CN114942108A

CN114942108A - Fuel cell three-cavity pressure maintaining equipment

Info

Publication number: CN114942108A
Application number: CN202210558355.7A
Authority: CN
Inventors: 不公告发明人
Original assignee: Cavendi Xuzhi Hydrogen Shanghai Technology Co ltd
Current assignee: Cavendi Xuzhi Hydrogen Shanghai Technology Co ltd
Priority date: 2022-05-20
Filing date: 2022-05-20
Publication date: 2022-08-26

Abstract

The invention discloses a fuel cell three-cavity pressure maintaining device, belonging to the technical field of fuel cells, comprising a test gas supply mechanism, a test gas discharge mechanism, a galvanic pile inlet and outlet electromagnetic valve group, a pressure monitoring mechanism and a control terminal, wherein the test gas supply mechanism is respectively communicated with a hydrogen cavity, a cavity and a water cavity inlet of a fuel cell galvanic pile through pipelines, the test gas discharge mechanism is connected with the hydrogen cavity, the cavity and the water cavity outlet of the fuel cell galvanic pile through pipelines, gas is introduced into the fuel cavity, an oxidant cavity and a coolant cavity of the fuel cell galvanic pile through the combined control among different valves, then software is used for controlling the opening and closing of different valves and regulating the pressure, and the front and back pressure and the flow of each cavity of the tested fuel cell galvanic pile are monitored, thereby achieving the test requirements meeting the national standard, and the whole device has self-detection, self-calibration function, flexible and variable using place.

Description

Fuel cell three-cavity pressure maintaining equipment

Technical Field

The invention relates to the technical field of fuel cells, in particular to three-cavity pressure maintaining equipment for a fuel cell.

Background

With the explosive development of the automobile hydrogen fuel cell industry, the demand of the corresponding fuel cell stack is increasing continuously. A fuel cell is an electrochemical cell that converts the chemical energy of a fuel (typically hydrogen) and an oxidant (typically oxygen) into electrical energy through a redox reaction. Unlike most batteries, fuel cells require a continuous source of fuel and oxygen (typically from air) to sustain the chemical reaction, whereas in batteries the chemical energy is typically from metals and their ions or oxides already present in the battery (except for flow batteries). The fuel cell can continuously generate electricity as long as fuel and oxygen are supplied.

The air tightness of the fuel cell stack has a great influence on the performance of the fuel cell, so that the air tightness of the fuel cell stack needs to be detected in the production process of the fuel cell stack. The tightness is very critical, the leakage of the gas in the fuel cell to the outside of the fuel cell can reduce the efficiency of the fuel cell, and simultaneously can cause great economic loss, and when the concentration of the fuel gas in the outside is accumulated to a certain degree, the fuel gas can explode. Therefore, the tightness detection of the fuel cell is particularly important, and for this reason, a three-cavity pressure maintaining device of the fuel cell is provided.

Disclosure of Invention

The invention aims to provide three-cavity pressure maintaining equipment for a fuel cell, which can realize the automatic pressure maintaining test of three cavities by introducing gas into a fuel cavity, an oxidant cavity and a coolant cavity of the fuel cell through the combined control among different valves, has higher portability, and is simple and practical.

In order to solve the problems, the invention adopts the following technical scheme:

the utility model provides a three chamber pressurize equipment of fuel cell, includes test gas supply mechanism, test gas exhaust mechanism, galvanic pile import and export solenoid valve group, pressure monitoring mechanism and control terminal, test gas supply mechanism passes through the pipeline respectively with hydrogen chamber, cavity and the water cavity import intercommunication of fuel cell galvanic pile, and test gas exhaust mechanism passes through the exit linkage of pipeline and hydrogen chamber, cavity and the water cavity of fuel cell galvanic pile, galvanic pile import and export solenoid valve group is including setting up a plurality of solenoid valves on the pipeline of the import and export of fuel cell galvanic pile hydrogen chamber, cavity and water cavity, pressure monitoring mechanism is including setting up a plurality of pressure sensor on the pipeline of the import of fuel cell galvanic pile hydrogen chamber, cavity and water cavity, galvanic pile import and export solenoid valve group and pressure monitoring mechanism all with control terminal electric connection.

As a preferable scheme of the invention, the stack inlet and outlet solenoid valve set comprises a hydrogen path inlet solenoid valve SOV309, an air path inlet solenoid valve SOV310, a water path inlet solenoid valve SOV311, a water path inlet solenoid valve SOV312, an air path outlet solenoid valve SOV310SOV313 and a hydrogen path outlet solenoid valve SOV 314.

As a preferable aspect of the present invention, the pressure monitoring mechanism includes a PI303, a PI304, and a PI305, and the PI303, the PI304, and the PI305 are respectively disposed between the stack inlet/outlet electromagnetic valve set and an inlet of a hydrogen cavity, a cavity, and a water cavity of the fuel cell stack.

As a preferable aspect of the present invention, a test gas inlet shutoff valve HV301 is provided between the test gas supply mechanism and the test gas source, and the test gas supply mechanism is provided with supply circuits corresponding to the hydrogen chamber, the cavity, and the water chamber of the fuel cell stack, respectively, and the plurality of supply circuits are communicated with each other by a three-way valve SOV303 and a three-way valve SOV 306.

In a preferred embodiment of the present invention, a plurality of proportional pressure control valves are provided in each circuit of the test gas supply unit.

As a preferable aspect of the present invention, a plurality of pressure relief valves are provided in each circuit of the test gas supply unit.

In a preferred embodiment of the present invention, a plurality of flow meters are provided in each circuit of the test gas supply unit.

As a preferable aspect of the present invention, the test gas discharge mechanism includes an exhaust valve SOV315, an exhaust valve SOV307, an exhaust valve SOV316, and an exhaust valve SOV308, and the exhaust valve SOV315, the exhaust valve SOV307, the exhaust valve SOV316, and the exhaust valve SOV308 are respectively provided corresponding to a plurality of circuits of the test gas supply mechanism.

In a preferred embodiment of the present invention, the supply pressure of the test gas source is 20 MPa.

As a preferable aspect of the present invention, the test gas can use one of inert gases.

Compared with the prior art, the invention has the advantages that:

this scheme is through the combination control between the different valves, let in fuel cell's fuel chamber with gas, the oxidant chamber, the coolant chamber, carry out the switching of controlling different valves with software afterwards and adjust pressure, and to being surveyed pressure around each cavity of fuel cell pile, the flow is monitored, thereby reach the experimental requirement that realizes according with national standard, and complete equipment possesses the self-detection, the self calibration function, the place of use is nimble variable, can external air supply, can use self gas holder as the air supply and regard as the test, and the use gas can be inert gas, also can be through changing explosion-proof spare part, use hydrogen etc. as the use gas, portability has been improved, simple and practical, it is automatic.

Drawings

FIG. 1 is a diagram of a test loop according to the present invention.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example (b):

referring to fig. 1, a fuel cell three-cavity pressure maintaining device includes a testing gas supply mechanism, a testing gas exhaust mechanism, a stack inlet and outlet electromagnetic valve set, a pressure monitoring mechanism and a control terminal, wherein the testing gas supply mechanism is respectively communicated with inlets of a hydrogen cavity, a cavity and a water cavity of a fuel cell stack through pipelines, the testing gas exhaust mechanism is connected with outlets of the hydrogen cavity, the cavity and the water cavity of the fuel cell stack through pipelines, the stack inlet and outlet electromagnetic valve set includes a plurality of electromagnetic valves arranged on pipelines of inlets and outlets of the hydrogen cavity, the cavity and the water cavity of the fuel cell stack, the pressure monitoring mechanism includes a plurality of pressure sensors arranged on pipelines of inlets of the hydrogen cavity, the cavity and the water cavity of the fuel cell stack, the stack inlet and outlet electromagnetic gas source set and the pressure monitoring mechanism are both electrically connected with the control terminal, the supply pressure of the testing is 20MPa, the test gas can be one of inert gases.

In a preferred embodiment of the present invention, a plurality of proportional pressure regulating valves are disposed on each circuit of the test gas supply mechanism, and the proportional pressure regulating valves include pocpc 301 and pocpc 302.

As a preferable aspect of the present invention, a plurality of pressure relief valves are provided on each circuit of the test gas supply mechanism, the pressure relief valves include PRV301, PRV302, PRV303, and PRV304, and pressure relief thresholds of the PRV301, the PRV302, the PRV303, and the PRV304 respectively correspond to preset maximum values of the line pressures.

In a preferred embodiment of the present invention, a plurality of flow meters are disposed on each circuit of the test gas supply mechanism, and each flow meter includes PG301 and FM 301.

As a preferable aspect of the present invention, the test gas exhaust mechanism includes an exhaust valve SOV315, an exhaust valve SOV307, an exhaust valve SOV316 and an exhaust valve SOV308, and the exhaust valve SOV315, the exhaust valve SOV307, the exhaust valve SOV316 and the exhaust valve SOV308 are respectively provided corresponding to a plurality of circuits of the test gas supply mechanism.

The first embodiment is as follows: self-check of system

Before the air tightness test of the electric pile, the air tightness self-check of the test bench is needed to ensure the accuracy of the subsequent air tightness test of the electric pile.

From self-test, the drain valve SOV315 is closed, as well as the stack inlet and outlet solenoid valves SOV309, 310, 311, 312, 313 and 314, and the solenoid valves SOV301, 304, 305 and 316 are opened. The nitrogen inlet shut-off valve was opened and the pressure was slowly increased to 130kPag (or 150% of the maximum operating pressure). And (3) waiting for the readings of all the pressure sensors and the flow meters to be stable, closing the air inlet stop valve and all the electromagnetic valves, maintaining the pressure for 20min, and monitoring the readings of all the pressure sensors and the flow meters to change, wherein the pressure should be kept unchanged during the pressure maintaining. If the pressure changes, the pipe section with air leakage can be found out by observing the position of the sensor with the pressure change. After the self-test is completed, the evacuation valves SOV315, 307, 316 and 308 are opened in sequence to release all the compressed gas inside the stack/module.

Example two: air tightness test

The air tightness test of the galvanic pile is to use nitrogen as a medium, three cavities (a hydrogen cavity, a cavity and a water cavity) of the galvanic pile are communicated, the pressures of the three cavities are kept equal, and the air tightness test device is used for testing the total external leakage from three channels (a hydrogen channel, an empty channel and a water channel) to the atmosphere and determining the allowable working pressure of the fuel cell pile and the pressure resistance characteristic of a cooling water channel. The overpressure test can also be performed simultaneously in the same way.

In the test, the corresponding inlet and outlet of the electric pile and the test equipment are firstly connected according to the identification, and then the emptying valves SOV315 and SOV316 and the proportional pressure regulating valve POPCV302 are closed to shield unnecessary pipeline branches. The

SOVs

301, 304, 305, 308, 309, 310 and 311 are opened. The nitrogen inlet shut-off valve was opened and the pressure was slowly increased to 130kPag (or 150% of the maximum operating pressure). And (3) waiting for the readings of all the pressure sensors and the flow meter to be stable, closing the air inlet stop valve and the air inlet electromagnetic valve SOV301, 304 and 305, maintaining the pressure for 20min, and monitoring the readings of the pressure sensors and the flow meter to change. During the pressure holding period, the pressure corresponding to the three chambers (pressure sensors PI303, 304 and 305) should be less than 5 kPag.

After the test is completed, the stack three way outlet SOV312, 313 and 314, SOV316 and 308, with the evacuation valves SOV315 and 307 open, releasing all the compressed gas inside the stack/module.

Example three: three-cavity differential pressure test

The pressure difference test of three cavities of the galvanic pile takes nitrogen as a medium, and specific pressure difference is caused between any two cavities in the three cavities of the galvanic pile, so that the blow-by gas leakage quantity between the two cavities is detected, and the test comprises hydrogen blow-by, hydrogen blow-by water, air blow-by water and hydrogen air blow-by water leakage tests.

Take a hydrogen blow-by leak test as an example. In the test, firstly, corresponding inlets and outlets of the galvanic pile and test equipment are connected according to the identification, then the emptying valve SOV315 and the proportional pressure regulating valve POPCV302 are closed, and unnecessary pipeline branches are shielded. The SOV301 is opened, the three-way valves 303 and 306 are switched to the NC loop, and the hydrogen chamber inlet SOV310 and the cavity inlet SOV309 are opened, as well as the SOVs 308, 312 and the purge valve SOV307, and the SOVs 311, 313 and 314 are closed. Solenoid valves SOV316, 304 are opened while the nitrogen inlet shut-off valve is opened to slowly increase the hydrogen, air two-chamber pressure to a pressure of 30kPag (or 125% of the maximum operating pressure). After all pressure sensor and flow meter readings have stabilized, the inlet solenoid valve SOV301 and the cavity inlet SOV309 are closed, the SOVs 308 and 310 are kept open, and then the proportional pressure regulating valve POPCV302 is opened to continue pressurizing the hydrogen cavity to 50kPag (or 150% of the maximum operating pressure). And after the pressure is stable, closing the air inlet stop valve, the proportional pressure regulating valve and the hydrogen cavity inlets SOV310 and 308, maintaining the pressure for 10min, and monitoring the indication changes of the pressure sensor and the flowmeter. In the above operation, the pressure change of both chambers after 10min should be less than 5 kPag. If the hydrogen chamber gas pressure decreases and the chamber gas pressure increases, this indicates that the gas has penetrated the membrane; whereas if the pressure drop on either side is not correlated with the other side, an end leak occurs; if the pressure on both sides is reduced, an external leak is likely to occur. After the test is completed, the solenoid valves SOV308, 309 and 310 are first opened to communicate the two chambers so that the two chamber pressures are the same, and the exhaust valves SOV315 and 307 are opened to release all the compressed gas inside the stack/module.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the equivalent replacement or change according to the technical solution and the modified concept of the present invention should be covered by the scope of the present invention.

Claims

1. The utility model provides a three chamber pressurize equipment of fuel cell which characterized in that: including test gas supply mechanism, test gas exhaust mechanism, galvanic pile import and export electromagnetic valve group, pressure monitoring mechanism and control terminal, test gas supply mechanism passes through the pipeline respectively with the hydrogen chamber of fuel cell galvanic pile, cavity and water cavity import intercommunication, and test gas exhaust mechanism passes through the exit linkage in hydrogen chamber, cavity and the water cavity of pipeline and fuel cell galvanic pile, galvanic pile import and export electromagnetic valve group is including setting up a plurality of solenoid valves on the pipeline of the import and export of fuel cell galvanic pile hydrogen chamber, cavity and water cavity, pressure monitoring mechanism is including setting up a plurality of pressure sensor on the pipeline of the import of fuel cell galvanic pile hydrogen chamber, cavity and water cavity, galvanic pile import and export electromagnetic valve group and pressure monitoring mechanism all with control terminal electric connection.

2. The three-chamber pressure maintaining device of a fuel cell according to claim 1, characterized in that: the electromagnetic valve group for the inlet and the outlet of the galvanic pile comprises a hydrogen path inlet electromagnetic valve SOV309, an air path inlet electromagnetic valve SOV310, a water path inlet electromagnetic valve SOV311, a water path inlet electromagnetic valve SOV312, an air path outlet electromagnetic valve SOV310SOV313 and a hydrogen path outlet electromagnetic valve SOV 314.

3. The three-cavity pressure maintaining device of the fuel cell according to claim 2, characterized in that: the pressure monitoring mechanism comprises a PI303, a PI304 and a PI305, and the PI303, the PI304 and the PI305 are respectively arranged between the stack inlet/outlet electromagnetic valve group and inlets of a fuel cell stack hydrogen cavity, a cavity and a water cavity.

4. The three-cavity pressure maintaining device of the fuel cell according to claim 3, wherein: a test gas inlet stop valve HV301 is arranged between the test gas supply mechanism and the test gas source, the test gas supply mechanism is respectively provided with supply loops corresponding to a hydrogen cavity, a cavity and a water cavity of the fuel cell stack, and the supply loops are communicated with one another through a three-way valve SOV303 and a three-way valve SOV 306.

5. The three-cavity pressure maintaining device of the fuel cell according to claim 4, wherein: and each loop of the test gas supply mechanism is provided with a plurality of proportional pressure regulating valves.

6. The three-chamber pressure maintaining device of a fuel cell according to claim 5, characterized in that: and a plurality of pressure relief valves are arranged on each loop of the test gas supply mechanism.

7. The three-cavity pressure maintaining device of the fuel cell according to claim 6, wherein: and a plurality of flow meters are arranged on each loop of the test gas supply mechanism.

8. The three-chamber pressure maintaining device of a fuel cell according to claim 7, characterized in that: the test gas discharge mechanism comprises an exhaust valve SOV315, an exhaust valve SOV307, an exhaust valve SOV316 and an exhaust valve SOV308, and the exhaust valve SOV315, the exhaust valve SOV307, the exhaust valve SOV316 and the exhaust valve SOV308 are respectively arranged corresponding to a plurality of loops of the test gas supply mechanism.

9. The three-chamber pressure maintaining device of a fuel cell according to claim 8, characterized in that: the supply pressure of the test gas source is 20 MPa.

10. The three-chamber pressure maintaining device of a fuel cell according to claim 9, wherein: the test gas can be one of inert gases.