Device and method for discharge feedback to the power grid in environmental simulation test of new energy vehicles
By using zero-voltage induction technology in grid-connected inverters and discharge control boxes, rapid, safe, and efficient discharge feedback of new energy vehicles to the grid is achieved in environmental simulation test chambers. This solves the problems of low discharge efficiency and safety hazards in existing technologies, and improves test efficiency and equipment stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- ANHUI JIANGHUAI AUTOMOBILE GRP CORP LTD
- Filing Date
- 2026-03-13
- Publication Date
- 2026-06-02
AI Technical Summary
In the environmental simulation test laboratory for new energy vehicles, existing technologies are insufficient to achieve fast, safe, and efficient discharge feedback to the power grid, especially for vehicles without V2G functionality or those operating in extreme environments where the process is complex and poses safety hazards.
The device employs a combination of grid-connected inverter, discharge control box, and discharge gun. It interacts with the vehicle's BMS through zero-voltage induced technology, enabling the vehicle to discharge autonomously. The power is then fed back to the grid via the grid-connected inverter. Combined with an automatic reconnection mechanism, the continuity and safety of the discharge process are ensured.
It achieves high-power rapid discharge without requiring vehicle hardware modifications, reduces thermal disturbance in the test chamber, improves test efficiency, ensures stable operation of equipment in extreme environments, and saves test time.
Smart Images
Figure CN122136955A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of new energy vehicle technology, and in particular to a device and method for environmental simulation test discharge feedback to the power grid for new energy vehicles. Background Technology
[0002] In the research and development of new energy vehicles, extensive charge-discharge tests are typically conducted in environmental simulation laboratories to verify the vehicle's performance and adaptability under different environmental conditions such as cold and heat. With the rapid iteration of new energy vehicle models, the need for rapid charging and discharging of vehicles in laboratories is becoming increasingly urgent. If efficient discharging cannot be achieved in the laboratory, the vehicle must be moved out of the laboratory for road driving to consume power or connected to an external load before being re-entered into the laboratory. This process is cumbersome, time-consuming, and severely impacts testing efficiency.
[0003] Currently, some vehicles support V2L or V2G functions. V2L typically discharges through the AC charging port, but the discharge power is relatively low. For vehicles with large-capacity battery packs, the discharge time is too long, resulting in low efficiency. While V2G can achieve high-power discharge, it requires the vehicle itself to support the function and a dedicated V2G charging station. However, the test vehicles cover a wide range, from low-end to high-end models, and many vehicles do not have this function. Furthermore, another solution in this field involves disconnecting the vehicle's high-voltage distribution box and connecting a high-power DC electronic load for power consumption. However, this solution is difficult to operate, requires certified professionals, and involves the disassembly of high-voltage components, posing safety hazards, especially when condensation occurs due to temperature changes in the ambient environment.
[0004] Furthermore, existing technologies include vehicle-to-vehicle charging solutions, which primarily utilize the range extender of the discharging vehicle to generate electricity, which is then converted into DC power by an inverter to charge another vehicle. This solution is mainly used in roadside assistance scenarios. Its core lies in using the range extender to continuously generate electricity to power the charging vehicle; the discharging vehicle itself does not feed energy back to the grid, and its discharge process relies on the range extender's active regulation rather than inducing the vehicle's own BMS to discharge. In environmental simulation laboratory scenarios, the test subject is often a single vehicle, requiring the rapid release of its electrical energy back to the grid, rather than charging another vehicle. Therefore, analysis shows that the above solution also cannot solve the technical problem of rapid discharge and grid feedback from a single vehicle in a laboratory setting. Summary of the Invention
[0005] In view of the above, the present invention aims to provide a device and method for discharging and feeding back into the power grid in environmental simulation tests of new energy vehicles, so as to solve the problem in the prior art that new energy vehicles are difficult to discharge quickly, safely and efficiently in environmental simulation test chambers.
[0006] The technical solution adopted in this invention is as follows:
[0007] In a first aspect, the present invention provides a device for discharging and feeding back energy to the grid in an environmental simulation test of a new energy vehicle, comprising: a grid-connected inverter, the AC side of which is connected to the power grid; a discharge gun for connecting to the DC charging port of the new energy vehicle; a discharge control box connected to the DC side of the grid-connected inverter and the discharge gun respectively; and a host computer communicatively connected to the discharge control box; wherein, the discharge control box includes a control motherboard, a relay and a CAN transceiver, and the host computer interacts with the vehicle BMS by controlling the relay and the CAN transceiver to cause the vehicle battery pack to discharge to the grid-connected inverter, feeding electrical energy back to the power grid; after completing the handshake and parameter configuration with the vehicle BMS, the discharge control box controls the output voltage of the positive and negative terminals connected to the discharge gun to be zero, and simultaneously sends a CCS signal containing a requested voltage to the vehicle BMS, so that the voltage of the vehicle battery pack is higher than the voltage on the device side, thereby triggering the vehicle to discharge externally.
[0008] In at least one possible implementation, the discharge control box further includes: a first positive terminal and a first negative terminal for connecting to the DC side of the grid-connected inverter; a second positive terminal and a second negative terminal for connecting to the DC positive and DC negative terminals of the discharge gun; the relay includes a first relay and a second relay, respectively connected in series between the first positive terminal and the second positive terminal, and between the first negative terminal and the second negative terminal; the control motherboard includes a power module, a communication module and the CAN transceiver, the communication module being connected to the host computer via a network cable.
[0009] In at least one possible implementation, the discharge control box further includes an auxiliary power module, the output of which is connected to the positive and negative terminals of the auxiliary power supply of the discharge gun, for providing low-voltage power to the vehicle.
[0010] In at least one of the possible implementations, the housing of the discharge control box is made of metal and consists of a top cover and a main body, with a rubber sealing ring in the middle. The internal circuit board is potted to adapt to the condensation conditions in the environmental simulation test chamber.
[0011] Secondly, the present invention also provides a method for discharging and feeding back to the power grid in environmental simulation tests of new energy vehicles based on the above-mentioned device, comprising the following steps:
[0012] Insert the discharge gun into the DC charging port of the new energy vehicle, connect the grid-connected inverter to the power grid, and connect the host computer to the discharge control box.
[0013] The host computer sets the discharge parameters and controls the discharge control box to handshake and configure parameters with the vehicle BMS;
[0014] After completing the parameter configuration, the discharge control box controls the output voltage of the positive and negative terminals connected to the discharge gun to be zero, and at the same time sends a CCS signal containing the requested voltage to the vehicle BMS, so that the vehicle battery pack voltage is higher than the device side voltage, triggering the vehicle to discharge externally.
[0015] The DC power from the vehicle battery pack is transmitted to the grid-connected inverter via the discharge gun and discharge control box, and the grid-connected inverter converts it into AC power to be fed back to the grid.
[0016] During the discharge process, the discharge control box monitors the discharge status in real time. When the discharge is interrupted, it automatically disconnects and reconnects the relay, and controls the DC CC1 resistor of the discharge gun to simulate re-insertion of the gun and restart the discharge process.
[0017] In at least one of the possible implementations, the discharge control box communicates with the vehicle's BMS based on a predetermined standard, and in the CML message sent during the parameter configuration phase, the maximum voltage is set to 1500V to be compatible with vehicles on different voltage platforms.
[0018] In at least one of the possible implementations, when the vehicle BMS detects an error and interrupts the discharge due to prolonged discharge, the chip inside the discharge control box controls the disconnection of the first and second relays, disconnects the auxiliary power module and CAN communication, and simultaneously controls the CC1 resistor of the discharge gun to disconnect, simulating the gun-pulling action. After a delay, the CC1 resistor is closed again, the auxiliary power is provided again, the CAN communication is reactivated, and steps S2 to S4 are executed again to allow the discharge to continue.
[0019] In at least one of the possible implementations, the discharge parameters include the discharge current and the target SOC; in step S5, the discharge control box obtains the vehicle battery information in real time through the CAN transceiver and forwards it to the host computer. When the battery SOC drops to the target SOC, the discharge control box sends a CST stop charging message to the vehicle to end the discharge.
[0020] Compared to existing technologies, the zero-voltage induced discharge mechanism proposed in this invention does not drive current flow through active voltage boosting or using range extender power generation. Instead, it utilizes the voltage comparison logic in existing DC charging protocols, causing the vehicle's BMS to autonomously determine and close the internal discharge relay by making the output voltage on the control device side zero. This reverse-thinking approach allows any new energy vehicle that meets industry standards to achieve external discharge without any hardware or software modifications, significantly outperforming traditional solutions that rely on the vehicle's own V2G function or range extender power generation. This invention ensures that electrical energy is directly fed back to the grid through a grid-connected inverter, enabling energy recovery and utilization. Simultaneously, the main energy conversion during discharge occurs at the grid-connected inverter outside the test chamber, releasing minimal heat within the test chamber and causing no disturbance to the temperature stability of the environmental chamber, thus ensuring the accuracy of environmental simulation tests. In particular, there is no need to restore the test chamber temperature to the outside ambient temperature before removing the vehicle during discharge; direct connection to this device enables high-power, rapid discharge. Practical calculations show that each test can save 5-10 hours, significantly improving R&D testing efficiency.
[0021] Specifically addressing the issue of BMS (Battery Management System) reporting errors and interrupting operation when monitoring discharge current for extended periods in some vehicle models, this invention incorporates a unique automatic reconnection mechanism. This mechanism simulates the entire process of physically unplugging and replugging the discharge gun by controlling the on / off state of the relays and discharge gun resistors within the discharge control box. This tricks the BMS into recognizing a fresh charging connection, allowing continued discharge. This mechanism ensures the continuity and reliability of the discharge process, effectively resolving the BMS strategy interference problem.
[0022] Furthermore, this invention features a discharge control box structure specifically designed for the testing environment. It employs a metal sealed shell, rubber sealing rings, and internal circuit potting treatment, which can effectively resist the effects of extreme temperature changes and condensation in the testing chamber, ensuring the long-term stable operation of the equipment under harsh conditions. This reflects a deep consideration and targeted design for specific application scenarios. Attached Figure Description
[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described below with reference to the accompanying drawings, wherein:
[0024] Figure 1 This is a schematic diagram of the structure of a fast discharge feedback grid device for new energy vehicles provided in an embodiment of the present invention;
[0025] Figure 2 This is a schematic diagram of the internal structure of the discharge control box provided in an embodiment of the present invention. Detailed Implementation
[0026] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.
[0027] This invention proposes an embodiment of a device for discharging and feeding back into the power grid in environmental simulation tests of new energy vehicles, such as... Figure 1 As shown, it mainly consists of four parts: a grid-connected inverter, a discharge control box, a discharge gun, and a host computer. Specifically, the AC side of the grid-connected inverter is connected to the power grid, and the discharge gun is connected to the DC charging port of the new energy vehicle; the discharge control box is connected to both the DC side of the grid-connected inverter and the discharge gun; and the host computer is communicatively connected to the discharge control box.
[0028] The grid-connected inverter can be a commercially available, 120kW grid-connected inverter product. Its AC side is connected to the three-phase power grid in the distribution room via a three-phase five-wire cable to achieve power feedback; its DC side is connected to the discharge control box via 3*95mm²+2*50mm² cables. Furthermore, the grid-connected inverter has an RS485 communication interface, through which it connects to a host computer to receive control commands such as start, stop, and power adjustment.
[0029] For the discharge control box, in some embodiments, its housing dimensions are designed to be 400mm long, 200mm wide, and 150mm high. It is made of metal and consists of a top cover and a main body, preferably with a rubber sealing ring in the middle. The internal circuit board is potted. This design provides it with good waterproof and dustproof capabilities, enabling it to withstand harsh conditions such as condensation that may occur in environmental simulation test chambers, ensuring electrical safety. Specifically, as shown... Figure 2 As shown, the main body of the discharge control box contains the following key components and their connections:
[0030] (1) It is provided with a first positive terminal A1 and a first negative terminal A2 connected to the DC side of the grid-connected inverter; and a second positive terminal A3 and a second negative terminal A4 connected to the DC positive and negative poles of the discharge gun.
[0031] (2) A first relay K1 and a second relay K2 are provided. The first relay K1 is connected to A1 and A3 respectively through copper busbars T1 and T2; the second relay K2 is connected to A2 and A4 respectively through copper busbars T3 and T4; and the aforementioned host computer can control the connection and disconnection of the main discharge circuit by controlling the on and off of K1 and K2.
[0032] (3) The control core of the mainboard Z0 discharge control box integrates the power supply module P0, the auxiliary power supply module P1, the communication module T0 and the CAN transceiver C0. The power module P0 is used to obtain power from an external source, such as 12V DC, which powers the various modules on the control board through pins D1 and D2. The auxiliary power module P1 outputs 12V DC, which is connected to the positive A+ and negative A- terminals of the auxiliary power supply of the discharge gun through pins D3 and D4. It is used to power the vehicle's low-voltage battery or wake up the vehicle's BMS during the discharge handshake phase. The communication module T0 provides an RJ45 network cable interface J0, which is used to connect to the host computer via a network cable, receive discharge parameters and control commands from the host computer, and report the discharge status and vehicle battery information to the host computer. The CAN transceiver C0 preferably supports the J1939 protocol. Its CANH pin H and CANL pin L are connected to the CAN communication lines S+ and S- of the discharge gun, respectively. Thus, through the CAN bus, the discharge control box can communicate with the vehicle's BMS in accordance with industry standards, such as, but not limited to, GB / T 27930-2015 "Communication Protocol between Off-board Conductive Chargers and Battery Management Systems for Electric Vehicles".
[0033] Continuing from the previous text, the mechanical structure and electrical interface of the discharge gun can meet industry requirements, such as following the standard "GBT20234.3-2023 Electric Vehicle Conductive Charging Connection Device Part 3: DC Charging Interface". This invention will not elaborate further or limit these aspects. In conjunction with the previous embodiment, the DC positive and negative terminals DC+ and DC- of the discharge gun are connected to terminals A3 and A4 inside the discharge control box; the auxiliary power terminals A+ and A- are connected to terminals D3 and D4 inside the control box; the CAN communication terminals S+ and S- are connected to pins H and L inside the control box; furthermore, a relay controlled by the control board is added to the CC1 (connection confirmation) resistor circuit of the discharge gun to simulate insertion and removal signals, which is crucial in the automatic reconnection process.
[0034] Finally, for the host computer, the preferred configuration is a computer with dedicated control software installed. The test personnel input parameters such as discharge current and target SOC through the host computer software interface. The software sends instructions to the discharge control box via network cable and receives and displays vehicle battery information such as voltage, current, SOC, and temperature in real time during the discharge process.
[0035] Corresponding to the above embodiments of the device, the method for realizing rapid discharge feedback to the power grid can be referred to as follows:
[0036] Step S1, according to Figure 1As shown, complete the physical connection of all devices: insert the discharge gun into the DC charging port of the new energy vehicle under test, confirm that the grid-connected inverter has been reliably connected to the grid, connect the discharge control box to the DC side of the grid-connected inverter through a 20mm² copper cable, connect it to the discharge gun through another 20mm² copper cable, and connect the network port J0 of the discharge control box to the host computer using a network cable.
[0037] Step S2: The tester inputs the desired discharge current value (e.g., 100A) and discharge termination SOC (e.g., 30%) into the host computer software. The host computer sends the command to the discharge control box. The control motherboard Z0 in the discharge control box first provides 12V low-voltage auxiliary power to the vehicle through the discharge gun via the auxiliary power module P1's D3 and D4, waking up the vehicle's BMS. Subsequently, the control motherboard starts handshaking and parameter configuration with the vehicle's BMS through the CAN transceiver C0 and the discharge gun's S+ / S- lines in accordance with the GB / T 27930-2015 protocol.
[0038] To add further, during the handshake phase, the discharge control box can simulate the role of a DC charger, sending CHM, CRM, CML, and other messages to the vehicle in sequence. In particular, when sending the charger's maximum output capacity message CML, the maximum voltage parameter is set to 1500V. This setting is to cover the battery pack voltage platform of the vast majority of mainstream electric vehicles on the market, ensuring the device's broad compatibility.
[0039] Step S3: After completing the parameter configuration, during the normal charging process, the vehicle will send a Battery Charging Request Message (BCL), which includes the voltage and current requested by the vehicle. After receiving the BCL, the discharge control box performs a crucial reverse operation: it controls the voltage of its output terminals A3 and A4 to remain at 0V, but simultaneously, the output voltage value carried in the charger charging status message (CCS) sent to the vehicle's BMS is set to the same value as the voltage requested by the vehicle.
[0040] Furthermore, according to the DC charging protocol, the vehicle's BMS continuously monitors the charger's output voltage. When the BMS detects that the charger's output voltage is significantly lower than its own battery pack voltage (e.g., 600V), the vehicle's BMS determines that the charger is in a "no power supply" state and will actively close the high-voltage discharge relay inside the vehicle to begin discharging. At this time, the current direction is opposite to that during charging, flowing out of the vehicle's battery pack, through the discharge gun and discharge control box (where K1 and K2 are already closed), and then to the grid-connected inverter. This zero-voltage induced discharge mechanism is one of the core concepts of this invention, which utilizes the charging protocol in reverse to enable vehicles without V2G functionality to actively discharge.
[0041] Step S4: The DC power flowing into the grid-connected inverter is converted into three-phase AC power with the same frequency and phase as the grid through its internal power module. This AC power is then fed back to the grid via a three-phase five-wire cable, achieving energy recovery and utilization. During this process, since the high-power conversion occurs in the grid-connected inverter outside the test chamber, only a small amount of current flows through the cables and discharge control box inside the environmental chamber, generating minimal heat. Therefore, this does not disturb the temperature field within the environmental chamber, ensuring the stability of the test environment.
[0042] Step S5: During the discharge process, some vehicle models have stricter BMS strategies. When a discharge current lasting for a long time (e.g., several minutes) is detected, it may be considered an abnormal state and an error will be reported, interrupting the discharge and disconnecting the internal relay, causing the discharge to stop. To solve this problem, in some preferred embodiments of the present invention, an automatic reconnection mechanism is integrated into the control program of the discharge control box. The discharge control box continuously monitors the discharge status via the CAN bus. Once it detects that the discharge current is interrupted due to a BMS error, such as detecting a CAN communication interruption or a specific error frame, the control motherboard Z0 will immediately perform the following operations:
[0043] Step S51: Disconnect relays K1 and K2 to cut off the main discharge circuit;
[0044] Step S52: Disconnect the outputs D3 and D4 of the auxiliary power module P1, and disconnect the CAN transceiver C0 from S+ / S-.
[0045] Step S53: Disconnect the relay in the CC1 circuit inside the discharge gun to simulate the gun-pulling action;
[0046] Step S54: After a brief delay (e.g., 2 seconds), following the initial power-on procedure, the CC1 circuit relay is re-closed, the 12V auxiliary power supply is restored, CAN communication is reactivated, and the handshake and discharge triggering procedures of steps S2 and S3 are executed again. The entire process is completed within seconds, imperceptible to the operator, but successfully "tricks" the vehicle's BMS into believing it is a brand new charging connection, thus allowing discharge to resume. This simulated plug-in automatic reconnection strategy ensures that the discharge process can continue until the preset conditions are met.
[0047] Finally, in step S6, during the discharge process, the discharge control box obtains real-time battery information (such as SOC, voltage, current, temperature, etc.) from the vehicle via the CAN transceiver C0 and forwards it to the host computer for display and recording via the communication module T0. When the host computer detects that the battery SOC has dropped to the target SOC set in step S2 (such as 30%), or the test personnel manually click the stop button on the host computer software, the host computer will send a stop command to the discharge control box. The discharge control box then sends a stop charging message CST to the vehicle BMS according to the protocol. After receiving the message, the vehicle BMS disconnects the internal relay, the discharge process ends, and then the discharge control box disconnects relays K1 and K2, terminating the entire process.
[0048] In this invention, when directional terms are mentioned, they are relative concepts based on the embodiments. Furthermore, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent the existence of A alone, A and B simultaneously, or B alone. A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects have an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, and c can represent: a, b, c, a and b, a and c, b and c, or a and b and c, where a, b, and c can be single or multiple.
[0049] The above description of the structure, features, and effects of the present invention is based on the embodiments shown in the figures. However, the above are only preferred embodiments of the present invention. It should be noted that the technical features involved in the above embodiments and their preferred methods can be reasonably combined and matched by those skilled in the art to form a variety of equivalent solutions without departing from or changing the design concept and technical effects of the present invention. Therefore, the present invention is not limited to the scope of implementation shown in the figures. Any changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments, that do not exceed the spirit covered by the specification and figures, should be within the protection scope of the present invention.
Claims
1. A device for discharging and feeding back into the power grid during environmental simulation tests of new energy vehicles, characterized in that, include: Grid-connected inverters have their AC side connected to the power grid; The discharge gun is used to connect to the DC charging port of new energy vehicles. The discharge control box is connected to the DC side of the grid-connected inverter and the discharge gun, respectively. as well as, The host computer is communicatively connected to the discharge control box; The discharge control box includes a control motherboard, a relay, and a CAN transceiver. The host computer interacts with the vehicle BMS by controlling the relay and the CAN transceiver to discharge the vehicle battery pack to the grid-connected inverter and feed electrical energy back to the grid. After completing the handshake and parameter configuration with the vehicle BMS, the discharge control box controls the output voltage of its positive and negative terminals connected to the discharge gun to zero, and at the same time sends a charger charging status message containing a request for voltage to the vehicle BMS, so that the vehicle battery pack voltage is higher than the device side voltage, thereby triggering the vehicle to discharge externally.
2. The device for discharging and feeding back to the power grid in environmental simulation testing of new energy vehicles according to claim 1, characterized in that, The discharge control box also includes: The first positive terminal and the first negative terminal are used to connect to the DC side of the grid-connected inverter; The second positive terminal and the second negative terminal are used to connect the DC positive terminal and the DC negative terminal of the discharge gun; The relay includes a first relay and a second relay, which are connected in series between the first positive terminal and the second positive terminal, and between the first negative terminal and the second negative terminal, respectively. The control motherboard includes a power module, a communication module, and a CAN transceiver. The communication module is connected to the host computer via a network cable.
3. The device for discharging and feeding back to the power grid in environmental simulation testing of new energy vehicles according to claim 2, characterized in that, The discharge control box also includes an auxiliary power supply module, the output of which is connected to the positive and negative terminals of the auxiliary power supply of the discharge gun, for providing low-voltage power to the vehicle.
4. The device for discharging and feeding back to the power grid in environmental simulation testing of new energy vehicles according to claim 2, characterized in that, The discharge control box has a metal shell consisting of a top cover and a main body, with a rubber sealing ring in the middle. The internal circuit board is potted to adapt to the condensation conditions in the simulated test chamber.
5. A method for discharging and feeding back to the power grid in an environmental simulation test of a new energy vehicle based on the device described in any one of claims 1 to 4, characterized in that, include: Insert the discharge gun into the DC charging port of the new energy vehicle, connect the grid-connected inverter to the power grid, and connect the host computer to the discharge control box. The host computer sets the discharge parameters and controls the discharge control box to handshake and configure parameters with the vehicle BMS; After completing the parameter configuration, the discharge control box controls the output voltage of the positive and negative terminals connected to the discharge gun to be zero, and at the same time sends a charger charging status message containing the requested voltage to the vehicle BMS, so that the vehicle battery pack voltage is higher than the device side voltage, triggering the vehicle to discharge externally. The DC power from the vehicle battery pack is transmitted to the grid-connected inverter via the discharge gun and discharge control box, and the grid-connected inverter converts it into AC power to be fed back to the grid. During the discharge process, the discharge control box monitors the discharge status in real time. When a discharge interruption is detected, it automatically disconnects and reconnects the relay, and controls the resistance of the discharge gun to simulate re-insertion of the gun and restart the discharge process.
6. The method for discharging and feeding back to the power grid in environmental simulation tests of new energy vehicles according to claim 5, characterized in that, The handshake and parameter configuration between the discharge control box and the vehicle BMS specifically includes: the discharge control box communicates with the vehicle BMS based on a predetermined standard, and in the charger maximum output capacity message sent during the parameter configuration phase, the maximum voltage is set to 1500V to be compatible with vehicles of different voltage platforms.
7. The method for discharging and feeding back to the power grid in environmental simulation tests of new energy vehicles according to claim 5, characterized in that, The restart discharge process specifically includes: When the vehicle BMS detects an error and interrupts the discharge due to prolonged discharge, the internal chip of the discharge control box controls the disconnection of the relay, disconnects the auxiliary power module and CAN communication, and simultaneously controls the discharge gun's resistor to disconnect, simulating the gun-pulling action; after a delay, the discharge gun's resistor is closed again, the auxiliary power is restored, the CAN communication is reactivated, and the discharge steps are executed.
8. The method for discharging and feeding back to the power grid in environmental simulation tests of new energy vehicles according to claim 5, characterized in that, The discharge parameters include the discharge current and the target SOC; During the process of the discharge control box acquiring vehicle battery information in real time through the CAN transceiver and forwarding it to the host computer, when the battery SOC drops to the target SOC, the discharge control box sends a stop charging message to the vehicle to end the discharge.