A kind of AC / DC electric vehicle charging pile and the metering system of charger

Abstract

The application discloses an alternating-current and direct-current electric vehicle charging pile and a metering system of a charging machine, and belongs to the technical field of electric vehicles. The metering system of the alternating-current and direct-current electric vehicle charging pile and the charging machine comprises an electric vehicle charging pile, the electric vehicle charging pile is sequentially electrically connected with a charging pile verifier and a battery load, the battery load is electrically connected with an inverter, and the inverter is electrically connected with a power grid. The technical scheme provides the metering system of the alternating-current and direct-current electric vehicle charging pile and the charging machine.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric vehicles, in particular to a metering system of AC / DC electric vehicle charging piles and charging machines. BACKGROUND

[0002] In order to better support the promotion of new energy vehicles, the construction of supporting infrastructure such as charging piles and battery swap stations has also followed.

[0003] With the development of mandatory verification of electric vehicle charging piles, we found a serious problem in the process of measurement and verification, that is, the waste of electric energy in the verification process. In the verification process, the existing load converts electric energy into heat energy and consumes it, causing waste of resources. For example, according to the requirements of the verification regulation, the charging machine (pile) with accuracy level 1 needs to consume at least 10kwh of electric energy for each gun verification, and the charging machine (pile) with accuracy level 2 needs to consume at least 5kwh of electric energy for each gun verification. The consumed electric energy cannot actually affect people's production and life, resulting in waste of these electric energy.

[0004] At the same time, the existing load is composed of resistive materials, which is large in size and not convenient to carry, and its internal structure is precise. During the measurement and verification process, it needs to be carried back and forth and pushed, which is easy to cause open circuit failure and other faults. During the measurement and verification, the voltage and current passing through are very large, which is very easy to cause leakage and other safety hazards. The performance of the load will gradually decrease after being used for many times, and it needs to be cooled during the heating process, so it cannot be fully enclosed. When in bad weather, it cannot go out to carry out measurement and verification work. At the same time, in some cases, an external power supply is needed, but most of the charging stations cannot find 220V power sockets near them, which is not conducive to on-site operation.

[0005] Therefore, it is necessary to design a metering system of AC / DC electric vehicle charging piles and charging machines. SUMMARY

[0006] The purpose of the present application is to provide a metering system of AC / DC electric vehicle charging piles and charging machines to solve the problems raised in the background.

[0007] In order to achieve the above purpose, the present application provides the following technical scheme:

[0008] A metering system of AC / DC electric vehicle charging piles and charging machines, comprising an electric vehicle charging pile, the electric vehicle charging pile is sequentially connected with a charging pile verifier, a battery load and an inverter, the battery load is connected with the inverter, and the inverter is connected with a power grid.

[0009] The technical scheme collects the electric energy generated in the detection by adding the battery load, and the battery load can transmit the electric energy back to the power grid through the inverter.

[0010] As a further scheme of the present application: the electric vehicle charging pile and the charging pile verifier are electrically connected through the charging gun head.

[0011] The technical scheme describes in detail the connection mode of the charging pile and the charging pile verifier.

[0012] As a further scheme of the present application: the battery load includes battery load one and battery load two, the battery load one is electrically connected with the battery load two, the battery load one is electrically connected with the charging pile verifier, and the battery load one and the battery load two are electrically connected with the inverter.

[0013] The technical scheme provides two battery loads, and the energy storage function of the battery load is increased.

[0014] As a further scheme of the present application: the inverter is electrically connected with the power grid in a grid-connected mode.

[0015] The technical scheme describes in detail the connection mode of the inverter and the power grid.

[0016] In summary, the beneficial effects of the present application are: by setting the battery load, the waste of electric energy is reduced, and the electric energy is stored, and at the same time, the inverter is connected with the power grid, and the stored electric energy can be transmitted back to the power grid; at the same time, the volume and weight of the battery load are smaller than those of the existing load, which is convenient for carrying, and the internal structure of the battery load is simpler than that of the existing load, and the probability of failure is small; and the battery load structure is simple and convenient to replace, and at the same time, it can be fully enclosed and used in bad weather. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a charging structure diagram of a metering system of an alternating current and direct current electric vehicle charging pile and a charger;

[0018] Figure 2 It is a discharging structure diagram of a metering system of an alternating current and direct current electric vehicle charging pile and a charger.

[0019] In the figure: 1, electric vehicle charger; 2, charging gun head; 3, charging pile verifier; 4, battery load one; 5, battery load two; 6, inverter; 7, grid connection; 8, power grid. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0021] Embodiment

[0022] Please refer to Figures 1-2 As Figure 1 shown, a kind of AC and DC electric vehicle charging pile and the metering system of charger includes electric vehicle charging pile 1, preferably, the electric vehicle charging pile 1 can also be replaced by electric vehicle charger, the electric vehicle charging pile 1 is connected with charging pile calibrator 3, battery load in turn, the electric vehicle charging pile 1 is connected with charging pile calibrator 3 by charging gun head 2, the battery load includes battery load one 4 and battery load two 5, the battery load one is connected with battery load two, the battery load one 4 is connected with charging pile calibrator 3, when quantitative verification starts, the current exported from electric vehicle charging pile 1 or electric vehicle charger is passed through charging pile calibrator 3, according to JJG1148 and JJG1149 regulation requirement, the power size of the charger (pile) of the detected, average every gun detection time is about 20 minutes, the number of guns detected each day is 20, charging consumption electric energy is calculated according to 10kWh, so the electric energy that needs to be stored is about 200kWh, therefore can be designed as two battery loads, including battery load one 4 and battery load two 5, the electric capacity of two battery loads can be set to 100kWh, rated voltage 500V, rated current 120A, preferably, two battery loads are all used 18650 battery, single 18650 battery voltage is 3.5V, current is 2500mA, input end uses electric vehicle non-vehicle-mounted charger and electric vehicle charging pile standard interface, matches BMS battery management system, connects battery pack charging protocol with charging pile calibrator protocol, so the design of front segment storage electric energy is completed.

[0023] As Figure 2As shown, the battery load one 4 and the battery load two 5 are electrically connected with the inverter 6, the inverter voltage output is 220V, the inverter 6 has the functions of voltage stabilization, current stabilization, filtering and the like, and guarantees the purity of the output power, the inverter 6 is electrically connected with the power grid 8 in the manner of grid connection 7, and the grid connection 7 working mode is divided into Load first, Batt first, Grid first and anti-inrush mode, Load first controls the discharge power of the battery by detecting the power on the grid connection side, the purpose is to improve the self-generation and self-use rate and reduce the power exchange with the power grid, and the Load first also has the function of peak clipping and valley filling, the Grid first can be set in a time period, and the battery discharges to the power grid in the time period, the anti-inrush mode is a special mode, which can be used in combination with the Load first and the Batt first, but when the Grid first+anti-inrush mode, the Grid first setting is invalid, when the quantitative detection is completed, the appropriate inverter power is selected, and it is guaranteed that the battery load power can be fully released, and the next day's metering detection is not affected, and the safety and stability of the power grid are guaranteed in the inverter process, in the whole charging and discharging process, the PV input reverse connection protection, the battery input reverse connection protection, the direct current input switch (PV), the direct current surge protection (PV), the output surge protection, the output short circuit protection can be set to protect the circuit, at the same time, the insulation impedance detection is set to detect the insulation of the whole facility, the grounding fault monitoring is set to detect the grounding function, the residual current detection is set to improve the safety of the device, the power grid monitoring and the island detection are set to detect the state of the power grid, so that the power grid is not disturbed, and there is no influence of excessive harmonic components and the like.

[0024] It should be noted that the above embodiments are only for specifically and clearly describing the technical solutions and technical features of the present application. For those skilled in the art, the solutions or features belonging to the prior art or common knowledge are not described in detail in the above embodiments.

[0025] In addition, the technical solutions of the present application are not limited to the above embodiments, and those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined, so as to form other implementation manners which can be understood by those skilled in the art.

Claims

1. An AC / DC electric vehicle charging pile and charging machine metering system, characterized in that, Including electric vehicle charging pile (1), the electric vehicle charging pile (1) is connected with charging pile verifier (3), battery load and inverter (6) in turn, the battery load is connected with the grid (8); The electric vehicle charging pile (1) is connected with charging pile verifier (3) through charging gun head (2); The battery load includes battery load one (4) and battery load two (5), the battery load one (4) is connected with battery load two (5), the battery load one (4) is connected with charging pile verifier (3), the battery load one (4) and battery load two (5) are connected with inverter (6);The rated capacity of two battery loads is 100kWh, the rated voltage is 500V, the rated current is 120A;And 18650 type battery is adopted, the nominal voltage of single battery is 3.5V, the discharge current is 2500mA, its input end is configured with the interface in accordance with electric vehicle non-vehicle charger and charging pile standard, the matching docking of battery pack charging protocol and charging pile verifier protocol is realized through BMS battery management system; The inverter (6) is connected with the grid (8) in the form of grid (7);Grid (7) working mode includes Loadfirst, Batt first, Grid first, anti-backflow, wherein, Grid first can set time period, combined with Loadfirst, Batt first, when Grid first is combined with anti-backflow, Grid first setting is invalid; In the process of charging and discharging, set PV input reverse connection protection, battery input reverse connection protection, PV DC input switch, PV DC inrush protection, output inrush protection and output short circuit protection;Integrating detection insulation impedance detection of overall facility insulation, ground fault monitoring of detecting grounding function, residual current detection of improving device safety, and grid monitoring and island detection of detecting grid state.

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