A communication method and related device

Abstract

The present application provides a communication method and related devices, which relate to the field of communication. In the present application, a hard wire and a communication line for data transmission are connected between the charging controller and the liquid cooler, so that the communication transmission between the charging controller and the liquid cooler can be realized through the hard wire and the communication line, realizing dual communication guarantee, enhancing the reliability and security of the communication between the two, and improving the communication redundancy capability. Moreover, in the present application, the hard wire transmission efficiency is relatively high, which improves the communication transmission efficiency, and can timely transmit the fault information when the charging controller or the liquid cooler fails, realizing the timely response operation of the fault, and improving the efficiency and timeliness of fault handling.

Description

Technical Field

[0001] The present application relates to the field of communications, and more specifically, to a communication method and related devices. Background Art

[0002] With the continuous development of the charging pile industry, the charging power of charging piles continues to increase. In order to meet the demand for fast charging speed, liquid-cooled charging piles are designed. The liquid-cooled charging piles are mainly composed of a liquid cooler and a charging controller.

[0003] Since the liquid-cooled charging pile has the characteristics of high voltage and large current during charging, the need to ensure charging safety is particularly urgent. In order to ensure charging safety, it is necessary to ensure that the communication between the liquid cooler and the charging controller is timely and reliable. Then, how to achieve communication between the liquid cooler and the charging controller is a technical problem that technicians in this field need to solve urgently. Summary of the invention

[0004] In view of this, the present application provides a communication method and related devices to solve the problem of urgently needing to realize communication between a liquid cooler and a charging controller.

[0005] In order to solve the above technical problems, this application adopts the following technical solutions:

[0006] A communication method is applied to a charging controller, wherein a hard line and a communication line for data transmission are connected between the charging controller and a liquid cooler, and the communication method comprises:

[0007] When it is determined that the charging pile self-test has passed, the first communication data is transmitted to the liquid cooler through the communication line, and the hard-wire communication signal corresponding to the first communication data is transmitted to the liquid cooler through the hard wire, so that the liquid cooler performs the charging gun heat dissipation operation corresponding to the first communication data.

[0008] Optionally, after determining that the charging pile self-test has passed, before transmitting the hard-wire communication signal corresponding to the first communication data to the liquid cooler through the hard wire, the method further includes:

[0009] The first switch provided inside the charging controller is controlled to be closed so that the pulse width modulation (PWM) output end inside the charging controller is connected to the hard wire. The hard wire connection signal output by the PWM output end is output to the liquid cooler through the hard wire. When the liquid cooler receives the hard wire connection signal, the second switch inside the liquid cooler is closed to realize the conduction of the hard wire communication loop.

[0010] Optionally, one end of the first switch is used to connect to a power supply output end or the PWM output end, and the other end of the first switch is connected to one end of the hard line.

[0011] Optionally, the first communication data includes the temperature of the charging gun, and before the hard-wire communication signal corresponding to the first communication data is transmitted to the liquid cooler through the hard wire, the method further includes:

[0012] Determine the PWM duty cycle corresponding to the temperature of the charging gun;

[0013] A PWM signal corresponding to the PWM duty cycle is generated, wherein the PWM signal is a hard-line communication signal corresponding to the temperature of the charging gun.

[0014] Optionally, after controlling a first switch provided inside the charging controller to close, the method further includes:

[0015] If a fault is detected in the charging gun or the charging controller, the first switch is connected to the power output terminal to transmit a fixed voltage value to the liquid cooler, or the first switch is disconnected.

[0016] Optionally, after transmitting the first communication data to the liquid cooler through the communication line, and transmitting the hard-wire communication signal corresponding to the first communication data to the liquid cooler through the hard wire, the method further includes:

[0017] When receiving the second communication data transmitted by the liquid cooler, if the second communication data includes a preset fault identifier, connecting the first switch to the power output terminal, or disconnecting the first switch;

[0018] Alternatively, when a hard-line feedback signal transmitted by the liquid cooler is received, if the liquid cooler is determined to be faulty based on the hard-line feedback signal, the first switch is connected to the power supply output terminal, or the first switch is disconnected, wherein the hard-line feedback signal is used to indicate the fault condition of the liquid cooler.

[0019] Optionally, determining the liquid cooler failure according to the hard-line feedback signal includes:

[0020] When the voltage value in the hard-line feedback signal is not within a preset voltage range, it is determined that the liquid cooler is faulty.

[0021] Optionally, after transmitting the first communication data to the liquid cooler through the communication line, the method further includes:

[0022] When the second communication data transmitted by the liquid cooler through the communication line is not received within a preset time, an alarm message is output, where the alarm message is used to indicate that the communication line of the liquid cooler has timed out.

[0023] A charging controller is used to execute the above communication method.

[0024] A communication system, comprising a liquid cooler and the above-mentioned charging controller;

[0025] The liquid cooler is used to perform a heat dissipation operation of the charging gun corresponding to the first communication data.

[0026] Optionally, the charging controller is provided with a power output terminal, a PWM output terminal and a first switch; the liquid cooler is provided with a second switch;

[0027] One end of the first switch is used to connect the power supply output end or the PWM output end; the other end of the first switch is connected to one end of the hard line, the other end of the hard line is connected to one end of the second switch, and the other end of the second switch is used to ground;

[0028] When the first switch is connected to the PWM output terminal and the second switch is closed, the hard-wire communication loop is turned on.

[0029] Optionally, the liquid cooler performs a charging gun heat dissipation operation corresponding to the first communication data, including:

[0030] At least one of starting a cooling pump and adjusting a fan speed is performed based on the first communication data.

[0031] Optionally, the liquid cooler is also used for:

[0032] If a liquid cooler failure is detected, the second switch is opened to transmit a hard line feedback signal to the charge controller through the hard line.

[0033] A charging pile comprises the above-mentioned communication system and also comprises a charging gun; the charging gun is connected to the liquid cooler via a liquid cooling gun line.

[0034] The present application provides a communication method and related devices. In the present application, a hard wire and a communication line for data transmission are connected between the charging controller and the liquid cooler, so that the communication transmission between the charging controller and the liquid cooler can be realized through the hard wire and the communication line, realizing dual communication guarantee, enhancing the reliability and security of the communication between the two, and improving the communication redundancy capability. In addition, in the present application, the hard wire transmission efficiency is high, which improves the communication transmission efficiency, and can timely transmit the fault information when the charging controller or the liquid cooler fails, realizing the timely response operation of the fault, and improving the efficiency and timeliness of fault handling. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0036] Figure 1 A device communication link diagram provided for an embodiment of the present application;

[0037] Figure 2 A schematic diagram of the structure of a communication system provided in an embodiment of the present application;

[0038] Figure 3 A flow chart of a communication method provided in an embodiment of the present application;

[0039] Figure 4 A schematic diagram of a PWM signal provided in an embodiment of the present application;

[0040] Figure 5 A flowchart of another communication method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0042] With the continuous development of the charging pile industry, the charging power of charging piles continues to increase. In order to meet the demand for fast charging speed, liquid-cooled charging piles are designed. The liquid-cooled charging piles are mainly composed of a liquid cooler and a charging controller.

[0043] Since the liquid-cooled charging pile has the characteristics of high voltage and large current during charging, the need to ensure charging safety is particularly urgent. In order to ensure charging safety, it is necessary to ensure that the communication between the liquid cooler and the charging controller is timely and reliable. Then, how to achieve communication between the liquid cooler and the charging controller is a technical problem that technicians in this field need to solve urgently.

[0044] To this end, a communication method and related devices are provided in the embodiments of the present application. In the present application, a hard wire and a communication line for data transmission are connected between the charging controller and the liquid cooler, so that the communication transmission between the charging controller and the liquid cooler can be realized through the hard wire and the communication line, realizing dual communication guarantee, enhancing the reliability and security of the communication between the two, and improving the communication redundancy capability. In addition, in the present application, the hard wire transmission efficiency is relatively high, which improves the communication transmission efficiency, and can timely transmit the fault information when the charging controller or the liquid cooler fails, realizing the timely response operation of the fault, and improving the efficiency and timeliness of fault handling.

[0045] Based on the above content, an embodiment of the present application provides a communication method, which is applied to a charging controller. In order to improve the communication reliability, the present application adopts a method of communicating with two communication lines at the same time. Specifically, refer to Figure 1 A hard line and a communication line for data transmission are connected between the charging controller and the liquid cooler.

[0046] Among them, the communication line is a twisted wire composed of multiple strands of fine wires, which can be flexibly bent, easy to lay, and has stable transmission speed and transmission distance. Hard wire is usually composed of a single copper or aluminum wire conductor, wrapped in an insulating layer. This structure makes it have a certain hardness, and the hard wire has a faster transmission speed.

[0047] Generally, the communication line adopts a one-response-one-answer method, and when the data is received, a verification operation is required, which makes the data transmission method using the communication line have a large communication delay and poor security. When the hard wire is transmitted, the data can be transmitted directly, and no response and verification are required, which can improve the transmission efficiency. Therefore, in this application, the hard wire and the communication line are used in combination to improve the data transmission efficiency. In addition, in this application, the combination of the two can achieve dual communication protection and strong communication redundancy. When both are normal, the two communication links perform data transmission operations. When one of them is abnormal, the other communication link can still transmit data normally, improving reliability and stability.

[0048] Reference Figure 2 , Figure 2 The communication scenarios of the charging controller and the liquid cooler are given. The liquid-cooled charging pile consists of a charging controller, a power output module, a liquid cooler, and a liquid cooling gun line (referring to the power line between the liquid cooler and the charging gun). The charging controller and the power output module communicate via a communication line, and the power output module and the liquid cooler communicate via a power line. The power line between the power output module and the liquid cooler does not need to be moved frequently, so a copper wire with a large square number can be used. The power line between the liquid cooler and the charging gun needs to move with the charging gun during the process of inserting the charging gun into the vehicle charging port and removing it from the vehicle charging port. Therefore, the power line uses a lighter liquid cooling gun line.

[0049] In an actual charging scenario, the charging gun is connected to the vehicle, and the charging controller obtains the vehicle's required charging voltage and required charging current, and calculates the charging power based on the required charging voltage and the required charging current, such as P=UI, where P is the charging power, U is the required charging voltage, and I is the required charging current.

[0050] The charging controller schedules the power output based on the charging power, and outputs the charging power to the liquid cooler through the power output module. The liquid cooler charges the vehicle through the liquid cooling gun line and the charging gun. The power of the vehicle charging is the calculated charging power. After the charging is completed or the charging is completed due to a fault or abnormal reason, in order to avoid the internal temperature accumulation of the charging gun, which may damage the charging gun, the charging controller can adjust the fan speed to the preset speed, continue to dissipate heat for a period of time, and finally control the fan to stop.

[0051] During the charging process, the liquid cooler is responsible for controlling the temperature of the charging gun line within the normal working range. The liquid cooler will turn on the cooling pump during the charging process to take away the heat through the coolant, and the fan will blow the heat out of the machine to meet the super charging function of high current charging.

[0052] The charging controller is equipped with a voltage acquisition module, which can detect the voltage and current of the charging gun, so as to shut down the charging gun in time when the charging gun is overcurrent, overvoltage or overtemperature. The charging controller can also detect internal faults of the charging controller. When the internal fault is large, it is also necessary to shut down the controller in time.

[0053] Similarly, a voltage acquisition module is also configured inside the liquid cooler to detect whether the liquid cooler is faulty or abnormal. When the fault or abnormality is serious, it is also necessary to shut down the machine.

[0054] In order to realize hard-wire communication between the charge controller and the liquid cooler, a power output terminal, a PWM (Pulse Width Modulation) output terminal, a first switch S1, and a first resistor R1 are arranged inside the charge controller. A second resistor R2 and a second switch S2 are arranged inside the liquid cooler.

[0055] One end of the first switch S1 can be selectively connected to the power output end or the PWM output end. When hard-wire communication is used, the first switch S1 is connected to the PWM output end. When the charging control end fails or the charging gun fails, the first switch S1 is connected to the power output end, or is directly disconnected. The other end of the first switch S1 is connected to the first resistor R1, the first resistor R1 is connected to one end of the hard wire, the other end of the hard wire is connected to the second resistor R2, the second resistor R2 is connected to one end of the second switch S2, and the second switch S2 can be selectively grounded. If the first switch S1 is connected to the PWM output end and the second switch S2 is closed, the PWM output end, S1, R1, hard wire, R2, S2 and ground form a complete communication loop, and the charging controller can communicate with the liquid cooler through the hard wire. It is considered that the hard-wire communication loop is turned on at this time. If the first switch S1 is connected to the power output end, the first switch S1 is directly disconnected or the second switch S2 is opened, the hard-wire communication loop is turned off.

[0056] exist Figure 2 Based on the structure, refer to Figure 3 , the communication methods include:

[0057] S11, determine whether the charging pile self-test has passed; if it has passed, execute step S12; if it has not passed, prohibit charging, and output a prompt message that the charging pile self-test has not passed, so as to perform maintenance operations on the charging pile in time.

[0058] When the charging pile is used, such as when the charging gun is inserted into the charging port of the vehicle, or when the charging pile is powered on, the charging controller needs to perform a self-test of the charging pile. During the self-test, the internal sensors and communication functions are tested, such as access control, emergency stop, lightning protection, flooding and dumping. If the self-test passes, charging can begin.

[0059] S12. Transmitting the first communication data to the liquid cooler through the communication line, and transmitting the hard-wire communication signal corresponding to the first communication data to the liquid cooler through the hard wire, so that the liquid cooler performs the charging gun heat dissipation operation corresponding to the first communication data.

[0060] Specifically, if the charging pile passes the self-test, it means that the charging pile can be powered on and used normally. Figure 2 As shown, the charge controller and the liquid cooler can transmit data via hard wires and communication lines to understand each other's operating status and charging conditions.

[0061] Among them, due to the communication configuration between the charging controller and the liquid cooler, the communication line transmits more data content, which can transmit system status, fault status word, oil pump, fan speed, charging gun temperature (specifically refers to the gun head temperature) and other data. Among them, the fault status word is a specific fault, such as too high liquid level, too high temperature, too high voltage, etc.

[0062] The data content of hard-wire transmission is relatively small, and it can only transmit the charging gun temperature, normal operation or fault signals through PWM signals.

[0063] Later, taking the transmission of charging gun temperature as an example, the working process of hard wire and communication line is introduced.

[0064] During the charging process, if the temperature of the charging gun is high, it will affect the charging safety. Therefore, in the embodiment of the present application, the temperature of the charging gun is collected and transmitted to the liquid cooler as communication data, so that the liquid cooler performs heat dissipation operation.

[0065] In actual applications, since the charging controller and the liquid cooler communicate with each other through hard wires and communication lines respectively, in this embodiment, the communication data transmitted from the charging controller to the liquid cooler through the communication line is called the first communication data, and the communication data transmitted from the liquid cooler to the charging controller through the communication line is called the second communication data.

[0066] The communication data transmitted from the charge controller to the liquid cooler via hard wire is called a hard wire communication signal, and the communication data transmitted from the liquid cooler to the charge controller via hard wire is called a hard wire feedback signal.

[0067] The above-mentioned charging gun temperature is transmitted to the liquid cooler via the first communication data and the hard-line communication signal respectively.

[0068] When the first communication data is transmitted through the communication line, the first communication data can be directly transmitted to the liquid cooler through the communication line, and the charging controller and the liquid cooler communicate data in a one-to-one and verification manner. The data transmission process for transmitting other data, such as system status, fault status word, oil pump, and fan speed is the same as the transmission process for transmitting the charging gun temperature, only the transmission content is different. In addition, all the data that needs to be transmitted can be transmitted to the liquid cooler together through the first communication data to reduce the number of interactions between the charging controller and the liquid cooler.

[0069] When the first communication data is transmitted through the hard line, the first communication data needs to be converted based on the hard line communication method. Generally, the hard line adopts the PWM communication method. At this time, the first communication data needs to be converted into a hard line communication signal, and then the hard line communication signal is transmitted to the liquid cooler through the hard line.

[0070] In another implementation of the present invention, if the first communication data includes the charging gun temperature, generating a hard-wire communication signal corresponding to the first communication data specifically refers to:

[0071] Determine the PWM duty cycle corresponding to the charging gun temperature, and generate a PWM signal corresponding to the PWM duty cycle, wherein the PWM signal is a hard-line communication signal corresponding to the charging gun temperature. That is, the charging gun temperature can be represented by the PWM duty cycle, and after receiving the PWM signal, the temperature information of the charging gun can be obtained according to its duty cycle.

[0072] The waveform of the hard-wired communication signal, that is, the PWM signal, is as follows Figure 4 As shown, Figure 4 The waveform change cycle in is 1 / f, where f is the frequency. In one waveform cycle, the duty ratios of the positive waveform and the negative waveform are different, and the duty ratio is related to the charging gun temperature. Therefore, in the embodiment of the present application, after the charging controller collects the charging gun temperature, the PWM duty ratio is calculated based on the charging gun temperature, and then the PWM duty ratio is calculated according to the charging gun temperature. Figure 4 The waveform shown generates a PWM signal corresponding to the PWM duty cycle. The corresponding relationship between the hard-wire transmission PWM duty cycle and the charging gun temperature value is shown in Table 1. The charging controller sets the duty cycle of the PWM control hard-wire signal according to Table 1 to inform the liquid cooler of the current charging gun temperature (such as the gun head temperature). The transmission temperature range is -30-105°C.

[0073] Table 1

[0074]

[0075] Specifically, the corresponding relationship between the hard-wire transmission PWM duty cycle and the temperature value is shown in Table 1. After receiving the PWM signal, the liquid cooler analyzes the duty cycle of the PWM signal, and then calculates the gun tip temperature according to the calculation method of the gun tip temperature T℃. According to the above Table 1, charging is allowed when the temperature range is between -30 and 105 degrees, and if the temperature is lower than -30 degrees or higher than 105 degrees, charging is not allowed.

[0076] It can be understood that after the liquid cooler receives the PWM signal through the hard line (that is, it can know the temperature of the charging gun) or receives the first communication data through the communication line, it can know the current temperature of the charging gun and perform the heat dissipation operation corresponding to the temperature.

[0077] It should be noted that if the liquid cooler receives the charging gun temperature through the first communication data and the PWM signal in the communication line at the same time, one of the temperatures can be selected to perform heat dissipation operation on the charging gun. In general, if both the communication line and the hard line are working normally, the temperature value preferentially received by the liquid cooler can be used as the basis for heat dissipation control of the liquid cooler. In general, due to the high data transmission speed of the hard line, the temperature of the charging gun transmitted by the hard line will reach the liquid cooler first. Therefore, the liquid cooler generally uses the temperature of the charging gun transmitted by the hard line for heat dissipation control.

[0078] If the communication line is abnormal, such as the data transmitted by the communication line cannot be received, the data transmitted by the hard line is used for heat dissipation control. If the hard line transmission is abnormal, such as the hard line cannot transmit data due to disconnection, the communication line is used to transmit data for heat dissipation operation.

[0079] In order to prevent the charging gun from overheating, the liquid cooler will perform heat dissipation on the charging gun. For example, during the charging process, the liquid cooler will turn on the cooling pump to take away the heat through the coolant, or turn on the fan to blow the heat out of the machine, thereby meeting the supercharging function of high-current charging. In specific implementation, you can choose to turn on the cooling pump for heat dissipation and adjust the fan speed according to the actual heat dissipation needs.

[0080] The flow rate or flow rate of the coolant and the speed of the fan are related to the temperature of the charging gun. If the temperature of the charging gun is high, the flow rate of the coolant will be faster or the flow rate will be larger, and the fan speed will be faster. If the temperature of the charging gun is low, the flow rate of the coolant will be slower or the flow rate will be smaller, and the fan speed will be slower.

[0081] It is understandable that if the temperature inside the liquid cooler is high, such as exceeding the high temperature threshold, the cooling pump and fan can be used for heat dissipation at the same time, and the flow rate and flow of the cooling pump and the speed of the fan are both high. If the temperature inside the liquid cooler is normal, you can choose to dissipate heat by using either the cooling pump or the fan, and the flow rate and flow of the cooling pump and the speed of the fan should match the current temperature. If the temperature inside the liquid cooler is low, stop running the cooling pump and fan, that is, do not perform heat dissipation at this time.

[0082] In this embodiment, a hard wire is added between the charging controller and the liquid cooler, and the charging controller and the liquid cooler exchange information through the communication line. At the same time, the charging controller controls the first switch S1 to close to output the PWM signal to the hard wire. After detecting the PWM signal, the liquid cooler closes the second switch S2 to conduct the entire hard wire loop, so that the charging controller and the liquid cooler can exchange information through the hard wire. Since the charging controller and the liquid cooler are connected with a hard wire and a communication line for data transmission, the communication transmission between the charging controller and the liquid cooler can be realized through the hard wire and the communication line, realizing dual communication guarantee, enhancing the reliability and security of the communication between the two, and improving the communication redundancy capability. Moreover, in the present application, the hard wire transmission efficiency is relatively high, which improves the communication transmission efficiency. When the charging controller or the liquid cooler fails, the fault information can be transmitted in time, realizing a timely response to the fault, and improving the efficiency of fault handling.

[0083] In another implementation of the present application, in order to realize hard-wire communication, it is necessary to connect the first switch S1 to the PWM output terminal and close the second switch S2. After determining that the charging pile self-test has passed, before transmitting the hard-wire communication signal corresponding to the first communication data to the liquid cooler through the hard wire, it also includes:

[0084] The first switch S1 provided inside the charging controller is controlled to be closed so that the PWM output end inside the charging controller is connected to the hard wire. The hard wire connection signal output by the PWM output end is output to the liquid cooler through the hard wire. When the liquid cooler receives the hard wire connection signal, the second switch inside the liquid cooler is closed to realize the conduction of the hard wire communication loop.

[0085] Specifically, after the charging pile passes the self-test and before sending the hard-line signal, the first switch S1 set inside is controlled to be closed. Figure 2 As shown, the connection relationship of the first switch S1 is:

[0086] One end of the first switch is used to connect to the power supply output end or the PWM output end, and the other end of the first switch is connected to one end of the hard line. Further, the other end of the first switch can be connected to one end of the hard line through a first resistor R1, and the other end of the hard line is connected to one end of a second switch S2 through a second resistor R2, and the other end of the second switch S2 is grounded. Resistors R1 and R2 mainly play the role of protecting the circuit.

[0087] Exemplarily, the first switch S1 may be a single-pole double-throw switch, the fixed end of the single-pole double-throw switch is connected to the first resistor R1, and the movable end may be connected to the power output end or the PWM output end. In addition, the first switch S1 may be directly disconnected, that is, it is neither connected to the power output end nor to the PWM output end.

[0088] On the basis of this circuit structure, controlling the first switch S1 to close means: connecting the first switch S1 connected to the hard wire to the PWM output end. After the first switch S1 is connected to the PWM output end, the PWM output end outputs a hard wire connection signal, and the hard wire outputs the hard wire connection signal to the liquid cooler. Among them, the hard wire connection signal can be a PWM signal corresponding to the temperature of the charging gun. After the liquid cooler receives the hard wire connection signal, the second switch S2 inside the liquid cooler is closed, and the hard wire communication loop between the charging controller and the liquid cooler will be turned on. The hard wire communication loop is turned on when the first switch S1 is connected to the PWM output end and the second switch S2 is closed. At this time, the PWM output end, S1, R1, hard wire, R2, S2 and ground form a complete communication loop, and the charging controller can communicate with the liquid cooler through the hard wire.

[0089] After the hard-wire communication loop is turned on, the charging gun temperature and fault information can be transmitted through the hard-wire. At the same time, the charging gun temperature and fault status word will also be transmitted to the liquid cooler through the communication line. In addition, the charging controller also uses the communication line to obtain data such as the liquid cooler interactive system status, oil pump, fan speed, etc.

[0090] In this embodiment, by controlling the first switch S1 to be connected to the PWM output terminal and closing the second switch S2, the charging controller can communicate with the liquid cooler through a hard line. Compared with the method of transmitting data only through the communication line, the embodiment of the present invention can transmit data through both the communication line and the hard line, thereby expanding the communication method. Moreover, both the hard line and the communication line transmit the charging gun temperature and fault information, two important information that affect charging safety. When one of the links fails (such as being unable to transmit data), data can also be transmitted through another link, thereby improving the fault resistance capability.

[0091] After the above embodiment controls the first switch S1 to be connected to the PWM output terminal and closes the second switch S2, the charging controller can communicate with the liquid cooler through a hard line. During the communication process, if the charging gun or the charging controller fails, the hard line connection can be disconnected so that the liquid cooler cannot receive the signal sent by the other party. At this time, for charging safety, the charging operation will be stopped. Alternatively, a voltage value indicating a fault is transmitted using a hard line to timely understand the other party's fault information, and for charging safety, the charging operation is stopped. That is, if a fault is detected in the charging gun or the charging controller, the first switch is connected to the power output terminal to transmit a fixed voltage value to the liquid cooler, or the first switch is disconnected.

[0092] It should be noted that if the power output terminal is not provided in order to save components inside the charge controller and reduce line connections, the fault information can be transmitted through a hard line by directly disconnecting the first switch. If the charge controller is provided with a power output terminal inside, either connecting the first switch to the power output terminal to transmit a fixed voltage value to the liquid cooler or disconnecting the first switch can be adopted.

[0093] At the same time, the fault information is also transmitted to the liquid cooler through the communication line, and the fault information is transmitted through both communication links to improve the communication reliability between the charge controller and the liquid cooler. When the data transmitted through at least one link of the communication line and the hard line determines that the charge controller or the charging gun is faulty, it is considered that the charge controller or the charging gun is faulty.

[0094] In one implementation, when a fault is transmitted through a hard line and a communication line, it is first detected whether a fault exists. If a fault exists, the fault information can be transmitted through the hard line and the communication line.

[0095] It can be understood that the charging controller can detect whether the charging gun and the charging controller are faulty respectively.

[0096] Specifically, the charging controller can detect whether the charging gun has at least one fault of overvoltage, overcurrent and overtemperature.

[0097] Exemplarily, a voltage acquisition module can be set inside the charging controller, which can detect the voltage and current of the charging gun, and determine whether the charging gun has overcurrent and overvoltage by analyzing the voltage and current values. Exemplarily, the voltage acquisition module can also be used to detect the temperature of the charging gun. Specifically, the charging gun has a built-in NTC (Negative Temperature Coefficient) thermistor, and the voltage acquisition module can collect the voltage value of the NTC thermistor, convert the voltage value into a resistance value, and then query the charging gun temperature corresponding to the resistance value to determine whether it is overheated.

[0098] Generally, the charging gun is equipped with multiple NTC thermistors, such as two NTC thermistors. Since the two NTC thermistors are arranged at different positions inside the charging gun, the charging gun temperatures detected by the two NTC thermistors are different. In the embodiment of the present invention, since the hard wire transmission content is less, when the charging gun temperature is positive, the charging controller transmits the maximum charging gun temperature to the liquid cooler through the hard wire, and when the charging gun temperature is negative, the charging controller transmits the minimum charging gun temperature to the liquid cooler through the hard wire, so that the liquid cooler performs heat dissipation control according to the temperature extreme value (maximum value or minimum value) to meet the maximum heat dissipation demand. At the same time, since the communication line can transmit more data, the charging gun temperatures detected by the two NTC thermistors can be transmitted to the liquid cooler through the communication line. The liquid cooler preferentially receives the charging gun temperature transmitted by which communication link (hard wire or communication line), and performs heat dissipation control according to the temperature. If the charging gun temperature sent by the hard wire and the communication line is received at the same time, a more accurate temperature can be selected for heat dissipation control after mutual verification, or a charging gun temperature can be selected randomly or according to a strategy for heat dissipation control.

[0099] In addition, the charging controller can also detect whether there is a communication fault in the charging controller, and the communication fault includes at least one of a vehicle-side communication abnormality and an internal communication abnormality of the charging controller.

[0100] Specifically, the charging controller can interact with the vehicle side, receive user instructions or receive vehicle side status data, etc. The interaction between the two enables the charging controller to understand the charging needs of the vehicle or the current status of the vehicle. If the charging controller cannot receive vehicle information, it is considered that the vehicle side communication is abnormal, which means that there is an abnormality in the vehicle side communication of the charging controller. In addition to communicating with the vehicle side, the charging controller can also realize internal communication, such as: when receiving an instruction sent by the emergency stop button set on the charging pile, the charging controller can theoretically respond to the emergency stop button and perform an emergency stop operation. However, in actual applications, there is a situation where the emergency stop button is pressed, but the charging controller does not respond. At this time, it is considered that the internal communication of the charging controller is abnormal. In addition, more communication failure content can be configured according to actual needs. Communication failure includes at least one of abnormalities such as vehicle-side communication abnormality and charging controller internal communication abnormality.

[0101] When it is detected that the charging gun has a fault, and / or the charging controller has a communication fault, that is, at least one of the charging gun and the charging controller has a fault, it is necessary to inform the liquid cooler of the fault information, such as sending the information of the vehicle-side communication abnormality or the internal communication abnormality of the charging controller to the liquid cooler through the communication line and / or hard line. Among them, when transmitting through the communication line, the specific fault, such as the vehicle-side communication abnormality or the internal communication abnormality of the charging controller, can be transmitted to the liquid cooler so that the liquid cooler understands the specific fault of the charging controller. However, when transmitting through the hard line, since the hard line transmits the fault information by transmitting a fixed voltage value or not transmitting data, the transmission content is limited, and it can only be determined whether a fault occurs based on this information, but the specific fault type cannot be determined.

[0102] In one embodiment, when fault information is transmitted via a hard line, after a fault is detected in the charging gun or the charging controller, the first switch can be connected to the internal power output terminal, and a fixed voltage value, such as 12V voltage, will be transmitted on the hard line. The liquid cooler can perform corresponding control based on the voltage data transmitted by the hard line, such as stopping charging. It is understandable that after receiving the fixed voltage, the liquid cooler learns that the charging controller or the charging gun has a fault. At this time, in order to ensure charging safety, the charging operation can be stopped. If the liquid cooler determines that the current charging gun temperature is still high and it needs to continue to dissipate heat for a period of time, the cooling pump can be continuously turned on for heat dissipation and the fan speed can be adjusted for heat dissipation. If the liquid cooler does not need to dissipate heat, the cooling pump and fan can be directly stopped.

[0103] In another embodiment, when fault information is transmitted through a hard line, the first switch can be directly disconnected when a fault is detected in the charging gun or the charging controller. At this time, the hard line stops outputting signals to the liquid cooler. Since the liquid cooler cannot receive the hard line signal, it is necessary to stop the charging operation for charging safety.

[0104] It can be understood that in actual scenarios, there are two situations that will cause the hard line to stop outputting signals to the liquid cooler. One is that the hard line is damaged, such as a certain part of the hard line is cut off, at which time the hard line stops outputting signals to the liquid cooler, and the other is that the charging controller disconnects the first switch S1. Therefore, when the liquid cooler cannot receive the hard line signal, it actually does not know why the hard line stops transmitting signals, but for safety reasons, the charging operation will be uniformly stopped. When the first switch is connected to the internal power output terminal, a fixed voltage value will be transmitted to the liquid cooler on the hard line. After the liquid cooler receives the fixed voltage value, through the communication configuration of the charging controller and the liquid cooler, it is assumed by default that the other party is faulty when the fixed voltage value is received. In this embodiment, since the voltage value is a fixed voltage value, it can be clearly known that the charging gun or the charging controller has a fault, which is convenient for the liquid cooler to timely understand the operating status of the charging controller. Therefore, in order to enable the liquid cooler to timely understand the current reason for stopping charging, it can be preferably used to connect the first switch to the power output terminal to transmit a fixed voltage value to the liquid cooler when the charging gun or the charging controller has a fault.

[0105] In the above embodiments, the charging controller can transmit its own abnormal system status to the liquid cooler via hard wire and / or communication line, and the liquid cooler can also transmit its own abnormal system status to the charging controller via hard wire and / or communication line.

[0106] It can be understood that after the first communication data is transmitted to the liquid cooler through the communication line, and the hard-wire communication signal corresponding to the first communication data is transmitted to the liquid cooler through the hard wire, when the second communication data transmitted by the liquid cooler is received, if the second communication data includes a preset fault identifier, the first switch is connected to the power supply output terminal, or the first switch is disconnected.

[0107] Specifically, the liquid cooler can transmit fault information of the liquid cooler through the communication line, such as the transmitted fault information is that the liquid level is too high. Specifically, the fault information can be in the form of a preset fault identifier, and the preset fault identifier can be a fault status word, which is located in the second communication data transmitted by the liquid cooler through the communication line. When the charging controller receives the second communication data transmitted by the liquid cooler, if the second communication data includes the preset fault identifier, it indicates that the liquid cooler is faulty. At this time, the first switch can be connected to the power output terminal, or the first switch can be disconnected. The specific implementation process refers to the above corresponding instructions.

[0108] The above embodiment introduces the transmission of the fault information of the liquid cooler through the communication line. In another implementation, the fault information of the liquid cooler can also be transmitted through the hard line at the same time. Specifically, when a hard line feedback signal transmitted by the liquid cooler is received, if the liquid cooler is determined to be faulty according to the hard line feedback signal, the first switch is connected to the power supply output terminal, or the first switch is disconnected, wherein the hard line feedback signal is used to indicate the fault condition of the liquid cooler.

[0109] Specifically, when the liquid cooler fails or detects that the duty cycle of the PWM signal is within the non-chargeable range, the liquid cooler cuts off the second switch S2 and changes the voltage value on the hard line to inform the charging controller of the current system status. During operation, the charging controller receives the hard line feedback signal transmitted by the liquid cooler through the hard line, and determines the fault state of the liquid cooler by detecting whether the voltage in the hard line feedback signal transmitted by the hard line is within the preset voltage range, and then decides whether to continue charging. Among them, the preset voltage range can be within 6V. If the voltage value received by the charging controller is 9V, it means that it is not within the preset voltage range, and the liquid cooler is considered to be faulty.

[0110] In the case of receiving a hard-line feedback signal transmitted by the liquid cooler to indicate a fault condition of the liquid cooler, if the liquid cooler is determined to be faulty based on the hard-line feedback signal, charging is stopped at this time, the first switch can be connected to the power output terminal to stop outputting the PWM signal, and the first switch can also be directly disconnected. The specific implementation process refers to the corresponding instructions above.

[0111] In this embodiment, when the charging controller fails, the charging controller disconnects the first switch S1, or switches the movable end of the first switch S1 from the PWM output end to the power output end, changes the voltage value on the hard line to inform the liquid cooler of the fault information, and stops the PWM output information at the same time. During the operation of the liquid cooler, the fault state of the charging controller is judged by detecting whether there is voltage on the hard line or whether the voltage is within the preset voltage range, and decides whether to continue working. In addition, when the liquid cooler fails or detects that the duty cycle of the PWM signal is within the non-chargeable range, the liquid cooler cuts off the second switch S2 to change the voltage value on the hard line, and then informs the charging controller of the fault information of the liquid cooler. During the operation of the charging controller, the fault state of the liquid cooler is judged by detecting whether the voltage on the hard line is within the voltage range, and decides whether to continue working. In addition, the liquid cooler can also transmit the second communication data including the preset fault identifier through the communication line, and inform the charging controller of the specific fault information of the liquid cooler, so that the charging controller can understand the operation of the liquid cooler, output the corresponding control in time, and ensure charging safety. The charging controller can also transmit its own fault information to the liquid cooler through the communication line.

[0112] The above embodiments introduce the processing process of the charging controller and the liquid cooler failure. In another implementation of the present application, the communication line and the hard line may have a fault, wherein the hard line fault may be a hard line disconnection, at which time the charging operation is stopped. The specific implementation process refers to the description in the above corresponding embodiments. The embodiments of the present invention provide a detailed description of the communication line fault, such as the failure of the communication line to transmit data.

[0113] Specifically, when the second communication data transmitted by the liquid cooler through the communication line is not received for more than a preset time, an alarm message is output, where the alarm message is used to indicate that the communication line of the liquid cooler has timed out.

[0114] Among them, for the sake of communication reliability, the preset time can be set to 10s. If the liquid cooler does not reply to the communication data for more than 10S, it is judged as a communication timeout. When it is determined that the liquid cooler does not reply to the communication data for more than 10S, it can be judged whether the charging controller cannot receive the second communication data sent by the liquid cooler after more than 10S. If so, it is determined that the communication line is faulty, and the charging controller reports a liquid cooler communication timeout alarm. The system is in an alarm state and can continue to work.

[0115] In this embodiment, if the second communication data transmitted by the liquid cooler through the communication line is not received for a preset time, a liquid cooler communication line timeout alarm operation is performed to enable the technician to understand the abnormal state of the communication line, find out the cause in time, and perform corresponding repair or debugging work. In the case of a communication line failure, the communication between the charging controller and the liquid cooler can be performed by a hard line alone to ensure the normal operation of the system.

[0116] As can be seen from the above, the charging controller and the liquid cooler are doubly connected via a communication line and a hard line, and the system status of the charging controller and the system status of the liquid cooler can be transmitted on the communication line and the hard line at the same time. After starting charging, the charging controller switches the S1 switch to the PWM output. After the liquid cooler detects the PWM signal, it closes the S2 switch to turn on the hard line. The charging gun temperature data and fault information of the charging controller are transmitted via the hard line and the communication line. When using a dual link of hard line and communication line to transmit data, if one link fails, the other link is used for data transmission, which can be seamlessly connected without affecting the charging function and realizing redundancy of the communication function.

[0117] It should be noted that in actual scenarios, there may be inconsistencies between the data transmitted via the communication line and the hard-wired data. For example, the second communication data transmitted via the communication line is analyzed to indicate a liquid cooler failure, but the hard-wired feedback signal output by the liquid cooler does not indicate that there is a liquid cooler failure. At this time, for the sake of charging reliability, as long as one of the signals indicates a liquid cooler failure, it is considered that the liquid cooler is faulty and the charging operation is disconnected.

[0118] In order for those skilled in the art to understand the present application more clearly, Figure 5 The specific implementation in this application is introduced.

[0119] The charging terminal performs self-inspection to test the internal sensors and communication functions.

[0120] Determine whether the self-test has passed. If the self-test has not passed, disconnect the first switch S1, or switch the first switch S1 to the power output end to stop the PWM output, so that the liquid cooler can timely understand the fault information of the charging gun or charging controller. In addition, the fault information can be transmitted to the liquid cooler through the communication line, and the liquid cooler stops the charging operation. In addition to transmitting fault information and stopping charging, the indicator light can also be controlled to light up red to remind maintenance personnel. Maintenance personnel can use the screen or host computer to view the specific fault, which is convenient for troubleshooting and rectification.

[0121] If the self-test passes, the charging controller uses the communication line to interact with the liquid cooler to exchange system status, fault status word, oil pump, fan speed, charging gun temperature and other data. At the same time, the charging controller casts the first switch S1 to the PWM output, so that the PWM signal is output to the hard line. After the liquid cooler detects the PWM signal, it closes the second switch S2 to make the entire hard line loop conductive. The charging controller uses the hard line to interact with the liquid cooler on both sides of the fault status and charging gun temperature (such as gun head temperature). Specifically, when transmitting the charging gun temperature, the hard line PWM output duty cycle is used to transmit the charging gun temperature to the liquid cooler. The liquid cooler automatically adjusts the oil pump speed and fan speed according to the temperature to control the gun line temperature within the normal working range. In addition, the fault information of both parties is transmitted by not transmitting hard line signals or transmitting fixed voltage values.

[0122] It should be noted that the fault status word transmitted by the communication line can accurately display the specific fault, such as the liquid level is too high, and the hard line interaction can only indicate whether it is normal or faulty. For example, a liquid cooler fault will be indicated on both the communication line and the hard line. The communication line will transmit the specific fault, such as the liquid level is too high, and the hard line will only transmit the fault without displaying the specific fault. After the charging controller receives the communication line and hard line data, when judging whether a liquid cooler fault occurs, the following steps can be performed: the charging controller receives the liquid cooler communication data (such as a data message) through the communication line, and judges whether the "system status" in the communication data is normal or faulty, and can judge whether the liquid cooler is faulty. Alternatively, the charging controller collects the voltage value of the hard line feedback signal through the hard line or judges whether the hard line signal is not received to determine whether the liquid cooler is faulty. In this embodiment, the simultaneous transmission of fault data by dual links can ensure that after one of the links is abnormal, the other link is used to transmit the fault information, thereby ensuring the timeliness of data transmission of charging control.

[0123] During the communication process, if the charging controller fails to receive the communication message sent by the liquid cooler after more than 10 seconds, it is determined that the communication line is faulty, and the charging controller reports a liquid cooler communication timeout alarm. The system is in an alarm state and can continue to work.

[0124] At the same time, the charging controller collects voltage through the hard line to determine whether the collected voltage is abnormal. If it is abnormal, it is determined that the liquid cooler is faulty. In the faulty state, the charging controller switches the first switch S1 to the power output terminal, the PWM signal stops outputting, the indicator light turns red, and stops working. Alternatively, the first switch S1 is directly disconnected. If the voltage collected on the hard line is not abnormal, it means that the liquid cooler is in normal condition, charging is normal, the indicator light turns green, and the above steps are repeated. In addition, the other party's fault can also be determined by not receiving a hard signal. At this time, the above corresponding steps are executed.

[0125] In this embodiment, the charging controller transmits data simultaneously through the communication line and the hard line, and improves the charging stability under the guarantee of dual communication. In the case of charging failure, when the communication line is used to transmit the fault information, after transmitting a packet of data, the other end needs to receive the complete data before the parsing operation can be performed. This process generally takes seconds, and the next data transmission requires a communication interval, so that it takes about 10 seconds to transmit the fault information through the communication line. The hard line signal using the PWM communication method is continuous, and the ADC (Analog-to-Digital Converter) acquisition of the PWM signal can achieve ms-level sampling, and the voltage is calculated using the sampling results, so as to determine whether the equipment, such as the charging controller or the liquid cooler, has a fault, respond to the fault in time, and perform a shutdown operation. Compared with the communication line transmission method, the transmission of fault information through the hard line PWM method can achieve ms-level protection, realize rapid fault isolation, and ensure charging safety.

[0126] In addition, in the event of a communication line failure, hard-wired communication can operate independently to quickly identify and isolate the fault, avoiding the problem of losses to users caused by the inability to transmit the fault in a timely manner due to a communication line failure, and improving the reliability and safety of charging.

[0127] In another implementation of the present application, a charging controller is provided, and the charging controller is used to execute the above-mentioned communication method.

[0128] In another implementation of the present application, a communication system is provided, including a liquid cooler and the above-mentioned charging controller, wherein the liquid cooler is used to perform a heat dissipation operation of the charging gun corresponding to the first communication data.

[0129] In one implementation, the charging controller is provided with a power output terminal, a PWM output terminal and a first switch; the liquid cooler is provided with a second switch. One end of the first switch is used to connect to the power output terminal or the PWM output terminal, the other end of the first switch is connected to one end of the hard line, the other end of the hard line is connected to one end of the second switch, and the other end of the second switch is used for grounding. When the first switch is connected to the PWM output terminal and the second switch is closed, the hard line communication loop is turned on.

[0130] More specifically, the charging controller is provided with a power output terminal and a PWM output terminal, a first switch and a first resistor; the liquid cooler is provided with a second resistor and a second switch;

[0131] One end of the first switch can be connected to the power supply output end or the PWM output end; the other end of the first switch is connected to the first resistor, the first resistor is connected to one end of the hard line, the other end of the hard line is connected to the second resistor, the second resistor is connected to one end of the second switch, and the other end of the second switch can be grounded;

[0132] When the first switch is connected to the PWM output terminal and the second switch is closed, the hard-wire communication loop is turned on.

[0133] In one implementation, the liquid cooler performs a charging gun heat dissipation operation corresponding to the first communication data, including:

[0134] At least one of starting a cooling pump and adjusting a fan speed is performed based on the first communication data.

[0135] In one implementation, the liquid cooler is also used for:

[0136] If a liquid cooler failure is detected, the second switch is opened to transmit a hard line feedback signal to the charge controller through the hard line.

[0137] For the operation process of the liquid cooler and the charging controller in this embodiment, please refer to the corresponding description above.

[0138] In this application, a hard wire and a communication line for data transmission are connected between the charging controller and the liquid cooler, and the communication transmission between the charging controller and the liquid cooler can be realized through the hard wire and the communication line, realizing dual communication guarantee, enhancing the reliability and security of the communication between the two, and improving the communication redundancy capability. In addition, in this application, the hard wire transmission efficiency is relatively high, which improves the communication transmission efficiency, and can timely transmit the fault information when the charging controller or the liquid cooler fails, realizing timely response operation of the fault, and improving the efficiency and timeliness of fault handling.

[0139] Another embodiment of the present application provides a charging pile, including the above-mentioned communication system, and also including a charging gun; the charging gun is connected to the liquid cooler through a liquid cooling gun line, and the specific structure diagram is shown in FIG. Figure 2 shown.

[0140] In one implementation, the charging pile further includes a power output module, and the charging controller outputs charging power to the liquid cooler through the power output module.

[0141] In this application, a hard wire and a communication line for data transmission are connected between the charging controller and the liquid cooler, and the communication transmission between the charging controller and the liquid cooler can be realized through the hard wire and the communication line, realizing dual communication guarantee, enhancing the reliability and security of the communication between the two, and improving the communication redundancy capability. In addition, in this application, the hard wire transmission efficiency is relatively high, which improves the communication transmission efficiency, and can timely transmit the fault information when the charging controller or the liquid cooler fails, realizing timely response operation of the fault, and improving the efficiency and timeliness of fault handling.

[0142] An embodiment of the present application also provides a computer program product including computer-readable instructions. When the computer-readable instructions are executed on an electronic device, the electronic device implements any one of the communication methods provided in the embodiments of the present application.

[0143] A computer-readable storage medium is also provided in an embodiment of the present application. The storage medium carries one or more computer programs. When the one or more computer programs are executed by an electronic device, the electronic device can implement any communication method provided in the embodiment of the present application.

[0144] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A communication method, characterized in that: Applied to a charging controller, wherein a hard line and a communication line for data transmission are connected between the charging controller and the liquid cooler, and the communication method includes: When it is determined that the charging pile self-test has passed, the first communication data is transmitted to the liquid cooler through the communication line, and the hard-wire communication signal corresponding to the first communication data is transmitted to the liquid cooler through the hard wire, so that the liquid cooler performs the charging gun heat dissipation operation corresponding to the first communication data.

2. The communication method according to claim 1, characterized in that: After determining that the charging pile self-test has passed, and before transmitting the hard-wire communication signal corresponding to the first communication data to the liquid cooler through the hard wire, the method further includes: The first switch provided inside the charging controller is controlled to be closed so that the pulse width modulation (PWM) output end inside the charging controller is connected to the hard wire. The hard wire connection signal output by the PWM output end is output to the liquid cooler through the hard wire. When the liquid cooler receives the hard wire connection signal, the second switch inside the liquid cooler is closed to realize the conduction of the hard wire communication loop.

3. The communication method according to claim 2, characterized in that: One end of the first switch is used to connect to the power supply output end or the PWM output end, and the other end of the first switch is connected to one end of the hard line.

4. The communication method according to claim 1, characterized in that: The first communication data includes the charging gun temperature. Before the hard-line communication signal corresponding to the first communication data is transmitted to the liquid cooler through the hard line, the method further includes: Determine the PWM duty cycle corresponding to the temperature of the charging gun; A PWM signal corresponding to the PWM duty cycle is generated, wherein the PWM signal is a hard-line communication signal corresponding to the temperature of the charging gun.

5. The communication method according to claim 2 or 3, characterized in that: After controlling the first switch provided in the charging controller to close, the method further includes: If a fault is detected in the charging gun or the charging controller, the first switch is connected to the power output terminal to transmit a fixed voltage value to the liquid cooler, or the first switch is disconnected.

6. The communication method according to claim 2 or 3, characterized in that: After transmitting the first communication data to the liquid cooler through the communication line, and transmitting the hard-line communication signal corresponding to the first communication data to the liquid cooler through the hard line, the method further includes: When receiving the second communication data transmitted by the liquid cooler, if the second communication data includes a preset fault identifier, connecting the first switch to the power output terminal, or disconnecting the first switch; Alternatively, when a hard-line feedback signal transmitted by the liquid cooler is received, if the liquid cooler is determined to be faulty based on the hard-line feedback signal, the first switch is connected to the power supply output terminal, or the first switch is disconnected, wherein the hard-line feedback signal is used to indicate the fault condition of the liquid cooler.

7. The communication method according to claim 6, characterized in that: Determining the liquid cooler failure according to the hard-line feedback signal includes: When the voltage value in the hard-line feedback signal is not within a preset voltage range, it is determined that the liquid cooler is faulty.

8. The communication method according to claim 1, characterized in that: After transmitting the first communication data to the liquid cooling machine through the communication line, the method further includes: When the second communication data transmitted by the liquid cooler through the communication line is not received within a preset time, an alarm message is output, where the alarm message is used to indicate that the communication line of the liquid cooler has timed out.

9. A charging controller, characterized in that: The charging controller is used to execute the communication method as described in any one of claims 1 to 8.

10. A communication system, characterized in that: comprising a liquid cooler and a charge controller as claimed in claim 9; The liquid cooler is used to perform a heat dissipation operation of the charging gun corresponding to the first communication data.

11. The communication system according to claim 10, characterized in that: The charging controller is provided with a power output terminal, a PWM output terminal and a first switch; the liquid cooler is provided with a second switch; One end of the first switch is used to connect the power supply output end or the PWM output end; The other end of the first switch is connected to one end of the hard line, the other end of the hard line is connected to one end of the second switch, and the other end of the second switch is grounded; When the first switch is connected to the PWM output terminal and the second switch is closed, the hard-wire communication loop is turned on.

12. The communication system according to claim 10, characterized in that: The liquid cooler performs a charging gun heat dissipation operation corresponding to the first communication data, including: At least one of starting a cooling pump and adjusting a fan speed is performed based on the first communication data.

13. The communication system according to claim 10, characterized in that: The liquid cooler is also used for: If a liquid cooler failure is detected, the second switch is opened to transmit a hard line feedback signal to the charge controller through the hard line.

14. A charging pile, characterized in that: It includes the communication system as described in claim 10, and also includes a charging gun; the charging gun is connected to the liquid cooler through a liquid cooling gun line.

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