Power battery direct current charging fault processing method

Abstract

The invention discloses a power battery direct current charging fault processing method. The method comprises the following steps: S1, collecting charging gun interface state information and power battery information; s2, analyzing and identifying the collected data information, and judging whether to enter a charging process or not; s3, the charging condition of the power battery is monitored and controlled, whether a fault exists or not is determined, and the fault condition is recorded and stored; the step S2 specifically comprises the following sub-steps: S21, charging and awakening a BMS based on charging gun interface state information; s22, identifying a wake-up signal and an activation flag bit; and S23, judging whether to enter a charging process or not. On the basis of the national standard direct current charging protocol, the vehicle is comprehensively detected before being charged through charging gun interface judgment, power battery diagnosis and other condition judgment, the safety of direct current charging is greatly enhanced, and the safety of personnel and property is protected.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile batteries, and in particular to a method for handling a power battery DC charging fault. Background Art

[0002] With the gradual deterioration of the global climate and the further intensification of urban air pollution, new energy vehicles are bound to become the mainstream of the future automotive market. As a key component of new energy vehicles, the safety, efficiency and convenience of DC charging of power batteries will also face rigorous market scrutiny.

[0003] There are a wide variety of charging pile manufacturers on the market. Charging piles from different brands and manufacturers are more or less different from the national standards, and there are some imperfections, which lead to the phenomenon of being unable to charge or charging too slowly, bringing a bad experience to users of new energy vehicles.

[0004] The prior art (CN115447440A) proposes a power battery charging diagnostic method, device, equipment, and storage medium. These methods identify vehicle charging signals to determine whether a charging plug is plugged in and assign a number to each charging termination event. However, when a power battery failure is detected, only the termination reason is output without storing any other power battery information. Furthermore, the diagnostics focus solely on the power battery failure, ignoring other charging risks. Summary of the Invention

[0005] In order to solve the above problems, the present invention provides a method for handling DC charging faults of power batteries, comprising the following steps: S1. Collecting charging gun interface status information and power battery information; S2. Analyzing and identifying the collected data information, and judging whether to enter the charging process; S3. Monitoring and controlling the charging status of the power battery, determining whether there is a fault and recording and storing the fault condition; the S2 step specifically includes the following sub-steps: S21. Charging and waking up the BMS based on the charging gun interface status information; S22. Identifying the wake-up signal and activating the flag; S23. Judging whether to enter the charging process.

[0006] Furthermore, the wake-up signal specifically includes: charging wake-up, vehicle wake-up, smart 12V wake-up, and RTC wake-up.

[0007] Furthermore, the control of the power battery charging status in step S3 specifically includes: charging condition judgment, DC charging process control, fault handling process control, and charging end process control.

[0008] Furthermore, the fault handling process control is specifically divided into pre-charging fault handling control and charging process fault handling control; the pre-charging fault handling control specifically includes: BMS connection fault control and power battery fault control.

[0009] Furthermore, the BMS connection fault control is specifically as follows: the CC2 signal is detected before charging. If the CC2 signal is detected to be disconnected, the BMS working state and CC2 connection state are changed to fault, sent to the vehicle controller, the fault message is recorded and the charging process is exited.

[0010] Furthermore, the power battery fault control is specifically as follows: before charging, the overall condition of the power battery and the vehicle status are detected. If an abnormality is detected in the overall condition of the power battery or the vehicle status, the BMS working state is changed to fault, sent to the vehicle controller, the fault message is recorded and the charging process is exited.

[0011] Furthermore, the abnormality in the overall condition of the power battery or the vehicle status specifically includes: failure of the vehicle insulation test, vehicle collision failure, battery aging, battery overheating, battery performance degradation, battery leakage, battery bulging, battery connection failure, vehicle battery management system failure, voltage abnormality, heat dissipation failure or thermal management failure.

[0012] Furthermore, the recorded fault message specifically includes: total battery voltage, single cell voltage, temperature extreme value, and insulation detection value.

[0013] Furthermore, a feedback optimization step is included: S4. Optimizing the charging strategy of the power battery based on the recorded fault conditions.

[0014] The present invention provides a method for handling a power battery DC charging fault, which has the following beneficial effects: Based on the national standard DC charging protocol, this invention uses conditions such as the charging gun interface and power battery diagnosis to comprehensively test the vehicle before charging, greatly enhancing the safety of DC charging and protecting personnel and property. If a fault occurs before or after charging, causing the charging process to be exited, the corresponding fault handling mechanism is activated, outputting a flash message indicating the cause of the fault and the time of occurrence. This recorded fault information is used to update the fault problem management library, continuously optimize the charging strategy, and improve the adaptability, compatibility, and safety of power battery DC charging, facilitating subsequent optimization of the charging strategy. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0016] Figure 1The present invention provides a flow chart of the method. DETAILED DESCRIPTION

[0017] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0018] The following describes the implementation method of the present invention in detail with reference to the accompanying drawings. The description only includes some embodiments, not all embodiments. For the purpose of clarity, representations and descriptions that are not related to the present invention are omitted in the drawings and descriptions.

[0019] In order to have a clearer understanding of the technical features, purposes and beneficial effects of the present invention, the technical solutions of the present invention are now described in detail below. Obviously, the implementation cases described are part of the embodiments of the present invention, not all of them, and should not be understood as limiting the scope of the implementation of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0020] like Figure 1 As shown, the present invention provides a method for handling DC charging faults of power batteries, comprising the following steps: S1. collecting charging gun interface status information and power battery information; S2. analyzing and identifying the collected data information, and judging whether to enter the charging process; S3. monitoring and controlling the charging status of the power battery, determining whether there is a fault and recording and storing the fault condition; the step S2 specifically includes the following sub-steps: S21. waking up the BMS by charging based on the charging gun interface status information; S22. identifying the wake-up signal and activating the flag bit; S23. judging whether to enter the charging process.

[0021] The wake-up signals include: charging wake-up, vehicle wake-up, smart 12V wake-up, and RTC wake-up.

[0022] The control of the power battery charging status in step S3 specifically includes: charging condition judgment, DC charging process control, fault handling process control, and charging end process control.

[0023] The fault handling process control is specifically divided into pre-charging fault handling control and charging process fault handling control; the pre-charging fault handling control specifically includes: BMS connection fault control and power battery fault control.

[0024] The BMS connection fault control is specifically as follows: the CC2 signal is detected before charging. If the CC2 signal is detected to be disconnected, the BMS working status and CC2 connection status are changed to fault, sent to the vehicle controller, the fault message is recorded and the charging process is exited.

[0025] The power battery fault control is specifically as follows: before charging, the overall condition of the power battery and the vehicle status are detected. If an abnormality is detected in the overall condition of the power battery or the vehicle status, the BMS working status is changed to fault, sent to the vehicle controller, the fault message is recorded and the charging process is exited.

[0026] Abnormalities in the overall condition of the power battery or the vehicle status include: failure of the vehicle insulation test, vehicle collision failure, battery aging, battery overheating, battery performance degradation, battery leakage, battery bulging, battery connection failure, vehicle battery management system failure, voltage abnormality, heat dissipation failure or thermal management failure.

[0027] The fault message recorded specifically includes: total battery voltage, single cell voltage, temperature extremes, and insulation detection values.

[0028] It also includes a feedback optimization step: S4. Optimizing the charging strategy of the power battery through the recorded fault conditions.

[0029] Example: The overall structure of a power battery DC charging method is to collect charging signals and vehicle information, such as DC charging wake-up signals, the current state of charge of the vehicle, etc., by a signal acquisition module, and transmit them to the information processing module according to a set protocol. After the information processing module parses the relevant data received, it enters the charging process by detecting the wake-up signal, the insertion status of the charging gun, the current state of charge of the vehicle, temperature, voltage, etc. If any of the detection items has a problem or failure, the DC charging process should be exited, and the charging end reason code and the flash information at the time of the failure should be output and recorded. During the charging process, the charging protocol message is sent and received and the charging process is controlled in accordance with the national standard. After the preset conditions for charging completion are met, the charging process is exited.

[0030] If a fault occurs during the entire DC charging process, the corresponding fault handling mechanism is activated, the charging process is promptly terminated to ensure the safety of personnel and the power battery, and the reason for charging termination and a flash message are output. By analyzing the reasons and information for charging termination, the fault problem management library is upgraded, charging strategies are continuously optimized, and the adaptability, compatibility, and safety of power battery DC charging are improved.

[0031] After the charging gun is plugged into the port, the BMS is awakened via a hardwire. After waking up, the BMS recognizes the wake-up signal and determines whether a charging gun is plugged in. DC charging national standard messages also need to be sent and received through the charging gun port.

[0032] The information processing module identifies the wake-up signal and the activation flag, selects to execute different processes, and enters different modes. After recognizing that the fast charging wake-up signal and the DC charging gun are in the connected state, it enters the DC charging process. If the charging gun is not plugged in firmly, resulting in a false connection, the charging process will be exited to avoid safety issues. The BMS enters the corresponding mode by identifying the wake-up signal. If it is a DC charging wake-up signal, it enters the DC charging process through the charging gun connection status, avoiding the failure of high-priority processes to enter normally or other process errors due to misjudgment of the wake-up signal.

[0033] Power battery diagnosis involves diagnosing the target vehicle's power battery to determine if there are any faults. If the battery is fully charged, charging is not necessary and the charging process should be terminated. If the vehicle has a collision fault or insulation failure, the charging process should be terminated immediately. If the target vehicle's battery temperature is high, DC charging will further increase the temperature in a short period of time, posing a significant safety risk, so charging should also be terminated immediately. If the vehicle controller currently disallows charging, the DC charging process should also be terminated upon receiving a vehicle message. Upon diagnosing a fault, the charging termination reason code and a flash message indicating the fault occurred are output and recorded.

[0034] Process control includes charging condition determination, DC charging process control, fault handling process control, and charging completion process control. It primarily uses the currently identified signal and parsed message content to enter the corresponding processing step, update the real-time status, operate the relevant hardware, and send the updated information via message to interactive targets such as the vehicle controller and charging station, awaiting further process information. Through sequential interactions, the entire process is advanced to complete charging.

[0035] Faults occurring during the charging process are handled in accordance with the charging process fault handling method in Appendix C of GB 27930. Faults occurring before charging are handled according to the actual fault type. For example, if the CC2 signal is detected as disconnected before charging, the BMS operating status and CC2 connection status should be changed to fault, sent to the vehicle controller, and the charging process should be exited. If the vehicle insulation test fails or a collision fault occurs, the battery system should prohibit charging, change the BMS operating status to fault, set the BMS fault level, send it to the vehicle controller, and exit the charging process. Fault information can be monitored in real time through messages, or after the event occurs, it can be understood by reading the stored fault cause and flash information to facilitate subsequent optimization of the charging strategy.

[0036] Based on the national standard DC charging protocol, this invention uses conditions such as the charging gun interface and power battery diagnosis to comprehensively test the vehicle before charging, greatly enhancing the safety of DC charging and protecting personnel and property. If a fault occurs before or after charging, causing the charging process to be exited, the corresponding fault handling mechanism is activated, outputting a flash message indicating the cause of the fault and the time of occurrence. This recorded fault information is used to update the fault problem management library, continuously optimize the charging strategy, and improve the adaptability, compatibility, and safety of power battery DC charging, facilitating subsequent optimization of the charging strategy.

[0037] The foregoing description is merely a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein and should not be construed as excluding other embodiments. Rather, the present invention can be used in various other combinations, modifications, and environments and can be modified within the scope of the concept described herein through the above teachings or techniques or knowledge in the relevant field. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention are intended to be protected by the appended claims.

Claims

1. A method for handling a power battery DC charging fault, comprising the following steps: S1. Collect charging gun interface status information and power battery information; S2. Analyze and identify the collected data information, and determine whether to enter the charging process; S3. Monitor and control the charging status of the power battery, determine whether there is a fault and record and store the fault status; characterized in that the S2 step specifically includes the following sub-steps: S21. Wake up the BMS by charging based on the charging gun interface status information; S22. Identify the wake-up signal and activate the flag; S23. Determine whether to enter the charging process.

2. The method for handling power battery DC charging fault according to claim 1, characterized in that: The wake-up signals specifically include: charging wake-up, vehicle wake-up, smart 12V wake-up, and RTC wake-up.

3. The method for handling power battery DC charging fault according to claim 1, characterized in that: The control of the power battery charging condition in step S3 specifically includes: charging condition judgment, DC charging process control, fault handling process control, and charging end process control.

4. The method for handling a power battery DC charging fault according to claim 3, characterized in that: The fault handling process control is specifically divided into pre-charging fault handling control and charging process fault handling control; The pre-charging fault processing control specifically includes: BMS connection fault control and power battery fault control.

5. The method for handling power battery DC charging failure according to claim 4, characterized in that: The BMS connection fault control is specifically as follows: before charging, the CC2 signal is detected. If the CC2 signal is detected to be disconnected, the BMS working state and CC2 connection state are changed to fault, which are sent to the vehicle controller, the fault message is recorded and the charging process is exited.

6. The method for handling power battery DC charging failure according to claim 4, characterized in that: The power battery fault control is specifically as follows: before charging, the overall condition of the power battery and the vehicle status are detected. If an abnormality is detected in the overall condition of the power battery or the vehicle status, the BMS working state is changed to fault, sent to the vehicle controller, the fault message is recorded and the charging process is exited.

7. The method for handling a power battery DC charging fault according to claim 6, characterized in that: The abnormalities in the overall condition of the power battery or the vehicle status specifically include: failure of the vehicle insulation test, vehicle collision failure, battery aging, battery overheating, battery performance degradation, battery leakage, battery bulging, battery connection failure, vehicle battery management system failure, voltage abnormality, heat dissipation failure or thermal management failure.

8. The method for handling a power battery DC charging fault according to claim 6, characterized in that: The recorded fault message specifically includes: total battery voltage, voltage of single battery cell, temperature extreme value, and insulation detection value.

9. The method for handling power battery DC charging failure according to claim 1, characterized in that: It also includes a feedback optimization step: S4. Optimizing the charging strategy of the power battery through the recorded fault conditions.

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