Device for measuring moisture absorption degree of proton exchange membrane

Abstract

The utility model relates to the technical field of proton exchange membrane fuel cells, and discloses a device for measuring the moisture absorption degree of a proton exchange membrane, which comprises a constant-temperature box body, a high-precision balance and a second box body, the second box body is a mechanism for placing an object to be measured on the high-precision balance, and a sealing structure is arranged at the edge of the second box body. The utility model mainly solves the technical problem of accurately measuring the relationship between the water content of the proton exchange membrane sulfonic group and the water content in the gas, provides a basis for the operation water management of a fuel cell, and provides a basis for the design and humidity control of hydrogen and air humidifying equipment.

Description

TECHNICAL FIELD

[0001] The utility model belongs to proton exchange membrane fuel cell technical field, especially relates to a device for measuring the moisture absorption degree of proton exchange membrane. BACKGROUND

[0002] It is a prerequisite for water management to understand the internal water concentration distribution law of proton exchange membrane fuel cell (PEMFC). Too much or too little water in the cell will cause the performance of the cell to decrease. When there is too much water, the phenomenon of "waterlogging" occurs, which submerges the porous electrode and hinders the occurrence of electrochemical reaction, and also causes the activity of catalyst to decrease, the electrochemical reaction rate in the cell to slow down, and thus the performance of the cell to decrease. When there is too little water, the proton exchange membrane is dried, which hinders the transfer of protons from the anode to the cathode and also decreases the performance of the cell. The more water the proton membrane absorbs, the better its conductivity is. Therefore, it is particularly important to determine the relationship between the moisture absorption performance of the proton membrane from the gas and the humidity of the gas. There is no special device in the prior art that can accurately determine the relationship between the water content of the sulfonic acid group of the proton exchange membrane and the water content in the gas, and thus cannot provide a basis for determining the humidification degree of the raw gas of the fuel cell, which will cause problems in the stable operation of the proton exchange membrane fuel cell. SUMMARY

[0003] In view of the deficiencies in the prior art, the utility model provides a device for measuring the moisture absorption degree of proton exchange membrane, which mainly solves the problem of accurately determining the relationship between the water content of the sulfonic acid group of the proton exchange membrane and the water content in the gas, and provides a basis for water management of fuel cell operation and design of hydrogen and air humidification equipment and humidity control.

[0004] To achieve the above purpose of determining the relationship between the water content of the sulfonic acid group of the proton exchange membrane and the water content in the gas, the utility model provides the following technical scheme:

[0005] A device for measuring the moisture absorption degree of proton exchange membrane, comprising a constant temperature box body and a high-precision balance, wherein the high-precision balance is arranged in the inner cavity of the constant temperature box body, and the device for measuring the moisture absorption degree of proton exchange membrane further comprises a second box body.

[0006] Further, the second box body comprises an electric opening and closing mechanism, a cavity and a cover, and the electric opening and closing mechanism is fixedly and sealingly connected with the cavity and the cover.

[0007] Further, the cavity and the cover are provided with a sealing structure at the opening and closing contact edge.

[0008] Further, the sealing structure comprises: a cover boss, which is arranged at the edge of the cover (10) in contact with the cavity,

[0009] The cover boss is provided with a flexible sealing block and an outer sealing clamping protrusion, the flexible sealing block is embedded in the cover boss, and the outer sealing clamping protrusion is located at the outer edge of the cover boss.

[0010] The sealing structure further comprises: a cavity boss, which is arranged at the edge of the cavity in contact with the cover,

[0011] The cavity boss is provided with a flexible sealing groove, the cavity boss is provided with a groove, the flexible sealing groove is embedded in the groove of the cavity boss, and the cavity boss is further provided with an inner sealing clamping protrusion, which is located at the inner edge of the cavity boss.

[0012] Further, the material of the flexible sealing block and the flexible sealing groove is: natural rubber or neoprene or EPDM or silicone rubber.

[0013] Further, the material of the flexible sealing block and the flexible sealing groove is: silicone rubber.

[0014] Further, the device for measuring the moisture absorption degree of the proton exchange membrane further comprises a balance platform, and the balance platform is arranged in the central inner cavity of the thermostat box body.

[0015] Further, the inner cavity of the thermostat box body further comprises a constant temperature water bath, which is located around the balance platform and at the bottom of the thermostat box body.

[0016] Further, the inner cavity of the thermostat box body further comprises a water-proof porous baffle, and the water-proof porous baffle covers the constant temperature water bath.

[0017] Further, the device for measuring the moisture absorption degree of the proton exchange membrane further comprises: an air inlet control valve, which is arranged on the thermostat box body.

[0018] Compared with the prior art, the device for measuring the moisture absorption degree of the proton exchange membrane has the following beneficial effects:

[0019] The high-precision determination of the relationship between the moisture absorption performance of the proton membrane from the gas and the gas humidity can provide support for clarifying the internal water concentration distribution rule of the proton exchange membrane fuel cell (PEMFC), on the one hand, and on the other hand, an additional humidifying device is arranged outside the stack during the operation of the proton membrane fuel cell, which is used for humidifying the gas, and then the gas is used to humidify the proton membrane, and the test results of the utility model can provide a basis for the design of the humidifying device and the humidity control. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 Figure 1 is a front view of the device for measuring the moisture absorption degree of a proton exchange membrane;

[0021] Figure 2 Figure 2 is a top view of the device for measuring the moisture absorption degree of a proton exchange membrane;

[0022] Figure 3 Figure 3 is a sectional view of the second box;

[0023] Figure 4 Figure 4 is a sealing structure diagram.

[0024] 1, constant temperature box, 2, high precision balance, 3, constant temperature water bath, 4, air inlet control valve, 5, second box, 6, balance platform, 7, anti-falling water porous baffle, 8, sealing structure, 81, cavity boss, 82, cover boss, 83, inner sealing clamping protrusion, 84, flexible sealing block, 85, outer sealing clamping protrusion, 86, flexible sealing groove, 87, flexible sealing strip, 9, electric opening and closing mechanism, 10, cover, 11, cavity. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0026] Please refer to Figures 1-2 The present application provides a technical solution:

[0027] Embodiment 1

[0028] The present embodiment is Figure 1 and Figure 2 As shown in the drawings, the device for measuring the moisture absorption degree of a proton exchange membrane comprises a constant temperature box 1 and a high precision balance 2, the high precision balance 2 is arranged in the inner cavity of the constant temperature box 1,

[0029] Further, the device for measuring the moisture absorption degree of a proton exchange membrane further comprises a balance platform 6, the balance platform 6 is arranged in the center of the inner cavity of the constant temperature box 1, and the high precision balance 2 is arranged on the balance platform 6.

[0030] Further, the inner cavity of the constant temperature box 1 further comprises a constant temperature water bath 3, the constant temperature water bath 3 is located around the balance platform 6 and at the bottom of the constant temperature box 1.

[0031] Furthermore, the device for measuring the moisture absorption of the proton exchange membrane also includes a waterproof porous baffle 7, which covers the constant temperature water bath 3.

[0032] Furthermore, the device for measuring the moisture absorption of the proton exchange membrane also includes an air intake control valve 4, which is disposed on the body of the constant temperature chamber 1.

[0033] During measurement, the proton exchange membrane to be tested is placed inside the second chamber 5, and its mass is recorded. Then, the temperature of the constant temperature chamber 1 and the constant temperature water bath 3 are controlled to the same temperature. When the humidity inside the chamber is stable, the second chamber 5 is opened. The proton exchange membrane will absorb moisture from the air, thus increasing its own weight. When the balance reading is stable, the mass of the proton exchange membrane is recorded a second time. The difference between the two masses is the degree of moisture absorption of the proton exchange membrane.

[0034] Example 2

[0035] This implementation example Figure 1 , Figure 2 and Figure 3 As shown, the device for measuring the moisture absorption of a proton exchange membrane includes: a constant temperature chamber 1, a balance platform 6, and an air intake control valve 4. The air intake control valve 4 is located on the body of the constant temperature chamber 1, and the balance platform 6 is located in the center of the inner cavity of the constant temperature chamber 1. The constant temperature chamber 1 also includes a high-precision balance 2 and a constant temperature water bath 3. The high-precision balance 2 is located on the balance platform 6, and the constant temperature water bath 3 is located around the balance platform 6. The constant temperature water bath 3 is equipped with a water droplet baffle 7. The mechanism for placing the object to be measured on the high-precision balance 2 is a second chamber 5.

[0036] The second housing includes an electric opening and closing mechanism 9, which is fixedly and sealed to the cavity 11 and the cover 10 respectively. When the electric opening and closing mechanism 9 rotates, it can realize the opening and closing of the cavity 11 and the cover 10.

[0037] Preferably, a sealing structure 8 is provided at the opening and closing contact edges of the cavity 11 and the cover 10.

[0038] During measurement, the proton exchange membrane to be tested is placed in the cavity 11 of the second chamber 5, and its mass is recorded. Then, the temperature of the constant temperature chamber 1 and the constant temperature water bath 3 are controlled to the same temperature. When the humidity inside the chamber is stable, the electric opening and closing mechanism 9 is opened. The electric opening and closing mechanism 9 rotates counterclockwise, thereby separating the opening and closing contact edge of the cavity 11 and the cover 10, and the second chamber 5 is opened. The proton exchange membrane will absorb moisture from the air, thus increasing its own weight. When the balance reading is stable, the mass of the proton exchange membrane is recorded a second time. The difference between the two masses is the degree of moisture absorption of the proton exchange membrane. The sealing structure 8 can prevent water vapor from entering the second chamber 5.

[0039] Example 3

[0040] The present embodiment is shown in Figure 1 、 Figure 2 、 Figure 3 and Figure 4 The structure is basically the same as that of Example 2, except that the sealing structure 8 of the second box body. The sealing structure 8 of the present embodiment is arranged at the opening and closing contact edge of the cavity 11 and the cover 10. The cover 10 is provided with a cover boss 82 at the contact edge. The cover boss 82 is embedded with a flexible sealing block 84. The outer edge of the cover boss 82 is provided with an outer sealing clamping protrusion 85. The cavity 11 is provided with a cavity boss 81 at the outer edge of the contact edge. The cavity boss 81 is provided with a recess. The recess is embedded with a flexible sealing groove 86. The inner edge of the cavity boss 81 is provided with an inner sealing clamping protrusion 83.

[0041] During measurement, the steps are the same as those of Example 2. When the electric opening and closing mechanism 9 is closed, the flexible sealing block 84 is clamped into the cavity of the flexible sealing groove 86. The outer sealing clamping protrusion 85 is attached to the outer edge of the cavity boss 81. The inner sealing clamping protrusion 83 is attached to the inner edge of the cover boss 82. Thus, the sealing effect is achieved.

[0042] It should be noted that in this document, the terms "comprising", "including", or any other variant thereof are intended to cover non-exclusive inclusions, so that processes, methods, articles, or devices that include a series of elements not only include those elements, but also include other elements not explicitly listed, or inherent to such processes, methods, articles, or devices. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of other identical elements in the process, method, article, or device that includes the element.

[0043] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made thereto without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An apparatus for measuring the degree of moisture absorption of a proton exchange membrane, characterized by: Including thermostat body (1) and high-precision balance (2), high-precision balance (2) is arranged in the inner chamber of thermostat body (1), the device for measuring the moisture absorption degree of proton exchange membrane further includes: second box (5).

2. The device for measuring the degree of moisture absorption of a proton exchange membrane according to claim 1, wherein The second box (5) includes an electric opening and closing mechanism (9), a cavity (11) and a cover (10), and the electric opening and closing mechanism (9) is fixedly and sealingly connected with the cavity (11) and the cover (10) respectively.

3. The device for measuring the degree of moisture absorption of a proton exchange membrane according to claim 2, characterized by: The opening and closing contact edges of the cavity (11) and the cover (10) are provided with a sealing structure (8).

4. The apparatus for measuring the moisture absorption of a proton exchange membrane according to claim 3, wherein: The sealing structure (8) includes a cover boss (82), which is arranged at the edge of the cover (10) contacting the cavity (11), The cover boss (82) is provided with a flexible sealing lug (84) and an outer sealing clamping protrusion (85), the flexible sealing lug (84) is embedded in the cover boss (82), and the outer sealing clamping protrusion (85) is located at the outer edge of the cover boss (82); The sealing structure (8) further includes a cavity boss (81), which is arranged at the edge of the cavity (11) contacting the cover (10), The cavity boss (81) is provided with a flexible sealing groove (86), the cavity boss (81) is provided with a groove, the flexible sealing groove (86) is embedded in the groove of the cavity boss, and the cavity boss (81) is further provided with an inner sealing clamping protrusion (83), which is located at the inner edge of the cavity boss (81).

5. The apparatus for measuring the moisture absorption of a proton exchange membrane according to claim 4, wherein: The materials of the flexible sealing lug (84) and the flexible sealing groove (86) are natural rubber or neoprene rubber or ethylene-propylene-diene rubber or silicone rubber.

6. The apparatus for measuring the moisture absorption of a proton exchange membrane according to claim 5, wherein: The materials of the flexible sealing lug (84) and the flexible sealing groove (86) are silicone rubber.

7. The device for measuring the degree of moisture absorption of a proton exchange membrane according to claim 1, characterized by: The device for measuring the moisture absorption degree of proton exchange membrane further includes a balance platform (6), which is arranged in the central inner chamber of the thermostat body (1), and the high-precision balance (2) is arranged on the balance platform (6).

8. The device for measuring the degree of moisture absorption of a proton exchange membrane according to claim 7, characterized by: The inner chamber of the thermostat body (1) further includes a constant temperature water bath (3), which is located around the balance platform (6) and at the bottom of the thermostat body (1).

9. The apparatus for measuring the moisture uptake of a proton exchange membrane according to claim 8, wherein: The inner chamber of the thermostat body (1) further includes a water-proof porous baffle (7), which covers the constant temperature water bath (3).

10. The apparatus for measuring the moisture uptake of a proton exchange membrane according to any one of claims 1 to 9, wherein: The device further includes an air inlet control valve (4), which is arranged on the body of the thermostat body (1).

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