Electric vehicle charging early warning out-of-control protection device and protection method

Abstract

The invention discloses an electric automobile charging early warning out-of-control protection device and method. The device comprises a charging control box arranged on a charging loop between a charging pile and an automobile charging port. The control box body is provided with indicating lamps in three colors so as to indicate the corresponding state of thermal runaway. The control box obtains the charging electric quantity of the electric vehicle in the rapid charging process, the temperature sequence of each battery module under the dynamic power and the SOC of the battery in real time, and obtains parameters such as the output power, the temperature and the charging interface temperature of the charging pile in the rapid charging process in real time. And the lightening states of the three color indicating lamps are controlled according to the parameters obtained through monitoring. The device has the advantages that the states of the electric vehicle and the charging pile in the charging process can be monitored, an alarm can be given to remind an operator when abnormity occurs, the device can also isolate the linkage effect on other equipment when the electric vehicle or the charging pile spontaneously combusts, and the problems proposed in the background technology are intelligently solved.

Description

Technical Field

[0001] The present invention relates to the field of electric vehicle charging safety monitoring, and in particular to a method and a device for early warning out-of-control protection during charging. Background Art

[0002] As the market share of electric vehicles increases, people's demand for electric vehicle charging is also increasing. During the charging process, due to internal short circuit, external short circuit, overcharging, over-discharging and other reasons, a large amount of heat is generated, resulting in thermal runaway of the battery, and accidents causing electric vehicle explosions also occur frequently. Therefore, the safety of electric vehicles and charging piles during the charging process has attracted great attention from all walks of life.

[0003] At present, the national standard charging process includes: physical connection, low-voltage auxiliary power-on, charging handshake stage, charging parameter configuration stage, charging stage and charging end stage. In the charging stage, the vehicle sends a battery charging demand message to the pile end according to the BMS requirements. The pile end will adjust the charging voltage, current and other requirements in real time according to the message parameters to ensure the normal charging process. At the same time, the two will continue to send real-time charging status information to each other, such as charging voltage, charging current, battery power, time used, equipment temperature and other parameters to monitor and control each other. In addition to the signal interaction between the vehicle and the pile, charging is stopped when a fault is detected, and there are no other out-of-control protection measures in the entire charging process;

[0004] When the circuit is short-circuited or the battery temperature exceeds the temperature limit, the electric vehicle will immediately catch fire. Before the charging pile issues a command, there is a high possibility that the entire power grid will be paralyzed from the vehicle end to the charging pile end, and the resulting loss of the charging pile and power grid circuit is immeasurable; or due to problems with the charging pile itself, it will overheat during a long period of high-power charging and cause a fire, which will affect the electric vehicle being charged and cause greater losses. Moreover, if thermal runaway occurs and the charging gun and the car are still connected or even without power failure, it will also pose a safety risk to rescue and even increase the loss of the entire charging station. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide an electric vehicle charging early warning out-of-control protection device and protection method, which can monitor the status of the electric vehicle and the charging pile during the charging process, and will issue an alarm to remind the operator when an abnormality occurs. This device can also isolate the chain effect of the electric vehicle or the charging pile on other equipment when it spontaneously ignites, and intelligently solve the problems raised in the background technology.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: an electric vehicle charging early warning runaway protection device, comprising a charging control box arranged on the charging circuit between the charging pile and the car charging port; three color indicator lights are arranged on the control box to indicate the corresponding status of thermal runaway; the control box obtains in real time the charging power of the electric vehicle during the fast charging process, the temperature sequence of each battery module under dynamic power and the SOC of the battery, and obtains in real time the output power, temperature, charging interface temperature and other parameters of the charging pile during the fast charging process; and controls the lighting status of the three color indicator lights according to the parameters obtained through monitoring.

[0007] The control box includes a processor and a cable cutting device; the output end of the processor is connected to the cable cutting device, which is used to control whether the charging loop cable for charging the vehicle is cut off.

[0008] A red, yellow and green three-color indicator light is set on the control box body; the processor in the control box determines the safety status of charging at this time based on the data obtained by monitoring, and lights up one of the colors of red, yellow and green based on the control indicator light corresponding to the safety status to issue an alarm indication.

[0009] When the processor determines that the current charging is in a normal state, the driving indicator light turns green; when it determines that it is in a warning state, the driving indicator light turns yellow; when it determines that it is in a thermal runaway abnormal state, the control indicator light turns red.

[0010] The protection device also includes a heat dissipation module arranged inside the charging pile, and the processor of the control box outputs a control signal to the heat dissipation module, which is used to control the heat dissipation module to start heat dissipation when the indicator light is in the warning state.

[0011] A power switch button and a manual cut-off button are provided on the control box panel; the power switch button is used to control whether the control box is powered on or not; the output end of the manual cut-off button is connected to the processor, and the processor controls the working state of the cable cutting device according to the state of the manual switch button.

[0012] The processor of the control box is connected to the CAN network of the charging vehicle via a CAN signal, and is used to send a cooling instruction to the charging vehicle in a warning state to start the battery cooling system of the charging vehicle.

[0013] The output end of the processor of the control box is connected to the controller of the charging pile or the controller of the charging station where the charging pile is located, and is used to upload a charging abnormality signal to control the charging of the charging pile or the entire charging station and the connection with the power grid according to the abnormal signal.

[0014] A protection method for an electric vehicle charging early warning out-of-control protection device comprises: a control box acquires in real time the charging power of the electric vehicle during a fast charging process, the temperature sequence of each battery module under dynamic power, and the SOC of the battery, and acquires in real time the output power, temperature, charging interface temperature and other parameters of the charging pile during the fast charging process; and performs the following protection control according to the acquired parameters:

[0015] When the signals interact normally, the indicator light of the drive control box is green; when it is detected that the maximum temperature of the electric vehicle battery module group or the internal temperature of the charging pile exceeds the set temperature range, the fan of the charging pile is started to cool the charging pile or the battery cooling system of the electric vehicle is started to cool the battery module group of the electric vehicle. During this process, the indicator light of the control box is yellow; when it is detected that the output current of the charging pile is greater than the required current of the electric vehicle, or the temperature of the charging interface is abnormal, the indicator light of the control box is red, an alarm sounds and the cable is automatically cut off immediately.

[0016] When all parameters operate normally within the set working range, that is, the charging pile temperature ≤ A1, the vehicle battery temperature < B1, the charging interface temperature ≤ C1, and the vehicle charging current < the vehicle demand current, the warning control box indicator light turns green;

[0017] When the parameter is within the set warning temperature range, the control box indicator light turns yellow and the warning protection function is activated, that is, when A1<charging pile temperature<A2, the control box issues a fan start command to the charging pile, and the fan runs to cool the charging pile; when B1≤vehicle battery temperature≤B2, the control box issues a battery cooling system start command to the vehicle, and the coolant circulates to cool the battery; when the charging pile temperature or battery temperature drops to within the threshold A1 or B1, the control box indicator light changes from yellow to green;

[0018] When the parameter operation exceeds the set boundary conditions, that is, the charging pile temperature ≥ A2, the vehicle battery temperature > B2 or the charging interface temperature ≥ C1 or the vehicle charging current > the vehicle demand current, the control box indicator light turns red, an alarm sounds, and the automatic cut-off device is immediately activated to disconnect the vehicle from the pile.

[0019] The advantages of the present invention are: it can monitor the status of electric vehicles and charging piles during the charging process, and will sound an alarm to remind the operator when an abnormality occurs. This device can also isolate the chain effect of electric vehicles or charging piles on other equipment when they catch fire, and intelligently solve the problems raised in the background technology. When the charging process is out of control, the charging cable is automatically cut off immediately to block the transmission of power and prevent the situation from getting worse. A control box is added to the charging cable, and a normal working range is preset. When the working range is exceeded, the operator is notified through an indicator light or an alarm sound, which has a quick response, low cost, and easy operation; it ensures the safety of the charging process and reduces the losses caused by risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The following is a brief description of the contents expressed in the drawings of the present invention and the symbols in the drawings:

[0021] Figure 1 A flow chart of a method for protecting an electric vehicle from charging failure with early warning provided by an embodiment of the present invention;

[0022] Figure 2 A connection diagram of an electric vehicle charging early warning out-of-control protection device provided by an embodiment of the present invention;

[0023] Figure 3 A schematic diagram of a control panel of an electric vehicle charging early warning out-of-control protection device provided by an embodiment of the present invention;

[0024] Figure 4 The present invention provides an electric vehicle charging early warning out-of-control protection device with a working principle.

[0025] Figure markings: 1-electric vehicle, 2-charging pile, 3-220V power supply, 4-control box, 5-charging cable connection inlet, 6-charging cable connection outlet, 7-charging interface, 8-control box processor, 9-air pump, 10-charging cable inlet ring, 11-electric cable outlet ring. DETAILED DESCRIPTION

[0026] The specific implementation of the present invention will be further explained in detail below by describing the optimal embodiment with reference to the accompanying drawings.

[0027] Compared with the charging warning out-of-control protection scheme in the prior art, this embodiment scheme adds an additional control box to monitor the charging out-of-control and can disconnect the charging, the charging pile, and the charging station in three power-off modes according to the monitoring status, thereby avoiding the defect that the charging out-of-control of the vehicle corresponding to a charging pile is transmitted to other charging vehicles or even the power grid at the same charging pile, resulting in the expansion of the accident. Therefore, a dedicated control box is provided to realize the charging out-of-control control. The specific scheme is as follows:

[0028] like Figure 2 , 3, 4 are the structural diagram of the charging box and the installation and connection diagram, the electric vehicle charging early warning out-of-control protection device, including a charging control box arranged on the charging circuit between the charging pile and the car charging port, and a control box is arranged on the charging gun circuit of each charging pile, and the charging circuit is controlled by the control box; wherein the charging box is provided with a charging cable connection inlet and a charging cable connection outlet, the charging cable of the charging pile is connected to the charging cable connection inlet, and then the cable is led out from the charging cable connection outlet after passing through the inside of the charging box, and a charging gun is provided at the end of the cable for connecting to the charging port of the vehicle to be charged.

[0029] The control box is provided with three color indicator lights to indicate the corresponding status of thermal runaway; the control box obtains the charging capacity of the electric vehicle, the temperature sequence of each battery module under dynamic power and the SOC of the battery in real time during the fast charging process, and obtains the output power, temperature, charging interface temperature and other parameters of the charging pile in real time during the fast charging process; the lighting status of the three color indicator lights is controlled according to the parameters obtained by monitoring.

[0030] The control box includes a processor and a cable cutting device; the output end of the processor is connected to the cable cutting device, which is used to control whether the charging circuit cable for charging the vehicle is cut off or not. The office cable cutting device includes an air pump, a charging cable inlet ferrule, and a charging cable outlet ferrule, which are used to realize the cutting control of the charging cable. The air pump is powered by a power supply, continuously compresses the air, generates air pressure, acts on the charging cable ferrule, and cuts off the connected charging cables; the charging cable connection form is a direct connection, that is, each signal in the control box does not affect each other and is transmitted separately; after the cable is cut off, the power transmission stops, the air pump power is unplugged, and the charging cable is reinserted to restore the charging function; therefore, the device does not damage the wiring harness and can be reused.

[0031] A red, yellow and green indicator light is set on the control box; the processor in the control box determines the safety status of the current charging according to the data obtained by monitoring, and lights up one of the colors of red, yellow and green based on the corresponding control indicator light of the safety status to issue an alarm indication. Different indicator light colors are used to give reminders according to whether the current charging status is normal and what state it is in when it is abnormal. Specifically:

[0032] When the processor determines that the current charging is in a normal state, the drive indicator light turns green; when it is determined to be in a warning state, the drive indicator light turns yellow; when it is determined to be in a thermal runaway abnormal state, the control indicator light turns red.

[0033] In order to achieve safety protection and control under different charging states, the protection device of this embodiment also includes a heat dissipation module arranged inside the charging pile. The processor of the control box outputs a control signal to the heat dissipation module, which is used to control the heat dissipation module to start heat dissipation when the indicator light is in the warning state. That is, when it is judged that the charging is in the warning state, the yellow indicator light is lit and the heat dissipation module is controlled to start. The heat dissipation module includes but is not limited to the heat dissipation system arranged inside the charging pile such as a heat dissipation fan and water cooling, and the heat dissipation system arranged inside the car. The heat dissipation of the battery, motor, etc. in the car is controlled by calling the heat dissipation system in the car. In order to realize the work of calling and controlling the heat dissipation system in the car, the processor of the control box is connected to the CAN network of the charging vehicle through the CAN signal, which is used to send a cooling instruction to the charging vehicle in the warning state to start the battery cooling system of the charging vehicle.

[0034] In this embodiment, a power switch button and a manual cut-off button are provided on the control box panel; the power switch button is used to control whether the control box is powered on or not; the output end of the manual cut-off button is connected to the processor, and the processor controls the working state of the cable cut-off device according to the state of the manual switch button. The power switch button is used to control the power supply working state of the processor and other components in the charging box, wherein the control box is provided with a charging socket, etc., which can realize the power supply to the control box. The manual cut-off switch is mainly to provide the user with a basis for manual control. When a fault occurs, the user can adjust and control whether to cut off the charging circuit according to his own judgment, realizing the initiative of user control.

[0035] In a preferred embodiment of the present application, the output end of the processor of the control box is connected to the controller of the charging pile or the controller of the charging station where the charging pile is located, and is used to upload the charging abnormality signal to control the charging of the charging pile or the entire charging station and the connection with the power grid according to the abnormal signal. When the processor of the control box determines that the current processing abnormal state is in progress, the indicator light will be turned on in a red light state, and the wire cutting device will be controlled to disconnect the cable of the charging circuit to achieve the purpose of disconnecting the charging. At the same time, the processor sends a request to the controller of the charging pile or charging station to disconnect the high-voltage power supply of the abnormally charging pile, so that the charging pile is in a power-off and stopped working state, providing a basis for subsequent rescue, etc., and avoiding the rescue safety hazards of charging piles and other live piles. Furthermore, the temperature data of the remaining charging piles in the charging station is monitored in real time, and based on the temperature data of the remaining charging piles, it is determined whether the thermal runaway of the charging pile has spread to the remaining charging piles. If the temperature of the remaining charging piles rises to a certain value within the set time range, it is determined that it has spread to the remaining charging piles. At this time, the controller of the charging station or the processor of the control box sends a request signal to the charging station controller, and at this time the entire charging station is controlled to disconnect from the high-voltage mains, thereby ensuring the safety of the entire charging station, avoiding the safety hazards caused by live rescue, and at the same time avoiding the impact of the failure of this charging station on the power grid.

[0036] like Figure 1-4 As shown, a method and device for electric vehicle charging early warning out-of-control protection in this embodiment can monitor the status of the electric vehicle and the charging pile during the charging process, and will issue an alarm to remind the operator when an abnormality occurs. This device can also isolate the chain effect of the electric vehicle or the charging pile on other equipment when it catches fire, thereby intelligently solving the problems raised in the background technology.

[0037] A method for early warning out-of-control protection of electric vehicle charging includes the following steps: the control box obtains the charging power of the electric vehicle during the fast charging process, the temperature sequence of each battery module under dynamic power, and the SOC of the battery in real time, and obtains the output power, temperature, charging interface temperature and other parameters of the charging pile during the fast charging process in real time. When the signal is interacting normally, the control box indicator light is displayed in green; when it is detected that the highest temperature of the electric vehicle battery module group or the internal temperature of the charging pile exceeds the set temperature range, the fan of the charging pile is started to cool the charging pile or the battery cooling system of the electric vehicle is started to cool the battery module group of the electric vehicle, and the control box indicator light is displayed in yellow during this process; when it is detected that the output current of the charging pile is greater than the required current of the electric vehicle, or the temperature of the charging interface is abnormal, the control box indicator light is displayed in red, an alarm sounds, and the cable is automatically cut off immediately to prevent the situation from further deteriorating.

[0038] The present invention provides an electric vehicle charging early warning out-of-control protection device, which includes a control box, a power cord, a charging cable connection inlet, and a charging cable connection outlet. The control box is located on the cable between the charging pile and the electric vehicle, and is an independent entity. The cable passes through the control box; the power source of the control box is an external 220V power input, or it can be powered by its own battery. The entire control device is started and stopped by the power input switch, and the charging status of the electric vehicle is indicated by the signal indicator light; the CAN signal connection line is separated inside the control box, and the parameter data of both ends of the vehicle pile are collected in real time, and the frequency is 1HZ; there is a cable cutting device inside the control box. When the charging indicator light is red, the device is immediately started to cut off the cable, or the cable is cut off by the manual cutting button on the control panel.

[0039] The control box panel has a power switch button, a power input socket, three charging signal indicators - red, yellow, and green, and a manual cut-off button. The two sides of the control box are the charging pile cable connection entrance and the charging pile cable connection exit. The charging process collects CAN signal data from both ends of the vehicle pile to determine the charging status. When the indicator light is green, it indicates that all parameters are operating normally within the working range; when the indicator light is yellow, it indicates that the internal temperature of the charging pile is in the warning range. At this time, the control box processor will issue instructions to the charging pile fan controller to rotate the fan to cool the charging pile, or the vehicle battery temperature is in the warning range. The control box processor will issue instructions to the vehicle battery cooling system to circulate the cooling system to cool the battery; when the indicator light is red, it indicates that the charging process parameters are out of control. At this time, the cable cutting device inside the control box is automatically started and a continuous alarm sounds. Personnel can also cut off the cable through the manual cut-off button on the control panel to prevent accidents.

[0040] In order to solve the problems existing in the prior art, an embodiment of the present invention provides a method and a device for early warning loss of control protection of an electric vehicle.

[0041] The working principle of this method can be seen in the following figure. Figure 1 Specifically, first connect the early warning device, insert the charging gun, start charging, and detect the charging demand information of the electric vehicle, charging voltage, current, various temperatures of the battery module group, voltage and current output by the charging pile, temperature of the charging pile, temperature of the charging interface and other parameter information in real time during the charging process; analyze various parameters to evaluate the safety of the charging process;

[0042] (1) When all parameters operate normally within the set working range, specifically, the charging pile temperature ≤ A1, the vehicle battery temperature < B1, the charging interface temperature ≤ C1, the vehicle charging current < the vehicle demand current, the warning control box indicator light turns green;

[0043] (2) When the relevant parameters are between the set warning temperature range, the control box indicator light turns yellow and the warning protection function is activated. Specifically, when A1 < charging pile temperature < A2, the control box issues a fan start command to the charging pile, and the fan runs to cool the charging pile; when B1 ≤ vehicle battery temperature ≤ B2, the control box issues a battery cooling system start command to the vehicle, and the coolant circulates to cool the battery. When the charging pile temperature or battery temperature drops to the temperature range of step (1), the control box indicator light changes from yellow to green, thereby repeatedly monitoring the status of various charging parameters.

[0044] (3) When the parameters exceed the set boundary conditions, specifically, the charging pile temperature ≥ A2, the vehicle battery temperature > B2, the charging interface temperature ≥ C1, and the vehicle charging current > the vehicle demand current, the control box indicator light turns red, an alarm sounds, and the automatic disconnection device is immediately activated to disconnect the vehicle from the pile.

[0045] The temperature thresholds A1, A2, B1, B2 and C1 are all pre-calibrated settings and can be set according to temperature resistance parameters of the charging station, vehicle, etc.

[0046] A connection diagram of an electric vehicle early warning out-of-control protection device, such as Figure 2 As shown, the two ends of the control box 4 are the charging cable inlet 5 connected to the charging pile 2, and the charging cable outlet 6 connected to the electric car 1. The device also needs to be connected to a 220V external input power supply 3 to provide power for the device to monitor various parameters and issue instructions. Figure 3 As shown, there are an external power socket, an external power switch, a manual cut-off switch, and a charging signal indicator light. The external power socket is connected to the external input power supply 3. After the connection, you need to turn on the control switch next to it. This switch is also part of the safety protection of the charging process. When the control switch is turned off, the charging is disconnected. When the control switch is closed, the charging starts; the manual cut-off switch is when the indicator light signal is red, and the control box does not automatically cut off the connection between the pile and the car. At this time, the charging cable can be manually cut off; the charging signal indicator light indicates the charging status. Green means normal operation, yellow means the charging pile or battery temperature is slightly high, but there is no risk for the time being, and red means abnormal working status, accompanied by an alarm sound, alerting the operator.

[0047] The working principle of an electric vehicle charging early warning out-of-control protection device is as follows Figure 4 As shown, the CAN high and CAN low circuits on the charging cable are independently connected inside the control box, and the charging pile temperature, charging voltage, current, battery module group temperature and battery SOC, etc., are monitored in real time during the charging process, and the parameter values ​​are sent to the control box. The control box processor analyzes and determines the safety of the charging process. If there is no problem, it continues to monitor; if the signal value is in the warning range, it will send instructions to the charging pile motor controller or the vehicle battery cooling system to make the motor or cooling system cycle to cool it down; if the signal value is in the out-of-control range, it will directly disconnect the connection between the charging pile and the vehicle, and cut off the external power connection line of the control box.

[0048] Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, they are all within the protection scope of the present invention.

Claims

1. An electric vehicle charging early warning out-of-control protection device, characterized in that: It includes a charging control box arranged on the charging circuit between the charging pile and the car charging port; three color indicator lights are arranged on the control box to indicate the corresponding status of thermal runaway; the control box obtains the charging power of the electric vehicle, the temperature sequence of each battery module under dynamic power and the SOC of the battery in real time during the fast charging process, and obtains the output power, temperature, charging interface temperature and other parameters of the charging pile during the fast charging process in real time; and controls the lighting status of the three color indicator lights according to the parameters obtained by monitoring.

2. The electric vehicle charging early warning out-of-control protection device according to claim 1, characterized in that: The control box includes a processor and a cable cutting device; the output end of the processor is connected to the cable cutting device, which is used to control whether the charging loop cable for charging the vehicle is cut off.

3. An electric vehicle charging early warning out-of-control protection device as claimed in claim 1 or 2, characterized in that: A red, yellow and green three-color indicator light is set on the control box body; the processor in the control box determines the safety status of charging at this time based on the data obtained by monitoring, and lights up one of the colors of red, yellow and green based on the control indicator light corresponding to the safety status to issue an alarm indication.

4. The electric vehicle charging early warning out-of-control protection device as claimed in claim 3, characterized in that: When the processor determines that the current charging is in a normal state, the driving indicator light turns green; when it determines that it is in a warning state, the driving indicator light turns yellow; when it determines that it is in a thermal runaway abnormal state, the control indicator light turns red.

5. The electric vehicle charging early warning out-of-control protection device as claimed in claim 4, characterized in that: The protection device also includes a heat dissipation module arranged inside the charging pile, and the processor of the control box outputs a control signal to the heat dissipation module, which is used to control the heat dissipation module to start heat dissipation when the indicator light is in the warning state.

6. An electric vehicle charging early warning out-of-control protection device as described in any one of claims 1-5, characterized in that: A power switch button and a manual cut-off button are provided on the control box panel; the power switch button is used to control whether the control box is powered on or not; the output end of the manual cut-off button is connected to the processor, and the processor controls the working state of the cable cutting device according to the state of the manual switch button.

7. An electric vehicle charging early warning out-of-control protection device as described in any one of claims 1 to 5, characterized in that: The processor of the control box is connected to the CAN network of the charging vehicle via a CAN signal, and is used to send a cooling instruction to the charging vehicle in a warning state to start the battery cooling system of the charging vehicle.

8. An electric vehicle charging early warning out-of-control protection device as described in any one of claims 1-5, characterized in that: The output end of the processor of the control box is connected to the controller of the charging pile or the controller of the charging station where the charging pile is located, and is used to upload a charging abnormality signal to control the charging of the charging pile or the entire charging station and the connection with the power grid according to the abnormal signal.

9. A protection method for an electric vehicle charging early warning out-of-control protection device according to any one of claims 1 to 8, characterized in that: The control box obtains the charging power of the electric vehicle during the fast charging process, the temperature sequence of each battery module under dynamic power, and the SOC of the battery in real time, and obtains the output power, temperature, charging interface temperature and other parameters of the charging pile during the fast charging process in real time; the following protection control is performed based on the collected parameters: When the signals interact normally, the indicator light of the drive control box is green; when it is detected that the maximum temperature of the electric vehicle battery module group or the internal temperature of the charging pile exceeds the set temperature range, the fan of the charging pile is started to cool the charging pile or the battery cooling system of the electric vehicle is started to cool the battery module group of the electric vehicle. During this process, the indicator light of the control box is yellow; when it is detected that the output current of the charging pile is greater than the required current of the electric vehicle, or the temperature of the charging interface is abnormal, the indicator light of the control box is red, an alarm sounds and the cable is automatically cut off immediately.

10. A protection method for an electric vehicle charging early warning out-of-control protection device as claimed in claim 9, characterized in that: When all parameters operate normally within the set working range, that is, the charging pile temperature ≤ A1, the vehicle battery temperature < B1, the charging interface temperature ≤ C1, and the vehicle charging current < the vehicle demand current, the warning control box indicator light turns green; When the parameter is within the set warning temperature range, the control box indicator light turns yellow and the warning protection function is activated, that is, when A1<charging pile temperature<A2, the control box issues a fan start command to the charging pile, and the fan runs to cool the charging pile; when B1≤vehicle battery temperature≤B2, the control box issues a battery cooling system start command to the vehicle, and the coolant circulates to cool the battery; when the charging pile temperature or battery temperature drops to within the threshold A1 or B1, the control box indicator light changes from yellow to green; When the parameter operation exceeds the set boundary conditions, that is, the charging pile temperature ≥ A2, the vehicle battery temperature > B2 or the charging interface temperature ≥ C1 or the vehicle charging current > the vehicle demand current, the control box indicator light turns red, an alarm sounds, and the automatic cut-off device is immediately activated to disconnect the vehicle from the pile.

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