Intelligent charging pile for electric vehicle

Abstract

The present invention relates to the field of charging pile technology, and in particular to an intelligent charging pile for electric vehicles. The charging pile of the present invention has a built-in high-power charger module, and the charging speed is fast, and there is no need to worry about the charger being stolen, not fully charged, charging crowded and other problems. Moreover, the charger has a high power factor and little pollution to the power grid; it has high efficiency and saves energy and reduces emissions; the built-in MCU detects various problems that endanger charging safety in real time and determines charging safety; the safety standards are unified and can quickly match the national charging-related safety standards. At the same time, the charging data is uploaded to the server, and strong evidence support is provided for finding the cause of the accident after the charging accident occurs. The present invention is provided with a data verification unit, which can quickly determine whether the charging operation of the charging pile meets the standard based on the difference between the acquired charging power and the preset charging power benchmark, thereby improving the efficiency of the charging operation of the charging pile.

Description

Technical Field

[0001] The present invention relates to the technical field of charging piles, and in particular to an intelligent charging pile for electric vehicles. Background Art

[0002] The user of the charging pile scans the QR code on the socket. After receiving the charging time, the charging pile turns on the power of the corresponding socket and uses the energy metering chip to count the charger power to determine the charging standard. The AC charging pile only provides 220V AC power, and users need to bring their own chargers to charge electric bicycles. Charging safety depends entirely on the user's charger, which causes many charging fire accidents. The charging current is small, resulting in long charging time, insufficient charging, and crowded charging. The quality of the chargers brought by users is uneven and does not meet safety standards. It is easy to cause safety accidents such as charging fire and electric shock; because the charger is external, it is easy to be stolen. The charger can only charge one battery pack, has poor compatibility and no charging protection function. The charging power factor is low, which is harmful to the power grid. Solving the problems of charging efficiency and accuracy of charging piles is becoming more and more important.

[0003] Chinese patent publication number CN: 108909503B discloses an intelligent charging pile, including a pile body, a microprocessor, a battery, a cable, an automatic cord reel, a charging plug assembly, and a distance detection sensor for detecting the distance of a vehicle to be charged, wherein the battery, the microprocessor, and the automatic cord reel are all arranged in the pile body, and the distance detection sensor is arranged on the pile body; the battery is connected to the charging plug assembly through the cable, the cable is wound on the automatic cord reel, and the microprocessor is respectively connected to the battery, the automatic cord reel, and the distance detection sensor. However, the invention does not mention how to solve the problem of intelligent charging efficiency and accuracy of the charging pile. Summary of the invention

[0004] To this end, the present invention provides an intelligent charging pile for electric vehicles, so as to overcome the problem of low operating efficiency of charging piles for new energy electric vehicles in the prior art.

[0005] To achieve the above object, the present invention provides a smart charging pile for electric vehicles, comprising:

[0006] A charging pile control unit, used to match the charging current and charging power according to the connected electric vehicle;

[0007] An analysis and detection unit, which is connected to the charging pile control unit and is used to detect charging parameters, including charging current, charging power, charging time and charger temperature;

[0008] A data verification unit is connected to the analysis and detection unit and is used to determine whether the charging operation of the charging pile meets the standards based on the acquired charging current when it is preliminarily determined that the charging operation of the charging pile does not meet the standards, or, when it is determined that the charging operation of the charging pile does not meet the standards, determine the reason why the charging operation of the charging pile does not meet the standards based on the difference between the acquired charging time and a preset charging time benchmark.

[0009] Furthermore, the data verification unit is also used to determine the charging operation state of the charging pile according to the difference between the acquired charging power and a preset charging power reference, including:

[0010] When it is preliminarily determined that the charging operation of the charging pile does not meet the standards, a secondary determination is made as to whether the charging operation of the charging pile meets the standards based on the acquired charging current; or, when it is determined that the charging operation of the charging pile does not meet the standards, the reason why the charging pile operation does not meet the standards is determined based on the difference between the acquired charging time and the preset charging time benchmark.

[0011] Furthermore, the charging pile of the charging pile control unit unit includes:

[0012] An AC input port module, which is used to output charging current through an AC power line for charging;

[0013] A charger module, comprising a charger module 1, a charger module 2 and a charger module 3, connected to the AC input port and used to control system charging;

[0014] A 4G control module, which is connected to the AC input port and the charger module respectively, and is used for forwarding data information;

[0015] The charging port module is respectively connected to the charger module 1, the charger module 2 and the charger module 3, and is used for outputting power.

[0016] Furthermore, the data verification unit is also used to determine the reason why the charging operation of the charging pile does not meet the standard based on the difference between the acquired charging time and the preset charging time benchmark when it is determined for the second time that the charging operation of the smart charging pile does not meet the standard.

[0017] Furthermore, the data verification unit is also used to match a corresponding processing method based on the determined reason why the charging operation of the charging pile does not meet the standard, including:

[0018] Determine that the reason is that the order is terminated when the user actively terminates charging or the charging connector is unplugged;

[0019] Determining that the reason is that the charging time benchmark is re-determined based on the acquired charging current when the battery of the electric vehicle is fully charged;

[0020] When it is determined that the cause is that the contact between the charging interface of the charging pile and the electric vehicle does not meet the standard, the charging port of the charger is re-determined based on the acquired charging current.

[0021] Furthermore, the data verification unit is used to provide a plurality of correction methods for the charging time reference based on the difference between the acquired charging current and the preset current reference, and the correction range of each correction method for the charging time reference is different.

[0022] Furthermore, the data verification unit is used to provide a plurality of replacement methods for the charging port of the charger based on the acquired charging temperature.

[0023] Furthermore, the data verification unit is used to transmit the electrical operation parameters of the charging pile that meets the standards to the server side so that the server side backs up the electrical operation parameters.

[0024] Furthermore, the charger module of the charging pile includes a lightning protection circuit and an EMI filter of the charger circuit.

[0025] Furthermore, the lightning protection circuit of the charger circuit includes a varistor and an air discharge tube, which is used to clamp the voltage between L and N within a selected range after the voltage of the L line and the N line exceeds the trigger voltage of the varistor RV2; RV1, RV3 and G1 discharge surge energy to the ground.

[0026] Compared with the prior art, the beneficial effect of the present invention is that the present invention can quickly determine whether the charging operation of the charging pile meets the standard based on the difference between the acquired charging power and the preset charging power benchmark by providing a data verification unit, thereby improving the efficiency of the charging operation of the charging pile, and secondarily determine whether the charging operation of the charging pile meets the standard by obtaining the charging current, thereby improving the accuracy of the charging operation of the charging pile. The difference between the acquired charging time and the preset charging time benchmark can quickly determine the reason why the charging operation of the charging pile does not meet the standard, thereby saving the time for finding the reason and improving the efficiency of the charging operation of the charging pile.

[0027] Furthermore, the charging pile has a built-in high-power charger module with a fast charging speed. There is no need to worry about the charger being stolen, not fully charging, or charging congestion.

[0028] Furthermore, the charger has a high power factor and less pollution to the power grid; it is highly efficient and saves energy and reduces emissions; its built-in MCU detects various issues that endanger charging safety in real time and determines charging safety; its safety standards are unified and can quickly match the national charging-related safety standards.

[0029] Furthermore, the charging data is uploaded to the server, providing strong evidence support for finding the cause of the accident after a charging accident occurs. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a structural block diagram of the intelligent charging pile for electric vehicles according to the present invention;

[0031] Figure 2 A flow chart for determining whether the operation of the charging pile of the present invention meets the standards;

[0032] Figure 3 This is a structural block diagram of the charging pile system of the present invention;

[0033] Figure 4 It is a structural block diagram of the internal charging system of the present invention;

[0034] Figure 5 This is a structural block diagram of the charger module described in the present invention. DETAILED DESCRIPTION

[0035] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0036] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0037] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0038] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] See also Figure 1 As shown, it is a structural block diagram of the intelligent charging pile of the electric vehicle of the present invention. The intelligent charging pile of the electric vehicle of the present invention includes:

[0040] A charging pile control unit, which includes an electric vehicle, a charging pile, an IoT platform and a user-side APP, is used to match charging current and charging power parameter data for charging;

[0041] An analysis and detection unit, which is connected to the charging pile control unit and is used to detect charging parameters, including: charging current, charging power, charging time and charger temperature parameter data;

[0042] A data verification unit is connected to the analysis and detection unit and is used to determine whether the charging operation of the charging pile meets the standards based on the obtained charging current when it is preliminarily determined that the charging operation of the charging pile does not meet the standards based on the obtained charging power; and, when it is determined that the charging operation of the charging pile does not meet the standards, determine the reason why the charging operation of the charging pile does not meet the standards based on the difference between the obtained charging time and a preset charging time benchmark.

[0043] See also Figure 2 As shown, it is a flow chart for determining whether the operation of the charging pile of the present invention meets the standard; the data verification unit of the present invention is used to determine whether the charging operation of the charging pile meets the standard based on the difference between the acquired charging power and the preset charging power reference, including:

[0044] If the difference is less than or equal to a preset first benchmark, the data verification unit determines that the charging operation of the charging pile meets the standard, and the charger starts charging;

[0045] If the difference is greater than a preset first reference and less than or equal to a preset second reference, the data verification unit preliminarily determines that the charging operation of the charging pile does not meet the standard, and secondarily determines whether the charging operation of the charging pile meets the standard based on the acquired charging current;

[0046] If the difference is greater than a preset second benchmark, the data verification unit determines that the charging operation of the charging pile does not meet the standard, and determines the reason why the charging pile operation does not meet the standard based on the difference between the acquired charging time and the preset charging time benchmark.

[0047] See also Figure 3 and Figure 4 As shown, its Figure 3 This is a structural diagram of the charging pile system of the present invention. Figure 4 This is a structural block diagram of the charging system of the present invention. The operation steps of the charging pile control unit of the present invention include:

[0048] Step S1, when the charging pile is powered on, the 4G module automatically connects to the network, and after the connection is successful, the 4G control board starts to connect to the server;

[0049] Step S2, after scanning the QR code to obtain the charging pile device number through the user-side APP or mini program, query the charging port status and enter the charging parameter selection interface;

[0050] Step S3, select the charging parameters that match the electric vehicle under the idle port selection, click to start charging, the charging parameters are sent to the server, and the user-side APP or applet enters the charging interface;

[0051] Step S4, according to the start charging command sent by the server to the charging pile, the 4G control board interprets and sends the charging parameters to the charger;

[0052] Step S5, the charger starts a self-check according to the battery pack matching parameters detected by the charger;

[0053] Step S6, the charger starts charging after the working conditions are met, and records the charging parameters.

[0054] Preferably, the charger starts self-checking in step S5 including AC input voltage, PFC output voltage, and temperature. After all working conditions are met, the charger starts charging and returns parameters such as charging voltage, charging current, power, charging time, and charger status. If one of the conditions is not met, the corresponding charger status code is returned.

[0055] The 4G control board processes the information returned by the charger and sends it to the server. After receiving the information, the server determines whether the charging status code is 1. If it is 1, an order is established and the charging parameters are forwarded to the user's applet or APP. If it is not 1, the order is ended and the charging end information is sent to the user's applet or APP.

[0056] After receiving the charging parameters, the mini program or APP will display them on the charging interface; if the charging end message is received, the charging interface will be exited.

[0057] If charging is terminated due to various reasons, including the charging time is up, the user actively terminates charging, the battery is fully charged, the charging connector is unplugged, the charging interface has poor contact, etc., the server settles the charging fee and returns the remaining amount to the user. This completes a charging process.

[0058] Specifically, Figure 4 The charging pile of the charging pile control unit unit includes:

[0059] An AC input port module, which is used to output charging current through an AC power line for charging;

[0060] A charger module, comprising a charger module 1, a charger module 2 and a charger module 3, connected to the AC input port and used to control system charging;

[0061] A 4G control module, which is connected to the AC input port and the charger module respectively, and is used for forwarding data information;

[0062] The charging port module is respectively connected to the charger module 1, the charger module 2 and the charger module 3, and is used for outputting power.

[0063] Please continue reading Figure 5 As shown, it is a structural block diagram of the charger module of the present invention, the charger circuit of the present invention, wherein:

[0064] The lightning protection circuit is composed of a varistor and an air discharge tube. When the voltage between the L line and the N line exceeds the trigger voltage of the varistor RV2, the voltage between L and N is clamped within the selected range; RV1, RV3 and G1 discharge surge energy to the ground; the fuse is used for short-circuit protection of the subsequent circuit.

[0065] EMI filter, CY3, CY4 and L7 attenuate radiated interference, CY3, CY4 and L5 attenuate conducted interference, R31 and R38 are used to discharge the safety capacitor after power failure.

[0066] Figure 5 The startup surge current suppression circuit in the PFC output electrolytic capacitor voltage is 0V at the moment of power-on. If the AC voltage is at its peak at this time, the charging current of the PFC output electrolytic capacitor is extremely large. By connecting power thermistors TR1 and TR2 in series in the circuit, the charging current of the PFC output electrolytic capacitor at the startup moment is reduced; after the circuit is stable, the relay is opened to improve the circuit efficiency.

[0067] Figure 5 The active PFC stage in the MOSFET adopts boost topology, with a rated output voltage of 400V and operates in CCM mode, with a power factor exceeding 98% at full load.

[0068] Figure 5 The primary MCU controls the relay, PFC chip power supply, LLC chip power supply, cooling fan power, adjusts the PFC output voltage, samples the AC input voltage, AC input current, PFC output voltage, and heat sink temperature, and the serial port communicates with the secondary MCU through a digital isolator.

[0069] Figure 5 The LLC half-bridge in the circuit efficiently transfers power from the primary to the secondary.

[0070] Figure 5 The secondary MCU in the 4G control board communicates with the 4G control board to upload charging related parameters; control the charger's cut-off charging voltage, charging current, and matching of battery pack and charging parameters; charging safety detection, such as battery pack access detection, battery pack polarity detection, battery pack voltage detection, charging current detection, full charge detection, charging interface contact point reliability detection, battery pack fault detection, temperature detection, etc.;

[0071] Figure 5The auxiliary power supply in the circuit is a 12W flyback power supply, which supplies power to the primary and secondary control systems.

[0072] The 4G control board control steps of the present invention include:

[0073] Step S101, powering the MCU and 4G module based on the AC-DC power supply output of 5V 2A;

[0074] Step S102, forwarding data based on the parameters obtained by the 4G module;

[0075] Step S103: Coordinate and process data from the server and the charger based on the MCU.

[0076] Specifically, the data verification unit of the present invention is used to determine whether the charging operation of the smart charging pile meets the standard based on the difference between the acquired charging current and the preset charging current reference, including:

[0077] If the difference is less than or equal to a preset benchmark, the data verification unit determines that the charging operation of the smart charging pile meets the standard, and the charger starts charging;

[0078] If the difference is greater than a preset benchmark, the data verification unit determines that the charging operation of the smart charging pile does not meet the standard, and determines the reason why the charging operation of the charging pile does not meet the standard based on the difference between the acquired charging time and the preset charging time benchmark.

[0079] Specifically, the data verification unit of the present invention is used to determine the reason why the charging operation of the charging pile does not meet the standard based on the difference between the acquired charging time and the preset charging time benchmark, including:

[0080] If the difference is less than or equal to a preset first benchmark, the data verification unit determines that the reason why the charging operation of the charging pile does not meet the standard is that the user actively terminates the charging and the charging connector is unplugged, and continues monitoring;

[0081] If the difference is greater than a preset first benchmark and less than or equal to a preset second benchmark, the data verification unit determines that the reason why the charging operation of the charging pile does not meet the standard is that the battery is full, and redetermines the charging time benchmark based on the acquired charging current;

[0082] If the difference is greater than a preset second benchmark, the data verification unit determines that the reason why the charging operation of the charging pile does not meet the standard is that the charging interface has poor contact, and redetermines the charger charging port based on the acquired charging current.

[0083] Specifically, the data verification unit of the present invention is used to set a number of correction methods for the charging time reference based on the difference between the acquired charging current and the preset current reference, wherein:

[0084] If the difference is less than or equal to a preset first difference reference, the data verification unit uses a first correction coefficient α1 to correct the charging time reference button to a corresponding value;

[0085] If the difference is greater than a preset first difference reference and less than or equal to a preset second difference reference, the data verification unit uses a second correction coefficient α2 to correct the charging time reference button to a corresponding value;

[0086] If the difference is greater than a preset second difference reference, the data verification unit uses a third correction coefficient α3 to correct the charging time button to a corresponding value;

[0087] Among them, the correction formula adopted by the present invention is K=k×αn, wherein k is the preset charging time benchmark before correction, K is the corrected charging time benchmark, n is a positive integer, and αn is a preset correction coefficient. The present invention sets α1=0.98; α2=0.96; α3=0.94.

[0088] Specifically, the data verification unit of the present invention is used to provide several replacement methods for the charging port of the charger based on the acquired charging temperature, including:

[0089] If the temperature is less than or equal to a preset first reference, the data verification unit uses a first replacement coefficient μ1 to replace the charging port button of the charger to a corresponding value;

[0090] If the temperature is greater than a preset first reference and less than or equal to a preset second reference, the data verification unit uses a second replacement coefficient μ2 to replace the charging port button of the charger to a corresponding value;

[0091] If the temperature is greater than a preset second reference, the data verification unit uses a third replacement coefficient μ3 to replace the charging port button of the charger to a corresponding value;

[0092] Among them, the first reference temperature preset in the present invention is set to 40°C; the preset second reference temperature is set to 60°C, and the replacement formula adopted in the present invention is, G=g×μn, wherein, g is the preset charger charging port before replacement, G is the charger charging port after replacement, n is a positive integer, μn is a preset replacement coefficient, and the present invention sets, μ1=2; μ2=3; μ3=4.

[0093] Preferably, the charger of the present invention is optimized from 3 AC-DC to 1 AC-DC and 3 DC-DC, and each charger is added with a battery internal resistance detection function, a communication port function, and a national standard charging connector.

[0094] Specifically, the data verification unit of the present invention is used to store charging operation parameters of charging piles that meet the standards to a cloud data terminal for backup.

[0095] Preferably, the data verification unit of the present invention is used to increase video and voice playback functions, and preferably, is used to enhance data storage capabilities and increase electronic lock functions for easy maintenance.

[0096] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0097] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An intelligent charging pile for electric vehicles, characterized in that: include: A charging pile control unit, used to match the charging current and charging power according to the connected electric vehicle; An analysis and detection unit, which is connected to the charging pile control unit and is used to detect charging parameters, including charging current, charging power, charging time and charger temperature; a data verification unit connected to the analysis and detection unit, and configured to determine whether the charging operation of the charging pile meets the standard based on the acquired charging current when the charging operation of the charging pile is initially determined to be not in compliance with the standard, or, when the charging operation of the charging pile is determined to be not in compliance with the standard, determine the reason why the charging operation of the charging pile does not meet the standard based on the difference between the acquired charging time and a preset charging time benchmark; The data verification unit is used to determine whether the charging operation of the charging pile meets the standard based on the difference between the acquired charging power and the preset charging power reference, including: If the difference is less than or equal to a preset first benchmark, the data verification unit determines that the charging operation of the charging pile meets the standard, and the charger starts charging; If the difference is greater than a preset first reference and less than or equal to a preset second reference, the data verification unit preliminarily determines that the charging operation of the charging pile does not meet the standard, and secondarily determines whether the charging operation of the charging pile meets the standard based on the acquired charging current; If the difference is greater than a preset second benchmark, the data verification unit determines that the charging operation of the charging pile does not meet the standard, and determines the reason why the charging pile operation does not meet the standard based on the difference between the acquired charging time and the preset charging time benchmark; If the difference is less than or equal to a preset first benchmark, the data verification unit determines that the reason why the charging operation of the charging pile does not meet the standard is that the user actively terminates the charging and the charging connector is unplugged, and continues monitoring; If the difference is greater than a preset first benchmark and less than or equal to a preset second benchmark, the data verification unit determines that the reason why the charging operation of the charging pile does not meet the standard is that the battery is full, and redetermines the charging time benchmark based on the acquired charging current; If the difference is greater than a preset second benchmark, the data verification unit determines that the reason why the charging operation of the charging pile does not meet the standard is poor contact of the charging interface, and redetermines the charger charging port based on the acquired charging current; and then corrects the charging time benchmark or the charging port.

2. The intelligent charging pile for electric vehicles according to claim 1, characterized in that: The charging pile of the charging pile control unit includes: An AC input port module, which is used to output charging current through an AC power line for charging; A charger module, comprising a charger module 1, a charger module 2 and a charger module 3, connected to the AC input port and used to control system charging; A 4G control module, which is connected to the AC input port and the charger module respectively, and is used for forwarding data information; The charging port module is respectively connected to the charger module 1, the charger module 2 and the charger module 3, and is used for outputting power.

3. The intelligent charging pile for electric vehicles according to claim 2, characterized in that: The data verification unit is also used to determine the reason why the charging operation of the charging pile does not meet the standard based on the difference between the acquired charging time and the preset charging time benchmark when it is determined for the second time that the charging operation of the smart charging pile does not meet the standard.

4. The intelligent charging pile for electric vehicles according to claim 3, characterized in that: The data verification unit is further used to match a corresponding processing method based on the determined reason why the charging operation of the charging pile does not meet the standard, including: Determine that the reason is that the order is terminated when the user actively terminates charging or the charging connector is unplugged; Determining that the reason is that the charging time benchmark is re-determined based on the acquired charging current when the battery of the electric vehicle is fully charged; When it is determined that the cause is that the contact between the charging interface of the charging pile and the electric vehicle does not meet the standard, the charging port of the charger is re-determined based on the acquired charging current.

5. The intelligent charging pile for electric vehicles according to claim 4, characterized in that: The data verification unit is used to set a plurality of correction methods for the charging time reference based on the difference between the acquired charging current and the preset current reference, and the correction range of each correction method for the charging time reference is different.

6. The intelligent charging pile for electric vehicles according to claim 5, characterized in that: The data verification unit is used to set a plurality of replacement modes for the charging port of the charger based on the acquired charging temperature.

7. The intelligent charging pile for electric vehicles according to claim 6, characterized in that: The data verification unit is used to transmit the electrical operation parameters of the charging pile that meets the standards to the server side so that the server side can back up the electrical operation parameters.

8. The intelligent charging pile for electric vehicles according to claim 7, characterized in that: The charger module of the charging pile includes a lightning protection circuit and an EMI filter of the charger circuit.

9. The intelligent charging pile for electric vehicles according to claim 8, characterized in that: The lightning protection circuit of the charger circuit includes a varistor and an air discharge tube, which is used to clamp the voltage between L and N within a selected range after the voltage of the L line and the N line exceeds the trigger voltage of the varistor RV2; RV1, RV3 and G1 discharge surge energy to the ground.

Images