Direct current charging control method

Abstract

The invention provides a direct current charging control method, and relates to the technical field of direct current charging. The direct-current charging control method provided by the invention can effectively solve the problems of poor safety, short battery life and the like in the direct-current charging process of a new energy automobile, and particularly, the charging process is accurately controlled, so that the battery is ensured to be charged in a safe range, the phenomena of over-high temperature and over-charging of the battery are avoided, and the charging safety of the new energy automobile is improved. The service life of the battery is prolonged, and the charging safety is improved; meanwhile, through reasonable logic control, the risk that the driver suddenly drives the vehicle to break the charging pile in the charging process is avoided, and the safety of the charging equipment and the vehicle is protected.

Description

Technical Field

[0001] The present invention relates to the field of direct current charging technology, and in particular to a direct current charging control method. Background Art

[0002] DC fast charging, a core technology for recharging electric vehicles, is profoundly transforming the travel experience. It efficiently converts AC power into DC power via DC charging stations, directly feeding it into the battery at a high power level, enabling rapid charging to 80% of its capacity in a short period of time. This technology has become a lifesaver for long-distance driving and is widely deployed in locations such as highway service areas and urban public parking lots, significantly alleviating users' range anxiety. Furthermore, DC fast charging is crucial for taxis and ride-hailing services. Its rapid charging capabilities significantly reduce wait times, improve operational efficiency, meet frequent charging demands, ensure continuous vehicle operation, and enhance the passenger experience, driving the widespread adoption of new energy vehicles in these sectors.

[0003] However, efficiency hides challenges. Improper DC charging control strategies can also lead to a host of problems. Because DC fast charging uses high currents, if the electronic control system fails to effectively manage the charging process, it can cause a sharp rise in battery temperature, accelerating battery aging and even posing safety risks. Furthermore, improper control strategies can cause a mismatch between the battery's surface voltage and internal voltage, leading to "false charge" and impacting vehicle range and battery life. Therefore, while enjoying the convenience of DC fast charging, a sound DC charging control method is necessary to address these issues.

[0004] Therefore, we make improvements to this and propose a DC charging control method. Summary of the Invention

[0005] The purpose of the present invention is to address the problems raised by the current background technology.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides a DC charging control method to improve the above-mentioned problem.

[0007] The specific application is as follows:

[0008] Including BBB.

[0009] As the preferred technical solution of this application, the DDD.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] In the scheme of this application:

[0012] A DC charging control method provided by the present application can effectively solve the problems of poor safety and short battery life in the DC charging process of new energy vehicles. Specifically, the present application ensures that the battery is charged within a safe range by precisely controlling the charging process, avoids excessive battery temperature and overcharging, thereby extending the battery life and improving charging safety. At the same time, the present application also avoids the risk of the driver suddenly driving the vehicle and disconnecting the charging pile during the charging process through reasonable logical control, thereby protecting the safety of the charging equipment and the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is the logical interaction timing diagram of each DC charging ECU provided in this application;

[0014] Figure 2 The DC charging flow chart for the vehicle in dormancy provided in this application;

[0015] Figure 3 The DC charging process for the vehicle provided for this application is already at high voltage. DETAILED DESCRIPTION

[0016] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0017] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions therein may be combined with each other.

[0018] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0019] Example 1, please refer to Figure 1 , including the following steps:

[0020] When the vehicle detects that the BMS (Battery Management System) has hard-wired to wake up the VCU (Vehicle Controller), a DC charging gun is plugged in, the BMS requests DC charging, and the vehicle speed is below a preset threshold, the VCU controls the vehicle to enter the high-voltage process and switches the high-voltage state to "the vehicle cannot be driven after high voltage is on". This step improves the safety and orderliness of the vehicle charging process. From a safety perspective, when the vehicle is in the dormant state, charging preparation is initiated through strict conditional judgment, which reduces the possibility of the vehicle directly entering the charging process due to abnormal conditions such as false triggering, thereby reducing potential safety hazards during the charging process. Switching the high-voltage state to "the vehicle cannot be driven after high voltage is on" can effectively prevent the vehicle from accidentally moving during the charging process due to various reasons (such as misoperation, system failure, etc.), avoiding serious safety accidents such as collision between the vehicle and the charging equipment and electric shock to people. From the perspective of orderliness, the standardized process enables the vehicle charging preparation work to be carried out in an orderly manner, reduces confusion and errors during the charging process, improves charging efficiency, and lays a good foundation for subsequent charging operations.

[0021] When the vehicle detects that the BMS hardwire wakes up the VCU, a DC charging gun is plugged in, the BMS requests DC charging, and the vehicle speed is lower than a preset threshold in the high-voltage state, the VCU controls the vehicle to maintain high voltage and switches the high-voltage state to "the vehicle cannot be driven after high voltage is on"; this operation further strengthens the safety and stability of the vehicle during the charging process; when the vehicle is already in the high-voltage state, it continues to maintain the high-voltage environment required for charging through strict condition judgment, avoiding damage to the battery and charging equipment due to unnecessary high-voltage fluctuations or interruptions; switching the high-voltage state to non-drivable continuously ensures the vehicle's static state during charging, prevents the vehicle from moving suddenly during charging, reduces the impact on the charging equipment and the vehicle's own electrical system, and extends the service life of the equipment; at the same time, the stable high-voltage state helps improve charging efficiency, ensures that the charging process can proceed according to the predetermined parameters and speed, and provides a more stable and efficient charging service for the battery;

[0022] After the DC charging cable is plugged in, regardless of whether charging is in progress, the high-voltage state is switched to "the vehicle cannot be driven after high voltage is applied." After the high-voltage state is switched, the VCU simultaneously sends a DC charging permission instruction, DC charging enable, maximum allowable DC charging voltage, and maximum allowable DC charging current to the BMS. Switching the high-voltage state to "non-driveable" eliminates the risk of the vehicle being driven due to user misoperation during charging, ensuring that the vehicle remains safely stationary regardless of whether charging begins immediately. Accurate charging parameters are sent to the BMS, allowing it to precisely control the charging process based on these parameters, avoiding abnormal conditions such as overcharging and overcurrent, and protecting battery safety and performance.

[0023] If the BMS reports that it is DC charging within the calibration time, the VCU continues to send the above instructions and parameters; otherwise, the VCU sends a command to the BMS to end DC charging and sets the maximum DC charging voltage and current to 0V and 0A. The calibration time is used to determine whether charging is proceeding normally, and abnormalities in the charging process can be discovered in a timely manner. If the BMS does not report that it is charging within the specified time, it indicates that there may be a fault or abnormality in the charging process. In this case, timely termination of charging and setting the voltage and current to zero can effectively avoid the battery from continuing to charge under abnormal conditions, prevent battery damage due to overcharging, abnormal charging, etc., and extend the battery life. At the same time, this intelligent management mechanism also reduces the need for manual intervention, improves the automation and efficiency of the charging process, and reduces labor costs and the possibility of human error.

[0024] During the charging process, if it is detected that BMS DC charging is completed, BMS charging fault, BMS total voltage reaches the calibration threshold, or BMS single cell voltage reaches the calibration threshold, the VCU sends a DC charging end instruction to the BMS and sets the maximum DC charging voltage and current to 0V and 0A; when charging is detected to be complete, timely termination of charging can avoid battery overcharging, which can cause battery heating, bulging, capacity reduction and other problems, seriously affecting the battery life and safety; when a charging fault is detected, the total voltage or single cell voltage reaches the calibration threshold, charging is quickly terminated and the voltage and current are cut off, which can prevent serious safety accidents such as explosion and fire due to battery fault or voltage abnormality; this multiple protection mechanism ensures that the battery can be effectively protected in various situations, improves the reliability and stability of the vehicle charging system, and reduces vehicle failures and safety hazards caused by charging problems.

[0025] Furthermore, the high-voltage state includes two states: "the vehicle cannot be driven after high voltage is applied" and "the vehicle can be driven after high voltage is applied", and after the DC charging gun is plugged in, the high-voltage state is switched to "the vehicle cannot be driven after high voltage is applied" regardless of whether charging is on; the high-voltage state of the vehicle is directly related to the driving and charging safety of the vehicle, and clear state classification and switching rules can avoid misoperation caused by state confusion; limiting vehicle driving during charging is to ensure the safety of the charging process and prevent vehicle movement from causing damage to the charging equipment and battery.

[0026] Furthermore, the maximum allowable DC charging voltage and current sent by the VCU to the BMS are determined based on safety calibration of different battery packs. Battery performance and lifespan are closely related to charging parameters, and different battery packs require different charging parameters to ensure their safety and performance. Determining charging parameters through safety calibration can meet the personalized needs of different battery packs and improve charging safety and efficiency.

[0027] Furthermore, after charging is completed, if there is no other hard-wired wake-up source, and the BMS hard-wired wake-up VCU wake-up source and the BMS request for DC charging are cleared, the vehicle enters the normal power-off process; otherwise, the vehicle remains in a high-voltage state; when there is no other wake-up source and the charging request is cleared, the vehicle enters the normal power-off process, which can avoid unnecessary energy consumption and extend the vehicle's cruising range. At the same time, it reduces the loss of the vehicle's electrical system when not in use, reduces the incidence of system failures, and extends the service life of the electrical system; when there are other wake-up sources or the charging request is not cleared, the vehicle remains in a high-voltage state, which can ensure that the vehicle can respond quickly when needed, meet user needs, and improve the convenience and flexibility of vehicle use.

[0028] Furthermore, if the vehicle remains in a high-voltage state after charging is completed, when the DC charging gun is unplugged, the high-voltage state switches to "the vehicle can be driven after high voltage is applied"; otherwise, the high-voltage state remains in "the vehicle cannot be driven after high voltage is applied"; when charging is completed and the charging gun is unplugged, the vehicle automatically switches to a drivable state, which is in line with the user's usage habits, allowing the user to start the vehicle quickly and conveniently without performing additional operations, saving time and energy; at the same time, the vehicle remains in a non-drivable state when the charging gun is not unplugged or in other circumstances, continuing to ensure the safety of the charging process and the vehicle's surrounding environment.

[0029] Example 2 further optimizes the DC charging control method provided in Example 1. Specifically, it also includes real-time monitoring of the battery temperature during the charging process. When the battery temperature exceeds a preset safety temperature threshold, the VCU automatically adjusts or interrupts the DC charging process to prevent safety hazards caused by battery overheating. The battery generates heat during the charging process. If the temperature is too high, it will not only affect the performance and life of the battery, but may also cause serious safety accidents such as combustion and explosion. By monitoring the battery temperature in real time, it is possible to promptly detect abnormal increases in battery temperature. When the temperature exceeds a preset safety temperature threshold, the VCU automatically adjusts or interrupts the DC charging process, which can quickly reduce the heating rate of the battery and prevent the battery from overheating. This not only protects the safety and performance of the battery itself and extends the battery life, but also avoids serious safety accidents such as vehicle fires caused by battery overheating, thereby ensuring the safety of life and property of vehicles and personnel.

[0030] Furthermore, the VCU sends a charging mode selection instruction to the BMS while sending the DC charging permission instruction and the DC charging enable instruction. The instruction includes but is not limited to fast charging mode, slow charging mode or balanced charging mode to adapt to different battery states and user needs. Different battery states and user needs have different requirements for charging speed and method. The fast charging mode can quickly replenish the battery in a short time, which is suitable for users who urgently need to use the car, thereby improving the user's usage efficiency. The slow charging mode charges at a lower charging speed, which can reduce the heat and loss of the battery, is beneficial to battery maintenance and prolongs the service life, and is suitable for use when the user has sufficient time. The balanced charging mode can evenly charge each single cell in the battery pack to ensure the consistency of the battery pack and improve the overall performance and service life of the battery pack.

[0031] Furthermore, the selection of the fast charging mode, slow charging mode or balanced charging mode is based on the battery's current state of charge (SOC), battery state of health (SOH) and the charging preference set by the user, and is automatically determined by the VCU according to a preset algorithm or manually selected by the user; considering the battery's state of charge and state of health, it can ensure that the selected charging mode is suitable for the actual situation of the battery, and avoid damage to the battery due to improper charging mode; for example, when the battery state of charge is low and the user urgently needs to use the car, selecting the fast charging mode can quickly replenish the battery; when the battery health is not good, selecting the slow charging mode or the balanced charging mode can better protect the battery; at the same time, allowing users to manually select the charging mode respects the user's personalized needs and improves the user's sense of participation and satisfaction; users can flexibly choose the charging mode that suits them according to their actual situation and needs, so that the vehicle's charging process is more in line with user expectations.

[0032] Furthermore, during the DC charging process, the VCU monitors the charging power in real time and compares it with the maximum allowable DC charging power. When the charging power exceeds the maximum allowable DC charging power, the VCU sends a charging power adjustment instruction to the BMS to reduce the charging power to within the allowable range. Excessive charging power may cause serious battery heating, overcharging and other problems, which will damage the performance and life of the battery and may also damage the charging equipment. By monitoring the charging power in real time and comparing it with the maximum allowable DC charging power, the VCU can promptly detect abnormal charging power. When the charging power exceeds the allowable range, a charging power adjustment instruction is sent to the BMS, which can quickly reduce the charging power and ensure that the charging process is carried out within a safe power range. This not only protects the safety of batteries and charging equipment and extends their service life, but also improves the stability and reliability of the charging process.

[0033] Furthermore, the VCU communicates with the vehicle's telematics unit, uploading the DC charging status and related data to the cloud platform in real time. Users can remotely view the vehicle's charging status, remaining charging time, charging power and other information through a mobile phone app, and can also remotely control the start and stop of charging;

[0034] The VCU uploads data to the cloud platform via the 4G / 5G network using the MQTT protocol for encryption. Users can view the charging progress and remaining time in real time through the APP and remotely execute emergency stop commands.

[0035] Example 3, as Figure 2 As shown in the figure, the DC charging process when the vehicle is dormant is:

[0036] If the vehicle detects that the BMS has hard-wired the VCU to wake up the vehicle while it is in sleep mode, a DC charging cable is plugged in, and the BMS requests DC charging, and the vehicle speed is below a certain threshold (determined for safety reasons, generally this threshold is considered to indicate that the vehicle has basically stopped), the VCU will control the vehicle to enter the high-voltage process. After high voltage is applied, the state will switch to "Do not drive the vehicle after high voltage is applied"; this is to prevent the driver from accidentally driving the vehicle and disconnecting the charging pile, causing property damage;

[0037] The high-voltage status includes "the vehicle cannot be driven after high voltage is applied" and "the vehicle can be driven after high voltage is applied". After the DC charging gun is plugged in, the high-voltage status will be switched to "the vehicle cannot be driven after high voltage is applied" regardless of whether charging is on. When the high-voltage status is switched to "the vehicle cannot be driven after high voltage is applied", the VCU simultaneously sends a DC charging permission instruction, a DC charging enable, the maximum allowable DC charging voltage (based on the safety calibration of different battery packs), and the maximum allowable DC charging current (based on the safety calibration of different battery packs) to the BMS. Among them, sending the DC charging permission instruction and DC charging enable to the BMS is to start DC charging, and sending the maximum allowable DC charging voltage and the maximum allowable DC charging current to the BMS is to prevent the battery pack from overcharging.

[0038] If the BMS reports that it is in DC charging within the calibration time (based on the safety calibration of different battery packs), the VCU continues to send the DC charging permission instruction, DC charging enable, maximum allowed DC charging voltage, and maximum allowed DC charging current to the BMS; otherwise, the VCU sends the BMS an end DC charging instruction and sets the maximum allowed DC charging voltage and maximum allowed DC charging current sent to the BMS to 0V and 0A, ending DC charging.

[0039] If during the charging process, it is detected that: BMS DC charging is completed, or BMS charging fails, or BMS total voltage reaches the calibration threshold (based on different battery pack safety calibration), or BMS single cell voltage reaches the calibration threshold (based on different battery pack safety calibration), the VCU sends a command to end DC charging to the BMS, and sets the maximum allowed DC charging voltage and maximum allowed DC charging current to 0V and 0A to end DC charging;

[0040] If there is no other hard-wired wake-up source after charging is completed, and the BMS hard-wired wake-up VCU wake-up source is cleared, and the BMS request for DC charging is cleared, the vehicle enters the normal power-off process and waits for the controller to sleep after powering off; otherwise, it remains in the high-voltage state.

[0041] If the high voltage state remains after charging is completed, if the DC charging gun is unplugged, the high voltage state switches to "the vehicle can be driven after high voltage is applied", and the driver can drive the vehicle at this time; otherwise, the high voltage state remains "the vehicle cannot be driven after high voltage is applied", and the driver cannot drive the vehicle at this time.

[0042] Example 4, as Figure 3 As shown, the DC charging process when the vehicle is already on high voltage:

[0043] If the vehicle detects that the BMS has hard-wired the VCU to wake up the vehicle while it is in the high-voltage state, and the DC charging cable is plugged in, the BMS requests DC charging, and the vehicle speed is below a certain threshold (determined based on safety, generally this threshold is considered to indicate that the vehicle has basically stopped), the VCU controls the vehicle to maintain high voltage and switches the high-voltage state to "the vehicle cannot be driven after high voltage is applied." This is to prevent the driver from accidentally disconnecting the charging pile with the vehicle, causing property damage.

[0044] The high-voltage status includes "the vehicle cannot be driven after high voltage is applied" and "the vehicle can be driven after high voltage is applied". After the DC charging gun is plugged in, the high-voltage status will be switched to "the vehicle cannot be driven after high voltage is applied" regardless of whether charging is on. When the high-voltage status is switched to "the vehicle cannot be driven after high voltage is applied", the VCU simultaneously sends a DC charging permission instruction, a DC charging enable, the maximum allowable DC charging voltage (based on the safety calibration of different battery packs), and the maximum allowable DC charging current (based on the safety calibration of different battery packs) to the BMS. Among them, sending the DC charging permission instruction and DC charging enable to the BMS is to start DC charging, and sending the maximum allowable DC charging voltage and the maximum allowable DC charging current to the BMS is to prevent the battery pack from overcharging.

[0045] If the BMS reports that it is in DC charging within the calibration time (based on the safety calibration of different battery packs), the VCU continues to send the DC charging permission instruction, DC charging enable, maximum allowed DC charging voltage, and maximum allowed DC charging current to the BMS; otherwise, the VCU sends the BMS an end DC charging instruction and sets the maximum allowed DC charging voltage and maximum allowed DC charging current sent to the BMS to 0V and 0A, ending DC charging.

[0046] If during the charging process, it is detected that: BMS DC charging is completed, or BMS charging fails, or BMS total voltage reaches the calibration threshold (based on different battery pack safety calibration), or BMS single cell voltage reaches the calibration threshold (based on different battery pack safety calibration), the VCU sends a command to end DC charging to the BMS, and sets the maximum allowed DC charging voltage and maximum allowed DC charging current to 0V and 0A to end DC charging;

[0047] If there is no other hard-wired wake-up source after charging is completed, and the BMS hard-wired wake-up VCU wake-up source is cleared, and the BMS request for DC charging is cleared, the vehicle enters the normal power-off process and waits for the controller to sleep after powering off; otherwise, it remains in the high-voltage state.

[0048] If the high voltage state remains after charging is completed, if the DC charging gun is unplugged, the high voltage state switches to "the vehicle can be driven after high voltage is applied", and the driver can drive the vehicle at this time; otherwise, the high voltage state remains "the vehicle cannot be driven after high voltage is applied", and the driver cannot drive the vehicle at this time.

[0049] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0050] Obviously, the embodiments described above are only some embodiments of the present invention, rather than all embodiments. The preferred embodiments of the present invention are given in the accompanying drawings, but they do not limit the patent scope of the present invention. The present invention can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive. Although the present invention has been described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions described in the aforementioned specific embodiments, or to make equivalent replacements for some of the technical features therein. Any equivalent structure made using the contents of the present invention specification and drawings, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the present invention.

Claims

1. A DC charging control method, characterized in that: The following steps are involved: When the vehicle detects that the BMS (Battery Management System) has hard-wired to wake up the VCU (Vehicle Control Unit) in sleep mode, a DC charging cable is plugged in, the BMS requests DC charging, and the vehicle speed is lower than a preset threshold, the VCU controls the vehicle to enter the high-voltage process and switches the high-voltage state to "the vehicle cannot be driven after high voltage is applied"; When the vehicle detects that the BMS hardwire wakes up the VCU, a DC charging cable is plugged in, the BMS requests DC charging, and the vehicle speed is lower than the preset threshold, the VCU controls the vehicle to maintain high voltage and switches the high voltage state to "the vehicle cannot be driven after high voltage is applied"; After the DC charging cable is plugged in, regardless of whether charging is in progress, the high-voltage state switches to "the vehicle cannot be driven after high voltage is applied." When the high-voltage state switches, the VCU simultaneously sends a DC charging permission command, DC charging enable, maximum allowable DC charging voltage, and maximum allowable DC charging current to the BMS. If the BMS reports that it is in DC charging within the calibration time, the VCU continues to send the above instructions and parameters; otherwise, the VCU sends a command to end DC charging to the BMS and sets the maximum DC charging voltage and current to 0V and 0A; During the charging process, if it is detected that the BMS DC charging is completed, the BMS charging fault is detected, the BMS total voltage reaches the calibration threshold, or the BMS single cell voltage reaches the calibration threshold, the VCU sends a command to end the DC charging to the BMS and sets the maximum DC charging voltage and current to 0V and 0A.

2. The DC charging control method according to claim 1, wherein: The high-voltage state includes two states: "the vehicle cannot be driven after high voltage is applied" and "the vehicle can be driven after high voltage is applied". After the DC charging gun is plugged in, the high-voltage state is switched to "the vehicle cannot be driven after high voltage is applied" regardless of whether charging is on.

3. The DC charging control method according to claim 1, wherein: The maximum allowable DC charging voltage and the maximum allowable DC charging current sent by the VCU to the BMS are determined based on the safety calibration of different battery packs.

4. The DC charging control method according to claim 1, wherein: After charging is completed, if there is no other hard-wired wake-up source, and the BMS hard-wired wake-up VCU wake-up source and BMS request for DC charging are cleared, the vehicle enters the normal power-off process; otherwise, the vehicle remains in the high-voltage state.

5. The DC charging control method according to claim 4, characterized in that: If the vehicle remains in high-voltage state after charging is completed, when the DC charging gun is unplugged, the high-voltage state switches to "the vehicle can be driven after high voltage is applied"; otherwise, the high-voltage state remains in "the vehicle cannot be driven after high voltage is applied".

6. The DC charging control method according to claim 1, wherein: It also includes real-time monitoring of battery temperature during the charging process. When the battery temperature exceeds the preset safety temperature threshold, the VCU automatically adjusts or interrupts the DC charging process.

7. The DC charging control method according to claim 1, wherein: The VCU sends a charging mode selection instruction to the BMS while sending the DC charging permission instruction and the DC charging enable instruction.

8. The DC charging control method according to claim 7, characterized in that: The selection of the fast charge mode, slow charge mode or balanced charge mode is based on the battery's current state of charge (SOC), battery state of health (SOH) and the charging preference set by the user, and is automatically determined by the VCU according to a preset algorithm or manually selected by the user.

9. The DC charging control method according to claim 1, wherein: During the DC charging process, the VCU monitors the charging power in real time and compares it with the maximum allowed DC charging power. When the charging power exceeds the maximum allowed DC charging power, the VCU sends a charging power adjustment instruction to the BMS to reduce the charging power to within the allowable range.

10. The DC charging control method according to claim 1, wherein: The VCU communicates with the vehicle's telematics unit and uploads the DC charging status and related data to the cloud platform in real time.

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