Stack shell sealing performance detection method, device and equipment and storage medium

Abstract

The invention discloses an electric pile shell sealing performance detection method, device and equipment and a storage medium. The technical problems that in the prior art, a proton exchange membrane is prone to being pressed and damaged, and no corresponding evaluation standard exists are solved. The detection method comprises the following steps: plugging a to-be-detected galvanic pile shell purging outlet and a medium through hole; introducing gas into a purging inlet of the shell; detecting the pressure in the shell, and if the pressure is always smaller than a first preset pressure, judging that the sealing performance of the galvanic pile shell does not meet the requirement; if the pressure reaches the first preset pressure and the leakage rate is not greater than the preset rate, judging that the sealing performance of the galvanic pile shell meets the requirement; and if the leakage rate is greater than the preset rate, judging that the sealing performance of the galvanic pile shell does not meet the requirement. According to the invention, gas is introduced from the purging inlet, so that the proton membrane cannot be damaged, and the operation is simple; meanwhile, the invention provides a method for determining the preset rate of the electric pile shell sealing performance test, and a shell sealing performance evaluation standard is established.

Description

Technical Field

[0001] The present application belongs to the field of fuel cell technology, and specifically relates to a method, device, equipment and storage medium for detecting the sealing performance of a fuel cell shell. Background Art

[0002] A fuel cell stack is a power generation device that uses hydrogen as fuel and directly converts chemical energy into electrical energy. It has the advantages of high energy conversion efficiency, clean and pollution-free, and a wide range of fuel sources. In actual applications, the core cannot be completely sealed due to factors such as the processing level of the stack components, the attenuation of assembly force, and the gas barrier properties of the sealing material itself. Therefore, the sealing of the fuel cell stack shell is particularly important. It is necessary to prevent the hydrogen leaking from the core from continuing to leak out of the shell to ensure the safety of the hydrogen outside the stack shell; it is also necessary to prevent pollutants and water vapor in the external environment from entering the shell and causing damage or corrosion to the internal components.

[0003] The battery stack shell is usually composed of a box body and multiple cover plates, and is equipped with high-pressure, low-pressure, water-gas interfaces, etc. The box body, cover plates, and interfaces are sealed by sealing rings. Since the sealing path of the sealing ring is long and is easily affected by many factors such as sealing materials and cross-sections, sealing force, dust and other impurities, it is necessary to test the sealing of the battery stack shell.

[0004] At present, the sealing of the battery stack shell is generally tested by the soaking method, that is, the tested battery stack modules are all immersed in water to a certain depth. After a period of time, the outer shell is disassembled to observe whether water has entered the battery stack module to determine the shell sealing test. This method is simple and intuitive to operate, but water ingress will affect the insulation of the battery stack body. In order to solve the problem of easy water ingress in the soaking method, the prior art usually adopts the three-chamber air intake test, usually sealing the hydrogen, air, and cooling path flow channel outlets of the battery stack, and introducing a certain pressure of test gas into the hydrogen, air, and cooling path flow channel inlets of the battery stack. After the air pressure stabilizes, read whether the gas leakage is within the allowable range, but it may cause the pressure difference between the hydrogen cavity and the air cavity to be too large, which may cause the proton exchange membrane to be compressed and damaged, and there is a lack of corresponding evaluation standards for judging whether the sealing is qualified. Summary of the invention

[0005] In order to solve the above problems, the present application provides a method, device, equipment and storage medium for detecting the sealing performance of a fuel cell shell.

[0006] In a first aspect of the present application, a method for detecting the sealing performance of a stack housing is provided, which is applied to a fuel cell and comprises the following steps:

[0007] The purge outlet and the medium opening of the shell of the fuel cell stack to be tested are blocked;

[0008] Passing gas into a purge inlet of a housing of a fuel cell stack to be tested;

[0009] detecting the pressure in the shell, and if the pressure is always less than a first preset pressure within a set time, determining that the sealing performance of the stack shell does not meet the requirements;

[0010] If the pressure reaches a first preset pressure within a set time, the gas flow rate in the purge inlet of the shell is monitored, and the average leakage rate value when the gas flow rate is stable is used as the leakage rate of the shell;

[0011] The leakage rate is compared with the preset rate. If the leakage rate is not greater than the preset rate, it is determined that the sealing of the fuel cell shell meets the requirements; if the leakage rate is greater than the preset rate, it can be determined that the sealing of the fuel cell shell does not meet the requirements.

[0012] In some embodiments, before comparing the leakage rate with a preset rate, the stack housing sealing detection method further includes:

[0013] After the pressure value in the shell reaches the second preset pressure P1, stop supplying gas to the purge inlet, and record the time Δt when the pressure drop value ΔP in the shell reaches the preset pressure difference;

[0014] According to the formula Calculate the preset rate v max , where V0 is the volume of the cavity between the core and the encapsulating shell.

[0015] In some embodiments, the preset pressure difference ΔP is 1% to 5% of the second preset pressure P1; and the second preset pressure is equal to the first preset pressure.

[0016] In some embodiments, the cavity volume is determined by:

[0017] In the process of introducing gas into the purge inlet, obtaining a curve of the change of the gas flow rate and time;

[0018] According to the formula The cavity volume V0 is calculated, where: t0 is the time when the gas flow reaches a stable state.

[0019] In some implementations, when the fluctuation range of the gas flow is within ±3%, the gas flow is determined to be stable.

[0020] In some embodiments, after the gas flow is stabilized, the stack casing sealing detection method further includes: the leakage rate value is an average leakage rate of the gas flow within a second preset time after the gas flow continues to be in a stable state for a first preset time.

[0021] In a second aspect of the present application, a detection device for implementing the above-mentioned stack housing sealing detection method is provided, comprising:

[0022] Purge gas source;

[0023] a pressure regulating unit, connected to the gas outlet of the purge gas source through a pressure regulating pipeline, and used for controlling the pressure of the pressure regulating pipeline to reach a first preset pressure;

[0024] A flow meter, connected to the pressure regulating unit and the purge inlet via a flow pipeline, for obtaining the gas flow in the flow pipeline;

[0025] The plugging unit is used to seal the purge outlet and the medium opening.

[0026] In some embodiments, the pressure regulating unit includes a pressure regulating valve, an air inlet valve, and a gas pressure gauge connected in sequence;

[0027] The blocking unit includes a blocking pipeline and an air outlet valve arranged on the blocking pipeline.

[0028] In a third aspect of the present application, a device is provided, including a processor and a memory, wherein the memory stores computer program instructions that can be executed by the processor, and when the processor executes the computer program instructions, the steps of the above method are implemented.

[0029] In a fourth aspect of the present application, a storage medium is provided, wherein the computer-readable storage medium stores computer program instructions, and when the computer program instructions are executed by a processor, the processor is prompted to implement the steps of the above-mentioned method.

[0030] According to the method, device, equipment and storage medium for detecting the sealing performance of the stack shell provided by one or more embodiments of the present application, the method for detecting the sealing performance of the stack shell is applied to fuel cells, and the method for detecting the sealing performance of the stack shell includes sealing both the purge outlet and the medium outlet of the shell of the fuel cell stack to be detected; introducing gas into the purge inlet of the shell of the fuel cell stack to be detected; detecting the pressure in the shell, and if the pressure is always less than a first preset pressure within a set time, determining that the sealing performance of the stack shell does not meet the requirements; if the pressure reaches the first preset pressure within the set time, monitoring the gas flow in the purge inlet of the shell, and taking the average leakage rate value when the gas flow is stable as the leakage rate of the shell; comparing the leakage rate with the preset rate, and if the leakage rate is not greater than the preset rate, determining that the sealing performance of the stack shell meets the requirements; if the leakage rate is greater than the preset rate, it can be determined that the sealing performance of the stack shell does not meet the requirements.

[0031] The present application blocks both the purge outlet and the medium port, and passes gas from the purge inlet. The gas enters the cavity between the core and the packaging shell. The gas does not need to be passed through the medium port for detection, thereby not causing damage to the proton membrane. The operation is simple, and solves the problem in the prior art that the shell sealing is difficult to detect and the proton membrane is at risk of being damaged due to air intake from the three chamber ports of the fuel cell stack, and the shell sealing is judged more accurately. By judging the sealing of the shell, it is prevented that the hydrogen accumulated in the cavity between the core and the shell due to the sealing problem of the shell leaks to the outside of the shell, thereby ensuring the hydrogen safety outside the fuel cell stack shell.

[0032] In addition, the present application proposes a method for determining the upper limit of the leakage rate of the stack shell sealing test, i.e., the preset rate. The preset rate can be easily determined according to the test pressure and duration, and the specific configuration of the stack shell, such as the main factor affecting V0, and a shell sealing evaluation standard is established. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic flow chart of a method for detecting the sealing performance of a stack casing in one or more embodiments of the present application is shown.

[0034] Figure 2 A schematic diagram of a curve showing a change in gas flow rate over time in one or more embodiments of the present application is shown.

[0035] Figure 3 A schematic structural diagram of a fuel cell stack casing sealing detection device in one or more embodiments of the present application is shown.

[0036] Figure 4 A schematic structural diagram of a fuel cell stack sealing detection device in one or more embodiments of the present application is shown.

[0037] Explanation of the reference numerals: 100 - stack shell sealing detection device, 110 - purge gas source, 120 - pressure regulating unit, 121 - pressure regulating valve, 122 - air inlet valve, 123 - gas pressure gauge, 130 - gas flow meter, 140 - blocking unit, 141 - blocking pipeline, 142 - air outlet valve, 200 - shell, 210 - purge inlet, 220 - purge outlet, 230 - cavity, 300 - core, 400 - bus, 401 - receiver, 402 - processor, 403 - transmitter, 404 - memory, 405 - bus interface. DETAILED DESCRIPTION

[0038] In order to make the technical personnel in the technical field to which the present application belongs to understand the present application more clearly, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0039] See also Figure 1 and Figure 3 As shown, the first embodiment of the present application provides a method for detecting the sealing performance of a fuel cell stack housing, which is applied to a fuel cell, and includes the following steps: The method includes steps S10 to S50:

[0040] In step S10, the purge outlet 220 and the medium opening of the housing of the fuel cell stack to be inspected are blocked. In other words, all openings in the housing except the purge inlet 210 need to be blocked.

[0041] Before testing, it is necessary to ensure that the fuel cell stack casing is in a cold state and there is no liquid water or other media inside to avoid other media affecting the test results.

[0042] It is understandable that the purge outlet 220 and the medium port of the shell are closed before detection. In some embodiments, in order to prevent other openings of the battery stack shell from affecting the detection method, it is necessary to block other openings of the battery stack shell. In some embodiments, the medium port is taken as a three-cavity port as an example, wherein the three-cavity ports are the hydrogen inlet, hydrogen outlet, air inlet, air outlet, cooling path flow channel inlet, and cooling path flow channel outlet of the battery stack. That is, before detection, the hydrogen inlet, hydrogen outlet, air inlet, air outlet, cooling path flow channel inlet, and cooling path flow channel outlet of the battery stack need to be blocked to ensure that in subsequent detection, the normal inlet and outlet of the shell will not affect the subsequent detection results, and the gas will not leak from the normal inlet and outlet of the shell, thereby avoiding affecting the detection results.

[0043] In some implementations, the three-cavity openings of the fuel cell stack shell are sealed by installing a cover plate or closing the inlet and outlet valves of the three-cavity openings to seal the hydrogen inlet, hydrogen outlet, air inlet, air outlet, cooling path flow inlet, and cooling path flow outlet of the fuel cell stack.

[0044] Thus, by blocking all openings in the shell except the purge inlet 210, it can be ensured that after the gas is introduced into the purge inlet 210, as the volume of the introduced gas gradually increases, the gas can gradually fill the cavity 230 between the core 300 inside the shell and the packaging shell, thereby facilitating subsequent detection.

[0045] In some embodiments, the purge outlet 220 of the shell can be blocked by connecting a blocking pipeline to the purge outlet 220 and setting an air outlet valve 142 on the blocking pipeline. When blocking is required, the air outlet valve 142 is closed to block the purge outlet 220.

[0046] In some embodiments, in order to further simplify the detection method, only a simple module of the fuel cell stack can be assembled to perform the shell sealing test, that is, only the shell and its accessories are assembled, and the core 300 does not need to be assembled into the shell. This helps to improve the efficiency of assembly and sealing testing and avoid the air pressure during the sealing test from having an adverse effect on the core 300.

[0047] In step S20 , gas is introduced into the purge inlet 210 of the housing of the fuel cell stack to be inspected.

[0048] In some embodiments, if the gas introduced into the purge inlet is provided by an external gas cylinder, the gas may be nitrogen or an inert gas. If there is a core 300 in the shell, nitrogen or an inert gas is introduced to prevent the introduced gas from remaining in the core 300 during the detection process, thereby affecting the performance of the core 300. When nitrogen or an inert gas is introduced, the gas performance is relatively stable and will not produce adverse effects with air, hydrogen, etc. Therefore, when the gas is nitrogen or an inert gas, while ensuring that the shell air tightness test can be carried out, the effect on the performance of the core 300 is relatively small.

[0049] In addition, if the gas introduced into the purge inlet shares a common gas source with the air subsystem, as shown in Appendix 3, in other embodiments, the purge gas source 110 is connected to the air supply system of the fuel cell system to be tested through a gas supply pipeline. In this case, the device for detecting the sealing of the shell 200 can be shared with the purge device of the shell 200, both of which are provided by the air supply system of the fuel cell system, for example, the clean air provided by the air compressor is led out to a branch, and only the pressure regulating valve 121, the air inlet valve 122, the gas pressure gauge 123, the gas flow meter 130, and the air outlet valve 142 need to be added.

[0050] In step S30, the pressure in the shell is detected. If the pressure is always less than the first preset pressure within a set time, it is determined that the sealing performance of the stack shell does not meet the requirements.

[0051] It is understandable that, since all openings of the shell except the purge inlet 210 are blocked, gas is introduced into the purge inlet 210 of the shell. Under normal circumstances, if the sealing performance of the shell meets the requirements, the gas introduced from the purge inlet 210 can fill the cavity inside the shell, so the air pressure inside the shell increases with the increase of the gas capacity inside the shell. If the sealing performance of the shell does not meet the requirements, the gas introduced from the purge inlet 210 will leak while filling the cavity inside the shell, so the speed of filling the cavity inside the shell is relatively slow, and the air pressure inside the shell will also increase relatively slowly, and there may even be a situation where the air pressure does not change much.

[0052] Therefore, when gas is introduced into the shell of the fuel cell stack, if the sealing of the shell does not meet the requirements and there is a large leakage, then as the gas flow rate increases, the test pressure may never reach the first preset pressure, and it can be directly determined that the sealing of the shell does not meet the requirements.

[0053] In step S40, if the pressure reaches the first preset pressure within the set time, the gas flow in the purge inlet 210 of the shell is monitored, and the average leakage rate value when the gas flow is stable is used as the leakage rate v of the shell. test ;

[0054] In other words, if the leakage of the shell is relatively small or the shell sealing meets the requirements, then as the gas flow increases, the test pressure will reach the first preset pressure. At this time, it is impossible to directly determine whether the shell sealing meets the requirements, and further analysis and judgment through other data is required.

[0055] In some embodiments, after gas is introduced into the shell for a certain period of time and the shell is pressurized to a first preset pressure, the gas flow rate will decrease and stabilize after a period of time. The stabilized gas flow rate is the flow rate of leakage from the shell to the outside. The average leakage rate over a period of time can be calculated as the leakage rate of the shell, thereby judging the sealing performance of the shell.

[0056] In step S50, the leakage rate is compared with a preset rate. If the leakage rate v test Not greater than the preset rate v max When the leakage rate v test Greater than the preset rate v max When the leakage occurs, it can be determined that the sealing of the stack shell does not meet the requirements.

[0057] In some embodiments, when the test stack casing leakage rate v test Not greater than the upper limit of the leakage rate, i.e. the preset rate v max , that is, v test ≤v maxWhen , it can be determined that the sealing of the stack shell meets the requirements, and it is believed that the hydrogen accumulated in the cavity 230 between the core 300 and the shell will not leak out of the shell, and will not cause hydrogen safety risks outside the shell.

[0058] In other embodiments, when the stack casing leakage rate v is obtained by testing test Greater than the upper limit of the leakage rate, i.e. the preset rate v max , that is, v test >v max When the stack shell sealing fails, it can be determined that the stack shell sealing does not meet the requirements, and it is necessary to investigate and improve many factors such as the shell sealing material and cross-section, sealing force, dust and other impurities.

[0059] In some embodiments, there are many factors that affect the sealing of the stack housing. Depending on the test pressure and duration, the specific configuration of the stack housing, etc., the upper limit of the leakage rate, i.e., the preset rate referred to in this application, is also different. This application can also calculate the preset rate v max In the prior art, the pressure difference method usually takes a long time to monitor the pressure drop and is not widely used. The present application can convert and calculate the preset rate based on the pressure difference method evaluation method.

[0060] Before comparing the leakage rate with the preset rate, the method for detecting the sealing performance of the stack casing further includes step S41.

[0061] Step S41: After the pressure value in the shell reaches the second preset pressure P1, stop introducing gas into the purge inlet, and record the time Δt when the pressure drop value in the shell reaches the preset pressure difference ΔP; according to the formula Calculate the preset rate v max , where V0 is the volume of the cavity between the core and the encapsulating shell.

[0062] In other words, before comparing the leakage rate with the preset rate, the shell is continuously pressurized until the pressure value in the shell reaches the second preset pressure P1. In the process of the pressure value reaching the second preset pressure P1, there may be a small fluctuation. Therefore, the pressure value reaching the second preset pressure P1 means that the gas is stopped from being introduced into the purge inlet 210 after the pressure value reaches the second preset pressure P1 and the pressure is stabilized. Since the gas is stopped from being introduced into the purge inlet after stabilization, the pressure in the shell will drop due to normal leakage or abnormal leakage. The time Δt when the pressure drop value in the shell reaches the preset pressure difference ΔP is recorded, and the preset rate Wherein V0 is the volume of the cavity 230 between the core and the packaging shell.

[0063] It can be understood that the flow method is used to obtain the leakage rate v testAfter the gas flow rate is detected to be stable, the pressure in the shell will drop slightly, so it is necessary to increase the pressure in the shell again so that the pressure value in the shell reaches the second preset pressure P1.

[0064] In some embodiments, the preset pressure difference ΔP is 1% to 5% of the second preset pressure P1; the pressure drop value ΔP can also be adaptively adjusted according to actual conditions, and can be 3%, 2.7%, 2.5% or 2%.

[0065] In other embodiments, the second preset pressure is equal to the first preset pressure, and the second preset pressure P1 and the first preset pressure are both greater than the standard atmospheric pressure.

[0066] According to the ideal gas law, before the gas is stopped from being introduced into the purge inlet, that is, before the leakage begins, the gas state in the stack shell can be expressed by the formula P1V1=n1RT1, where P1 is the set second preset pressure, V1 is the volume of the cavity 230 in the stack shell, n1 is the number of moles of gas, R is the ideal gas constant, and T1 is the test temperature.

[0067] After the leakage occurs, part of the gas escapes from the stack shell. The state of the gas after the leakage can be expressed by the formula P2V2=n2RT2: where P2 is the pressure inside the shell after the pressure drops for a period of time Δt, V2 is the volume of the cavity 230 in the stack shell, n2 is the number of moles of gas, R is the ideal gas constant, and T2 is the test temperature.

[0068] In some embodiments, V1=V2=V0 can be set, where V0 is the volume of the cavity 230 between the stack core 300 and the packaging shell; since the leakage process occurs slowly, the gas is close to isothermal, that is, T1=T2=T0, where T0 is the test environment temperature. The amount of the substance leaking in the gas within the time Δt is Δn; The volume of leaked gas within Δt is ΔV; The preset gas velocity is v max ; Depending on the test pressure and duration, the specific configuration of the fuel cell shell, etc., this formula can be used to calculate the upper limits of different leakage rates.

[0069] In some embodiments, the volume V0 of the cavity 230 between the core 300 and the encapsulating shell can be obtained by theoretical calculation, actual measurement and other methods. Considering that the outer contour boundary of the core 300 is relatively complex, including tie rods, end plates, copper bars, voltage patrollers, wiring harnesses and other components, and the shell is provided with many insulation and fixing brackets, it is inconvenient to obtain V0. In other embodiments, the volume V0 of the cavity 230 between the core 300 and the encapsulating shell can also be obtained by obtaining the corresponding gas flow rate change curve over time, and the volume V0 is calculated through the change curve.

[0070] In the process of introducing gas into the purge inlet, a curve of the change of gas flow rate and time is obtained, as shown in the attached figure. Figure 2 As shown, the value of the gas flow rate shows a downward trend over time and stabilizes after a period of time t0. After stabilization, the flow meter reading fluctuates within ±3%. In some embodiments, the value of the gas flow rate is obtained by a flow meter.

[0071] When t=0-t0, the gas introduced into the purge inlet 210 of the shell passes through the flow meter and enters the cavity 230 between the core 300 and the shell through the purge inlet, and gradually fills the cavity 230; when t=t0, the cavity 230 is filled, and the cumulative volume of the test gas introduced is the volume of the cavity 230, which can be obtained by integrating the flow rate with time, that is, When t>t0, the cavity 230 is full, and the flow meter reading is the leakage of the shell to the outside. That is, the present application can obtain the volume V0 of the cavity 230 between the core 300 and the packaging shell through the curve of the change of gas flow over time.

[0072] In some embodiments, taking a certain stack shell sealing test as an example, the shell sealing test pressure P1 = 1.3P0, P0 is the standard atmospheric pressure; the pressure holding time Δt = 20min, the set pressure drop value ΔP ≤ 3% P1, the volume of the cavity 230 between the core 300 and the packaging shell V0 = 5L, and the preset rate of the test gas is calculated accordingly.

[0073] Therefore, the present application proposes a method for determining a preset rate for a stack shell sealing test. The preset rate can be easily determined based on the test pressure and duration, and the specific configuration of the stack shell, such as the main factor affecting V0, and a shell sealing evaluation standard is established.

[0074] In some embodiments, the gas flow is determined to be stable when the fluctuation range of the gas flow is within ±3%.

[0075] It is understandable that when gas is introduced into the purge inlet 210, the gas flow rate will change. When the gap in the shell is filled with gas, that is, the gas flow rate of the purge inlet 210 will decrease over time and tend to a stable state. The gas flow rate in the stable state is the leakage of the shell to the outside. Therefore, when the fluctuation range of the gas flow rate is within ±3%, for example, the fluctuation range of the gas flow rate is ±3%, ±2.7%, ±2.1%, ±2%, ±1.7%, ±1.2%, ±1% or ±0.3%, the gas flow rate is considered to be stable.

[0076] In some embodiments, after the gas flow rate is stable, the stack housing sealing detection method further includes: a leakage rate value vtest The average leakage rate of the gas flow in the second preset time after the gas flow continues to be in a stable state for the first preset time. The first preset time is recorded as t1, the second preset time is recorded as t2, and the leakage rate value v test It is the average leakage rate of the gas flow within the second preset time t2 after the gas flow continues to be in a stable state for the first preset time t1.

[0077] It is understood that the gas flow value is obtained by the gas flow meter. If the test pressure can be pressurized to the first preset pressure, after a period of time, the gas flow meter reading decreases and tends to be stable. Stability here means that the gas flow meter reading fluctuates within ±3%. In some embodiments, the first preset time is t 1＝ 3min, the second preset time is t 2＝ 1min, gas flow rate remains stable 1＝ After 3 minutes, record the gas flow rate and then 2＝ The average leakage rate of 1 minute is the leakage rate v of the stack shell. test .

[0078] Therefore, the present application can determine the upper limit of the leakage rate, that is, the preset rate v according to the fuel cell stack housing sealing test method. max According to the different test pressure and duration, the specific configuration of the stack shell, such as the main influence V0, the upper limit of the leakage rate, i.e. the preset rate v, can be easily determined. max , the shell sealing evaluation standard was established. When the stack shell leakage rate v test Not greater than the upper limit of the leakage rate, i.e. the preset rate v max , that is, v test ≤v max When the stack shell leakage rate v is , it can be determined that the sealing of the stack shell meets the requirements, and it is considered that the hydrogen accumulated in the cavity 230 between the core 300 and the shell will not leak out of the shell, and will not cause hydrogen safety risks outside the shell. test Greater than the upper limit of the leakage rate, i.e. the preset rate v max , that is, v test >v max When the stack shell sealing fails, it can be determined that the stack shell sealing does not meet the requirements, and it is necessary to investigate and improve many factors such as the shell sealing material and cross-section, sealing force, dust and other impurities.

[0079] Therefore, the present application adopts the air intake method from the purge port of the fuel cell shell, which solves the problem in the prior art that the shell sealing is difficult to detect and the proton membrane is at risk of damage due to the air intake from the three-cavity port of the fuel cell, and more accurately judges the shell sealing, avoids the leakage of hydrogen accumulated in the cavity 230 between the core 300 and the shell to the outside of the shell, and ensures the hydrogen safety outside the fuel cell shell.

[0080] In a second aspect of the present application, a detection device for implementing the above-mentioned stack shell sealing detection method is provided. As shown in Appendix 3, the stack shell sealing detection device 100 includes a purge gas source 110, a pressure regulating unit 120, a flow meter and a plugging unit, wherein the purge gas source 110 is provided with a gas outlet; the pressure regulating unit 120 is connected to the gas outlet of the purge gas source through a pressure regulating pipeline, which is used to control the pressure of the pressure regulating pipeline to reach a first preset pressure; the flow meter is connected to the pressure regulating unit 120 and the purge inlet through a flow pipeline, which is used to obtain the gas flow in the flow pipeline; the plugging unit is used to close the purge outlet and the medium port.

[0081] As shown in Appendix 3, in some embodiments, the pressure regulating unit 120 includes a pressure regulating valve 121, an air inlet valve 122 and a gas pressure gauge 123 connected in sequence. The flow meter is a gas flow meter 130, the pressure regulating valve 121 can be used to detect the adjustment of the process pressure, the gas pressure gauge 123 can be used to obtain the corresponding pressure value; the gas flow meter 130 can be used to obtain the corresponding gas flow value.

[0082] As shown in Appendix 3, in some embodiments, the blocking unit 140 includes a blocking pipeline 141 and an air outlet valve 142 arranged on the blocking pipeline 141; the blocking pipeline 141 can be connected to the purge outlet 220, and the air outlet valve 142 can be arranged on the blocking pipeline 141. When blocking is required, the air outlet valve 142 can be closed to achieve the blocking of the purge outlet 220; the medium port can be blocked by installing a cover plate or closing the three-chamber inlet and outlet valves.

[0083] Based on the same inventive concept, in the third aspect of the present application, the embodiment of the present application also provides a fuel cell stack sealing detection device, referring to Figure 4 , shows a schematic diagram of the structure of a fuel cell stack sealing detection device in an embodiment of the present application, wherein the fuel cell stack sealing detection device includes one or more memories 404, one or more processors 402, and at least one computer program (computer program instruction) stored in the memory 404 and executable on the processor 402, and the processor 402 implements the method described above when executing the computer program.

[0084] Among them, Figure 4In the embodiment of the present invention, a bus architecture (represented by bus 400) is shown, which may include any number of interconnected buses and bridges, and bus 400 links various circuits including one or more processors represented by processor 402 and memory represented by memory 404. Bus 400 may also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and are therefore not further described herein. Bus interface 405 provides an interface between bus 400 and receiver 401 and transmitter 403. Receiver 401 and transmitter 403 may be the same element, namely a transceiver, providing a unit for communicating with various other devices over a transmission medium. Processor 402 is responsible for managing bus 400 and general processing, while memory 404 may be used to store data used by processor 402 when performing operations.

[0085] Based on the same inventive concept, in the fourth aspect of the present application, an embodiment of the present application provides a computer-readable storage medium, in which computer program instructions are stored. When the computer program instructions are executed by a processor, the processor is prompted to implement the steps of the method as described above.

[0086] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored as one or more instructions or codes on a computer-readable medium or transmitted via a computer-readable medium. Other examples and implementations are within the scope and spirit of the present application and the appended claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hard wiring, or a combination of any of these. In addition, each functional unit may be integrated into a processing unit, each unit may exist physically separately, or two or more units may be integrated into one unit.

[0087] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0088] The units described as separate components may or may not be physically separated, and the components of the control device may or may not be physical units, that is, they may be located in one place or distributed in multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0089] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly or all or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, disk or optical disk, etc., which can store computer program instructions.

[0090] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0091] In the description of the present application, 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" and "counterclockwise" 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 application 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 application.

[0092] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0093] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0094] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A method for detecting the sealing performance of a stack casing, applied to a fuel cell, characterized in that: The steps include: The purge outlet and the medium opening of the shell of the fuel cell stack to be tested are blocked; Passing gas into a purge inlet of a housing of a fuel cell stack to be tested; detecting the pressure in the shell, and if the pressure is always less than a first preset pressure within a set time, determining that the sealing performance of the stack shell does not meet the requirements; If the pressure reaches a first preset pressure within a set time, the gas flow rate in the purge inlet of the shell is monitored, and the average leakage rate value when the gas flow rate is stable is used as the leakage rate of the shell; The leakage rate is compared with the preset rate. If the leakage rate is not greater than the preset rate, it is determined that the sealing of the fuel cell shell meets the requirements; if the leakage rate is greater than the preset rate, it can be determined that the sealing of the fuel cell shell does not meet the requirements.

2. The method for detecting the sealing performance of a stack casing according to claim 1, characterized in that: Before comparing the leakage rate with the preset rate, the stack housing sealing detection method further includes: After the pressure value in the shell reaches the second preset pressure P1, stop supplying gas to the purge inlet, and record the time Δt when the pressure drop value in the shell reaches the preset pressure difference ΔP; According to the formula Calculate the preset rate v max , where V0 is the volume of the cavity between the core and the encapsulating shell.

3. The method for detecting the sealing performance of a stack casing according to claim 2, characterized in that: The preset pressure difference ΔP is 1% to 5% of the second preset pressure P1; the second preset pressure is equal to the first preset pressure.

4. The method for detecting the sealing performance of a stack casing according to claim 2, characterized in that: The cavity volume V0 is determined by the following method: In the process of introducing gas into the purge inlet, obtaining a curve of the change of the gas flow rate and time; According to the formula The cavity volume V0 is calculated, where: t0 is the time when the gas flow reaches a stable state.

5. The method for detecting the sealing performance of a stack casing according to any one of claims 1 to 4, characterized in that: When the fluctuation range of the gas flow is within ±3%, the gas flow is determined to be stable.

6. The method for detecting the sealing performance of a stack casing according to any one of claims 1 to 4, characterized in that: After the gas flow is stabilized, the stack casing sealing detection method further includes: the leakage rate value is an average leakage rate of the gas flow within a second preset time after the gas flow continues to be in a stable state for a first preset time.

7. A detection device for implementing the stack housing sealing detection method according to any one of claims 1 to 6, characterized in that: include: Purge gas source; a pressure regulating unit, connected to the gas outlet of the purge gas source through a pressure regulating pipeline, and used for controlling the pressure of the pressure regulating pipeline to reach a first preset pressure; A flow meter, connected to the pressure regulating unit and the purge inlet through a flow pipeline, for obtaining the gas flow in the flow pipeline; The plugging unit is used to seal the purge outlet and the medium opening.

8. The stack casing sealing detection device according to claim 7, characterized in that: The pressure regulating unit comprises a pressure regulating valve, an air inlet valve and a gas pressure gauge connected in sequence; The blocking unit includes a blocking pipeline and an air outlet valve arranged on the blocking pipeline.

9. A device comprising a processor and a memory, characterized in that: The memory stores computer program instructions that can be executed by the processor, and when the processor executes the computer program instructions, the steps of the method according to any one of claims 1 to 6 are implemented.

10. A storage medium, wherein the computer-readable storage medium stores computer program instructions, and when the computer program instructions are executed by a processor, the processor is prompted to implement the steps of the method according to any one of claims 1 to 6.

Images