Cooling system anomaly detection method, device, equipment, system and vehicle

Abstract

The invention relates to a cooling system anomaly detection method, device, equipment and system and a vehicle, and relates to the technical field of thermal management. The technical problem that the accuracy of determining the abnormal state of the cooling system is low in the related technology is at least solved. Comprising the steps that the voltage difference, the first temperature and the target parameter of an electric pile in the fuel cell are obtained, the target parameter is any one of the following items: the second temperature and the voltage change rate, the voltage difference of the electric pile is the voltage difference among a plurality of single cells included in the electric pile, and the first temperature is the temperature when cooling liquid in a cooling system of the fuel cell flows into the electric pile; the second temperature is the temperature when the cooling liquid flows out of the galvanic pile, and the voltage change rate is the drop rate of the average voltage of the galvanic pile; and under the condition that the voltage difference of the electric pile is greater than a first voltage threshold value, determining an abnormal state of the cooling system based on the first temperature and the target parameter. The accuracy of determining the abnormal state of the cooling system can be improved.

Description

Technical Field

[0001] The present application relates to the field of thermal management technology, and in particular to a cooling system abnormality detection method, device, equipment, system and vehicle. Background Art

[0002] With the rapid development and popularization of new energy vehicles, new energy vehicles have become an important means of transportation to achieve sustainable development in the transportation field. Among them, fuel cells are the core components of new energy vehicles, and the corresponding fuel cell cooling system is mainly used to cool the fuel cell stack when the fuel cell is running to ensure that the stack operates within the required temperature range. However, the fuel cell stack is very sensitive to temperature, so in addition to the need to accurately control the temperature of the stack, it is also necessary to monitor and diagnose abnormal conditions in the cooling system in a timely manner.

[0003] In the related art, patent CN 117013011 A detects the pressure value of the coolant in the cooling circuit through a pressure sensor, and uses the received deviation data to correct the detected pressure value. Based on the comparison of the corrected pressure difference value with the pressure difference threshold, it is determined whether there is a coolant leak in the fuel cell system. And through the temperature detectors set at the coolant inlet and the coolant outlet, the pressure difference value is corrected based on the pressure value detected by the pressure sensor, the temperature value detected by the temperature detector and the received deviation data. This technical solution mainly corrects the pressure difference value through the pressure value detected by the pressure sensor, the temperature value detected by the temperature detector and the received deviation data, so as to determine whether there is a coolant leak in the fuel cell system according to the pressure difference value (i.e., the pressure parameter of the coolant). However, due to the complex structure of the fuel cell and the large number of parameters involved in the operation of the fuel cell, it is not accurate enough to determine whether the fuel cell system is abnormal only by the pressure value and temperature value of the coolant.

[0004] In another related technology, patent CN 117936851 A determines whether leakage occurs between the hydrogen chamber and the cooling liquid chamber based on the actual operating parameters of the fuel cell (the inlet and outlet pressure drop of the hydrogen chamber, the hydrogen concentration of the cooling liquid chamber, the rate of change of the ion concentration of the cooling liquid chamber within a predetermined period, and the rate of change of the voltage of each battery cell within a predetermined period) and the corresponding parameter threshold. This technical solution mainly determines whether there is hydrogen leakage in the cooling liquid chamber, and cannot detect other abnormal conditions in the cooling system. Therefore, the current accuracy of determining abnormal conditions in the cooling system is low. Summary of the invention

[0005] The present application provides a cooling system abnormality detection method, device, equipment, system and vehicle. The purpose of the present application is to at least solve the technical problem of low accuracy in determining an abnormal state of a cooling system in the related art.

[0006] In order to achieve the above purpose, the technical solution adopted in this application is as follows:

[0007] According to the first aspect provided by the present application, a cooling system abnormality detection method is provided, the method comprising: obtaining a voltage difference, a first temperature and a target parameter of a fuel cell stack, the target parameter being any one of the following: a second temperature, a voltage change rate, the voltage difference of the fuel cell stack being the voltage difference between a plurality of battery cells included in the fuel cell stack, the first temperature being the temperature of coolant in the cooling system of the fuel cell when it flows into the fuel cell stack, the second temperature being the temperature of the coolant when it flows out of the fuel cell stack, and the voltage change rate being the rate of decrease of the average voltage of the fuel cell stack; when the voltage difference of the fuel cell stack is greater than a first voltage threshold, determining the abnormal state of the cooling system based on the first temperature and the target parameter.

[0008] According to the above technical means, the present application can comprehensively judge the abnormal state of the cooling system of the fuel cell according to the voltage difference of the stack in the fuel cell, the temperature of the coolant when it flows into the stack, the temperature of the coolant when it flows out of the stack, and the rate of decrease of the average voltage of the stack. This is determined based on the temperature-sensitive characteristics of the fuel cell stack. No matter how the pressure of the coolant in the cooling system changes, when the coolant in the cooling system is insufficient or leaks, the temperature of the coolant will change, and the change in the temperature of the coolant will cause the voltage of the stack to change. Therefore, based on this scheme, the abnormal state of the cooling system can be accurately determined according to the voltage difference of the stack, the temperature of the coolant when it flows into the stack, the temperature of the coolant when it flows out of the stack, and the rate of decrease of the average voltage of the stack, thereby improving the accuracy of determining the abnormal state of the cooling system and ensuring the safe operation of the fuel cell.

[0009] In one possible implementation, the target parameter is a second temperature; the above-mentioned determination of an abnormal state of the cooling system based on the first temperature and the target parameter includes: when the first temperature is less than or equal to a first temperature threshold and the temperature difference of the coolant is greater than a second temperature threshold, determining that a first abnormal state occurs in the cooling system, the temperature difference of the coolant is the difference between the second temperature and the first temperature, and the first abnormal state characterizes that the volume of the coolant is within a first preset volume range, and the first preset volume range is less than the first preset volume and greater than or equal to the second preset volume.

[0010] According to the above technical means, the present application can determine that the volume of the coolant in the cooling system is less than the first volume and greater than or equal to the second volume when the first temperature is less than or equal to the first temperature threshold and the temperature difference of the coolant is greater than the second temperature threshold. In this way, it is possible to accurately determine the abnormal state of the cooling system and determine that the coolant in the cooling system is insufficient or leaking, which has a slight impact on the battery stack.

[0011] In a possible implementation, the above-mentioned determination of the abnormal state of the cooling system based on the first temperature and the target parameter includes: when the first temperature is less than or equal to the first temperature threshold and the temperature difference of the coolant is less than or equal to the second temperature threshold, determining that the cooling system has a second abnormal state, the second abnormal state characterizing that the abnormal state of the cooling system is an abnormal state not caused by the coolant.

[0012] According to the above-mentioned technical means, the present application can determine that the coolant in the cooling system is not insufficient or leaking when the first temperature is less than or equal to the first temperature threshold and the temperature difference of the coolant is less than or equal to the second temperature threshold, and determine that the abnormal state of the cooling system is not caused by the coolant, and can accurately determine the abnormal state of the cooling system.

[0013] In one possible implementation, the target parameter is the voltage change rate; the above-mentioned determination of the abnormal state of the cooling system based on the first temperature and the target parameter includes: when the first temperature is greater than the first temperature threshold and the voltage change rate is less than or equal to the preset change rate, determining that a third abnormal state occurs in the cooling system, the third abnormal state characterizing that the volume of the coolant is within a second preset volume range, and the second preset volume range is less than the second preset volume and greater than or equal to the third preset volume.

[0014] According to the above technical means, the present application can determine that the volume of the coolant in the cooling system is less than the second volume and greater than or equal to the third volume when the first temperature is greater than the first temperature threshold and the voltage change rate is less than or equal to the preset change rate. In this way, it is possible to accurately determine the abnormal state of the cooling system and determine that the coolant in the cooling system is obviously insufficient or leaking, which has a serious impact on the battery stack.

[0015] In a possible implementation, the above-mentioned determination of the abnormal state of the cooling system based on the first temperature and the target parameter includes: when the first temperature is greater than the first temperature threshold and the voltage change rate is greater than the preset change rate, determining that the cooling system has a fourth abnormal state and stopping the operation of the fuel cell, the fourth abnormal state characterizes that the volume of the coolant is within a third preset volume range, and the third preset volume range is less than the third preset volume.

[0016] According to the above technical means, the present application can determine that the volume of the coolant in the cooling system is less than the third volume when the first temperature is greater than the first temperature threshold and the voltage change rate is greater than the preset change rate. In this way, it is possible to accurately determine the abnormal state of the cooling system and determine that the coolant in the cooling system is seriously insufficient or seriously leaking, which has a serious impact on the battery stack and requires the fuel cell to be stopped to ensure the safe operation of the fuel cell.

[0017] In a possible embodiment, after determining that the cooling system has a third abnormal state, the method further includes: when the average voltage of the battery stack is less than the second voltage threshold, determining that the cooling system has a fourth abnormal state, the fourth abnormal state being characterized by the volume of the coolant being within a third preset volume range, and the third preset volume range being less than the third preset volume.

[0018] According to the above technical means, after determining that the cooling system has a third abnormal state, if it is determined that the average voltage of the stack is less than the second voltage threshold, the present application can determine that the coolant in the cooling system is continuously insufficient or leaking. Therefore, it can be determined that the volume of the coolant in the cooling system is less than the third volume, and the coolant is seriously insufficient or seriously leaking, which has a serious impact on the stack and requires the fuel cell to be stopped, thereby ensuring the safe operation of the fuel cell.

[0019] In a possible implementation, the method further includes: reducing the operating power of the fuel cell; and stopping the operation of the fuel cell when it is determined that the first temperature is continuously greater than a first temperature threshold within a first preset time period.

[0020] According to the above technical means, the present application can reduce the operating power of the fuel cell when it is determined that the coolant in the cooling system is insufficient or leaking, which affects the fuel cell stack, thereby avoiding a more serious abnormal state of the cooling system. If it is determined that the temperature of the coolant flowing into the fuel cell stack is continuously greater than the first temperature threshold within the first preset time, it is considered that the cooling system has a more serious abnormal state and the fuel cell needs to be stopped to ensure the safe operation of the fuel cell.

[0021] In a possible implementation, the method further includes: reducing the operating power of the fuel cell; and sending a prompt message when the duration of the first abnormal state in the cooling system reaches a second preset duration, the prompt message being used to instruct to check the cooling system.

[0022] According to the above-mentioned technical means, the present application can reduce the operating power of the fuel cell. If the cooling system continues to be in the first abnormal state for a second preset time, it indicates that the fuel cell has been in the first abnormal state for a long time and needs inspection and maintenance. Therefore, a prompt message can be sent to prompt the user, thereby further ensuring the safe operation of the fuel cell.

[0023] According to the second aspect provided by the present application, a cooling system abnormality detection device is provided, and the cooling system abnormality detection device includes: an acquisition module and a processing module; the acquisition module is used to acquire the voltage difference, the first temperature and the target parameter of the battery stack in the fuel cell, and the target parameter is any one of the following: the second temperature, the voltage change rate, the voltage difference of the battery stack is the voltage difference between the multiple battery cells included in the battery stack, the first temperature is the temperature of the coolant in the cooling system of the fuel cell when it flows into the battery stack, the second temperature is the temperature of the coolant when it flows out of the battery stack, and the voltage change rate is the rate of decrease of the average voltage of the battery stack; the processing module is used to determine the abnormal state of the cooling system based on the first temperature and the target parameter when the voltage difference of the battery stack is greater than the first voltage threshold.

[0024] In one possible implementation, the target parameter is a second temperature; and the processing module is specifically used to determine that a first abnormal state occurs in the cooling system when the first temperature is less than or equal to a first temperature threshold and the temperature difference of the coolant is greater than a second temperature threshold, the temperature difference of the coolant is the difference between the second temperature and the first temperature, and the first abnormal state indicates that the volume of the coolant is within a first preset volume range, and the first preset volume range is less than the first preset volume and greater than or equal to the second preset volume.

[0025] In a possible implementation, the processing module is specifically used to determine that a second abnormal state occurs in the cooling system when the first temperature is less than or equal to a first temperature threshold and the temperature difference of the coolant is less than or equal to a second temperature threshold, and the second abnormal state indicates that the abnormal state of the cooling system is an abnormal state not caused by the coolant.

[0026] In one possible implementation, the target parameter is the voltage change rate; the processing module is specifically used to determine that a third abnormal state occurs in the cooling system when the first temperature is greater than a first temperature threshold and the voltage change rate is less than or equal to a preset change rate, the third abnormal state being characterized by the volume of the coolant being within a second preset volume range, the second preset volume range being less than the second preset volume and greater than or equal to the third preset volume.

[0027] In one possible implementation, the processing module is specifically used to determine that a fourth abnormal state occurs in the cooling system and the fuel cell is stopped when the first temperature is greater than a first temperature threshold and the voltage change rate is greater than a preset change rate, and the fourth abnormal state indicates that the volume of the coolant is within a third preset volume range, and the third preset volume range is less than the third preset volume.

[0028] In a possible embodiment, the processing module is also used to determine that a fourth abnormal state has occurred in the cooling system when the average voltage of the battery stack is less than the second voltage threshold, and the fourth abnormal state is characterized by the volume of the coolant being within a third preset volume range, and the third preset volume range is less than the third preset volume.

[0029] In a possible implementation, the processing module is further used to reduce the operating power of the fuel cell; the processing module is further used to stop the operation of the fuel cell when it is determined that the first temperature is continuously greater than the first temperature threshold within a first preset time period.

[0030] In one possible implementation, the processing module is also used to reduce the operating power of the fuel cell; the processing module is also used to send a prompt message when the duration of the first abnormal state in the cooling system reaches a second preset duration, and the prompt message is used to instruct to check the cooling system.

[0031] According to the third aspect provided by the present application, an electronic device is provided, comprising: a processor; a memory for storing processor executable instructions; wherein the processor is configured to execute instructions to implement the method of the above-mentioned first aspect and any possible implementation manner thereof.

[0032] According to the fourth aspect provided by the present application, a computer-readable storage medium is provided. When the instructions in the computer-readable storage medium are executed by a processor of an electronic device, the electronic device executes the method of the above-mentioned first aspect and any possible implementation method thereof.

[0033] According to the fifth aspect provided by the present application, a computer program product is provided, the computer program product comprising computer instructions, and when the computer instructions are executed on an electronic device, the electronic device executes the method of the above-mentioned first aspect and any possible implementation manner thereof.

[0034] According to a sixth aspect provided by the present application, a vehicle is provided, the vehicle comprising a cooling system abnormality detection device as in the second aspect, and the vehicle is used to implement the method of the above-mentioned first aspect and any possible implementation manner thereof.

[0035] Therefore, the above technical features of the present application have the following beneficial effects:

[0036] (1) The present application can comprehensively judge the abnormal state of the cooling system of the fuel cell based on the voltage difference of the fuel cell stack, the temperature of the coolant when it flows into the fuel cell stack, the temperature of the coolant when it flows out of the fuel cell stack, and the rate of decrease of the average voltage of the fuel cell stack. This is determined based on the temperature-sensitive characteristics of the fuel cell stack. No matter how the pressure of the coolant in the cooling system changes, when the coolant in the cooling system is insufficient or leaks, the temperature of the coolant will change, and the change in the temperature of the coolant will cause the voltage of the fuel cell stack to change. Therefore, based on this scheme, the abnormal state of the cooling system can be accurately determined based on the voltage difference of the fuel cell stack, the temperature of the coolant when it flows into the fuel cell stack, the temperature of the coolant when it flows out of the fuel cell stack, and the rate of decrease of the average voltage of the fuel cell stack, thereby improving the accuracy of determining the abnormal state of the cooling system and ensuring the safe operation of the fuel cell.

[0037] (2) The present application can determine that the volume of the coolant in the cooling system is less than the first volume and greater than or equal to the second volume when the first temperature is less than or equal to the first temperature threshold and the temperature difference of the coolant is greater than the second temperature threshold. This can accurately determine the abnormal state of the cooling system and determine that the coolant in the cooling system is insufficient or leaking, causing a slight impact on the fuel cell stack.

[0038] (3) The present application can determine that there is no shortage or leakage of coolant in the cooling system, and determine that the abnormal state of the cooling system is not caused by the coolant when the first temperature is less than or equal to the first temperature threshold and the temperature difference of the coolant is less than or equal to the second temperature threshold, and can accurately determine the abnormal state of the cooling system.

[0039] (4) The present application can determine that the volume of the coolant in the cooling system is less than the second volume and greater than or equal to the third volume when the first temperature is greater than the first temperature threshold and the voltage change rate is less than or equal to the preset change rate. This can accurately determine the abnormal state of the cooling system and determine that the coolant in the cooling system is obviously insufficient or leaking, which has a serious impact on the battery stack.

[0040] (5) The present application can determine that the volume of the coolant in the cooling system is less than the third volume when the first temperature is greater than the first temperature threshold and the voltage change rate is greater than the preset change rate. This can accurately determine the abnormal state of the cooling system and determine that the coolant in the cooling system is seriously insufficient or seriously leaking, which has a serious impact on the fuel cell stack and requires the fuel cell to be stopped to ensure the safe operation of the fuel cell.

[0041] (6) After determining that the cooling system is in the third abnormal state, the present application can determine that the coolant in the cooling system is continuously insufficient or leaking if it is determined that the average voltage of the stack is less than the second voltage threshold. Therefore, it can be determined that the volume of the coolant in the cooling system is less than the third volume, and the coolant is seriously insufficient or seriously leaking, which has a serious impact on the stack and requires stopping the operation of the fuel cell, thereby ensuring the safe operation of the fuel cell.

[0042] (7) The present application can reduce the operating power of the fuel cell when it is determined that the coolant in the cooling system is insufficient or leaking, which affects the fuel cell stack, thereby avoiding a more serious abnormal state of the cooling system. If it is determined that the temperature of the coolant flowing into the fuel cell stack is continuously greater than the first temperature threshold within the first preset time, it is considered that the cooling system has a more serious abnormal state and the fuel cell needs to be stopped, thereby ensuring the safe operation of the fuel cell.

[0043] (8) The present application can reduce the operating power of the fuel cell. If the cooling system continues to be in the first abnormal state for a second preset time, it means that the fuel cell has been in the first abnormal state for a long time and needs to be inspected and repaired. Therefore, a prompt message can be sent to prompt the user, thereby further ensuring the safe operation of the fuel cell.

[0044] It should be noted that the technical effects brought about by any implementation method in the second to sixth aspects can refer to the technical effects brought about by the corresponding implementation method in the first aspect, and will not be repeated here.

[0045] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification are used to explain the principles of the present application, and do not constitute an improper limitation on the present application.

[0047] Figure 1 is a structural schematic diagram of a cooling system abnormality detection system according to an exemplary embodiment;

[0048] Figure 2 is a structural schematic diagram of another cooling system abnormality detection system according to an exemplary embodiment;

[0049] Figure 3 is a flow chart showing a cooling system abnormality detection method according to an exemplary embodiment;

[0050] Figure 4is a flow chart showing another cooling system abnormality detection method according to an exemplary embodiment;

[0051] Figure 5 is a flow chart showing another cooling system abnormality detection method according to an exemplary embodiment;

[0052] Figure 6 is a flow chart showing another cooling system abnormality detection method according to an exemplary embodiment;

[0053] Figure 7 is a flow chart showing another cooling system abnormality detection method according to an exemplary embodiment;

[0054] Figure 8 is a block diagram of a cooling system abnormality detection device according to an exemplary embodiment;

[0055] Fig. 9 It is a block diagram of an electronic device according to an exemplary embodiment. DETAILED DESCRIPTION

[0056] In order to enable ordinary persons in the art to better understand the technical solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0057] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims.

[0058] The cooling system abnormality detection method provided in the embodiment of the present application can be applied to the cooling system abnormality detection system. Figure 1 FIG. 2 shows a schematic diagram of the structure of a cooling system abnormality detection system. Figure 1 As shown, the cooling system abnormality detection system 10 includes: a controller 11 and a fuel cell 12. The controller 11 may be a fuel cell controller, and the fuel cell 12 includes a fuel cell stack and a cooling system.

[0059] The controller 11 can obtain the voltage difference, the first temperature and the target parameter of the fuel cell stack in the fuel cell 12, where the target parameter is any one of the following: the second temperature, the voltage change rate, the voltage difference of the fuel cell stack is the voltage difference between the multiple battery cells included in the fuel cell stack, the first temperature is the temperature of the coolant in the cooling system of the fuel cell 12 when it flows into the fuel cell stack, the second temperature is the temperature of the coolant when it flows out of the fuel cell stack, and the voltage change rate is the rate of decrease of the average voltage of the fuel cell stack.

[0060] The controller 11 may also determine an abnormal state of the cooling system based on the first temperature and the target parameter when the voltage difference of the battery stack is greater than the first voltage threshold.

[0061] In some embodiments, the target parameter is the second temperature; the controller 11 can specifically determine that a first abnormal state occurs in the cooling system when the first temperature is less than or equal to a first temperature threshold and the temperature difference of the coolant is greater than a second temperature threshold, the temperature difference of the coolant is the difference between the second temperature and the first temperature, and the first abnormal state indicates that the volume of the coolant is within a first preset volume range, and the first preset volume range is less than the first preset volume and greater than or equal to the second preset volume.

[0062] In some embodiments, the controller 11 can specifically determine that a second abnormal state occurs in the cooling system when the first temperature is less than or equal to a first temperature threshold and the temperature difference of the coolant is less than or equal to a second temperature threshold, and the second abnormal state indicates that the abnormal state of the cooling system is an abnormal state not caused by the coolant.

[0063] In some embodiments, the target parameter is the voltage change rate; the controller 11 can specifically determine that the cooling system has a third abnormal state when the first temperature is greater than the first temperature threshold and the voltage change rate is less than or equal to the preset change rate. The third abnormal state is characterized by the volume of the coolant being within a second preset volume range, and the second preset volume range is less than the second preset volume and greater than or equal to the third preset volume.

[0064] In some embodiments, the controller 11 can specifically determine that the cooling system has a fourth abnormal state and stop operating the fuel cell 12 when the first temperature is greater than the first temperature threshold and the voltage change rate is greater than a preset change rate. The fourth abnormal state indicates that the volume of the coolant is within a third preset volume range, and the third preset volume range is smaller than the third preset volume.

[0065] In some embodiments, the controller 11 can also determine that a fourth abnormal state has occurred in the cooling system when the average voltage of the battery stack is less than the second voltage threshold, and the fourth abnormal state is characterized by the volume of the coolant being within a third preset volume range, and the third preset volume range is less than the third preset volume.

[0066] In some embodiments, the controller 11 may also reduce the operating power of the fuel cell 12 ; if it is determined that the first temperature is continuously greater than the first temperature threshold within a first preset time period, the fuel cell 12 is stopped from operating.

[0067] In some embodiments, Figure 2 FIG. 2 shows a schematic diagram of another cooling system abnormality detection system. Figure 2 As shown, the cooling system abnormality detection system may specifically include: a fuel cell stack, a voltage inspection module, a fuel cell controller, a water pump, a three-way valve, an inlet water temperature sensor, an outlet water temperature sensor, an expansion kettle, a radiator and a fan, a coolant and corresponding pipelines, etc. Among them, the water pump, the three-way valve, the inlet water temperature sensor, the outlet water temperature sensor, the expansion kettle, the radiator and the fan, and the coolant may constitute a cooling system for regulating the temperature of the fuel cell stack.

[0068] Specifically, the voltage inspection module is used to collect the maximum voltage, average voltage and minimum voltage when the stack is running. The fuel cell controller is used to receive signals from the water inlet temperature sensor, the water outlet temperature sensor, the voltage inspection module, and control the operation of the water pump, the three-way valve and the fan. The water pump is used to control the circulation of the coolant, the three-way valve is used to mix the large and small circulating coolants, and the radiator and the fan are used to cool the coolant. The water inlet temperature sensor and the water outlet temperature sensor are used to collect the temperature of the coolant when it flows into the stack and the temperature of the coolant when it flows out of the stack. The expansion kettle is used to add coolant and discharge gas in the pipeline. Finally, under the joint action of the fuel cell controller, water pump, radiator and fan, three-way valve and other actuators, the purpose of effectively controlling the temperature of the fuel cell stack is achieved.

[0069] Since the fuel cell stack is very sensitive to temperature, in addition to requiring the actuators included in the cooling system to accurately control the temperature of the coolant, when abnormal problems occur in the cooling system, timely monitoring and diagnosis should also be carried out. At present, the routine diagnosis of sensors and actuators such as temperature sensors, water pumps and three-way valves has been developed to a relatively mature level. However, the diagnosis of coolant, especially the diagnosis related to insufficient or leaked coolant, is less involved. When the coolant in the cooling system leaks, two situations may occur in the fuel cell: 1) bubbles appear in the cooling system pipeline, causing uneven heating inside the fuel cell stack, and even local hot spots; 2) the heat generated cannot be taken away in time, causing the fuel cell stack to overheat. If the above two situations last too long, they will cause irreversible damage to the fuel cell, so it is necessary to diagnose the insufficient or leaked coolant.

[0070] For ease of understanding, the cooling system abnormality detection method provided in the present application is specifically introduced below with reference to the accompanying drawings.

[0071] Figure 3 is a flow chart showing a cooling system abnormality detection method according to an exemplary embodiment. Figure 3 As shown, the method includes the following S301-S302:

[0072] S301, obtaining a voltage difference, a first temperature and a target parameter of a fuel cell stack.

[0073] Among them, the target parameters are any of the following: the second temperature, the voltage change rate, the voltage difference of the battery stack is the voltage difference between the multiple battery cells included in the battery stack, the first temperature is the temperature of the coolant in the cooling system of the fuel cell when it flows into the battery stack, the second temperature is the temperature of the coolant when it flows out of the battery stack, and the voltage change rate is the rate of decrease of the average voltage of the battery stack.

[0074] Optionally, after the fuel cell enters the operating mode, the voltage inspection module can monitor the voltage parameters of the fuel cell stack in real time, and the water inlet temperature sensor can monitor the temperature of the coolant in the fuel cell cooling system when it flows into the stack, and the water outlet temperature sensor can monitor the temperature of the coolant when it flows out of the stack.

[0075] Specifically, since the battery stack includes multiple battery cells, the total voltage of the battery stack is determined by the voltages provided by the multiple battery cells. However, the voltages provided by each battery cell are not completely consistent, so it is necessary to monitor the maximum voltage and the minimum voltage of each of the multiple battery cells in the battery stack in real time and determine the average voltage. Therefore, based on the change of the average voltage of the battery stack within a certain period of time, the rate of decrease of the average voltage (or the rate of increase of the average voltage) is determined.

[0076] Optionally, before obtaining the voltage difference, the first temperature and the target parameters of the fuel cell stack, it is also necessary to determine the operating state of the fuel cell to determine whether it is necessary to further determine whether the cooling system is abnormal.

[0077] Specifically, when the fuel cell is in the operating mode, the water inlet temperature sensor is not faulty, the water outlet temperature sensor is not faulty, the three-way valve is working properly, the water pump is working properly, the radiator and the fan are working properly, and the voltage inspection module is not faulty, it can be determined that it is necessary to further determine whether the cooling system is abnormal. If any of the conditions is not met, there is no need to further determine whether the cooling system is abnormal.

[0078] S302: When the voltage difference of the fuel cell stack is greater than a first voltage threshold, determine an abnormal state of the cooling system based on the first temperature and the target parameter.

[0079] Optionally, it is necessary to first check the voltage difference of the battery stack. If the voltage difference of the battery stack is less than or equal to a first voltage threshold (that is, the voltage difference of the battery stack is within a normal range), it is considered that there is no abnormality in the cooling system (that is, there is no shortage or leakage of the coolant, and the volume of the coolant is greater than or equal to the first volume), and there is no need to make further judgments based on the first temperature and target parameters.

[0080] Specifically, the voltage difference of the battery stack can be determined according to the voltage of each battery cell in the plurality of battery cells included in the battery stack, that is, the maximum voltage and the minimum voltage of the battery cell are determined, and the voltage difference of the battery stack is determined by the difference between the maximum voltage and the minimum voltage.

[0081] Optionally, when the voltage difference of the battery stack is greater than the first voltage threshold, it can be considered that the internal heating temperature of the battery stack is uneven, and the voltage of some battery cells is higher, while the voltage of some battery cells is lower. At this time, it can be considered that the cooling system has an abnormality and cannot normally adjust the temperature of the battery stack. It is necessary to further determine the specific abnormal state of the cooling system based on the temperature when the coolant flows into the battery stack and the target parameter (i.e., the temperature or voltage change rate when the coolant flows out of the battery stack).

[0082] In the embodiment of the present application, the present application can comprehensively judge the abnormal state of the cooling system of the fuel cell according to the voltage difference of the stack in the fuel cell, the temperature of the coolant when it flows into the stack, the temperature of the coolant when it flows out of the stack, and the rate of decrease of the average voltage of the stack. This is determined based on the temperature-sensitive characteristics of the fuel cell stack. Since no matter how the pressure of the coolant in the cooling system changes, when the coolant in the cooling system is insufficient or leaks, the temperature of the coolant will change, and the change in the temperature of the coolant will cause the voltage of the stack to change. Therefore, based on this scheme, the abnormal state of the cooling system can be accurately determined according to the voltage difference of the stack, the temperature of the coolant when it flows into the stack, the temperature of the coolant when it flows out of the stack, and the rate of decrease of the average voltage of the stack, thereby improving the accuracy of determining the abnormal state of the cooling system and ensuring the safe operation of the fuel cell.

[0083] In some embodiments, the target parameter is a second temperature; Figure 4 As shown, in a cooling system abnormality detection method provided in an embodiment of the present application, the above step S302 may specifically include S401 or S402:

[0084] S401. When the voltage difference of the battery stack is greater than a first voltage threshold, the first temperature is less than or equal to a first temperature threshold, and the temperature difference of the coolant is greater than a second temperature threshold, determine that a first abnormal state occurs in the cooling system.

[0085] Among them, the temperature difference of the coolant is the difference between the second temperature and the first temperature, and the first abnormal state represents that the volume of the coolant is in a first preset volume range, and the first preset volume range is smaller than the first preset volume and greater than or equal to the second preset volume.

[0086] Optionally, if it is found that the voltage difference of the battery stack is greater than the first voltage threshold, it is necessary to further check whether the first temperature (the temperature when the coolant flows into the battery stack) is controlled (that is, whether the first temperature is less than or equal to the first temperature threshold).

[0087] Specifically, to determine whether the first temperature is under control, a target water inlet temperature may be set to determine whether a difference between the first temperature and the target water inlet temperature exceeds a limit, thereby determining whether the first temperature is under control.

[0088] Optionally, when it is determined that the first temperature is less than or equal to the first temperature threshold (i.e., the first temperature is controlled), it may be further checked whether the temperature difference of the coolant exceeds the limit (i.e., whether the temperature difference of the coolant is greater than the second temperature threshold). If the temperature difference of the coolant exceeds the limit, it is determined that "the coolant is insufficient or leaking, causing an impact on the battery stack", i.e., the volume of the coolant is less than the first volume and greater than or equal to the second volume.

[0089] In the embodiment of the present application, the present application can determine that the volume of the coolant in the cooling system is less than the first volume and greater than or equal to the second volume when the first temperature is less than or equal to the first temperature threshold and the temperature difference of the coolant is greater than the second temperature threshold. In this way, it is possible to accurately determine the abnormal state of the cooling system and determine that the coolant in the cooling system is insufficient or leaking, which has a slight impact on the battery stack.

[0090] In some embodiments, a cooling system abnormality detection method provided in an embodiment of the present application may further include: reducing the operating power of the fuel cell, and sending a prompt message when the duration of a first abnormal state in the cooling system reaches a second preset duration, wherein the prompt message is used to instruct to check the cooling system.

[0091] Optionally, when it is determined that the cooling system is in the first abnormal state, the operating power of the fuel cell can be reduced. That is, when it is determined that the coolant is insufficient or leaking, the operating power of the fuel cell can be reduced, and the temperature of the battery stack will not rise rapidly due to the operation of the fuel cell, thereby ensuring the safe operation of the fuel cell.

[0092] Furthermore, if after reducing the operating power of the fuel cell, it is determined that the temperature of the coolant when flowing into the fuel cell stack is less than or equal to the first temperature threshold, and the duration for which the temperature difference of the coolant is greater than the second temperature threshold exceeds the second preset time, it can be considered that the cooling system has been in the first abnormal state for a long time, and further inspection and maintenance of the cooling system is required.

[0093] Optionally, the prompt information can be sent to the vehicle controller via the fuel cell controller and displayed on the vehicle interface or by voice broadcast.

[0094] In an embodiment of the present application, when the operating power of the fuel cell is reduced, if the cooling system continues to be in the first abnormal state for a second preset time period, it indicates that the fuel cell has been in the first abnormal state for a long time and needs inspection and maintenance. Therefore, a prompt message can be sent to prompt the user, thereby further ensuring the safe operation of the fuel cell.

[0095] S402: When the voltage difference of the battery stack is greater than a first voltage threshold, the first temperature is less than or equal to a first temperature threshold, and the temperature difference of the coolant is less than or equal to a second temperature threshold, determine that a second abnormal state occurs in the cooling system.

[0096] The second abnormal state indicates that the abnormal state of the cooling system is not caused by the coolant.

[0097] Optionally, when it is determined that the first temperature is less than or equal to the first temperature threshold (i.e., the first temperature is controlled), and further inspection determines that the temperature difference of the coolant is within the limit, it is judged as a "fault unrelated to insufficient or leaking coolant", that is, the abnormal state of the cooling system is an abnormal state not caused by the coolant.

[0098] It should be noted that when it is determined that the temperature of the coolant when it flows into the fuel cell stack is not overheated and the temperature difference of the coolant is not out of limit, it is considered that the coolant is sufficient and there is no leakage. The abnormal state of the cooling system is not caused by insufficient coolant.

[0099] In an embodiment of the present application, the present application can determine that the coolant in the cooling system is not insufficient or leaking, and determine that the abnormal state of the cooling system is not caused by the coolant when the first temperature is less than or equal to the first temperature threshold and the temperature difference of the coolant is less than or equal to the second temperature threshold, and can accurately determine the abnormal state of the cooling system.

[0100] In some embodiments, the target parameter is the voltage change rate; Figure 5 As shown, in a cooling system abnormality detection method provided in an embodiment of the present application, the above step S302 may specifically include S501 or S502:

[0101] S501. When the voltage difference of the battery stack is greater than a first voltage threshold, the first temperature is greater than a first temperature threshold, and the voltage change rate is less than or equal to a preset change rate, determine that a third abnormal state occurs in the cooling system.

[0102] The third abnormal state indicates that the volume of the coolant is within a second preset volume range, and the second preset volume range is smaller than the second preset volume and greater than or equal to the third preset volume.

[0103] Optionally, when it is determined that the first temperature is greater than the first temperature threshold (i.e., the first temperature is not controlled), it may be further checked whether the voltage change rate of the battery stack exceeds the limit (i.e., whether the voltage change rate is less than or equal to the preset change rate). If the voltage change rate does not exceed the limit, it is determined that "the coolant is obviously insufficient or leaking, which has an impact on the battery stack, and if it continues, it will have a serious impact on the battery stack", that is, the volume of the coolant is less than the second volume and greater than or equal to the third volume.

[0104] In the embodiment of the present application, the present application can determine that the volume of the coolant in the cooling system is less than the second volume and greater than or equal to the third volume when the first temperature is greater than the first temperature threshold and the voltage change rate is less than or equal to the preset change rate. In this way, it is possible to accurately determine the abnormal state of the cooling system and determine that the coolant in the cooling system is obviously insufficient or leaking, which has a serious impact on the battery stack.

[0105] In some embodiments, after determining that the cooling system is in the third abnormal state, a cooling system abnormality detection method provided in an embodiment of the present application may further include S5011:

[0106] S5011. When the average voltage of the fuel cell stack is less than the second voltage threshold, determine that the cooling system is in a fourth abnormal state.

[0107] The fourth abnormal state indicates that the volume of the coolant is within a third preset volume range, and the third preset volume range is smaller than the third preset volume.

[0108] Optionally, since the temperature of the coolant flowing into the stack is no longer controlled, if the average voltage of the stack continues to decrease and is less than the second voltage threshold, it can be considered that the coolant is continuously leaking or the coolant shortage is more serious, which will have a serious impact on the stack. Therefore, it is necessary to adjust the abnormal state of the cooling system to the fourth abnormal state, which is considered to be "severe lack of coolant or severe leakage, causing serious impact on the stack."

[0109] In the embodiment of the present application, after determining that the cooling system is in the third abnormal state, if it is determined that the average voltage of the stack is less than the second voltage threshold, it can be determined that the coolant in the cooling system is continuously insufficient or leaking. Therefore, it can be determined that the volume of the coolant in the cooling system is less than the third volume, and the coolant is seriously insufficient or seriously leaking, which has a serious impact on the stack and needs to stop running the fuel cell, thereby ensuring the safe operation of the fuel cell.

[0110] S502: When the voltage difference of the fuel cell stack is greater than the first voltage threshold, the first temperature is greater than the first temperature threshold, and the voltage change rate is greater than a preset change rate, determine that the cooling system has a fourth abnormal state and stop running the fuel cell.

[0111] The fourth abnormal state indicates that the volume of the coolant is within a third preset volume range, and the third preset volume range is smaller than the third preset volume.

[0112] Optionally, when it is determined that the first temperature is greater than the first temperature threshold (i.e., the first temperature is uncontrolled), and further inspection determines that the voltage change rate of the fuel cell stack exceeds the limit, it is judged that "the coolant is seriously insufficient or seriously leaked, causing serious impact on the fuel cell stack", that is, the volume of the coolant is less than the third volume.

[0113] It should be noted that when it is determined that the temperature of the coolant flowing into the fuel cell stack is over-temperature and the voltage change rate of the fuel cell stack exceeds the limit, it is considered that the coolant is seriously insufficient and the coolant is seriously leaking.

[0114] In the embodiment of the present application, the present application can determine that the volume of the coolant in the cooling system is less than the third volume when the first temperature is greater than the first temperature threshold and the voltage change rate is greater than the preset change rate. Thus, it is possible to accurately determine the abnormal state of the cooling system, determine that the coolant in the cooling system is seriously insufficient or seriously leaked, and cause serious impact on the battery stack, and need to stop the operation of the fuel cell to ensure the safe operation of the fuel cell.

[0115] In some embodiments, Figure 6 As shown, a cooling system abnormality detection method provided in an embodiment of the present application may further include S601-S602:

[0116] S601. Reduce the operating power of the fuel cell.

[0117] Optionally, when it is determined that the cooling system is in the first abnormal state or the third abnormal state, the operating power of the fuel cell can be reduced. That is, when it is determined that the coolant is insufficient or leaking, the operating power of the fuel cell can be reduced, and the temperature of the battery stack will not rise rapidly due to the operation of the fuel cell, thereby ensuring the safe operation of the fuel cell.

[0118] S602: When it is determined that the first temperature is continuously greater than the first temperature threshold within a first preset time period, stop the operation of the fuel cell.

[0119] Furthermore, if the temperature of the coolant flowing into the fuel cell stack continues to exceed the temperature within the first preset time after the operating power of the fuel cell is reduced, it can be determined that the abnormality of the cooling system is serious and the fuel cell needs to be stopped for maintenance.

[0120] Optionally, for various abnormal conditions of the cooling system, an alarm may be given by lighting a fault lamp, so that different abnormal conditions may be indicated by lighting different lamps.

[0121] Specifically, as shown in Table 1, if it is determined that the coolant is not insufficient or leaking (i.e., there is no fault), the fault light may not be lit; if it is determined that the abnormal state of the cooling system is an abnormal state not caused by the coolant, the light may be lit according to the specific diagnosed fault, which is not limited here; if it is determined that the coolant is insufficient or leaking, which has an impact on the battery stack (i.e., the first abnormal state), the operating power of the fuel cell may be reduced, which is a performance failure fault, and the yellow fault light may be lit, and the fuel cell may continue to operate. If the yellow fault light is lit for a long time, it is recommended to check and repair; if it is determined that the coolant is obviously insufficient or leaking, which has an impact on the battery stack (i.e., the third abnormal state), if it continues, it will have a serious impact on the battery stack, and the operating power of the fuel cell may be reduced, which is a performance failure fault, and the yellow fault light may be lit. Within a period of time after the operating power is reduced, if the temperature of the coolant when it flows into the battery stack is still uncontrolled, the fuel cell stops running and turns into a functional failure fault, and the red fault light is lit; if it is determined that the coolant is seriously insufficient or seriously leaking, which has a serious impact on the battery stack (i.e., the fourth abnormal state), the fuel cell stops running, which is a functional failure fault, and the red fault light is lit.

[0122] Table 1

[0123]

[0124] In the embodiment of the present application, the present application can reduce the operating power of the fuel cell when it is determined that the coolant in the cooling system is insufficient or leaking, which affects the stack, thereby avoiding a more serious abnormal state of the cooling system. If it is determined that the temperature of the coolant flowing into the stack is continuously greater than the first temperature threshold within the first preset time, it is considered that the cooling system has a more serious abnormal state, and the fuel cell needs to be stopped, thereby ensuring the safe operation of the fuel cell.

[0125] For example, Figure 7As shown, after the fuel cell enters the operation mode, it can be determined whether the voltage difference of the battery stack is less than or equal to the first voltage threshold. If it is determined that the voltage difference of the battery stack is greater than the first voltage threshold, it is determined that "there is no shortage or leakage of the coolant". If it is determined that the voltage difference of the battery stack is less than or equal to the first voltage threshold, it is further determined whether the first temperature (i.e., the temperature when the coolant flows into the battery stack) is less than or equal to the first temperature threshold. When it is determined that the temperature when the coolant flows into the battery stack is less than or equal to the first temperature threshold, it is further determined whether the temperature difference of the coolant is greater than the second temperature threshold. If it is determined that the temperature difference of the coolant is greater than the second temperature threshold, it is determined that "the coolant is insufficient or leaked, which has an impact on the battery stack". If it is determined that the temperature difference of the coolant is less than or equal to the second temperature threshold, it is determined that the cooling system has a "fault unrelated to insufficient or leaked coolant". When it is determined that the temperature when the coolant flows into the battery stack is greater than the first temperature threshold, it is further determined whether the voltage change rate is less than or equal to the preset change rate. If it is determined that the voltage change rate is less than or equal to the preset change rate, it is determined that "the coolant is obviously insufficient or leaking, which has an impact on the fuel cell stack. If it continues, it will have a serious impact on the fuel cell stack." If it is determined that the voltage change rate is greater than the preset change rate, it is determined that "the coolant is seriously insufficient or leaking, which has a serious impact on the fuel cell stack." Based on this, the fault can be managed according to the diagnosis results.

[0126] This application is based on the fact that the fuel cell stack is very sensitive to temperature. When the coolant in the cooling system is reduced from the normal amount to a certain extent, bubbles will inevitably appear in the pipeline, which will cause uneven heating inside the fuel cell, resulting in a larger voltage difference in the stack (the difference between the maximum voltage and the minimum voltage of the stack becomes larger). At this time, the temperature of the coolant flowing into the stack is controlled. Due to the presence of bubbles in the pipeline, the temperature of the coolant flowing into the stack will be higher, and therefore the coolant temperature difference will be large. If the coolant continues to decrease and decreases to a certain extent, in addition to the characteristic of the increased voltage difference of the stack, the coolant will not be able to take away the heat generated by the stack due to insufficient coolant, causing the temperature of the coolant flowing into the stack to exceed the target temperature, resulting in a drop in the overall voltage of the stack, that is, a drop in the average voltage of the stack.

[0127] Therefore, the method provided in the embodiment of the present application can identify the severity of insufficient coolant or leakage during the operation of the fuel cell, and then formulate a fault lighting strategy through fault management to remind the user to check and repair. The present application does not rely on a water pressure sensor, does not need to be performed at a fixed water pump speed, and does not require a relatively stable water pressure to make an accurate diagnosis, and has high universality. In addition, the diagnosis is also performed in combination with the temperature of the coolant on the basis of the voltage parameters of the stack, and the accuracy of the diagnosis is high. It can also identify the severity of insufficient coolant or leakage in the cooling system, and formulate different lighting strategies to remind users, and the user experience is good.

[0128] The above mainly introduces the solution provided by the embodiment of the present application from the perspective of the method. In order to achieve the above functions, the cooling system abnormality detection device or electronic device includes a hardware structure and / or software module corresponding to the execution of each function. It should be easily appreciated by those skilled in the art that, in combination with the units and algorithm steps of each example described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present application.

[0129] The embodiments of the present application can exemplarily divide the functional modules of the cooling system abnormality detection device or the electronic device according to the above method. For example, the cooling system abnormality detection device or the electronic device may include various functional modules corresponding to the various functional divisions, or two or more functions may be integrated into one processing module. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of modules in the embodiments of the present application is schematic and is only a logical functional division. There may be other division methods in actual implementation.

[0130] Figure 8 is a block diagram of a cooling system abnormality detection device according to an exemplary embodiment. Figure 8 The cooling system abnormality detection device 800 includes: an acquisition module 801 and a processing module 802.

[0131] The acquisition module 801 is used to obtain the voltage difference, the first temperature and the target parameter of the battery stack in the fuel cell, where the target parameter is any one of the following: the second temperature, the voltage change rate, the voltage difference of the battery stack is the voltage difference between the multiple battery cells included in the battery stack, the first temperature is the temperature of the coolant in the cooling system of the fuel cell when it flows into the battery stack, the second temperature is the temperature of the coolant when it flows out of the battery stack, and the voltage change rate is the rate of decrease of the average voltage of the battery stack; the processing module 802 is used to determine the abnormal state of the cooling system based on the first temperature and the target parameter when the voltage difference of the battery stack is greater than the first voltage threshold.

[0132] In one possible implementation, the target parameter is the second temperature; the processing module 802 is specifically used to determine that a first abnormal state occurs in the cooling system when the first temperature is less than or equal to a first temperature threshold and the temperature difference of the coolant is greater than a second temperature threshold, the temperature difference of the coolant is the difference between the second temperature and the first temperature, and the first abnormal state indicates that the volume of the coolant is within a first preset volume range, and the first preset volume range is less than the first preset volume and greater than or equal to the second preset volume.

[0133] In a possible implementation, the processing module 802 is specifically used to determine that a second abnormal state occurs in the cooling system when the first temperature is less than or equal to a first temperature threshold and the temperature difference of the coolant is less than or equal to a second temperature threshold, and the second abnormal state indicates that the abnormal state of the cooling system is an abnormal state not caused by the coolant.

[0134] In one possible implementation, the target parameter is the voltage change rate; the processing module 802 is specifically used to determine that a third abnormal state occurs in the cooling system when the first temperature is greater than a first temperature threshold and the voltage change rate is less than or equal to a preset change rate, and the third abnormal state indicates that the volume of the coolant is within a second preset volume range, and the second preset volume range is less than the second preset volume and greater than or equal to the third preset volume.

[0135] In one possible implementation, the processing module 802 is specifically used to determine that a fourth abnormal state occurs in the cooling system and the fuel cell is stopped when the first temperature is greater than the first temperature threshold and the voltage change rate is greater than a preset change rate, and the fourth abnormal state indicates that the volume of the coolant is within a third preset volume range, and the third preset volume range is less than the third preset volume.

[0136] In a possible embodiment, the processing module 802 is also used to determine that a fourth abnormal state occurs in the cooling system when the average voltage of the battery stack is less than the second voltage threshold, and the fourth abnormal state is characterized by the volume of the coolant being within a third preset volume range, and the third preset volume range is less than the third preset volume.

[0137] In a possible implementation, the processing module 802 is further used to reduce the operating power of the fuel cell; the processing module 802 is further used to stop the operation of the fuel cell when it is determined that the first temperature is continuously greater than the first temperature threshold within a first preset time period.

[0138] Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0139] Fig. 9FIG. 1 is a block diagram of an electronic device according to an exemplary embodiment. Fig. 9 As shown, the electronic device 900 includes but is not limited to: a processor 901 and a memory 902 .

[0140] The memory 902 is used to store executable instructions of the processor 901. It can be understood that the processor 901 is configured to execute instructions to implement the cooling system abnormality detection method in the above embodiment.

[0141] It should be noted that those skilled in the art can understand that Fig. 9 The electronic device structure shown in the figure does not constitute a limitation on the electronic device, and the electronic device may include Fig. 9 More or fewer components may be shown, or certain components may be combined, or the components may be arranged differently.

[0142] The processor 901 is the control center of the electronic device. It uses various interfaces and lines to connect various parts of the entire electronic device. By running or executing software programs and / or modules stored in the memory 902, and calling data stored in the memory 902, it performs various functions of the electronic device and processes data, thereby monitoring the electronic device as a whole. The processor 901 may include one or more processing units. Optionally, the processor 901 may integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface, and application programs, and the modem processor mainly processes wireless communications. It is understandable that the above-mentioned modem processor may not be integrated into the processor 901.

[0143] The memory 902 may be used to store software programs and various data. The memory 902 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required by at least one functional module (such as a processing module, etc.), etc. In addition, the memory 902 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0144] In an exemplary embodiment, a computer-readable storage medium including instructions is also provided, such as a memory 902 including instructions, and the above instructions can be executed by a processor 901 of an electronic device 900 to implement the cooling system abnormality detection method in the above embodiment.

[0145] In actual implementation, Figure 8 The functions of the acquisition module 801 and the processing module 802 in Fig. 9The processor 901 in the embodiment calls the computer program stored in the memory 902. The specific execution process can refer to the description of the cooling system abnormality detection method in the above embodiment, which will not be repeated here.

[0146] Optionally, the computer-readable storage medium may be a non-temporary computer-readable storage medium, for example, the non-temporary computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, etc.

[0147] In an exemplary embodiment, the present application also provides a computer program product including one or more instructions, which can be executed by the processor 901 of the electronic device 900 to complete the cooling system abnormality detection method in the above embodiment.

[0148] It should be noted that when the instructions in the above-mentioned computer-readable storage medium or one or more instructions in the computer program product are executed by the processor of the electronic device, the various processes of the above-mentioned cooling system abnormality detection method embodiment are implemented, and the same technical effect as the above-mentioned cooling system abnormality detection method can be achieved. To avoid repetition, they will not be repeated here.

[0149] Through the description of the above implementation methods, technical personnel in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0150] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0151] The units described as separate components may or may not be physically separated, and the components shown as units may be one physical unit or multiple physical units, that is, they may be located in one place or distributed in multiple different places. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0152] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0153] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on this understanding, the technical solution of the embodiment of the present application is essentially or the part that contributes to the prior art or the full classification part or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium, including a number of instructions to enable a device (which can be a single-chip microcomputer, chip, etc.) or a processor (processor) to execute the full classification part or part of the steps of each embodiment method of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, ROM, RAM, disk or CD and other media that can store program code.

[0154] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto, and any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A cooling system abnormality detection method, characterized in that: The method comprises: Obtaining a voltage difference, a first temperature and a target parameter of a stack in a fuel cell, wherein the target parameter is any one of the following: a second temperature and a voltage change rate, wherein the voltage difference of the stack is a voltage difference between a plurality of battery cells included in the stack, the first temperature is a temperature when a coolant in a cooling system of the fuel cell flows into the stack, the second temperature is a temperature when the coolant flows out of the stack, and the voltage change rate is a rate of decrease of an average voltage of the stack; When the voltage difference of the fuel cell stack is greater than a first voltage threshold, an abnormal state of the cooling system is determined based on the first temperature and the target parameter.

2. The method according to claim 1, characterized in that The target parameter is the second temperature; The determining, based on the first temperature and the target parameter, an abnormal state of the cooling system includes: When the first temperature is less than or equal to a first temperature threshold and the temperature difference of the coolant is greater than a second temperature threshold, it is determined that a first abnormal state occurs in the cooling system, the temperature difference of the coolant is the difference between the second temperature and the first temperature, and the first abnormal state indicates that the volume of the coolant is within a first preset volume range, and the first preset volume range is less than a first preset volume and greater than or equal to a second preset volume.

3. The method according to claim 2, characterized in that The determining, based on the first temperature and the target parameter, an abnormal state of the cooling system includes: When the first temperature is less than or equal to the first temperature threshold and the temperature difference of the coolant is less than or equal to the second temperature threshold, it is determined that the cooling system has a second abnormal state, and the second abnormal state indicates that the abnormal state of the cooling system is an abnormal state not caused by the coolant.

4. The method according to claim 1, characterized in that: The target parameter is the voltage change rate; The determining, based on the first temperature and the target parameter, an abnormal state of the cooling system includes: When the first temperature is greater than a first temperature threshold and the voltage change rate is less than or equal to a preset change rate, it is determined that the cooling system has a third abnormal state, and the third abnormal state is characterized by a volume of the coolant being within a second preset volume range, and the second preset volume range is less than the second preset volume and greater than or equal to the third preset volume.

5. The method according to claim 4, characterized in that The determining, based on the first temperature and the target parameter, an abnormal state of the cooling system includes: When the first temperature is greater than the first temperature threshold and the voltage change rate is greater than the preset change rate, it is determined that the cooling system has a fourth abnormal state and the fuel cell is stopped. The fourth abnormal state indicates that the volume of the coolant is within a third preset volume range, and the third preset volume range is smaller than the third preset volume.

6. The method according to claim 4, characterized in that After determining that the cooling system is in a third abnormal state, the method further includes: When the average voltage of the battery stack is less than the second voltage threshold, it is determined that the cooling system is in a fourth abnormal state, and the fourth abnormal state indicates that the volume of the coolant is within a third preset volume range, and the third preset volume range is smaller than the third preset volume.

7. The method according to claim 2 or 4, characterized in that: The method further comprises: reducing the operating power of the fuel cell; When it is determined that the first temperature is continuously greater than the first temperature threshold within a first preset time period, the fuel cell is stopped from operating.

8. The method according to claim 2, characterized in that: The method further comprises: reducing the operating power of the fuel cell; When the duration of the first abnormal state in the cooling system reaches a second preset duration, a prompt message is sent, where the prompt message is used to instruct to check the cooling system.

9. A cooling system abnormality detection device, characterized in that: The cooling system abnormality detection device comprises: an acquisition module and a processing module; The acquisition module is used to acquire the voltage difference, the first temperature and the target parameter of the stack in the fuel cell, wherein the target parameter is any one of the following: the second temperature, the voltage change rate, the voltage difference of the stack is the voltage difference between the multiple battery cells included in the stack, the first temperature is the temperature of the coolant in the cooling system of the fuel cell when it flows into the stack, the second temperature is the temperature of the coolant when it flows out of the stack, and the voltage change rate is the rate of decrease of the average voltage of the stack; The processing module is used to determine the abnormal state of the cooling system based on the first temperature and the target parameter when the voltage difference of the fuel cell stack is greater than a first voltage threshold.

10. An electronic device, characterized in that: include: processor; a memory for storing instructions executable by the processor; The processor is configured to execute the instructions to implement the method according to any one of claims 1 to 8.

11. A cooling system abnormality detection system, characterized in that: The cooling system abnormality detection system includes a controller and a fuel cell, the fuel cell includes a fuel cell stack and a cooling system, and the cooling system abnormality detection system is used to implement the method as described in any one of claims 1-8.

12. A vehicle, characterized in that: The vehicle comprises the cooling system abnormality detection device according to claim 9, and the vehicle is used to implement the method according to any one of claims 1-8.

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