Auxiliary test equipment and method for blow-by test of fuel cell

Abstract

The invention discloses fuel cell blow-by test auxiliary test equipment and method, the fuel cell blow-by test auxiliary test equipment comprises a test box, the test box is suitable for placing an electric pile of a fuel cell, the electric pile is provided with three chambers, and the test box is provided with an air inlet and an air outlet; the air tightness testing device at least comprises an air inflation device and a flow detection device, the air inflation device is suitable for selectively inflating two of the three cavities to preset air pressure, and the flow detection device is suitable for detecting the air supply flow value of the two inflated cavities; and the air pressure balancing device is respectively communicated with the air inlet and the air outlet and is used for enabling the air pressure in the test box to be equal to the preset air pressure. The auxiliary testing equipment for the blow-by test of the fuel cell has the advantages of being accurate and reliable in detection and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cell manufacturing, and in particular to a fuel cell blowby test auxiliary test equipment and a fuel cell blowby test auxiliary test method. Background Art

[0002] Hydrogen fuel cell stacks must undergo an airtightness test before they are officially installed and used. The results of the airtightness test directly determine whether the battery is qualified and can be installed and used.

[0003] The fuel cell air tightness test equipment in the related technology relies on a gas flow meter to collect and record the blowby gas leakage value or the amount of gas replenishment. Taking the blowby gas test from the hydrogen chamber, the air chamber to the cooling water chamber as an example, after the hydrogen chamber and the air chamber are pressurized, the hydrogen chamber and the air chamber are used as the inflation chamber and the cooling water chamber is used as the blowby gas chamber. A flow meter is installed in the cooling water chamber loop to collect the value of the gas passing through the flow meter as the blowby gas leakage value, or a flow meter is installed in the front-end air intake pipeline to calculate the blowby gas leakage value by collecting and recording the amount of gas replenishment. However, during the inflation process, after the inflation chamber is pressurized, while leaking into the blowby gas chamber, it is also leaking into the external environment. The actual leakage amount is very different from the data recorded by the flow meter, and the authenticity of the test data cannot be reflected.

[0004] In addition, if the flow meter is set in the blowby chamber loop, there will be residual air in the blowby chamber before the test begins. During the test, the residual air will also pass through the flow meter and be recorded by the flow meter, resulting in an error between the recorded value and the actual leakage value. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a fuel cell blowby test auxiliary test device, which has the advantages of accurate and reliable detection.

[0006] The invention also provides a fuel cell blowby test auxiliary test method.

[0007] To achieve the above-mentioned purpose, according to an embodiment of the first aspect of the present invention, a fuel cell blowby test auxiliary test equipment is proposed, and the fuel cell blowby test auxiliary test equipment includes: a test box, the test box is suitable for placing a fuel cell stack, the stack has three chambers, and the test box is provided with an air inlet and an exhaust port; an airtight test device, the airtight test device at least includes an inflation device and a flow detection device, the inflation device is suitable for selectively inflating two of the three chambers to a predetermined air pressure and the flow detection device is suitable for detecting the air replenishment flow value of the two inflated chambers; an air pressure balancing device, the air pressure balancing device is respectively connected to the air inlet and the exhaust port and is used to make the air pressure in the test box equal to the predetermined air pressure.

[0008] The auxiliary test equipment for fuel cell blowby test according to the embodiment of the present invention has the advantages of accurate and reliable detection.

[0009] In addition, the fuel cell blowby test auxiliary test equipment according to the above embodiment of the present invention may also have the following additional technical features:

[0010] According to one embodiment of the present invention, the air pressure balancing device at least includes: an air source; a reversing valve, the reversing valve being connected to the air source, the air inlet and the exhaust port respectively, the reversing valve being switchable between an air intake state in which the air source and the air inlet are connected and the air source and the exhaust port are disconnected, and an exhaust state in which the air source and the exhaust port are connected and the air source and the air inlet are disconnected; and a control device, the control device being electrically connected to the reversing valve.

[0011] According to one embodiment of the present invention, the air pressure balancing device also includes: a pressure regulating handle, which is arranged on the test box and electrically connected to the control device; and a pressure gauge, which is arranged on the test box and is used to detect and display the pressure in the test box.

[0012] According to one embodiment of the present invention, the air pressure balancing device also includes: an air supply pipe, one end of which is connected to the air source and the other end is connected to the reversing valve; an air intake pipe, one end of which is connected to the air inlet and the other end is connected to the reversing valve; an exhaust pipe, one end of which is connected to the exhaust port and the other end is connected to the reversing valve.

[0013] According to one embodiment of the present invention, an intake pressure sensor and a flow meter are connected to the intake pipe, an exhaust pressure sensor is connected to the exhaust pipe, and the intake pressure sensor, the exhaust pressure sensor and the flow meter are all electrically connected to the control device.

[0014] According to one embodiment of the present invention, the air intake pipe is connected to an air intake pneumatic valve, the air exhaust pipe is connected to an exhaust pneumatic valve, and the air supply pipe is connected to a filter and a pressure reducing valve.

[0015] According to one embodiment of the present invention, the control device is a programmable logic controller and is connected to a power supply system, wherein the power supply system includes a fuse, a circuit breaker and a power supply, and the control device is electrically connected to the power supply via the fuse and the circuit breaker.

[0016] According to one embodiment of the present invention, the test box includes: a box body; a box cover, wherein the box cover is openably and closably arranged on the box body, and a locking device is arranged between the box cover and the box body.

[0017] According to one embodiment of the present invention, the airtight testing device further comprises three gas filling tubes, and the three gas filling tubes are respectively suitable for being connected to the three chambers of the fuel cell stack.

[0018] According to an embodiment of the second aspect of the present invention, a fuel cell blowby test auxiliary test method is provided, comprising the following steps:

[0019] Place the fuel cell stack into the test chamber;

[0020] Inflating two of the three chambers of the fuel cell stack to a predetermined pressure;

[0021] Adjusting the air pressure in the test box so that the air pressure in the test box is equal to the predetermined air pressure;

[0022] The gas supplement flow value of the two inflated chambers within a predetermined time is detected.

[0023] The auxiliary test method for fuel cell blowby test according to the embodiment of the present invention has the advantages of accurate and reliable detection.

[0024] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0026] Figure 1 Schematic diagram of the structure of a fuel cell blowby test auxiliary test equipment according to an embodiment of the present invention.

[0027] Figure 2 4 is a flow chart of a fuel cell blowby test auxiliary test method according to an embodiment of the present invention.

[0028] Figure symbols: fuel cell blowby test auxiliary test equipment 1, test box 10, box body 11, box cover 12, air inlet 13, exhaust port 14, locking device 15, handle 16, airtight test device 20, charging tube 21, air pressure balance device 30, air source 31, reversing valve 32, control device 33, safety device 331, circuit breaker 332, power supply 333, voltage conversion device 334, pressure regulating handle 34, pressure gauge 35, air supply pipe 36, filter 361, pressure reducing valve 362, air intake pipe 37, intake pressure sensor 371, flow meter 372, intake pneumatic valve 373, exhaust pipe 38, exhaust pressure sensor 381, exhaust pneumatic valve 382, ​​fuel cell stack 2. DETAILED DESCRIPTION

[0029] The present invention is based on the findings of the inventors of this application regarding the following facts and problems:

[0030] The fuel cell air tightness test equipment in the related technology relies on a gas flowmeter to collect and record the blowby gas leakage value or the amount of gas replenishment. Taking the blowby gas test from the hydrogen chamber and the air chamber to the cooling water chamber as an example, after the hydrogen chamber and the air chamber are pressurized, a flowmeter is installed in the cooling water chamber circuit to collect the value of the gas passing through the flowmeter as the blowby gas leakage value, or a flowmeter is installed in the air intake pipeline at the front end of the cooling water pipeline to calculate the blowby gas leakage value by collecting and recording the amount of gas replenishment. However, during the inflation process, after the inflation chamber is pressurized, while leaking into the blowby gas chamber, it also leaks into the external environment. The actual leakage amount is very different from the data recorded by the flowmeter, and the authenticity of the test data cannot be reflected.

[0031] To this end, some fuel cell airtightness testing equipment places the battery stack in a test container for testing, and determines whether the battery stack is leaking by detecting the pressure change in the test container, or detects whether the battery stack has pressure changes by detecting the pressure change in the test container. This can prevent the gas in the battery stack from leaking into the environment, but both can only perform qualitative detection of whether the battery stack is leaking, and it is difficult to achieve quantitative detection of the specific leakage amount of the battery stack.

[0032] Embodiments of the present invention are described in detail below, 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. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0033] 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 positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] The following describes a fuel cell blowby test auxiliary test device 1 according to an embodiment of the present invention with reference to the accompanying drawings.

[0036] like Figure 1 and Figure 2 As shown, the fuel cell blowby test auxiliary test equipment 1 according to an embodiment of the present invention includes a test box 10 , an airtight test device 20 and an air pressure balancing device 30 .

[0037] The test box 10 is suitable for placing a fuel cell stack 2, which has three chambers. The test box 10 is provided with an air inlet 13 and an exhaust port 14. The airtight test device 20 at least includes an air filling device and a flow detection device. The air filling device is suitable for selectively filling two of the three chambers to a predetermined air pressure and the flow detection device is suitable for detecting the air filling flow value of the two inflated chambers. The air pressure balance device 30 is respectively connected to the air inlet 13 and the exhaust port 14 and is used to make the air pressure in the test box 10 equal to the predetermined air pressure.

[0038] Specifically, the airtight testing device 20 may be an airtight testing device in the related art.

[0039] It can be understood by those skilled in the art that the "predetermined air pressure" can be set according to actual needs. The "flow rate value of the flow detection device for the two inflated chambers" can be achieved by setting a flow meter on the inflated pipeline, and the gas leaked out of the inflatable chamber is replenished by the inflatable device, and the gas flow value replenished into the inflatable chamber is the gas replenishment flow value of the inflatable chamber, so that the gas flow value of the gas leakage of the inflatable chamber can be reflected by the gas replenishment flow value of the inflatable chamber.

[0040] For example, the three chambers of the fuel cell stack 2 may be a hydrogen chamber, an air chamber, and a cooling water chamber, respectively, and the airtightness testing device 20 may inflate two of the hydrogen chamber, the air chamber, and the cooling water chamber and detect the gas replenishment flow values ​​of the two inflated chambers. For example, the inflating device of the airtightness testing device 20 may inflate the hydrogen chamber and the air chamber, and detect the gas replenishment values ​​of the hydrogen chamber and the air chamber through the flow detection device.

[0041] Reference below Figure 1 and Figure 2The working process of the fuel cell blowby test auxiliary testing device 1 according to the embodiment of the present invention is described.

[0042] First, the battery stack 2 to be tested is placed in the test box 10, and two of the three chambers of the battery stack 2 are inflated to a predetermined air pressure using the inflation device of the airtight test device 20. The air pressure in the test box 10 is adjusted through the air inlet 13 and the exhaust port 14 using the air pressure balancing device 30, so that the air pressure in the test box 10 is equal to the predetermined air pressure. In other words, the air pressure in the test box 10 is equal to the air pressure in the two chambers of the battery stack 2 that are inflated, so that the pressure in the inflated chamber of the battery stack 2 is balanced with that in the test box 10. Finally, the air replenishment value of the two inflation chambers within a predetermined time is detected to obtain the blowby leakage value of the battery stack 2, which can be used as the blowby leakage value.

[0043] According to the fuel cell blowby test auxiliary test equipment 1 of the embodiment of the present invention, by setting up a test box 10 and an air pressure balancing device 30, the battery stack 2 can be placed in the test box 10 for a blowby test. The air pressure in the test box 10 is controlled by the air pressure balancing device 30, so that the battery stack 2 can be in an environment with controllable air pressure, and the air pressure in the test box 10 is adjusted to be equal to the inflation air pressure of the battery stack 2 by the air pressure balancing device 30, so that the air pressure in the inflation chamber of the battery stack 2 can be equal to the air pressure in the test box 10, so that the battery stack 2 is in an environment with balanced internal and external air pressures. Since the internal and external pressures of the battery stack 2 are balanced, compared with the fuel cell blowby test test equipment summarized in the related art, the gas in the inflation chamber of the battery stack 2 will not leak into the external environment but will only blowby into the uninflated blowby chamber. At this time, detecting the air replenishment value of the inflation chamber can more realistically reflect the blowby value from the inflation chamber to the blowby chamber, thereby avoiding the influence of gas leakage to the external environment on the detection result, and making the detection result more accurate and reliable.

[0044] Furthermore, the flow detection device detects the air replenishment value of the inflation chamber instead of directly detecting the gas flow passing through the blowby chamber. Compared with the technical solution in the related art of setting the flow meter in the blowby chamber loop, this can avoid the flow detection device recording the air remaining in the blowby chamber before the test, which leads to an error between the recorded value and the actual leakage value, thereby avoiding the influence of the air remaining in the blowby chamber of the fuel cell stack 2 before the test on the detection result, and further improving the accuracy of the detection result.

[0045] Therefore, the fuel cell blowby test auxiliary testing equipment 1 according to the embodiment of the present invention has the advantages of accurate and reliable detection.

[0046] The following describes a fuel cell blowby test auxiliary test device 1 according to a specific embodiment of the present invention with reference to the accompanying drawings.

[0047] In some specific embodiments of the present invention, Figure 1As shown, the fuel cell blowby test auxiliary test equipment 1 according to an embodiment of the present invention includes a test box 10 , an airtight test device 20 and an air pressure balancing device 30 .

[0048] Specifically, Figure 1 As shown, the air pressure balancing device 30 at least includes an air source 31, a reversing valve 32 and a control device 33. The reversing valve 32 is connected to the air source 31, the air inlet 13 and the exhaust port 14 respectively, and the reversing valve 32 can be switched between an air intake state in which the air source 31 is connected to the air inlet 13 and the air source 31 and the exhaust port 14 are disconnected, and an exhaust state in which the air source 31 and the exhaust port 14 are connected and the air source 31 and the air inlet 13 are disconnected. The control device 33 is electrically connected to the reversing valve 32. Specifically, the reversing valve 32 can be an electromagnetic reversing valve. In this way, the air source 31 can be controlled by the control device 33 to inflate or exhaust the test box 10, thereby realizing the regulation of the air pressure in the test box 10.

[0049] Alternatively, if Figure 1 As shown, the air pressure balancing device 30 also includes a pressure regulating handle 34 and a pressure gauge 35. The pressure regulating handle 34 is provided on the test box 10 and is electrically connected to the control device 33. The pressure gauge 35 is provided on the test box 10 and is used to detect and display the pressure in the test box 10. In this way, the operator can adjust the pressure in the test box 10 by referring to the pressure gauge 35 through the pressure regulating handle 34, thereby facilitating manual adjustment of the pressure in the test box 10.

[0050] More specifically, Figure 1 As shown, the air pressure balance device 30 also includes an air supply pipe 36, an air intake pipe 37 and an exhaust pipe 38. One end of the air supply pipe 36 is connected to the air source 31 and the other end is connected to the reversing valve 32. One end of the air intake pipe 37 is connected to the air inlet 13 and the other end is connected to the reversing valve 32. One end of the exhaust pipe 38 is connected to the exhaust port 14 and the other end is connected to the reversing valve 32. This makes it easier to connect the air source 31, the reversing valve 32 and the test box 10.

[0051] Furthermore, if Figure 1 As shown, an intake pressure sensor 371 and a flow meter 372 are connected to the intake pipe 37, and an exhaust pressure sensor 381 is connected to the exhaust pipe 38. The intake pressure sensor 371, the exhaust pressure sensor 381 and the flow meter 372 are all electrically connected to the control device 33. In this way, the control device 33 can control the reversing valve 32 according to the detection values ​​of the pressure sensor and the flow meter, so as to control the pressure in the test box 10.

[0052] Furthermore, if Figure 1As shown, an air intake pneumatic valve 373 is connected to the air intake pipe 37, an air exhaust pneumatic valve 382 is connected to the air exhaust pipe 38, and a filter 361 and a pressure reducing valve 362 are connected to the air supply pipe 36. The pneumatic valve can control the conduction direction of the air intake pipe 37 and the air exhaust pipe 38, the filter 361 can filter the gas at the air source 31, and the pressure reducing valve 362 can reduce and stabilize the gas at the air source 31.

[0053] Figure 1 The fuel cell blowby test auxiliary test equipment 1 according to some examples of the present invention is shown. Figure 1 As shown, the test box 10 includes a box body 11 and a box cover 12. The box cover 12 is openably disposed on the box body 11, and a locking device 15 is disposed between the box cover 12 and the box body 11. Specifically, the box cover 12 is provided with a handle 16. This makes it easy to put the battery stack 2 into the test box 10, and the locking device 15 can ensure the sealing of the test box 10 after the box cover 12 is closed.

[0054] Specifically, Figure 1 As shown, the control device 33 is a programmable logic controller (PLC) and is connected to a power supply system, the power supply system includes a safety device 331, a circuit breaker 332 and a power supply 333, and the control device 33 is electrically connected to the power supply 333 through the safety device 331 and the circuit breaker 332. Specifically, the power supply 333 can be a 220V power supply, and the power supply system can also include a voltage conversion device 334, which is suitable for converting the 220V power supply into a 24V power supply. In this way, the programmable logic controller can be used to control the air pressure of the test box 10, and the power supply system can facilitate the power supply to the control device 33.

[0055] More specifically, Figure 1 As shown, the airtight test device 20 also includes three gas filling tubes 21, and the three gas filling tubes 21 are respectively suitable for being connected to the three chambers of the battery stack 2. Specifically, the box body 11 is provided with a pipe opening adapted to the gas filling tube 21. This makes it easy to connect the airtight test device 20 to the three chambers of the battery stack 2. Specifically, the three chambers of the battery stack 2 can be a hydrogen chamber, an air chamber, and a cooling water chamber, respectively, and the three gas filling tubes 21 can be a hydrogen chamber gas filling tube, an air chamber gas filling tube, and a cooling water chamber gas filling tube, respectively, and are connected to the three chambers one by one.

[0056] Reference below Figure 1 and Figure 2 The working process of the fuel cell blowby test auxiliary testing device 1 according to the embodiment of the present invention is described.

[0057] Open the locking device 15 of the test box 10, open the box cover 12 by pulling up the handle 16, put the battery stack 2 into the test box 10, connect the hydrogen cavity filling tube, the air cavity filling tube and the cooling water cavity filling tube to the anode inlet, cathode inlet and cooling water inlet of the battery stack 2 respectively, and seal the anode outlet, cathode outlet and cooling water outlet of the battery stack, put down the handle 16 to close the box cover 12, lock the locking device 15, and the installation of the battery stack 2 is completed.

[0058] Taking the gas blowby test from the hydrogen chamber and the air chamber to the cooling water chamber as an example, after the airtight test device 20 is turned on, the air pressure balance device 30 is turned on, and the hydrogen chamber and the air chamber of the fuel cell stack 2 are inflated through the inflation device of the airtight test device 20 to reach a predetermined air pressure. At this time, the gas at the gas source 31 of the air pressure balancing device 30 passes through the filter 361, the pressure reducing valve 362, and the reversing valve 32 in sequence, and is fed back to the reversing valve 32 and the flow meter 372 through the control device 33, and then the air intake pneumatic valve 373 is opened. The gas enters the test box 10 through the air intake pipe 37. After the test box 10 is filled with gas, the pressure value in the test box 10 is displayed by the pressure gauge 35 and is fed back to the control device 33 by the air intake pressure sensor 371. The operator adjusts the pressure value by operating the pressure regulating handle 34. When adjusting the pressure, the control device 33 will open the exhaust pipe 38 to replenish air according to the pressure in the test box 10, or exhaust through the exhaust pipe 38 by opening the exhaust pneumatic valve 382 and control the reversing of the reversing valve 32 to ensure that the air pressure in the test box 10 is consistent with the predetermined pressure of the fuel cell stack 2. At this time, the pressures in the hydrogen cavity and the air cavity in the test box 10 and the fuel cell stack 2 are balanced.

[0059] Afterwards, within a predetermined time, the gas replenishment values ​​of the hydrogen chamber and the air chamber are collected by the flow detection device of the airtight testing device 20, which are the leakage values ​​of the gas blowby from the hydrogen chamber and the air chamber to the cooling water chamber of the fuel cell stack 2.

[0060] Reference below Figure 2 The fuel cell blowby test auxiliary test method according to an embodiment of the present invention is described, comprising the following steps:

[0061] Place the fuel cell stack into the test chamber;

[0062] Inflating two of the three chambers of the fuel cell stack to a predetermined pressure;

[0063] Adjusting the air pressure in the test box so that the air pressure in the test box is equal to the predetermined air pressure;

[0064] The gas supplement flow value of the two inflated chambers within a predetermined time is detected.

[0065] By taking the air replenishment flow value as the blowby gas leakage value within the predetermined time, quantitative detection of the specific leakage amount of the fuel cell stack can be achieved.

[0066] The auxiliary test method for fuel cell blowby test according to the embodiment of the present invention has the advantages of accurate and reliable detection.

[0067] Other structures and operations of the fuel cell blowby test auxiliary test device 1 according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0068] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means 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 representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0069] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A fuel cell blowby test auxiliary test equipment, characterized in that: include: A test box, wherein the test box is suitable for placing a fuel cell stack, the fuel cell stack has three chambers, and the test box is provided with an air inlet and an exhaust port; An airtight test device, the airtight test device at least comprising an air filling device and a flow detection device, the air filling device is suitable for selectively filling two of the three chambers to a predetermined air pressure and the flow detection device is suitable for detecting the air filling flow value of the two inflated chambers; An air pressure balancing device is connected to the air inlet and the air outlet respectively and is used to make the air pressure in the test box equal to the predetermined air pressure.

2. The fuel cell blowby test auxiliary test equipment according to claim 1, characterized in that: The air pressure balancing device at least comprises: Gas source; a reversing valve, the reversing valve being connected to the gas source, the gas inlet, and the gas outlet, respectively, and the reversing valve being switchable between a gas inlet state in which the gas source and the gas inlet are connected and the gas source and the gas outlet are disconnected, and a gas outlet state in which the gas source and the gas inlet are connected and the gas source and the gas inlet are disconnected; A control device is electrically connected to the reversing valve.

3. The fuel cell blowby test auxiliary test equipment according to claim 2, characterized in that: The air pressure balancing device also includes: A voltage regulating handle, which is arranged on the test box and is electrically connected to the control device; A pressure gauge is arranged on the test box and is used to detect and display the pressure in the test box.

4. The fuel cell blowby test auxiliary test equipment according to claim 2, characterized in that: The air pressure balancing device also includes: An air supply pipe, one end of which is connected to the air source and the other end of which is connected to the reversing valve; An air intake pipe, one end of which is connected to the air intake port and the other end of which is connected to the reversing valve; An exhaust pipe, one end of which is connected to the exhaust port and the other end of which is connected to the reversing valve.

5. The fuel cell blowby test auxiliary test equipment according to claim 4, characterized in that: The intake pipe is connected to an intake pressure sensor and a flow meter, the exhaust pipe is connected to an exhaust pressure sensor, and the intake pressure sensor, the exhaust pressure sensor and the flow meter are all electrically connected to the control device.

6. The fuel cell blowby test auxiliary test equipment according to claim 4, characterized in that: The air intake pipe is connected to an air intake pneumatic valve, the air exhaust pipe is connected to an air exhaust pneumatic valve, and the air supply pipe is connected to a filter and a pressure reducing valve.

7. The fuel cell blowby test auxiliary test equipment according to claim 2, characterized in that: The control device is a programmable logic controller and is connected to a power supply system. The power supply system includes a safety device, a circuit breaker and a power supply. The control device is electrically connected to the power supply through the safety device and the circuit breaker.

8. The fuel cell blowby test auxiliary test equipment according to claim 1, characterized in that: The test box comprises: Box body; A box cover is openably and closably arranged on the box body, and a locking device is arranged between the box cover and the box body.

9. The fuel cell blowby test auxiliary test equipment according to claim 1, characterized in that: The airtight testing device also includes three filling tubes, and the three filling tubes are respectively suitable for being connected to the three chambers of the fuel cell stack.

10. A fuel cell blowby test auxiliary test method, characterized in that: The following steps are involved: Place the fuel cell stack into the test chamber; Inflating two of the three chambers of the fuel cell stack to a predetermined pressure; Adjusting the air pressure in the test box so that the air pressure in the test box is equal to the predetermined air pressure; The gas supplement flow value of the two inflated chambers within a predetermined time is detected.

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