EVCC charging protection method, device and system and electric vehicle

Abstract

The invention relates to the technical field of electric automobiles, and discloses an EVCC charging protection method, device and system and an electric automobile. The method comprises the steps that in the whole automobile power-off state, if an EVCC receives a charging wake-up signal, an A + signal is generated to enter a wake-up period; in the wake-up period, continuously outputting the A + signal and stopping outputting after a first preset time so as to enter a waiting stage of a second preset time, and in the waiting stage, obtaining a storage battery power supply signal of the electric vehicle; if the storage battery power supply signal meets the preset condition, continuous output of the A + signal is recovered, and if the storage battery power supply signal does not meet the preset condition, the wake-up period is entered again, and output of the A + signal is forbidden until the total number of times of entering the wake-up period reaches the preset number of times. The voltage condition of the storage battery is associated in the process that the EVCC awakens the charging related module, the breakdown risk of an A + signal loop can be effectively avoided, and the charging reliability and the user charging experience in the whole vehicle power-off state are greatly improved.

Description

Technical Field

[0001] This application relates to the field of electric vehicle technology, and in particular to an EVCC charging protection method, device, system, and electric vehicle. Background Technology

[0002] In electric vehicle charging systems, the Electric Vehicle Communication Controller (EVCC) is used to convert the communication protocol between the vehicle and the charging station. It uses the A+ signal to wake up the vehicle's BMS, VCU, MCU and other control systems to realize the charging function.

[0003] However, electric vehicles often experience battery depletion after long-term parking or sea transport. When users plug in the charger when the battery is depleted, the relevant circuit of the A+ signal is easily subjected to a large current surge for an extended period and may break down. This can cause the vehicle to mistakenly identify itself as being in a charging state and prohibit it from engaging gears and driving, which not only seriously affects the user experience but also increases the risk of breakdowns. Summary of the Invention

[0004] This application provides an EVCC charging protection method, device, system, and electric vehicle, which solves the technical problem that when an electric vehicle is charged while the vehicle is powered off, the EVCC is prone to continuously outputting an A+ signal due to battery depletion, causing A+ circuit breakdown and seriously affecting the user experience. By associating the battery voltage status during the process of waking up the charging-related modules of the EVCC, the risk of A+ signal circuit breakdown can be effectively avoided, greatly improving the charging reliability and user charging experience when the vehicle is powered off.

[0005] To achieve the above objectives, the main technical solutions adopted in this application include: In a first aspect, this application provides an EVCC charging protection method, the method comprising: When the vehicle is powered off, if the EVCC receives a charging wake-up signal, it generates an A+ signal to enter the wake-up cycle. During the wake-up cycle, the A+ signal is continuously output and the output stops after a first preset time to enter a waiting phase of a second preset time, and the battery power supply signal of the electric vehicle is acquired during the waiting phase. If the battery power supply signal meets the preset conditions, the A+ signal will be continuously output. If the battery power supply signal does not meet the preset conditions, the wake-up cycle will be re-entered until the total number of times the wake-up cycle is entered reaches the preset number, at which point the A+ signal output will be prohibited.

[0006] The EVCC charging protection method proposed in this application initiates a wake-up cycle after receiving a charging wake-up signal when the vehicle is powered off, and correlates the battery voltage status in each wake-up cycle to achieve precise control of the A+ signal output. Because the EVCC only outputs the A+ signal briefly during the wake-up cycle when the vehicle is powered off, and continuously monitors the battery power supply signal to ensure it meets preset conditions during the waiting phase, compared to related technologies, this effectively avoids prolonged continuous output of the A+ signal when the battery is depleted. This significantly reduces the risk of A+ signal circuit breakdown, effectively ensuring the stable operation of the charging system when the vehicle is powered off, and preventing the vehicle from misjudging its charging status and becoming inoperable due to circuit breakdown, thus significantly optimizing the user's charging experience.

[0007] Optionally, the charging wake-up signal is determined based on the charging gun signal when the electric vehicle is powered off; or The charging wake-up signal is determined based on the scheduled charging signal of the electric vehicle when the vehicle is powered off.

[0008] This application uses the plug-in signal or scheduled charging signal when the vehicle is powered off as the charging wake-up signal, which can adapt to different charging application scenarios such as plug-in charging and scheduled charging. This enables electric vehicles to accurately start the charging wake-up process when plugging in the plug or when the scheduled charging time is reached, thus improving the scenario compatibility of the charging system when the vehicle is powered off.

[0009] Optionally, the first preset time is determined in the following way: A real-vehicle test was conducted on the electric vehicle while it continuously output the A+ signal, and the maximum time threshold for the continuous output of the A+ signal was determined based on the test results, so as to determine the first preset time based on the maximum time threshold.

[0010] This application determines the appropriate continuous output time of the A+ signal within the wake-up cycle through real-vehicle testing of electric vehicles. This ensures that the first preset time meets the wake-up requirements of charging-related modules while avoiding signal circuit breakdown due to excessive output time, providing a precise basis for controlling the output duration of the A+ signal.

[0011] Optionally, the preset condition is that the battery is online and the voltage of the battery power supply signal is greater than a preset threshold. The battery power supply signal is determined based on the battery voltage message sent by the vehicle control unit (VCU), and the battery is determined to be online if the battery voltage message is valid.

[0012] This application determines whether the battery is online by sending a battery voltage message from the vehicle controller. Then, under the premise that the battery is online, the application determines that the battery is not in a depleted state only when the voltage of the battery power supply signal is greater than a preset threshold. This can effectively avoid EVCC misjudgment caused by the battery being unable to supply power stably but the voltage of the battery power supply signal has not completely dropped, and further improves the reliability of EVCC charging control.

[0013] Optionally, the first preset time is 1 second and the second preset time is 3 seconds.

[0014] Optionally, the preset number of times is 2.

[0015] Optionally, after disabling the A+ signal output, the method further includes: determining that the electric vehicle is in a low-power fault condition and generating a low-power alarm message.

[0016] After determining that the vehicle is in a low battery condition, this application promptly generates a low battery alarm message to inform the user that the vehicle cannot be charged due to a low battery fault, thereby optimizing the user's charging experience and improving the efficiency of fault diagnosis.

[0017] Secondly, this application provides an EVCC charging protection device, the device comprising: The trigger module is used to generate an A+ signal to enter the wake-up cycle when the EVCC receives a charging wake-up signal while the vehicle is powered off. The wake-up module is used to continuously output the A+ signal during the wake-up cycle and stop outputting after a first preset time to enter a waiting phase of a second preset time, and to acquire the battery power supply signal of the electric vehicle during the waiting phase. The protection module is used to restore the continuous output of the A+ signal if the battery power supply signal meets the preset conditions, and to re-enter the wake-up cycle if the battery power supply signal does not meet the preset conditions, until the total number of times the wake-up cycle is entered reaches the preset number, after which the output of the A+ signal is prohibited.

[0018] The EVCC charging protection device proposed in this application initiates a wake-up cycle after receiving a charging wake-up signal when the vehicle is powered off via a trigger module. The wake-up module and protection module correlate the battery voltage status in each wake-up cycle to achieve precise control of the A+ signal output. Because the EVCC only outputs the A+ signal briefly during the wake-up cycle when the vehicle is powered off, and continuously monitors the battery power supply signal to ensure it meets preset conditions during the waiting phase, compared to related technologies, this effectively avoids prolonged continuous output of the A+ signal when the battery is depleted. This significantly reduces the risk of A+ signal circuit breakdown, effectively ensuring the stable operation of the charging system when the vehicle is powered off, and preventing the vehicle from misjudging its charging status and becoming inoperable due to circuit breakdown. This significantly optimizes the user's charging experience.

[0019] Thirdly, this application provides a charging system, comprising: EVCC; And the aforementioned EVCC charging protection device.

[0020] Fourthly, this application provides an electric vehicle that includes the charging system described above. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the vehicle interaction of EVCC in related technologies; Figure 2 This is one of the flowcharts illustrating an EVCC charging protection method provided in this application embodiment; Figure 3 A second schematic flowchart illustrating an EVCC charging protection method provided in this application embodiment; Figure 4 This is a schematic diagram of the structure of an EVCC charging protection device provided in an embodiment of this application. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] Figure 1 The diagram illustrates the vehicle interaction of the EVCC in related technologies. When the vehicle is powered off, if the user plugs in the charger to start charging, the CP lead of the charger will generate a CP signal. Upon receiving the CP signal, the EVCC will continuously output a 12V A+ signal to wake up various charging-related modules, such as the Vehicle Control Unit (VCU), Microcontroller Unit (MCU), and Battery Management System (BMS). If the VCU, MCU, and BMS are successfully woken up, the VCU and MCU exchange charging commands via the vehicle CAN bus, the MCU and the On-Board Charger (OBC) exchange charging power and charging mode parameters via the vehicle CAN bus, and the OBC and BMS monitor battery status via the vehicle CAN bus.

[0025] However, electric vehicles are prone to battery depletion during long-term parking and sea transport. If a user starts charging while the battery is depleted, the battery cannot output a 12V power supply signal. This causes a power competition between the EVCC's A+ signal and the battery, meaning the electric vehicle relies on the A+ signal to supply power to the low-voltage system. This results in the A+ signal circuit carrying a large load current for an extended period, which can damage the diodes in the A+ signal circuit, making it highly susceptible to breakdown. Once the A+ signal circuit breaks down, the A+ signal will continue to be output, causing the vehicle to mistakenly identify a continuous charging connection. This will disable the vehicle's drive system, preventing the electric vehicle from engaging gears and driving. This not only severely impacts the user experience but also increases the risk of breakdowns and vehicle repair costs.

[0026] Therefore, there is an urgent need for an EVCC charging protection solution that can accurately avoid the risk of A+ signal circuit breakdown under battery depletion conditions.

[0027] According to an embodiment of this application, an EVCC charging protection method is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Also, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0028] This embodiment provides an EVCC charging protection method. Figure 2 This is a flowchart of an EVCC charging protection method according to an embodiment of this application, such as... Figure 2 As shown, the process includes the following steps: Step S1: When the vehicle is powered off, if the EVCC receives a charging wake-up signal, it generates an A+ signal to enter the wake-up cycle.

[0029] Specifically, the vehicle's power-off state refers to the electric vehicle's ignition switch being in the OFF position, and modules such as VCU, MCU, OBC, and BMS all being in sleep mode. The charging wake-up signal, serving as the trigger signal for the EVCC charging protection method provided in this application embodiment, originates from at least the plug-in signal detected by the electric vehicle and the electric vehicle's scheduled charging signal. The plug-in signal refers to the level signal generated by the charging socket's CP lead after the user inserts the charging gun into the charging socket. The scheduled charging signal refers to the scheduled charging signal issued by the cabin terminal, i.e., the user's pre-set charging start command. This scheduled charging signal will drive the CP lead to generate a valid level signal at the corresponding scheduled charging time to trigger the charging process. Upon receiving any type of charging wake-up signal, the EVCC immediately activates its internal signal output module to generate a 12V A+ signal. The A+ signal is a 12V low-voltage wake-up signal output by the EVCC, a control signal used to activate the vehicle's charging-related controllers in the charging scenario. This A+ signal is output through the EVCC's A+ lead.

[0030] Step S3: During the wake-up cycle, continuously output the A+ signal and stop outputting after the first preset time to enter the waiting stage of the second preset time, and obtain the battery power supply signal of the electric vehicle during the waiting stage.

[0031] Specifically, the first preset time is related to the critical continuous output duration at which the A+ signal circuit breaks down. It represents the safe duration for which the A+ signal can be continuously output when the battery is depleted. This satisfies the basic wake-up requirements of the charging-related controllers and avoids overload of the circuit current caused by excessively long single output time of the A+ signal.

[0032] Because the vehicle typically experiences a certain delay before the VCU sends a monitoring signal for battery power supply when the charging gun is plugged in or the scheduled charging time is reached (i.e., when the CP lead generates a level signal), the A+ signal circuit is shut off after a first preset time of continuous output, thus ceasing the output of the A+ signal. A second preset time waiting phase is then set. During this waiting phase, the EVCC continuously acquires the battery power supply signal, providing data support for subsequent determination of whether the battery is low on charge.

[0033] The battery power supply signal represents the output voltage of the battery. The battery's normal operating voltage is 12V. If the battery is in a depleted state, the voltage will drop to less than 12V.

[0034] Step S5: If the battery power supply signal meets the preset conditions, the A+ signal will continue to be output. If the battery power supply signal does not meet the preset conditions, the wake-up cycle will be restarted until the total number of wake-up cycles reaches the preset number, at which point the A+ signal output will be disabled.

[0035] Specifically, this embodiment avoids power competition issues caused by a depleted battery by associating and determining the battery power supply signal. First, preset conditions are set for determining whether the battery is depleted. These preset conditions must ensure that the battery is online and has a certain power supply capacity to avoid misjudgments caused by relying solely on the detected voltage value. It can be understood that the total number of times the wake-up cycle is entered refers to the cumulative number of times the EVCC actively initiates the wake-up cycle from the first receipt of the charging wake-up signal and the generation of the A+ signal until the final determination of whether to prohibit the A+ signal output.

[0036] During the current wake-up cycle, when the battery power supply signal meets the preset conditions, it indicates that the battery is not currently undercharged and can normally provide 12V power to the low-voltage system. At this time, the A+ signal is continuously output. That is, once the battery power supply signal is detected to meet the preset conditions during the waiting phase, the output of the A+ signal is immediately restarted and will not be actively shut off thereafter. In other words, it will not continue into subsequent wake-up cycles, thus entering the standard charging process.

[0037] If the battery power supply signal fails to meet the preset conditions until the end of the current wake-up cycle, it indicates that the battery may be unable to supply power normally. After the current wake-up cycle ends, the next wake-up cycle will begin, repeating step S3 above. When the number of wake-up cycles reaches a preset number (i.e., the number of repetitions of step S3 has reached its limit), if the battery power supply signal still fails to meet the preset conditions during this period, the battery is determined to be in a low-charge state. At this time, the A+ signal output is disabled, i.e., the A+ signal circuit is completely shut down, thus avoiding the problem of continuous A+ signal output and power supply contention caused by the battery being in a low-charge state.

[0038] The EVCC charging protection method provided in this application starts a wake-up cycle after receiving a charging wake-up signal when the vehicle is powered off, and associates the battery voltage status with the wake-up cycle to achieve precise control of the A+ signal output. Since the EVCC only outputs the A+ signal briefly during the wake-up cycle when the vehicle is powered off, and continuously monitors whether the battery power supply signal meets preset conditions during the waiting phase, compared with related technologies, it effectively avoids the prolonged continuous output of the A+ signal when the battery is low on power, greatly reducing the risk of A+ signal circuit breakdown. This effectively ensures the stable operation of the charging system when the vehicle is powered off and avoids the problem of the vehicle being unable to drive due to misjudging the charging status caused by circuit breakdown, significantly optimizing the user's charging experience.

[0039] In one example of an embodiment of this application, the charging wake-up signal is determined based on the charging gun signal when the electric vehicle is powered off.

[0040] Specifically, the charging gun insertion signal is an instantaneous wake-up source generated by a change in the electrical connection state of the charging interface. When the ignition switch of the electric vehicle is in the OFF position, if the user needs to charge, they will insert the charging gun into the charging socket. After the charging gun is inserted, the charging socket immediately drives a voltage jump on the CP lead, thereby generating a charging gun insertion signal and sending it to the EVCC, thus waking up the EVCC. Subsequently, the EVCC responds to this signal by opening the A+ signal loop, thereby generating the A+ signal to wake up the VCU, MCU, and BMS.

[0041] In another example of the embodiments of this application, the charging wake-up signal is determined based on the scheduled charging signal of the electric vehicle when the vehicle is powered off.

[0042] Specifically, the scheduled charging signal is a delayed wake-up source issued by in-vehicle infotainment (IVI) terminals, vehicle central control devices, or mobile terminals. When the ignition switch of the electric vehicle is in the OFF position, if the user inserts the charging gun into the charging socket and has set a scheduled charging time through the in-vehicle terminal or other devices, the charging socket will drive a voltage jump on the CP lead when the preset charging time is reached, thereby generating a scheduled charging signal. This signal is then sent to the EVCC to wake up the EVCC. Subsequently, the EVCC responds to this scheduled charging signal by opening the A+ signal circuit, generating an A+ signal to wake up the VCU, MCU, and BMS, ensuring that the vehicle automatically starts the charging process at the scheduled time.

[0043] This application embodiment uses the plug-in signal or scheduled charging signal when the vehicle is powered off as the charging wake-up signal, which can adapt to different charging application scenarios such as plug-in charging and scheduled charging. This enables electric vehicles to accurately start the charging wake-up process when plugging in the plug or when the scheduled charging time is reached, thus improving the scenario compatibility of the charging system when the vehicle is powered off.

[0044] It is understandable that when the vehicle is powered off, regardless of whether the charging wake-up signal comes from the plug-in signal or the scheduled charging signal, the EVCC will initiate the same A+ signal output timing control process, namely steps S1 to S5 above.

[0045] In some embodiments of this application, the first preset time is determined by: conducting a real vehicle test on the electric vehicle while it continuously outputs the A+ signal, and determining the maximum time threshold for continuous output of the A+ signal based on the test results, so as to determine the first preset time based on the maximum time threshold.

[0046] Specifically, after the EVCC initiates the wake-up process when the vehicle is powered off, it sets a first preset time based on the maximum time threshold for which power semiconductor devices such as diodes in the A+ signal circuit will break down due to continuously carrying a large load current. In this embodiment, the maximum time threshold is calibrated through real-vehicle testing. For example, when the ignition switch of the electric vehicle is in the OFF position, the EVCC forces the A+ pin to maintain a constant 12V DC voltage output while simultaneously monitoring the electrical parameters of key nodes in the A+ signal circuit. This calibrates the output duration corresponding to the A+ signal circuit breakdown, which is the critical continuous output duration for A+ signal circuit breakdown. To ensure circuit safety, a safety redundancy is reserved based on this critical continuous output duration, and the final determined first preset time is less than this critical continuous output duration. If multiple real-vehicle tests determine that the risk of A+ signal circuit breakdown increases significantly after the continuous output time exceeds 1 second, the first preset time can be set to 1 second.

[0047] This application embodiment determines the appropriate continuous output time of the A+ signal within the wake-up cycle through real-vehicle tests of electric vehicles. This ensures that the first preset time not only meets the wake-up requirements of the charging-related modules but also avoids signal circuit breakdown caused by excessive output time, providing a precise basis for controlling the output duration of the A+ signal.

[0048] In some embodiments of this application, the aforementioned preset conditions are that the battery is online and the voltage of the battery power supply signal is greater than a preset threshold. The battery power supply signal is determined based on a battery voltage message sent by the VCU, and the battery is determined to be online if the battery voltage message is valid.

[0049] Specifically, when the battery is offline, due to the hysteresis of the components, the battery's output voltage may not have fully dropped. In this case, if the EVCC only relies on the voltage of the battery's power supply signal to determine whether the battery is low on power, it is very likely to make a misjudgment. That is, the voltage of the battery's power supply signal is greater than 12V, but in fact the battery is offline and cannot supply power normally. The EVCC will mistakenly determine that the battery has normal power supply capability and control the A+ signal to continue to output, which will lead to a power supply competition problem.

[0050] Therefore, the preset conditions in this application embodiment require both that the battery be online and that the battery power supply signal voltage be greater than 12V. It is understood that the battery being online means that the CAN communication link between the battery and the VCU is normal, thus ensuring the normal transmission of battery voltage messages and achieving effective monitoring of the battery power supply capability.

[0051] The battery voltage message refers to the CAN message generated and sent by the VCU based on the battery status information reported by the BMS. The EVCC determines whether the battery is online and monitors the voltage of the battery power supply signal by parsing the battery voltage message.

[0052] This application determines whether the battery is online by sending a battery voltage message from the vehicle controller. Then, under the premise that the battery is online, the application determines that the battery is not in a depleted state only when the voltage of the battery power supply signal is greater than a preset threshold. This can effectively avoid EVCC misjudgment caused by the battery being unable to supply power stably but the voltage of the battery power supply signal has not completely dropped, and further improves the reliability of EVCC charging control.

[0053] In some embodiments of this application, the first preset time can be set to 1 second and the second preset time to 3 seconds.

[0054] Specifically, as described above, actual vehicle testing and calibration revealed that the risk of A+ signal circuit breakdown increases significantly after the continuous output time of the A+ signal exceeds 1 second. Therefore, this embodiment of the application can be configured to control the continuous output of the A+ signal for 1 second within each wake-up cycle before actively shutting off the A+ signal. The second preset time refers to the waiting time set by the EVCC after actively shutting off the A+ signal. Since the VCU typically requires a delay of more than 1.5 seconds to wake up and send a battery voltage message when the vehicle is powered off, and the charging gun is plugged in or the scheduled charging time is reached, this delay time is related to the state of the electric vehicle. Actual vehicle testing and calibration showed that this delay time is generally between 1.5 and 4 seconds. Therefore, this embodiment of the application sets the second preset time to 3 seconds, that is, after shutting off the A+ signal within each wake-up cycle, a 3-second wait is required to monitor the battery power supply signal during the waiting period.

[0055] In some embodiments of this application, the preset number of attempts can be set to 2. Specifically, when the EVCC cannot enter the charging process normally due to the battery power supply signal not meeting the preset conditions while the vehicle is powered off, the maximum allowed total number of retries is 2. This can prevent misjudgments caused by occasional factors such as instantaneous communication delays and external environmental interference, providing two opportunities to judge the battery status, while avoiding excessive repetition of A+ signal output, reducing the risk of A+ signal circuit breakdown. In other words, setting the preset number of attempts to 2 is a reasonable setting that balances ensuring wake-up robustness and avoiding the risk of hardware failure.

[0056] Figure 3 The following is a schematic diagram of the method flow of an embodiment of this application when the preset number of times is 2. The specific process for setting the preset number of times to 2, that is, entering a maximum of 2 wake-up cycles, will be described below.

[0057] First, after detecting the CP signal, the EVCC enters its first wake-up cycle, outputting an A+ signal and continuously outputting it for 1 second. When 1 second has elapsed, the A+ signal output is turned off, and the system waits for 3 seconds. If, during the waiting phase, a battery power supply signal greater than 12V is detected, the A+ signal is continuously output, and the charging process begins until charging is complete.

[0058] Otherwise, the EVCC enters a second wake-up cycle, outputting the A+ signal and continuously outputting it for 1 second. After 1 second, the A+ signal output is turned off again, and a 3-second waiting phase begins. If the battery power supply signal is detected to be greater than 12V during the waiting phase, the A+ signal is continuously output, and the charging process begins until charging is complete. If the battery power supply signal is still less than or equal to 12V, the A+ signal is disabled, indicating that the battery is in a low-charge fault condition.

[0059] Furthermore, in some embodiments of this application, after disabling the A+ signal output, the method further includes: determining that the electric vehicle is in a low-power fault condition and generating a low-power alarm message.

[0060] Specifically, if the EVCC enters a preset number of wake-up cycles and the battery power supply signal consistently fails to meet preset conditions, it determines that the battery is in a low-charge state. In this situation, if the A+ signal continues to be output, a power contention issue will occur, causing the system to constantly rely on the A+ signal for 12V power. This significantly increases the risk of A+ signal circuit breakdown, potentially leading to the electric vehicle breaking down. Therefore, the EVCC generates a low-charge alarm message at this time and reports it to terminals such as the VCU via the vehicle's CAN bus.

[0061] In this embodiment of the application, after determining that the vehicle is in a low battery fault condition, a low battery alarm message is generated in a timely manner to remind the user that the vehicle cannot be charged due to a low battery fault, thereby optimizing the user's charging interaction experience and improving the efficiency of fault diagnosis.

[0062] Accordingly, please refer to Figure 4 This application provides an EVCC charging protection device, which includes: The trigger module 100 is used to generate an A+ signal to enter the wake-up cycle when the EVCC receives a charging wake-up signal while the vehicle is powered off. For details, please refer to step S1 above.

[0063] The wake-up module 200 is used to continuously output the A+ signal during the wake-up cycle and stop outputting after a first preset time to enter a waiting phase of a second preset time. During the waiting phase, it acquires the battery power supply signal of the electric vehicle. For details, please refer to step S3 above.

[0064] The protection module 300 is used to restore the continuous output of the A+ signal if the battery power supply signal meets the preset conditions, and to re-enter the wake-up cycle if the battery power supply signal does not meet the preset conditions, until the total number of times the wake-up cycle is entered reaches the preset number, after which the output of the A+ signal is prohibited. For details, please refer to step S5 above.

[0065] In this embodiment, the EVCC charging protection device is presented in the form of a functional unit. Here, a unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and memory that execute one or more software or fixed programs, and / or other devices that can provide the above functions.

[0066] Accordingly, this application provides a charging system including an EVCC and the EVCC charging protection device described in the above embodiments.

[0067] Accordingly, this application provides an electric vehicle including the charging system described above.

[0068] Further functional descriptions of the above modules and units are the same as those in the corresponding embodiments described above, and will not be repeated here.

[0069] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and all such modifications and variations fall within the scope defined by the appended claims.

[0070] The systems, devices, modules, or units described in the above embodiments can be implemented by computer chips or physical entities, or by products with certain functions. A typical implementation device is a computer. Specifically, the computer can be, for example, a personal computer, a laptop computer, a tablet computer, or any combination of these devices.

[0071] For ease of description, the above devices are described separately by function as various units. Of course, in implementing this application, the functions of each unit can be implemented in one or more software and / or hardware.

[0072] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0073] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0074] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0075] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0076] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0077] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the apparatus embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0078] The above description is merely an embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the scope of the claims of this application.

[0079] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and all such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A method for protecting EVCC charging, characterized in that, The method includes: When the vehicle is powered off, if the EVCC receives a charging wake-up signal, it generates an A+ signal to enter the wake-up cycle. During the wake-up cycle, the A+ signal is continuously output and the output stops after a first preset time to enter a waiting phase of a second preset time, and the battery power supply signal of the electric vehicle is acquired during the waiting phase. If the battery power supply signal meets the preset conditions, the A+ signal will be continuously output. If the battery power supply signal does not meet the preset conditions, the wake-up cycle will be re-entered until the total number of times the wake-up cycle is entered reaches the preset number, at which point the A+ signal output will be prohibited.

2. The method according to claim 1, characterized in that, The charging wake-up signal is determined based on the charging port signal when the electric vehicle is powered off; or The charging wake-up signal is determined based on the scheduled charging signal of the electric vehicle when the vehicle is powered off.

3. The method according to claim 1, characterized in that, The first preset time is determined in the following way: A real-vehicle test was conducted on the electric vehicle while it continuously output the A+ signal, and the maximum time threshold for the continuous output of the A+ signal was determined based on the test results, so as to determine the first preset time based on the maximum time threshold.

4. The method according to claim 1, characterized in that, The preset condition is that the battery is online and the voltage of the battery power supply signal is greater than a preset threshold. The battery power supply signal is determined based on the battery voltage message sent by the vehicle controller, and the battery is determined to be online if the battery voltage message is valid.

5. The method according to claim 1, characterized in that, The first preset time is 1 second, and the second preset time is 3 seconds.

6. The method according to claim 1, characterized in that, The preset number of times is 2.

7. The method according to claim 1, characterized in that, After disabling the A+ signal output, the method further includes: determining that the electric vehicle is in a low-power fault condition and generating a low-power alarm message.

8. An EVCC charging protection device, characterized in that, The device includes: The trigger module is used to generate an A+ signal to enter the wake-up cycle when the EVCC receives a charging wake-up signal while the vehicle is powered off. The wake-up module is used to continuously output the A+ signal during the wake-up cycle and stop outputting after a first preset time to enter a waiting phase of a second preset time, and to acquire the battery power supply signal of the electric vehicle during the waiting phase. The protection module is used to restore the continuous output of the A+ signal if the battery power supply signal meets the preset conditions, and to re-enter the wake-up cycle if the battery power supply signal does not meet the preset conditions, until the total number of times the wake-up cycle is entered reaches the preset number, after which the output of the A+ signal is prohibited.

9. A charging system, characterized in that, The charging system includes: EVCC; And the EVCC charging protection device as described in claim 8.

10. An electric vehicle, characterized in that, The electric vehicle includes the charging system as described in claim 9.

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