Movable detection device for V2G charging and discharging pile

Abstract

The invention belongs to the technical field of power grid equipment detection, and particularly provides a movable detection device for a V2G charging and discharging pile, which comprises a main control module, an energy storage battery, a first charging and discharging interface, a second charging and discharging interface, a bidirectional direct current converter, a BMS communication simulation module and a battery monitoring module, a compact movable structure is formed, limitation on actual vehicles and fixed sites is eliminated, detection work is allowed to be flexibly deployed in different sites, and the detection efficiency is remarkably improved. The built-in energy storage battery is used for replacing actual vehicle charging and discharging, so that the battery of the electric vehicle is prevented from being damaged, and the detection cost is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of power grid equipment detection, and in particular relates to a movable detection device for a V2G charging and discharging pile. Background Art

[0002] With the rapid development of the new energy vehicle industry, especially the increasing maturity of the interaction technology between electric vehicles (EV) and the grid (V2G, Vehicle-to-Grid), V2G charging and discharging piles, as key equipment connecting electric vehicles and smart grids, are directly related to the stability and economy of the entire power system. V2G technology not only allows electric vehicles to supply power to the grid when needed, but also stores electrical energy when the grid load is low, realizing the two-way flow and efficient use of energy. Therefore, on-site service opening and testing of V2G charging and discharging piles has become particularly important.

[0003] However, the existing V2G charging and discharging pile detection methods have many limitations. Traditional detection methods usually rely on the cooperation between actual vehicles and detection equipment. This method is not only limited by the availability of sites and vehicles, but also the frequent high-intensity charging and discharging tests pose a threat to the battery life of the vehicle and increase the detection cost. In addition, with the continuous iteration of new energy vehicle technology, various new standards of charging interfaces have gradually become popular, which has put forward higher requirements for the compatibility and flexibility of detection equipment. The lag and cost control of car companies in updating interface standards have further aggravated the difficulty of on-site detection. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention provides a movable detection device for a V2G charging and discharging pile to solve the above-mentioned technical problems.

[0005] The present invention provides a movable detection device for a V2G charging and discharging pile, comprising a main control module, an energy storage battery, a first charging and discharging interface, a second charging and discharging interface, a bidirectional DC converter, a BMS communication simulation module and a battery monitoring module; The first power supply end of the first charge and discharge interface and the first power supply end of the second charge and discharge interface are both connected to an external V2G charge and discharge pile to be detected, the second power supply end of the first charge and discharge interface and the second power supply end of the second charge and discharge interface are both connected to the first end of the energy storage battery through a bidirectional DC converter, and the second end of the energy storage battery is connected to the main control module through a battery monitoring module; the first communication end of the first charge and discharge interface and the first communication end of the second charge and discharge interface are both connected to the external V2G charge and discharge pile to be detected, and the second communication end of the first charge and discharge interface and the second communication end of the second charge and discharge interface are both connected to the main control module through a BMS communication simulation module; The main control module is used to control the charge and discharge conversion of the bidirectional DC converter, control the battery monitoring module and receive the status information of the energy storage battery collected by the battery monitoring module, and control the BMS communication simulation module so that it can complete the communication protocol transmission with the external V2G charging and discharging pile to be detected.

[0006] A further improvement of the present invention is that it also includes an AC / DC converter and an AC charging interface, wherein a first end of the AC charging interface is connected to a third end of the energy storage battery through the AC / DC converter, a second end of the AC charging interface is connected to an external mains power supply, and the AC / DC converter is also connected to a main control module, and the main control module is also used to control the AC / DC converter to perform compensation charging on the energy storage battery.

[0007] A further improvement of the present invention further includes a communication interface and a host computer, and the main control module is connected to the host computer via the communication interface.

[0008] A further improvement of the present invention also includes a shell, in which the main control module, the energy storage battery, the bidirectional DC converter, the BMS communication simulation module, the battery monitoring module and the AC / DC converter are all arranged in the shell, and the first charge and discharge interface, the second charge and discharge interface, the AC charging interface and the communication interface are all arranged on one side of the shell.

[0009] A further improvement of the present invention further comprises a heat dissipation fan and a heat dissipation net, wherein the heat dissipation fan is arranged inside the shell, and the heat dissipation net is arranged on the side of the shell.

[0010] A further improvement of the present invention is that it also includes a pair of handles, which are arranged on opposite sides of the shell.

[0011] A further improvement of the present invention is that it also includes a plurality of universal wheels, which are arranged at the bottom end of the shell.

[0012] A further improvement of the present invention is that the status information of the energy storage battery includes voltage, SOC, temperature information of the entire battery and voltage, SOC and temperature information of the single battery.

[0013] The beneficial effect of the present invention is that the V2G charging and discharging pile movable detection device proposed by the present invention integrates high flexibility, portability, cost-effectiveness, wide compatibility, efficient data collection and monitoring, and comprehensive detection capabilities. It integrates the main control module, energy storage battery, dual charging and discharging interface, bidirectional DC converter and BMS communication simulation module to form a compact and movable structure, which gets rid of the restrictions on actual vehicles and fixed sites, allows the detection work to be flexibly deployed in different locations, and significantly improves the detection efficiency. By replacing the actual vehicle charging and discharging with the built-in energy storage battery, it not only protects the electric vehicle battery from loss, but also reduces the detection cost. Its dual interface design and BMS communication simulation module ensure wide compatibility, and can flexibly respond even in the face of rapidly iterating charging interface standards. The built-in battery monitoring module of the device collects the energy storage battery status information in real time, and the main control module accurately controls the charging and discharging process to achieve efficient and safe detection. In addition, the device can fully simulate the charging and discharging behavior of electric vehicles, and communicate with the V2G charging and discharging pile in two directions, deeply test its charging performance, discharge feedback efficiency and V2G functional stability, and provide solid support for the stability and economic operation of the power system.

[0014] In addition, the invention has a reliable design principle, a simple structure and a very broad application prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 is a schematic block diagram of the movable detection device.

[0017] Figure 2 It is a schematic diagram of the structure of the movable detection device.

[0018] 110 is the main control module, 120 is the energy storage battery, 131 is the first charge and discharge interface, 132 is the second charge and discharge interface, 140 is the bidirectional DC converter, 150 is the BMS communication simulation module, 160 is the battery monitoring module, 171 is the AC / DC converter, 172 is the AC charging interface, 180 is the communication interface, 191 is the housing, 192 is the heat dissipation net, 193 is the handle, and 194 is the universal wheel. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0021] like Figure 1 and Figure 2 As shown, the present invention provides a movable detection device for a V2G charging and discharging pile, comprising a main control module, an energy storage battery, a first charging and discharging interface, a second charging and discharging interface, a bidirectional DC converter, a BMS communication simulation module and a battery monitoring module; the first power supply end of the first charging and discharging interface and the first power supply end of the second charging and discharging interface are both connected to an external V2G charging and discharging pile to be detected, the second power supply end of the first charging and discharging interface and the second power supply end of the second charging and discharging interface are both connected to the first end of the energy storage battery through the bidirectional DC converter, and the second end of the energy storage battery is connected to the main control module through the battery monitoring module; the first communication end of the first charging and discharging interface and the first communication end of the second charging and discharging interface are both connected to the external V2G charging and discharging pile to be detected, and the second communication end of the first charging and discharging interface and the second communication end of the second charging and discharging interface are both connected to the main control module through the BMS communication simulation module.

[0022] In order to improve the V2G charging and discharging pile movable detection device, the present invention adopts a dual-interface design, and the first charging and discharging interface and the second charging and discharging interface adopt DC charging interfaces specified by different standards. For example, the first charging and discharging interface uses a DC charging interface that complies with the GB / T 20234.3-2023 standard, and can be connected to a V2G charging pile that complies with the GB / T 20234.3-2023 standard; the second charging and discharging interface uses a DC charging interface that complies with the GB / T 20234.4-2023 standard, and can be connected to a V2G charging pile that complies with the GB / T 20234.4-2023 standard.

[0023] Among them, the main control module is used to control the charging and discharging conversion of the bidirectional DC converter, control the battery monitoring module and receive the status information of the energy storage battery collected by the battery monitoring module, and control the BMS communication simulation module so that it can complete the communication protocol transmission with the external V2G charging and discharging pile to be detected.

[0024] The bidirectional DC converter is used to realize the flow and conversion of DC power between the V2G charging and discharging pile and the energy storage battery. It can change the voltage and current and is controlled by the main control module. When the V2G charging and discharging pile is charging, the electric energy is transmitted from the power grid to the energy storage battery through the V2G charging and discharging pile, simulating the charging behavior of electric vehicles; when the V2G charging and discharging pile is discharging, the electric energy is transmitted from the energy storage battery to the power grid through the V2G charging and discharging pile, simulating the discharging behavior of electric vehicles. It can realize functions such as voltage and current change control, charge and discharge direction conversion control (realized by bidirectional DC converter), etc.

[0025] The working principle of the bidirectional DC converter is based on pulse width modulation (PWM) technology. The core is to use the high-frequency switching operation of the power electronic switch to achieve voltage conversion and energy transfer. By adjusting the duty cycle of the power switch device, the size and direction of the output voltage can be controlled. When the duty cycle is greater than 50%, the electric energy flows from the input side to the output side; when the duty cycle is less than 50%, the electric energy flows from the output side to the input side. With advanced power switching devices and optimized control strategies, the conversion efficiency of the bidirectional DC converter can reach more than 90%. With fully controlled power switching devices and protection circuits, it has smaller output voltage fluctuations and pulsations, and can provide stable output power quality.

[0026] There are two main modes of bidirectional DC converters: boost mode and buck mode. In boost mode, the converter converts the DC voltage on the low voltage side into the voltage required by the high voltage side; while in buck mode, the converter reduces the voltage on the high voltage side to the level required by the low voltage side. The switching of these two modes is determined by the main control module according to the actual working status and needs of the circuit. When charging, the converter operates in buck mode, converting the higher voltage provided by the charging pile into the lower voltage required by the battery pack; when discharging, the converter switches to boost mode to increase the voltage of the battery pack to supply the charging pile.

[0027] The battery monitoring module is used to collect the status information of the energy storage battery and upload the collection results to the main control module. The main control module stores a safety protection program. When the energy storage battery is abnormal, the device's own safety protection mechanism is triggered to shut down or limit charging and discharging. The status information of the energy storage battery includes the voltage, SOC, temperature information of the entire battery and the voltage, SOC and temperature information of the single battery.

[0028] The energy storage battery is used to simulate the battery of an electric vehicle and realize the charge and discharge detection with the V2G charging and discharging pile. The capacity is 20kWh. It is used to provide electricity for the entire equipment and each module.

[0029] The BMS communication simulation module is used to simulate the battery management system (BMS) of electric vehicles, and conducts charging and discharging communication with the V2G charging and discharging pile through the first charging and discharging interface or the second charging and discharging interface, including confirmation of the consistency of the communication protocol, and identifies and processes the transmitted message information, and uploads the acquired information to the main control module via the internal communication transmission path of the device.

[0030] In addition, the device also includes a communication interface and a host computer, and the main control module is connected to the host computer through the communication interface. The main control module can feed back various received data information and communication control information to the host computer through the communication interface, and can also receive control instructions issued by the host computer through the communication interface.

[0031] In addition, the device also includes an AC / DC converter and an AC charging interface. The first end of the AC charging interface is connected to the third end of the energy storage battery through the AC / DC converter, and the second end of the AC charging interface is connected to the external mains. The AC / DC converter is also connected to the main control module, and the main control module is also used to control the AC / DC converter to compensate for charging the energy storage battery. When the device is used for too much discharge business, resulting in the battery capacity of the energy storage battery being too low, compensation charging can be performed during non-detection business time to convert the connected AC power into DC power.

[0032] Furthermore, the device is also provided with a shell, and the main control module, energy storage battery, bidirectional DC converter, BMS communication simulation module, battery monitoring module and AC / DC converter are all arranged in the shell, and the first charge and discharge interface, the second charge and discharge interface, the AC charging interface and the communication interface are all arranged on one side of the shell. In order to improve the service life of the device, the device is also provided with a heat dissipation fan and a heat dissipation net, the heat dissipation fan is arranged in the shell, and the heat dissipation net is arranged on the side of the shell, so as to facilitate the cooling of each operating module in the device.

[0033] In order to facilitate the inspectors to move the inspection device, the inspection device is also provided with a pair of handles and four universal wheels at the bottom end of the shell, and the handles are provided on opposite sides of the shell.

[0034] Although the present invention has been described in detail with reference to the accompanying drawings and in combination with the preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, a person of ordinary skill in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and these modifications or substitutions shall be within the scope of the present invention. Any person of ordinary skill in the art may easily think of changes or substitutions within the technical scope disclosed by the present invention, and these shall be within the scope of protection of the present invention.

Claims

1. A portable detection device for a V2G charging and discharging pile, characterized in that: It includes a main control module, an energy storage battery, a first charge and discharge interface, a second charge and discharge interface, a bidirectional DC converter, a BMS communication simulation module and a battery monitoring module; The first power supply end of the first charge and discharge interface and the first power supply end of the second charge and discharge interface are both connected to an external V2G charge and discharge pile to be detected, the second power supply end of the first charge and discharge interface and the second power supply end of the second charge and discharge interface are both connected to the first end of the energy storage battery through a bidirectional DC converter, and the second end of the energy storage battery is connected to the main control module through a battery monitoring module; the first communication end of the first charge and discharge interface and the first communication end of the second charge and discharge interface are both connected to the external V2G charge and discharge pile to be detected, and the second communication end of the first charge and discharge interface and the second communication end of the second charge and discharge interface are both connected to the main control module through a BMS communication simulation module; The main control module is used to control the charge and discharge conversion of the bidirectional DC converter, control the battery monitoring module and receive the status information of the energy storage battery collected by the battery monitoring module, and control the BMS communication simulation module so that it can complete the communication protocol transmission with the external V2G charging and discharging pile to be detected.

2. The portable detection device for V2G charging and discharging pile according to claim 1 is characterized in that: It also includes an AC / DC converter and an AC charging interface, wherein a first end of the AC charging interface is connected to a third end of the energy storage battery through the AC / DC converter, a second end of the AC charging interface is connected to an external mains power supply, and the AC / DC converter is also connected to a main control module, which is also used to control the AC / DC converter to perform compensation charging on the energy storage battery.

3. The movable detection device for V2G charging and discharging pile according to claim 2 is characterized in that: It also includes a communication interface and a host computer, and the main control module is connected to the host computer through the communication interface.

4. The movable detection device for V2G charging and discharging pile according to claim 3 is characterized in that: It also includes a shell, in which a main control module, an energy storage battery, a bidirectional DC converter, a BMS communication simulation module, a battery monitoring module and an AC / DC converter are all arranged, and a first charging and discharging interface, a second charging and discharging interface, an AC charging interface and a communication interface are all arranged on one side of the shell.

5. The movable detection device for V2G charging and discharging pile according to claim 4, characterized in that: It also includes a heat dissipation fan and a heat dissipation net. The heat dissipation fan is arranged in the shell, and the heat dissipation net is arranged on the side of the shell.

6. The movable detection device for V2G charging and discharging pile according to claim 4, characterized in that: A pair of handles are also included, and the handles are arranged on opposite sides of the shell.

7. The movable detection device for V2G charging and discharging pile according to claim 4, characterized in that: The utility model also comprises a plurality of universal wheels which are arranged at the bottom end of the shell body.

8. The movable detection device for V2G charging and discharging pile according to claim 1, characterized in that: The status information of the energy storage battery includes the voltage, SOC, temperature information of the entire battery and the voltage, SOC and temperature information of the single battery.

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