V2G bidirectional aging test device, system and method

Abstract

The invention relates to a V2G bidirectional aging test device, system and method. The device comprises a mains supply input end, a first V2G alternating current input end, a second V2G alternating current input end, a first V2G direct current input end, a second V2G direct current input end and a control module, the control module communicates with the first V2G charging pile and the second V2G charging pile so as to control the first V2G charging pile and the second V2G charging pile to carry out bidirectional aging. According to the V2G bidirectional aging test device, system and method, the characteristic of bidirectional energy flow of the V2G charging piles is utilized, external loads are not needed, back-to-back simultaneous aging of the two V2G charging piles can be achieved, and the V2G aging efficiency is improved; and the AC power distribution capacity demand and the energy loss are greatly reduced through energy circulation, and the aging test cost is reduced.

Description

Technical Field

[0001] The present invention relates to the field of electric vehicle to grid (V2G) charging piles, and more specifically, to a V2G bidirectional aging test device, system and method. Background Art

[0002] With the global promotion of two-way interaction between vehicles and the Internet, V2G charging piles with bidirectional charging and discharging capabilities have received widespread attention and accelerated application. Compared with ordinary DC charging piles with unidirectional energy flow, V2G DC charging piles can achieve bidirectional energy flow, and the internal design and circuits are more complex. Therefore, more stringent tests are required both in the R&D stage and the factory stage, among which long-term or short-term aging is an essential test item.

[0003] The usual V2G DC charging pile aging test requires the following conditions: sufficient capacity of AC power supply (when charging) and DC power supply (when discharging); vehicle battery management system (BMS) simulator for communication with the charging pile; sufficient capacity of AC load and DC load. Therefore, the cost is high, and only one device can be aged at a time. Summary of the invention

[0004] The technical problem to be solved by the present invention is that, in view of the above-mentioned defects of the prior art, a V2G bidirectional aging test device, system and method are provided, which utilize the characteristics of bidirectional energy flow of V2G charging piles without relying on external loads, and can realize back-to-back simultaneous aging of two V2G charging piles, thereby improving aging efficiency, reducing losses and reducing aging test costs.

[0005] The technical solution adopted by the present invention to solve the technical problem is: construct a V2G bidirectional aging test device, including a mains input terminal, a first V2G AC input terminal, a second V2G AC input terminal, a first V2G DC input terminal, a second V2G DC input terminal and a control module;

[0006] The mains input terminal is connected to the mains power grid, the first V2G AC input terminal is connected to the AC terminal of the first V2G charging pile, the first V2G DC input terminal is connected to the first DC charging gun of the first V2G charging pile, the second V2G AC input terminal is connected to the AC terminal of the second V2G charging pile, and the second V2G DC input terminal is connected to the second DC charging gun of the second V2G charging pile;

[0007] The control module communicates with the first V2G charging pile and the second V2G charging pile respectively to control the first V2G charging pile and the second V2G charging pile to achieve bidirectional aging.

[0008] In the V2G bidirectional aging test device of the present invention, the control module communicates with the first V2G charging pile and the second V2G charging pile respectively to control the first V2G charging pile and the second V2G charging pile to achieve bidirectional aging, including:

[0009] The control module communicates with the first V2G charging pile and the second V2G charging pile respectively to control the first V2G charging pile and the second V2G charging pile to age in a first aging mode and a second aging mode respectively.

[0010] In the V2G bidirectional aging test device of the present invention, the control module communicates with the first V2G charging pile and the second V2G charging pile respectively to control the first V2G charging pile and the second V2G charging pile to perform aging in the first aging mode and the second aging mode respectively, including:

[0011] In the first aging mode, the first V2G charging pile is first set to enter a charging no-output state, and then the second V2G charging pile is set to enter a discharging state to perform DC-AC energy conversion, and then the first V2G charging pile outputs current and performs AC-DC energy conversion;

[0012] In the second aging mode, the second V2G charging pile is first set to enter a charging no-output state, and then the first V2G charging pile is set to enter a discharging state to perform DC-AC energy conversion, and then the second V2G charging pile outputs current and performs AC-DC energy conversion.

[0013] In the V2G bidirectional aging test device of the present invention, the control module includes a main controller, an input unit and a switch unit;

[0014] The input unit is used to receive battery management system parameters and mode instructions input by a user;

[0015] The switch unit is connected between the first V2G charging pile and the second V2G charging pile, and is connected or disconnected under the control of the main controller;

[0016] The main controller is used to send the battery management system parameters to the first V2G charging pile and the second V2G charging pile, and the first V2G charging pile and the second V2G charging pile perform energy conversion based on the battery management system parameters;

[0017] The main controller is further configured to control the first V2G charging pile and the second V2G charging pile to operate in the first aging mode and the second aging mode respectively based on the mode instruction.

[0018] In the V2G bidirectional aging test device of the present invention, the mode instruction includes a first charging instruction and a first discharging instruction; the battery management system parameter includes a first voltage parameter and a first current parameter;

[0019] After receiving the first charging instruction, the main controller controls the first V2G charging pile to select a charging mode and start charging, and sends the first voltage parameter to the first V2G charging pile. The first V2G charging pile starts based on the first voltage parameter. At this time, the switch unit is disconnected, and the first V2G charging pile has voltage output but no current output;

[0020] The main controller receives a first output voltage from the first V2G charging pile, and after determining that the first output voltage is normal and receiving the first discharge instruction, controls the second V2G charging pile to select a discharge mode and start discharging. At this time, the switch unit is closed, the second V2G charging pile performs DC-AC energy conversion according to the first current parameter, the first V2G charging pile outputs current and performs AC-DC energy conversion, and the first V2G charging pile and the second V2G charging pile perform energy circulation.

[0021] In the V2G bidirectional aging test device of the present invention, the mode instruction includes a second charging instruction and a second discharging instruction; the battery management system parameter includes a second voltage parameter and a second current parameter;

[0022] After receiving the second charging instruction, the main controller controls the second V2G charging pile to select a charging mode and start charging, and sends the second voltage parameter to the second V2G charging pile. The second V2G charging pile starts based on the second voltage parameter. At this time, the switch unit is disconnected, and the second V2G charging pile has voltage output but no current output;

[0023] The main controller receives a second output voltage from the second V2G charging pile, and after determining that the second output voltage is normal and receiving the second discharge instruction, controls the first V2G charging pile to select a discharge mode and start discharging, at which time the switch unit is closed, the first V2G charging pile performs DC-AC energy conversion according to the second current parameter, the second V2G charging pile outputs current and performs AC-DC energy conversion, and the first V2G charging pile and the second V2G charging pile perform energy circulation.

[0024] In the V2G bidirectional aging test device described in the present invention, the input unit includes a touch screen, the main controller is communicatively connected with the first V2G charging pile and the second V2G charging pile via a CAN interface, and the switch unit includes a contactor.

[0025] Another technical solution adopted by the present invention to solve its technical problem is to construct a V2G bidirectional aging test system, including a first V2G charging pile, a second V2G charging pile and any one of the aforementioned V2G bidirectional aging test devices.

[0026] Another technical solution adopted by the present invention to solve the technical problem is a V2G bidirectional aging test method. The aforementioned V2G bidirectional aging test system comprises:

[0027] Connect the mains input end of the V2G bidirectional aging test device to the mains power grid, connect the first V2G AC input end to the AC end of the first V2G charging pile, connect the first V2G DC input end to the first DC charging gun of the first V2G charging pile, connect the second V2G AC input end to the AC end of the second V2G charging pile, and connect the second V2G DC input end to the second DC charging gun of the second V2G charging pile;

[0028] The control module of the V2G bidirectional aging test device communicates with the first V2G charging pile and the second V2G charging pile respectively to control the first V2G charging pile and the second V2G charging pile to perform aging in a first aging mode and a second aging mode respectively;

[0029] In the first aging mode, the first V2G charging pile is first set to enter a charging no-output state, and then the second V2G charging pile is set to enter a discharging state to perform DC-AC energy conversion, and then the first V2G charging pile outputs current and performs AC-DC energy conversion;

[0030] In the second aging mode, the second V2G charging pile is first set to enter a charging no-output state, and then the first V2G charging pile is set to enter a discharging state to perform DC-AC energy conversion, and then the second V2G charging pile outputs current and performs AC-DC energy conversion.

[0031] The V2G bidirectional aging test method of the present invention further includes:

[0032] After receiving the first charging instruction, the main controller of the control module controls the first V2G charging pile to select a charging mode and start charging, and sends a first voltage parameter to the first V2G charging pile. The first V2G charging pile starts based on the first voltage parameter. At this time, the switch unit of the control module is disconnected, and the first V2G charging pile has voltage output but no current output;

[0033] The main controller receives a first output voltage from the first V2G charging pile, and after determining that the first output voltage is normal and receiving a first discharge instruction, controls the second V2G charging pile to select a discharge mode and start discharging, at which time the switch unit is closed, the second V2G charging pile performs DC-AC energy conversion according to the first current parameter, the first V2G charging pile outputs current and performs AC-DC energy conversion, and the first V2G charging pile and the second V2G charging pile perform energy circulation;

[0034] After receiving the second charging instruction, the main controller of the control module controls the second V2G charging pile to select a charging mode and start charging, and sends a second voltage parameter to the second V2G charging pile. The second V2G charging pile starts based on the second voltage parameter. At this time, the switch unit of the control module is disconnected, and the second V2G charging pile has voltage output but no current output;

[0035] The main controller receives a second output voltage from the second V2G charging pile, and after determining that the second output voltage is normal and receiving a second discharge instruction, controls the first V2G charging pile to select a discharge mode and start discharging. At this time, the switch unit is closed, the first V2G charging pile performs DC-AC energy conversion according to the second current parameter, the second V2G charging pile outputs current and performs AC-DC energy conversion, and the first V2G charging pile and the second V2G charging pile perform energy circulation.

[0036] The V2G bidirectional aging test device, system and method of the present invention utilize the characteristics of bidirectional energy flow of V2G charging piles without relying on external loads, and can realize back-to-back simultaneous aging of two V2G charging piles, thereby improving V2G aging efficiency; and greatly reduce AC distribution capacity requirements and energy losses through energy circulation, thereby reducing aging test costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0038] Figure 1 It is a principle block diagram of the V2G bidirectional aging test device of the present invention;

[0039] Figure 2 is a circuit diagram of a preferred embodiment of a V2G bidirectional aging test device of the present invention;

[0040] Figure 3 is a circuit diagram of another preferred embodiment of the V2G bidirectional aging test device of the present invention;

[0041] Figure 4 It is a flow chart of the test process of the V2G bidirectional aging test device of the present invention;

[0042] Figure 5 It is a principle block diagram of the V2G bidirectional aging test system of the present invention;

[0043] Figure 6 yes Figure 5 The energy cycle schematic diagram of the V2G bidirectional aging test system in the first aging mode is shown;

[0044] Figure 7 yes Figure 5 The energy cycle diagram of the V2G bidirectional aging test system in the second aging mode is shown. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0046] Figure 1 1 is a schematic diagram of the V2G bidirectional aging test device 100 of the present invention. Figure 1 As shown, the V2G bidirectional aging test device 100 includes a mains input terminal 110, a first V2G AC input terminal 120, a second V2G AC input terminal 130, a first V2G DC input terminal 140, a second V2G DC input terminal 150 and a control module 160. The mains input terminal 110 is connected to the mains power grid, the first V2G AC input terminal 120 is connected to the AC terminal of the first V2G charging pile 200, the first V2G DC input terminal 140 is connected to the first DC charging gun of the first V2G charging pile 200, the second V2G AC input terminal 130 is connected to the AC terminal of the second V2G charging pile 300, and the second V2G DC input terminal 150 is connected to the second DC charging gun of the second V2G charging pile 300.

[0047] Here, the V2G bidirectional aging test device 100 of the present invention can be applied to any V2G DC charging pile, so the first V2G charging pile 200 and the second V2G charging pile 300 respectively include European standard V2G charging pile, Japanese standard V2G charging pile, national standard V2G charging pile and American standard V2G charging pile. Therefore, the corresponding first DC charging gun and the second DC charging gun can be European standard DC charging gun, Japanese standard DC charging gun, national standard DC charging gun and American standard DC charging gun respectively. Correspondingly, the first V2G DC input terminal 140 and the second V2G DC input terminal 150 respectively include European standard DC charging gun holder, Japanese standard DC charging gun holder, national standard DC charging gun holder and American standard DC charging gun holder. Here, the DC charging guns of various standards and the corresponding gun holders, as well as the connection relationship between them, are well known to those skilled in the art and will not be repeated here. The V2G bidirectional aging test device 100 of the present invention can be adapted to various standard V2G charging piles, all of which fall within the protection scope of the present invention.

[0048] Further Figure 1 As shown, the control module 160 communicates with the first V2G charging pile 200 and the second V2G charging pile 300 respectively to control the first V2G charging pile 200 and the second V2G charging pile 300 to achieve bidirectional aging.

[0049] In a preferred embodiment of the present invention, the control module 160 communicates with the first V2G charging pile 200 and the second V2G charging pile 300 respectively to control the first V2G charging pile 200 and the second V2G charging pile 300 to perform aging in the first aging mode and the second aging mode respectively. In a preferred embodiment of the present invention, in the first aging mode, the first V2G charging pile 200 is first set to enter a charging no-output state, and then the second V2G charging pile 300 is set to enter a discharge state to perform DC-AC energy conversion, and then the first V2G charging pile 200 outputs current and performs AC-DC energy conversion. In another preferred embodiment of the present invention, in the second aging mode, the second V2G charging pile 300 is first set to enter a charging no-output state, and then the first V2G charging pile 200 is set to enter a discharge state to perform DC-AC energy conversion, and then the second V2G charging pile 300 outputs current and performs AC-DC energy conversion.

[0050] In another preferred embodiment of the present invention, any method known in the art may be used to control the aging process of the first V2G charging pile 200 and the second V2G charging pile 300 as long as bidirectional aging can be achieved.

[0051] In another preferred embodiment of the present invention, in the first aging mode, the second V2G charging pile 300 is first set to enter the discharge state for DC-AC energy conversion, and then the first V2G charging pile 200 outputs current and performs AC-DC energy conversion; in the second aging mode, the first V2G charging pile 200 is first set to enter the discharge state for DC-AC energy conversion, and then the second V2G charging pile 300 outputs current and performs AC-DC energy conversion. Of course, in other selected embodiments of the present invention, other control steps can be added or reduced, which all fall within the protection scope of the present invention.

[0052] In a preferred embodiment of the present invention, the control module 160 can be any suitable controller, in which BMS simulation software is integrated, and can communicate with the first V2G charging pile 200 and the second V2G charging pile 300 and control the first V2G charging pile 200 and the second V2G charging pile 300 to switch between charging and discharging states, so that by utilizing the characteristics of bidirectional energy flow of V2G charging piles, without relying on external loads, it is possible to achieve back-to-back simultaneous aging of two V2G charging piles, thereby improving V2G aging efficiency. Since the AC capacity provided by the city power network is only the AC-DC conversion loss of the first V2G charging pile 200 and the second V2G charging pile 300 and the power consumption of the device operation, the power required to be greater than or equal to the capacity of the V2G charging pile is greatly reduced compared to conventional resistive loads. Therefore, the V2G bidirectional aging test device 100 of the present invention greatly reduces the AC distribution capacity demand and energy loss through energy circulation, thereby reducing the cost of aging testing.

[0053] Figure 2 1 is a circuit diagram of a preferred embodiment of the V2G bidirectional aging test device of the present invention. Figure 2 As shown, Figure 2 As shown, the V2G bidirectional aging test device of the present invention includes a mains input terminal 110, a first V2G AC input terminal 120, a second V2G AC input terminal 130, a first V2G DC input terminal 140, a second V2G DC input terminal 150 and a control module. The mains input terminal 110 is connected to the mains power grid, the first V2G AC input terminal 120 is connected to the AC terminal of the first V2G charging pile 200, the first V2G DC input terminal 140 is connected to the first DC charging gun of the first V2G charging pile 200, the second V2G AC input terminal 130 is connected to the AC terminal of the second V2G charging pile 300, and the second V2G DC input terminal 150 is connected to the second DC charging gun of the second V2G charging pile 300.

[0054] like Figure 2As shown, in this preferred embodiment, the first V2G charging pile 200 and the second V2G charging pile 300 are respectively national standard V2G charging piles. Therefore, the corresponding first DC charging gun and the second DC charging gun are respectively national standard DC charging guns. Correspondingly, the first V2G DC input terminal 140 and the second V2G DC input terminal 150 are respectively national standard DC charging gun sockets.

[0055] Further Figure 2 As shown, the control module 160 includes a main controller 161, an input unit 162, a switch unit KM and a switch power supply 163. The input unit 162 is used to receive BMS parameters and mode instructions input by the user. The switch unit KM is connected between the first V2G charging pile 200 and the second V2G charging pile 300, and is connected or disconnected under the control of the main controller 161. The main controller 161 is used to send the BMS parameters to the first V2G charging pile 200 and the second V2G charging pile 300, and the first V2G charging pile 200 and the second V2G charging pile 300 perform energy conversion based on the BMS parameters. The main controller 161 is also used to control the first V2G charging pile 200 and the second V2G charging pile 300 to work in the first aging mode and the second aging mode respectively based on the mode instruction.

[0056] In a preferred embodiment of the present invention, the input unit 162 includes a touch screen, the main controller 161 is communicatively connected to the first V2G charging pile 200 and the second V2G charging pile 300 via a CAN interface, and the main controller 161 can be any suitable controller in which BMS simulation software is integrated, and the switch unit KM includes a contactor.

[0057] In a preferred embodiment of the present invention, the mode instruction includes a first charging instruction and a first discharging instruction, a second charging instruction and a second discharging instruction, and the BMS parameters include a first voltage parameter and a first current parameter; a second voltage parameter and a second current parameter.

[0058] The first charging instruction and the first discharging instruction, as well as the first voltage parameter and the first current parameter are applicable to a first aging mode, that is, the first V2G charging pile 200 is charged and the second V2G charging pile 300 is discharged. The second charging instruction and the second discharging instruction, as well as the second voltage parameter and the second current parameter are applicable to a second aging mode, that is, the second V2G charging pile 300 is charged and the first V2G charging pile 200 is discharged.

[0059] Those skilled in the art know that, although in the preferred embodiment, the mode command and the BMS parameter are input through the touch screen as the input unit, in other preferred embodiments of the present invention, the mode command and the BMS parameter may be built-in in the main controller 161, such as stored in the memory of the main controller 161 and called through a program. In a further preferred embodiment of the present invention, the input unit 162 may also be implemented by, for example, a keyboard, a mouse and a display screen, or by a voice input device, etc., all of which fall within the protection scope of the present invention.

[0060] In a preferred embodiment of the present invention, after receiving the first charging instruction, the main controller 161 controls the first V2G charging pile 200 to select a charging mode and start charging, and sends the first voltage parameter to the first V2G charging pile 200. The first V2G charging pile 200 starts based on the first voltage parameter. At this time, the switch unit KM is disconnected, and the first V2G charging pile 200 has voltage output but no current output. The main controller 161 receives the first output voltage from the first V2G charging pile 200, and after determining that the first output voltage is normal and receiving the first discharge instruction, controls the second V2G charging pile 300 to select a discharge mode and start discharging. At this time, the switch unit KM is closed, and the second V2G charging pile 300 performs DC-AC energy conversion according to the first current parameter. The first V2G charging pile 200 outputs current and performs AC-DC energy conversion. The first V2G charging pile 200 and the second V2G charging pile 300 perform energy circulation.

[0061] After the main controller 161 receives the second charging instruction, it controls the second V2G charging pile 300 to select a charging mode and start charging, and sends the second voltage parameter to the second V2G charging pile 300. The second V2G charging pile 300 is started based on the second voltage parameter. At this time, the switch unit KM is disconnected, and the second V2G charging pile 300 has voltage output but no current output; the main controller 161 receives the second output voltage from the second V2G charging pile 300, and after determining that the second output voltage is normal and receiving the second discharge instruction, controls the first V2G charging pile 200 to select a discharge mode and start discharging. At this time, the switch unit KM is closed, the first V2G charging pile 200 performs DC-AC energy conversion according to the second current parameter, the second V2G charging pile 300 outputs current and performs AC-DC energy conversion, and the first V2G charging pile 200 and the second V2G charging pile 300 perform energy circulation.

[0062] In a further preferred embodiment of the present invention, before closing the switch unit KM, the first V2G charging pile 200 or the second V2G charging pile 300 may be self-checked, and after the self-check is completed, a message is sent to the main controller 161, and then the main controller 161 closes the switch unit KM.

[0063] Figure 3 It is a circuit diagram of another preferred embodiment of the V2G bidirectional aging test device of the present invention. Figure 3 The embodiment shown and Figure 2 The embodiment shown is similar, the difference is that the first V2G charging pile 200 and the second V2G charging pile 300 are respectively European standard V2G charging piles. Therefore, the corresponding first DC charging gun and the second DC charging gun are respectively European standard DC charging guns. Correspondingly, the first V2G DC input terminal 140 and the second V2G DC input terminal 150 are respectively European standard DC charging gun holders. It can be seen that the aging test devices of V2G charging piles of different standards are basically the same. It is only necessary to replace the corresponding DC charging gun holder and add the corresponding module (such as the European standard PLC-CAN module). The same is true for other American standard and Japanese standard V2G charging piles, which will not be repeated here.

[0064] Figure 4 This is a flow chart of the test process of the V2G bidirectional aging test device of the present invention. Figures 2 to 4 The testing process of the V2G bidirectional aging testing device of the present invention is specifically described as follows.

[0065] We take two identical V2G charging piles using the V2G bidirectional aging test device of the present invention to perform aging test as an example for explanation, and the rated power of the two V2G charging piles 1#V2G and 1#V2G is both P.

[0066] First, make cable connections, connect the AC input terminal 110 of the V2G bidirectional aging test device 100 to the AC power grid, connect the first V2G AC input terminal 120 to the AC terminal 1#AC of the first V2G charging pile 1#V2G, connect the first V2G DC input terminal 140 to the first DC charging gun 1#DC of the first V2G charging pile 300, connect the second V2G AC input terminal 130 to the AC terminal 2#AC of the second V2G charging pile 1#DC, and connect the second V2G DC input terminal 150 to the second DC charging gun 2#DC of the second V2G charging pile 300.

[0067] Then, the control module 160 of the V2G bidirectional aging test device 100 communicates with the first V2G charging pile 1#V2G and the second V2G charging pile 300 respectively to control the first V2G charging pile 1#V2G and the second V2G charging pile 300 to perform aging in the first aging mode and the second aging mode respectively.

[0068] First, set the BMS parameters 1#BMS and 2#BMS of the first V2G charging pile 200 and the second V2G charging pile 300 on the touch screen. The BMS parameter 1#BMS includes a first voltage parameter and a first current parameter. The BMS parameter 2#BMS includes a second voltage parameter and a second current parameter. In this preferred embodiment, the first voltage parameter and the second voltage parameter can both be set to a voltage U, where the voltage U can be set within the voltage output range of the V2G charging pile. In order to achieve a full-load aging effect, the current parameter setting should make the BMS demand power greater than the output power of the V2G charging pile, and therefore the first current parameter and the second current parameter can both be set to be greater than P / U.

[0069] In the first aging mode, the first charging instruction is triggered on the touch screen to control the first V2G charging pile 200 to select the charging mode and start charging. Then the main controller 161 interacts with the first V2G charging pile 200 to send the BMS parameter 1#BMS to the first V2G charging pile 200. The first V2G charging pile 200 starts normally according to the received BMS parameter 1#BMS. At this time, the switch unit KM is disconnected, so there is no load, there is voltage output but no current output. The main controller 161 receives the first output voltage from the first V2G charging pile 200 and determines whether the first output voltage is normal. Then the first discharge instruction is triggered on the touch screen. After determining that the first output voltage is normal and receiving the first discharge instruction, the main controller 161 controls the second V2G charging pile 300 to select the discharge mode to start the discharge process. The main controller 161 interacts with the second V2G charging pile 300 to exchange initial data. The second V2G charging pile 300 completes the self-check and starts to send communication identification messages periodically. After receiving the message, the main controller 161 closes the contactor KM to inform the second V2G charging pile 300 that it is ready to charge, the DC circuit is turned on, the second V2G charging pile 300 performs DC-AC energy conversion according to the first current parameter, the first V2G charging pile 200 outputs current and performs AC-DC energy conversion, and the first V2G charging pile 200 and the second V2G charging pile 300 perform energy circulation.

[0070] In the second aging mode, it is only necessary to exchange the charging and discharging modes of the first V2G charging pile 200 and the second V2G charging pile 300. This will not be described again.

[0071] As mentioned above, in this preferred embodiment, the BMS parameters 1#BMS and 2#BMS of the first V2G charging pile 200 and the second V2G charging pile 300 can be set on the touch screen. Therefore, by adjusting the voltage and current parameters, aging power control can be performed, which is suitable for V2G devices of various power levels.

[0072] Combination Figure 6-7 It can be seen from the energy cycle diagram shown that the AC capacity provided by the city power supply is only the AC-DC conversion loss of the first V2G charging pile 200 and the second V2G charging pile 300 and the device operation power consumption, which is significantly reduced compared to the conventional resistive load that requires a power greater than or equal to the V2G capacity.

[0073] The V2G bidirectional aging test device of the present invention can realize the back-to-back aging of two V2G charging piles without relying on external loads by utilizing the bidirectional energy flow characteristics of V2G charging piles, thereby improving the V2G aging efficiency; and greatly reducing the AC power distribution capacity demand and energy loss through energy circulation, thereby reducing the aging test cost. Furthermore, the vehicle BMS function is integrated through the main controller, without the need to use a separate vehicle BMS simulator. The current and voltage parameters can be adjusted through the input unit, so that it is suitable for V2G charging piles of different power levels.

[0074] Figure 5 Schematic diagram of the V2G bidirectional aging test system of the present invention. Figure 5 As shown, the V2G bidirectional aging test system of the present invention includes a first V2G charging pile 200, a second V2G charging pile 300 and a V2G bidirectional aging test device 100. Here, the V2G bidirectional aging test device 100 can refer to Figure 1-4 As well as any V2G bidirectional aging test device structure mentioned in the corresponding embodiment, it will not be repeated here.

[0075] The first V2G charging pile 200 and the second V2G charging pile 300 respectively include a European standard V2G charging pile, a Japanese standard V2G charging pile, a Chinese standard V2G charging pile and an American standard V2G charging pile. The first V2G DC input terminal 140 and the second V2G DC input terminal 150 respectively include a European standard DC charging gun socket, a Japanese standard DC charging gun socket, a Chinese standard DC charging gun socket and an American standard DC charging gun socket.

[0076] Figure 6 yes Figure 5 The energy cycle diagram of the V2G bidirectional aging test system in the first aging mode is shown. Figure 7 yes Figure 5The energy cycle diagram of the V2G bidirectional aging test system in the second aging mode is shown.

[0077] Combination Figure 6-7 It can be seen from the energy cycle diagram shown that the AC capacity provided by the city power supply is only the AC-DC conversion loss of the first V2G charging pile 200 and the second V2G charging pile 300 and the device operation power consumption, which is significantly reduced compared to the conventional resistive load that requires a power greater than or equal to the V2G capacity.

[0078] According to the previous description of the V2G bidirectional aging test device of the present invention, the specific implementation mode and principle of the V2G bidirectional aging test system of the present invention are obvious to those skilled in the art and will not be described again here.

[0079] The V2G bidirectional aging test system of the present invention can realize the back-to-back aging of two V2G charging piles without relying on external loads by utilizing the bidirectional energy flow characteristics of V2G charging piles, thereby improving the V2G aging efficiency; and greatly reducing the AC power distribution capacity demand and energy loss through energy circulation, thereby reducing the aging test cost. Furthermore, the vehicle BMS function is integrated through the main controller, without the need to use a separate vehicle BMS simulator. The current and voltage parameters can be adjusted through the input unit, so that it is suitable for V2G charging piles of different power levels.

[0080] In a further preferred embodiment of the present invention, a V2G bidirectional aging test method is also provided, which is applicable to the aforementioned V2G bidirectional aging test system, including: in a first aging mode, first setting the first V2G charging pile 200 to enter a charging no-output state, and then setting the second V2G charging pile 300 to enter a discharging state to perform DC-AC energy conversion, and then the first V2G charging pile 200 outputs current and performs AC-DC energy conversion; in a second aging mode, first setting the second V2G charging pile 300 to enter a charging no-output state, and then setting the first V2G charging pile 200 to enter a discharging state to perform DC-AC energy conversion, and then the second V2G charging pile 300 outputs current and performs AC-DC energy conversion.

[0081] In a further preferred embodiment of the present invention, the V2G bidirectional aging test method further includes: after the main controller 161 of the control module 160 receives the first charging instruction, controlling the first V2G charging pile 200 to select a charging mode and start charging, and sending a first voltage parameter to the first V2G charging pile 200, the first V2G charging pile 200 is started based on the first voltage parameter, at this time, the switch unit KM of the control module 160 is disconnected, and the first V2G charging pile 200 has a voltage output but no current output; the main controller 161 receives a first output voltage from the first V2G charging pile 200, and after determining that the first output voltage is normal and receiving a first discharge instruction, controls the second V2G charging pile 300 to select a discharge mode and start discharging, at this time, the switch unit KM is closed, the second V2G charging pile 300 performs DC-AC energy conversion according to the first current parameter, the first V2G charging pile 200 outputs current and performs AC-DC energy conversion, and the first V2G charging pile 200 and the second V2G charging pile 300 perform energy circulation.

[0082] In a further preferred embodiment of the present invention, the V2G bidirectional aging test method further includes: after the main controller 161 of the control module 160 receives the second charging instruction, controlling the second V2G charging pile 300 to select a charging mode and start charging, and sending a second voltage parameter to the second V2G charging pile 300, the second V2G charging pile 300 is started based on the second voltage parameter, at this time, the switch unit KM of the control module 160 is disconnected, and the second V2G charging pile 300 has a voltage output but no current output; the main controller 161 receives a second output voltage from the second V2G charging pile 300, and after determining that the second output voltage is normal and receiving a second discharge instruction, controls the first V2G charging pile 200 to select a discharge mode and start discharging, at this time, the switch unit KM is closed, the first V2G charging pile 200 performs DC-AC energy conversion according to the second current parameter, the second V2G charging pile 300 outputs current and performs AC-DC energy conversion, and the first V2G charging pile 200 and the second V2G charging pile 300 perform energy circulation.

[0083] In a further preferred embodiment of the present invention, the V2G bidirectional aging test method specifically includes the following steps.

[0084] First, make cable connections, connect the AC input terminal 110 of the V2G bidirectional aging test device 100 to the AC power grid, connect the first V2G AC input terminal 120 to the AC terminal 1#AC of the first V2G charging pile 1#V2G, connect the first V2G DC input terminal 140 to the first DC charging gun 1#DC of the first V2G charging pile 300, connect the second V2G AC input terminal 130 to the AC terminal 2#AC of the second V2G charging pile 1#DC, and connect the second V2G DC input terminal 150 to the second DC charging gun 2#DC of the second V2G charging pile 300.

[0085] Then, the control module 160 of the V2G bidirectional aging test device 100 communicates with the first V2G charging pile 1#V2G and the second V2G charging pile 300 respectively to control the first V2G charging pile 1#V2G and the second V2G charging pile 300 to perform aging in the first aging mode and the second aging mode respectively.

[0086] First, set the BMS parameters 1#BMS and 2#BMS of the first V2G charging pile 200 and the second V2G charging pile 300 on the touch screen. The BMS parameter 1#BMS includes a first voltage parameter and a first current parameter. The BMS parameter 2#BMS includes a second voltage parameter and a second current parameter. In this preferred embodiment, the first voltage parameter and the second voltage parameter can both be set to a voltage U, where the voltage U can be set within the voltage output range of the V2G charging pile. In order to achieve a full-load aging effect, the current parameter setting should make the BMS demand power greater than the output power of the V2G charging pile, and therefore the first current parameter and the second current parameter can both be set to be greater than P / U.

[0087] In the first aging mode, the first charging instruction is triggered on the touch screen to control the first V2G charging pile 200 to select the charging mode and start charging. Then the main controller 161 interacts with the first V2G charging pile 200 to send the BMS parameter 1#BMS to the first V2G charging pile 200. The first V2G charging pile 200 starts normally according to the received BMS parameter 1#BMS. At this time, the switch unit KM is disconnected, so there is no load, there is voltage output but no current output. The main controller 161 receives the first output voltage from the first V2G charging pile 200 and determines whether the first output voltage is normal. Then the first discharge instruction is triggered on the touch screen. After determining that the first output voltage is normal and receiving the first discharge instruction, the main controller 161 controls the second V2G charging pile 300 to select the discharge mode to start the discharge process. The main controller 161 interacts with the second V2G charging pile 300 to exchange initial data. The second V2G charging pile 300 completes the self-check and starts to send communication identification messages periodically. After receiving the message, the main controller 161 closes the contactor KM to inform the second V2G charging pile 300 that it is ready to charge, the DC circuit is turned on, the second V2G charging pile 300 performs DC-AC energy conversion according to the first current parameter, the first V2G charging pile 200 outputs current and performs AC-DC energy conversion, and the first V2G charging pile 200 and the second V2G charging pile 300 perform energy circulation.

[0088] In the second aging mode, it is only necessary to exchange the charging and discharging modes of the first V2G charging pile 200 and the second V2G charging pile 300. This will not be described again.

[0089] According to the previous description of the V2G bidirectional aging test device of the present invention, the specific implementation mode and principle of the V2G bidirectional aging test method of the present invention are obvious to those skilled in the art and will not be described again here.

[0090] The V2G bidirectional aging test method of the present invention can realize the back-to-back aging of two V2G charging piles without relying on external loads by utilizing the bidirectional energy flow characteristics of V2G charging piles, thereby improving the V2G aging efficiency; and greatly reducing the AC power distribution capacity demand and energy loss through energy circulation, thereby reducing the aging test cost. Furthermore, the vehicle BMS function is integrated through the main controller, without the need to use a separate vehicle BMS simulator. The current and voltage parameters can be adjusted through the input unit, so that it is suitable for V2G charging piles of different power levels.

[0091] Although the present invention is described by specific embodiments, it should be understood by those skilled in the art that various changes and equivalent substitutions may be made to the present invention without departing from the scope of the present invention. In addition, various modifications may be made to the present invention for specific situations or materials without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed, but should include all implementation methods falling within the scope of the claims of the present invention.

[0092] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A V2G bidirectional aging test device, characterized in that: It includes a mains input terminal, a first V2G AC input terminal, a second V2G AC input terminal, a first V2G DC input terminal, a second V2G DC input terminal and a control module; The mains input terminal is connected to the mains power grid, the first V2G AC input terminal is connected to the AC terminal of the first V2G charging pile, the first V2G DC input terminal is connected to the first DC charging gun of the first V2G charging pile, the second V2G AC input terminal is connected to the AC terminal of the second V2G charging pile, and the second V2G DC input terminal is connected to the second DC charging gun of the second V2G charging pile; The control module communicates with the first V2G charging pile and the second V2G charging pile respectively to control the first V2G charging pile and the second V2G charging pile to achieve bidirectional aging.

2. The V2G bidirectional aging test device according to claim 1, characterized in that: The control module communicates with the first V2G charging pile and the second V2G charging pile respectively to control the first V2G charging pile and the second V2G charging pile to achieve bidirectional aging, including: The control module communicates with the first V2G charging pile and the second V2G charging pile respectively to control the first V2G charging pile and the second V2G charging pile to age in a first aging mode and a second aging mode respectively.

3. The V2G bidirectional aging test device according to claim 2, characterized in that: The control module communicates with the first V2G charging pile and the second V2G charging pile respectively to control the first V2G charging pile and the second V2G charging pile to age in the first aging mode and the second aging mode respectively, including: In the first aging mode, the first V2G charging pile is first set to enter a charging no-output state, and then the second V2G charging pile is set to enter a discharging state to perform DC-AC energy conversion, and then the first V2G charging pile outputs current and performs AC-DC energy conversion; In the second aging mode, the second V2G charging pile is first set to enter a charging no-output state, and then the first V2G charging pile is set to enter a discharging state to perform DC-AC energy conversion, and then the second V2G charging pile outputs current and performs AC-DC energy conversion.

4. The V2G bidirectional aging test device according to claim 3, characterized in that: The control module includes a main controller, an input unit and a switch unit; The input unit is used to receive battery management system parameters and mode instructions input by a user; The switch unit is connected between the first V2G charging pile and the second V2G charging pile, and is connected or disconnected under the control of the main controller; The main controller is used to send the battery management system parameters to the first V2G charging pile and the second V2G charging pile, and the first V2G charging pile and the second V2G charging pile perform energy conversion based on the battery management system parameters; The main controller is further configured to control the first V2G charging pile and the second V2G charging pile to operate in the first aging mode and the second aging mode respectively based on the mode instruction.

5. The V2G bidirectional aging test device according to claim 4, characterized in that: The mode instruction includes a first charging instruction and a first discharging instruction; the battery management system parameter includes a first voltage parameter and a first current parameter; After receiving the first charging instruction, the main controller controls the first V2G charging pile to select a charging mode and start charging, and sends the first voltage parameter to the first V2G charging pile. The first V2G charging pile starts based on the first voltage parameter. At this time, the switch unit is disconnected, and the first V2G charging pile has voltage output but no current output; The main controller receives a first output voltage from the first V2G charging pile, and after determining that the first output voltage is normal and receiving the first discharge instruction, controls the second V2G charging pile to select a discharge mode and start discharging. At this time, the switch unit is closed, the second V2G charging pile performs DC-AC energy conversion according to the first current parameter, the first V2G charging pile outputs current and performs AC-DC energy conversion, and the first V2G charging pile and the second V2G charging pile perform energy circulation.

6. The V2G bidirectional aging test device according to claim 4 or 5, characterized in that: The mode instruction includes a second charging instruction and a second discharging instruction; the battery management system parameter includes a second voltage parameter and a second current parameter; After receiving the second charging instruction, the main controller controls the second V2G charging pile to select a charging mode and start charging, and sends the second voltage parameter to the second V2G charging pile. The second V2G charging pile starts based on the second voltage parameter. At this time, the switch unit is disconnected, and the second V2G charging pile has voltage output but no current output; The main controller receives a second output voltage from the second V2G charging pile, and after determining that the second output voltage is normal and receiving the second discharge instruction, controls the first V2G charging pile to select a discharge mode and start discharging, at which time the switch unit is closed, the first V2G charging pile performs DC-AC energy conversion according to the second current parameter, the second V2G charging pile outputs current and performs AC-DC energy conversion, and the first V2G charging pile and the second V2G charging pile perform energy circulation.

7. The V2G bidirectional aging test device according to claim 6, characterized in that: The input unit includes a touch screen, the main controller is communicatively connected with the first V2G charging pile and the second V2G charging pile via a CAN interface, and the switch unit includes a contactor.

8. A V2G bidirectional aging test system, characterized in that: It comprises a first V2G charging pile, a second V2G charging pile and a V2G bidirectional aging test device according to any one of claims 1-7.

9. A V2G bidirectional aging test method, applicable to the V2G bidirectional aging test system according to claim 8, characterized in that: include: Connect the mains input end of the V2G bidirectional aging test device to the mains power grid, connect the first V2G AC input end to the AC end of the first V2G charging pile, connect the first V2G DC input end to the first DC charging gun of the first V2G charging pile, connect the second V2G AC input end to the AC end of the second V2G charging pile, and connect the second V2G DC input end to the second DC charging gun of the second V2G charging pile; The control module of the V2G bidirectional aging test device communicates with the first V2G charging pile and the second V2G charging pile respectively to control the first V2G charging pile and the second V2G charging pile to perform aging in a first aging mode and a second aging mode respectively; In the first aging mode, the first V2G charging pile is first set to enter a charging no-output state, and then the second V2G charging pile is set to enter a discharging state to perform DC-AC energy conversion, and then the first V2G charging pile outputs current and performs AC-DC energy conversion; In the second aging mode, the second V2G charging pile is first set to enter a charging no-output state, and then the first V2G charging pile is set to enter a discharging state to perform DC-AC energy conversion, and then the second V2G charging pile outputs current and performs AC-DC energy conversion.

10. The V2G bidirectional aging test method according to claim 9, characterized in that: Further including: After receiving the first charging instruction, the main controller of the control module controls the first V2G charging pile to select a charging mode and start charging, and sends a first voltage parameter to the first V2G charging pile. The first V2G charging pile starts based on the first voltage parameter. At this time, the switch unit of the control module is disconnected, and the first V2G charging pile has voltage output but no current output; The main controller receives a first output voltage from the first V2G charging pile, and after determining that the first output voltage is normal and receiving a first discharge instruction, controls the second V2G charging pile to select a discharge mode and start discharging, at which time the switch unit is closed, the second V2G charging pile performs DC-AC energy conversion according to the first current parameter, the first V2G charging pile outputs current and performs AC-DC energy conversion, and the first V2G charging pile and the second V2G charging pile perform energy circulation; After receiving the second charging instruction, the main controller of the control module controls the second V2G charging pile to select a charging mode and start charging, and sends a second voltage parameter to the second V2G charging pile. The second V2G charging pile starts based on the second voltage parameter. At this time, the switch unit of the control module is disconnected, and the second V2G charging pile has voltage output but no current output; The main controller receives a second output voltage from the second V2G charging pile, and after determining that the second output voltage is normal and receiving a second discharge instruction, controls the first V2G charging pile to select a discharge mode and start discharging. At this time, the switch unit is closed, the first V2G charging pile performs DC-AC energy conversion according to the second current parameter, the second V2G charging pile outputs current and performs AC-DC energy conversion, and the first V2G charging pile and the second V2G charging pile perform energy circulation.

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