A fuel cell voltage fault monitoring method, device and terminal equipment

Abstract

The present invention discloses a fuel cell voltage fault monitoring method, device and terminal equipment, including: real-time monitoring of stack voltage information, obtaining the minimum single-chip voltage value, stack voltage variance value and stack voltage extreme value based on the stack voltage information; determining the system state based on the minimum single-chip voltage value, stack voltage variance value, stack voltage extreme value, preset parameter threshold and preset state jump condition; matching the fault type based on the system state, and dynamically monitoring the stack voltage based on the system state. The present invention determines whether there is an individual battery abnormality based on the minimum single-chip voltage value; reflects the consistency of the single-chip voltage in the stack based on the stack voltage variance value, and reflects the deviation degree of the minimum single-chip voltage from the average voltage. At the same time, through the setting of the state jump condition and the parameter threshold, the system state can be timely and comprehensively identified under different voltage abnormal conditions, thereby improving the comprehensiveness and accuracy of fuel cell voltage monitoring.

Description

Technical Field

[0001] The present invention relates to the technical field of battery inspection, and in particular to a fuel cell voltage fault monitoring method, device and terminal equipment. Background Art

[0002] The fuel cell single-chip voltage inspection system is a device used to monitor and measure the voltage of a single battery unit (single chip) in a fuel cell stack. A fuel cell stack is usually composed of multiple single-chip batteries connected in series, and the voltage of each single chip is crucial to the performance and safety of the entire battery stack. Therefore, the main function of the inspection system is to monitor the voltage of each single chip in real time, so that the inspection system can receive voltage information in time for judgment, and promptly alarm or take measures when abnormalities occur to ensure the normal operation of the battery stack.

[0003] The existing fuel cell single-chip voltage inspection method only uses the single-chip voltage as the judgment basis, which cannot cover all fault forms and abnormal voltage conditions, and cannot timely monitor and adjust the abnormal voltage state of the fuel cell stack, affecting and damaging the life of the fuel cell stack. Summary of the invention

[0004] The present invention provides a fuel cell voltage fault monitoring method, device and terminal equipment to improve the accuracy and comprehensiveness of fuel cell voltage anomaly monitoring.

[0005] In order to solve the above technical problems, an embodiment of the present invention provides a fuel cell voltage fault monitoring method, comprising:

[0006] Real-time monitoring of the stack voltage information, and obtaining the minimum single-chip voltage value, the stack voltage variance value, and the stack voltage extreme difference value based on the stack voltage information;

[0007] Determine the system state based on the minimum single chip voltage value, the stack voltage variance value, the stack voltage extreme difference value, a preset parameter threshold value and a preset state jump condition;

[0008] The stack voltage is dynamically monitored based on the system status, and the stack voltage is maintained based on the system status.

[0009] The present invention acquires the minimum single-chip voltage value, the stack voltage variance value and the stack voltage extreme value by real-time collection of the stack voltage information, and judges whether there is an individual battery abnormality based on the minimum single-chip voltage value; the stack voltage variance value reflects the consistency of the single-chip voltage in the stack, and the stack voltage extreme value reflects the degree of deviation between the minimum single-chip voltage and the average voltage; at the same time, through the setting of state jump conditions and parameter thresholds, the system status can be timely and comprehensively identified under different voltage abnormality conditions, thereby improving the comprehensiveness and accuracy of fuel cell voltage monitoring.

[0010] Further, the determining of the system state based on the minimum single chip voltage value, the stack voltage variance value, the stack voltage extreme difference value, a preset parameter threshold and a preset state jump condition includes:

[0011] When the minimum single-chip voltage value is less than or equal to the preset first single-chip voltage limit, or the stack voltage variance value is greater than or equal to the preset first voltage variance limit, or the stack voltage extreme difference value is greater than or equal to the preset first voltage extreme difference limit, the system state is the first state;

[0012] The stack voltage is monitored for abnormalities based on the first state, and the system state is dynamically adjusted based on the abnormality monitoring time and a preset state jump condition.

[0013] The present invention monitors the abnormality of the battery stack voltage based on the first state. When the minimum single-chip voltage value is lower than the threshold, it may indicate that a certain battery cell is blocked or flooded, and timely attention is required; the increase in the variance value of the battery stack voltage indicates that the voltage consistency of the single cells in the battery stack has deteriorated, which may be due to the decline in performance of some batteries or uneven chemical reactions. The increase in the extreme difference value of the battery stack voltage also reflects voltage inconsistency, which may indicate that some batteries are about to fail. According to the abnormal monitoring time and the preset state jump conditions, the system state is dynamically adjusted, and maintenance or adjustment operations are performed in advance to prevent the expansion of faults and extend the service life of the battery stack.

[0014] Furthermore, dynamically monitoring the stack voltage based on the system state and maintaining the stack voltage based on the system state includes:

[0015] When the abnormality monitoring time is less than a preset first time threshold and the stack voltage meets the first state jump condition, the system state is the second state;

[0016] When the abnormality monitoring time is greater than or equal to the first time threshold, the system state is the third state;

[0017] When the abnormality monitoring time is less than the first time threshold, and the stack voltage does not meet the first state jump condition, and the stack voltage meets the second state jump condition, the system state is the fourth state;

[0018] The first state jump condition includes that the minimum single-chip voltage value is less than or equal to the preset single-chip voltage lower limit value, or the maximum single-chip voltage is greater than or equal to the preset single-chip voltage upper limit value; the second jump condition includes that the minimum single-chip voltage value is less than or equal to the preset second single-chip voltage limit value, or the stack voltage variance value is greater than or equal to the preset second voltage variance limit value; wherein, the first single-chip voltage limit value is greater than the second single-chip voltage limit value; and the first voltage variance limit value is less than the second variance limit value.

[0019] The present invention achieves multi-level and refined management and response to abnormal voltage of fuel cell stacks by classifying abnormal states and combining abnormal monitoring time and multiple state transition conditions. The monitoring accuracy and response speed of the fuel cell voltage fault monitoring method are improved, and appropriate measures can be taken in different situations, thereby effectively extending the service life of the stack and ensuring the safe and stable operation of the fuel cell system.

[0020] Furthermore, dynamically monitoring the stack voltage based on the system state and maintaining the stack voltage based on the system state includes:

[0021] When the system state is in the second state, fault log information is reported based on the fault type, and the system state jumps to the first state.

[0022] The present invention records the fault type and related information in time and reports it when the system state is the second state, thereby giving an early warning of the fault and providing data support for subsequent troubleshooting, fault analysis and maintenance by staff.

[0023] Furthermore, the adjusting the system state based on the abnormal monitoring time and the preset state jump condition, and maintaining the stack voltage based on the system state, includes:

[0024] When the system state is in the third state, if the stack voltage meets the third state jump condition, the system state jumps to the fourth state; if the stack voltage meets the fourth state jump condition, the system state jumps to the fifth state;

[0025] The third state jump condition includes that the minimum single-chip voltage value is less than or equal to the preset second single-chip voltage limit; the fourth state jump condition includes that the minimum single-chip voltage value is greater than the preset first single-chip voltage limit, and the voltage variance stack voltage variance value is less than the first voltage variance limit, and the stack voltage extreme difference value is less than the first voltage extreme difference limit.

[0026] The present invention achieves refined management and response to abnormal voltage of the battery stack by dynamically adjusting the system state. The system can take corresponding measures according to the actual situation of voltage abnormality to ensure the safe and stable operation of the battery stack, while improving the reliability and efficiency of the system.

[0027] Furthermore, dynamically monitoring the stack voltage based on the system state and maintaining the stack voltage based on the system state includes:

[0028] When the system state is in the fourth state, the flow rates of the positive and negative electrodes, the speed of the hydrogen circulation pump and the opening time of the anode drain valve of the system are adjusted based on the preset adjustment coefficients;

[0029] After the adjustment, if the stack voltage meets the preset fifth state jump condition, the fault log information is reported; when the stack voltage meets the preset sixth state jump condition, the system state jumps to the fifth state;

[0030] The fifth state jump condition includes that the minimum single-chip voltage value is less than or equal to a preset third single-chip voltage limit, or the stack voltage variance is greater than or equal to a preset third variance limit; the sixth state jump condition includes that the minimum single-chip voltage value is greater than the first single-chip voltage limit, or the stack voltage variance value is less than the first voltage variance limit, or the stack voltage extreme difference value is less than the first voltage extreme difference limit; wherein, the third variance limit is less than the second variance limit, and the third single-chip voltage limit is less than the first single-chip voltage limit.

[0031] The present invention aims to optimize the working environment of the battery stack and gradually restore it to normal by adjusting the flow rates of the positive and negative electrodes, the speed of the hydrogen circulation pump and the opening time of the anode drain valve according to a preset adjustment coefficient. If the battery voltage still meets the fifth state jump condition after adjustment, it indicates that the voltage anomaly still exists or worsens. At this time, the system will reduce the system load, report the fault log information, and enter the specific fault details for subsequent analysis and processing. If the battery stack voltage meets the sixth state jump condition after adjustment, it indicates that the voltage anomaly has been effectively controlled and the battery stack voltage has returned to the normal range. At this time, the system state jumps to the first state and normal monitoring and operation are restored. By dynamically adjusting the system parameters, the working environment of the battery stack in the voltage abnormality state is optimized to avoid further deterioration. Through state jumps, the system can resume normal monitoring in time after the voltage anomaly is controlled, thereby improving the reliability and efficiency of the system.

[0032] Furthermore, dynamically monitoring the stack voltage based on the system state and maintaining the stack voltage based on the system state includes:

[0033] When the system state is the fifth state and the duration of the fifth state reaches a preset time threshold, if the battery stack voltage meets the seventh state jump condition, the system state jumps to the third state; if the battery stack voltage meets the eighth state jump condition, the system state jumps to the fourth state;

[0034] The seventh state jump condition includes that the minimum single-chip voltage value is less than or equal to the first single-chip voltage limit, or the stack voltage variance value is greater than or equal to the first voltage variance limit, or the stack voltage extreme difference value is greater than or equal to the first voltage extreme difference limit; the eighth state jump condition includes that the minimum single-chip voltage value is less than or equal to the first single-chip voltage limit.

[0035] The present invention ensures that the system can detect voltage anomalies by setting the seventh state jump condition, which includes that the minimum single-chip voltage value is lower than the first single-chip voltage limit, the voltage variance of the battery stack is greater than the first voltage variance limit, or the voltage extreme difference of the battery stack is greater than the first voltage extreme difference limit. By setting the eighth state jump condition, its minimum single-chip voltage value is lower than the first single-chip voltage limit, indicating that there may be serious voltage anomalies. By dynamically adjusting the system state, the working environment of the battery stack in a serious voltage anomaly state is optimized to avoid further deterioration, ensure the safe and stable operation of the battery stack, and improve the reliability and efficiency of the system.

[0036] Furthermore, the real-time monitoring of the stack voltage information and obtaining the minimum single-chip voltage value, the stack voltage variance value and the stack voltage extreme difference value based on the stack voltage information include:

[0037] Acquire the voltage information of the battery stack in real time, wherein the voltage information of the battery stack includes the voltage values ​​of all the cells in the battery stack;

[0038] The minimum single chip voltage value, the stack voltage variance value and the stack voltage extreme difference value are obtained based on the single chip voltage value.

[0039] In a second aspect, the present invention provides a fuel cell voltage fault monitoring device, comprising: a calculation module, a jump module and a monitoring module;

[0040] The calculation module is used to monitor the stack voltage information in real time, and obtain the minimum single-chip voltage value, the stack voltage variance value and the stack voltage extreme difference value based on the stack voltage information;

[0041] The jump module is used to determine the system state based on the minimum single-chip voltage value, the stack voltage variance value, the stack voltage extreme difference value, a preset parameter threshold value and a preset state jump condition;

[0042] The monitoring module is used to dynamically monitor the stack voltage based on the system status and maintain the stack voltage based on the system status.

[0043] In a third aspect, the present invention provides a terminal device, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, and when the processor executes the computer program, a fuel cell voltage fault monitoring method as described above is implemented. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 A schematic flow chart of a fuel cell voltage fault monitoring method provided by an embodiment of the present invention;

[0045] Figure 2 A schematic diagram of system state transition provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0046] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0047] The terms "first" and "second" and the like in the specification, claims and drawings of this application are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products or devices.

[0048] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0049] Example 1

[0050] See also Figure 1 , Figure 1 A schematic flow chart of a fuel cell voltage fault monitoring method provided by an embodiment of the present invention. The present invention provides a fuel cell voltage fault monitoring method, including steps 101 to 103, which are as follows:

[0051] Step 101: monitoring the voltage information of the battery stack in real time, and obtaining the minimum single-chip voltage value, the battery stack voltage variance value, and the battery stack voltage extreme difference value based on the battery stack voltage information;

[0052] In this embodiment, the real-time monitoring of the stack voltage information and obtaining the minimum single-chip voltage value, the stack voltage variance value and the stack voltage extreme difference value based on the stack voltage information include:

[0053] Acquire the voltage information of the battery stack in real time, wherein the voltage information of the battery stack includes the voltage values ​​of all the cells in the battery stack;

[0054] The minimum single chip voltage value, the stack voltage variance value and the stack voltage extreme difference value are obtained based on the single chip voltage value.

[0055] In this embodiment, the system collects the voltage information of the battery stack in real time to ensure that the system can timely and accurately grasp the working status of the battery stack and detect abnormal conditions in time. The battery stack voltage information includes the voltage values ​​of all single chips in the battery stack, so as to fully obtain the working status of the battery stack, and calculate the minimum single chip voltage value, the battery stack voltage variance value and the battery stack voltage extreme difference value based on the single chip voltage value.

[0056] In this embodiment, the minimum single-chip voltage value Vmin is determined by comparing all single-chip voltage values ​​to determine the single chip with the lowest voltage in the battery stack, and is used to evaluate the overall voltage level of the battery stack and potential single-chip failures. The smaller the value, the more serious the single-chip battery abnormality.

[0057] In this embodiment, the stack voltage variance value Var can reflect the consistency of the voltage of the single chip of the stack. The larger the value, the worse the consistency of the internal reaction. Too large a variance indicates that the internal reaction of the stack is seriously abnormal and unbalanced, which will lead to excessive local current, hot spots, and even reverse polarity, causing damage to the stack. Therefore, the stack voltage variance value can be used to evaluate the fluctuation of the stack voltage and detect abnormal voltage fluctuations in time.

[0058] In this embodiment, the stack voltage variance value Var is specifically:

[0059]

[0060] Where, Vi is the voltage of a single cell in the stack (i=1,2,3...n), is the average single cell voltage, and n is the number of cells in the stack.

[0061] In this embodiment, the stack voltage extreme difference value Vran can reflect the degree of deviation between the lowest single-chip voltage and the average voltage, and can also be used to characterize the consistency of the stack single-chip voltage. At the same time, the stack voltage extreme difference value Vran can be used to reflect the maximum fluctuation range of the stack voltage. The larger the extreme difference value, the more serious the voltage abnormality.

[0062] In this embodiment, parameter thresholds are set based on the stack design requirements and test data, wherein the parameter thresholds include a minimum single chip voltage value limit, a stack voltage variance value limit, and a stack voltage extreme difference value limit.

[0063] In this embodiment, the single-chip voltage limit is set considering the lowest potential in the fuel cell polarization state and the potential in the reverse polarity state. The single-chip voltage limit Vlimit includes a first single-chip voltage limit Vlimit1, a second single-chip voltage limit Vlimit2 and a third single-chip voltage limit Vlimit3, and Vlimit1>Vlimit2>Vlimit3.

[0064] As a specific example of an embodiment of the present invention, the lowest potential of a fuel cell in a polarized state is generally about 0.5V. When a single cell is reversed, the corresponding potential will be lower than 0V, so the setting range of Vlimit is: 0-0.5V. Vlimit3 is the lowest voltage limit of a single cell. Considering the influence of the lower potential before reverse polarity, the faster the reverse polarity trend, Vlimit3 is set to 0.2V. Vlimit1 is set lower than the lowest potential of 0.5V in a polarized state, and Vlimit2 is between Vlimit1 and Vlimit3.

[0065] In this embodiment, the stack voltage variance limit VarLimit is set according to the historical stack voltage information. The voltage variance limit VarLimit includes a first variance limit VarLimit1 and a second variance limit VarLimit2, and VarLimit1<VarLimit2.

[0066] As a specific example of an embodiment of the present invention, voltage distribution data is obtained based on historical stack voltage information. Based on the voltage distribution data, when the stack variance Var exceeds 200, the overall voltage consistency of the fuel cell will be relatively poor, with uneven or regional low voltages, so the values ​​of VarLimit1 and VarLimit2 must be greater than 200. The value of VarLimit2 is greater than VarLimit1, indicating that the overall reaction inconsistency is more serious when the variance is greater than VarLimit2.

[0067] In this embodiment, the stack voltage extreme difference limit VranLimit is set according to the historical stack voltage information. The stack voltage extreme difference limit VranLimit includes a first extreme difference limit VranLimit1 and a second extreme difference limit VranLimit2, and VranLimit1<VranLimit2.

[0068] As a specific example of an embodiment of the present invention, when the range exceeds 200, it indicates that the lowest single-chip voltage is significantly lower than the average value, and a single low situation exists. VranLimit2 is set greater than VranLimit1, indicating that when the range reaches VranLimit2, the single low situation is more serious than the VranLimit1 condition.

[0069] Step 102: determining a system state based on the minimum single chip voltage value, the stack voltage variance value, the stack voltage extreme difference value, a preset parameter threshold value, and a preset state jump condition;

[0070] In this embodiment, the system state is determined based on the minimum single chip voltage value, the stack voltage variance value, the stack voltage extreme difference value, a preset parameter threshold value and a preset state jump condition, including:

[0071] When the minimum single-chip voltage value is less than or equal to the preset first single-chip voltage limit, or the stack voltage variance value is greater than or equal to the preset first voltage variance limit, or the stack voltage extreme difference value is greater than or equal to the preset first voltage extreme difference limit, the system state is the first state;

[0072] The stack voltage is monitored for abnormalities based on the first state, and the system state is dynamically adjusted based on the abnormality monitoring time and a preset state transition condition.

[0073] In this embodiment, when the minimum single-cell voltage value is lower than the threshold, it may indicate that a battery cell has reacted abnormally and needs to be paid attention to in time; the increase in the variance value of the battery stack voltage indicates that the voltage consistency of the single cells in the battery stack has deteriorated, which may be due to the performance degradation or uneven aging of some batteries. The increase in the extreme difference value of the battery stack voltage also reflects the voltage inconsistency, which may indicate that some batteries are about to fail. When any of the above indicators exceeds the threshold, the system enters the first state, indicating that the battery stack voltage is abnormal. In this state, the system will monitor the battery stack voltage more frequently or in more detail to detect and deal with potential problems in a timely manner.

[0074] In this embodiment, based on the time of abnormal monitoring, the system may further adjust the state. For example, if the duration of the abnormality exceeds a certain limit, the system jumps to other system states to perform hierarchical monitoring and management of the system according to different system states.

[0075] In this embodiment, by monitoring the abnormality of the battery stack voltage based on the first state, when the minimum single-chip voltage value is lower than the threshold, it may indicate that a certain battery cell is over-discharged or faulty, and timely attention is required; the increase in the variance value of the battery stack voltage indicates that the voltage consistency of the single cells in the battery stack has deteriorated, which may be due to the performance degradation or uneven aging of some batteries. The increase in the extreme difference value of the battery stack voltage also reflects the voltage inconsistency, which may indicate that some batteries are about to fail, so according to the abnormal monitoring time and the preset state jump conditions, according to the dynamic adjustment of the system state, maintenance or adjustment operations are performed in advance to prevent the expansion of faults and extend the service life of the battery stack.

[0076] In this embodiment, adjusting the system state based on the abnormal monitoring time and the preset state jump condition includes:

[0077] When the abnormality monitoring time is less than a preset first time threshold and the stack voltage meets the first state jump condition, the system state is the second state;

[0078] When the abnormality monitoring time is greater than or equal to the first time threshold, the system state is the third state;

[0079] When the abnormality monitoring time is less than the first time threshold, and the stack voltage does not meet the first state jump condition, and the stack voltage meets the second state jump condition, the system state is the fourth state;

[0080] The first state jump condition includes that the minimum single-chip voltage value is less than or equal to the preset single-chip voltage lower limit value, or the maximum single-chip voltage is greater than or equal to the preset single-chip voltage upper limit value; the second jump condition includes that the minimum single-chip voltage value is less than or equal to the preset second single-chip voltage limit value, or the stack voltage variance value is greater than or equal to the preset second voltage variance limit value; wherein, the first single-chip voltage limit value is greater than the second single-chip voltage limit value; and the first voltage variance limit value is less than the second variance limit value.

[0081] In this embodiment, when the abnormality monitoring time is short and the first state jump condition is met, the system enters the second state. This indicates that when the abnormality monitoring time is long, the system enters the third state. This indicates that the voltage abnormality persists and more stringent measures may need to be taken, such as reducing the battery stack load, performing more detailed diagnosis, or starting a protection mechanism; when the abnormality monitoring time is short and the first state jump condition is not met but the second state jump condition is met, the system enters the fourth state. This indicates that the voltage abnormality is relatively small but requires attention, and medium-intensity measures can be taken, such as adjusting operating parameters or performing partial maintenance.

[0082] In this embodiment, by classifying abnormal states and combining abnormal monitoring time with multiple state transition conditions, multi-level and refined management and response to abnormal voltage of fuel cell stacks are achieved. The monitoring accuracy and response speed of the system are improved, and the system is ensured to take appropriate measures in different situations, thereby effectively extending the service life of the stack and ensuring the safe and stable operation of the fuel cell system.

[0083] Step 103: Dynamically monitor the stack voltage based on the system status, and maintain the stack voltage based on the system status.

[0084] In this embodiment, a system status and fault type table is preset to match the fault type based on the system status.

[0085] In this embodiment, the first state indicates that the system is in a normal state; the second state indicates that the CVM is disconnected or has poor contact, and the system requires no additional operation, and manual inspection of the external wiring harness is required; the third state indicates that the battery stack voltage is slightly abnormal, and the system monitors in real time whether the single-chip voltage continues to decrease, and no other processing is performed; the fourth state indicates that the battery stack voltage is seriously abnormal, and relevant operations need to be performed to alleviate it; the fifth state indicates that the system is waiting for recovery.

[0086] In this embodiment, dynamically monitoring the stack voltage based on the system state and maintaining the stack voltage based on the system state includes:

[0087] When the system state is in the second state, fault log information is reported based on the fault type, and after the system ends running, the system state jumps to the first state.

[0088] In this embodiment, since the second state indicates that the CVM is disconnected or has poor contact, the system does not require additional operation and manual inspection of the external wiring harness is required. Therefore, when the system state jumps to the second state, the system reports the fault log information and fault type. After the system ends its operation, the system state jumps back to the first state.

[0089] In this embodiment, the matching fault type helps the system to adopt corresponding processing strategies. Different fault types may require different countermeasures, and recording the fault type can ensure the pertinence of the processing measures. In addition, the monitoring in the second state is more frequent and detailed, ensuring that the fault can be discovered and recorded in time when it occurs, and then jump back to the first state for regular monitoring, forming a closed-loop management process.

[0090] In this embodiment, adjusting the system state based on the abnormal monitoring time and the preset state jump condition includes:

[0091] When the system state is in the third state, if the stack voltage meets the third state jump condition, the system state jumps to the fourth state; if the stack voltage meets the fourth state jump condition, the system state jumps to the fifth state;

[0092] The third state jump condition includes that the minimum single-chip voltage value is less than or equal to the preset second single-chip voltage limit; the fourth state jump condition includes that the minimum single-chip voltage value is greater than the preset first single-chip voltage limit, and the voltage variance stack voltage variance value is less than the first voltage variance limit, and the stack voltage extreme difference value is less than the first voltage extreme difference limit.

[0093] In this embodiment, the third state indicates that the abnormal voltage of the battery stack lasts for a long time, and more stringent measures may need to be taken. When the jump condition of the third state is met, the minimum single-chip voltage value is lower than the second single-chip voltage limit, indicating that the voltage abnormality still exists, but it may be alleviated, and the system enters the fourth state. This shows that although the voltage abnormality still exists, it may be alleviated or within a controllable range. The system can take milder measures, such as increasing the monitoring frequency or issuing a warning. When the jump condition of the fourth state is met, the voltage parameter returns to the normal range, indicating that the battery stack voltage has returned to normal, and the system can enter a more relaxed monitoring state, and the system enters the fifth state. This shows that the voltage abnormality has been effectively controlled, the battery stack voltage has returned to the normal range, and the system enters the monitoring waiting to resume normal monitoring and operation.

[0094] In this embodiment, in the third state, if the abnormality monitoring time reaches a preset threshold and the battery voltage does not always meet the third state jump condition or the fourth state jump condition, the system state jumps back to the first state.

[0095] In this embodiment, by dynamically adjusting the system state, the system can take corresponding measures according to the actual situation of voltage anomaly to ensure the safe and stable operation of the battery stack. Through state jump, the system can resume normal monitoring in time after the voltage anomaly is controlled, avoid unnecessary intervention and operation, and improve the reliability and efficiency of the system.

[0096] In this embodiment, dynamically monitoring the stack voltage based on the system state and maintaining the stack voltage based on the system state includes:

[0097] When the system state is in the fourth state, the flow rates of the positive and negative electrodes, the speed of the hydrogen circulation pump and the opening time of the anode drain valve of the system are adjusted based on the preset adjustment coefficients;

[0098] After the adjustment, if the stack voltage meets the preset fifth state jump condition, the fault log information is reported; when the stack voltage meets the preset sixth state jump condition, the system state jumps to the fifth state;

[0099] The fifth state jump condition includes that the minimum single-chip voltage value is less than or equal to a preset third single-chip voltage limit, or the stack voltage variance is greater than or equal to a preset third variance limit; the sixth state jump condition includes that the minimum single-chip voltage value is greater than the first single-chip voltage limit, or the stack voltage variance value is less than the first voltage variance limit, or the stack voltage extreme difference value is less than the first voltage extreme difference limit; wherein, the third variance limit is less than the second variance limit, and the third single-chip voltage limit is less than the first single-chip voltage limit.

[0100] In this embodiment, based on the preset adjustment coefficient, the system's anode and cathode flow rates, hydrogen circulation pump speed and anode drain valve opening time are adjusted. Specifically, on the current basis, the anode and cathode flow rates are increased by 10%, the hydrogen circulation pump speed is increased by 20%; and the anode drain valve opening time is doubled.

[0101] In this embodiment, if after adjustment, the fifth state jump condition is met within a period of time, indicating that the single-chip voltage continues to decrease or the voltage variance continues to increase, then multiple load reduction operations are performed according to the voltage situation of the battery stack; at the same time, an early warning message is sent to the network monitoring platform through the data monitoring device, indicating that the current system battery stack may have a single-chip voltage problem that cannot be actively restored, and on-site investigation is required until the preset time threshold is reached and the system jumps to the first state.

[0102] In this embodiment, if the stack voltage meets the sixth state jump condition within the preset detection time, and the voltage parameter returns to the normal range, it indicates that the stack voltage has returned to normal, and the system can enter a more relaxed monitoring state, and the system enters the fifth state. This indicates that the voltage anomaly has been effectively controlled, the stack voltage has returned to the normal range, and the system enters the monitoring waiting to resume normal monitoring and operation.

[0103] In this embodiment, the flow rates of the positive and negative electrodes, the speed of the hydrogen circulation pump, and the opening time of the anode drain valve are adjusted according to the preset adjustment coefficients, aiming to optimize the working environment of the battery stack and gradually restore it to normal. If the battery voltage still meets the fifth state jump condition after adjustment, it indicates that the voltage anomaly still exists or worsens. At this time, the system will report the fault log information and enter the specific fault details for subsequent analysis and processing. If the battery stack voltage meets the sixth state jump condition after adjustment, it indicates that the voltage anomaly has been effectively controlled and the battery stack voltage has returned to the normal range. At this time, the system state jumps to the first state and normal monitoring and operation are restored. By dynamically adjusting the system parameters, the working environment of the battery stack in the abnormal voltage state is optimized to avoid further deterioration. Through state jumps, the system can resume normal monitoring in time after the voltage anomaly is controlled, thereby improving the reliability and efficiency of the system.

[0104] In this embodiment, dynamically monitoring the stack voltage based on the system state and maintaining the stack voltage based on the system state includes:

[0105] When the system state is the fifth state and the duration of the fifth state reaches a preset time threshold, if the battery stack voltage meets the seventh state jump condition, the system state jumps to the third state; if the battery stack voltage meets the eighth state jump condition, the system state jumps to the fourth state;

[0106] The seventh state jump condition includes that the minimum single-chip voltage value is less than or equal to the first single-chip voltage limit, or the stack voltage variance value is greater than or equal to the first voltage variance limit, or the stack voltage extreme difference value is greater than or equal to the first voltage extreme difference limit; the eighth state jump condition includes that the minimum single-chip voltage value is less than or equal to the first single-chip voltage limit.

[0107] In this embodiment, the fifth state indicates that the system is waiting for recovery. When the system enters the fifth state, time monitoring starts. If the stack voltage meets the seventh state jump condition after the system has been running for a certain period of time, it indicates that the stack voltage may be slightly abnormal, so the system enters the third state for monitoring. If the stack voltage meets the seventh state jump condition after the system has been running for a certain period of time, it indicates that the stack voltage may be seriously abnormal, so the system enters the fourth state for monitoring.

[0108] In this embodiment, the fifth state is equivalent to the "observation zone". Based on the setting of the fifth state, the system can operate normally after adjustment in the third and fourth states, and ensure that the system can operate normally within a certain period of time, avoid inaccurate dynamic monitoring, and improve the reliability of the system.

[0109] Please refer to Figure 2 , Figure 2 A schematic diagram of system state transition provided by an embodiment of the present invention.

[0110] In this embodiment, the system is in a normal state in the first state. During the first state, the controller monitors in real time whether the voltage information of the battery stack meets any of the following conditions:

[0111] ① The minimum single-chip voltage value is less than or equal to the first single-chip voltage limit value, Vmin≤Vlimit1;

[0112] ② The stack voltage variance value is greater than or equal to the first voltage variance limit Var, ≥ VarLimit1;

[0113] ③ The stack voltage extreme difference is greater than or equal to the first voltage extreme difference limit, Vran ≥ VranLimit1;

[0114] If one of the above conditions is met, timer Timer1 is triggered and it is determined whether the accumulated time reaches t1;

[0115] Condition 1-2: If the minimum single-chip voltage value is less than or equal to the preset single-chip voltage lower limit value, i.e. Vmin≤Vlow (single-chip voltage lower limit value), or the maximum single-chip voltage value is greater than or equal to the preset single-chip voltage upper limit value, i.e. Vmax≥Vhigh (single-chip voltage upper limit value) during the timing of Timer1, it is determined that the CVM is disconnected or has a poor contact, and the first state enters the second state;

[0116] Condition 1-3: When the accumulated time of Timer1 reaches t1, the first state enters the third fault state;

[0117] Condition 1-4: During the timing of Timer1, if the minimum single-chip voltage value is less than or equal to the preset single-chip voltage lower limit, that is, Vmin≤Vlow (single-chip voltage lower limit), or the maximum single-chip voltage is greater than or equal to the preset single-chip voltage upper limit, that is, Vmax≥Vhigh (single-chip voltage upper limit)” condition is not met, then continue to determine whether one of the following two conditions is met:

[0118] ① The minimum single-chip voltage value is less than or equal to the preset second single-chip voltage limit value, Vmin≤Vlimit2;

[0119] ② The stack voltage variance value is greater than or equal to the preset second voltage variance limit, Var ≥ VarLimit2;

[0120] If satisfied, the first state enters the fourth state.

[0121] In this embodiment, the second state indicates a CVM disconnection or poor contact fault state.

[0122] Condition 2-1: The system ends operation and enters the first state from the second state.

[0123] In this embodiment, the third state indicates that the voltage of the battery stack is slightly abnormal. The system monitors in real time whether the voltage of the single chip continues to decrease, and does not perform other processing. After entering the third state, the timer Timer2 is triggered and starts timing;

[0124] Condition 3-4: The minimum single chip voltage value is less than or equal to the preset second single chip voltage limit value, Vmin≤Vlimit2, if it is satisfied, the state jumps from the third state to the fourth state;

[0125] Condition 3-5:

[0126] ① The minimum single-chip voltage value is greater than the first single-chip voltage limit, Vmin>Vlimit1;

[0127] ② Voltage variance The stack voltage variance value is less than the first voltage variance limit, Var<VarLimit1;

[0128] ③ The stack voltage extreme difference value is less than the first voltage extreme difference limit value, Vran<Vran1;

[0129] If the above three conditions are met at the same time, the third state will jump to the fifth state.

[0130] Condition 3-1: The system ends operation and enters the first state from the third state.

[0131] In this embodiment, the fourth state indicates that the voltage of the battery stack is seriously abnormal and needs to be alleviated by performing relevant operations. After entering the fourth state, the timer Timer3 is triggered;

[0132] During the timing of Timer3, the system performs the following operations:

[0133] ① On the current basis, the flow of positive and negative poles will be increased by 10%;

[0134] ②The speed of hydrogen circulation pump is increased by 20%;

[0135] ③The opening time of the anode drain valve is doubled;

[0136] In this embodiment, after the system operation is adjusted, if the condition "the single minimum single-chip voltage value is less than or equal to the preset third single-chip voltage limit, Vmin≤Vlimit3, or the stack voltage variance is greater than or equal to the preset third variance limit, Var≥Var3" is satisfied, that is, the single-chip voltage continues to decrease or the voltage variance continues to increase, then multiple load reduction operations are performed according to the stack voltage situation; at the same time, an early warning message is sent to the network monitoring platform through the data monitoring device, indicating that the current system stack may have a single-chip voltage problem that cannot be actively restored, and an on-site investigation is required.

[0137] Condition 4-5:

[0138] ① The minimum single-chip voltage value is greater than the first single-chip voltage limit, Vmin>Vlimit1;

[0139] ② Voltage variance The stack voltage variance value is less than the first voltage variance limit, Var<VarLimit1;

[0140] ③ The stack voltage extreme difference value is less than the first voltage extreme difference limit value, Vran<Vran1;

[0141] If the above three conditions are met at the same time, the fourth state will jump to the fifth state.

[0142] Condition 4-1: The system ends operation and enters the first state from the fourth state.

[0143] In this embodiment, the fifth state indicates that the system is waiting for recovery. After entering the fifth state, timer Timer4 is triggered. When the accumulated time of Timer4 reaches t4, that is, Timer4≥t4, the following judgment is made:

[0144] Condition 5-3: The controller monitors the stack voltage in real time to see if it meets any of the following conditions:

[0145] ① The minimum single-chip voltage value is less than or equal to the first single-chip voltage limit value, Vmin≤Vlimit1;

[0146] ② The stack voltage variance value is greater than or equal to the first voltage variance limit value, Var ≥ VarLimit1;

[0147] ③ The voltage extreme difference of the stack is greater than or equal to the first voltage extreme difference limit Vran ≥ VranLimit1;

[0148] If satisfied, the fifth state enters the third state.

[0149] Condition 5-4:

[0150] The controller monitors in real time whether the stack voltage information satisfies: the minimum single-chip voltage value is less than or equal to the first single-chip voltage limit, Vmin≤Vlimit2, and if so, the fifth state enters the fourth state.

[0151] Condition 5-1: The system ends operation and enters the first state from the fifth state.

[0152] In this embodiment, the voltage protection strategy of the fuel cell stack comprehensively considers the single-chip voltage, the extreme difference of the fuel cell stack voltage, and the fuel cell stack voltage variance. It is not limited to the monitoring and protection of the single-chip voltage, but also pays attention to the reaction of the entire fuel cell stack through the variance information. It can identify the abnormal state in advance and take necessary measures when the local or multi-chip voltage drops. Different fault states are distinguished according to the severity of the fault, and a timer is added to each fault state, and jump conditions are set between different states. In this way, an anti-shake delay is added to each fault state to avoid meaningless system action when the fault recovers after interference or a short trigger.

[0153] In this embodiment, the execution of system actions is not limited to the operating conditions of the anode and cathode. When the single-chip voltage, variance, and range of the fuel cell stack are abnormal and the system action needs to be executed, the cathode, anode, and cooling circuit operating conditions can be adjusted to confirm whether the abnormal situation has been alleviated or restored to normal values. If the abnormal situation disappears, normal operating conditions are restored. However, if the abnormal situation worsens, active load reduction operations are required while maintaining the changed operating conditions to avoid the deterioration of the abnormal situation and eventual shutdown.

[0154] The embodiment of the present invention further provides a fuel cell voltage fault monitoring device, comprising: a calculation module, a jump module and a monitoring module;

[0155] The calculation module is used to monitor the stack voltage information in real time, and obtain the minimum single-chip voltage value, the stack voltage variance value and the stack voltage extreme difference value based on the stack voltage information;

[0156] The jump module is used to determine the system state based on the minimum single-chip voltage value, the stack voltage variance value, the stack voltage extreme difference value, a preset parameter threshold value and a preset state jump condition;

[0157] The monitoring module is used to dynamically monitor the stack voltage based on the system status and maintain the stack voltage based on the system status.

[0158] In this embodiment, the jump module is used to:

[0159] When the minimum single-chip voltage value is less than or equal to the preset first single-chip voltage limit, or the stack voltage variance value is greater than or equal to the preset first voltage variance limit, or the stack voltage extreme difference value is greater than or equal to the preset first voltage extreme difference limit, the system state is the first state;

[0160] The stack voltage is monitored for abnormalities based on the first state, and the system state is dynamically adjusted based on the abnormality monitoring time and a preset state transition condition.

[0161] In this embodiment, the jump module is used to:

[0162] When the abnormality monitoring time is less than a preset first time threshold and the stack voltage meets the first state jump condition, the system state is the second state;

[0163] When the abnormality monitoring time is greater than or equal to the first time threshold, the system state is the third state;

[0164] When the abnormality monitoring time is less than the first time threshold, and the stack voltage does not meet the first state jump condition, and the stack voltage meets the second state jump condition, the system state is the fourth state;

[0165] The first state jump condition includes that the minimum single-chip voltage value is less than or equal to the preset single-chip voltage lower limit value, or the maximum single-chip voltage is greater than or equal to the preset single-chip voltage upper limit value; the second jump condition includes that the minimum single-chip voltage value is less than or equal to the preset second single-chip voltage limit value, or the stack voltage variance value is greater than or equal to the preset second voltage variance limit value; wherein, the first single-chip voltage limit value is greater than the second single-chip voltage limit value; and the first voltage variance limit value is less than the second variance limit value.

[0166] In this embodiment, the monitoring module is used to:

[0167] When the system state is the second state, reporting fault log information based on the fault type, and

[0168] The system state jumps to the first state.

[0169] In this embodiment, the monitoring module is used to:

[0170] When the system state is in the third state, if the stack voltage meets the third state jump condition, the system state jumps to the fourth state; if the stack voltage meets the fourth state jump condition, the system state jumps to the fifth state;

[0171] The third state jump condition includes that the minimum single-chip voltage value is less than or equal to the preset second single-chip voltage limit; the fourth state jump condition includes that the minimum single-chip voltage value is greater than the preset first single-chip voltage limit, and the voltage variance stack voltage variance value is less than the first voltage variance limit, and the stack voltage extreme difference value is less than the first voltage extreme difference limit.

[0172] In this embodiment, the monitoring module is used to:

[0173] When the system state is in the fourth state, the flow rates of the positive and negative electrodes, the speed of the hydrogen circulation pump and the opening time of the anode drain valve of the system are adjusted based on the preset adjustment coefficients;

[0174] After the adjustment, if the stack voltage meets the preset fifth state jump condition, the fault log information is reported; when the stack voltage meets the preset sixth state jump condition, the system state jumps to the fifth state;

[0175] The fifth state jump condition includes that the minimum single-chip voltage value is less than or equal to a preset third single-chip voltage limit, or the stack voltage variance is greater than or equal to a preset third variance limit; the sixth state jump condition includes that the minimum single-chip voltage value is greater than the first single-chip voltage limit, or the stack voltage variance value is less than the first voltage variance limit, or the stack voltage extreme difference value is less than the first voltage extreme difference limit; wherein, the third variance limit is less than the second variance limit, and the third single-chip voltage limit is less than the first single-chip voltage limit.

[0176] In this embodiment, the monitoring module is used to:

[0177] When the system state is the fifth state and the duration of the fifth state reaches a preset time threshold, if the battery stack voltage meets the seventh state jump condition, the system state jumps to the third state; if the battery stack voltage meets the eighth state jump condition, the system state jumps to the fourth state;

[0178] The seventh state jump condition includes that the minimum single-chip voltage value is less than or equal to the first single-chip voltage limit, or the stack voltage variance value is greater than or equal to the first voltage variance limit, or the stack voltage extreme difference value is greater than or equal to the first voltage extreme difference limit; the eighth state jump condition includes that the minimum single-chip voltage value is less than or equal to the first single-chip voltage limit.

[0179] In this embodiment, the calculation module is used to:

[0180] Acquire the voltage information of the battery stack in real time, wherein the voltage information of the battery stack includes the voltage values ​​of all the cells in the battery stack;

[0181] The minimum single chip voltage value, the stack voltage variance value and the stack voltage extreme difference value are obtained based on the single chip voltage value.

[0182] In an embodiment of the present invention, a terminal device is also provided, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, and the processor implements the above-mentioned fuel cell voltage fault monitoring method when executing the computer program.

[0183] In an embodiment of the present invention, a computer-readable storage medium is also provided. The computer-readable storage medium includes a stored computer program. When the computer program is running, the device where the computer-readable storage medium is located is controlled to execute the above-mentioned fuel cell voltage fault monitoring method.

[0184] Exemplarily, the computer program may be divided into one or more modules, one or more modules are stored in a memory and executed by a processor to implement the present invention. One or more modules may be a series of computer program instruction segments capable of implementing specific functions, and the instruction segments are used to describe the execution process of the computer program in a terminal device.

[0185] The terminal device may be a computing device such as a desktop computer, a notebook, a PDA, and a cloud server. The terminal device may include, but is not limited to, a processor, a memory, and a display. Those skilled in the art will appreciate that the above components are merely examples of the terminal device and do not constitute a limitation on the terminal device. The terminal device may include more or fewer components than the components, or may combine certain components, or different components. For example, the terminal device may also include input and output devices, network access devices, buses, etc.

[0186] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc. The processor is the control center of the terminal device, and uses various interfaces and lines to connect various parts of the entire terminal device.

[0187] The memory can be used to store computer programs and / or modules. The processor implements various functions of the terminal device by running or executing the computer programs and / or modules stored in the memory and calling the data stored in the memory. The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application required for a function (such as a sound playback function, a text conversion function, etc.), etc.; the data storage area can store data created according to the use of the mobile phone (such as audio data, text message data, etc.), etc. In addition, the memory can include a high-speed random access memory, and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0188] Among them, if the module based on fuel cell voltage fault monitoring is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by the processor, the steps of the above-mentioned various method embodiments can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. Computer-readable media may include: any entity or device that can carry computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium, etc. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0189] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. It is particularly pointed out that for those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A fuel cell voltage fault monitoring method, characterized in that: include: Real-time monitoring of the stack voltage information, and obtaining the minimum single-chip voltage value, the stack voltage variance value, and the stack voltage extreme difference value based on the stack voltage information; Determine the system state based on the minimum single chip voltage value, the stack voltage variance value, the stack voltage extreme difference value, a preset parameter threshold value and a preset state jump condition; The stack voltage is dynamically monitored based on the system status, and the stack voltage is maintained based on the system status.

2. A fuel cell voltage fault monitoring method as claimed in claim 1, characterized in that: The determining of the system state based on the minimum single chip voltage value, the stack voltage variance value, the stack voltage extreme difference value, a preset parameter threshold value and a preset state jump condition includes: When the minimum single-chip voltage value is less than or equal to the preset first single-chip voltage limit, or the stack voltage variance value is greater than or equal to the preset first voltage variance limit, or the stack voltage extreme difference value is greater than or equal to the preset first voltage extreme difference limit, the system state is the first state; The stack voltage is monitored for abnormalities based on the first state, and the system state is dynamically adjusted based on the abnormality monitoring time and a preset state transition condition.

3. A fuel cell voltage fault monitoring method as claimed in claim 2, characterized in that: The dynamically adjusting the system state based on the abnormal monitoring time and the preset state jump condition includes: When the abnormality monitoring time is less than a preset first time threshold and the stack voltage meets the first state jump condition, the system state is the second state; When the abnormality monitoring time is greater than or equal to the first time threshold, the system state is the third state; When the abnormality monitoring time is less than the first time threshold, and the stack voltage does not meet the first state jump condition, and the stack voltage meets the second state jump condition, the system state is the fourth state; The first state jump condition includes that the minimum single-chip voltage value is less than or equal to the preset single-chip voltage lower limit value, or the maximum single-chip voltage is greater than or equal to the preset single-chip voltage upper limit value; the second jump condition includes that the minimum single-chip voltage value is less than or equal to the preset second single-chip voltage limit value, or the stack voltage variance value is greater than or equal to the preset second voltage variance limit value; wherein, the first single-chip voltage limit value is greater than the second single-chip voltage limit value; and the first voltage variance limit value is less than the second variance limit value.

4. A fuel cell voltage fault monitoring method as claimed in claim 3, characterized in that: The dynamically monitoring the stack voltage based on the system state and maintaining the stack voltage based on the system state includes: When the system state is in the second state, fault log information is reported based on the fault type, and after the system ends running, the system state jumps to the first state.

5. A fuel cell voltage fault monitoring method as claimed in claim 4, characterized in that: The dynamically monitoring the stack voltage based on the system state and maintaining the stack voltage based on the system state includes: When the system state is in the third state, if the stack voltage meets the third state jump condition, the system state jumps to the fourth state; if the stack voltage meets the fourth state jump condition, the system state jumps to the fifth state; The third state jump condition includes that the minimum single-chip voltage value is less than or equal to the preset second single-chip voltage limit; the fourth state jump condition includes that the minimum single-chip voltage value is greater than the preset first single-chip voltage limit, and the voltage variance stack voltage variance value is less than the first voltage variance limit, and the stack voltage extreme difference value is less than the first voltage extreme difference limit.

6. A fuel cell voltage fault monitoring method as claimed in claim 5, characterized in that: The dynamically monitoring the stack voltage based on the system state and maintaining the stack voltage based on the system state includes: When the system state is in the fourth state, the flow rates of the positive and negative electrodes, the speed of the hydrogen circulation pump and the opening time of the anode drain valve of the system are adjusted based on the preset adjustment coefficients; After the adjustment, if the stack voltage meets the preset fifth state jump condition, the fault log information is reported; when the stack voltage meets the preset sixth state jump condition, the system state jumps to the fifth state; The fifth state jump condition includes that the minimum single-chip voltage value is less than or equal to a preset third single-chip voltage limit, or the stack voltage variance is greater than or equal to a preset third variance limit; the sixth state jump condition includes that the minimum single-chip voltage value is greater than the first single-chip voltage limit, or the stack voltage variance value is less than the first voltage variance limit, or the stack voltage extreme difference value is less than the first voltage extreme difference limit; wherein, the third variance limit is less than the second variance limit, and the third single-chip voltage limit is less than the first single-chip voltage limit.

7. A fuel cell voltage fault monitoring method as claimed in claim 6, characterized in that: The dynamically monitoring the stack voltage based on the system state and maintaining the stack voltage based on the system state includes: When the system state is the fifth state and the duration of the fifth state reaches a preset time threshold, if the battery stack voltage meets the seventh state jump condition, the system state jumps to the third state; if the battery stack voltage meets the eighth state jump condition, the system state jumps to the fourth state; The seventh state jump condition includes that the minimum single-chip voltage value is less than or equal to the first single-chip voltage limit, or the stack voltage variance value is greater than or equal to the first voltage variance limit, or the stack voltage extreme difference value is greater than or equal to the first voltage extreme difference limit; the eighth state jump condition includes that the minimum single-chip voltage value is less than or equal to the second single-chip voltage limit.

8. A fuel cell voltage fault monitoring method according to any one of claims 1 to 7, characterized in that: The real-time monitoring of the stack voltage information and obtaining the minimum single-chip voltage value, the stack voltage variance value and the stack voltage extreme difference value based on the stack voltage information include: Acquire the voltage information of the battery stack in real time, wherein the voltage information of the battery stack includes the voltage values ​​of all the cells in the battery stack; The minimum single chip voltage value, the stack voltage variance value and the stack voltage extreme difference value are obtained based on the single chip voltage value.

9. A fuel cell voltage fault monitoring device, characterized in that: include: Calculation module, jump module and monitoring module; The calculation module is used to monitor the stack voltage information in real time, and obtain the minimum single-chip voltage value, the stack voltage variance value and the stack voltage extreme difference value based on the stack voltage information; The jump module is used to determine the system state based on the minimum single-chip voltage value, the stack voltage variance value, the stack voltage extreme difference value, a preset parameter threshold value and a preset state jump condition; The monitoring module is used to dynamically monitor the stack voltage based on the system status and maintain the stack voltage based on the system status.

10. A terminal device, characterized in that: The invention comprises a processor, a memory and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, a fuel cell voltage fault monitoring method as claimed in any one of claims 1 to 8 is implemented.

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