Charge / discharge test system and method for controlling charge / discharge test system

Abstract

The present invention is provided with: a bidirectional AC / DC converter (12) connected to an AC power supply (AC power supply (9)); an insulated bidirectional DC / DC converter (22), one end of which is connected to the first DC bus (14) and the other end of which is connected to the second DC bus (24); a plurality of non-insulated bidirectional DC / DC converters (26), one end of which is connected to the second DC bus (24) and the other end of which is connected to mutually different charge / discharge bodies (batteries (6)); and a charge / discharge control unit (ET control unit (28)) that charges the at least one charge / discharge body with power output from the at least one charge / discharge body via the non-insulated bidirectional DC / DC converter (26) via the second DC bus (24) and the at least one non-insulated bidirectional DC / DC converter (26).

Description

Technical Field

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

[0002] In recent years, hybrid vehicles, plug-in hybrid vehicles, and electric vehicles have been spreading. In order to spread these vehicles, the development of inexpensive drive batteries has become crucial. These batteries are different from consumer batteries such as portable batteries, and generally have a large capacity of several kW to several tens of kW. Therefore, the power for charging and discharging the batteries during battery development and mass production tests has become extremely large. In the future, as the above types of vehicles spread, the power for their charging and discharging will further increase. In addition, since multiple battery units are used in combination in the above types of vehicles, a charge-discharge test system that can test the charge and discharge of multiple battery units in parallel is required.

[0003] A charge-discharge test system includes, for example, a plurality of power supply devices each including a bidirectional AC (Alternating Current) / DC (Direct Current) converter and at least one bidirectional DC / DC converter (see, for example, Patent Document 1). One end of the bidirectional AC / DC converter of each power supply device is connected to an AC power supply via an AC bus, and the other end of the bidirectional AC / DC converter of each power supply device is connected to one end of at least one bidirectional DC / DC converter via a DC bus. In addition, a battery (charge-discharge body) to be subjected to a charge-discharge test is connected to the other end of the bidirectional DC / DC converter of each power supply device.

[0004] The bidirectional AC / DC converter converts AC power input from the AC power supply via the AC bus into DC power, and outputs the DC power to the bidirectional DC / DC converter via the DC bus. The bidirectional DC / DC converter controls the charge and discharge of the battery to be subjected to the charge-discharge test. Moreover, when discharging a certain battery among multiple batteries during the charge-discharge test, the power discharged from the battery is used for charging at least one other battery via the AC bus and at least one other power supply device (the bidirectional DC / DC converter, the DC bus, and the bidirectional AC / DC converter). Alternatively, the power discharged from the battery is regenerated from the power supply device via the AC bus to the AC power supply.

[0005] Prior Art Documents

[0006] Patent Documents

[0007] Patent Document 1: Japanese Patent Application Laid-Open No. 2012-154793 Summary of the Invention

[0008] -Problems to be Solved by the Invention-

[0009] However, in the case where the electric power discharged from the battery in the charge-discharge test is used for charging a battery connected to other at least one power supply device via an AC bus from a power supply device as described in the above Patent Document 1, it is necessary to sequentially perform DC / DC conversion, DC / DC to AC conversion, AC / DC conversion, and DC / DC conversion, and the number of power conversions increases (see Figure 9 ). As a result, the power loss consumed due to power conversion and the like increases during the period before the electric power discharged from the battery is used for charging other batteries, and thus the power use efficiency of the charge-discharge test system decreases.

[0010] In addition, it is necessary to increase the electric power supplied from the AC power supply during the charge-discharge test in consideration of this power loss, and it is necessary to increase the size of each converter corresponding to this increase in electric power. As a result, there are problems of an increase in the size and cost of the charge-discharge test system (see Figure 9 ).

[0011] The present invention has been made in view of such circumstances, and an object thereof is to provide a charge-discharge test system and a control method for the charge-discharge test system capable of achieving an improvement in power use efficiency, miniaturization, and cost reduction.

[0012] -Means for Solving the Problem-

[0013] A charge-discharge test system for achieving the object of the present invention is a charge-discharge test system for performing a charge-discharge test on a plurality of charge-discharge bodies, and the charge-discharge test system includes: a bidirectional AC / DC converter having one end connected to an AC power supply via an AC bus and the other end connected to a first DC bus; an isolated bidirectional DC / DC converter having one end connected to the bidirectional AC / DC converter via the first DC bus and the other end connected to a second DC bus; a plurality of non-isolated bidirectional DC / DC converters having one end connected to the isolated bidirectional DC / DC converter via the second DC bus and the other end connected to different charge-discharge bodies; and a charge-discharge control unit that controls the bidirectional AC / DC converter, the isolated bidirectional DC / DC converter, and the plurality of non-isolated bidirectional DC / DC converters, and controls the charge and discharge of the plurality of charge-discharge bodies respectively connected to the plurality of isolated bidirectional DC / DC converters. The charge-discharge control unit causes the electric power output from at least one charge-discharge body that performs discharge to be charged to at least one charge-discharge body that can be charged via the second DC bus and at least one non-isolated bidirectional DC / DC converter via the non-isolated bidirectional DC / DC converter.

[0014] According to this charge-discharge test system, energy sharing (ES) can be performed between the charge-discharge bodies respectively connected to the different non-isolated bidirectional DC / DC converters via the second DC bus 24.

[0015] In the charge-discharge test system according to another aspect of the present invention, when the discharge power, which is the power discharged from all the charge-discharge bodies undergoing discharge, is surplus with respect to the power required for charging all the charge-discharge bodies undergoing charging, i.e., the required charging power, the charge-discharge control unit regenerates the surplus power equivalent to the surplus amount of the discharge power from at least one non-insulated bidirectional DC / DC converter via the second DC bus, the insulated bidirectional DC / DC converter, the first DC bus, the bidirectional AC / DC converter, and the AC bus to the AC power supply. Thereby, the power regenerated to the AC power supply can be suppressed to the minimum, and thus the power utilization efficiency of the charge-discharge test system can be improved.

[0016] In the charge-discharge test system according to another aspect of the present invention, when the discharge power, which is the power discharged from all the charge-discharge bodies undergoing discharge, is insufficient with respect to the power required for charging all the charge-discharge bodies undergoing charging, i.e., the required charging power, the charge-discharge control unit charges at least one charge-discharge body with the supplementary power for supplementing the shortage amount of the discharge power from the AC power supply via the AC bus, the bidirectional AC / DC converter, the first DC bus, the insulated bidirectional DC / DC converter, the second DC bus, and at least one non-insulated bidirectional DC / DC converter. Thereby, the power supplemented from the AC power supply can be suppressed to the minimum, and thus the power utilization efficiency of the charge-discharge test system can be improved.

[0017] In the charge-discharge test system according to another aspect of the present invention, there is provided a power battery which is connected to the second DC bus and can be controlled for charge and discharge based on the charge-discharge control unit. When the discharge power, which is the power discharged from all the charge-discharge bodies undergoing discharge, is surplus with respect to the power required for charging all the charge-discharge bodies undergoing charging, i.e., the required charging power, the charge-discharge control unit charges the power battery with the surplus power equivalent to the surplus amount of the discharge power from at least one non-insulated bidirectional DC / DC converter via the second DC bus. Thereby, the power regenerated to the AC power supply can be suppressed to the minimum, and thus the power utilization efficiency of the charge-discharge test system can be improved.

[0018] In the charge-discharge test system according to another aspect of the present invention, when the surplus power exceeds the rechargeable capacity of the power battery, the charge-discharge control unit regenerates the power equivalent to the excess amount of the surplus power from the second DC bus via the insulated bidirectional DC / DC converter, the first DC bus, the bidirectional AC / DC converter, and the AC bus to the AC power supply. Thereby, the power regenerated to the AC power supply can be suppressed to the minimum, and thus the power utilization efficiency of the charge-discharge test system can be improved.

[0019] In the charge-discharge test system according to another aspect of the present invention, a plurality of power supply devices including an isolated bidirectional DC / DC converter, a second DC bus, a power battery, and a plurality of non-isolated bidirectional DC / DC converters are connected to a bidirectional AC / DC converter via a first DC bus. When the excess power generated in at least one power supply device exceeds the rechargeable capacity of the power battery, the charge-discharge control unit outputs power equivalent to the excess amount of the surplus power generated in the at least one power supply device to at least one other power supply device capable of inputting power via the first DC bus. Thereby, the power regenerated to the AC power supply can be suppressed to a minimum, and thus the power utilization efficiency of the charge-discharge test system can be improved.

[0020] In the charge-discharge test system according to another aspect of the present invention, a power battery is provided. The power battery is connected to the second DC bus and can be controlled for charge and discharge based on the charge-discharge control unit. When the discharge power, which is the power discharged from all the charge-discharge bodies performing discharge, is insufficient compared to the power required for charging all the charge-discharge bodies performing charging, i.e., the required charging power, the charge-discharge control unit causes supplementary power for supplementing the shortage of the discharge power to be charged from the power battery to at least one charge-discharge body via the second DC bus and at least one non-isolated bidirectional DC / DC converter. Thereby, the power supplemented from the AC power supply can be suppressed to a minimum, and thus the power utilization efficiency of the charge-discharge test system can be improved.

[0021] In the charge-discharge test system according to another aspect of the present invention, when the shortage amount of the dischargeable capacity of the power battery is insufficient compared to the discharge power, the charge-discharge control unit charges at least one charge-discharge body with power for supplementing the shortage amount of the dischargeable capacity from the AC power supply via the AC bus, the bidirectional AC / DC converter, the first DC bus, the isolated bidirectional DC / DC converter, the second DC bus, and at least one non-isolated bidirectional DC / DC converter. Thereby, the power supplemented from the AC power supply can be suppressed to a minimum, and thus the power utilization efficiency of the charge-discharge test system can be improved.

[0022] In the charge-discharge test system according to another aspect of the present invention, a plurality of power supply devices including an isolated bidirectional DC / DC converter, a second DC bus, a power battery, and a plurality of non-isolated bidirectional DC / DC converters are connected to a bidirectional AC / DC converter via a first DC bus. When the shortage amount of the dischargeable capacity of the power battery is insufficient compared to the discharge power in at least one power supply device, the charge-discharge control unit outputs power from at least one power supply device capable of outputting power to at least one power supply device generating the shortage of the dischargeable capacity via the first DC bus.

[0023] In the charge-discharge test system according to another aspect of the present invention, a plurality of power supply devices including an isolated bidirectional DC / DC converter, a second DC bus, and a plurality of non-isolated bidirectional DC / DC converters are connected to a bidirectional AC / DC converter via a first DC bus. When the power required for charging the charge-discharge body is insufficient in at least one power supply device and at least one power supply device is capable of supplying power to other power supply devices, the charge-discharge control unit supplies power from at least one power supply device capable of supplying power to at least one power supply device with insufficient power required for charging the charge-discharge body via the first DC bus. Thereby, the power supplemented from the AC power supply can be suppressed to the minimum, and thus the power usage efficiency of the charge-discharge test system can be improved.

[0024] In the charge-discharge test system according to another aspect of the present invention, the charge-discharge control unit synchronizes the timing of the charge-discharge test among different power supply devices. Thereby, power can be supplied from a power supply device with surplus power to a power supply device with insufficient power.

[0025] In the charge-discharge test system according to another aspect of the present invention, the charge-discharge control unit calculates the power required for charging based on the result of correcting the power required for charging all the charge-discharge bodies to be charged by increasing the power consumption of all the non-isolated bidirectional DC / DC converters corresponding to all the charge-discharge bodies to be charged. The charge-discharge control unit calculates the discharge power based on the result of correcting the power discharged from all the charge-discharge bodies to be discharged by reducing the power consumption of all the non-isolated bidirectional DC / DC converters corresponding to all the charge-discharge bodies to be discharged. Thereby, ES reflecting the power consumption of each non-isolated bidirectional DC / DC converter can be executed.

[0026] In the charge-discharge test system according to other aspects of the present invention, each of the plurality of non-isolated bidirectional DC / DC converters includes at least one in-test converter and a remaining converter. The in-test converter is connected to a charge-discharge body to be the object of the charge-discharge test, i.e., a test charge-discharge body, and the remaining converter is connected to a charge-discharge body different from the test charge-discharge body, i.e., a standby charge-discharge body. Thereby, the power usage efficiency of the charge-discharge test system can be improved, and further, the cost reduction of the charge-discharge test system can be achieved by using the standby charge-discharge body.

[0027] In the charge-discharge test system according to another aspect of the present invention, the charge-discharge control unit synchronizes the timing of discharging power from at least one charge-discharge body with the timing of charging power to at least one charge-discharge body. Thereby, ES can be executed.

[0028] In the control method of the charge and discharge test system for achieving the object of the present invention, the charge and discharge test system includes: a bidirectional AC / DC converter, one end of which is connected to an AC power supply via an AC bus, and the other end of which is connected to a first DC bus; an isolated bidirectional DC / DC converter, one end of which is connected to the bidirectional AC / DC converter via the first DC bus, and the other end of which is connected to a second DC bus; and a plurality of non-isolated bidirectional DC / DC converters, one end of each of which is connected to the isolated bidirectional DC / DC converter via the second DC bus, and the other end of each of which is connected to a different charge and discharge body. The bidirectional AC / DC converter, the isolated bidirectional DC / DC converter, and the plurality of non-isolated bidirectional DC / DC converters are controlled to control the charge and discharge of a plurality of charge and discharge bodies respectively connected to the plurality of non-isolated bidirectional DC / DC converters, so that the power output from at least one charge and discharge body performing discharge passes through the non-isolated bidirectional DC / DC converter, the second DC bus, and at least one non-isolated bidirectional DC / DC converter to charge at least one charge and discharge body capable of being charged.

[0029] -Advantages of the Invention-

[0030] The present invention can achieve an improvement in power utilization efficiency, miniaturization, and cost reduction. Brief Description of the Drawings

[0031] Figure 1 is a schematic diagram of the charge and discharge test system of the first embodiment.

[0032] Figure 2 is a block diagram of the power supply device of the first embodiment.

[0033] Figure 3 is an explanatory diagram showing an example of the charge and discharge mode for two batteries.

[0034] Figure 4 Symbol 4A is a graph showing an example of the charging mode of the battery, symbol 4B is a graph showing an example of the discharging mode of the battery, and symbol 4C is a graph showing the differential mode corresponding to the difference between the charging mode and the discharging mode.

[0035] Figure 5 is an explanatory diagram for explaining the charge and discharge control of two batteries in the case where there is no shortage or surplus of discharge power relative to the power required for charging.

[0036] Figure 6 is an explanatory diagram for explaining the charge and discharge control of two batteries 6 and the regeneration of surplus power in the case where there is a surplus of discharge power relative to the power required for charging.

[0037] Figure 7It is an explanatory diagram for explaining the charge-discharge control of two batteries 6 and the supply of supplementary power in the case where there is a shortage of discharge power relative to the power required for charging.

[0038] Figure 8 It is a flowchart showing the control method of the charge-discharge test system of the first embodiment, particularly the process of the charge-discharge test of two batteries 6 based on the charge-discharge test system 10.

[0039] Figure 9 It is an explanatory diagram for explaining the power usage efficiency of the charge-discharge test system of the comparative example.

[0040] Figure 10 It is an explanatory diagram for explaining the power usage efficiency of the charge-discharge test system of the first embodiment.

[0041] Figure 11 It is an explanatory diagram for explaining the operation of the differential mode of the ET control unit based on the second embodiment.

[0042] Figure 12 It is a block diagram of the charge-discharge test system of the third embodiment.

[0043] Figure 13 It is an explanatory diagram for explaining the use of the power cell ES and the regeneration of the surplus power to the AC power supply in the case where there is a surplus of discharge power relative to the power required for charging.

[0044] Figure 14 It is an explanatory diagram for explaining the use of the power cell ES and the supply of supplementary power from the AC power supply in the case where there is a shortage of discharge power relative to the required charging power.

[0045] Figure 15 It is a flowchart showing the process of the charge-discharge test of two batteries based on the charge-discharge test system of the third embodiment.

[0046] Figure 16 It is a block diagram of the charge-discharge test system of the fourth embodiment.

[0047] Figure 17 It is a block diagram of the charge-discharge test system of the fifth embodiment.

[0048] Figure 18 It is a block diagram of the charge-discharge test system of the sixth embodiment.

[0049] Figure 19 It is an explanatory diagram for explaining the ES between power supply devices and the regeneration of the surplus power to the AC power supply.

[0050] Figure 20 It is an explanatory diagram for explaining the ES between power supply devices and the supply of supplementary power from the AC power supply. Detailed implementation mode

[0051] [First implementation mode]

[0052] Figure 1 is a schematic diagram of the charge and discharge test system 10 of the first implementation mode. As Figure 1 shown, the charge and discharge test system 10 is provided on the production line 7 of the battery 6 and can perform charge and discharge tests on a plurality of batteries 6 on the production line 7 in parallel. In addition, the battery 6 corresponds to the charge and discharge body of the present invention and is, for example, various known secondary batteries such as lithium-ion batteries, nickel-metal hydride batteries, and all-solid-state batteries (in addition, it also includes energy storage devices such as supercapacitors with double-layer capacitors).

[0053] The charge and discharge test system 10 includes a bidirectional AC / DC converter 12, a first DC bus 14, a power supply device 16, and a main control device 18.

[0054] One end of the bidirectional AC / DC converter 12 is connected to the AC bus 8 and further connected to the AC power supply 9 (AC power supply) via the AC bus 8. In addition, the other end of the bidirectional AC / DC converter 12 opposite to one end is connected to the first DC bus 14 and further connected to the power supply device 16 via the first DC bus 14.

[0055] When supplying power to the power supply device 16, the bidirectional AC / DC converter 12 converts the AC power (or AC current) input from the AC power supply 9 via the AC bus 8 into DC power (or DC current) and outputs the DC power to the power supply device 16 via the first DC bus 14. In addition, the bidirectional AC / DC converter 12 converts the DC power (or DC current) input from the power supply device 16 via the first DC bus 14 into AC power (or AC current) and returns or outputs the AC power to the AC power supply 9 via the AC bus 8 (hereinafter simply referred to as "regeneration").

[0056] One end of the power supply device 16 is connected to the first DC bus 14 and further connected to the bidirectional AC / DC converter 12 via the first DC bus 14. In addition, the other end of the power supply device 16 opposite to one end is connected to two cables (not shown) and further connected to the connector 19 via the two cables.

[0057] The connector 19 electrically connects a plurality of cables to a plurality of, for example, two batteries 6 transported to a given test position on the production line 7. As a result, the other end of the power supply device 16 is electrically connected to the two batteries 6 on the production line 7 via each cable and the connector 19. As a result, charge and discharge tests can be performed on these two batteries 6. In addition, a plurality of batteries 6 on the production line 7 can be transported to the test position two by two in sequence to perform charge and discharge tests.

[0058] The power supply device 16 performs charging and discharging (charge-discharge test) on the two batteries 6 electrically connected to the power supply device 16 according to the charge-discharge modes of the two batteries 6 respectively set by the main control device 18 described later. In addition, when the power supply device 16 performs the charge-discharge test on the two batteries 6, it performs energy sharing (also referred to as power sharing) in which the electric power discharged from one of the two batteries 6 is used for charging the other of the two batteries 6. Hereinafter, energy sharing (Energy Sharing: ES) will be appropriately abbreviated as "ES".

[0059] The main control device 18 and the ET control unit 28 of the power supply device 16 described later (refer to Figure 2 ) together constitute the charge-discharge control unit of the present invention. As the main control device 18, a known control device such as a programmable logic controller (Programmable Logic Controller: PLC) is used, for example. The main control device 18 is electrically connected to the bidirectional AC / DC converter 12 and the power supply device 16. The main control device 18 controls the bidirectional AC / DC converter 12 and the power supply device 16 according to the charge-discharge modes of the two batteries 6 respectively input by the operator in advance, and performs the charge-discharge test on the two batteries 6.

[0060] The charge-discharge mode is determined according to the type of the battery 6 and the test purpose of the charge-discharge test. In addition, in the present embodiment, the types and test purposes of the two batteries 6 are common, and the charge-discharge modes set for the two batteries 6 are the same.

[0061] In addition, in the present embodiment, the case where the charge-discharge modes of the two batteries 6 can be directly input to the main control device 18 is taken as an example for description, but a setting unit (not shown) for setting the charge-discharge mode may be connected to the main control device 18. Examples of such a setting unit include a PC (Personal Computer), a terminal other than a PC, a portable terminal, or a tablet terminal.

[0062] Figure 2 is a block diagram of the power supply device 16 of the first embodiment. In addition, in Figure 2 , in order to prevent the complication of the drawings, the illustration of the production line 7 and the connection head 19 is omitted ( Figure 3 the same applies hereinafter). As Figure 2 shown, the power supply device 16 includes an isolated bidirectional DC / DC converter 22, a second DC bus 24, two non-isolated bidirectional DC / DC converters 26, and an ET (Energy Testing System) control unit 28.

[0063] One end of the isolated bidirectional DC / DC converter 22 is connected to the first DC bus 14, and is further connected to the bidirectional AC / DC converter 12 via the first DC bus 14. In addition, the other end of the isolated bidirectional DC / DC converter 22, which is opposite to one end, is connected to the second DC bus 24, and is further connected to one end of two non-isolated bidirectional DC / DC converters 26 via the second DC bus 24. Further, at the other end of the two non-isolated bidirectional DC / DC converters 26, which is opposite to one end, the batteries 6 are respectively connected via the aforementioned cable and the connector 19 (refer to Figure 1 ).

[0064] There is electrical insulation between one end and the other end of the isolated bidirectional DC / DC converter 22, and a coupling inductor provided between one end and the other end is used for power transmission between one end and the other end. The isolated bidirectional DC / DC converter 22 steps down the DC high voltage input from the first DC bus 14, and outputs it to the non-isolated bidirectional DC / DC converter 26 connected to the battery 6 to be charged via the second DC bus 24. In addition, the isolated bidirectional DC / DC converter 22 steps up the DC voltage input from the non-isolated bidirectional DC / DC converter 26 via the second DC bus 24, and outputs it to the bidirectional AC / DC converter 12 via the first DC bus 14.

[0065] Different from the isolated bidirectional DC / DC converter 22, there is no electrical insulation between one end and the other end of the non-isolated bidirectional DC / DC converter 26, and a transformer is used. Therefore, the non-isolated bidirectional DC / DC converter 26 is miniaturized and has a lower cost compared with the isolated bidirectional DC / DC converter 22.

[0066] When the non-isolated bidirectional DC / DC converter 26 charges the battery 6, it steps down the DC voltage input from the isolated bidirectional DC / DC converter 22 or another non-isolated bidirectional DC / DC converter 26 via the second DC bus 24 to a DC low voltage appropriate for the battery 6 for charging the battery 6. In addition, when the non-isolated bidirectional DC / DC converter 26 discharges the battery 6, it steps up the DC low voltage output from the battery 6 to a DC voltage, and outputs it to the isolated bidirectional DC / DC converter 22 or another non-isolated bidirectional DC / DC converter 26 via the second DC bus 24.

[0067] In addition, although not shown in the drawings, a detection unit is provided in each non-insulated bidirectional DC / DC converter 26. The detection unit continuously detects the charge amount of the connected battery 6, the current power consumption used for charging the battery 6 to be charged, and the current discharge power discharged from the battery 6 to be discharged. The detection results of the charge amount of the battery 6 by the detection unit and the detection results of the power consumption or the discharge power are sequentially output to the main control device 18 and the ET control unit 28.

[0068] The ET control unit 28 is a known control device such as a PLC, and functions as the charge and discharge control unit of the present invention together with the main control device 18. The ET control unit 28 controls the insulated bidirectional DC / DC converter 22 and the two non-insulated bidirectional DC / DC converters 26 according to the charge and discharge modes of the two batteries 6 input from the main control device 18, thereby controlling the charge and discharge of the two batteries 6 during the charge and discharge test.

[0069] In addition, when the ET control unit 28 performs the charge and discharge control of the two batteries 6, it performs ES in which the power discharged from one of the two batteries 6 is used for charging the other of the two batteries 6. In this ES, the power discharged from one of the two batteries 6 is used to charge the other of the two batteries 6 via one of the two non-insulated bidirectional DC / DC converters 26, the second DC bus 24, and the other of the two non-insulated bidirectional DC / DC converters 26. Thus, in the present embodiment, by connecting a plurality of, for example, two non-insulated bidirectional DC / DC converters 26 to the insulated bidirectional DC / DC converter 22 via the second DC bus 24, ES via the second DC bus 24 and the two non-insulated bidirectional DC / DC converters 26 can be performed.

[0070] Figure 3 It is an explanatory diagram showing an example of the charge and discharge mode for the two batteries 6. In addition, Figure 3 the horizontal axis in is time (t). As Figure 3 shown, in the charge and discharge test for the two batteries 6 (battery No1 and battery No2 in the figure), charging according to the charging mode P1 and discharging according to the discharging mode P2 are repeatedly performed multiple times (or can be performed once) for each battery 6. In addition, the charging mode P1 and the discharging mode P2 are not limited to the same mode each time, and can be appropriately changed.

[0071] The ET control unit 28 synchronizes the charging timing for charging one of the two batteries 6 in accordance with the charging mode P1 with the discharging timing for discharging the other of the two batteries 6 in accordance with the discharging mode P2 in order to execute the above-described ES. That is, when charging one of the two batteries 6 in accordance with the charging mode P1, the ET control unit 28 discharges the other of the two batteries 6 in accordance with the discharging mode P2. Conversely, when charging the other of the two batteries 6 in accordance with the charging mode P1, the ET control unit 28 discharges one of the two batteries 6 in accordance with the discharging mode P2.

[0072] Figure 4 Symbol 4A is a graph showing an example of the charging mode P1 of the battery 6, symbol 4B is a graph showing an example of the discharging mode P2 of the battery 6, and symbol 4C is a graph showing the differential mode P3 corresponding to the difference between the charging mode P1 and the discharging mode P2. In addition, Figure 4 the positive value (W) on the vertical axis of each graph in represents the magnitude of the power (current) for charging the battery 6, and the negative value (-W) on the vertical axis of each graph represents the magnitude of the power (current) discharged from the battery 6. Furthermore, Figure 4 the horizontal axis of each graph in is time (t).

[0073] As Figure 4 shown by symbols 4A and 4B in, the charging mode P1 represents the time change of the power required for charging, that is, the charging required power, of all (here, one) of the batteries 6 being charged, and the discharging mode P2 represents the time change of the power discharged, for example, the discharging power of all of the batteries 6 being discharged, such as one battery 6. In addition, as will be described later Figure 16 shown, when the power supply device 16 controls the charging and discharging of three or more batteries 6, the combined charging mode obtained by combining the charging modes P1 of two or more of all the batteries 6 being charged represents the time change of the "charging required power". In addition, the combined discharging mode obtained by combining the discharging modes P2 of two or more of all the batteries 6 being discharged represents the time change of the "discharging power".

[0074] As Figure 4 shown by symbol 4C in, the ET control unit 28 is as described above Figure 3When the charging timing of one of the two batteries 6 is synchronized with the discharging timing of the other of the two batteries 6 as shown, a differential mode P3 corresponding to the difference between the charging mode P1 and the discharging mode P2 is calculated. Then, based on the calculation result of the differential mode P3, the ET control unit 28 repeatedly executes a determination process (hereinafter simply referred to as the "determination process") for determining whether there is a shortage (reference symbol R1) or surplus (reference symbol R2) of the current discharging power with respect to the current required charging power during the execution of the charge-discharge test. Based on the result of the determination process, the ET control unit 28 controls the charge and discharge of the two batteries 6 so as to preferentially execute ES.

[0075] Figure 5 FIG. is an explanatory diagram for explaining the charge-discharge control of the two batteries 6 when there is no shortage or surplus of the discharging power with respect to the required charging power. In addition, Figure 5 represents an ideal state assuming that the power consumed for power conversion by each non-insulated bidirectional DC / DC converter 26 is zero.

[0076] Hereinafter, the battery 6 that is charged in accordance with the charging mode P1 is appropriately referred to as "battery 6-1", and the battery 6 that is discharged in accordance with the discharging mode P2 is appropriately referred to as "battery 6-2". In addition, the non-insulated bidirectional DC / DC converter 26 electrically connected to the battery 6-1 is appropriately referred to as "non-insulated bidirectional DC / DC converter 26-1", and the non-insulated bidirectional DC / DC converter 26 electrically connected to the battery 6-2 is appropriately referred to as "non-insulated bidirectional DC / DC converter 26-2".

[0077] As Figure 5 shown, when there is no shortage or surplus of the discharging power with respect to the required charging power based on the result of the determination process, the ET control unit 28 controls the two non-insulated bidirectional DC / DC converters 26 to execute only ES. Thus, the power output from the battery 6-2 via the non-insulated bidirectional DC / DC converter 26-2 is used for charging the battery 6-1 via the second DC bus 24 and the non-insulated bidirectional DC / DC converter 26-1.

[0078] Figure 6 FIG. is an explanatory diagram for explaining the charge-discharge control of the two batteries 6 and the regeneration of surplus power when there is a surplus of the discharging power with respect to the required charging power. As Figure 6 shown, when there is a surplus of the discharging power with respect to the required charging power based on the result of the determination process, the ET control unit 28 controls the insulated bidirectional DC / DC converter 22 and each non-insulated bidirectional DC / DC converter 26 to execute ES and output the surplus power to the bidirectional AC / DC converter 12.

[0079] Specifically, for the power in the discharge power that corresponds to the power required for charging, the ET control unit 28 performs ES by controlling the two non-insulated bidirectional DC / DC converters 26, and thus uses it for charging the battery 6-1. In addition, for the remaining power corresponding to the surplus of the discharge power with respect to the power required for charging, the ET control unit 28 controls the non-insulated bidirectional DC / DC converter 26 and the insulated bidirectional DC / DC converter 22 and outputs it to the bidirectional AC / DC converter 12. Thereby, the remaining power is input from the battery 6-2 to the bidirectional AC / DC converter 12 via the non-insulated bidirectional DC / DC converter 26-2, the second DC bus 24, the insulated bidirectional DC / DC converter 22, and the first DC bus 14.

[0080] When there is a surplus of discharge power based on the determination process of the ET control unit 28, the main control device 18 operates the bidirectional AC / DC converter 12. The bidirectional AC / DC converter 12 converts the surplus power (DC power) input from the power supply device 16 via the first DC bus 14 into AC power and then regenerates it to the AC power supply 9 via the AC bus 8 (reference sign RE).

[0081] Figure 7 It is an explanatory diagram for explaining the charge and discharge control of the two batteries 6 and the supply of supplementary power when there is a shortage of discharge power with respect to the power required for charging. As Figure 7 shown, when there is a shortage of discharge power based on the determination process of the ET control unit 28, the main control device 18 operates the bidirectional AC / DC converter 12. The bidirectional AC / DC converter 12 receives the supply of supplementary power (AC power) for supplementing the shortage of discharge power from the AC power supply 9 via the AC bus 8, converts the supplementary power into DC power, and then outputs it to the insulated bidirectional DC / DC converter 22 via the first DC bus 14 (reference sign SU). In addition, in the supplementary power, in addition to the shortage part of the discharge power, it also includes the power consumed by the power conversion of the bidirectional AC / DC converter 12, the insulated bidirectional DC / DC converter 22, and the non-insulated bidirectional DC / DC converter 26-2.

[0082] When there is a shortage of discharge power with respect to the power required for charging based on the result of the determination process, the ET control unit 28 controls the insulated bidirectional DC / DC converter 22 and each non-insulated bidirectional DC / DC converter 26 to perform ES and charge the battery 6-1 using the supplementary power.

[0083] Specifically, the ET control unit 28 controls each non-insulated bidirectional DC / DC converter 26, and executes ES in which all the discharge power discharged from the battery 6-2 is charged to the battery 6-1 via the non-insulated bidirectional DC / DC converter 26-2, the second DC bus 24, and the non-insulated bidirectional DC / DC converter 26-1.

[0084] In addition, the ET control unit 28 controls the insulated bidirectional DC / DC converter 22 and the non-insulated bidirectional DC / DC converter 26-1, and supplies supplementary power from the insulated bidirectional DC / DC converter 22 to the second DC bus 24 (reference sign SU), whereby the supplementary power is charged to the battery 6-1 via the non-insulated bidirectional DC / DC converter 26-1. Hereinafter, the supplementary power for charging the battery 6-1 supplemented from the AC power supply 9 as shown below Figure 7 is referred to as "supplementary power supply".

[0085] [Operation of the charge and discharge test system of the first embodiment]

[0086] Figure 8 is a flowchart showing the control method of the charge and discharge test system 10 of the first embodiment, particularly the process of the charge and discharge test of the two batteries 6 based on the charge and discharge test system 10.

[0087] As Figure 8 shown, first, the operator sets a charge and discharge mode (charge mode P1 and discharge mode P2) corresponding to the type of the battery 6 on the production line 7 and the test purpose in the main control device 18 (step S1). The main control device 18 outputs the information of the input charge and discharge mode to the ET control unit 28.

[0088] When the two batteries 6 on the production line 7 are transported to a given test position, the two batteries 6 are electrically connected to the two non-insulated bidirectional DC / DC converters 26 via the connectors 19 and the like. Then, the main control device 18 and the ET control unit 28 start the charge and discharge test for the two batteries 6 (step S2). In addition, to prevent complication of the description, the two batteries 6 are in a rechargeable and dischargeable state, that is, the charge amount is neither zero nor full charge.

[0089] The ET control unit 28 starts the charging of the battery 6-1 and the discharging of the battery 6-2 synchronously in order to preferentially execute ES, as shown above. Figure 3 At this time, as shown above, the ET control unit 28 calculates the differential mode P3 based on the charge mode P1 and the discharge mode P2, and performs a determination process of determining whether there is a surplus or shortage of the current discharge power with respect to the current required charging power based on the differential mode P3 (step S3). Figure 4

[0090] When there is no shortage of discharge power relative to the power required for charging and the above-mentioned ideal state remains, as described above, Figure 5 the ET control unit 28 controls each non-insulated bidirectional DC / DC converter 26 as shown and only executes ES (No in steps S4 and S5, step S6). In this way, by using the power discharged from the battery 6-2 for charging the battery 6-1 via the non-insulated bidirectional DC / DC converter 26-2, the second DC bus 24, and the non-insulated bidirectional DC / DC converter 26-1, the power utilization efficiency of the charge-discharge test system 10 can be improved.

[0091] When there is a surplus of discharge power relative to the power required for charging (Yes in step S4), as described above, Figure 6 the ET control unit 28 executes "ES" as shown, and further executes "regeneration of surplus power" (step S7) together with the main control device 18. Thus, ES is preferentially executed, and only the surplus power is input from the battery 6-2 to the bidirectional AC / DC converter 12 via the non-insulated bidirectional DC / DC converter 26-2, the second DC bus 24, the insulated bidirectional DC / DC converter 22, and the first DC bus 14. And this surplus power (DC power) is converted into AC power by the bidirectional AC / DC converter 12 and then regenerated to the AC power supply 9 via the AC bus 8. In this way, even when there is surplus power, by preferentially executing ES, the surplus power regenerated in the AC power supply 9 can be minimized. As a result, the power utilization efficiency of the charge-discharge test system 10 can be improved.

[0092] When there is a shortage of discharge power relative to the power required for charging (No in step S4, Yes in step S5), as described above, Figure 7 the ET control unit 28 executes "ES" as shown, and executes "supplementary power supply" (step S8) together with the main control device 18. Thus, ES is preferentially executed, and the supplementary power (AC power) for supplementing the shortage of power insufficient in this ES is input from the AC power supply 9 to the bidirectional AC / DC converter 12 via the AC bus 8. And this supplementary power is converted into DC power by the bidirectional AC / DC converter 12 and then used to charge the battery 6-1 via the first DC bus 14, the insulated bidirectional DC / DC converter 22, the second DC bus 24, and the non-insulated bidirectional DC / DC converter 26-1. In this way, even when there is a shortage of discharge power relative to the power required for charging, by preferentially executing ES, the supplementary power supplemented from the AC power supply 9 can be minimized. As a result, the power utilization efficiency of the charge-discharge test system 10 can be improved.

[0093] Hereinafter, during the period before the charge and discharge tests of the two batteries 6 are completed, the processes after the above-described step S3 are repeatedly executed (No in step S9). Then, when the charge and discharge tests of the two batteries 6 are completed (Yes in step S9), two new batteries 6 on the production line 7 are transported to the test position, and thus the processes after the above-described step S2 are repeatedly executed.

[0094] Figure 9 FIG. is an explanatory diagram showing the power usage efficiency of the charge and discharge test system 100 for the comparative example. Figure 10 FIG. is an explanatory diagram showing the power usage efficiency of the charge and discharge test system 10 of the first embodiment.

[0095] In addition, in Figure 9 and Figure 10 , the bidirectional AC / DC converter 12 is illustrated as "AC / DC", the isolated bidirectional DC / DC converters 22 and 104 are illustrated as "isolated DC / DC", and the non-isolated bidirectional DC / DC converter 26 is illustrated as "non-isolated DC / DC". Further, Figure 9 and Figure 10 the "efficiency X%" (where X is an arbitrary integer) described below each converter in

[0096] As Figure 9 shown, the charge and discharge test system 100 of the comparative example includes two power supply devices 102 provided separately for every two batteries 6. Further, the AC bus 8 of the charge and discharge test system 100 includes two AC buses 8a and 8b for electrically connecting the two power supply devices 102 to the AC power supply 9, respectively. In addition, in the following description, for the purpose of preventing complication of the description, the AC bus 8 and the AC buses 8a and 8b are collectively referred to as "AC bus 8".

[0097] The two power supply devices 102 include a bidirectional AC / DC converter 12, a first DC bus 14, and an isolated bidirectional DC / DC converter 104.

[0098] One end of each bidirectional AC / DC converter 12 is connected to the AC bus 8, and further connected to the AC power supply 9 via the AC bus 8. In addition, the other end of each bidirectional AC / DC converter 12 is respectively connected to the isolated bidirectional DC / DC converter 104 via the first DC bus 14. Each bidirectional AC / DC converter 12 converts the AC power input from the AC power supply 9 via the AC bus 8 into DC power, and outputs the DC power to the isolated bidirectional DC / DC converter 104 via the first DC bus 14. In addition, each bidirectional AC / DC converter 12 converts the surplus power (DC power) input from the isolated bidirectional DC / DC converter 104 via the first DC bus 14 into AC power, and outputs it to the AC power supply 9 via the AC bus 8.

[0099] One end of the isolated bidirectional DC / DC converter 104 is connected to the isolated bidirectional DC / DC converter 104 via the first DC bus 14, and the other end of the isolated bidirectional DC / DC converter 104 on the side opposite to the one end is connected to the battery 6 via a cable and a connector 19 (see Figure 1 ). The isolated bidirectional DC / DC converter 104 is basically the same as the isolated bidirectional DC / DC converter 22 except for the conversion efficiency. The isolated bidirectional DC / DC converter 104 steps down the DC voltage input via the first DC bus 14 and outputs it to the battery 6 via a cable or the like. Conversely, it steps up the DC voltage input from the battery 6 via a cable or the like and outputs it to the bidirectional AC / DC converter 12 via the first DC bus 14.

[0100] In addition, the isolated bidirectional DC / DC converter 104 connected to the battery 6-1 is appropriately referred to as "isolated bidirectional DC / DC converter 104-1", and the isolated bidirectional DC / DC converter 104 connected to the battery 6-2 is appropriately referred to as "isolated bidirectional DC / DC converter 104-2". In addition, the bidirectional AC / DC converter 12 connected to the isolated bidirectional DC / DC converter 104-1 via the first DC bus 14 is appropriately referred to as "bidirectional AC / DC converter 12-1", and the bidirectional AC / DC converter 12 connected to the isolated bidirectional DC / DC converter 104-2 via the first DC bus 14 is appropriately referred to as "bidirectional AC / DC converter 12-2".

[0101] In the case of performing ES in the charge and discharge test system 100 of the comparative example, the power discharged from the battery 6-2 is used to charge the battery 6-1 via the isolated bidirectional DC / DC converter 104-2, the first DC bus 14, the bidirectional AC / DC converter 12-, the AC bus 8, the bidirectional AC / DC converter 12-, the first DC bus 14, and the isolated bidirectional DC / DC converter 104-1.

[0102] In the case of performing such ES, when the magnitude of the power (current) discharged from the battery 6-2 is represented by the numerical value "-100" and the magnitude of the power (current) required for charging the battery 6-1 is represented by the numerical value "100", the supplementary power to be supplemented from the AC power supply 9 is described. In addition, the unit of the numerical value is set to "kW" here, but it can also be "kA", for example.

[0103] The power "-100 kW" (reference sign D1) discharged from the battery 6-2 is reduced to the power "-80 kW" (=-100 kW × 0.8) shown by the reference sign D2 through DC / DC conversion by the isolated bidirectional DC / DC converter 104-2 (efficiency 80%). Further, this power "-80 kW" is reduced to the power "-72 kW" (=-80 kW × 0.9) shown by the reference sign D3 through DC / AC conversion by the isolated bidirectional DC / DC converter 104-2 (efficiency 90%).

[0104] On the other hand, in order to charge the battery 6-1 with a power of "100 kW" (reference sign C1), it is necessary to input the power "125 kW" ( = 100 kW / 0.8) shown by the reference sign C2 to the isolated bidirectional DC / DC converter 104-1 (efficiency 80%). Further, in order to input the power "125 kW" to the isolated bidirectional DC / DC converter 104-1 from the bidirectional AC / DC converter 12-1 via the first DC bus 14, it is necessary to input the power "139 kW" ( = 125 kW / 0.9) shown by the reference sign C3 to the bidirectional AC / DC converter 12-1 (efficiency 90%). Therefore, in order to charge the battery 6-1 with a power of "100 kW", it is necessary to ensure a power of "-139 kW".

[0105] In the charge-discharge test system 100 of the comparative example, the power that can be supplemented by ES is "-72 kW". Therefore, in order to ensure the power "-139 kW" required for charging the battery 6-1, it is necessary to supplement the power "-67 kW" shown by the reference sign D4 [=-139 kW - (-72 kW)] from the AC power supply 9.

[0106] In contrast, in the Figure 10 ES performed in the charge-discharge test system 10 of the first embodiment shown, the power discharged from the battery 6-2 is used to charge the battery 6-1 via the non-isolated bidirectional DC / DC converter 26-2, the second DC bus 24, and the isolated bidirectional DC / DC converter 104-1. Therefore, the power "-93 kW" (=-100 kW × 0.93) shown by the reference sign D2 after removing the power consumed by the non-isolated bidirectional DC / DC converter 26- (efficiency 93%) from the power "-100 kW" (reference sign D1) discharged from the battery 6-2 can be supplemented by ES.

[0107] On the other hand, in order to charge the battery 6-1 with a charging power of "100 kW" (reference symbol C1), it is necessary to input the power of "108 kW" (≈100 kW / 0.93) shown by reference symbol C2 to the non-insulated bidirectional DC / DC converter 26-1 (efficiency 93%). Here, in the first embodiment, the power of "-93 kW" can be supplemented by the ES. Therefore, in order to charge the battery 6-1 with a charging power of "100 kW", it is only necessary to supplement the power of "15 kW" (=108 kW - 93 kW) shown by reference symbol C3 from the insulated bidirectional DC / DC converter 22 via the second DC bus 24 to the non-insulated bidirectional DC / DC converter 26-2.

[0108] Furthermore, in order to supplement the non-insulated bidirectional DC / DC converter 26-1 with a power of "15 kW", it is necessary to input the power of "15.7 kW" (≈15 kW / 0.95) shown by reference symbol C4 from the bidirectional AC / DC converter 12 via the first DC bus 14 to the insulated bidirectional DC / DC converter 22 (efficiency 95%). Moreover, in order to input the power of "15.7 kW" to the insulated bidirectional DC / DC converter 22, it is necessary to input the power of "17 kW" (≈15.7 kW / 0.9) shown by reference symbol C5 from the AC power supply 9 via the AC bus 8 to the bidirectional AC / DC converter 12 (efficiency 90%).

[0109] Therefore, in the charge and discharge test system 10 of the first embodiment, in order to charge the battery 6-1 with a charging power of "100 kW", it is necessary to supplement the power of "-17 kW" shown by reference symbol D3 from the AC power supply 9. In this way, in the first embodiment, compared with the comparative example, the power supplemented from the AC power supply 9 can be significantly reduced, so the power usage efficiency is significantly improved.

[0110] In addition, in Figure 9 In the charge and discharge test system 100 of the comparative example shown, the bidirectional AC / DC converter 12-1 needs to handle the AC / DC conversion of the power of "139 kW" (reference symbol C3), so it is necessary to use a bidirectional AC / DC converter 12 equipped with a transformer of 140 kW level for each power supply device 102. Furthermore, in the charge and discharge test system 100 of the comparative example, the insulated bidirectional DC / DC converter 104-1 needs to handle the DC / DC conversion of the power of "125 kW" (reference symbol C2), so it is necessary to use an insulated bidirectional DC / DC converter 104 equipped with a transformer of 130 kW level for each power supply device 102.

[0111] In contrast, in Figure 10In the charge-discharge test system 10 of the first embodiment shown, the bidirectional AC / DC converter 12 only needs to be able to handle the AC / DC conversion of power “17 kW” (reference sign C5), and a bidirectional AC / DC converter 12 equipped with a 20 kW-class transformer can be used. In addition, in the charge-discharge test system 10 of the first embodiment, the isolated bidirectional DC / DC converter 22 only needs to be able to handle the DC / DC conversion of power “15.7 kW” (reference sign C4), and an isolated bidirectional DC / DC converter 22 equipped with a 20 kW-class transformer can be used. Furthermore, in the charge-discharge test system 10 of the first embodiment, the non-isolated bidirectional DC / DC converter 26-1 needs to handle the DC / DC conversion of power “108 kW” (reference sign C2), so two non-isolated bidirectional DC / DC converters 26 corresponding to the 110 kW-class processing need to be used. However, since the non-isolated bidirectional DC / DC converter 26 does not have a transformer, miniaturization and cost reduction can be achieved.

[0112] In this way, in the charge-discharge test system 10 of the first embodiment, different from the comparative example, a 20 kW-class bidirectional AC / DC converter 12 and a non-isolated bidirectional DC / DC converter 26 can be used, and furthermore, two non-isolated bidirectional DC / DC converters 26 without a transformer can be used. Therefore, miniaturization and cost reduction can be achieved compared with the comparative example.

[0113] As described above, in the charge-discharge test system 10 of the first embodiment, the non-isolated bidirectional DC / DC converters 26 are electrically connected via the second DC bus 24, and ES between the batteries 6 respectively electrically connected to the non-isolated bidirectional DC / DC converters 26 can be achieved. Thereby, improvement in power usage efficiency, miniaturization, and cost reduction can be achieved.

[0114] [Second Embodiment]

[0115] Next, the charge-discharge test system 10 of the second embodiment will be described. The ET control unit 28 of the charge-discharge test system 10 of the first embodiment described above calculates the differential mode P3 as described above Figure 4 and performs determination processing based on the differential mode P3, thereby controlling the charge and discharge of the two batteries 6. At this time, as described above Figure 10 and so on, power is consumed in the DC / DC conversion based on each non-isolated bidirectional DC / DC converter 26. Therefore, the power discharged from the battery 6-2 reduces the amount of power consumed by the non-isolated bidirectional DC / DC converter 26-2, and the power charged to the battery 6-1 also reduces the amount of power consumed by the non-isolated bidirectional DC / DC converter 26-1.

[0116] Therefore, as Figure 11As shown, the ET control unit 28 of the charge-discharge test system 10 of the second embodiment calculates the differential mode P3A taking into account the power consumed by each non-insulated bidirectional DC / DC converter 26. Figure 11 It is an explanatory diagram for explaining the calculation of the differential mode P3A by the ET control unit 28 based on the second embodiment. In addition, the charge-discharge test system 10 of the second embodiment has substantially the same structure as the charge-discharge test system 10 of the first embodiment described above, except that the calculation method of the differential mode P3A based on the ET control unit 28 is different. Therefore, parts that are the same in function or structure as those of the first embodiment are denoted by the same reference numerals and their description is omitted.

[0117] As shown by reference signs XIA1 and XIA2, the ET control unit 28 of the second embodiment corrects the charging mode P1 to increase the amount of power consumed by the non-insulated bidirectional DC / DC converter 26 (26-1) to generate the charging mode P1A. In addition, as shown by reference signs XIB1 and XIB2, the ET control unit 28 corrects the discharging mode P2 to reduce the amount of power consumed by the non-insulated bidirectional DC / DC converter 26 (26) to generate the discharging mode P2A.

[0118] Moreover, as shown by reference sign XIC, the ET control unit 28 calculates the differential mode P3A corresponding to the difference between the charging mode P1A and the discharging mode P2A, and performs the above-described determination process based on the differential mode P3A. Thereby, it is possible to determine the presence or absence of a shortage or surplus of the discharging power with respect to the power required for charging, taking into account the amount of power consumed by each non-insulated bidirectional DC / DC converter 26. The subsequent processing is the same as that of the first embodiment described above, and thus the specific description is omitted.

[0119] As described above, in the second embodiment, the charging mode P1 and the discharging mode P2 are corrected corresponding to the amount of power consumed by each non-insulated bidirectional DC / DC converter 26, and thus it is possible to execute the ES reflecting these consumed amounts of power.

[0120] [Third Embodiment]

[0121] Figure 12 It is a block diagram of the charge-discharge test system 10 of the third embodiment. In the charge-discharge test system 10 of each of the above embodiments, when there is a surplus of the discharging power with respect to the power required for charging, "regeneration of surplus power" to the AC power supply 9 is executed. On the contrary, when there is a shortage of the discharging power with respect to the power required for charging, "supply of supplementary power" from the AC power supply 9 is executed. In contrast, in the charge-discharge test system 10 of the third embodiment, it is possible to use the power battery 40 to execute charging of the surplus power and discharging of the supplementary power.

[0122] As Figure 12 shown, the charge / discharge test system 10 of the third embodiment has substantially the same structure as the charge / discharge test systems 10 of the above-described embodiments, except that the power supply device 16 includes the power battery 40 (also referred to as the energy battery), and the second DC bus 24 includes the second DC bus 24a. Therefore, parts that are the same in function or structure as those of the above-described embodiments are denoted by the same reference numerals and their description is omitted.

[0123] The power battery 40 is electrically connected to each non-insulated bidirectional DC / DC converter 26 and the insulated bidirectional DC / DC converter 22 via the second DC bus 24a and the second DC bus 24. In the following description, in order to prevent complication of the description, the second DC bus 24 and the second DC bus 24a are collectively referred to as the "second DC bus 24".

[0124] The power battery 40 is not particularly limited as long as it is a device such as a lithium ion capacitor or various batteries that can be controlled for charging and discharging by the ET control unit 28. In addition, the power battery 40 may also include the remaining converter 26-3 and the standby battery 6B shown later. In addition, in Figure 17 shown, the power battery 40 is provided inside the power supply device 16, but it may also be provided outside the power supply device 16. Figure 12 In

[0125] In addition to the function of controlling the charging and discharging of the power battery 40, the ET control unit 28 of the third embodiment also has the function of continuously detecting the current charge amount (dischargeable capacity) and rechargeable capacity of the power battery 40, the current power consumption used for charging the power battery 40, and the current discharge power discharged from the power battery 40. Then, based on the result of the determination process executed in the same manner as in the above-described embodiments, the ET control unit 28 controls the charging and discharging of the two batteries 6 and the power battery 40, executes the above-described ES, or executes the "power battery use ES". Here, the power battery use ES means executing "charging the remaining power of the power battery 40" or "discharging the supplementary power from the power battery 40" together with the ES.

[0126] Figure 13 is an explanatory diagram for explaining the power battery use ES and the regeneration of the remaining power to the AC power supply 9 when there is a surplus of discharge power relative to the power required for charging. As Figure 13 shown, when there is a surplus of discharge power relative to the power required for charging based on the result of the determination process, the ET control unit 28 executes the above-described ES and the charging based on the remaining power of the power battery 40 as the power battery use ES.

[0127] Specifically, similar to the above-described embodiments, the ET control unit 28 performs ES by controlling the two non-insulated bidirectional DC / DC converters 26 for the power in the discharge power that corresponds to the power required for charging, and thus uses it for charging the battery 6-1.

[0128] On the other hand, the ET control unit 28 controls the non-insulated bidirectional DC / DC converter 26-2 and the power battery 40 for the remaining power, and performs output to and charging of the power battery 40. As a result, the remaining power is input from the battery 6-2 to the power battery 40 via the non-insulated bidirectional DC / DC converter 26-2 and the second DC bus 24, and this remaining power is charged into the power battery 40 (reference sign ES-1).

[0129] Here, if the remaining power is equal to or less than the rechargeable capacity of the power battery 40, all the remaining power is charged into the power battery 40. On the other hand, when the remaining power exceeds the rechargeable capacity of the power battery 40, the ET control unit 28 controls the non-insulated bidirectional DC / DC converter 26-2 and the insulated bidirectional DC / DC converter 22 to output the power corresponding to the excess amount of the remaining power (hereinafter referred to as excess power) to the bidirectional AC / DC converter 12. As a result, the excess power is input from the battery 6-2 to the bidirectional AC / DC converter 12 via the non-insulated bidirectional DC / DC converter 26-2, the second DC bus 24, the insulated bidirectional DC / DC converter 22, and the first DC bus 14.

[0130] When the main control device 18 of the third embodiment generates excess power, it operates the bidirectional AC / DC converter 12. The bidirectional AC / DC converter 12 converts the excess power (DC power) input from the power supply device 16 via the first DC bus 14 into AC power and then regenerates it to the AC power supply 9 via the AC bus 8 (reference sign RE).

[0131] Figure 14 It is an explanatory diagram for explaining the use of the power battery ES and the supplementary power supply from the AC power supply 9 when there is a shortage of discharge power relative to the power required for charging. As Figure 14 shown, when the ET control unit 28 generates a shortage of discharge power relative to the power required for charging based on the result of the determination process, it uses the power battery ES and performs the above-described ES and the discharge of supplementary power based on the power battery 40.

[0132] Specifically, the ET control unit 28 controls the two non-isolated bidirectional DC / DC converters 26 to perform ES. Thus, all of the power discharged from the battery 6-2 (except for the portion consumed by the non-isolated bidirectional DC / DC converter 26) is charged to the battery 6-1 via the non-isolated bidirectional DC / DC converter 26-2, the second DC bus 24, and the non-isolated bidirectional DC / DC converter 26-1.

[0133] In addition, the ET control unit 28 controls the non-isolated bidirectional DC / DC converter 26-1 and the power cell 40 to discharge supplementary power from the power cell 40. Thus, supplementary power is input from the power cell 40 to the battery 6-1 via the second DC bus 24 and the non-isolated bidirectional DC / DC converter 26-1, and this supplementary power is charged to the battery 6-1 (reference symbol ES-2).

[0134] Here, when the shortage of the discharge power relative to the power required for charging is less than the dischargeable capacity of the power cell 40, the shortage of the discharge power relative to the power required for charging can be supplemented only by the supplementary power discharged from the power cell 40. On the other hand, when this shortage exceeds the dischargeable capacity of the power cell 40, the main control device 18 and the ET control unit 28 perform additional supplementary power supply to supplement the shortage of the dischargeable capacity of the power cell 40 using additional supplementary power from the AC power supply 9.

[0135] Specifically, the main control device 18 operates the bidirectional AC / DC converter 12. The bidirectional AC / DC converter 12 receives the supply of additional supplementary power (AC power) for supplementing the shortage of the dischargeable capacity of the power cell 40 from the AC power supply 9 via the AC bus 8, converts this additional supplementary power into DC power, and then outputs it to the isolated bidirectional DC / DC converter 22 via the first DC bus 14 (reference symbol SU).

[0136] And, the ET control unit 28 controls the isolated bidirectional DC / DC converter 22 and the non-isolated bidirectional DC / DC converter 26-1 to input the additional supplementary power from the isolated bidirectional DC / DC converter 22 to the battery 6-1 via the second DC bus 24 and the non-isolated bidirectional DC / DC converter 26-1, and charge this additional supplementary power to the battery 6-1.

[0137] Figure 15 is a flowchart showing the process of the charge and discharge test of the two batteries 6 of the charge and discharge test system 10 based on the third embodiment. In addition, the process flow of the processing up to step S3 is the same as that of the first embodiment described in Figure 8 and is thus omitted here.

[0138] When there is no shortage or surplus of discharge power relative to the power required for charging, the ET control unit 28 controls each non-insulated bidirectional DC / DC converter 26 in the same manner as in the first embodiment and only executes ES (No in step S10, step S11).

[0139] When there is a surplus of discharge power relative to the power required for charging, the ET control unit 28 determines whether the surplus power is equal to or less than the rechargeable capacity of the power battery 40 (Yes in step S10, step S12, step S13).

[0140] Then, when the ET control unit 28 determines that the surplus power is equal to or less than the rechargeable capacity of the power battery 40, it controls each non-insulated bidirectional DC / DC converter 26 and the power battery 40 to execute the power battery usage ES as described above. Figure 13 As shown, the power battery usage ES is executed. Thus, ES is preferentially executed, and only the surplus power remaining after this ES is charged from the battery 6-2 to the power battery 40 via the non-insulated bidirectional DC / DC converter 26-2 and the second DC bus 24. In this case, different from the above-described embodiments, it is not necessary to regenerate the surplus power to the AC power supply 9, and further, this surplus power is temporarily charged to the power battery 40 connected to the second DC bus 24. Therefore, the power usage efficiency of the charge and discharge test system 10 can be further improved.

[0141] On the other hand, when the ET control unit 28 determines that the surplus power exceeds the rechargeable capacity of the power battery 40, as described above. Figure 13 As shown, it controls each non-insulated bidirectional DC / DC converter 26 and the power battery 40 to execute the power battery usage ES, and further executes the regeneration of the excess power together with the main control device 18 (No in step S13, step S15). Thus, the power battery usage ES similar to step S14 is executed, and only the excess power that cannot be charged in the power battery 40 is input to the bidirectional AC / DC converter 12 via the second DC bus 24, the insulated bidirectional DC / DC converter 22, and the first DC bus 14. Then, this excess power (DC power) is converted into AC power by the bidirectional AC / DC converter 12 and regenerated to the AC power supply 9 via the AC bus 8. By suppressing the surplus power regenerated in the AC power supply 9 to the minimum through the power battery usage ES, the power usage efficiency of the charge and discharge test system 10 can be improved.

[0142] In addition, when there is a shortage of discharge power relative to the power required for charging, the ET control unit 28 determines whether the shortage amount of discharge power relative to the power required for charging is equal to or less than the dischargeable capacity of the power battery 40 (Yes in step S10, step S12, step S16).

[0143] Then, when the ET control unit 28 determines that the shortage amount of the discharge power is equal to or less than the dischargeable capacity of the power battery 40, it controls each non-insulated bidirectional DC / DC converter 26 and the power battery 40 to perform the power battery use ES as described above Figure 13 as shown. Thus, the ES is preferentially executed, and supplementary power for supplementing the shortage amount in the ES is discharged from the power battery 40. This supplementary power charges the battery 6-1 via the second DC bus 24 and the non-insulated bidirectional DC / DC converter 26-1. In this case, since all the supplementary power can be supplemented from the power battery 40, different from the above-described embodiments, it is not necessary to supply supplementary power from the AC power supply 9, and the power use efficiency of the charge-discharge test system 10 can be further improved.

[0144] On the other hand, when the ET control unit 28 determines that the shortage amount of the discharge power exceeds the dischargeable capacity of the power battery 40, it controls each non-insulated bidirectional DC / DC converter 26 and the power battery 40 to perform the power battery use ES as described above Figure 14 as shown, and further performs additional supplementary power supply together with the main control device 18 (No in step S16, step S18). Thus, the power battery use ES similar to step S17 is executed, and the additional supplementary power is charged from the AC power supply 9 to the battery 6-1 via the AC bus 8, the bidirectional AC / DC converter 12, the first DC bus 14, the insulated bidirectional DC / DC converter 22, the second DC bus 24, and the non-insulated bidirectional DC / DC converter 26-1. By suppressing the additional supplementary power supplemented from the AC power supply 9 to the minimum through the power battery use ES, the power use efficiency of the charge-discharge test system 10 can be improved.

[0145] Hereinafter, until the charge-discharge tests of the two batteries 6 are completed, the processes after step S3 described above are repeatedly executed (No in step S19). Then, when the charge-discharge tests of the two batteries 6 are completed (step S19: Yes), two new batteries 6 on the production line 7 are transported to the test position, and thus the above-described processes are repeatedly executed.

[0146] As described above, in the charge-discharge test system 10 of the third embodiment, by connecting the power battery 40 to the second DC bus 24 and performing the power battery use ES using the power battery 40, the power use efficiency of the charge-discharge test system 10 can be further improved.

[0147] [Fourth Embodiment]

[0148] Figure 16It is a block diagram of the charge-discharge test system 10 of the fourth embodiment. In the charge-discharge test systems 10 of the above-described embodiments, two batteries 6 are electrically connected to the power supply device 16. However, as Figure 16 shown, in the charge-discharge test system 10 of the fourth embodiment, three or more batteries 6 are electrically connected to the power supply device 16. In addition, the charge-discharge test system 10 of the fourth embodiment has substantially the same structure as the charge-discharge test systems 10 of the above-described embodiments, except for the difference in the structure of the power supply device 16. Therefore, parts that are the same in function or structure as those of the above-described embodiments are denoted by the same reference numerals and their description is omitted.

[0149] The power supply device 16 of the fourth embodiment includes three or more non-insulated bidirectional DC / DC converters 26. Furthermore, the second DC bus 24 includes a second DC bus 24b that electrically connects three or more non-insulated bidirectional DC / DC converters 26 in parallel with respect to the insulated bidirectional DC / DC converter 22. Other than this, it has the same structure as the power supply device 16 of the above-described embodiments. In the following description, in order to prevent complication of the description, the second DC bus 24 and the second DC bus 24b are collectively referred to as the "second DC bus 24".

[0150] Each non-insulated bidirectional DC / DC converter 26 is connected to a battery 6 via a connector 19 (see Figure 1 ) and the like, respectively, in the same manner as in the above-described embodiments. Thus, the power supply device 16 of the fourth embodiment can perform a charge-discharge test on three or more batteries 6.

[0151] When three or more batteries 6 are electrically connected to the power supply device 16, the ET control unit 28 of the fourth embodiment synchronizes the charging timing for charging at least one battery 6 in accordance with the charging mode P1 with the discharging timing for discharging at least one battery 6 in accordance with the discharging mode P2 in order to execute ES.

[0152] Moreover, the ET control unit 28 of the fourth embodiment calculates, although not shown, a combined charging mode obtained by combining the charging modes P1 of all the batteries 6-1 to be charged and a combined discharging mode obtained by combining the discharging modes P2 of all the batteries 6-2 to be discharged, based on the charge-discharge modes (charging mode P1, discharging mode P2) respectively set for each battery 6. In this case, the combined charging mode represents the time change of the charging required power for charging all the batteries 6 to be charged, and the combined discharging mode represents the time change of the discharging power discharged from all the batteries 6 to be discharged.

[0153] In addition, as described in the second embodiment above, when performing correction corresponding to the amount of power consumed by each non-insulated bidirectional DC / DC converter 26, correction is performed on the combined charging mode to increase the amount of power consumed by each non-insulated bidirectional DC / DC converter 26-1. Further, correction is performed on the combined discharging mode to decrease the amount of power consumed by each non-insulated bidirectional DC / DC converter 26.

[0154] Next, the ET control unit 28 of the fourth embodiment performs the above-described determination process based on the differential mode (not shown) between the combined charging mode and the combined discharging mode, and controls the charging and discharging of each battery 6 based on the result of the determination process to preferentially execute ES. Thus, the power output from at least one battery 6-2 via the non-insulated bidirectional DC / DC converter 26-2 is charged to at least one battery 6-1 via the second DC bus 24 and at least one non-insulated bidirectional DC / DC converter 26-1.

[0155] In addition, when there is a surplus or shortage of discharge power relative to the power required for charging in the fourth embodiment, regeneration or supplementary power supply to the AC power supply 9 described in the above embodiments is performed. Further, in the fourth embodiment, the power cell use ES described in the third embodiment above can also be performed.

[0156] As described above, the charge / discharge test system 10 of the fourth embodiment can improve the efficiency of the charge / discharge test compared to the above embodiments by increasing the number of batteries 6 for which the charge / discharge test is performed compared to the above embodiments.

[0157] [Fifth Embodiment]

[0158] Figure 17 is a block diagram of the charge / discharge test system 10 of the fifth embodiment. In the charge / discharge test systems 10 of the above embodiments, all the batteries 6 electrically connected to the power supply device 16 are subject to the charge / discharge test. In contrast, in the charge / discharge test system 10 of the fifth embodiment, one or more of the batteries 6 that are subject to the charge / discharge test and one or more of the batteries 6 that are not subject to the charge / discharge test are electrically connected to the power supply device 16.

[0159] As Figure 17 shown, the charge / discharge test system 10 of the fifth embodiment has a structure that is basically the same as that of the charge / discharge test systems 10 of the above embodiments, except that the batteries 6 other than those subject to the charge / discharge test are electrically connected to the power supply device 16. Therefore, parts that are the same as those in the above embodiments in terms of function or structure are denoted by the same reference numerals and their description is omitted.

[0160] The plurality of batteries 6 electrically connected to each non-insulated bidirectional DC / DC converter 26 of the fifth embodiment each include one or more batteries 6 that are the objects of charge and discharge tests, i.e., test batteries 6A (equivalent to the test charge and discharge bodies of the present invention), and batteries 6 that are not the objects of charge and discharge tests, i.e., reserve batteries 6B (equivalent to the reserve charge and discharge bodies of the present invention). In addition, the reserve batteries 6B are arranged in a place outside the production line 7, such as inside a thermostatic chamber (also called a rack).

[0161] The test battery 6A and the reserve battery 6B are different from each other, for example, in whether they are batteries 6 that are the objects of charge and discharge tests or not, but the types of the two can be the same or different. Hereinafter, the non-insulated bidirectional DC / DC converter 26 electrically connected to the reserve battery 6B is appropriately referred to as the "remaining converter 26-3". In addition, the non-insulated bidirectional DC / DC converter 26 electrically connected to the test battery 6A is equivalent to the test converter in the present invention.

[0162] The reserve battery 6B and the remaining converter 26-3 play the same role as the power battery 40 described in the above third embodiment. The ET control unit 28 of the fifth embodiment calculates and synthesizes the combined charging mode of the charging mode P1 of all the test batteries 6A that are being charged and the combined discharging mode of the discharging mode P2 of all the test batteries 6A that are being discharged. Next, the ET control unit 28 performs the above-described determination process based on the differential mode (not shown) between the combined charging mode and the combined discharging mode. When there is a surplus of discharging power relative to the power required for charging based on the result of this determination process, in addition to executing the above-described ES, charging based on the surplus power of the reserve battery 6B is also performed.

[0163] Specifically, the ET control unit 28 controls at least one non-insulated bidirectional DC / DC converter 26-2 and at least one remaining converter 26-3 to perform charging of the surplus power to at least one reserve battery 6B. Thus, the surplus power output from at least one test battery 6A (battery 6-2) via the non-insulated bidirectional DC / DC converter 26-2 is charged to at least one reserve battery 6B via the second DC bus 24 and at least one remaining converter 26-3.

[0164] In addition, when the surplus power exceeds the rechargeable capacity of all the reserve batteries 6B, the excess power equivalent to this excess is regenerated in the AC power supply 9 in the same manner as in the above third embodiment.

[0165] On the other hand, when there is a shortage of discharge power relative to the power required for charging based on the result of the above-described determination process, the ET control unit 28, in addition to executing the aforementioned ES, also executes discharge of supplementary power based on the reserve battery 6B. Specifically, the ET control unit 28 controls at least one remaining converter 26-3 and at least one non-insulated bidirectional DC / DC converter 26-1 to execute discharge of supplementary power from at least one reserve battery 6B. Thereby, the supplementary power output from at least one reserve battery 6B via the remaining converter 26-3 charges at least one test battery 6A (battery 6-1) via the second DC bus 24 and at least one non-insulated bidirectional DC / DC converter 26-1.

[0166] In addition, when the shortage of discharge power relative to the power required for charging cannot be supplemented only by the supplementary power discharged from all the reserve batteries 6B, in the same manner as in the above-described third embodiment, an additional supplementary power supply for supplementing the shortage of the supplementary power by the additional supplementary power from the AC power supply 9 is executed.

[0167] As described above, in the charge-discharge test system 10 of the fifth embodiment, by charging the reserve battery 6B with the surplus power or supplying the supplementary power from the reserve battery 6B, the surplus power regenerated in the AC power supply 9 and the supplementary power supplied from the AC power supply 9 can be suppressed to the minimum. As a result, the power usage efficiency of the charge-discharge test system 10 can be improved in the same manner as in the above-described third embodiment. In addition, by using the reserve battery 6B, it is not necessary to provide the power storage battery 40 as in the above-described third embodiment, and thus cost reduction of the charge-discharge test system 10 can be achieved.

[0168] [Sixth Embodiment]

[0169] Figure 18 is a block diagram of the charge-discharge test system 10 of the sixth embodiment. The charge-discharge test system 10 of the above-described embodiments includes one power supply device 16, but the charge-discharge test system 10 of the sixth embodiment includes a plurality of power supply devices 16, and can execute the inter-power-supply-device ES described later between the power supply devices 16 that are different from each other (one or more batteries 6 connected to the power supply device 16). In addition, the charge-discharge test system 10 of the sixth embodiment has substantially the same structure as the charge-discharge test system 10 of the above-described embodiments except for including a plurality of power supply devices 16. Therefore, parts that are the same in function or structure as those of the above-described embodiments are denoted by the same reference numerals and their description is omitted.

[0170] The first DC bus 14 of the sixth embodiment includes a first DC bus 14a that connects the bidirectional AC / DC converter 12 and at least one power supply device 16. Thus, a plurality of power supply devices 16 are electrically connected to the other end of the bidirectional AC / DC converter 12 via the first DC buses 14 and 14a. In addition, in the following description, to prevent complication of the description, the first DC bus 14 and the first DC bus 14a are collectively referred to as the "first DC bus 14".

[0171] The plurality of power supply devices 16 of the sixth embodiment can be any one of the power supply devices 16 of the above-described embodiments, or the power supply devices 16 of the above-described embodiments can be mixed. Hereinafter, it is assumed that the plurality of power supply devices 16 are the power supply devices 16 of the first embodiment or the second embodiment described above for explanation.

[0172] The main control device 18 of the sixth embodiment sequentially obtains the results of the above-described determination process performed by the ET control unit 28 for each power supply device 16, and thereby sequentially determines whether there is a surplus and a surplus of the discharge power with respect to the power required for charging for each power supply device 16. And, in the plurality of power supply devices 16, when a shortage of discharge power occurs in at least one power supply device 16 and a surplus of discharge power occurs in at least one power supply device 16, the main control device 18 preferentially executes power supply between power supply devices ES from the latter to the former. That is, in the plurality of power supply devices 16, when the power required for charging the battery 6 is insufficient in at least one power supply device 16 and at least one power supply device 16 can output power (can supply power) to other power supply devices 16, power supply between power supply devices ES is preferentially executed.

[0173] To execute such power supply between power supply devices ES, the main control device 18 synchronizes the timings of charge and discharge tests between different power supply devices 16. In addition, in each power supply device 16, as described above, the charging timing for charging one of the two batteries 6 is synchronized with the discharging timing for discharging the other of the two batteries 6.

[0174] In addition, when there is still surplus power or insufficient power even if power supply between power supply devices ES is executed, the main control device 18 executes regeneration to the AC power supply 9 or supplies supplementary power from the AC power supply 9.

[0175] Figure 19 It is an explanatory diagram for explaining power supply between power supply devices ES and regeneration of surplus power to the AC power supply 9. In addition, Figure 20This is an explanatory diagram for the ES between power supply devices and the supplementary power supply from the AC power supply 9. Hereinafter, the power supply device 16 that generates a shortage of discharge power relative to the power required for charging is appropriately referred to as "power supply device 16-1", and the power supply device 16 that generates a surplus of discharge power relative to the power required for charging is appropriately referred to as "power supply device 16-2".

[0176] As Figure 19 and Figure 20 shown, based on the result of the determination process of the ET control unit 28 of each power supply device 16, the main control device 18 controls both to perform ES between the power supply devices when there are a power supply device 16-1 and a power supply device 16-2 respectively. Thus, surplus power (reference symbol PS) is supplied from at least one power supply device 16-2 to at least one power supply device 16-1 via the first DC bus 14. As a result, the surplus power is used for charging the battery 6 in at least one power supply device 16-1.

[0177] In addition, as Figure 19 shown, when the total value of the surplus amounts of the discharge power in all the power supply devices 16-2 is larger than the total value of the shortage amounts of the discharge power in all the power supply devices 16-1, the main control device 18 controls the bidirectional AC / DC converter 12 and at least one power supply device 16-2 to regenerate the surplus power remaining in the ES between the power supply devices. Thus, the surplus power is regenerated to the AC power supply 9 via the first DC bus 14, the bidirectional AC / DC converter 12, and the AC bus 8 (reference symbol RE).

[0178] On the contrary, as Figure 20 shown, when the total value of the shortage amounts of the discharge power in all the power supply devices 16-1 is larger than the total value of the surplus amounts of the discharge power in all the power supply devices 16-2, the main control device 18 controls the bidirectional AC / DC converter 12 and at least one power supply device 16-1 to supplement the supplementary power that cannot be supplemented in the ES between the power supply devices from the AC power supply 9. Thus, the supplementary power is supplied to at least one power supply device 16-1 via the AC bus 8, the bidirectional AC / DC converter 12, and the first DC bus 14, and is used for charging the battery 6 here (reference symbol SU).

[0179] As described above, in the sixth embodiment, when a plurality of power supply devices 16 are provided, by performing ES between the power supply devices, the surplus power regenerated to the AC power supply 9 and the supplementary power supplied from the AC power supply 9 can be reduced, so that the power usage efficiency of the charge and discharge test system 10 can be further improved.

[0180] In addition, in the above-described sixth embodiment, the case where the plurality of power supply devices 16 are the power supply devices 16 of the above-described first embodiment or the above-described second embodiment has been described as an example. However, in the case where the plurality of power supply devices 16 are the power supply devices 16 of the above-described fourth embodiment that control charging and discharging of three or more batteries 6, inter-power-supply-device ES can also be performed in the same manner as in the above-described sixth embodiment.

[0181] Furthermore, in the case where the plurality of power supply devices 16 are the power supply devices 16 of the above-described fifth embodiment that are electrically connected to the power supply device 16 of the above-described third embodiment including the power cell 40 or the reserve battery 6B, inter-power-supply-device ES can also be performed in the same manner as in the above-described sixth embodiment. In this case, the main control device 18 performs inter-power-supply-device ES when, among the plurality of power supply devices 16, the shortage amount of the discharge power relative to the power required for charging exceeds the dischargeable capacity of the power cell 40 or the reserve battery 6B in at least one power supply device 16, and the surplus amount of the discharge power relative to the power required for charging exceeds the chargeable capacity of the power cell 40 or the reserve battery 6B in at least one power supply device 16.

[0182] [Other]

[0183] In the above-described embodiments, the case where charging and discharging tests are performed on the plurality of batteries 6 on the production line 7 has been described as an example. However, the present invention can be applied to charging and discharging tests of the plurality of batteries 6 arranged in any place such as in a thermostat.

[0184] In the above-described embodiments, the battery 6 has been described as an example of the charge and discharge body of the present invention. However, there is no particular limitation as long as it is an object of a charging and discharging test of a capacitor, a motor with a power converter, or the like.

[0185] -Symbol Explanation-

[0186] 6… Battery, 6-1… Battery, 6-2… Battery, 6A… Test battery, 6B… Reserve battery, 7… Production line, 8… AC bus, 8a… AC bus, 8b… AC bus, 9… AC power supply, 10… Charge and discharge test system, 12… Bidirectional AC / DC converter, 12-1… Bidirectional AC / DC converter, 12-2… Bidirectional AC / DC converter, 14… First DC bus, 14a… First DC bus, 16… Power supply device, 16-1… Power supply device, 16-2… Power supply device, 18… Main control device, 19… Connector part, 22… Insulated bidirectional DC / DC converter, 24… Second DC bus, 24a… Second DC bus, 24b… Second DC bus, 26… Non-insulated bidirectional DC / DC converter, 26-1… Non-insulated bidirectional DC / DC converter, 26-2… Non-insulated bidirectional DC / DC converter, 26-3… Remaining converter, 28… ET control unit, 40… Power battery, 100… Charge and discharge test system, 102… Power supply device, 104… Insulated bidirectional DC / DC converter, 104-1… Insulated bidirectional DC / DC converter, 104-2… Insulated bidirectional DC / DC converter, No1… Battery, No2… Battery, P1… Charge mode, P1A… Charge mode, P2… Discharge mode, P2A… Discharge mode, P3… Differential mode, P3A… Differential mode.

Claims

1. A charge-discharge test system for performing charge-discharge tests on a plurality of charge-discharge bodies, the charge-discharge test system comprising: A bidirectional AC / DC converter, one end of which is connected to an AC power supply via an AC bus, and the other end of which is connected to a first DC bus; An isolated bidirectional DC / DC converter, one end of which is connected to the bidirectional AC / DC converter via the first DC bus, and the other end of which is connected to a second DC bus; A plurality of non-isolated bidirectional DC / DC converters, one end of each of which is connected to the isolated bidirectional DC / DC converter via the second DC bus, and the other end of each of which is connected to a different one of the charge-discharge bodies; and A charge-discharge control unit that controls the bidirectional AC / DC converter, the isolated bidirectional DC / DC converter, and the plurality of non-isolated bidirectional DC / DC converters, and controls the charge and discharge of the plurality of charge-discharge bodies respectively connected to the plurality of non-isolated bidirectional DC / DC converters, The charge-discharge control unit causes the power output from at least one of the charge-discharge bodies that is discharging to be charged to at least one of the charge-discharge bodies that can be charged via the second DC bus and at least one of the non-isolated bidirectional DC / DC converters through the non-isolated bidirectional DC / DC converter.

2. The charge-discharge test system according to claim 1, wherein, When the discharge power, which is the power discharged from all of the charge-discharge bodies that are discharging, is surplus with respect to the power required for charging, which is the power required for charging all of the charge-discharge bodies that can be charged, the charge-discharge control unit regenerates the surplus power equivalent to the surplus amount of the discharge power from at least one of the non-isolated bidirectional DC / DC converters to the AC power supply via the second DC bus, the isolated bidirectional DC / DC converter, the first DC bus, the bidirectional AC / DC converter, and the AC bus.

3. The charge-discharge test system according to claim 1, wherein, When the discharge power, which is the power discharged from all of the charge-discharge bodies that are discharging, is insufficient with respect to the power required for charging, which is the power required for charging all of the charge-discharge bodies that can be charged, the charge-discharge control unit causes the supplementary power that supplements the shortage amount of the discharge power to be charged to at least one of the charge-discharge bodies from the AC power supply via the AC bus, the bidirectional AC / DC converter, the first DC bus, the isolated bidirectional DC / DC converter, the second DC bus, and at least one of the non-isolated bidirectional DC / DC converters.

4. The charge-discharge test system according to claim 1, wherein, The charge-discharge test system comprises: a power battery, connected to the second DC bus, capable of controlling charge and discharge based on the charge-discharge control unit. When the power discharged from all the charge-discharge bodies performing discharging, i.e., the discharge power, is surplus with respect to the power required for charging all the charge-discharge bodies performing charging, i.e., the power required for charging, the charge-discharge control unit charges the power storage battery with surplus power equivalent to the surplus amount of the discharge power from at least one of the non-insulated bidirectional DC / DC converters via the second DC bus.

5. The charge-discharge test system according to claim 4, wherein, when the generated surplus power exceeds the rechargeable capacity of the power storage battery, the charge-discharge control unit regenerates power equivalent to the excess amount of the surplus power from the second DC bus via the insulated bidirectional DC / DC converter, the first DC bus, the bidirectional AC / DC converter, and the AC bus to the AC power supply.

6. The charge-discharge test system according to claim 4, wherein, a plurality of power supply devices including the insulated bidirectional DC / DC converter, the second DC bus, the power storage battery, and the plurality of non-insulated bidirectional DC / DC converters are connected to the bidirectional AC / DC converter via the first DC bus, when the generated surplus power in at least one of the power supply devices exceeds the rechargeable capacity of the power storage battery, the charge-discharge control unit outputs power equivalent to the excess amount of the surplus power generated in at least one of the power supply devices to at least one other power supply device capable of inputting power via the first DC bus.

7. The charge-discharge test system according to claim 1, wherein, the charge-discharge test system includes: a power storage battery connected to the second DC bus and capable of controlling charge and discharge based on the charge-discharge control unit, when the power discharged from all the charge-discharge bodies performing discharging, i.e., the discharge power, is insufficient with respect to the power required for charging all the charge-discharge bodies performing charging, i.e., the power required for charging, the charge-discharge control unit charges at least one of the charge-discharge bodies with supplementary power for supplementing the insufficient amount of the discharge power from the power storage battery via the second DC bus and at least one of the non-insulated bidirectional DC / DC converters.

8. The charge-discharge test system according to claim 7, wherein, when the dischargeable capacity of the power storage battery is insufficient with respect to the insufficient amount of the discharge power, the charge-discharge control unit charges at least one of the charge-discharge bodies with power for supplementing the insufficient amount of the dischargeable capacity from the AC power supply via the AC bus, the bidirectional AC / DC converter, the first DC bus, the insulated bidirectional DC / DC converter, the second DC bus, and at least one of the non-insulated bidirectional DC / DC converters.

9. The charge-discharge test system according to claim 7, wherein, A plurality of power supply devices including the insulated bidirectional DC / DC converter, the second DC bus, the power battery, and a plurality of the non-insulated bidirectional DC / DC converters are connected to the bidirectional AC / DC converter via the first DC bus. When the shortage amount of the dischargeable capacity of the power battery in at least one of the power supply devices is insufficient with respect to the discharge power, the charge / discharge control unit outputs power from at least one of the power supply devices capable of outputting power to at least one of the power supply devices that generates the shortage of the dischargeable capacity via the first DC bus.

10. The charge / discharge test system according to claim 1, wherein, A plurality of power supply devices including the insulated bidirectional DC / DC converter, the second DC bus, and a plurality of the non-insulated bidirectional DC / DC converters are connected to the bidirectional AC / DC converter via the first DC bus. When the power required for charging the charge / discharge body is insufficient in at least one of the power supply devices and at least one of the power supply devices is capable of supplying power to other power supply devices, the charge / discharge control unit performs power supply from at least one of the power supply devices capable of supplying power to at least one of the power supply devices in which the power required for charging the charge / discharge body is insufficient via the first DC bus.

11. The charge / discharge test system according to any one of claims 6, 9, and 10, wherein, The charge / discharge control unit synchronizes the timing of the charge / discharge test between the different power supply devices.

12. The charge / discharge test system according to any one of claims 2 to 9, wherein, The charge / discharge control unit calculates the power required for charging based on the result of correcting the power required for charging all the charge / discharge bodies to be charged to increase the power consumption of all the non-insulated bidirectional DC / DC converters corresponding to all the charge / discharge bodies to be charged. The charge / discharge control unit calculates the discharge power based on the result of correcting the power discharged from all the charge / discharge bodies to be discharged to reduce the power consumption of all the non-insulated bidirectional DC / DC converters corresponding to all the charge / discharge bodies to be discharged.

13. The charge / discharge test system according to any one of claims 1 to 10, wherein, Each of the plurality of non-insulated bidirectional DC / DC converters includes at least one in-test converter and a remaining converter. The in-test converter is connected to the charge / discharge body that is the object of the charge / discharge test, i.e., the test charge / discharge body, and the remaining converter is connected to the charge / discharge body different from the test charge / discharge body, i.e., the standby charge / discharge body.

14. The charge / discharge test system according to any one of claims 1 to 10, wherein, The charge / discharge control unit synchronizes the timing of discharging power from at least one of the charge / discharge bodies with the timing of charging power to at least one of the charge / discharge bodies.

15. A control method for a charge / discharge test system, the charge / discharge test system comprising: A bidirectional AC / DC converter, one end of which is connected to an AC power supply via an AC bus, and the other end is connected to a first DC bus; An isolated bidirectional DC / DC converter, one end of which is connected to the bidirectional AC / DC converter via the first DC bus, and the other end is connected to a second DC bus; and A plurality of non-isolated bidirectional DC / DC converters, one end of which is connected to the isolated bidirectional DC / DC converter via the second DC bus, and the other end is connected to the different charge and discharge bodies, Controlling the bidirectional AC / DC converter, the isolated bidirectional DC / DC converter, and the plurality of non-isolated bidirectional DC / DC converters, and controlling the charging and discharging of the plurality of charge and discharge bodies respectively connected to the plurality of non-isolated bidirectional DC / DC converters. In the control method of the charge and discharge test system, Causing the power output from at least one of the charge and discharge bodies performing discharge via the non-isolated bidirectional DC / DC converter to be charged to at least one of the charge and discharge bodies capable of being charged via the second DC bus and at least one of the non-isolated bidirectional DC / DC converters.

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