Fuel cell temperature and humidity regulation and control system and regulation and control method

Abstract

The invention provides a fuel cell temperature and humidity regulation and control system and method, the fuel cell temperature and humidity regulation and control system comprises a gas supply device, a humidifier, a first intercooler and a second intercooler, the gas supply device is connected with a gas supply pipeline, the gas supply pipeline is used for being connected with an electric pile, the humidifier is arranged on the gas supply pipeline, the first intercooler is arranged on the gas supply pipeline, and the second intercooler is arranged on the gas supply pipeline. The first intercooler is arranged on the air supply pipeline and located between the air supply device and the humidifier, and the second intercooler is arranged on the air supply pipeline and located between the humidifier and the electric pile. In the fuel cell temperature and humidity regulation and control system, the temperature of the gas supplied by the gas supply pipeline is firstly regulated by the first intercooler, then the humidity of the gas is regulated by the humidifier, and the temperature of the gas is regulated by the second intercooler, so that the temperature of the gas is influenced due to heat exchange of the gas in the humidifier; therefore, the temperature of the gas can meet the requirement through the second intercooler, so that the temperature and humidity of the gas supplied to the electric pile can meet the requirement.

Description

Technical Field

[0001] The present invention relates to the field of fuel cells, and in particular to a fuel cell temperature and humidity control system and control method. Background Art

[0002] In the related art, the temperature and humidity control system of the fuel cell includes an intercooler and a humidifier. The gas first passes through the intercooler to adjust the temperature, then passes through the humidifier to adjust the humidity, and finally is supplied to the fuel cell stack. However, there is a difference between the actual temperature and humidity of the gas entering the fuel cell stack and the required temperature and humidity. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art to at least a certain extent. To this end, an embodiment of the present invention provides a fuel cell temperature and humidity control system, which can effectively adjust the temperature and humidity of the gas entering the fuel cell stack to meet the needs of the fuel cell stack.

[0004] The embodiment of the present invention further provides a method for controlling the temperature and humidity of a fuel cell.

[0005] The fuel cell temperature and humidity control system of the embodiment of the present invention includes:

[0006] A gas supply device, the gas supply device is connected to a gas supply pipeline, and the gas supply pipeline is used to connect to the fuel cell stack;

[0007] A humidifier, wherein the humidifier is arranged on the air supply pipeline;

[0008] a first intercooler, the first intercooler being arranged on the air supply pipeline and located between the air supply device and the humidifier;

[0009] A second intercooler is provided on the air supply pipeline and is located between the humidifier and the fuel cell stack.

[0010] The fuel cell temperature and humidity control system of the embodiment of the present invention is provided with a first intercooler, a humidifier and a second intercooler in sequence along the gas supply direction on the gas supply pipeline connected to the gas supply device. The gas supplied by the gas supply pipeline first passes through the first intercooler and has its temperature adjusted by the first intercooler, then passes through the humidifier and has its humidity adjusted by the humidifier, and then passes through the second intercooler and has its temperature adjusted by the second intercooler. Since the gas also exchanges heat in the humidifier and affects the temperature of the gas, the second intercooler can be used to ensure that the temperature of the gas meets the requirements, thereby ensuring that the temperature and humidity of the gas supplied to the fuel cell stack meet the requirements.

[0011] In some embodiments, the second intercooler includes a second liquid chamber and a second air chamber, the second liquid chamber is connected to the coolant outlet of the fuel cell stack, the second air chamber is connected to the air supply pipeline, and the coolant in the second liquid chamber and the gas in the second air chamber can exchange heat.

[0012] In some embodiments, the fuel cell temperature and humidity control system also includes a first multi-way valve, wherein the first valve port of the first multi-way valve is connected to the coolant outlet, the second valve port of the first multi-way valve is connected to the second liquid chamber, and the third valve port of the first multi-way valve is used to discharge the coolant.

[0013] In some embodiments, the first intercooler includes a first liquid cavity and a first air cavity, the coolant in the first liquid cavity and the gas in the first air cavity can exchange heat, and the first air cavity is connected to the air supply pipeline;

[0014] The fuel cell temperature and humidity control system also includes:

[0015] A liquid supply device, the liquid supply device is used to supply cooling liquid;

[0016] A second multi-way valve, wherein the first valve port of the second multi-way valve is connected to the liquid supply device, the second valve port of the second multi-way valve is connected to the coolant inlet of the fuel cell stack, and the third valve port of the second multi-way valve is connected to the first liquid chamber.

[0017] In some embodiments, the fuel cell temperature and humidity control system further includes a manifold, and the third valve port of the first multi-way valve, the outlet of the second liquid chamber, and the outlet of the first liquid chamber are all connected to the manifold.

[0018] In some embodiments, the humidifier includes a dry side chamber and a wet side chamber, the gas in the wet side chamber and the gas in the dry side chamber can exchange humidity, the dry side chamber is connected to the gas supply pipeline, and the wet side chamber is connected to the exhaust port of the fuel cell stack through an exhaust pipeline.

[0019] In some embodiments, the fuel cell temperature and humidity control system also includes an inlet shut-off valve and an outlet shut-off valve. The inlet shut-off valve is arranged on the gas supply pipeline and is located between the second intercooler and the fuel cell stack. The outlet shut-off valve is arranged on the exhaust pipeline and is located between the humidifier and the fuel cell stack.

[0020] In some embodiments, the fuel cell temperature and humidity control system further includes:

[0021] a first sensor, the first sensor acquiring a temperature of a coolant supplied to the first intercooler;

[0022] a second sensor, the second sensor acquiring a temperature of a coolant supplied to the second intercooler;

[0023] a third sensor, the third sensor acquiring temperature and humidity of the gas supplied to the fuel cell stack;

[0024] A fourth sensor is used to obtain the temperature of the gas supplied to the wet side chamber of the humidifier.

[0025] The fuel cell temperature and humidity control method of the embodiment of the present invention is implemented based on the fuel cell temperature and humidity control system described in any of the above embodiments, and the fuel cell temperature and humidity control method includes:

[0026] Obtaining the required water carrying capacity of the fuel cell stack;

[0027] adjusting the coolant flow rate of the first intercooler according to the temperature of the gas supplied to the wet side chamber of the humidifier and the temperature of the coolant supplied to the first intercooler, and adjusting the coolant flow rate of the second intercooler according to the temperature of the gas supplied to the wet side chamber of the humidifier and the temperature of the coolant supplied to the second intercooler;

[0028] After adjusting the coolant flow rates of the first intercooler and the second intercooler, obtaining the temperature and humidity of the gas supplied to the fuel cell stack, and obtaining the actual water carrying capacity of the fuel cell stack according to the temperature, humidity and flow rate of the gas supplied to the fuel cell stack;

[0029] Determine whether the actual water carrying capacity meets the required water carrying capacity. When the actual water carrying capacity does not meet the required water carrying capacity, couple and adjust the coolant flow of the first intercooler and the coolant flow of the second intercooler, then repeat the step of obtaining the actual water carrying capacity, and repeat the step of determining whether the actual water carrying capacity meets the required water carrying capacity until the actual water carrying capacity meets the required water carrying capacity.

[0030] The fuel cell temperature and humidity control method of the embodiment of the present invention adjusts the actual water carrying capacity by adjusting the coolant flow of the first intercooler and the second intercooler to ensure that the actual water carrying capacity meets the required water carrying capacity, thereby ensuring that the temperature and humidity of the gas supplied to the fuel cell stack meets the operating requirements of the fuel cell stack.

[0031] In some embodiments, the temperature of the gas supplied to the dry-side chamber of the humidifier and the temperature of the gas discharged from the dry-side chamber are obtained according to the temperature of the gas supplied to the wet-side chamber and the performance of the humidifier;

[0032] adjusting the coolant flow rate of the first intercooler according to the temperature of the coolant supplied to the first intercooler, the temperature of the gas supplied to the dry side chamber, and the performance of the first intercooler;

[0033] The coolant flow rate of the second intercooler is adjusted according to the temperature of the coolant supplied to the second intercooler, the temperature of the gas exhausted from the dry-side chamber, and the performance of the second intercooler. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 The structure of the fuel cell temperature and humidity control system of the embodiment of the present invention is shown in FIG. Figure 1 ;

[0035] Figure 2 The structure of the fuel cell temperature and humidity control system of the embodiment of the present invention is shown in FIG. Figure 2 .

[0036] Reference numerals:

[0037] 1. Fuel cell stack; 2. Air supply device; 3. Humidifier; 4. First intercooler; 5. Second intercooler; 6. First multi-way valve; 7. Liquid supply device; 8. Second multi-way valve; 9. Inlet shut-off valve; 10. Outlet shut-off valve; 11. First sensor; 12. Second sensor; 13. Third sensor; 14. Manifold. DETAILED DESCRIPTION

[0038] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0039] Reference below Figure 1 and Figure 2 A fuel cell temperature and humidity control system and control method according to an embodiment of the present invention are described.

[0040] like Figure 1 and Figure 2 As shown, the fuel cell temperature and humidity control system of the embodiment of the present invention includes an air supply device 2, a humidifier 3, a first intercooler 4 and a second intercooler 5.

[0041] The air supply device 2 is connected to the air supply pipeline, and the air supply pipeline is used to connect the fuel cell stack 1. The humidifier 3 is arranged on the air supply pipeline. The first intercooler 4 is arranged on the air supply pipeline and is located between the air supply device 2 and the humidifier 3. The second intercooler 5 is arranged on the air supply pipeline and is located between the humidifier 3 and the fuel cell stack 1.

[0042] Specifically, Figure 1 and Figure 2As shown, the gas supply pipeline is connected to the air inlet of the fuel cell stack 1. Preferably, the gas supply pipeline is connected to the air inlet of the cathode of the fuel cell stack 1 to supply air to the fuel cell stack 1. Along the gas supply direction of the gas supply pipeline, in other words, along the flow direction of the gas in the gas supply pipeline, the gas supply device 2, the first intercooler 4, the humidifier 3 and the second intercooler 5 are arranged in sequence and arranged on the gas supply pipeline. The first intercooler 4 and the second intercooler 5 are used to adjust the temperature of the gas in the gas supply pipeline, wherein the first intercooler 4 is mainly used to reduce the temperature of the gas raised by the pressurization of the gas supply device 2, the second intercooler 5 is mainly used to reduce the temperature of the gas raised by heat exchange in the humidifier 3, the humidifier 3 is used to adjust the humidity of the gas in the gas supply pipeline, and the gas supply device 2 is preferably an air compressor.

[0043] It is understandable that the gas supply pipeline is not limited to the gas inlet connected to the cathode of the fuel cell stack. In other words, the fuel cell temperature and humidity control system is not limited to regulating the temperature and humidity of the cathode gas.

[0044] The fuel cell temperature and humidity control system of the embodiment of the present invention is provided with a first intercooler, a humidifier and a second intercooler in sequence along the gas supply direction on the gas supply pipeline connected to the gas supply device. The gas supplied by the gas supply pipeline first passes through the first intercooler and has its temperature adjusted by the first intercooler, then passes through the humidifier and has its humidity adjusted by the humidifier, and then passes through the second intercooler and has its temperature adjusted by the second intercooler. Since the gas also exchanges heat in the humidifier and affects the temperature of the gas, the second intercooler can be used to ensure that the temperature of the gas meets the requirements, thereby ensuring that the temperature and humidity of the gas supplied to the fuel cell stack meet the requirements.

[0045] In some embodiments, the second intercooler 5 includes a second liquid chamber and a second air chamber, the second liquid chamber is connected to the coolant outlet of the battery stack 1, and the second air chamber is connected to the air supply pipeline, and the coolant in the second liquid chamber and the gas in the second air chamber can exchange heat.

[0046] like Figure 1 and Figure 2 As shown, the inlet of the second air cavity is connected to the humidifier 3 through the air supply pipeline, and the outlet of the second air cavity is connected to the fuel cell stack 1 through the air supply pipeline. The gas in the air supply pipeline enters the second air cavity for heat exchange after the humidity is adjusted by the humidifier 3 to adjust the temperature, and then is supplied to the fuel cell stack 1.

[0047] The inlet of the second liquid chamber is connected to the coolant outlet of the battery stack 1 through a pipeline, and the coolant discharged from the battery stack 1 enters the second liquid chamber for heat exchange to fully utilize the coolant and ensure the second intercooler 5 has a regulating effect on the gas temperature in the gas supply pipeline.

[0048] In some embodiments, the fuel cell temperature and humidity control system of an embodiment of the present invention also includes a first multi-way valve 6, the first valve port of the first multi-way valve 6 is connected to the coolant outlet, the second valve port of the first multi-way valve 6 is connected to the second liquid chamber, and the third valve port of the first multi-way valve 6 is used to discharge the coolant.

[0049] like Figure 1 and Figure 2 As shown, the coolant outlet of the battery stack 1 is connected to the first valve port of the first multi-way valve 6 through a pipeline, and the coolant discharged from the battery stack 1 first reaches the first multi-way valve 6 for distribution.

[0050] The second valve port of the first multi-way valve 6 is connected to the inlet of the second liquid chamber, and the third valve port of the first multi-way valve 6 is used to discharge the coolant. Therefore, the coolant discharged from the battery stack 1 can be supplied to the second liquid chamber and discharged respectively under the distribution of the first multi-way valve 6.

[0051] The flow rate of the coolant supplied to the second liquid chamber can be adjusted by the opening of the second valve port of the first multi-way valve 6, and the flow rate of the coolant discharged from the first multi-way valve 6 can be adjusted by the opening of the third valve port of the first multi-way valve 6. Therefore, by adjusting the opening of the second valve port of the first multi-way valve 6, or by adjusting the openings of the second valve port and the third valve port of the first multi-way valve 6, the flow rate of the coolant supplied to the second liquid chamber can be adjusted to adjust the heat exchange effect of the second intercooler 5, thereby adjusting the temperature of the gas discharged from the second intercooler 5 in the air supply pipeline.

[0052] The first multi-way valve 6 is preferably a three-way valve.

[0053] In some embodiments, the first intercooler 4 includes a first liquid cavity and a first air cavity, the coolant in the first liquid cavity and the gas in the first air cavity can exchange heat, and the first air cavity is connected to the air supply pipeline.

[0054] The fuel cell temperature and humidity control system of the embodiment of the present invention further includes a liquid supply device 7 and a second multi-way valve 8. The liquid supply device 7 is used to supply coolant. The first valve port of the second multi-way valve 8 is connected to the liquid supply device 7, the second valve port of the second multi-way valve 8 is connected to the coolant inlet of the fuel cell stack 1, and the third valve port of the second multi-way valve 8 is connected to the first liquid chamber.

[0055] like Figure 1 and Figure 2 As shown, the inlet of the first air cavity is connected to the air supply device 2 through the air supply pipeline, and the outlet of the first air cavity is connected to the humidifier 3 through the air supply pipeline. The gas provided by the air supply device 2 first reaches the first air cavity through the air supply pipeline, and the temperature is adjusted by heat exchange in the first air cavity, and then reaches the humidifier through the air supply pipeline.

[0056] The liquid supply device 7 is used to supply the cooling liquid, and preferably, the liquid supply device 7 is a water pump. The liquid supply device 7 is connected to the first valve port of the second multi-way valve 8 through a pipeline to supply the cooling liquid to the second multi-way valve 8 for distribution.

[0057] The second valve port of the second multi-way valve 8 is connected to the coolant inlet of the battery stack 1 through a pipeline, and the third valve port of the second multi-way valve 8 is connected to the inlet of the first liquid chamber through a pipeline. Therefore, the coolant is distributed by the second multi-way valve 8 and is supplied to the battery stack 1 and the first liquid chamber respectively.

[0058] The flow rate of the coolant supplied to the fuel cell stack 1 can be adjusted by the opening of the second valve port of the second multi-way valve 8, and the flow rate of the coolant supplied to the first liquid chamber can be adjusted by the opening of the third valve port of the second multi-way valve 8. Therefore, by adjusting the opening of the second valve port of the second multi-way valve 8, or by adjusting the openings of the second valve port and the third valve port of the second multi-way valve 8, the flow rate of the coolant supplied to the first liquid chamber can be adjusted to adjust the heat exchange effect of the first intercooler 4, thereby adjusting the temperature of the gas discharged from the first intercooler 4 in the air supply pipeline.

[0059] The second multi-way valve 8 is preferably a three-way valve.

[0060] Preferably, the flow rate of the coolant supplied by the liquid supply device 7 is adjustable to ensure the coolant requirements of the first intercooler 4 and the fuel cell stack 1 at the same time.

[0061] In some embodiments, the fuel cell temperature and humidity control system of the embodiment of the present invention further includes a manifold 14 , and the third valve port of the first multi-way valve 6 , the outlet of the second liquid chamber, and the outlet of the first liquid chamber are all connected to the manifold 14 .

[0062] like Figure 1 and Figure 2 As shown, the inlet end of the manifold 14 is connected to the first valve port of the third multi-way valve, the third valve port of the first multi-way valve 6 is connected to the second valve port of the third multi-way valve through a pipeline, the outlet of the second liquid chamber is connected to the third valve port of the third multi-way valve through a pipeline, and the outlet of the first liquid chamber is connected to the fourth valve port of the third multi-way valve through a pipeline. The coolant discharged from the third valve port of the first multi-way valve 6, the coolant discharged from the second liquid chamber, and the coolant discharged from the first liquid chamber are converged into the manifold 14 through the third multi-way valve to facilitate the collection and reuse of the coolant.

[0063] In some embodiments, the humidifier 3 includes a dry side chamber and a wet side chamber. The gas in the wet side chamber can exchange humidity with the gas in the dry side chamber. The dry side chamber is connected to the gas supply pipeline, and the wet side chamber is connected to the exhaust port of the fuel cell stack 1 through the exhaust pipeline.

[0064] like Figure 1 and Figure 2As shown, the humidifier 3 includes a dry side chamber and a wet side chamber, and a membrane assembly is provided between the dry side chamber and the wet side chamber so that the gas in the wet side chamber can exchange humidity with the gas in the dry side chamber. In other words, the gas in the wet side chamber can humidify the gas in the dry side chamber.

[0065] The dry side chamber is provided with a dry air inlet and a dry air outlet. The dry air inlet is connected to the first air cavity of the first intercooler 4 through an air supply pipeline, and the dry air outlet is connected to the second air cavity of the second intercooler 5 through an air supply pipeline.

[0066] The wet side chamber is provided with a wet air inlet and a wet air outlet. The wet air inlet is connected to the exhaust port of the fuel cell stack 1 through an exhaust pipeline, preferably connected to the exhaust port of the cathode of the fuel cell stack 1.

[0067] The gas discharged from the first air cavity is supplied to the dry side chamber, and the gas discharged from the fuel cell stack 1 is supplied to the wet side chamber. The humidity of the gas supplied by the gas supply pipeline is increased by the gas discharged from the fuel cell stack 1 to adjust the humidity of the gas supplied by the gas supply pipeline, and the gas discharged from the fuel cell stack 1 is utilized. The gas with adjusted humidity is supplied to the fuel cell stack 1 after the temperature is adjusted by the second intercooler 5.

[0068] Furthermore, the wet air outlet is connected to a tail exhaust pipe, and the gas in the wet side chamber is discharged through the tail exhaust pipe.

[0069] It is understandable that the air supply device is not limited to being arranged only on the air supply pipeline. Figure 2 In the illustrated embodiment, the air supply device is an air compressor with an energy recovery function, and the air supply device is connected between the air supply pipeline and the tail exhaust pipe.

[0070] In some embodiments, Figure 1 and Figure 2 As shown, the fuel cell temperature and humidity control system of the embodiment of the present invention also includes an inlet shut-off valve 9 and an outlet shut-off valve 10. The inlet shut-off valve 9 is arranged on the gas supply pipeline and is located between the second intercooler 5 and the fuel cell stack 1 to control the connection and disconnection of the gas supply pipeline and the fuel cell stack 1. The outlet shut-off valve 10 is arranged on the exhaust pipeline and is located between the humidifier 3 and the fuel cell stack 1 to control the connection and disconnection of the exhaust pipeline and the exhaust port of the fuel cell stack 1.

[0071] In some embodiments, Figure 1 and Figure 2 As shown, the fuel cell temperature and humidity control system of the embodiment of the present invention further includes a first sensor 11, a second sensor 12, a third sensor 13 and a fourth sensor.

[0072] The first sensor 11 obtains the temperature of the coolant supplied to the first intercooler 4. The first sensor 11 is arranged on one of the coolant inlet of the stack 1, the pipeline connecting the coolant inlet and the second multi-way valve 8, the pipeline connecting the liquid supply device 7 and the second multi-way valve 8, and the pipeline connecting the first intercooler 4 and the second multi-way valve 8. Preferably, the first sensor 11 is arranged on the pipeline connecting the liquid supply device 7 and the second multi-way valve 8.

[0073] The second sensor 12 obtains the temperature of the coolant supplied to the second intercooler 5. The second sensor 12 is arranged on one of the coolant outlet of the stack 1, the pipeline connecting the coolant outlet and the first multi-way valve 6, the pipeline connecting the manifold 14 and the first multi-way valve 6, and the pipeline connecting the second intercooler 5 and the first multi-way valve 6. Preferably, the second sensor 12 is arranged on the pipeline connecting the coolant outlet and the first multi-way valve 6.

[0074] The third sensor 13 obtains the temperature and humidity of the gas supplied to the fuel cell stack 1. The third sensor 13 is arranged at the air inlet of the fuel cell stack 1, or arranged on the gas supply pipeline and located between the fuel cell stack 1 and the second intercooler 5. Preferably, the third sensor 13 is arranged on the gas supply pipeline and located between the fuel cell stack 1 and the stack entry shut-off valve 9.

[0075] The fourth sensor (not shown in the figure) obtains the temperature of the gas supplied to the wet side chamber of the humidifier 3. The fourth sensor is arranged at the inlet of the wet side chamber of the humidifier 3, or arranged on the exhaust pipeline and located between the humidifier 3 and the stack 1. Preferably, the fourth sensor is arranged on the exhaust pipeline and located between the humidifier 3 and the stack stop valve 10.

[0076] It is understandable that the fourth sensor may not be provided when the humidifier has the temperature and humidity detection function.

[0077] The data obtained by the first sensor 11, the second sensor 12, the third sensor 13 and the fourth sensor can monitor the operating status of the fuel cell temperature and humidity control system, and can adjust the opening of the first multi-way valve 6 and the second multi-way valve 8 according to the data obtained by the first sensor 11, the second sensor 12, the third sensor 13 and the fourth sensor, so as to adjust the operating effect of the humidifier 3, the first intercooler 4 and the second intercooler 5, thereby ensuring that the temperature and humidity of the gas supplied to the fuel cell stack 1 meet the requirements.

[0078] The embodiment of the present invention further provides a fuel cell temperature and humidity control method. The fuel cell temperature and humidity control method of the embodiment of the present invention is implemented based on the fuel cell temperature and humidity control system of the embodiment of the present invention.

[0079] like Figure 1 and Figure 2 As shown, the fuel cell temperature and humidity control method of the embodiment of the present invention includes:

[0080] Obtain the required water carrying capacity of the fuel cell stack 1.

[0081] Specifically, first confirm that the power generation state of the fuel cell is qualified, then determine the operating condition of the fuel cell stack 1 , and then determine the required water carrying capacity of the fuel cell stack 1 according to the operating condition of the fuel cell stack 1 .

[0082] The coolant flow rate of the first intercooler 4 is adjusted according to the temperature of the gas supplied to the wet side chamber of the humidifier 3 and the temperature of the coolant supplied to the first intercooler 4, and the coolant flow rate of the second intercooler 5 is adjusted according to the temperature of the gas supplied to the wet side chamber of the humidifier 3 and the temperature of the coolant supplied to the second intercooler 5.

[0083] Specifically, the data of the fourth sensor is read to obtain the temperature of the gas supplied to the wet side chamber. The data of the first sensor 11 is read to obtain the temperature of the coolant supplied to the first intercooler 4. The data of the second sensor 12 is read to obtain the temperature of the coolant supplied to the second intercooler 5.

[0084] The opening of the second multi-way valve 8 is adjusted according to the data of the fourth sensor and the data of the first sensor 11, preferably the opening of the third valve port of the second multi-way valve 8 is adjusted to adjust the coolant flow supplied to the first intercooler 4, thereby adjusting the temperature regulation effect of the first intercooler 4.

[0085] The opening of the first multi-way valve 6 is adjusted according to the data of the fourth sensor and the data of the second sensor 12, preferably the opening of the second valve port of the first multi-way valve 6 is adjusted to adjust the coolant flow supplied to the second intercooler 5, thereby adjusting the temperature regulation effect of the second intercooler 5.

[0086] After adjusting the coolant flow rates of the first intercooler 4 and the second intercooler 5 , the temperature and humidity of the gas supplied to the fuel cell stack 1 are obtained, and the actual water carrying capacity of the fuel cell stack 1 is obtained based on the temperature, humidity and flow rate of the gas supplied to the fuel cell stack 1 .

[0087] Specifically, after adjusting the coolant flow rate supplied to the first intercooler 4 and the second intercooler 5, the data of the third sensor 13 is read to obtain the temperature and humidity of the gas supplied to the fuel cell stack 1, preferably the temperature and humidity of the gas supplied to the cathode of the fuel cell stack 1. The actual water carrying capacity of the fuel cell stack 1 is calculated based on the temperature and humidity of the gas supplied to the fuel cell stack 1 and the flow rate of the gas supplied to the fuel cell stack 1. The flow rate of the gas supplied to the fuel cell stack 1 can be obtained by the gas supply device 2, or by setting a sensor on the gas supply pipeline to obtain it.

[0088] Determine whether the actual water carrying capacity meets the required water carrying capacity. When the actual water carrying capacity does not meet the required water carrying capacity, couple and adjust the coolant flow of the first intercooler 4 and the coolant flow of the second intercooler 5, then repeat the steps of obtaining the actual water carrying capacity, and repeat the steps of determining whether the actual water carrying capacity meets the required water carrying capacity until the actual water carrying capacity meets the required water carrying capacity.

[0089] Specifically, the actual water carrying capacity is compared with the required water carrying capacity. When the specific value or value range of the actual water carrying capacity is consistent with the specific value or value range of the required water carrying capacity, and when the specific value or value range of the actual water carrying capacity is within the value range of the required water carrying capacity, the actual water carrying capacity meets the required water carrying capacity. At this time, the fuel cell temperature and humidity control system can operate.

[0090] When the specific value of the actual water carrying capacity is different from the specific value of the required water carrying capacity, and the specific value of the actual water carrying capacity is outside the numerical range of the required water carrying capacity, and at least part of the numerical range of the actual water carrying capacity is outside the numerical range of the required water carrying capacity, the actual water carrying capacity does not meet the required water carrying capacity. At this time, the coolant flow rate of the first intercooler 4 and the coolant flow rate of the second intercooler 5 are coupled and adjusted, and then the data of the third sensor 13 is repeatedly read to repeatedly obtain the temperature and humidity of the gas supplied to the fuel cell stack 1, and the actual water carrying capacity of the fuel cell stack 1 is repeatedly calculated and obtained, and the repeatedly obtained actual water carrying capacity is compared with the required water carrying capacity until the actual water carrying capacity meets the required water carrying capacity.

[0091] Since the actual water carrying capacity is linearly related to the gas temperature controlled by the first intercooler 4, the actual water carrying capacity can be adjusted by adjusting the flow rate of the coolant of the first intercooler 4. After the actual water carrying capacity is adjusted to meet the required water carrying capacity, the temperature of the gas supplied to the fuel cell stack 1 can be adjusted by adjusting the flow rate of the coolant of the second intercooler 5 to meet the temperature requirement of the fuel cell stack 1.

[0092] The fuel cell temperature and humidity control method of the embodiment of the present invention adjusts the actual water carrying capacity by adjusting the coolant flow of the first intercooler and the second intercooler to ensure that the actual water carrying capacity meets the required water carrying capacity, thereby ensuring that the temperature and humidity of the gas supplied to the fuel cell stack meets the operating requirements of the fuel cell stack.

[0093] It should be noted that the step of obtaining the required water carrying capacity of the battery stack is not limited to being performed first. It is only necessary to obtain the required water carrying capacity before the step of determining whether the actual water carrying capacity meets the required water carrying capacity. In other words, the step of obtaining the required water carrying capacity of the battery stack can be performed before adjusting the coolant flow of the first intercooler and the second intercooler, or after adjusting the coolant flow of the first intercooler and the second intercooler, or after obtaining the actual water carrying capacity. It is preferably performed before adjusting the coolant flow of the first intercooler and the second intercooler.

[0094] It can be understood that the fuel cell temperature and humidity control method of the embodiment of the present invention is not limited to judging whether the actual water carrying capacity meets the required water carrying capacity. In some embodiments, while judging whether the actual water carrying capacity meets the required water carrying capacity, it is also judged whether the actual temperature of the gas supplied to the fuel cell stack 1 meets the required temperature and whether the actual humidity of the gas supplied to the fuel cell stack 1 meets the required humidity. When at least one of the actual water carrying capacity, actual temperature and actual humidity does not meet the requirements, it is necessary to couple and adjust the coolant flow of the first intercooler and the coolant flow of the second intercooler.

[0095] In some embodiments, the steps of adjusting the coolant flow rate of the first intercooler 4 according to the temperature of the gas supplied to the wet side chamber of the humidifier 3 and the temperature of the coolant supplied to the first intercooler 4, and adjusting the coolant flow rate of the second intercooler 5 according to the temperature of the gas supplied to the wet side chamber of the humidifier 3 and the temperature of the coolant supplied to the second intercooler 5 specifically include:

[0096] The temperature of the gas supplied to the dry-side chamber of the humidifier 3 and the temperature of the gas discharged from the dry-side chamber are obtained according to the temperature of the gas supplied to the wet-side chamber and the performance of the humidifier 3 .

[0097] Specifically, the data of the fourth sensor is read to obtain the temperature of the gas supplied to the wet side chamber, and the temperature of the gas supplied to the dry side chamber and the temperature of the gas discharged from the dry side chamber are calculated based on the temperature of the gas supplied to the wet side chamber and the performance curve of the humidifier 3.

[0098] The coolant flow rate of the first intercooler 4 is adjusted according to the temperature of the coolant supplied to the first intercooler 4 , the temperature of the gas supplied to the dry-side chamber, and the performance of the first intercooler 4 .

[0099] Specifically, the data of the first sensor 11 is read to obtain the temperature of the coolant supplied to the first intercooler 4, and the opening of the second multi-way valve 8 is adjusted according to the temperature of the coolant supplied to the first intercooler 4, the temperature of the gas supplied to the dry side chamber and the performance curve of the first intercooler 4 to adjust the flow rate of the coolant supplied to the first intercooler 4.

[0100] More specifically, the intake temperature and exhaust temperature of the first air cavity of the first intercooler 4 and the mass flow rate M1 of the gas passing through the first air cavity are obtained. The intake temperature of the first air cavity is the original temperature of the gas in the air supply pipeline, and the exhaust temperature of the first air cavity is the temperature of the gas supplied to the dry side chamber.

[0101] The difference ΔT1 between the intake temperature and the exhaust temperature of the first air cavity is calculated, and the heat exchange demand Q1 of the gas in the first intercooler 4 is calculated according to the formula Q1=C×M1×ΔT1, where C is the specific heat capacity of the gas.

[0102] According to the performance curve of the first intercooler 4 and the liquid inlet temperature of the first liquid chamber of the first intercooler 4 , the flow rate of the coolant required by the first intercooler 4 is obtained, and the opening of the second multi-way valve 8 is adjusted accordingly.

[0103] The performance curve of the first intercooler 4 is a heat exchange efficiency curve of the first intercooler 4 , and the inlet temperature of the first liquid chamber is the temperature of the coolant supplied to the first intercooler 4 , which is read by the first sensor 11 .

[0104] The coolant flow rate of the second intercooler 5 is adjusted according to the temperature of the coolant supplied to the second intercooler 5 , the temperature of the gas exhausted from the dry-side chamber, and the performance of the second intercooler 5 .

[0105] Specifically, the data of the second sensor 12 is read to obtain the temperature of the coolant supplied to the second intercooler 5, and the opening of the first multi-way valve 6 is adjusted according to the temperature of the coolant supplied to the second intercooler 5, the temperature of the gas discharged from the dry side chamber and the performance curve of the second intercooler 5 to adjust the flow rate of the coolant supplied to the second intercooler 5.

[0106] More specifically, the intake temperature and exhaust temperature of the second air cavity of the second intercooler 5 and the mass flow rate M2 of the gas passing through the second air cavity are obtained. The intake temperature of the second air cavity is the temperature of the gas discharged from the dry side chamber, and the exhaust temperature of the second air cavity is the temperature of the gas supplied to the fuel cell stack 1, which are read by the third sensor 13.

[0107] The difference ΔT2 between the intake temperature and the exhaust temperature of the second air cavity is calculated, and the heat exchange demand Q2 of the gas in the second intercooler 5 is calculated according to the formula Q2=C×M2×ΔT2.

[0108] According to the performance curve of the second intercooler 5 and the liquid inlet temperature of the second liquid chamber of the second intercooler 5 , the flow rate of the coolant required by the second intercooler 5 is obtained, and the opening degree of the first multi-way valve 6 is adjusted accordingly.

[0109] The performance curve of the second intercooler 5 is a heat exchange efficiency curve of the second intercooler 5 , and the inlet temperature of the second liquid chamber is the temperature of the coolant supplied to the second intercooler 5 , which is read by the second sensor 12 .

[0110] It should be noted that the step of obtaining and adjusting the coolant flow rate of the first intercooler 4 and the step of obtaining and adjusting the coolant flow rate of the second intercooler 5 are not limited in order and can be performed simultaneously or one of them can be performed first.

[0111] In some embodiments, the fuel cell temperature and humidity control method of the embodiment of the present invention also includes, when the actual water carrying capacity meets the required water carrying capacity, judging whether the fuel cell temperature and humidity control system is shut down; if it is judged that the fuel cell temperature and humidity control system does not need to be shut down, the fuel cell temperature and humidity control system maintains operation, and repeats the step of obtaining the required water carrying capacity of the fuel cell stack to continuously adjust and control the opening of the first multi-way valve 6 and the second multi-way valve 8 to ensure that the temperature and humidity of the gas supplied to the fuel cell stack 1 meet the requirements; if it is judged that the fuel cell temperature and humidity control system needs to be shut down, the fuel cell temperature and humidity control system is shut down.

[0112] In the description of the present invention, it should be understood that the terms "first" and "second" are only used for distinction, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features.

[0113] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0114] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0115] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0116] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A fuel cell temperature and humidity control system, characterized in that: include: A gas supply device (2), the gas supply device (2) being connected to a gas supply pipeline, and the gas supply pipeline being used to connect to the fuel cell stack (1); A humidifier (3), wherein the humidifier (3) is arranged on the air supply pipeline; a first intercooler (4), the first intercooler (4) being arranged on the air supply pipeline and located between the air supply device (2) and the humidifier (3); A second intercooler (5), the second intercooler (5) is arranged on the air supply pipeline and is located between the humidifier (3) and the fuel cell stack (1).

2. The fuel cell temperature and humidity control system according to claim 1, characterized in that: The second intercooler (5) comprises a second liquid chamber and a second air chamber, the second liquid chamber is connected to the coolant outlet of the fuel cell stack (1), the second air chamber is connected to the air supply pipeline, and the coolant in the second liquid chamber and the gas in the second air chamber can exchange heat.

3. The fuel cell temperature and humidity control system according to claim 2, characterized in that: It also includes a first multi-way valve (6), wherein a first valve port of the first multi-way valve (6) is connected to the coolant outlet, a second valve port of the first multi-way valve (6) is connected to the second liquid chamber, and a third valve port of the first multi-way valve (6) is used to discharge the coolant.

4. The fuel cell temperature and humidity control system according to claim 3, characterized in that: The first intercooler (4) comprises a first liquid cavity and a first air cavity, the cooling liquid in the first liquid cavity and the gas in the first air cavity can exchange heat, and the first air cavity is connected to the air supply pipeline; The fuel cell temperature and humidity control system also includes: A liquid supply device (7), wherein the liquid supply device (7) is used to supply cooling liquid; A second multi-way valve (8), wherein the first valve port of the second multi-way valve (8) is connected to the liquid supply device (7), the second valve port of the second multi-way valve (8) is connected to the coolant inlet of the fuel cell stack (1), and the third valve port of the second multi-way valve (8) is connected to the first liquid chamber.

5. The fuel cell temperature and humidity control system according to claim 4, characterized in that: It also comprises a manifold (14), to which the third valve port of the first multi-way valve (6), the outlet of the second liquid chamber, and the outlet of the first liquid chamber are all connected.

6. The fuel cell temperature and humidity control system according to claim 1, characterized in that: The humidifier (3) comprises a dry side chamber and a wet side chamber, the gas in the wet side chamber and the gas in the dry side chamber can exchange humidity, the dry side chamber is connected to the gas supply pipeline, and the wet side chamber is connected to the exhaust port of the fuel cell stack (1) via an exhaust pipeline.

7. The fuel cell temperature and humidity control system according to claim 6, characterized in that: It also includes an entry shutoff valve (9) and an exit shutoff valve (10), wherein the entry shutoff valve (9) is arranged on the gas supply pipeline and is located between the second intercooler (5) and the fuel cell stack (1), and the exit shutoff valve (10) is arranged on the exhaust pipeline and is located between the humidifier (3) and the fuel cell stack (1).

8. The fuel cell temperature and humidity control system according to claim 1, characterized in that: Also includes: a first sensor (11), the first sensor (11) acquiring the temperature of the coolant supplied to the first intercooler (4); a second sensor (12), the second sensor (12) acquiring the temperature of the coolant supplied to the second intercooler (5); A third sensor (13), the third sensor (13) acquiring the temperature and humidity of the gas supplied to the fuel cell stack (1); A fourth sensor is used to obtain the temperature of the gas supplied to the wet side chamber of the humidifier (3).

9. A method for controlling temperature and humidity of a fuel cell, characterized in that: Based on the implementation of the fuel cell temperature and humidity control system according to any one of claims 1 to 8, the fuel cell temperature and humidity control method comprises: Obtaining the required water carrying capacity of the fuel cell stack (1); adjusting the coolant flow rate of the first intercooler (4) according to the temperature of the gas supplied to the wet side chamber of the humidifier (3) and the temperature of the coolant supplied to the first intercooler (4), and adjusting the coolant flow rate of the second intercooler (5) according to the temperature of the gas supplied to the wet side chamber of the humidifier (3) and the temperature of the coolant supplied to the second intercooler (5); After adjusting the coolant flow rates of the first intercooler (4) and the second intercooler (5), the temperature and humidity of the gas supplied to the fuel cell stack (1) are obtained, and the actual water carrying capacity of the fuel cell stack (1) is obtained according to the temperature, humidity and flow rate of the gas supplied to the fuel cell stack (1); Determining whether the actual water carrying capacity meets the required water carrying capacity, and when the actual water carrying capacity does not meet the required water carrying capacity, coupling and adjusting the coolant flow of the first intercooler (4) and the coolant flow of the second intercooler (5), and then repeating the step of obtaining the actual water carrying capacity, and repeating the step of determining whether the actual water carrying capacity meets the required water carrying capacity, until the actual water carrying capacity meets the required water carrying capacity.

10. The fuel cell temperature and humidity control method according to claim 9, characterized in that: Obtaining the temperature of the gas supplied to the dry side chamber of the humidifier (3) and the temperature of the gas discharged from the dry side chamber according to the temperature of the gas supplied to the wet side chamber and the performance of the humidifier (3); adjusting the coolant flow rate of the first intercooler (4) according to the temperature of the coolant supplied to the first intercooler (4), the temperature of the gas supplied to the dry side chamber and the performance of the first intercooler (4); The coolant flow rate of the second intercooler (5) is adjusted according to the temperature of the coolant supplied to the second intercooler (5), the temperature of the gas discharged from the dry side chamber and the performance of the second intercooler (5).

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