC converter so that power is shared between the test battery and the non-test battery through the DC bus during the charge / discharge test, and controls operation of the bidirectional AC / DC converter according to excess or shortage of power on the DC bus, The control device a determination voltage acquisition process for acquiring a determination voltage, which is the voltage of the non-test battery; a voltage determination process for determining whether a forced condition set for the determination voltage is satisfied; When the forcing condition is met, a forcing process is executed to forcibly discharge or forcibly charge the non-test battery by controlling the operation of the second bidirectional DC / DC converter so that the forcing condition is not met. Charge and discharge test system.

2. the forced condition includes a forced charging condition in which the determination voltage reaches a forced charging voltage, In the forced processing, the control device maintains the non-test battery in a charging state until the determination voltage reaches a discharge start voltage. The charge / discharge test system according to claim 1 .

3. the forced discharge condition includes a forced discharge condition under which the determination voltage reaches a forced discharge voltage, In the forced processing, the control device maintains the non-test battery in a discharged state until the determination voltage reaches a charge start voltage. The charge / discharge test system according to claim 1 .

4. The mandatory condition is: a forced discharge condition in which the determination voltage is a value within an upper limit determination range and the increase amount of the determination voltage per unit time is greater than an allowable increase amount; a forced charging condition in which the determination voltage is a value within a lower limit determination range and a decrease in the determination voltage per unit time is greater than an allowable decrease amount, The control device In the forced processing, when the forced discharge condition is met, the non-test battery is maintained in a discharging state until the judgment voltage reaches a charging start voltage, and when the forced charge condition is met, the non-test battery is maintained in a charging state until the judgment voltage reaches a discharging start voltage. The charge / discharge test system according to claim 1 .

5. The control device A forced condition setting process is executed to acquire the power supply status from the AC bus to other equipment, set the forced condition so that forced discharging of the non-test battery is given priority when the power supply status is in a peak zone, and set the forced condition so that forced charging of the non-test battery is given priority when the power supply status is in a non-peak zone. The charge / discharge test system according to claim 1 .

6. a bidirectional AC / DC converter having one end connected to an AC bus and the other end connected to a DC bus; a first bidirectional DC / DC converter having one end connected to the DC bus and the other end connected to a test battery, which is a secondary battery to be subjected to a charge / discharge test; a second bidirectional DC / DC converter having one end connected to the DC bus and the other end connected to a non-test battery that is a secondary battery not subject to the charge / discharge test; a control device that controls operation of the first bidirectional DC / DC converter and the second bidirectional DC / DC converter so that power is shared between the test battery and the non-test battery through the DC bus during the charge / discharge test, and controls operation of the bidirectional AC / DC converter according to excess or shortage of power on the DC bus, The control device acquiring a judgment voltage, which is the voltage of the non-test battery; determining whether a forced condition set for the determination voltage is satisfied; When the forcing condition is met, the operation of the second bidirectional DC / DC converter is controlled to forcibly discharge or forcibly charge the non-test battery so that the forcing condition is not met. Charge / discharge test method.

7. a bidirectional AC / DC converter having one end connected to an AC bus and the other end connected to a DC bus; a first bidirectional DC / DC converter having one end connected to the DC bus and the other end connected to a test battery, which is a secondary battery to be subjected to a charge / discharge test; a second bidirectional DC / DC converter having one end connected to the DC bus and the other end connected to a non-test battery that is a secondary battery not subject to the charge / discharge test; a control device that controls operation of the first bidirectional DC / DC converter and the second bidirectional DC / DC converter so that power is shared between the test battery and the non-test battery through the DC bus during the charge / discharge test, and controls operation of the bidirectional AC / DC converter according to excess or shortage of power on the DC bus, The control device a determination voltage acquisition process for acquiring a determination voltage, which is the voltage of the non-test battery; a voltage determination process for determining whether a forced condition set for the determination voltage is satisfied; When the forcing condition is met, the operation of the second bidirectional DC / DC converter is controlled to forcibly discharge or forcibly charge the non-test battery so that the forcing condition is not met. program.

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