A high-security electric vehicle charging and discharging device

Abstract

The present invention relates to the technical field of electric vehicle charging, and specifically relates to a high-safety electric vehicle charging and discharging device, which includes a main control operation unit and a charging and discharging unit; the main control operation unit is respectively connected to a server and an electric vehicle. The main control operation unit includes a control module I, a metering module, a display module, a payment module, and a printing module. The control module I is in bidirectional communication connection with the metering module, the display module, the payment module, and the printing module. In addition to being able to charge electric vehicles, the present invention also has the function of maintaining the batteries of electric vehicles. First, the remaining power of the electric vehicle battery is discharged at a low rate through this device and fed back to the power grid, and then power is taken from the power grid through this device to charge the electric vehicle at a low rate, realizing low-rate deep charging and discharging of the electric vehicle battery, activating the battery performance, and improving the service life of the battery.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle charging, and particularly to a high - safety electric vehicle charging and discharging device. Background Art

[0002] With the establishment of the national new - energy strategy, continuous policy inclination and R & D investment, the development prospect of new - energy vehicles has become increasingly clear, effectively promoting the rapid development of electric vehicles. The environmentally - friendly and energy - saving electric vehicles are playing the role of replacing fuel vehicles, and the charging piles, as an important auxiliary product to support the operation of electric vehicles, have emerged as the times require. According to the "Guiding Opinions on Accelerating the Construction of Electric - Vehicle Charging Infrastructure", by 2020, a moderately - advanced, vehicle - pile - matching, intelligent and efficient charging infrastructure system will be basically completed to meet the charging needs of more than 5 million electric vehicles. In recent years, electric - vehicle charging piles have developed rapidly and are installed in public places such as parking lots and highway service areas.

[0003] However, the current charging piles have been focusing on solving the problem of fast charging, with the power level increasing continuously from 15kW, 30kW, 60kW to 120kW. The charging mode is to passively receive the charging instructions sent by the electric - vehicle battery management system and charge according to the instructions, lacking active judgment. When the electric - vehicle battery management system fails, over - charging may occur, damaging the battery.

[0004] Currently, the functions of charging piles are relatively single, lacking the functions of monitoring the state of electric - vehicle batteries and on - site maintenance. In addition, electric - vehicle charging piles are arranged outdoors all year round, exposed to wind and sun, and often in a high - power output working mode, posing risks such as overheating and catching fire.

[0005] Therefore, in view of the above - mentioned current situation, there is an urgent need to develop a high - safety electric - vehicle charging and discharging device to overcome the deficiencies in current practical applications. Summary of the Invention

[0006] The purpose of the present invention is to provide a high - safety electric - vehicle charging and discharging device to solve the problems raised in the above - mentioned background art.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A high - safety electric - vehicle charging and discharging device includes a main control operation unit, a charging and discharging unit, and a fire - extinguishing unit; the main control operation unit is respectively connected to a server and an electric vehicle. The main control operation unit includes a control module I, a metering module, a display module, a payment module, and a printing module. The control module I is in bidirectional communication connection with the metering module, the display module, the payment module, and the printing module.

[0009] The charge and discharge unit is connected to the main control operation unit. The charge and discharge unit includes a three-phase AC socket, a three-phase circuit breaker, a filter, a bidirectional AC-DC converter, a bidirectional DC-DC converter, a DC contactor, a charge and discharge plug, a signal detection and conditioning module, and a digital signal processor. The three-phase 380V AC power from the power grid is connected to the three-phase AC socket through the AC power interface. The three-phase AC socket is connected to the filter, and the filter is then connected to the bidirectional AC-DC converter. The bidirectional AC-DC converter is connected to the bidirectional DC-DC converter, and the bidirectional DC-DC converter is then connected to the charge and discharge plug. The charge and discharge plug is connected to the electric vehicle through the high-voltage DC power interface;

[0010] The fire extinguishing unit is connected to the main control operation unit. The fire extinguishing unit includes a control module II, a temperature sensor, a smoke sensor, a fire sensor, and a fire extinguishing device. The input end of the control module II is connected to the temperature sensor, the smoke sensor, and the fire sensor, and the output end of the control module II is connected to the fire extinguishing device.

[0011] As a further solution of the present invention: The main control operation unit is respectively connected to the server, the electric vehicle, and the charge and discharge unit through the CAN bus.

[0012] As a further solution of the present invention: The control module I is respectively connected to the metering module, the display module, the payment module, and the printing module through the RS485 bus.

[0013] As a further solution of the present invention: A three-phase circuit breaker is provided between the three-phase AC socket and the filter, and a DC contactor is provided between the bidirectional DC-DC converter and the charge and discharge tap.

[0014] As a further solution of the present invention: The signal detection and conditioning module is respectively connected to the digital signal processor, the bidirectional AC-DC converter, the bidirectional DC-DC converter, the three-phase circuit breaker, and the DC contactor.

[0015] As a further solution of the present invention: The main control operation unit is connected to the fire extinguishing unit through the CAN bus.

[0016] As a further solution of the present invention: The fire extinguishing device uses aerosol fire extinguishing agent.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. The present invention monitors the relevant signals of the battery at all times during the charging process. Under normal conditions, it charges the electric vehicle according to the charging command signal. When a fault signal such as too high battery cell voltage or too high battery temperature is detected, even if the charging command signal is received, the charging will be suspended, and the charging will be resumed after the fault is eliminated, adding an extra layer of protection and improving safety;

[0019] 2. In addition to being able to charge electric vehicles, the present invention also has the function of maintaining the batteries of electric vehicles. First, the remaining power of the electric vehicle battery is discharged at a low rate through this device and fed back to the power grid. Then, this device draws power from the power grid and charges the electric vehicle at a low rate, achieving low-rate deep charge and discharge of the electric vehicle battery, activating the battery performance, and extending the service life of the battery.

[0020] 3. In addition to the functions of charging and maintaining electric vehicles, the present invention also adds a fire extinguishing function. Electric vehicle charging piles are arranged outdoors throughout the year, exposed to wind, sun, and often in a high-power output working mode, posing risks such as overheating and catching fire. The present invention has the function of timely extinguishing fire through the sensing and detection functions of temperature, smoke, and flames, improving the use safety of the electric vehicle charging and discharging device. Brief Description of the Drawings

[0021] Figure 1 It is a structural schematic diagram of a high-safety electric vehicle charging and discharging device.

[0022] In the figure: 1 - main control operation unit, 11 - control module I, 12 - metering module, 13 - display module, 14 - payment module, 15 - printing module, 2 - charging and discharging unit, 21 - charging and discharging plug, 22 - DC contactor, 23 - bidirectional DC-DC converter, 24 - signal detection and conditioning module, 25 - three-phase AC socket, 26 - three-phase circuit breaker, 27 - filter, 28 - digital signal processor, 3 - fire extinguishing unit, 31 - control module II, 32 - smoke sensor, 33 - fire sensor, 34 - temperature sensor. Detailed Embodiments

[0023] The technical solutions of this patent will be further described in detail below in conjunction with the specific embodiments.

[0024] The embodiments of this patent will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below with reference to the drawings are exemplary and are only used to explain this patent and should not be construed as a limitation of this patent.

[0025] In the description of this patent, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this patent and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this patent.

[0026] In the description of this patent, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "linkage", and "setting" should be understood in a broad sense. For example, it can be fixedly connected and set, or detachably connected and set, or integrally connected and set. For those of ordinary skill in the art, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0027] Embodiment 1

[0028] Please refer to Figure 1 , in the embodiment of the present invention, a high-safety electric vehicle charging and discharging device includes a main control operation unit 1 and a charging and discharging unit 2; the main control operation unit 1 is respectively connected to a server and an electric vehicle. The main control operation unit 1 includes a control module I 11, a metering module 12, a display module 13, a payment module 14, and a printing module 15. The metering module 12 is used to record the charging amount of the electric vehicle, the display module 13 is used to display the charging amount, the payment module 14 is used to pay the charging fee, and the printing module 15 is used to print the charging information and fee information. The control module I 11 is respectively connected to the metering module 12, the display module 13, the payment module 14, and the printing module 15 for two-way communication, and is used for the control module I 11 to receive the feedback information of each functional module and send control instructions to each functional module;

[0029] Specifically, in this embodiment, the main control operation unit 1 is respectively connected to the server and the electric vehicle through a CAN bus to realize data interaction among the main control operation unit 1, the server, and the electric vehicle. The control module I 11 is respectively connected to the metering module 12, the display module 13, the payment module 14, and the printing module 15 through an RS485 bus, so as to realize two-way communication among the modules;

[0030] The charging and discharging unit 2 is connected to the main control operation unit 1. The charging and discharging unit 2 includes a three-phase AC socket 25, a three-phase circuit breaker 26, a filter 27, a bidirectional AC-DC converter, a bidirectional DC-DC converter 23, a DC contactor 22, a charging and discharging plug 21, a signal detection and conditioning module 24, and a digital signal processor 28. The three-phase 380V AC power of the power grid is connected to the three-phase AC socket 25 through an AC power interface. The three-phase AC socket 25 is connected to the filter 27, and the filter 27 is then connected to the bidirectional AC-DC converter. The bidirectional AC-DC converter is connected to the bidirectional DC-DC converter 23, and the bidirectional DC-DC converter 23 is then connected to the charging and discharging plug 21. The charging and discharging plug 21 is connected to the electric vehicle through a high-voltage DC power interface;

[0031] Specifically, in this embodiment, a three-phase circuit breaker 26 is provided between the three-phase AC socket 25 and the filter 27, and a DC contactor 22 is provided between the bidirectional DC-DC converter 23 and the charge and discharge tap 21;

[0032] Specifically, in this embodiment, the charge and discharge unit 2 and the main control operation unit 1 are connected through a CAN bus;

[0033] The signal detection and conditioning module 24 is respectively connected to the digital signal processor 28, the bidirectional AC-DC converter, the bidirectional DC-DC converter 23, the three-phase circuit breaker 26, and the DC contactor 22. The signal detection and conditioning module 24 detects the voltage and current signals of the bidirectional AC-DC converter and the bidirectional DC-DC converter 23, conditions them and then sends them to the digital signal processor 28. The signal detection and conditioning module 24 receives the control signals sent by the digital signal processor 28, conditions and amplifies them, and then drives and controls the on / off of the three-phase circuit breaker 26 and the DC contactor 22;

[0034] When the charge and discharge unit 2 receives the charging instruction information from the main control operation unit 1, it filters the three-phase alternating current through the filter 27, then rectifies it into direct current through the bidirectional AC-DC converter, and then performs step-up and step-down control through the bidirectional DC-DC converter 23 to provide current for charging the electric vehicle battery; when the charge and discharge unit 2 receives the maintenance instruction information from the main control operation unit 1, it controls the remaining power of the electric vehicle battery to discharge at a low rate. First, it performs step-up and step-down adjustment through the bidirectional DC-DC converter 23, then inversely converts it into three-phase alternating current through the bidirectional AC-DC converter and feeds it back to the power grid. When the electric vehicle battery reaches the deep discharge requirement, it then takes power from the power grid and controls the charging at a low rate, and charges the electric vehicle through the filter 27, the bidirectional AC-DC converter, and the bidirectional DC-DC converter 23.

[0035] Embodiment 2

[0036] Please refer to Figure 1, The difference between this embodiment and Embodiment 1 is that it further includes a fire extinguishing unit 3. The fire extinguishing unit 3 is connected to the main control operation unit 1. The fire extinguishing unit 3 includes a control module II 31, a temperature sensor 34, a smoke sensor 32, a fire sensor 33, and a fire extinguishing device 35. The input end of the control module II 31 is connected to the temperature sensor 34, the smoke sensor 32, and the fire sensor 33. The output end of the control module II 31 is connected to the fire extinguishing device 35. When the control module II 31 detects that the temperature of the charge and discharge device is too high through the temperature sensor 34, the fire extinguishing unit 3 sends a fault signal to the main control operation unit 1, and the main control operation unit 1 controls the charge and discharge unit 2 to immediately stop the charge and discharge operation and continue to execute after the fault is eliminated; when the control module II 31 detects a fire fault, the fire extinguishing unit 3 sends a fault signal to the main control operation unit 1, and the main control operation unit 1 controls the charge and discharge unit to immediately stop the charge and discharge operation, cut off the three-phase circuit breaker 26 and the DC contactor 22, and at the same time start the fire extinguishing device 35 to start extinguishing the fire;

[0037] Specifically, in this embodiment, the fire extinguishing unit 3 is connected to the main control operation unit 1 through a CAN bus;

[0038] In order to avoid polluting the internal components of the charge and discharge device after extinguishing the fire, the fire extinguishing device 35 uses an aerosol fire extinguishing agent.

[0039] The above are only the preferred embodiments of the present invention. It should be noted that for those skilled in the art, without departing from the concept of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicality of the patent.

Claims

1. A high-security electric vehicle charging and discharging device, characterized in that, It includes a main control operation unit (1), a charge and discharge unit (2), and a fire extinguishing unit (3); the main control operation unit (1) is respectively connected to a server and an electric vehicle. The main control operation unit (1) includes a control module I (11), a metering module (12), a display module (13), a payment module (14), and a printing module (15). The control module I (11) is in bidirectional communication connection with the metering module (12), the display module (13), the payment module (14), and the printing module (15) respectively; The charge and discharge unit (2) is connected to the main control operation unit (1). The charge and discharge unit (2) includes a three-phase AC socket (25), a three-phase circuit breaker (26), a filter (27), a bidirectional AC-DC converter, a bidirectional DC-DC converter (23), a DC contactor (22), a charge and discharge plug (21), a signal detection and conditioning module (24), and a digital signal processor (28). The three-phase 380V AC power from the grid is connected to the three-phase AC socket (25) through an AC power interface. The three-phase AC socket (25) is connected to the filter (27), and the filter (27) is then connected to the bidirectional AC-DC converter. The bidirectional AC-DC converter is connected to the bidirectional DC-DC converter (23), and the bidirectional DC-DC converter (23) is then connected to the charge and discharge plug (21). The charge and discharge plug (21) is connected to the electric vehicle through a high-voltage DC power interface; The fire extinguishing unit (3) is connected to the main control operation unit (1). The fire extinguishing unit (3) includes a control module II (31), a temperature sensor (34), a smoke sensor (32), a fire sensor (33), and a fire extinguishing device (35). The input end of the control module II (31) is connected to the temperature sensor (34), the smoke sensor (32), and the fire sensor (33), and the output end of the control module II (31) is connected to the fire extinguishing device (35); A three-phase circuit breaker (26) is provided between the three-phase AC socket (25) and the filter (27), and a DC contactor (22) is provided between the bidirectional DC-DC converter (23) and the charge and discharge plug (21); The signal detection and conditioning module (24) is respectively connected to the digital signal processor (28), the bidirectional AC-DC converter, the bidirectional DC-DC converter (23), the three-phase circuit breaker (26), and the DC contactor (22); The fire extinguishing device (35) uses aerosol fire extinguishing agent; The signal detection and conditioning module (24) detects the voltage and current signals of the bidirectional AC-DC converter and the bidirectional DC-DC converter (23), conditions them and then sends them to the digital signal processor (28). The signal detection and conditioning module (24) receives the control signals sent by the digital signal processor (28), conditions and amplifies them, and then drives the on-off of the three-phase circuit breaker (26) and the DC contactor (22); When the charge and discharge unit (2) receives the charging instruction information from the main control operation unit (1), it filters the three-phase alternating current through the filter (27), then rectifies it into direct current through the bidirectional AC-DC converter, and then performs step-up and step-down control through the bidirectional DC-DC converter (23) to provide current for charging the electric vehicle battery; when the charge and discharge unit (2) receives the maintenance instruction information from the main control operation unit (1), it controls the remaining power of the electric vehicle battery to discharge at a low rate. First, it performs step-up and step-down adjustment through the bidirectional DC-DC converter (23), then inversely converts it into three-phase alternating current through the bidirectional AC-DC converter and feeds it back to the power grid. When the electric vehicle battery meets the deep discharge requirement, it then takes power from the power grid and charges the electric vehicle at a low rate through the filter (27), bidirectional AC-DC converter, and bidirectional DC-DC converter (23).

2. The high-security electric vehicle charging and discharging device according to claim 1, characterized in that, The main control operation unit (1) is respectively connected to the server, electric vehicle, and charge and discharge unit (2) through the CAN bus.

3. The high-security electric vehicle charging and discharging device according to claim 2, wherein The control module I (11) is respectively connected to the metering module (12), display module (13), payment module (14), and printing module (15) through the RS485 bus.

4. The high-security electric vehicle charging and discharging device according to claim 1, characterized in that, The main control operation unit (1) is connected to the fire extinguishing unit (3) through the CAN bus.

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