Fuel cell system, control method and device thereof and medium

Abstract

The invention discloses a fuel cell system, a control method and device thereof and a medium, the fuel cell system comprises an electric pile, a dehumidifier is arranged in the electric pile, and the method comprises the following steps: when the electric pile is shut down after operation, acquiring an environment temperature and an internal temperature and internal humidity of the electric pile; according to the internal temperature and the internal humidity, based on a preset dew-point temperature detection model, the dew-point temperature in the galvanic pile is determined, and the dew-point temperature is the critical temperature at which gas in the galvanic pile is converted into liquid; if the dew-point temperature is greater than or equal to the environment temperature, controlling a dehumidifier to dehumidify the interior of the galvanic pile, and re-determining the dew-point temperature in the dehumidification process; and after the dew point temperature is smaller than the environment temperature, the dehumidifier is controlled to stop dehumidification. The insulation performance of the galvanic pile can be ensured, and the insulation efficiency is improved.

Description

Technical Field

[0001] The present application belongs to the field of fuel cell system detection technology, and in particular, relates to a fuel cell system and a control method, device and medium thereof. Background Art

[0002] The coolant of the fuel cell system is used to cool the bipolar plates and positive and negative electrodes of the stack. Since the coolant is a charged body, the cooling circuit of the stack needs to be insulated to ensure the safe and stable operation of the stack.

[0003] Currently, after a fuel cell stack stops operating, the inside of the fuel cell stack is usually purged or dehumidified for a certain period of time to expel water vapor inside the fuel cell stack and ensure the insulation performance of the fuel cell stack. However, purging or dehumidifying for a certain period of time may not guarantee effective insulation. Summary of the invention

[0004] The embodiments of the present application provide a fuel cell system and a control method, device and medium thereof, thereby being able to ensure the insulation performance of the fuel cell stack at least to a certain extent and improve the insulation efficiency.

[0005] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by the practice of the present application.

[0006] In a first aspect, the present application provides a control method for a fuel cell system, wherein the fuel cell system includes a fuel cell stack, wherein a dehumidifier is provided in the fuel cell stack, and the method includes:

[0007] When the battery stack is shut down after operation, obtaining the ambient temperature and the internal temperature and internal humidity of the battery stack;

[0008] Determining the dew point temperature inside the fuel cell stack according to the internal temperature and the internal humidity based on a preset dew point temperature detection model, wherein the dew point temperature is a critical temperature at which gas in the fuel cell stack is converted into liquid;

[0009] If the dew point temperature is greater than or equal to the ambient temperature, controlling the dehumidifier to dehumidify the interior of the fuel cell stack, and re-determining the dew point temperature during the dehumidification process;

[0010] After the dew point temperature is lower than the ambient temperature, the dehumidifier is controlled to stop dehumidification.

[0011] Optionally, the dew point temperature detection model is as follows:

[0012]

[0013] Among them, T drepresents the dew point temperature, f represents the indoor humidity, t represents the indoor temperature, and a and b represent constants.

[0014] Optionally, after the dew point temperature is lower than the ambient temperature, the method further includes:

[0015] Get the lowest ambient temperature in the future;

[0016] If the dew point temperature is greater than or equal to the minimum ambient temperature, controlling the dehumidifier to continue dehumidifying the interior of the fuel cell stack, and re-determining the dew point temperature during the dehumidification process;

[0017] If the dew point temperature is lower than the minimum ambient temperature, the step of controlling the dehumidifier to stop dehumidification is performed.

[0018] Optionally, the fuel cell system further comprises:

[0019] The purge component and / or the heat dissipation component, when the dew point temperature is greater than or equal to the ambient temperature, the method further comprises:

[0020] Controlling the purge component to purge the interior of the battery stack until the purge duration reaches a first duration, and then controlling the purge component to stop purge; and / or

[0021] The heat dissipation component is controlled to dissipate heat inside the battery stack until the heat dissipation time reaches a second time, and then the heat dissipation component is controlled to stop dissipating heat.

[0022] Optionally, the fuel cell system further comprises: a purge assembly, and during the operation of the fuel cell stack, the method further comprises:

[0023] Detecting the insulation value of the battery stack;

[0024] If the insulation value is less than or equal to the first insulation value, controlling the stack to shut down;

[0025] If the insulation value is greater than the first insulation value and less than or equal to the second insulation value, the purge component is controlled to purge the inside of the battery stack, and the insulation value is re-tested during the purge process until the insulation value is greater than the second insulation value, and the purge component is controlled to stop purge.

[0026] Optionally, the fuel cell system further includes: a purge component, and when the fuel cell stack is started, the method further includes:

[0027] Detecting the insulation value of the battery stack;

[0028] If the insulation value is less than or equal to the first insulation value, the dehumidifier is controlled to dehumidify the interior of the battery stack, and the insulation value is re-detected during the dehumidification process until the insulation value is greater than the first insulation value, and the dehumidifier is controlled to stop dehumidification;

[0029] If the insulation value is greater than the first insulation value and less than or equal to the second insulation value, the purge component is controlled to purge the inside of the battery stack, and the insulation value is re-tested during the purge process until the insulation value is greater than the second insulation value, and the purge component is controlled to stop purge.

[0030] Optionally, the purge assembly is connected to the fuel cell stack via an air supply pipeline, a control valve is provided on the air supply pipeline, and controlling the purge assembly to purge the interior of the fuel cell stack includes:

[0031] The opening of the control valve is controlled to be greater than or equal to a preset opening so that the purge flow provided by the purge assembly through the gas supply pipeline is greater than or equal to a preset flow to purge the inside of the fuel cell stack, wherein the preset opening has a value range of 80%-100%.

[0032] A second aspect of an embodiment of the present application provides a control device for a fuel cell system, wherein the fuel cell system includes a fuel cell stack, wherein a dehumidifier is provided in the fuel cell stack, and the device includes:

[0033] An acquisition unit, used to acquire the ambient temperature and the internal temperature and internal humidity of the fuel cell stack when the fuel cell stack is shut down after operation;

[0034] a determination unit, configured to determine the dew point temperature inside the fuel cell stack according to the internal temperature and the internal humidity and based on a preset dew point temperature detection model, wherein the dew point temperature is a critical temperature at which gas in the fuel cell stack is converted into liquid;

[0035] a first control unit, configured to control the dehumidifier to dehumidify the interior of the fuel cell stack if the dew point temperature is greater than or equal to the ambient temperature, and to redetermine the dew point temperature during the dehumidification process;

[0036] The second control unit is used to control the dehumidifier to stop dehumidification after the dew point temperature is lower than the ambient temperature.

[0037] A third aspect of an embodiment of the present application provides a fuel cell system, comprising:

[0038] A fuel cell stack, wherein a dehumidifier is provided inside the fuel cell stack;

[0039] A purge assembly, wherein the purge assembly is connected to the fuel cell stack via an air supply pipeline, and a control valve is provided on the air supply pipeline;

[0040] An insulation monitor, which is used to monitor the insulation value of the battery stack;

[0041] A controller, wherein the controller is used to execute any method as described in the first aspect.

[0042] A fourth aspect of an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores at least one computer program instruction, and the at least one computer program instruction is loaded and executed by a processor to implement the operations performed by any of the methods described in the first aspect.

[0043] According to the fifth aspect of an embodiment of the present application, an electronic device is provided, comprising one or more processors and one or more memories, wherein at least one program code is stored in the one or more memories, and the at least one program code is loaded and executed by the one or more processors to implement the operations performed by any of the methods described in the first aspect.

[0044] One or more technical solutions provided by the embodiments of the present invention achieve at least the following technical effects or advantages:

[0045] When the stack is shut down after operation, the embodiment of the present application obtains the ambient temperature and the internal temperature and internal humidity of the stack; according to the internal temperature and internal humidity, based on the preset dew point temperature detection model, the dew point temperature inside the stack is determined, and the dew point temperature is the critical temperature at which the gas in the stack is converted into liquid; if the dew point temperature is greater than or equal to the ambient temperature, the dehumidifier is controlled to dehumidify the inside of the stack, and the dew point temperature is re-determined during the dehumidification process; after the dew point temperature is lower than the ambient temperature, the dehumidifier is controlled to stop dehumidification. Therefore, since the dew point temperature is lower than the ambient temperature, it can be ensured that the high-temperature and high-humidity gas after the stack is shut down will not condense in the stack, thereby ensuring the insulation performance of the stack and improving the insulation efficiency.

[0046] 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

[0047] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0048] Figure 1 A schematic structural diagram of a fuel cell system according to an embodiment of the present application is shown;

[0049] Figure 2 A schematic diagram showing the positional relationship between the core and the dehumidifier in an embodiment of the present application is shown;

[0050] Figure 3 A flow chart showing a method for controlling a fuel cell system according to an embodiment of the present application is shown;

[0051] Figure 4 Another flow chart showing a method for controlling a fuel cell system according to an embodiment of the present application;

[0052] Figure 5 Another structural schematic diagram of a fuel cell system according to an embodiment of the present application is shown;

[0053] Figure 6 Another flow chart showing a control method of a fuel cell system according to an embodiment of the present application;

[0054] Figure 7 A structural diagram of a control device of a fuel cell system according to an embodiment of the present application is shown.

[0055] Figure 8 A schematic diagram of the structure of a computer system suitable for implementing an electronic device of an embodiment of the present application is shown.

[0056] 1-air filter; 2-air flow meter; 3-air compressor; 4-intercooler; 5-humidity control valve; 6-humidifier; 7-air inlet stop valve; 8-air inlet temperature and pressure sensor; 9-air outlet temperature and pressure sensor; 10-air outlet stop valve; 11-back pressure valve; 12-leakage valve; 13-mixed discharge; 14-fuel cell; 15-core; 16-air inlet; 17-air outlet; 18-air inlet pipeline; 181-first branch; 182-second branch; 19 1-first air outlet pipeline; 192-second air outlet pipeline; 21-three-way valve; 22-inlet valve; 23-outlet valve; 24-dehumidifier; 25-temperature and humidity integrated sensor; 26-temperature sensor; 28-purge pipeline; 29-exhaust pipeline; 31-purge air inlet; 32-purge air outlet; 33-exhaust outlet; 34-air inlet; 35-air outlet; 36-water collection tray; 37-semiconductor electronic refrigeration chip; 38-battery power supply; 39-low-pressure fan. DETAILED DESCRIPTION

[0057] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0058] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present application. However, those skilled in the art will appreciate that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, known methods, devices, realizations or operations are not shown or described in detail to avoid blurring the various aspects of the present application.

[0059] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0060] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0061] It should also 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 objects used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those shown or described.

[0062] It should be noted that the coolant of the fuel cell system is used to cool the bipolar plates and positive and negative electrodes of the stack. Since the coolant is a charged body, the cooling circuit of the stack needs to be insulated to ensure the safe and stable operation of the stack.

[0063] At present, after the fuel cell stack stops operating, the inside of the fuel cell stack is usually purged or dehumidified for a certain period of time to expel the water vapor inside the fuel cell stack and ensure the insulation performance of the fuel cell stack. However, when purging or dehumidifying for a certain period of time, only the gas volume and humidity in the fuel cell stack are considered, but the effect of temperature on the gas is not considered. When there is a temperature difference between the gas temperature inside the fuel cell stack and the ambient temperature, condensation may occur inside the fuel cell stack, causing the liquid to affect the insulation of the fuel cell stack, and effective insulation cannot be guaranteed.

[0064] In view of this, a first aspect of an embodiment of the present application provides a control method for a fuel cell system, which can ensure the insulation performance of the fuel cell stack to a certain extent and improve the insulation efficiency.

[0065] The control method of the fuel cell system according to the embodiment of the present application is described in detail below with reference to the accompanying drawings.

[0066] See also Figure 1 , showing a schematic structural diagram of a fuel cell system according to an embodiment of the present application; see Figure 2 , showing a schematic diagram of the positional relationship between the core and the dehumidifier of an embodiment of the present application.

[0067] like Figure 1 As shown, the fuel cell system includes a fuel cell stack 14, and the fuel cell stack 14 is provided with an air inlet 16 and an air outlet 17. An air filter 1, an air flow meter 2, an air compressor 3, an intercooler 4, a humidifier 6, and an air inlet temperature and pressure sensor 8 are sequentially arranged on an intake pipe 18 connected to the air inlet 16, wherein the air filter 1 is farther away from the air inlet 16 than the air inlet temperature and pressure sensor 8, and a first branch 181 and a second branch 182 are arranged on the intake pipe 18 between the intercooler 4 and the humidifier 6, a humidity regulating valve 5 is arranged on the first branch 181, and a discharge valve 12 is arranged on the second branch 182. An air outlet temperature and pressure sensor 9 and an air outlet shut-off valve 10 are provided on the first air outlet pipeline 191 connected to the air outlet 17. The first air outlet pipeline 191 is connected to the humidifier 6. The humidifier 6 is also provided with a second air outlet pipeline 192. The second air outlet pipeline 192 is connected to the mixing device 13. The mixing device 13 is also connected to the second branch 182.

[0068] In order to purge the gas inside the stack 14, the stack 14 is also provided with a purge air inlet 31, and a three-way valve 21 is provided on the air inlet pipe 18 between the air compressor 3 and the intercooler 4. The three-way valve 21 is connected to the purge air inlet 31 through a purge pipe 28. The purge pipe 28 is also provided with an air inlet valve 22 near the purge air inlet 31, so that the air compressor 3 can purge the inside of the stack 14 through the purge pipe 28. The stack 14 is provided with an exhaust port 33, and the purged gas can be discharged to the mixed discharge 13 through an exhaust pipe 29 connected to the exhaust port 33, and an exhaust valve 23 is provided on the exhaust pipe 29.

[0069] Combination Figure 1 and Figure 2In order to dehumidify the inside of the battery stack 14, a dehumidifier 24 close to the core 15 is also provided inside the battery stack 14. The dehumidifier 24 can be a 24 / 12V powered semiconductor cooling sheet, which can be embedded in the circulating air duct of the battery stack 14. The circulating air duct includes an air inlet 34 and an air outlet 35. The air inlet 34 is provided with a low-pressure fan 39. The semiconductor cooling sheet includes an A surface and a B surface, wherein the A surface is a cooling surface and faces the core 15 and is located inside the circulating air duct, and the B surface is a heating surface and is arranged toward the shell (for example, it is arranged in contact with the shell, so as to use the metal shell for heat dissipation). A water collecting tray 36 is also arranged outside the semiconductor cooling sheet. After the power is connected, the low-pressure fan 39 transports the gas in the shell of the battery stack 14 to the inside of the dehumidifier 24. During the circulation of the gas between the air outlet 35 and the air inlet 34, the gas flows through the surface A of the refrigeration plate, and liquid droplets will condense on the surface A and drip into the water collection tray 36 below, and then be discharged into the exhaust pipe 29 through the drain port.

[0070] The following describes the implementation of the control method of the fuel cell system according to the embodiment of the present application in combination with the above-mentioned fuel cell system structure.

[0071] See also Figure 3 , showing a flow chart of a control method for a fuel cell system according to an embodiment of the present application.

[0072] In a first aspect, the present application provides a control method for a fuel cell system, wherein the fuel cell system includes a fuel cell stack 14, wherein a dehumidifier 24 is provided in the fuel cell stack 14, wherein the method may be executed in a controller, wherein the controller may be independently provided from the fuel cell system or may be provided inside the fuel cell system, and wherein the method includes but is not limited to:

[0073] Step S101. When the battery stack 14 stops running, obtain the ambient temperature and the internal temperature and internal humidity of the battery stack 14;

[0074] It is understandable that after the operation of the battery stack 14, the interior of the battery stack 14 is in a high temperature and high humidity state. When the shell of the battery stack 14 is cooled by the ambient temperature and the shell temperature drops, the high temperature and high humidity gas in the cavity is likely to condense on the inner wall of the shell, and the condensation will cause the insulation performance of the battery stack 14 to decrease and the shell of the battery stack 14 to rust. Therefore, when the battery stack 14 is shut down after operation, the embodiment of the present application intends to determine whether to dehumidify the interior of the battery stack 14 based on the ambient temperature, the internal temperature of the battery stack 14, and the internal humidity to ensure the insulation performance of the battery stack 14.

[0075] Exemplarily, the ambient temperature may be detected by an ambient temperature sensor 26 , and the internal temperature and internal humidity of the battery stack 14 may be detected by a temperature and humidity sensor.

[0076] Step S102. According to the internal temperature and the internal humidity, based on a preset dew point temperature detection model, determine the dew point temperature inside the battery stack 14, wherein the dew point temperature is a critical temperature at which the gas in the battery stack 14 is converted into liquid;

[0077] It can be understood that when the internal temperature of the battery stack 14 is lower than the ambient temperature, the gas will condense on the inner wall and turn into liquid droplets when passing through the inner wall of the shell. Therefore, the critical temperature at which the gas in the battery stack 14 is converted into liquid is called the dew point temperature in the embodiment of the present application. The influence of the internal temperature and internal humidity of the battery stack 14 on the dew point temperature is comprehensively considered, and a preset dew point temperature detection model is established, so that the dew point temperature after the battery stack 14 is shut down can be determined based on the dew point temperature detection model.

[0078] In some embodiments, the dew point temperature detection model is as follows:

[0079]

[0080] Among them, T d represents the dew point temperature, f represents the indoor humidity, t represents the indoor temperature, a and b represent constants, a=7.5, b=237.3.

[0081] Step S103. If the dew point temperature is greater than or equal to the ambient temperature, the dehumidifier 24 is controlled to dehumidify the interior of the battery stack 14, and the dew point temperature is re-determined during the dehumidification process;

[0082] For example: if the ambient temperature is 25 degrees and the dew point temperature is 30 degrees, the dew point temperature is greater than the ambient temperature, indicating that the gas in the battery stack 14 will condense inside the battery stack 14 to form droplets, thereby affecting the insulation performance. In this case, the embodiment of the present application dehumidifies the inside of the battery stack 14 by controlling the dehumidifier 24. At this time, the gas in the battery stack 14 is transported to the inside of the dehumidifier 24 under the action of the low-pressure fan 39. During the circulation of the gas between the air outlet 35 and the air inlet 34, the gas flows through the A surface of the dehumidifier 24 (refrigeration plate), and the A surface will condense droplets, dripping into the water collection tray 36 below, and then discharged into the exhaust pipe 29 through the drain port. As a result, the water vapor in the gas is reduced, thereby reducing the possibility of water vapor entering the battery stack 14.

[0083] Step S104: After the dew point temperature is lower than the ambient temperature, control the dehumidifier 24 to stop dehumidification.

[0084] It can be understood that after the dew point temperature is lower than the ambient temperature, even if the gas in the fuel cell stack 14 still carries water vapor, when the gas passes through the inner wall of the fuel cell stack 14 shell, the dew point temperature is lowered, that is, the internal temperature of the fuel cell stack 14 is lower than the external ambient temperature. Therefore, the gas will not liquefy on the inner wall of the shell to form condensation, thereby ensuring the insulation performance of the fuel cell stack 14.

[0085] Based on the above, when the stack 14 is shut down after operation, the embodiment of the present application obtains the ambient temperature and the internal temperature and internal humidity of the stack 14; according to the internal temperature and internal humidity, based on the preset dew point temperature detection model, the dew point temperature inside the stack 14 is determined, and the dew point temperature is the critical temperature at which the gas in the stack 14 is converted into liquid; if the dew point temperature is greater than or equal to the ambient temperature, the dehumidifier 24 is controlled to dehumidify the inside of the stack 14, and the dew point temperature is re-determined during the dehumidification process; after the dew point temperature is less than the ambient temperature, the dehumidifier 24 is controlled to stop dehumidification. Therefore, since the dew point temperature is less than the ambient temperature, it can be ensured that the high-temperature and high-humidity gas after the stack 14 is shut down will not condense in the stack 14, thereby ensuring the insulation performance of the stack 14 and improving the insulation efficiency.

[0086] In some embodiments, after the dew point temperature is less than the ambient temperature, the method further includes:

[0087] Step S31. Obtain the lowest ambient temperature within a period of time in the future;

[0088] For example: Get the lowest ambient temperature in the next 8 hours, 12 hours, or 24 hours. For example, the lowest ambient temperature in the next 24 hours is 10 degrees.

[0089] Step S32. If the dew point temperature is greater than or equal to the minimum ambient temperature, the dehumidifier 24 is controlled to continue to dehumidify the inside of the battery stack 14, and the dew point temperature is re-determined during the dehumidification process;

[0090] It is understandable that after the humidity inside the battery stack 14 is reduced by the dehumidifier 24, it is possible that the gas inside the battery stack 14 still contains a small amount of water vapor. If the ambient temperature decreases in the future, it is still possible that the gas inside the battery stack 14 will liquefy and condense on the shell of the battery stack 14. Therefore, in order to further ensure the insulation performance of the battery stack 14 in the future, it is determined whether to continue to dehumidify the battery stack 14 by obtaining the lowest ambient temperature.

[0091] It is understandable that if the dew point temperature is greater than or equal to the minimum ambient temperature, it means that even at the minimum ambient temperature, the gas in the battery stack 14 may still liquefy and condense, thereby affecting the insulation performance of the battery stack 14. Therefore, it is necessary to reduce the dew point temperature to below the minimum ambient temperature, so that even if the external ambient temperature rises, the gas in the battery stack 14 will no longer condense, thereby ensuring the insulation performance of the battery stack 14.

[0092] Step S33: If the dew point temperature is lower than the minimum ambient temperature, the step of controlling the dehumidifier 24 to stop dehumidification is executed.

[0093] Exemplarily, when the battery stack 14 is dehumidified by the dehumidifier 24, the dehumidifier 24 can also be controlled to shut down based on the dehumidification time. For example, a dehumidification time T3 is pre-calibrated. It can be understood that the dehumidification time can basically ensure that after the dehumidifier 24 dehumidifies the battery stack 14, the dew point temperature drops to below the lowest ambient temperature for a period of time in the future. Then, when the dehumidification time Tc is greater than or equal to the dehumidification time T3, the dehumidifier 24 can be controlled to shut down.

[0094] It should be noted that, in the process of controlling the dehumidifier 24 to defrost the fuel cell stack 14 , the air inlet valve 22 and the air outlet valve 23 should be kept closed to ensure that the fuel cell stack 14 is in a closed dehumidified environment.

[0095] See also Figure 4 , shows another flow chart of the control method of the fuel cell system of an embodiment of the present application.

[0096] In some embodiments, the fuel cell system further includes: a purge assembly (including an air compressor 3, a three-way valve 21, a purge pipeline 28, an air inlet valve 22 and an air outlet valve 23) and / or a heat dissipation assembly (not shown). When the dew point temperature is greater than or equal to the ambient temperature, the method further includes:

[0097] Controlling the purge component to purge the interior of the battery stack 14 until the purge duration reaches a first duration, and then controlling the purge component to stop purge; and / or

[0098] The heat dissipation component is controlled to dissipate heat inside the battery stack 14 until the heat dissipation time reaches a second time, and then the heat dissipation component is controlled to stop dissipating heat.

[0099] It is understandable that when the fuel cell system is in a high-pressure state and the fuel-electric system has not failed or is not in a pure electric state, the inlet valve 22 and the outlet valve 23 are opened, and the three-way valve 21 is adjusted to a preset flow rate, such as N2. The air compressor 3 can introduce air into the battery stack 14 through the purge line 28 to purge the battery stack 14 for a purge time Te greater than or equal to the second time T4, such as 10 minutes, 15 minutes, etc. After reaching the second time, the air compressor 3 is turned off, the heat dissipation is stopped, and the inlet valve 22 and the outlet valve 23 are closed; similarly, the heat dissipation component can dissipate heat from the battery stack 14 shell for a third time, such as 10 minutes, 15 minutes, etc., to achieve rapid cooling.

[0100] See also Figure 5 , shows another structural schematic diagram of the fuel cell system of an embodiment of the present application.

[0101] exist Figure 5In the embodiment, the fuel cell stack 14 is connected in sequence with the DC / DC converter 105, the high-voltage distribution unit 106 (PDU) and the vehicle high voltage 103, and the high-voltage distribution unit 106 is also connected to the fuel cell system high voltage component 104. Among them, the first isolating switch K1, the second isolating switch K2 and the third isolating switch K3 and the resistor R1 are added between the high-voltage distribution unit 106 and the vehicle high voltage 103, and the pre-charging circuit is formed between the first isolating switch and the resistor R1. After the vehicle high voltage 103 is powered on, the K3 negative main switch and the K1 pre-charging switch are closed first. After the pre-charging is completed through the pre-charging circuit, K1 is disconnected and the K2 main positive switch is closed. When the insulation of the fuel cell system is abnormal, K2 and K3 can be disconnected, so that the high-voltage circuit of the fuel cell system is disconnected from the high voltage of the vehicle, ensuring the safety of the pure electrical insulation of the vehicle.

[0102] It is understandable that the DC / DC converter 105 is usually provided with a capacitor. After the high voltage of the whole vehicle is powered on, K3 and K1 are closed first, and before the battery stack 14 works, the capacitor is charged by the high voltage 103 of the whole vehicle, and then connected to the high voltage after the capacitor is fully charged, so as to ensure the safe operation of the battery stack 14.

[0103] In addition, an insulation monitor 107 is provided between the battery stack 14 and the DC / DC converter 105 to perform insulation monitoring on the battery stack 14 before K2 and K3 are closed, so that a corresponding insulation strategy (such as Figure 4 ), thereby improving insulation control efficiency.

[0104] See also Figure 4 and Figure 5 In some embodiments, the fuel cell system further comprises: a purge assembly. During the operation of the fuel cell stack 14, the method further comprises:

[0105] 1) Detecting the insulation value R of the battery stack 14;

[0106] 2) If the insulation value R is less than or equal to the first insulation value R1, the battery stack 14 is controlled to shut down;

[0107] 3) If the insulation value R is greater than the first insulation value R1 and less than or equal to the second insulation value R2, the purge component is controlled to purge the inside of the battery stack 14, and the insulation value is re-tested during the purge process until the insulation value R is greater than the second insulation value R2, and the purge component is controlled to stop purge.

[0108] It can be understood that the first insulation value R1 and the second insulation value R2 correspond to different insulation levels or performances of the battery stack 14, respectively, wherein the larger the insulation value, the better the insulation performance. When the insulation value is less than or equal to the first insulation value R1, it is considered that there is an insulation fault in the battery stack 14. At this time, the battery stack 14 is controlled to shut down to avoid safety accidents. When the insulation value is greater than the first insulation value R1 and less than the second insulation value R2, it is considered that there is an insulation warning. At this time, the three-way valve 21 can be adjusted to N2 flow to control the purge assembly to purge the inside of the battery stack 14, that is, to discharge the water vapor inside the battery stack 14 to restore the insulation performance, that is, the insulation alarm is eliminated. At this time, the three-way valve 21 can be adjusted to N1 flow, N1 is less than N2.

[0109] See also Figure 6 , shows another flow chart of the control method of the fuel cell system of an embodiment of the present application.

[0110] In some embodiments, the fuel cell system further includes: a purge assembly, and when the fuel cell stack 14 is turned on, the method further includes:

[0111] 1) Detecting the insulation value R of the battery stack 14;

[0112] 2) If the insulation value R is less than or equal to the first insulation value R1, the dehumidifier 24 is controlled to dehumidify the inside of the battery stack 14, and the insulation value is re-detected during the dehumidification process until the insulation value R is greater than the first insulation value R1, and the dehumidifier 24 is controlled to stop dehumidification;

[0113] 3) If the insulation value R is greater than the first insulation value R1 and less than or equal to the second insulation value R2, the purge component is controlled to purge the inside of the battery stack 14, and the insulation value R is re-detected during the purge process until the insulation value R is greater than the second insulation value R2, and the purge component is controlled to stop purge.

[0114] It is understandable that when the battery stack 14 is turned on, if the battery stack 14 is not in a high-voltage state and the insulation value is less than the first insulation value, it means that an insulation fault has occurred. At this time, the air inlet valve 22 and the air outlet valve 23 can be closed, and the dehumidifier 24 can be started. When the dehumidification time Ta is greater than or equal to the preset time T1, the dehumidifier 24 can be closed to improve the insulation performance. When the battery stack 14 is in a high-voltage state and the insulation value is less than or equal to the second insulation value, an insulation warning is issued, the air inlet valve 22 and the air outlet valve 23 are opened, the air compressor 3 is started, and the three-way valve 21 is adjusted to the N2 flow rate. When the purge time Tb is greater than or equal to the preset time T2, the air inlet valve 22 and the air outlet valve 23 are opened, and the three-way valve 21 is adjusted to the N1 flow rate, so that the insulation performance of the battery stack 14 is restored to ensure subsequent safe operation.

[0115] In some embodiments, the purge assembly is connected to the fuel cell stack 14 via an air supply pipeline, and a control valve (such as Figure 1 The three-way valve 21, the air inlet valve 22 and the air outlet valve 23 in the stack 14 are provided, and the control of the purge assembly to purge the inside of the stack 14 includes:

[0116] The opening of the control valve is controlled to be greater than or equal to a preset opening, so that the purge flow provided by the purge component through the air supply pipeline is greater than or equal to a preset flow, so as to purge the inside of the fuel cell stack 14, wherein the value range of the preset opening is: 80%-100%, for example 80%, 90%, 100%, etc.

[0117] It can be understood that when the opening of the control valve is greater than or equal to the preset opening, the purge flow rate can reach the N2 flow rate, that is, the fuel cell stack 14 is quickly purged with a high-intensity flow rate to quickly restore the insulation performance.

[0118] See also Figure 7 , showing a structural diagram of a control device of a fuel cell system according to an embodiment of the present application.

[0119] A second aspect of an embodiment of the present application provides a control device 200 for a fuel cell system, wherein the fuel cell system includes a fuel cell stack, wherein a dehumidifier is provided in the fuel cell stack, and the device 200 includes:

[0120] An acquisition unit 201 is used to acquire the ambient temperature and the internal temperature and internal humidity of the fuel cell stack when the fuel cell stack is shut down after operation;

[0121] A determination unit 202 is used to determine the dew point temperature inside the fuel cell stack according to the internal temperature and the internal humidity based on a preset dew point temperature detection model, where the dew point temperature is a critical temperature at which gas in the fuel cell stack is converted into liquid;

[0122] A first control unit 203 is configured to control the dehumidifier to dehumidify the interior of the fuel cell stack if the dew point temperature is greater than or equal to the ambient temperature, and to redetermine the dew point temperature during the dehumidification process;

[0123] The second control unit 204 is used to control the dehumidifier to stop dehumidification after the dew point temperature is lower than the ambient temperature.

[0124] A third aspect of an embodiment of the present application provides a fuel cell system, comprising:

[0125] A fuel cell stack, wherein a dehumidifier is provided inside the fuel cell stack;

[0126] A purge assembly, wherein the purge assembly is connected to the fuel cell stack via an air supply pipeline, and a control valve is provided on the air supply pipeline;

[0127] An insulation monitor, which is used to monitor the insulation value of the battery stack;

[0128] A controller, wherein the controller is used to execute any method as described in the first aspect.

[0129] According to a fourth aspect of an embodiment of the present application, a computer-readable storage medium is provided, in which at least one computer program instruction is stored. The at least one computer program instruction is loaded and executed by a processor to implement the operations performed by any method described in the first aspect.

[0130] The computer readable storage medium may be a portable compact disk read-only memory (CD-ROM) and include program code, and may be run on a terminal device, such as a personal computer. However, the computer readable storage medium of the present application is not limited thereto, and in the present application, the readable storage medium may be any tangible medium containing or storing a program, which may be used by or in combination with an instruction execution system, apparatus, or device.

[0131] The readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination thereof. More specific examples of readable storage media (a non-exhaustive list) include: an electrical connection with one or more conductors, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof.

[0132] Program code for performing the operations of the present application may be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Java, C++, etc., and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, as a separate software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server. In the case of a remote computing device, the remote computing device may be connected to the user computing device through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computing device (e.g., via the Internet using an Internet service provider).

[0133] See also Figure 8 , which is a schematic diagram of the structure of a computer system suitable for implementing an electronic device of an embodiment of the present application.

[0134] According to the fifth aspect of an embodiment of the present application, an electronic device is provided, comprising one or more processors and one or more memories, wherein at least one program code is stored in the one or more memories, and the at least one program code is loaded and executed by the one or more processors to implement operations performed by any method of the first aspect.

[0135] like Figure 8 As shown, the electronic device 400 is in the form of a general computing device. The components of the electronic device 400 may include but are not limited to: at least one processing unit 410, at least one storage unit 420, and a bus 430 connecting different system components (including the storage unit 420 and the processing unit 410).

[0136] The storage unit stores program codes, which can be executed by the processing unit 410, so that the processing unit 410 executes the steps described in the above “Embodiment Method” section of this specification according to various exemplary implementations of the present application.

[0137] The storage unit 420 may include a readable medium in the form of a volatile storage unit, such as a random access memory unit (RAM) 421 and / or a cache 422 , and may further include a read-only memory unit (ROM) 423 .

[0138] The storage unit 420 may also include a program / utility 424 having a set (at least one) of program modules 425, such program modules 425 including but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment.

[0139] Bus 430 may represent one or more of several types of bus structures, including a memory unit bus or memory unit controller, a peripheral bus, an accelerated graphics port, a processing unit, or a local bus using any of a variety of bus architectures.

[0140] The electronic device 400 may also communicate with one or more external devices 500 (e.g., keyboards, pointing devices, Bluetooth devices, etc.), may also communicate with one or more devices that enable a user to interact with the electronic device 400, and / or communicate with any device that enables the electronic device 400 to communicate with one or more other computing devices (e.g., routers, modems, etc.). Such communication may be performed through an I / O (input / output) interface 450, wherein the I / O interface 450 may also be connected to a display unit 440 to display the communication content through the display unit 440. In addition, the electronic device 400 may also communicate with one or more networks (e.g., a local area network (LAN), a wide area network (WAN), and / or a public network, such as the Internet) through a network adapter 460. As shown in the figure, the network adapter 460 communicates with other modules of the electronic device 400 through the bus 430. It should be understood that, although not shown in the figure, other hardware and / or software modules may be used in conjunction with the electronic device 400, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0141] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored as one or more instructions or codes on a computer-readable medium or transmitted via a computer-readable medium. Other examples and implementations are within the scope and spirit of the present invention and the appended claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hard wiring, or a combination of any of these. In addition, each functional unit may be integrated into a processing unit, each unit may exist physically separately, or two or more units may be integrated into one unit.

[0142] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, 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 units or modules, which can be electrical or other forms.

[0143] The units described as separate components may or may not be physically separated, and the components of the control device may or may not be physical units, that is, they may be located in one place or distributed in multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0144] 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 computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk, etc., which can store program code.

[0145] The above description is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of the claims of the present application.

Claims

1. A control method for a fuel cell system, characterized in that: The fuel cell system includes a fuel cell stack, a dehumidifier is provided in the fuel cell stack, and the method includes: When the battery stack is shut down after operation, obtaining the ambient temperature and the internal temperature and internal humidity of the battery stack; Determining the dew point temperature inside the fuel cell stack according to the internal temperature and the internal humidity based on a preset dew point temperature detection model, wherein the dew point temperature is a critical temperature at which gas in the fuel cell stack is converted into liquid; If the dew point temperature is greater than or equal to the ambient temperature, controlling the dehumidifier to dehumidify the interior of the fuel cell stack, and re-determining the dew point temperature during the dehumidification process; After the dew point temperature is lower than the ambient temperature, the dehumidifier is controlled to stop dehumidification.

2. The method according to claim 1, characterized in that The dew point temperature detection model is as follows: Among them, T d represents the dew point temperature, f represents the indoor humidity, t represents the indoor temperature, and a and b represent constants.

3. The method according to claim 1, characterized in that After the dew point temperature is less than the ambient temperature, the method further includes: Get the lowest ambient temperature in the future; If the dew point temperature is greater than or equal to the minimum ambient temperature, controlling the dehumidifier to continue dehumidifying the interior of the fuel cell stack, and re-determining the dew point temperature during the dehumidification process; If the dew point temperature is lower than the minimum ambient temperature, the step of controlling the dehumidifier to stop dehumidification is performed.

4. The method according to claim 1, characterized in that: The fuel cell system further includes: a purge component and / or a heat dissipation component. When the dew point temperature is greater than or equal to the ambient temperature, the method further includes: Controlling the purge component to purge the interior of the battery stack until the purge duration reaches a first duration, and then controlling the purge component to stop purge; and / or The heat dissipation component is controlled to dissipate heat inside the battery stack until the heat dissipation time reaches a second time, and then the heat dissipation component is controlled to stop dissipating heat.

5. The method according to claim 1, characterized in that The fuel cell system further includes: a purge assembly. During the operation of the fuel cell stack, the method further includes: Detecting the insulation value of the battery stack; If the insulation value is less than or equal to the first insulation value, controlling the stack to shut down; If the insulation value is greater than the first insulation value and less than or equal to the second insulation value, the purge component is controlled to purge the inside of the battery stack, and the insulation value is re-tested during the purge process until the insulation value is greater than the second insulation value, and the purge component is controlled to stop purge.

6. The method according to claim 1, characterized in that The fuel cell system further includes: a purge assembly. When the fuel cell stack is started, the method further includes: Detecting the insulation value of the battery stack; If the insulation value is less than or equal to the first insulation value, the dehumidifier is controlled to dehumidify the interior of the battery stack, and the insulation value is re-detected during the dehumidification process until the insulation value is greater than the first insulation value, and the dehumidifier is controlled to stop dehumidification; If the insulation value is greater than the first insulation value and less than or equal to the second insulation value, the purge component is controlled to purge the inside of the battery stack, and the insulation value is re-tested during the purge process until the insulation value is greater than the second insulation value, and the purge component is controlled to stop purge.

7. The method according to claim 5 or 6, characterized in that: The purge assembly is connected to the fuel cell stack via an air supply pipeline, and a control valve is provided on the air supply pipeline. The purge assembly is controlled to purge the interior of the fuel cell stack, including: The opening of the control valve is controlled to be greater than or equal to a preset opening so that the purge flow provided by the purge assembly through the gas supply pipeline is greater than or equal to a preset flow to purge the inside of the fuel cell stack, wherein the preset opening has a value range of 80%-100%.

8. A control device for a fuel cell system, characterized in that: The fuel cell system includes a fuel cell stack, a dehumidifier is provided in the fuel cell stack, and the device includes: An acquisition unit, used to acquire the ambient temperature and the internal temperature and internal humidity of the fuel cell stack when the fuel cell stack is shut down after operation; a determination unit, configured to determine the dew point temperature inside the fuel cell stack according to the internal temperature and the internal humidity and based on a preset dew point temperature detection model, wherein the dew point temperature is a critical temperature at which gas in the fuel cell stack is converted into liquid; a first control unit, configured to control the dehumidifier to dehumidify the interior of the fuel cell stack if the dew point temperature is greater than or equal to the ambient temperature, and to redetermine the dew point temperature during the dehumidification process; The second control unit is used to control the dehumidifier to stop dehumidification after the dew point temperature is lower than the ambient temperature.

9. A fuel cell system, characterized in that: include: A fuel cell stack, wherein a dehumidifier is provided inside the fuel cell stack; A purge assembly, wherein the purge assembly is connected to the fuel cell stack via an air supply pipeline, and a control valve is provided on the air supply pipeline; An insulation monitor, which is used to monitor the insulation value of the battery stack; A controller, wherein the controller is used to execute the method according to any one of claims 1 to 7.

10. A computer-readable storage medium, wherein at least one computer program instruction is stored in the computer-readable storage medium, wherein the at least one computer program instruction is loaded and executed by a processor to implement the operations performed by the method according to any one of claims 1 to 7.

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