Charging and discharging test system

Abstract

The present invention is provided with: a plurality of charge / discharge test devices (12) that charge / discharge a charge / discharge body (9); a switching circuit (14) capable of switching a combination in which the one or more charge / discharge test devices (12) and the one or more charge / discharge bodies (9) are electrically connected; and a control unit (16) that controls the switching circuit (14) to switch the combination.

Description

Technical Field

[0001] The present invention relates to a charge and discharge test system for performing a charge and discharge test on a charge and discharge body. Background Art

[0002] In recent years, hybrid vehicles, plug-in hybrid vehicles, and electric vehicles are becoming more popular. In order to popularize these vehicles, the development of cheap driving batteries has become the key. These batteries are different from consumer batteries such as portable batteries, and generally have a large capacity of several kW to tens of kW. Therefore, the power of charging and discharging the battery during battery development and mass production testing becomes extremely large. In the future, as the above-mentioned types of vehicles become more popular, the power of charging and discharging will increase further. In addition, since many battery cells are used in combination in the above-mentioned types of vehicles, a charging and discharging test system that can test many battery cells in parallel is required.

[0003] The charge and discharge test system is equipped with a plurality of charge and discharge test devices. An AC (Alternating Current) power supply is electrically connected to one end of the plurality of charge and discharge test devices via an AC bus, and the other ends of the plurality of charge and discharge test devices are electrically connected to charge and discharge bodies such as batteries of the charge and discharge test objects. Each charge and discharge test device is composed of, for example, a bidirectional AC / DC (Direct Current) converter and a bidirectional DC / DC converter, and controls the charge and discharge including the charging of DC power (DC current) to the charge and discharge body and the discharging of DC power (DC current) from the charge and discharge body.

[0004] Furthermore, in the charge and discharge test system, a measuring unit for measuring the voltage of the charge and discharge body and the current flowing through the charge and discharge test device is provided for each of the plurality of charge and discharge test devices.

[0005] Prior Art Literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Publication No. 2012-154793 Summary of the invention

[0008] -Problems to be solved by the invention-

[0009] In a charge-discharge test system having a plurality of charge-discharge test devices, for example, by increasing the number of connection of charge-discharge units (charge-discharge test devices or bidirectional DC / DC converters, etc.) electrically connected to a charge-discharge body, the current capacity that can charge and discharge the charge-discharge body can be increased. As an example, in a case where a charge-discharge test device can charge and discharge a charge-discharge body with a current of 120A, by electrically connecting M (M is an arbitrary natural number) charge-discharge units to a charge-discharge body, the charge-discharge body can be charged and discharged with a current capacity of 120A×M.

[0010] However, in the previous charge and discharge test system, whenever the number of connection of the charge and discharge unit is changed, the connection relationship between the charge and discharge unit and the charge and discharge body is manually changed, and a correction value for correcting the measured values ​​of the voltage and current measured by the above-mentioned measuring units may be required. Therefore, the operation of changing the connection relationship between the charge and discharge unit and the charge and discharge body and the correction operation of obtaining the correction value require a lot of time. Therefore, in the previous charge and discharge test system, the number of charge and discharge units electrically connected to the same charge and discharge body is fixed in multiple charge and discharge test devices, that is, multiple charge and discharge units used in a parallel connection state are determined.

[0011] For example, in a charge and discharge test system with four charge and discharge units [4CH (channel)] with a maximum output current of 120A, 2CH of charge and discharge units are used only when they are electrically connected to different charge and discharge bodies, and the remaining 2CH of charge and discharge units are used when they are electrically connected to the same charge and discharge body. In this case, it was originally possible to perform a charge and discharge test of less than 120A with 4CH, but since the 2CH of charge and discharge units in 4CH are connected in parallel, it is limited to a maximum of 3CH of charge and discharge test. In addition, since the number of parallel connections of the charge and discharge units is fixed to two, it is clear that by connecting four charge and discharge units in parallel, it is possible to perform a charge and discharge test with a current capacity of 480A (120A×4CH), but it is limited to a charge and discharge test based on a capacity current of up to 240A (120A×2CH).

[0012] Therefore, a charge and discharge test system is desired that can easily change the number of charge and discharge units electrically connected to the same charge and discharge body without taking time in calibration work.

[0013] The present invention has been made in view of the above circumstances, and a first object of the present invention is to provide a charge and discharge test system capable of easily changing the number of connection of charge and discharge units electrically connected to a charge and discharge body.

[0014] Furthermore, when a plurality of charge and discharge units are electrically connected to the same charge and discharge body to perform a charge and discharge test, another problem also arises.

[0015] Specifically, in the charge and discharge test system, a charge and discharge unit using a switch control method is often used, which controls the magnitude of the output current by switching a switching element such as a FET (Field effect transistor) on and off. The output current from the charge and discharge unit using the switch control method is pulsating (also called pulsating current).

[0016] Therefore, when a plurality of charge-discharge units are electrically connected in parallel to the same charge-discharge body, current pulsations are generated in each of the plurality of charge-discharge units, and the current pulsations are synthesized. In this case, a large current pulsation (current noise) is synthesized according to the phases (overlapping of peaks) of the current pulsations (see Fig.12 ). Each charge and discharge unit operates independently, but each has the same internal switching frequency, so the peak values ​​of each current pulsation are likely to overlap. Therefore, for example, in the case of 4CH charge and discharge units, the peak value of the current fluctuation may be 4 times the maximum.

[0017] The present invention has been made in view of the above circumstances, and a second object of the present invention is to provide a charge and discharge test system capable of reducing current ripple.

[0018] -Methods for solving problems-

[0019] The charge and discharge test system for achieving the first object of the present invention comprises: a plurality of charge and discharge units for charging and discharging a charge and discharge body; a switching circuit capable of switching a combination of electrically connecting one or more charge and discharge units to one or more charge and discharge bodies; and a control unit for controlling the switching circuit to switch the combination.

[0020] According to this charge and discharge test system, it is possible to control the switching circuit and automatically switch the combination.

[0021] In the charge and discharge test system according to another aspect of the present invention, the switching circuit can switch to a combination of electrically connecting one or more charge and discharge units to the same charge and discharge body, thereby eliminating the need for an operator to manually switch the combination.

[0022] In another embodiment of the present invention, the charge and discharge test system includes: a measuring unit, which is provided in each of a plurality of charge and discharge units, and measures at least one of the voltage of the charge and discharge unit and the current flowing through the charge and discharge unit; a correction value acquisition control unit, which acquires a correction value for correcting the measured value of the measuring unit for each combination; and a correction unit, which selects a correction value corresponding to the combination of switching circuits from the correction values ​​of each combination acquired by the correction value acquisition control unit, and corrects the measured value based on the selected correction value. Thus, the effort of the correction operation of acquiring the correction value for each combination can be greatly reduced.

[0023] In a charge-discharge test system according to another embodiment of the present invention, one end of a plurality of charge-discharge units is electrically connected to each other via a bus, and the other end of the plurality of charge-discharge units is connected to a switching circuit. A control unit controls the plurality of charge-discharge units electrically connected to the plurality of charge-discharge units via the switching circuit to control the charge and discharge of the plurality of charge-discharge units. The control unit causes the power output from the one or more charge-discharge units to discharge via the switching circuit and the charge-discharge unit to charge the one or more charge-discharge units that can be charged via the bus, the one or more charge-discharge units, and the switching circuit. Thus, the power usage efficiency of the charge-discharge test system can be improved.

[0024] In a charge-discharge test system according to another embodiment of the present invention, when the plurality of charge-dischargers connected to the other end of the switching circuit each include one or more charge-dischargers to be the subject of the charge-discharge test, namely the test charge-discharger, and a charge-discharger different from the test charge-discharger, namely the reserve charge-discharger, the control unit switches the switching circuit to a combination in which the plurality of charge-discharge units are electrically connected to the same reserve charge-discharger. Thus, by increasing the number of charge-discharge units electrically connected to the same reserve charge-discharger, the amount of current charged and discharged by the reserve charge-discharger can be greatly increased.

[0025] The charge and discharge test system for achieving the second purpose of the present invention comprises: a plurality of charge and discharge units, which charge and discharge the same charge and discharge body while being connected in parallel with the same charge and discharge body, and control the magnitude of the output current by means of a switch control method; and a control unit, which makes the phase of the switch of each of the plurality of charge and discharge units different from each other.

[0026] According to this charge and discharge test system, the current pulsations outputted from the respective charge and discharge units cancel each other out, thereby reducing the current pulsations.

[0027] In a charge and discharge test system according to another embodiment of the present invention, when the number of the plurality of charge and discharge units is N (N is a natural number greater than or equal to 2), the control unit shifts the phase of the switch of each of the plurality of charge and discharge units by 360° / N. This can minimize current pulsation.

[0028] In the charge and discharge test system according to another aspect of the present invention, the plurality of charge and discharge units make switching phases different from each other based on a synchronization signal input from the control unit.

[0029] -Effects of the Invention-

[0030] The charge and discharge test system for achieving the first object of the present invention can reduce the labor of calibration work when the combination of one or more charge and discharge units electrically connected to the charge and discharge body can be changed.

[0031] The charge and discharge test system for achieving the second object of the present invention can reduce current ripple. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the charge and discharge test system according to the first embodiment.

[0033] Figure 2 This is an explanatory diagram for explaining an example of electrical connection between any one or more charge and discharge test devices and any one or more charge and discharge bodies using a switching circuit.

[0034] Figure 3 This is an explanatory diagram for explaining an example of electrical connection between any one or more charge and discharge test devices and any one or more charge and discharge bodies using a switching circuit.

[0035] Figure 4 This is an explanatory diagram showing a combination of one or more charge and discharge test devices that can be electrically connected to the same charge and discharge body.

[0036] Figure 5 This is a flowchart showing the flow of the calibration work.

[0037] Figure 6 This is an explanatory diagram for explaining a charge and discharge test of one or more charge and discharge bodies performed by a charge and discharge test control unit and correction of a measurement value of a measuring unit performed by a correction unit.

[0038] Figure 7 It is an explanatory diagram for explaining energy sharing (Energy Sharing: ES) using a spare charge and discharge body in the charge and discharge test system.

[0039] Figure 8 It is an explanatory diagram for explaining the ES of the preliminary charge and discharge body using the charge and discharge test system.

[0040] Fig. 9 It is a schematic diagram of a charge and discharge test system according to a second embodiment.

[0041] Fig.10 It is a schematic diagram of a charge and discharge test system according to a third embodiment.

[0042] Fig.11 It is a schematic diagram of a charge and discharge test system according to a fourth embodiment.

[0043] Fig.12 This is an explanatory diagram for explaining the problems encountered when charging and discharging the same charging and discharging body is performed by each charging and discharging test apparatus of a switch control system.

[0044] Fig.13 This is an explanatory diagram for explaining the phase control of the switches of each charge and discharge test device by the control unit.

[0045] Fig.14 It is a schematic diagram of a charge and discharge test system according to a fifth embodiment. DETAILED DESCRIPTION

[0046] [First embodiment]

[0047] Figure 1 FIG. 1 is a schematic diagram of a charge and discharge test system 10 according to a first embodiment. Figure 1 As shown, the charge-discharge test system 10 performs a charge-discharge test on one or more charge-discharge bodies 9. The charge-discharge bodies 9 are various well-known secondary batteries such as lithium-ion batteries, nickel-hydrogen batteries, and all-solid batteries (and also devices capable of storing electricity such as large-capacity capacitors such as double-layer capacitors).

[0048] The charge and discharge test system 10 includes a plurality of charge and discharge units, for example, a charge and discharge test device 12 , a switching circuit 14 , and a control unit 16 .

[0049] As shown by the bracketed numbers (1) to (4), four charge and discharge test devices 12 are provided, and the charge and discharge of the charge and discharge body 9 electrically connected via the switching circuit 14 described later is performed under the control of the control unit 16 described later. Thus, the charge and discharge test system 10 can perform charge and discharge tests on up to four charge and discharge bodies 9 in parallel. In addition, the number of the charge and discharge test devices 12 is not particularly limited as long as it is two or more.

[0050] One end of each charge and discharge test device 12 is electrically connected to the AC power source 20 via the AC bus 18. In other words, each of the plurality of charge and discharge test devices 12 is electrically connected to the AC power source 20 via the AC bus 18. In addition, the other end of each charge and discharge test device 12, which is opposite to the one end, is electrically connected to different ports 14a of the switching circuit 14.

[0051] Although not shown in the figure, each charge and discharge test device 12 includes a bidirectional AC / DC converter and a bidirectional DC / DC converter. Each charge and discharge test device 12 performs AC / DC conversion of converting AC power (AC current) input from the AC power source 20 via the AC bus 18 into DC power (DC current) and DC / DC conversion of stepping down the high voltage of the DC power, and then outputs the stepped-down DC power to the charge and discharge body 9 via the switching circuit 14. In addition, the charge and discharge test device 12 performs DC / DC conversion of stepping up the low voltage of the DC power input from the charge and discharge body 9 via the switching circuit 14 and DC / AC conversion of converting the stepped-up DC power into AC power, and then regenerates the AC power to the AC power source 20 via the AC bus 18 or outputs it to other charge and discharge test devices 12.

[0052] Each charge and discharge test device 12 is provided with a measuring unit 13. Each measuring unit 13 measures at least one of the magnitude of the voltage of the charge and discharge body 9 electrically connected to the charge and discharge test device 12 via the switching circuit 14 and the magnitude of the current flowing through the charge and discharge test device 12 (both in this embodiment), by a known method, and outputs the measured values ​​of the voltage and current to the control unit 16. In addition, each measuring unit 13 may be provided separately from each charge and discharge test device 12.

[0053] In addition, in the present embodiment, the case where each charge and discharge test device 12 includes a bidirectional AC / DC converter and a bidirectional DC / DC converter (not shown) is described as an example, but each charge and discharge test device 12 may include only a bidirectional DC / DC converter as a converter. In this case, the bidirectional AC / DC converter is electrically connected to the AC power supply 20 via the AC bus 18, and each charge and discharge test device 12 is electrically connected to the bidirectional AC / DC converter in parallel via a DC bus (not shown).

[0054] A plurality of ports 14a are provided on one end side of the switching circuit 14, and a plurality of ports 14b are provided on the other end side opposite to the one end of the switching circuit 14. The charge-discharge test device 12 can be electrically connected to the plurality of ports 14a, respectively. In addition, the charge-discharge body 9 can be electrically connected to the plurality of ports 14b, respectively. Thus, in the switching circuit 14, each charge-discharge test device 12 is electrically connected to each port 14a, and each charge-discharge body 9 is electrically connected to each port 14b.

[0055] Figure 2 as well as Figure 3 1 is an explanatory diagram for explaining an example of electrical connection between any one or more charge and discharge test devices 12 and any one or more charge and discharge bodies 9 based on a switching circuit 14. The switching circuit 14 can electrically connect a plurality of ports 14a and a plurality of ports 14b arbitrarily under the control of a control unit 16 described later. Figure 2 As shown in the reference numerals 2A to 2C, the switching circuit 14 can electrically connect each port 14a and each port 14b one to one. Figure 3 As shown in the reference numerals 3A to 3C of the drawings, the switching circuit 14 can electrically connect the plurality of ports 14a and any port 14b in a many-to-one manner. When the plurality of ports 14a and any port 14b are electrically connected in a many-to-one manner, the charge-discharge test devices 12 respectively connected to the plurality of ports 14a connected to the any port 14b are electrically connected in parallel. As described above, the switching circuit 14 can electrically connect one or more charge-discharge bodies 9 to one or more charge-discharge test devices 12 at will.

[0056] In addition, the switching circuit 14 can switch the combination of at least one charging and discharging test device 12 electrically connected to the charging and discharging body 9 (hereinafter, sometimes referred to as a combination of charging and discharging test devices 12 or a device combination). For example, the switching circuit 14 can switch the number of charging and discharging test devices 12 electrically connected in parallel to one charging and discharging body 9 (hereinafter, referred to as the number of connections or the number of parallel connections). In other words, the switching circuit 14 can arbitrarily increase or decrease the number of charging and discharging test devices 12 connected in parallel to one charging and discharging body 9 (refer to Figure 3 ). That is, the charge and discharge test system 10 can change the current capacity that can charge and discharge the charge and discharge body 9 by changing the parallel number using the switching circuit 14.

[0057] As described above, when the switching circuit 14 is controlled to switch the combination of the charge and discharge test devices 12 with respect to the charge and discharge body 9, in particular, when the number of parallel connection of the charge and discharge test devices 12 is switched, a correction value is required for correcting the measured values ​​of the voltage and current measured by the measuring unit 13 of each charge and discharge test device 12. A correction operation (hereinafter referred to as a "correction operation") for obtaining the correction value for each combination of the charge and discharge test device 12 is performed in advance by, for example, the manufacturer of the charge and discharge test system 10. In addition, the correction operation is also called a calibration operation.

[0058] return Figure 1 The control unit 16 uses a known control device such as a programmable logic controller (PLC). In addition, the control unit 16 may be a combination of a PLC and a PC (Personal Computer) or a terminal other than a PC (a portable terminal, a tablet terminal, etc.).

[0059] The control unit 16 is electrically connected to each charge and discharge test device 12 and the switching circuit 14. During the charge and discharge test, the control unit 16 controls one or more charge and discharge test devices 12 and the switching circuit 14 to perform the charge and discharge test of one or more charge and discharge bodies 9 according to the charge and discharge pattern of the charge and discharge body 9 input in advance by the operator. In addition, the control unit 16 controls each charge and discharge test device 12 and the switching circuit 14 during the calibration operation to obtain the calibration value of each combination of the charge and discharge test device 12.

[0060] The control unit 16 includes a correction value acquisition control unit 30, a charge and discharge test control unit 32, and a correction unit 34. These units may be realized by, for example, the control unit 16 executing a control program (not shown), or may be a circuit for executing each function.

[0061] The correction value acquisition control unit 30 controls the correction operation. In addition, the correction value acquisition control unit 30 performs the correction operation, for example, in a state where the charge and discharge body 9a (including a voltage and current generator capable of charge and discharge) for the correction operation is electrically connected to any one of the ports 14b of the switching circuit 14. In addition, in the correction operation of the present embodiment, it is assumed that the charge and discharge test devices 12 are electrically connected to the four ports 14a of the switching circuit 14, that is, the four charge and discharge test devices 12 are electrically connected to the switching circuit 14.

[0062] Figure 4 1 is an explanatory diagram showing a combination of one or more charge and discharge test devices 12 (device combination) that can be electrically connected to the same charge and discharge body 9a. Figure 4 As well as the already mentioned Figure 1 As shown, the number of modes of the device combination is determined by the number of charge and discharge test devices 12 mounted on the charge and discharge test system 10. In the present embodiment, the number of charge and discharge test devices 12 is four, so the number of modes of the combination of the charge and discharge test devices 12 is 10. Then, the correction value acquisition control unit 30 sequentially switches the device combination for all combinations.

[0063] Specifically, the correction value acquisition control unit 30 repeatedly executes, for all device combinations, a process of generating a combination command signal D1 indicating the device combination and a process of outputting the combination command signal D1 to the switching circuit 14 and the corresponding charge and discharge test device 12. In addition, when a plurality of charge and discharge test devices 12 are electrically connected in parallel to the charge and discharge body 9a by the switching circuit 14, the combination command signal D1 includes a parallel command signal (synchronization signal, etc.) for causing the plurality of charge and discharge test devices 12 to simultaneously perform charge and discharge of the same charge and discharge body 9a.

[0064] The switching circuit 14 switches to the device combination specified by the combination command signal D1 input from the correction value acquisition control unit 30. In addition, all the charge and discharge test devices 12 to which the combination command signal D1 is input from the correction value acquisition control unit 30 charge and discharge the charge and discharge body 9a according to the given charge and discharge pattern for correction value calculation. Thus, the switching of the switching circuit 14 corresponding to the device combination and the charging and discharging of the charge and discharge body 9a by all the charge and discharge test devices 12 corresponding to the device combination are repeatedly performed.

[0065] In addition, the correction value acquisition control unit 30 repeatedly performs the process of outputting the correction condition switching command signal D2 corresponding to the device combination to the switching circuit 14 for all combinations. The correction condition switching command signal D2 is a control signal for switching to the correction condition corresponding to the device combination (short circuit of the output circuit during offset adjustment and polarity switching during voltage correction, etc.), and is determined for each device combination. The switching circuit 14 operates according to the correction condition switching command signal D2 input from the correction value acquisition control unit 30. In this way, the switching of the correction condition of the switching circuit 14 corresponding to the device combination is repeatedly performed.

[0066] Furthermore, whenever the charge and discharge test device 12 corresponding to the device combination performs charge and discharge of the charge and discharge body 9a, the correction value acquisition control unit 30 repeatedly performs acquisition of the voltage and current measurement values ​​from the measurement unit 13 of the charge and discharge test device 12 that performs the charge and discharge, and calculation of the correction value based on the obtained measurement values. In addition, the specific calculation method of the correction value is a well-known technology, so the specific description is omitted here. In this way, the correction value of the measurement unit 13 of each device combination is obtained and stored in a storage unit, etc., which is not shown in the figure.

[0067] Figure 5 is a flowchart showing the flow of the calibration work. Figure 5 As shown, after the manufacturer of the charge and discharge test system 10 connects the charge and discharge body 9 a to any port 14 b of the switching circuit 14 , the manufacturer operates an operation unit (not shown) to input a start operation of the calibration work to the control unit 16 (step S1 ).

[0068] When the control unit 16 receives the start operation of the calibration operation, it functions as the calibration value acquisition control unit 30. The calibration value acquisition control unit 30 generates a combination instruction signal D1 indicating the first device combination among all device combinations, and outputs the combination instruction signal D1 to the switching circuit 14 and the corresponding charge and discharge test device 12 (step S2). In addition, the calibration value acquisition control unit 30 outputs a calibration condition switching instruction signal D2 corresponding to the first device combination to the switching circuit 14 (step S3). In addition, the order of step S2 and step S3 may be reversed, or may be performed simultaneously.

[0069] The switching circuit 14 switches to the first device combination based on the combination instruction signal D1 input from the correction value acquisition control unit 30 (step S4). In addition, the switching circuit 14 switches the correction condition of the switching circuit 14 corresponding to the first device combination according to the correction condition switching instruction signal D2 input from the correction value acquisition control unit 30 (step S5).

[0070] When the switching of the switching circuit 14 and the switching of the calibration conditions are completed, all the charge and discharge test devices 12 corresponding to the first device combination operate to charge and discharge the charge and discharge body 9a according to the given charge and discharge pattern for calculating the calibration value (step S6).

[0071] Next, the correction value acquisition control unit 30 acquires the voltage and current measurement values ​​from the measuring unit 13 of the charge and discharge test device 12 that performs the charge and discharge while the charge and discharge test device 12 corresponding to the first device combination performs the charge and discharge of the charge and discharge body 9a (step S7). Then, the correction value acquisition control unit 30 calculates the correction value based on the acquired voltage and current measurement values ​​(step S8). Thus, the acquisition of the correction value corresponding to the first device combination is completed, and the correction value is stored in a storage unit (not shown) by the correction value acquisition control unit 30.

[0072] Next, for all the device combinations after the second one, the above-mentioned processing of steps S2 to S8 is repeatedly performed, and the acquisition and storage of the correction values ​​corresponding to all the device combinations are completed (step S9). At this time, the switching of the switching circuit 14 and the switching of the correction conditions can be automatically performed, so the operator does not need to manually perform these switches, which can greatly reduce the effort of the correction operation. As a result, it is not necessary to use a charging and discharging test device that is electrically connected to the charging and discharging body 9 alone and a charging and discharging test device that is electrically connected to the charging and discharging body 9 in parallel in a plurality of charging and discharging test devices 12 as in the past. As a result, the number of connections of the charging and discharging test device 12 can be arbitrarily increased or decreased according to the capacity of the charging and discharging body 9 of the object of the charging and discharging test, so the amount of current that can charge and discharge the charging and discharging body 9 can be freely changed.

[0073] In the first embodiment, correction values ​​corresponding to all device combinations are obtained, but when the types of the charge and discharge test devices 12 are the same, correction values ​​may be obtained while changing only the number of connected charge and discharge test devices 12. For example, in the first embodiment, the number of connected charge and discharge test devices 12 can be changed between 1 and 4, so four correction values ​​can be obtained.

[0074] Figure 6 This is an explanatory diagram for explaining the charge and discharge test of one or more charge and discharge bodies 9 performed by the charge and discharge test control unit 32 and the correction of the measurement value of the measurement unit 13 performed by the correction unit 34 .

[0075] like Figure 6As shown, the charge and discharge test control unit 32 switches the switching circuit 14 based on the combination of one or more charge and discharge test devices 12 and one or more charge and discharge bodies 9 during the charge and discharge test input by the operator. In addition, the charge and discharge test control unit 32 controls the charge and discharge of one or more charge and discharge bodies 9 by controlling the one or more charge and discharge test devices 12 based on the charge and discharge pattern for the charge and discharge test of the charge and discharge body 9 input in advance by the operator.

[0076] At this time, when the charge and discharge test control unit 32 performs charge and discharge control on a plurality of charge and discharge bodies 9, the charge and discharge test control unit 32 synchronizes the charge timing of charging one or more charge and discharge bodies 9 with the discharge timing of discharging from the other one or more charge and discharge bodies 9 among the plurality of charge and discharge bodies 9. Thus, the charge and discharge test control unit 32 performs energy sharing (ES) in which the power discharged from one or more charge and discharge bodies 9 is used for charging the other one or more charge and discharge bodies 9.

[0077] In addition, the charge-discharge test control unit 32 determines whether the power discharged from all the charge-discharge units 9 that perform discharge, that is, the discharge power, is surplus or insufficient with respect to the power required for charging all the charge-discharge units 9 that perform charge, that is, the required charging power. Furthermore, when there is a surplus of discharge power with respect to the required charging power, the charge-discharge test control unit 32 regenerates surplus power corresponding to the surplus amount of discharge power from one or more charge-discharge units 9 via the switching circuit 14, one or more charge-discharge test devices 12, and the AC bus 18 to the AC power supply 20 (see reference numeral RE in the figure) in addition to executing the above-mentioned ES.

[0078] On the contrary, when the discharge power is insufficient relative to the power required for charging, the charge and discharge test control unit 32, in addition to executing the above-mentioned ES, also charges one or more charge and discharge bodies 9 with insufficient power (see the figure mark SU) corresponding to the insufficient amount of discharge power from the AC power supply 20 via the AC bus 18, one or more charge and discharge test devices 12 and the switching circuit 14.

[0079] When the charge-discharge test control unit 32 performs a charge-discharge test of one or more charge-discharge bodies 9, the correction unit 34 selects and obtains the correction value corresponding to the combination of one or more charge-discharge test devices 12 and one or more charge-discharge bodies 9 electrically connected via the switching circuit 14 from the storage unit (not shown). Then, the correction unit 34 corrects the measured values ​​of voltage and current measured by the measuring unit 13 of all charge-discharge test devices 12 in the charge-discharge test based on the obtained correction value. In addition, the corrected measurement value is used for the charge-discharge control of the charge-discharge test control unit 32.

[0080] Figure 7 as well as Figure 81 is an explanatory diagram for explaining the ES of the preliminary charge and discharge body 9-2 using the charge and discharge test system 10. Figure 7 as well as Figure 8 As shown, the plurality of charge-dischargers 9 include one or more charge-dischargers 9 to be the subject of the charge-discharge test, namely, the test charge-discharger 9-1, and the charge-discharger 9 not to be the subject of the charge-discharge test, namely, the reserve charge-discharger 9-2. Furthermore, the switching circuit 14 may be electrically connected to one or more test charge-dischargers 9-1 and the reserve charge-discharger 9-2, respectively. In addition, in the figure, one reserve charge-discharger 9-2 is electrically connected to the switching circuit 14, but a plurality of reserve charge-dischargers 9-2 may be electrically connected.

[0081] The test charge-discharge body 9-1 and the reserve charge-discharge body 9-2 are different from each other in, for example, whether they are charge-discharge bodies 9 to be tested, but the types of the two may be the same or different. Hereinafter, the charge-discharge test device 12 electrically connected to the reserve charge-discharge body 9-2 via the switching circuit 14 is appropriately referred to as the "remaining unit 12A".

[0082] The charge and discharge test control unit 32 compares the required charging power required for charging all the test charge and discharge units 9-1 that are charged in the charge and discharge test with the power discharged from all the test charge and discharge units 9-1 that are discharged. In addition, when there is a surplus of discharged power relative to the required charging power, the charge and discharge test control unit 32 performs charging based on the surplus power of the reserve charge and discharge unit 9-2 in addition to the above-mentioned ES.

[0083] Specifically, the charge-discharge test control unit 32 controls one or more charge-discharge test devices 12 and one or more surplus units 12A to charge one or more reserve charge-discharge units 9-2 with surplus power. As a result, the surplus power output from one or more test charge-discharge units 9-1 via the switching circuit 14 and the charge-discharge test device 12 is charged to one or more reserve charge-discharge units 9-2 via the AC bus 18, one or more charge-discharge test devices 12, and the switching circuit 14 (see Figure 8 ).

[0084] When the surplus power exceeds the chargeable capacity of all the preparatory charge and discharge units 9 - 2 , excess power corresponding to the excess amount is regenerated in the AC power source 20 (see reference symbol RE).

[0085] On the other hand, when the discharge power is insufficient relative to the power required for charging, the charge-discharge test control unit 32 performs the discharge based on the power of the reserve charge-discharge unit 9-2 in addition to the ES described above. Specifically, the charge-discharge test control unit 32 controls one or more charge-discharge test devices 12 and one or more remaining units 12A to supply power from one or more reserve charge-discharge units 9-2. Thus, the power output from one or more reserve charge-discharge units 9-2 via the switching circuit 14 and the remaining unit 12A is charged to one or more test charge-discharge units 9-1 via the AC bus 18, one or more charge-discharge test devices 12, and the switching circuit 14 (see Figure 7 ).

[0086] When the shortfall in discharge power relative to the required charging power cannot be made up by the power discharged from all the preparatory charge and discharge units 9 - 2 alone, the shortfall is made up by power supply from the AC power source 20 (see reference symbol SU).

[0087] By charging the spare power to the spare charge / discharge unit 9-2 or supplying power from the spare charge / discharge unit 9-2, the spare power regenerated by the AC power supply 20 and the power supplied from the AC power supply 20 can be minimized. As a result, the power use efficiency of the charge / discharge test system 10 can be improved.

[0088] In addition, in the charge and discharge test system 10 of the first embodiment, as described above, the number of connection of the charge and discharge test device 12 electrically connected to the same charge and discharge body 9 (test charge and discharge body 9-1, reserve charge and discharge body 9-2) via the switching circuit 14 can be increased or decreased arbitrarily. Therefore, by increasing the number of connection of the charge and discharge test device 12, the amount of current for charging and discharging the reserve charge and discharge body 9-2 can be greatly increased. As a result, the surplus power regenerated in the AC power supply 20 and the power supply from the AC power supply 20 can be reduced, so the power use efficiency of the charge and discharge test system 10 can be further improved. In addition, the plurality of remaining units 12A can be controlled in parallel according to the same charge and discharge mode, so compared with the case where the plurality of remaining units 12A are independently controlled according to different charge and discharge modes, the control can be simplified and the load can be reduced.

[0089] Conversely, the parallel connection of the plurality of surplus cells 12A to the same preparatory charge and discharge body 9 - 2 can be cancelled according to the user's wishes, and the number of preparatory charge and discharge bodies 9 - 2 (the number of channels) electrically connected to the switching circuit 14 can be increased.

[0090] As described above, in the charge and discharge test system 10 of the first embodiment, by providing a switching circuit 14 that can arbitrarily switch the electrical connection between one or more charge and discharge test devices 12 and one or more charge and discharge bodies 9, 9a, the combination of one or more charge and discharge test devices 12 electrically connected to the charge and discharge bodies 9, 9a can be changed, and the time for calibration operations can be greatly reduced.

[0091] [Second embodiment]

[0092] Fig. 9 FIG. 4 is a schematic diagram of a charge and discharge test system 40 according to a second embodiment. Fig. 9 As shown, the charge and discharge test system 40 performs a charge and discharge test on one or more charge and discharge bodies 9 .

[0093] The charge and discharge test system 40 includes a charge and discharge test device 12 , a switching circuit 14 , and a control unit 16 .

[0094] The charge and discharge test device 12 includes a bidirectional AC / DC converter 121 and a plurality of charge and discharge units such as a bidirectional DC / DC converter 122. Fig. 9 In the figure, the bidirectional AC / DC converter is abbreviated as AC / DC converter, and the bidirectional DC / DC converter is abbreviated as DC / DC converter.

[0095] The plurality of bidirectional DC / DC converters 122 are respectively connected to the plurality of charging and discharging bodies 9 via the switching circuit 14 similarly to the charging and discharging test device 12 in the first embodiment.

[0096] The switching circuit 14 is similar to the charge and discharge test device 12 in the first embodiment, and is capable of switching the combination of at least one bidirectional DC / DC converter 122 electrically connected to the charge and discharge body 9 (hereinafter, sometimes also referred to as the combination of converters 122 or the converter combination). The switching circuit 14 is, for example, capable of switching the number of bidirectional DC / DC converters 122 electrically connected in parallel to one charge and discharge body 9 (the number of connections or the number of parallel connections). When the switching circuit 14 is controlled to switch the converter combination for the charge and discharge body 9, especially when the number of parallel connections of the bidirectional DC / DC converters 122 is switched, the switching circuit 14 corrects the measured values ​​of the voltage and current measured by the measuring unit 13 of each bidirectional DC / DC converter 122 by the correction value of each converter combination, as in the first embodiment.

[0097] [Third Embodiment]

[0098] Fig.10 FIG. 4 is a schematic diagram of a charge and discharge test system 42 according to a third embodiment. Fig.10 As shown, the charge and discharge test system 42 performs a charge and discharge test on one or more charge and discharge bodies 9 .

[0099] The charge and discharge test device 12 includes a bidirectional AC / DC converter 121, a plurality of charge and discharge units such as a bidirectional DC / DC converter 122, a switching circuit 14, and a control unit 16. Fig.10 In the figure, the bidirectional AC / DC converter is abbreviated as AC / DC converter, and the bidirectional DC / DC converter is abbreviated as DC / DC converter.

[0100] The plurality of bidirectional DC / DC converters 122 are respectively connected to the plurality of charging and discharging bodies 9 via the switching circuit 14 similarly to the charging and discharging test device 12 in the first embodiment.

[0101] The switching circuit 14 can switch the number of bidirectional DC / DC converters 122 connected in parallel to one charging and discharging body 9 in the same manner as in the second embodiment.

[0102] [Fourth Embodiment]

[0103] Fig.11 FIG. 5 is a schematic diagram of a charge and discharge test system 50 according to a fourth embodiment. Fig.11 As shown, the charge and discharge test system 50 uses a plurality of charge and discharge units 52 to perform a charge and discharge test on one charge and discharge body 9. The charge and discharge body 9 of the fourth embodiment is the same as the charge and discharge body 9 described in the first embodiment.

[0104] The charge and discharge test system 50 of the fourth embodiment includes a plurality of charge and discharge units 52 and a control unit 54. Here, the charge and discharge unit 52 may be, for example, a charge and discharge test device or a bidirectional DC / DC converter. In addition, when the charge and discharge unit 52 is a bidirectional DC / DC converter, Fig. 9 or Fig.10 As shown, a bidirectional AC / DC converter (not shown) is configured between the AC power source and the bidirectional DC / DC converter.

[0105] As in the first embodiment, four charge and discharge units 52 are provided as indicated by bracketed numbers (1) to (4), and charge and discharge the same charge and discharge body 9 under the control of a control unit 54 described later. The number of charge and discharge units 52 is not particularly limited as long as it is two or more.

[0106] One end of each charge and discharge unit 52 is electrically connected to the AC power source 20 via the AC bus 18 as in the first embodiment. In other words, the plurality of charge and discharge units 52 connected in parallel to the AC power source 20 are electrically connected via the AC bus 18. In addition, the other end of each charge and discharge unit 52 on the opposite side to the one end is electrically connected to the same charge and discharge body 9 via the DC bus 56. In other words, the plurality of charge and discharge units 52 connected in parallel to the same charge and discharge body 9 are electrically connected via the DC bus 56.

[0107] Each charge and discharge unit 52 has a structure basically the same as the charge and discharge test device 12 of the first embodiment described above, and after performing AC / DC conversion of converting AC power input from the AC power supply 20 via the AC bus 18 into DC power and DC / DC conversion of stepping down the high voltage of the DC power, the stepped-down DC power is output to the charge and discharge body 9 via the DC bus 56. In addition, after performing DC / DC conversion of stepping up the low voltage of the DC power input from the charge and discharge body 9 via the DC bus 56 and DC / AC conversion of converting the stepped-up DC power into AC power, each charge and discharge unit 52 regenerates the AC power to the AC power supply 20 via the AC bus 18.

[0108] In addition, each charging and discharging unit 52 may only perform DC / DC conversion. In this case, a bidirectional AC / DC converter electrically connected to the AC power source 20 via the AC bus 18 electrically connects each charging and discharging unit 52 in parallel via a DC bus (not shown).

[0109] Any one of the charge and discharge units 52 is a master unit 52-1 (also referred to as a master converter), and the rest of the charge and discharge units 52 are slave units 52-2 (also referred to as slave converters). The master unit 52-1 charges and discharges the charge and discharge body 9 according to the charge and discharge instruction D3A input from the control unit 54, and outputs a parallel signal D3B including an I (Input) / O (Output) signal and a current reference signal (analog signal) to each slave unit 52-2. Each slave unit 52 charges and discharges the charge and discharge body 9 based on the parallel signal D3B input from the master unit 52. For example, when the master unit 52-1 outputs a direct current of 480A to the charge and discharge body 9, it issues a current output instruction of 120A to itself, and outputs a parallel signal D3B indicating that a current output of 120A is executed to the remaining three slave units 52-2.

[0110] In addition, instead of dividing each charge and discharge unit 52 into a master unit 52-1 and a plurality of slave units 52-2, all the charge and discharge units 52 may perform charge and discharge of the charge and discharge body 9 according to the charge and discharge command D3A directly input from the control unit 54. In addition, each charge and discharge test device 12 of the first embodiment and each DC / DC converter 122 of the second embodiment and the third embodiment may be divided into a master and a slave in the same manner as in this embodiment.

[0111] Although not shown in the figure, each charging and discharging unit 52 adopts a switching control method in which the magnitude of the output current is controlled by switching control of a switching element such as a FET.

[0112] The control unit 54 uses a PLC, or a combination of a PLC and a PC or a terminal other than a PC, similarly to the control unit 16 in the first to third embodiments. The control unit 54 is electrically connected to the main unit 52 - 1 .

[0113] The control unit 54 outputs a charge and discharge instruction D3A to the master unit 52-1 according to the charge and discharge mode of the charge and discharge body 9 (including the amount of current charged and discharged to the charge and discharge body 9) input in advance by the operator during the charge and discharge test of the charge and discharge body 9. As a result, the master unit 52-1 charges and discharges the charge and discharge body 9 according to the charge and discharge instruction D3A, and each slave unit 52-2 charges and discharges the charge and discharge body 9 based on the parallel signal D3B input from the master unit 52-1. That is, the same charge and discharge body 9 can be charged and discharged simultaneously by four charge and discharge units 52 (master unit 52-1, each slave unit 52-2). For example, when the maximum output current of each charge and discharge unit 52 is 120A, a current of 480A (=120A×4) can be charged and discharged to the same charge and discharge body 9 by each charge and discharge unit 52.

[0114] In addition, the control unit 54 outputs a switch synchronization signal SG for controlling the switch phase of each charge and discharge unit 52 (the switch element of each charge and discharge unit 52) ​​of the switch control method to each charge and discharge unit 52. Specifically, the control unit 54 outputs the switch synchronization signal SG to the master unit 52-1, and the switch synchronization signal SG is output to each slave unit 52-2 via the master unit 52-1. Thus, based on the switch synchronization signal SG across each charge and discharge unit 52, the phase of the switch of each charge and discharge unit 52 can be synchronized or phase-shifted.

[0115] Fig.12 1 is an explanatory diagram for explaining the problem of charging and discharging the same charging and discharging body 9 by each charging and discharging unit 52 of the switch control method. Fig.12 In order to avoid complicating the drawing, the AC bus 18 and the AC power source 20 are omitted.

[0116] When the phases of the switches of the charge and discharge units 52 are synchronized, the phases of the current pulsations Ri outputted from the charge and discharge units 52 are easily aligned. As a result, when the current pulsations Ri outputted from the charge and discharge units 52 are synthesized, the peak values ​​of the current pulsations Ri are superimposed to generate a synthesized current pulsation SRi (current noise) having a peak value of up to four times the peak value.

[0117] Therefore, the control unit 54 controls the phase of the switches of each charging and discharging unit 52 so as to reduce the combined current ripple SRi.

[0118] Fig.131 is an explanatory diagram for explaining the phase control of the switch of each charging and discharging unit 52 by the control unit 54. Fig.13 As shown, the control unit 54 makes the phases of the switches of the respective charge and discharge units 52 different from each other based on the switch synchronization signal SG.

[0119] Specifically, the control unit 54 sets the number of charge and discharge units 52 electrically connected in parallel to the same charge and discharge body 9 via the DC bus 56 to N (N is a natural number greater than 2), and shifts the phase of the switch of each charge and discharge unit 52 by 360° / N. Here, since N=4, the phase of the switch of each charge and discharge unit 52 is shifted by 90°. As a result, the phase of the current pulsation Ri output from each charge and discharge unit 52 can be shifted by 90°. For example, with respect to the phase of the current pulsation Ri output from the charge and discharge unit 52 (the master unit 52-1) indicated by the bracketed number (1), the phase of the current pulsation Ri output from each charge and discharge unit 52 (each slave unit 52-2) indicated by the bracketed numbers (2) to (4) is shifted by 90°, 180°, and 270°, respectively.

[0120] Thus, the phases of the current pulsations Ri output from the respective charge and discharge units 52 are shifted from each other, so that the positions of the peaks of the current pulsations Ri are shifted. As a result, the current pulsations Ri output from the respective charge and discharge units 52 cancel each other out, so that the combined current pulsation Sri is reduced.

[0121] As described above, in the charge and discharge test system 10 of the fourth embodiment, the combined current ripple SRi can be significantly reduced by shifting the switching phases of the charge and discharge units 52 of the switch control method by 360° / N.

[0122] In addition, in the fourth embodiment, the phases of the switches of the charge and discharge units 52 are shifted by 360° / N, but the combined current pulsation SRi can be reduced to a certain extent as long as the phases of the switches of the charge and discharge units 52 are not inconsistent. Therefore, the magnitude of the shift amount of the switch phases of the charge and discharge units 52 is not particularly limited, but by setting the shift amount to 360° / N as described in the second embodiment, the combined current pulsation SRi can be reduced to the maximum extent.

[0123] In the charge and discharge test system 10 of the fourth embodiment, the plurality of charge and discharge units 52 are electrically connected in parallel to one charge and discharge body 9 via the DC bus 56. Alternatively, the plurality of charge and discharge units 52 may be electrically connected in parallel to the plurality of charge and discharge bodies 9 via the DC bus 56 (see the above embodiment). Figure 3 3A).

[0124] [Fifth Embodiment]

[0125] Fig.14 FIG. 7 is a schematic diagram of a charge and discharge test system 70 according to a fifth embodiment. Fig.14 As shown in FIG. 1 , the charge-discharge test system 70 of the fifth embodiment includes a plurality of charge-discharge units 72 and a control unit 74. Here, the charge-discharge unit 72 may be, for example, a charge-discharge test device or a bidirectional DC / DC converter. In addition, when the charge-discharge unit 72 is a bidirectional DC / DC converter, as shown in FIG. Fig. 9 or Fig.10 As shown, a bidirectional AC / DC converter (not shown) is configured between the AC power source and the bidirectional DC / DC converter.

[0126] In the third embodiment, two charge-discharge units 72 are provided as indicated by the bracketed numbers (1) and (2), and charge and discharge the two charge-discharge bodies 9 (the test charge-discharge body 9-1 and the preliminary charge-discharge body 9-2) are performed under the control of the control unit 74 described later. In addition, the number of charge-discharge units 72 may be three or more.

[0127] One end of each charge and discharge unit 72 is electrically connected to the AC power source 20 via the AC bus 18 as in the first embodiment. The other end of each charge and discharge unit 72 is electrically connected to the charge and discharge body 9 via the DC bus 76.

[0128] Here, the test charge and discharge body 9-1 is electrically connected to the other end of one charge and discharge unit 72 via the DC bus 76, and the reserve charge and discharge body 9-2 is electrically connected to the other end of the other charge and discharge unit 72 via the DC bus 76. Hereinafter, the charge and discharge unit 72 electrically connected to the test charge and discharge body 9-1 via the DC bus 76 is appropriately referred to as the "test unit 72-1", and the charge and discharge unit 72 electrically connected to the reserve charge and discharge body 9-2 via the DC bus 76 is appropriately referred to as the "remaining unit 72-2". In addition, the test charge and discharge body 9-1 may be electrically connected to the other end of all the charge and discharge units 72 via the DC bus 76.

[0129] Each charge and discharge unit 72 has a configuration substantially the same as that of the charge and discharge test device 12 of the first embodiment described above. Each charge and discharge unit 72 performs AC / DC conversion to convert AC power input from the AC power source 20 via the AC bus 18 into DC power and DC / DC conversion to reduce the high voltage of the DC power, and then outputs the reduced DC power to the charge and discharge body 9 (test charge and discharge body 9-1, reserve charge and discharge body 9-2) via the DC bus 56.

[0130] In addition, each charging and discharging unit 72 performs DC / DC conversion to boost the low voltage of the DC power input from the charging and discharging body 9 and DC / AC conversion to convert the boosted DC power into AC power, and then regenerates the AC power to the AC power supply 20 or outputs it to other charging and discharging units 72 via the AC bus 18. In addition, each charging and discharging unit 72 may perform only DC / DC conversion.

[0131] The control unit 74 uses a PLC, or uses a configuration in which a PLC is combined with a PC or a terminal other than a PC, as in the above-mentioned embodiments. The control unit 54 is electrically connected to each of the charge and discharge units 72 .

[0132] The control unit 74 outputs a charge / discharge command to the test unit 72-1 based on the charge / discharge pattern of the test charge / discharge unit 9-1 input in advance by the operator. The test unit 72-1 then charges and discharges the test charge / discharge unit 9-1 according to the charge / discharge command.

[0133] At this time, the control unit 74 supplies power from the reserve charge / discharger 9-2 to the test charge / discharger 9-1 while charging the test charge / discharger 9-1. Thus, the power output from the reserve charge / discharger 9-2 via the DC bus 76 and the remaining unit 72 charges the test charge / discharger 9-1 via the AC bus 18, the test unit 72, and the DC bus 76.

[0134] Furthermore, on the contrary, the control unit 74 charges the reserve charge-discharge unit 9-2 while discharging the test charge-discharge unit 9-1. Thus, the power output from the test charge-discharge unit 9-1 via the DC bus 76 and the unit under test 72-1 charges the reserve charge-discharge unit 9-2 via the AC bus 18, the remaining unit 72-2, and the DC bus 76. Thus, the power supply from the AC power supply 20 can be reduced, or the surplus power regenerated in the AC power supply 20 can be reduced, so that the power use efficiency of the charge-discharge test system 70 can be improved.

[0135] The control unit 74 synchronizes the switching control of charging the charging and discharging body 9 (the testing charging and discharging body 9-1 or the reserve charging and discharging body 9-2) by one of the two charging and discharging units 72 (the unit under test 72-1 and the remaining unit 72-2) with the switching control of discharging the charging and discharging body 9 (the reserve charging and discharging body 9-2 or the testing charging and discharging body 9-1) by the other one.

[0136] For example, in Fig.14In the example shown, the control unit 74 synchronizes the switch control of the remaining unit 72-2 for discharging the preliminary charge-discharge body 9-2 with the switch control of the test unit 72-1 for charging the test charge-discharge body 9-1. As a result, the output (discharge) of the current pulsation Ri from the remaining unit 72-2 to the AC bus 18 side can be synchronized with the output (charging) of the current pulsation Ri from the test unit 72-1 to the DC bus 76 side. Therefore, the current pulsation Ri (output current pulsation) output from the remaining unit 72-2 can be reduced. By reducing the current pulsation Ri, it is possible to achieve a reduction in loss, a reduction in cable heating, and a longer life of the fuse.

[0137] [other]

[0138] The above-mentioned embodiments may be appropriately combined and implemented.

[0139] -Description of Reference Numerals-

[0140] 9…Charge and discharge body, 9-1…Test charge and discharge body, 9-2…Preparation charge and discharge body, 9a…Charge and discharge body, 10…Charge and discharge test system, 12…Charge and discharge test device, 12A…Remaining unit, 13…Measurement unit, 14…Switching circuit, 14a…Port, 14b…Port, 16…Control unit, 18…AC bus, 20…AC power supply, 30…Correction value acquisition control unit, 32…Charge and discharge test control unit, 34…Correction unit, 40…Charge and discharge test system, 42…Charge and discharge test system, 50…Charge and discharge test system, 52…Charge and discharge unit, 52-1 …master unit, 52-2…slave unit, 54…control unit, 56…DC bus, 70…charge and discharge test system, 72…charge and discharge unit, 72-1…unit under test, 72-2…remaining units, 74…control unit, 76…DC bus, 121…bidirectional AC / DC converter, 122…bidirectional DC / DC converter, D1…combination instruction signal, D2…correction condition switching instruction signal, D3…charge and discharge instruction, D3A…charge and discharge instruction, D3B…parallel signal, Ri…current pulsation, SG…switch synchronization signal, SRi…synthesized current pulsation.

Claims

1. A charge and discharge test system, characterized in that: have: A plurality of charging and discharging units for charging and discharging the charging and discharging body; a switching circuit capable of switching a combination of electrically connecting one or more of the charging and discharging units and one or more of the charging and discharging bodies; and The control unit controls the switching circuit to switch the combination.

2. The charge and discharge test system according to claim 1, wherein: The switching circuit can switch to a combination in which one or more of the charging and discharging units are electrically connected to the same charging and discharging body.

3. The charge and discharge test system according to claim 1 or 2, wherein: The charge and discharge test system comprises: A measuring unit, provided in each of the plurality of charge and discharge units, for measuring at least one of a voltage of the charge and discharge body and a current flowing through the charge and discharge unit; a correction value acquisition control unit that acquires, for each of the combinations, a correction value for correcting the measurement value of the measurement unit; as well as The correction unit selects the correction value corresponding to the combination of the switching circuits from the correction values ​​for each of the combinations acquired by the correction value acquisition control unit, and corrects the measurement value based on the selected correction value.

4. The charge and discharge test system according to claim 1 or 2, wherein: One ends of the plurality of charging and discharging units are electrically connected to each other via a bus, and the other ends of the plurality of charging and discharging units are connected to the switching circuit. The control unit controls the plurality of charging and discharging units electrically connected to the plurality of charging and discharging bodies via the switching circuit to control the charging and discharging of the plurality of charging and discharging bodies. The control unit charges the one or more chargeable charge / discharge bodies via the bus, the one or more charge / discharge bodies, and the switching circuit, with the electric power output from the one or more charge / discharge bodies that are discharging via the switching circuit and the charge / discharge unit.

5. The charge and discharge test system according to claim 4, wherein: When the plurality of charging and discharging bodies connected to the other end of the switching circuit respectively include one or more of the charging and discharging bodies that are the objects of the charging and discharging test, namely the test charging and discharging bodies, and the charging and discharging bodies that are different from the test charging and discharging bodies, namely the reserve charging and discharging bodies, the control unit switches the switching circuit to the combination that electrically connects the plurality of the charging and discharging units to the same reserve charging and discharging bodies.

6. A charge and discharge test system, characterized in that: have: A plurality of charging and discharging units are connected in parallel with the same charging and discharging body to charge and discharge the same charging and discharging body, and the magnitude of the output current is controlled by a switch control method; and The control unit makes the phases of the switches of the plurality of charging and discharging units different from each other.

7. The charge and discharge test system according to claim 6, wherein: When the number of the plurality of charge and discharge units is N, the control unit shifts the phase of the switch of each of the plurality of charge and discharge units by 360° / N, where N is a natural number greater than or equal to 2.

8. The charge and discharge test system according to claim 6 or 7, wherein: The plurality of charge and discharge units make the phases of the switches different from each other based on the synchronization signal input from the control unit.

Images