Fuel cell stack test system

Abstract

A fuel cell stack test system belongs to the field of fuel cell stack testing. In order to reduce the cooling energy consumption of the circulating water system in the fuel cell stack test system, part of the heat is supplied to the gas supply system to increase the gas supply temperature. The technical point is that at least one of the hydrogen gas supply pipeline and the air gas supply pipeline is provided with a plate heat exchanger, and the stack water outlet pipeline includes at least one water outlet branch. The water outlet branch supplies the second temperature circulating water of the stack from the stack to the secondary side of the plate heat exchanger of the corresponding gas supply pipeline, and supplies it to the water tank through the secondary side. The primary side of the plate heat exchanger is the flow side corresponding to the gas supply. The effect is to reduce not only the cooling energy consumption of the circulating water system but also the heat energy consumption of the gas supply system to a certain extent.

Description

Technical Field

[0001] The utility model belongs to the field of fuel cell stack testing, and specifically relates to a fuel cell stack testing system, and in particular to a test air supply system and a circulating water system. Background Art

[0002] A fuel cell is a device that converts the chemical energy of reactants into electrical energy. It has the characteristics of high power generation efficiency, low environmental pollution, high specific energy, and high reliability. The fuel cell stack performance test needs to be carried out on a fuel cell test bench. The fuel cell test bench includes a gas supply system, a circulating water supply system, a detection and data acquisition system, etc.

[0003] The gas supply system of the test bench is mainly used to supply reaction gases such as hydrogen and air. Since the most suitable operating temperature of the fuel cell is 70-80℃, and the gas involved in the reaction is usually at room temperature before entering the test bench, a high-power heating belt is usually required to be wrapped around the gas inlet pipeline to meet the gas heating requirements.

[0004] The circulating water supply system supplies the circulating water required by the fuel cell stack to the test bench. The main function of the circulating water is to take away the heat generated during the fuel cell stack reaction, so that the fuel cell stack is always stable in the appropriate reaction temperature range. The circulating water absorbs a large amount of heat in the fuel cell stack, causing its own temperature to rise. After the heated circulating water flows out of the fuel cell stack, it can be cooled by external cooling water. After the circulating water drops to a certain temperature, it can be circulated into the fuel cell stack again to continue to cool the fuel cell stack. Therefore, during the operation of the fuel cell stack, the circulating water needs to be continuously cooled by the low-temperature external cooling water before flowing into the fuel cell stack for cooling the fuel cell stack. This causes the temperature of the external cooling water to rise rapidly after absorbing heat, and it needs to be cooled by equipment such as a chiller. During the fuel cell stack test, the chiller will consume a lot of electricity.

[0005] The Chinese utility model patent with announcement number CN213150836U and announcement date 20210507 discloses a fuel cell stack test bench, which is equipped with a separate cooling system for cooling, but only involves the gas supply system part. The Chinese utility model patent with announcement number CN210692685U and announcement date 20200605 discloses a fuel cell stack test device, which dissipates heat through a component circulating water pipeline with a radiator, and completely relies on the water supply circulation of the water supply tank for heat dissipation, which still cannot avoid a large amount of power consumption or cooling water consumption. Utility Model Content

[0006] In order to solve the problem of reducing the cooling energy consumption of the circulating water system in the fuel cell stack test system, the utility model supplies part of the heat to the air supply system to increase the air supply temperature, which to a certain extent not only reduces the cooling energy consumption of the circulating water system, but also reduces the heat energy consumption of the air supply system.

[0007] According to some embodiments of the present application, the fuel cell stack testing system includes:

[0008] A hydrogen supply pipeline for supplying hydrogen to the fuel cell stack;

[0009] An air supply pipeline, supplying air to the fuel cell stack;

[0010] A water circulation system, comprising a water tank, a stack water supply pipeline and a stack water outlet pipeline, wherein the stack water supply pipeline supplies circulating water of a first temperature in the water tank to the stack from the water tank, and the stack water outlet pipeline supplies circulating water of a second temperature of the stack from the stack to the water tank;

[0011] Among them, at least one of the hydrogen supply pipeline and the air supply pipeline is provided with a plate heat exchanger, and the stack water outlet pipeline includes at least one water outlet branch, and the water outlet branch supplies the second temperature circulating water of the stack from the stack to the secondary side of the plate heat exchanger of the corresponding gas supply pipeline, and then supplies it to the water tank through the secondary side, and the primary side of the plate heat exchanger is the flow side corresponding to the gas supply.

[0012] According to the fuel cell stack test system in some embodiments of the present application, the hydrogen gas supply pipeline is provided with a first plate heat exchanger, the air gas supply pipeline is provided with a second gas supply pipeline, and the stack water outlet pipeline includes

[0013] a first water outlet branch, the first water outlet branch supplies the second temperature circulating water output by the fuel cell stack to the secondary side of the first plate heat exchanger of the hydrogen supply pipeline, and supplies the circulating water to the water tank through the secondary side of the first plate heat exchanger, the primary side of the first plate heat exchanger being the flow side of the hydrogen supply;

[0014] The second water outlet branch supplies the second temperature circulating water output by the fuel cell stack to the secondary side of the second plate heat exchanger of the air supply pipeline, and supplies it to the water tank through the secondary side of the second plate heat exchanger, and the primary side of the second plate heat exchanger is the air supply flow side.

[0015] According to the fuel cell stack testing system in some embodiments of the present application, the stack water outlet pipeline also includes at least one third water outlet branch, and the third water outlet branch supplies the second temperature circulating water from the stack to the water tank.

[0016] According to the fuel cell stack test system in some embodiments of the present application, the inlet of the stack water outlet pipeline is connected to the circulating water outlet of the stack, the outlet of the stack water outlet pipeline is connected to the inlet of the multi-way valve, and the inlets of the first water outlet branch, the second water outlet branch, and the third water outlet branch are each connected to an outlet of the multi-way valve;

[0017] The inlet and outlet of the secondary side of the first plate heat exchanger are connected to the first water outlet branch, and the outlet of the first water outlet branch is connected to an inlet of the water tank;

[0018] The inlet and outlet of the secondary side of the second plate heat exchanger are connected to the second water outlet branch, and the outlet of the second water outlet branch is connected to an inlet of the water tank;

[0019] The outlet of the third water outlet branch is connected to an inlet of the water tank.

[0020] According to the fuel cell stack testing system in some embodiments of the present application, a seventh temperature sensor, a first flow sensor located in the pipeline downstream of the seventh temperature sensor, and a third heating zone located in the pipeline downstream of the first flow sensor are provided in the pipeline between the inlet of the stack water outlet pipeline and the inlet of the multi-way valve.

[0021] According to the fuel cell stack testing system in some embodiments of the present application, the inlet of the stack water supply pipeline of the water circulation system is connected to the circulating water outlet of the water tank, and the outlet of the stack water supply pipeline is connected to the circulating water inlet of the stack, and a third plate heat exchanger is arranged in the pipeline between the inlet and the outlet of the stack water supply pipeline, and the primary side of the third plate heat exchanger is the circulating water flow side of the water tank, and the secondary side of the third plate heat exchanger is the external cooling water flow side.

[0022] According to the fuel cell stack testing system in some embodiments of the present application, a first heating belt and a first temperature sensor located in the pipeline downstream of the first heating belt are arranged in the pipeline between the inlet of the stack water supply pipeline and the inlet of the primary side of the third plate heat exchanger, and a second heating belt and a second temperature sensor located in the pipeline downstream of the second heating belt are arranged between the outlet of the primary side of the third plate heat exchanger and the outlet of the stack water supply pipeline.

[0023] According to the fuel cell stack testing system in some embodiments of the present application, a third temperature sensor and a heating rod are provided in the water tank of the water circulation system.

[0024] According to the fuel cell stack test system in some embodiments of the present application, the inlet of the hydrogen gas supply pipeline is connected to the hydrogen supply device, the outlet of the hydrogen gas supply pipeline is connected to the hydrogen inlet of the stack, and the pipeline between the inlet and the outlet of the hydrogen gas supply pipeline is provided with a second flow sensor, an eighth temperature sensor located in the pipeline downstream of the second flow sensor, a primary side of the first plate heat exchanger located in the pipeline downstream of the eighth temperature sensor, a ninth temperature sensor located in the pipeline downstream of the primary side of the first plate heat exchanger, a fourth heating zone located in the pipeline downstream of the ninth temperature sensor, and a tenth temperature sensor located in the pipeline downstream of the fourth heating zone;

[0025] The inlet of the air supply pipeline is connected to the air supply device, and the outlet of the air supply pipeline is connected to the air inlet of the fuel cell stack. The pipeline between the inlet and the outlet of the air supply pipeline is provided with a third flow sensor, a fourth temperature sensor located in the pipeline downstream of the third flow sensor, the primary side of the second plate heat exchanger located in the pipeline downstream of the fourth temperature sensor, a fifth temperature sensor located in the pipeline downstream of the primary side of the second plate heat exchanger, a fifth heating zone located in the pipeline downstream of the fifth temperature sensor, and a sixth temperature sensor located in the pipeline downstream of the fifth heating zone.

[0026] According to some embodiments of the present application, the fuel cell stack testing system further includes a controller and a drive system. The controller is connected to each temperature sensor, each flow sensor and the drive system signal. The drive system is connected to each heating belt and the multi-way valve drive. The controller drives the drive system to control the heating to adjust the temperature and control the multi-way valve to adjust the valve opening according to the temperature data collected and transmitted by the temperature sensor and the flow data collected and transmitted by the flow sensor.

[0027] Beneficial effects: The high-power heating cables and external chillers wound on the gas pipelines of the fuel cell test bench will generate a lot of power consumption. In the fuel cell stack test system of the utility model, the circulating water flowing out of the stack is divided into three paths, one of which enters the plate heat exchanger to heat the air in the stack pipeline, and then flows back to the circulating water tank. One of the circulating water enters the plate heat exchanger to heat the hydrogen in the stack pipeline, and then flows back to the circulating water tank. The remaining circulating water directly flows back to the circulating water tank. That is, for the high-temperature circulating water output by the fuel cell stack, the plate heat exchanger is first used to exchange heat with the air supply system of the gas supply system, and the heat of the high-temperature circulating water is released to the hydrogen and air supplied to the fuel cell stack, thereby reducing the heat of the circulating water itself and making the hydrogen and air reach a temperature suitable for supplying gas to the fuel cell stack. After the heat of the high-temperature circulating water is reduced once, external cooling water is further used to cool it down again through the plate heat exchanger, so that the demand for cold supply of external cooling water is significantly reduced. In addition, for the gas supply system, since the heat of the circulating water is obtained in the gas supply process, the demand for heat supply for further heating of the gas supply is also significantly reduced, thereby realizing the coordinated utilization of energy in the internal circulation of the test system and reducing external energy consumption.

[0028] The utility model also wraps a heating belt around the gas pipeline between the plate heat exchanger and the stack to assist in heating the gas. In combination with other temperature sensors, when the test temperature reaches the set temperature, the gas pipeline heating belt turns on the low-power mode, which only serves to keep the temperature. If the test temperature does not reach the set temperature, the gas pipeline heating belt turns on the high-power mode to heat the gas a second time, so that the gas supply heating of the utility model can be in different modes, which not only reduces power consumption, but also enables the system to have reliable stability.

[0029] The utility model installs a temperature sensor and a heating rod in the circulating water tank, which cooperates with other temperature sensors of the utility model. If the measured water temperature is consistent with the set water temperature at the inlet of the fuel cell stack, the circulating water will flow directly into the fuel cell stack, and the heating belt on the pipeline entering the stack will start the low-power mode, which only plays a role of heat preservation. If the water temperature in the circulating water tank is higher than the set water temperature entering the stack, the circulating water will enter the plate heat exchanger for heat exchange, and the heating belt on the pipeline will be turned off. If the water temperature in the circulating water tank is lower than the set water temperature entering the stack, the heater in the water tank will be started, and the pipeline heating belt will start the high-power mode. The circulating water treatment of the utility model can be in different modes, which not only reduces the power consumption or external cooling water consumption, but also enables the system to have reliable stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of the fuel cell stack test system.

[0031] in:

[0032] 1. Battery stack.

[0033] 2. Hydrogen supply pipeline, 3. Second flow sensor, 4. Eighth temperature sensor, 5. First plate heat exchanger, 6. Ninth temperature sensor, 7. Fourth heating belt, 8. Tenth temperature sensor.

[0034] 9. Air supply pipeline, 10. Third flow sensor, 11. Fourth temperature sensor, 12. Second plate heat exchanger, 13. Fifth temperature sensor, 14. Fifth heating belt, 15. Sixth temperature sensor.

[0035] 16. Seventh temperature sensor, 17. First flow sensor, 18. Third heating belt, 19. Multi-way valve, 20. First water outlet branch, 21. Third water outlet branch, 22. Second water outlet branch.

[0036] 23. Water tank, 24. Third temperature sensor, 25. Heating rod, 26. Stack water supply pipeline, 27. First heating belt, 28. First temperature sensor, 29. Outflowing external cooling water, 30. Third plate heat exchanger, 31 Inflowing external cooling water, 32. Second heating belt, 33. Second temperature sensor. DETAILED DESCRIPTION

[0037] Embodiments of the present application are described in detail below with reference to the accompanying drawings, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions.

[0038] like Figure 1 As shown, a fuel cell stack test system includes a hydrogen supply pipeline 2, an air supply pipeline 9 and a water circulation system, wherein the hydrogen supply pipeline 2 supplies hydrogen to the stack 1, the air supply pipeline 9 supplies air to the stack 1, and the water circulation system includes a water tank 23, a stack water supply pipeline 26 and a stack 1 water outlet pipeline, the stack water supply pipeline 26 supplies the first temperature circulating water in the water tank 23 to the stack 1 from the water tank 23, and the stack 1 water outlet pipeline supplies the second temperature circulating water of the stack 1 from the stack 1 to the water tank 23. Among them, at least one of the hydrogen supply pipeline 2 and the air supply pipeline 9 is provided with a plate heat exchanger, and the water outlet pipeline of the fuel cell stack 1 includes at least one water outlet branch, and the water outlet branch supplies the second temperature circulating water of the fuel cell stack 1 from the fuel cell stack 1 to the secondary side of the plate heat exchanger of the corresponding gas supply pipeline, and supplies it to the water tank 23 through the secondary side, and the primary side of the plate heat exchanger is the flow side corresponding to the gas supply.

[0039] In one solution, the hydrogen supply pipeline 2 is provided with a first plate heat exchanger 5, the air supply pipeline 9 is provided with a second supply pipeline, and the water outlet pipeline of the stack 1 includes a first water outlet branch 20 and a second water outlet branch 22, wherein the first water outlet branch 20 supplies the second temperature circulating water output by the stack 1 to the secondary side of the first plate heat exchanger 5 of the hydrogen supply pipeline 2, and supplies it to the water tank 23 through the secondary side of the first plate heat exchanger 5, and the primary side of the first plate heat exchanger 5 is the flow side of the hydrogen supply. The second water outlet branch 22 supplies the second temperature circulating water output by the stack 1 to the secondary side of the second plate heat exchanger 12 of the air supply pipeline 9, and supplies it to the water tank 23 through the secondary side of the second plate heat exchanger 12, and the primary side of the second plate heat exchanger 12 is the flow side of the air supply.

[0040] In one solution, the water outlet pipeline of the fuel cell stack 1 further includes at least one third water outlet branch 21 , and the third water outlet branch 21 supplies the second temperature circulating water from the fuel cell stack 1 to the water tank 23 .

[0041] The utility model aims at the high-power heating belt wound on the gas pipeline of the fuel cell test bench and the external chiller, which will generate a large amount of power consumption. In the fuel cell stack test system of the utility model, the circulating water flowing out of the stack is divided into three paths, one of which enters the plate heat exchanger to heat the air in the stack pipeline, and then flows back to the circulating water tank. One of the circulating water enters the plate heat exchanger to heat the hydrogen in the stack pipeline, and then flows back to the circulating water tank. The remaining circulating water directly flows back to the circulating water tank. That is, for the high-temperature circulating water output by the fuel cell stack, the plate heat exchanger is first used to exchange heat with the air supply system of the gas supply system, and the heat of the high-temperature circulating water is released to the hydrogen and air supplied to the fuel cell stack, thereby reducing the heat of the circulating water itself and making the hydrogen and air reach a temperature suitable for supplying gas to the fuel cell stack. After the heat of the high-temperature circulating water is reduced once, external cooling water is further used to cool it down again through the plate heat exchanger, so that the demand for cold supply of external cooling water is significantly reduced. In addition, for the gas supply system, since the heat of the circulating water is obtained in the gas supply process, the demand for heat supply for further heating of the gas supply is also significantly reduced, thereby realizing the coordinated utilization of energy in the internal circulation of the test system and reducing external energy consumption.

[0042] In one solution, the inlet of the water outlet pipeline of the battery stack 1 is connected to the circulating water outlet of the battery stack 1, the outlet of the water outlet pipeline of the battery stack 1 is connected to the inlet of the multi-way valve 19, and the inlets of the first water outlet branch 20, the second water outlet branch 22, and the third water outlet branch 21 are respectively connected to an outlet of the multi-way valve 19. The inlet and outlet of the secondary side of the first plate heat exchanger 5 are connected to the first water outlet branch 20, and the outlet of the first water outlet branch 20 is connected to an inlet of the water tank 23. The inlet and outlet of the secondary side of the second plate heat exchanger 12 are connected to the second water outlet branch 22, and the outlet of the second water outlet branch 22 is connected to an inlet of the water tank 23. The outlet of the third water outlet branch 21 is connected to an inlet of the water tank 23.

[0043] In one embodiment, a seventh temperature sensor 16 , a first flow sensor 17 located in the pipeline downstream of the seventh temperature sensor 16 , and a third heating belt 18 located in the pipeline downstream of the first flow sensor 17 are provided in the pipeline between the inlet of the water outlet pipeline of the fuel cell stack 1 and the inlet of the multi-way valve 19 .

[0044] In one solution, the inlet of the stack water supply pipeline 26 of the water circulation system is connected to the circulating water outlet of the water tank 23, and the outlet of the stack water supply pipeline 26 is connected to the circulating water inlet of the stack 1. A third plate heat exchanger 30 is arranged in the pipeline between the inlet and the outlet of the stack water supply pipeline 26, and the primary side of the third plate heat exchanger 30 is the circulating water flow side of the water tank 23, and the secondary side of the third plate heat exchanger 30 is the external cooling water flow side.

[0045] In one embodiment, a first heating belt 27 and a first temperature sensor 28 located in the pipeline downstream of the first heating belt 27 are set in the pipeline between the inlet of the stack water supply pipeline 26 and the inlet of the primary side of the third plate heat exchanger 30, and a second heating belt 32 and a second temperature sensor 33 located in the pipeline downstream of the second heating belt 32 are set between the outlet of the primary side of the third plate heat exchanger 30 and the outlet of the stack water supply pipeline 26.

[0046] In one solution, a third temperature sensor 24 and a heating rod 25 are provided in the water tank 23 of the water circulation system.

[0047] In one scheme, the inlet of the hydrogen supply pipeline 2 is connected to the hydrogen supply device, and the outlet of the hydrogen supply pipeline 2 is connected to the hydrogen inlet of the fuel cell stack 1. The pipeline between the inlet and the outlet of the hydrogen supply pipeline 2 is provided with a second flow sensor 3, an eighth temperature sensor 4 located in the downstream pipeline of the second flow sensor 3, the primary side of the first plate heat exchanger 5 located in the downstream pipeline of the eighth temperature sensor 4, a ninth temperature sensor 6 located in the downstream pipeline of the primary side of the first plate heat exchanger 5, a fourth heating zone 7 located in the downstream pipeline of the ninth temperature sensor 6, and a tenth temperature sensor 8 located in the downstream pipeline of the fourth heating zone 7. The inlet of the air supply pipeline 9 is connected to the air supply device, and the outlet of the air supply pipeline 9 is connected to the air inlet of the fuel cell stack 1. The pipeline between the inlet and the outlet of the air supply pipeline 9 is provided with a third flow sensor 10, a fourth temperature sensor 11 located in the pipeline downstream of the third flow sensor 10, the primary side of the second plate heat exchanger 12 located in the pipeline downstream of the fourth temperature sensor 11, a fifth temperature sensor 13 located in the pipeline downstream of the primary side of the second plate heat exchanger 12, a fifth heating zone 14 located in the pipeline downstream of the fifth temperature sensor 13, and a sixth temperature sensor 15 located in the pipeline downstream of the fifth heating zone 14.

[0048] In one embodiment, the fuel cell stack test system also includes a controller and a drive system, wherein the controller is connected to each temperature sensor, each flow sensor and the drive system signal, and the drive system is connected to each heating belt and the multi-way valve 19. The controller drives the drive system to control the heating to adjust the temperature and control the multi-way valve 19 to adjust the valve opening according to the temperature data collected and transmitted by the temperature sensor and the flow data collected and transmitted by the flow sensor.

[0049] According to the above-mentioned technical solutions of the present invention, the high-temperature circulating water flowing out of the fuel cell stack 1 flows through the fuel cell stack outlet pipe. The seventh temperature sensor 16 and the flow sensor 17 are installed on the fuel cell stack outlet pipe, and the detected temperature value and flow value are transmitted to the controller.

[0050] The hydrogen in the hydrogen supply pipeline 2 flows through the second flow sensor 3 and the eighth temperature sensor 4 to measure the flow rate and temperature. The temperature value and the flow rate value are transmitted to the controller.

[0051] The air in the air supply pipeline 9 flows through the third flow sensor 10 and the fourth temperature sensor 11 to measure the temperature and flow rate, and the temperature value and the flow rate value are transmitted to the controller.

[0052] The controller calculates the circulating water flow rate of the stack output required to heat each gas to the set stack entry temperature value based on the current temperature and flow rate of the gas in each gas supply pipeline, the set gas entry temperature value, and the circulating water exit temperature value. This calculation can be used Q=mcΔT, where Q is heat, m is mass, c is specific heat capacity, and ΔT is temperature change. The relationship between flow and mass can be expressed by density. The flow rate can be converted from volume flow to mass flow through the density of the fluid: mass flow = density × volume flow = ρ × Q v , where: mass flow rate is the mass flowing through the cross section per unit time, usually in kilograms per second (kg / s). ρ is the density of the fluid, in kilograms per cubic meter (kg / m³). Q v is the volume flow rate in cubic meters per second (m³ / s).

[0053] Thus, the flow values ​​of the circulating water of the first water outlet branch 20 and the second water outlet branch 22 can be determined. The remaining circulating water output by the stack flows directly back to the water tank 23 from the third water outlet branch 21. The controller transmits the calculated result to the multi-way valve 19, controls and adjusts the opening of the corresponding outlet valve, and the multi-way valve 19 distributes the circulating water flow accordingly. Among them, the controller can preferably be a PLC controller.

[0054] When the hydrogen flowing through the hydrogen supply pipeline 2 flows through the first plate heat exchanger 5, the hydrogen in the pipeline is heated by the high-temperature circulating water, and when it flows through the ninth temperature sensor 6, the temperature test is performed again. If the temperature value tested by the ninth temperature sensor 6 is consistent with the set hydrogen inlet temperature, the fourth heating belt 7 turns on the low-power mode, which only plays the effect of maintaining the gas temperature. If the temperature value tested by the ninth temperature sensor 6 is higher than the set hydrogen inlet temperature, the circulating water flow rate entering the first plate heat exchanger 5 is reduced. If the temperature value tested by the temperature sensor 6 is lower than the set hydrogen inlet temperature, the circulating water flow rate entering the first plate heat exchanger 5 is increased, that is, the circulating water flow rate is increased by adjusting the valve opening of the outlet of the multi-way valve 19 connected to the first water outlet branch 20. The tenth temperature sensor 8 tests the hydrogen inlet temperature again and feeds the result back to the controller. If the temperature test value again is consistent with the set hydrogen temperature entering the stack, the fourth heating belt 7 maintains the current power unchanged. If the temperature test value again is inconsistent with the set hydrogen temperature entering the stack, the heating power of the fourth heating belt 7 is adjusted until the temperature is consistent with the set value.

[0055] The air flowing through the air supply pipeline 9 is tested for temperature when passing through the fourth sensor 11. When passing through the second plate heat exchanger 12, the air in the pipeline is heated by high-temperature circulating water. When passing through the fifth temperature sensor 13, the temperature test is performed again. If the temperature value tested by the fifth sensor 13 is consistent with the set air temperature entering the stack, the fifth heating belt 14 turns on the low-power mode, which only plays the effect of maintaining the gas temperature. If the temperature value tested by the fifth temperature sensor 13 is higher than the set air temperature entering the stack, the circulating water flow value entering the second plate heat exchanger 12 is reduced. If the temperature value tested by the fifth temperature sensor 13 is lower than the set air temperature entering the stack, the circulating water flow value entering the second plate heat exchanger 12 is increased. The sixth temperature sensor 15 tests the air temperature entering the stack again and feeds the result back to the controller. If the test value is consistent with the set air temperature entering the stack, the fifth heating belt 12 keeps the current power unchanged. If the test value is inconsistent with the set air temperature entering the stack, the heating power of the fifth heating belt 14 is adjusted until the temperature is consistent with the set value.

[0056] A third temperature sensor 24 and a heating rod 25 are installed inside the water tank 23 (such as a circulating water tank). When the set circulating water inlet temperature is consistent with the current circulating water temperature in the water tank 23, the heating rod 25 is not turned on. At the same time, the first heating belt 27 and the second heating belt 32 are turned on, which only play a heat preservation effect. In the third plate heat exchanger 30, no external cooling water enters, and the circulating water does not exchange heat in the plate heat exchanger.

[0057] When the set circulating water inlet temperature is higher than the water temperature of the circulating water in the water tank 23, the heating rod 25 is turned on to heat the circulating water. The first heating belt 27 and the second heating belt 32 are turned on to only have a heat preservation effect. No external cooling water enters the plate heat exchanger 30. The circulating water does not exchange heat in the plate heat exchanger.

[0058] When the set circulating water inlet temperature is lower than the circulating water tank water temperature, the heating rod 25 is not turned on. At the same time, the first heating belt 27 and the second heating belt 32 are turned on, which only play a heat preservation effect. External cooling water enters the third plate heat exchanger 30 to cool the circulating water.

[0059] As described above, the utility model wraps a heating belt around the gas pipeline entering the stack between the plate heat exchanger and the fuel cell stack to assist in heating the gas. Therefore, after hydrogen and air flow out of the plate heat exchanger, a temperature test is required. The test temperature is compared with the set stack entry temperature. If the test temperature reaches the set temperature, the gas pipeline heating belt turns on the low-power mode and only serves to keep warm. If the test temperature does not reach the set temperature, the gas pipeline heating belt turns on the high-power mode to heat the gas a second time.

[0060] As mentioned above, a temperature sensor is installed in the circulating water tank to detect the water temperature. The measured water temperature in the water tank is compared with the set water temperature for entering the stack. If the measured water temperature is consistent with the set water temperature at the inlet of the fuel cell stack, the circulating water flows directly into the fuel cell stack, and the heating belt on the pipeline entering the stack turns on the low-power mode, which only plays a role in heat preservation. If the water temperature in the circulating water tank is higher than the set water temperature for entering the stack, the circulating water enters the plate heat exchanger for heat exchange, and the heating belt on the pipeline is turned off. If the water temperature in the circulating water tank is lower than the set water temperature for entering the stack, the heater in the water tank is started, and the pipeline heating belt starts the high-power mode.

[0061] The utility model discloses a fuel cell stack test system, which relates to a test bench air supply temperature control system and a circulating water temperature control system. After the circulating water leaves the stack, it passes through a four-way valve and is divided into three routes. One route is used to heat the air entering the stack through a plate heat exchanger, and then flows into a circulating water tank. One route is used to heat the hydrogen entering the stack through a plate heat exchanger, and then flows into a circulating water tank. One route returns directly to the circulating water tank. The utility model can use the high-temperature circulating water after leaving the stack to heat the gas entering the stack, which reduces the power consumption of heating the gas entering the stack on the one hand, and reduces the external cooling water consumption of cooling the circulating water on the other hand, thereby reducing the power consumption of the chiller.

[0062] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0063] In addition, the terms "first" and "second" are used for descriptive purposes only and should not 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. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0064] 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.

[0065] In the present utility model, 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.

[0066] In the present utility model, the term "and / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent three situations: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the previously associated objects are in an "or" relationship. "At least one" means one or more; "at least one of A and B" is similar to "A and / or B", describing the association relationship of associated objects, indicating that three relationships may exist. For example, at least one of A and B can represent three situations: A exists alone, A and B exist at the same time, and B exists alone.

[0067] In the present utility model, 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 utility model. 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.

[0068] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A fuel cell stack testing system, characterized in that: include A hydrogen supply pipeline (2) for supplying hydrogen to the fuel cell stack (1); An air supply pipeline (9) for supplying air to the fuel cell stack (1); A water circulation system, comprising a water tank (23), a cell stack water supply pipeline (26), and a cell stack (1) water outlet pipeline, wherein the cell stack water supply pipeline (26) supplies circulating water at a first temperature in the water tank (23) from the water tank (23) to the cell stack (1), and the cell stack (1) water outlet pipeline supplies circulating water at a second temperature of the cell stack (1) from the cell stack (1) to the water tank (23); At least one of the hydrogen supply pipeline (2) and the air supply pipeline (9) is provided with a plate heat exchanger, and the water outlet pipeline of the fuel cell stack (1) includes at least one water outlet branch, and the water outlet branch supplies the second temperature circulating water of the fuel cell stack (1) from the fuel cell stack (1) to the secondary side of the plate heat exchanger corresponding to the gas supply pipeline, and supplies it to the water tank (23) through the secondary side, and the primary side of the plate heat exchanger is the flow side corresponding to the gas supply.

2. The fuel cell stack testing system according to claim 1, characterized in that: The hydrogen gas supply pipeline (2) is provided with a first plate heat exchanger (5), the air gas supply pipeline (9) is provided with a second gas supply pipeline, and the water outlet pipeline of the fuel cell stack (1) comprises a first water outlet branch (20), the first water outlet branch (20) supplies the circulating water at the second temperature output by the fuel cell stack (1) to the secondary side of the first plate heat exchanger (5) of the hydrogen supply pipeline (2), and supplies the circulating water to the water tank (23) via the secondary side of the first plate heat exchanger (5), the primary side of the first plate heat exchanger (5) being the hydrogen supply flow side; A second water outlet branch (22), the second water outlet branch (22) supplies the second temperature circulating water output by the fuel cell stack (1) to the secondary side of the second plate heat exchanger (12) of the air supply pipeline (9), and supplies it to the water tank (23) through the secondary side of the second plate heat exchanger (12), and the primary side of the second plate heat exchanger (12) is the air supply flow side.

3. The fuel cell stack testing system according to claim 2, characterized in that: The water outlet pipeline of the cell stack (1) further comprises at least one third water outlet branch (21), and the third water outlet branch (21) supplies the second temperature circulating water from the cell stack (1) to the water tank (23).

4. The fuel cell stack testing system according to claim 3, characterized in that: The inlet of the water outlet pipeline of the cell stack (1) is connected to the circulating water outlet of the cell stack (1), the outlet of the water outlet pipeline of the cell stack (1) is connected to the inlet of a multi-way valve (19), and the inlets of the first water outlet branch (20), the second water outlet branch (22), and the third water outlet branch (21) are each connected to an outlet of the multi-way valve (19); The inlet and outlet of the secondary side of the first plate heat exchanger (5) are connected to the first water outlet branch (20), and the outlet of the first water outlet branch (20) is connected to an inlet of the water tank (23); The inlet and outlet of the secondary side of the second plate heat exchanger (12) are connected to the second water outlet branch (22), and the outlet of the second water outlet branch (22) is connected to an inlet of the water tank (23); An outlet of the third water outlet branch (21) is connected to an inlet of the water tank (23).

5. The fuel cell stack testing system according to claim 4, characterized in that: The pipeline between the inlet of the water outlet pipeline of the battery stack (1) and the inlet of the multi-way valve (19) is provided with a seventh temperature sensor (16), a first flow sensor (17) located in the pipeline downstream of the seventh temperature sensor (16), and a third heating belt (18) located in the pipeline downstream of the first flow sensor (17).

6. The fuel cell stack testing system according to claim 5, characterized in that: The inlet of the stack water supply pipeline (26) of the water circulation system is connected to the circulating water outlet of the water tank (23), and the outlet of the stack water supply pipeline (26) is connected to the circulating water inlet of the stack (1). A third plate heat exchanger (30) is arranged in the pipeline between the inlet and the outlet of the stack water supply pipeline (26), and the primary side of the third plate heat exchanger (30) is the circulating water flow side of the water tank (23), and the secondary side of the third plate heat exchanger (30) is the external cooling water flow side.

7. The fuel cell stack testing system according to claim 6, characterized in that: A first heating zone (27) and a first temperature sensor (28) located in the pipeline downstream of the first heating zone (27) are provided in the pipeline between the inlet of the stack water supply pipeline (26) and the inlet of the primary side of the third plate heat exchanger (30); a second heating zone (32) and a second temperature sensor (33) located in the pipeline downstream of the second heating zone (32) are provided between the outlet of the primary side of the third plate heat exchanger (30) and the outlet of the stack water supply pipeline (26).

8. The fuel cell stack testing system according to claim 6, characterized in that: A third temperature sensor (24) and a heating rod (25) are provided in the water tank (23) of the water circulation system.

9. The fuel cell stack testing system according to claim 7 or 8, characterized in that: The inlet of the hydrogen supply pipeline (2) is connected to the hydrogen supply device, the outlet of the hydrogen supply pipeline (2) is connected to the hydrogen inlet of the fuel cell stack (1), and the pipeline between the inlet and the outlet of the hydrogen supply pipeline (2) is provided with a second flow sensor (3), an eighth temperature sensor (4) located in the pipeline downstream of the second flow sensor (3), the primary side of the first plate heat exchanger (5) located in the pipeline downstream of the eighth temperature sensor (4), a ninth temperature sensor (6) located in the pipeline downstream of the primary side of the first plate heat exchanger (5), a fourth heating zone (7) located in the pipeline downstream of the ninth temperature sensor (6), and a tenth temperature sensor (8) located in the pipeline downstream of the fourth heating zone (7); The inlet of the air supply pipeline (9) is connected to the air supply device, the outlet of the air supply pipeline (9) is connected to the air inlet of the fuel cell stack (1), and the pipeline between the inlet and the outlet of the air supply pipeline (9) is provided with a third flow sensor (10), a fourth temperature sensor (11) located in the pipeline downstream of the third flow sensor (10), the primary side of the second plate heat exchanger (12) located in the pipeline downstream of the fourth temperature sensor (11), a fifth temperature sensor (13) located in the pipeline downstream of the primary side of the second plate heat exchanger (12), a fifth heating zone (14) located in the pipeline downstream of the fifth temperature sensor (13), and a sixth temperature sensor (15) located in the pipeline downstream of the fifth heating zone (14).

10. The fuel cell stack testing system according to claim 9, characterized in that: It also includes a controller and a drive system, wherein the controller is connected to each temperature sensor, each flow sensor and the drive system signal, and the drive system is connected to each heating belt and the multi-way valve (19) by driving. The controller drives the drive system to control heating to adjust the temperature and to control the multi-way valve (19) to adjust the valve opening according to the temperature data collected and transmitted by the temperature sensor and the flow data collected and transmitted by the flow sensor.

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