CN113804375B

CN113804375B - Fuel cell air tightness detection device and detection method

Info

Publication number: CN113804375B
Application number: CN202111082789.6A
Authority: CN
Inventors: 魏刚; 陆维; 耿珺; 胡皓然; 刘希
Original assignee: Spic Hydrogen Energy Technology Development Co Ltd
Current assignee: Spic Hydrogen Energy Technology Development Co Ltd
Priority date: 2021-09-15
Filing date: 2021-09-15
Publication date: 2024-02-13
Anticipated expiration: 2041-09-15
Also published as: CN113804375A

Abstract

The invention discloses a fuel cell air tightness detection device and a detection method, wherein the fuel cell air tightness detection device comprises: the first clamp plate, second clamp plate, first location subassembly and the first location subassembly of ventilating ventilate. The first pressing plate is provided with a first through hole and a second through hole, and the second pressing plate is provided with a first blind hole and a second blind hole; the first ventilation positioning assembly and the second ventilation positioning assembly are respectively connected with the first through hole and the second through hole, and can be respectively inserted into the first blind hole and the second blind hole; during detection, the first pressing plate and the second pressing plate carry out positioning clamping on the single cell through the first ventilation positioning assembly and the first ventilation positioning assembly, constant-pressure gas is input into the inner cavity of the single cell through an external gas source, and therefore the airtight condition of the single cell is observed. The fuel cell air tightness detection device has the advantages of convenience in installation, accuracy in air tightness detection and the like.

Description

Fuel cell air tightness detection device and detection method

Technical Field

The invention relates to the technical field of fuel cells, in particular to a fuel cell air tightness detection device and a detection method.

Background

A fuel cell is an electrochemical device that converts chemical energy into electrical energy through an electrochemical reaction. When the battery works, hydrogen and air respectively serve as fuel gas and oxidant gas to reach the anode and the cathode of the battery through the gas flow channels on the bipolar plate, water is generated by reaction under the action of the catalyst, and the process is accompanied with electron migration so as to generate current. Air cooling is performed using air, which is supplied to the fuel cell by a cooling fan, and which serves as both a coolant and a cathode gas. Since the reaction raw material is gas, the air-cooled fuel cell needs to have good air tightness and cannot leak air. Poor air tightness results in air leakage, which not only affects the energy utilization efficiency of the fuel cell, but also has certain potential safety hazards. Therefore, the tightness of the battery needs to be checked before the battery is put into use to ensure that the gas channels of hydrogen and air form a closed cycle in the galvanic pile.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems in the related art to some extent.

Therefore, the embodiment of the invention provides the fuel cell air tightness detection device which has the advantages of convenience in installation and accuracy in air tightness detection.

The embodiment of the invention also provides a fuel cell air tightness detection method which has the advantages of convenience in installation and accuracy in air tightness detection.

The fuel cell air tightness detection device according to the embodiment of the invention comprises:

the fuel cell comprises a first pressing plate and a second pressing plate, wherein the first pressing plate and the second pressing plate are oppositely arranged in a first direction, a single cell of the fuel cell can be located between the first pressing plate and the second pressing plate in the first direction, the first pressing plate comprises a first through hole and a second through hole which are arranged at intervals in a second direction, the second pressing plate comprises a first blind hole and a second blind hole which are arranged at intervals in the second direction, the first through hole and the first blind hole can correspond in the first direction, the second through hole and the second blind hole can correspond in the first direction, and the first direction is perpendicular to the second direction; and

the first ventilation positioning assembly can be matched with each of the first through hole and the first blind hole so as to position the first pressing plate and the second pressing plate, the first ventilation positioning assembly is suitable for being connected with a gas source so as to enable gas to be introduced into the inner cavity of the single cell, and the second ventilation positioning assembly can be matched with each of the second through hole and the second blind hole so as to position the first pressing plate and the second pressing plate, and the second ventilation positioning assembly is suitable for being connected with the gas source so as to enable gas to be introduced into the inner cavity of the single cell.

According to the fuel cell air tightness detection device provided by the embodiment of the invention, the first ventilation positioning component and the second ventilation positioning component can be used for positioning, and gas can be introduced into the inner cavity of the single cell, so that the clamping mode and the air inlet mode of the single cell during air tightness detection are consistent with the assembly air inlet relation of the single cell during actual operation, the air tightness detection of the device is more in accordance with the actual working condition, and the obtained detection result is more representative and accurate.

In addition, the first ventilation positioning assembly and the second ventilation positioning assembly of the fuel cell air tightness detection device have the functions of positioning and ventilation at the same time, and the air inlet device is not required to be installed after the single cells are positioned and clamped.

Therefore, the fuel cell air tightness detection device provided by the embodiment of the invention has the advantages of convenience in installation and accuracy in air tightness detection.

In some embodiments, the first vent positioning assembly includes a first positioning member and a first vent member, the first vent member is mated with the first through hole, the first positioning member is mated with each of the first through hole and the first blind hole, the first positioning member has a first vent cavity, the first vent hole is capable of communicating with the first vent cavity and the internal cavity of the single cell, the second vent positioning assembly includes a second positioning member and a second vent member, the second vent member is mated with the second vent hole, the second positioning member is capable of mated with each of the second through hole and the second blind hole, the second positioning member has a second vent hole, the second vent hole is capable of communicating with the second vent cavity and the internal cavity of the single cell.

In some embodiments, the first retainer includes a first end and a second end, the first end of the first retainer is disposed within the first through hole, the second end of the first retainer is capable of being disposed within the first blind hole, the first vent includes a first end and a second end, the first end of the first vent extends through an end face of the first end of the first retainer, the second end of the first vent extends through at least one of an end face of the second end of the first retainer and an outer peripheral surface of the first retainer,

the first venting member including a third end and a fourth end, the third end of the first venting member being disposed within the first through-hole, the fourth end of the first venting member being adapted to be connected to the air source, the first venting chamber including a third end and a fourth end, the third end of the first venting chamber extending through an end face of the third end of the first venting member so as to be in communication with the first venting hole, the fourth end of the first venting chamber extending through an end face of the fourth end of the first venting member so as to be connected to the air source,

The second positioning piece comprises a fifth end and a sixth end, the fifth end of the second positioning piece is arranged in the second through hole, the fifth end of the second positioning piece can be arranged in the second blind hole, the second ventilation hole comprises a fifth end and a sixth end, the fifth end of the second ventilation hole penetrates through the end face of the fifth end of the second positioning piece, the sixth end of the second ventilation hole penetrates through at least one of the end face of the sixth end of the second positioning piece and the outer peripheral face of the second positioning piece,

the second ventilation member includes a seventh end and an eighth end, the seventh end of the second ventilation member is disposed in the second through hole, the eighth end of the second ventilation member is adapted to be connected to a gas source, the second ventilation chamber includes a seventh end and an eighth end, the seventh end of the second ventilation chamber penetrates through an end face of the seventh end of the second ventilation member so as to be in communication with the second ventilation hole, and the eighth end of the second ventilation chamber penetrates through an end face of the eighth end of the second ventilation member so as to be connected to the gas source.

In some embodiments, the fuel cell tightness detection device of the embodiment of the present invention further includes a first sealing assembly that can be provided between the first pressure plate and the unit cell to avoid leakage of gas from between the first pressure plate and the unit cell, and a second sealing assembly that can be provided between the second pressure plate and the unit cell to avoid leakage of gas from between the second pressure plate and the unit cell.

In some embodiments, the first platen includes a first surface adjacent to the second platen in the first direction, the second platen includes a second surface adjacent to the first platen in the first direction,

one side of the first sealing component in the first direction is abutted against the first surface of the first pressing plate, the other side of the first sealing component in the first direction is suitable for being abutted against the third surface of the single cell,

one side of the second sealing component in the first direction abuts against the second surface of the second pressing plate, and the other side of the second sealing component in the first direction is suitable for abutting against the fourth surface 32 of the single cell.

In some embodiments, the first sealing assembly comprises a first sealing ring and a second sealing ring, the first sealing ring can be sleeved on the first positioning piece, and the second sealing ring can be sleeved on the second positioning piece;

the second sealing assembly comprises a third sealing ring and a fourth sealing ring, the third sealing ring can be sleeved on the first positioning piece, and the fourth sealing ring can be sleeved on the second positioning piece.

In some embodiments, the first blind hole includes a first section and a second section communicating in the first direction, one end of the first section penetrating the second surface, the other end of the first section communicating with the second section, the first blind hole including a first circumferential surface, a second circumferential surface, and a first stepped surface, the circumferential wall of the first section forming the first circumferential surface, the circumferential wall of the second section forming the second circumferential surface, the first stepped surface being connected between the first circumferential surface and the second circumferential surface, the first circumferential surface having a radial dimension greater than a radial dimension of the second circumferential surface, the first stepped surface intersecting each of the first circumferential surface and the second circumferential surface;

the second blind hole comprises a third section and a fourth section which are communicated in the first direction, one end of the third section penetrates through the second surface, the other end of the third section is communicated with the fourth section, the second blind hole comprises a third peripheral surface, a fourth peripheral surface and a second step surface, the peripheral wall surface of the third section forms the third peripheral surface, the peripheral wall surface of the fourth section forms the fourth peripheral surface, the second step surface is connected between the third peripheral surface and the fourth peripheral surface, the radial size of the third peripheral surface is larger than the radial size of the fourth peripheral surface, and the second step surface is intersected with each of the third peripheral surface and the fourth peripheral surface.

In some embodiments, at least a portion of the third seal ring is located within the first segment, a side of the third seal ring adjacent the second segment being capable of abutting the first step surface of the first blind bore;

at least part of the fourth sealing ring is positioned in the third section, and one side of the fourth sealing ring adjacent to the fourth section can be abutted against the second step surface of the second blind hole.

In some embodiments, the first through hole includes a fifth section and a sixth section, one end of the fifth section penetrates the second surface, the other end of the fifth section communicates with the sixth section, the first through hole includes a fifth circumferential surface, a sixth circumferential surface, and a third step surface, a circumferential wall surface of the fifth section forms the fifth circumferential surface, a circumferential wall surface of the sixth section forms the sixth circumferential surface, the third step surface is connected between the fifth circumferential surface and the sixth circumferential surface, a radial dimension of the fifth circumferential surface is larger than a radial dimension of the sixth circumferential surface, and the third step surface intersects each of the fifth circumferential surface and the sixth circumferential surface;

the second through hole comprises an eighth section and a ninth section, one end of the eighth section penetrates through the second surface, the other end of the eighth section is communicated with the ninth section, the second through hole comprises a seventh circumferential surface, an eighth circumferential surface and a fourth step surface, the circumferential wall surface of the eighth section forms the seventh circumferential surface, the fourth step surface is connected between the seventh circumferential surface and the eighth circumferential surface, the radial size of the seventh circumferential surface is larger than the radial size of the eighth circumferential surface, and the fourth step surface intersects with each of the seventh circumferential surface and the eighth circumferential surface.

In some embodiments, at least a portion of the first seal ring is located within the fifth segment, a side of the first seal ring adjacent to the sixth segment being capable of abutting the third step surface of the first through hole;

at least part of the second sealing ring is positioned in the eighth section, and one side of the second sealing ring adjacent to the ninth section can be abutted against the fourth step surface of the second through hole.

In some embodiments, the first through hole further comprises a seventh section, the sixth section being located between the fifth section and the seventh section, a portion of the first detent cooperating with the sixth section of the first through hole;

the second through hole further comprises a tenth section, the ninth section is located between the eighth section and the tenth section, and a part of the second positioning piece is matched with the ninth section of the second through hole;

the third end of the first vent is in sealing engagement with the seventh section of the first through-hole; the seventh end of the second vent is in sealing engagement with the tenth section of the second through bore.

In some embodiments, the first through hole has a first connection section, at least a portion of the sixth section of the first through hole forming the first connection section;

The first positioning piece comprises a first connecting part and a first positioning part, the first connecting part can be matched with the first connecting section so that the first positioning piece can be fixedly connected in the first through hole, and at least part of the first positioning part can extend into the first blind hole;

the second through hole is provided with a second connecting section, and the ninth section of the first through hole forms the second connecting section;

the second locating piece includes second connecting portion and second locating part, second connecting portion can with the cooperation of second linkage segment, so that second locating piece can fixed connection be in the second through-hole, at least part of second locating part can stretch into in the second blind hole.

The fuel cell air tightness detection method according to the embodiment of the invention comprises the fuel cell air tightness detection device according to any of the above embodiments, and comprises the following steps:

disposing a cell between the first platen and the second platen;

compressing the first and second platens;

introducing constant-pressure gas into the inner cavity of the single cell by utilizing the gas source to enable the pressure in the inner cavity of the single cell to reach P;

And after the time t, detecting the pressure in the inner cavity of the single cell, and judging whether the single cell leaks.

The fuel cell air tightness detection method according to the embodiment of the invention can detect whether the single cell leaks air or not through the change of the air pressure in the single cell. The method can detect the tiny air pressure change in the inner cavity of the single cell caused by air leakage, so that the detection result of the method is more accurate. And only after the single cell is clamped on the fuel cell air tightness detection device, the air source, the detection instrument and the fuel cell air tightness detection device are connected, so that the air tightness of the single cell can be detected. Therefore, the detection mode of the method is simple.

Therefore, the fuel cell air tightness detection method provided by the embodiment of the invention has the advantages of high detection precision, simple detection mode and the like.

In some embodiments, the detecting the pressure in the internal cavity of the cell, and determining whether the cell is leaking comprises:

if the pressure in the inner cavity of the single cell is reduced, the single cell leaks;

if the pressure in the inner cavity of the single cell is unchanged, the single cell is airtight.

Drawings

Fig. 1 is a schematic structural view of a fuel cell air tightness detection device according to an embodiment of the present invention;

Fig. 2 is a sectional view of a battery air-tightness detecting device according to an embodiment of the present invention;

fig. 3 is an assembly relationship diagram of a fuel cell air tightness detection device according to an embodiment of the present invention;

FIG. 4 is a schematic structural view of a second platen according to an embodiment of the present invention;

FIG. 5 is a schematic view of a first platen according to an embodiment of the present invention;

FIG. 6 is a schematic structural view of a first vent positioning assembly and a second vent positioning assembly according to an embodiment of the invention;

fig. 7 is a schematic view of an apparatus structure of a fuel cell air tightness detection method according to an embodiment of the present invention.

Fig. 8 is a schematic structural view of a single cell according to an embodiment of the present invention;

FIG. 9 is a cross-sectional view taken along A-A of FIG. 8;

reference numerals:

a first platen 1; a first surface 13; a first through hole 11; a fifth section 111; a sixth section 112; a seventh section 113; a fifth peripheral surface 114; a sixth peripheral surface 116; a third step surface 115; a first connecting section 117; a second through hole 12; an eighth section 121; a ninth section 122; tenth section 123; a seventh peripheral surface 124; an eighth peripheral surface 126; a fourth step surface 125; a second connecting section 127;

a second platen 2; a second surface 23; a first blind hole 21; a first section 212; a second section 211; a first perimeter 215; a second peripheral surface 213; a first step surface 214; a second blind hole 22; a third section 222; a fourth section 221; a third peripheral surface 225; a fourth peripheral surface 223; a second step surface 224;

A single cell 3; a third surface 31; a fourth surface 32;

a first vent positioning assembly 4; a first positioning member 42; a second end 421; a first end 422; a first ventilation hole 423; a first end 4232; a second end 4231; a first connection portion 424; a first positioning portion 425; a first breather 41; a third end 412; a fourth end 411; a first venting chamber 413; a third end 4132; a fourth end 4131;

a second venting positioning assembly 5; a second positioning member 52; a fifth end 522; a sixth end 521; a second ventilation hole 523; a second connection portion 524; a second positioning portion 525; a fifth end 5232; a sixth end 5231; a second vent 51; a seventh end 512; eighth end 511; a second vent chamber 513; a seventh end 5132; an eighth end 5131;

a second gap layer 6;

a first seal assembly 7; a first seal ring 71; a second seal ring 72;

a second seal assembly 8; a third seal ring 81; a fourth seal ring 82;

a second gap layer 9;

a gas source s1; a first outlet s11; an airtight detector s2; a first inlet s21; a second outlet s22; a second inlet s4; and a third inlet s5.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.

A fuel cell air tightness detection device according to an embodiment of the present invention is described below with reference to the drawings.

As shown in fig. 1 to 9, a fuel cell air tightness detection device according to an embodiment of the present invention includes: a first platen 1, a second platen 2, a first vent positioning assembly 4, and a second vent positioning assembly 5.

As shown in fig. 1 and 2, the first platen 1 and the second platen 2 are disposed opposite to each other in the first direction. Specifically, the first platen 1 and the second platen 2 are disposed opposite to each other in a first direction (up-down direction as shown in fig. 1), with the first platen 1 being below and the second platen 2 being above the first platen 1.

The first platen 1 includes first through holes 11 and second through holes 12 arranged at intervals in a second direction (left-right direction in fig. 2). Specifically, the first through hole 11 and the second through hole 12 are opened on the first platen 1, and the first through hole 11 and the second through hole 12 are spaced apart by a certain distance, wherein the axial direction of the first through hole 11 and the second through hole 12 is a first direction (up-down direction as shown in fig. 2).

The second platen 2 includes first blind holes 21 and second blind holes 22 arranged at intervals in the second direction. Specifically, as shown in fig. 2, the first blind hole 21 and the second blind hole 22 are formed on the second platen 2, and the first blind hole 21 and the second blind hole 22 are spaced apart from each other by a certain distance, wherein the axial direction of the first blind hole 21 and the second blind hole 22 is the up-down direction.

The first through hole 11 and the first blind hole 21 can correspond in a first direction, and the second through hole 12 and the second blind hole 22 can correspond in a first direction, the first direction being perpendicular to the second direction.

Specifically, as shown in fig. 2, the first through hole 11 of the first platen 1 and the first blind hole 21 of the second platen 2 correspond up and down, the second through hole 12 of the first platen 1 and the second blind hole 22 of the second platen 2 correspond up and down, and the distance between the first through hole 11 and the second through hole 12 on the first platen 1 is equal to the distance between the first blind hole 21 and the second blind hole 22 on the second platen 2, so that the first through hole 11 and the first blind hole 21 and the second through hole 12 and the second blind hole 22 can correspond up and down at the same time.

As shown in fig. 2-6, the first venting positioning assembly 5 includes a first venting member 41 and a first positioning member 42.

The first positioning member 42 includes a first end 422 (e.g., a lower end of the first positioning member 43 in fig. 1) and a second end 421 (e.g., an upper end of the first positioning member 43 in fig. 1), the first end 422 of the first positioning member 42 is disposed in the first through hole 11, and the second end 421 of the first positioning member 42 can be disposed in the first blind hole 21.

As shown in fig. 2, specifically, the lower end of the first positioning member 42 is connected in the first through hole 11, and the upper end of the first positioning member 42 is located outside the first through hole 11 of the first pressing plate 1, so that the upper end of the first positioning member 42 can be inserted into the first blind hole 21 of the second pressing plate 2, thereby being capable of positioning the first pressing plate 1, the second pressing plate 2, and the unit cell 3.

The first positioning member 42 has a first ventilation hole 423, and the first ventilation hole 423 includes a first end portion 4232 and a second end portion 4231. The first end portion 4232 of the first ventilation hole 423 penetrates an end surface of the first end 422 of the first positioning member 42, and the second end portion 4231 of the first ventilation hole 423 penetrates at least one of an end surface of the second end 421 of the first positioning member 42 and an outer peripheral surface of the first positioning member 42.

Specifically, the first end 4232 of the first air hole 423 penetrates the lower end surface of the first positioning member 42, and the first end 4232 of the first air hole 423 penetrates the upper end surface of the first positioning member 42; alternatively, the first end portion 4232 of the first ventilation hole 423 penetrates the lower end surface of the first positioning member 42, and the first end portion 4232 of the first ventilation hole 423 penetrates the outer circumferential surface of the first positioning member 42; alternatively, the first end portion 4232 of the first ventilation hole 423 penetrates the lower end surface of the first positioning member 42, and the first end portion 4232 of the first ventilation hole 423 penetrates the upper end surface and the outer peripheral surface of the first positioning member 42. Accordingly, the gas in the first through hole 11 can be discharged through the first ventilation hole 423 of the first positioning member 42.

The first venting member 41 includes a third end 412 (e.g., the upper end of the first venting member 41 in fig. 1) and a fourth end 411 (e.g., the lower end of the first venting member 41 in fig. 1), the third end 412 of the first venting member 41 being disposed within the first through-hole 11, the fourth end 411 of the first venting member 41 being adapted for connection to a gas source. The first ventilation member 41 has a first ventilation chamber 413, the first ventilation chamber 413 includes a third end 4132 and a fourth end 4131, the third end 4132 of the first ventilation chamber 413 is opened at an end face of the third end 412 of the first ventilation member 41, so the first ventilation chamber 413 can communicate with the first ventilation hole 423, the fourth end 4131 of the first ventilation chamber 413 is opened at an end face of the fourth end 411 of the first ventilation member 41, so the first ventilation chamber 413 can be connected to the gas source s1, so the gas source s1 can be introduced into the first through hole 11 through the first ventilation chamber 413 of the first ventilation member 41.

As shown in fig. 2-6, the second venting positioning assembly 5 includes a second positioning member 52 and a second venting member 51.

The second positioning member 52 includes a fifth end 522 (e.g., the lower end of the second positioning member 52 in fig. 1) and a sixth end 521 (e.g., the upper end of the second positioning member 52 in fig. 1), the fifth end 522 of the second positioning member 52 being disposed within the second through-hole 12, the fifth end 522 of the second positioning member 52 being capable of being disposed within the second blind hole 22.

As shown in fig. 2, specifically, the lower end of the second positioning member 52 is connected in the second through hole 21, and the upper end of the second positioning member 52 is located outside the second through hole 21 of the second pressing plate 2, so that the upper end of the second positioning member 52 can be inserted into the second blind hole 22 of the second pressing plate 2, thereby being capable of positioning the first pressing plate 1, the second pressing plate 2, and the unit cell 3.

The second positioning member 52 has a second ventilation hole 523, the second ventilation hole 523 includes a fifth end portion 5232 and a sixth end portion 5231, the fifth end portion 5232 of the second ventilation hole 523 penetrates an end face of the fifth end 522 of the second positioning member 52, and the sixth end portion 5231 of the second ventilation hole 523 penetrates at least one of an end face of the sixth end 521 of the second positioning member 52 and an outer peripheral face of the second positioning member 52.

The fifth end 5232 of the second vent hole 523 penetrates the lower end surface of the second positioning member 52, and the sixth end 5231 of the second vent hole 523 penetrates the upper end surface of the second positioning member 52; alternatively, the fifth end portion 5232 of the second ventilation hole 523 penetrates the lower end surface of the second positioning piece 52, and the sixth end portion 5231 of the second ventilation hole 523 penetrates the outer circumferential surface of the second positioning piece 52; the fifth end portion 5232 of the second positioning member 52 penetrates the lower end surface of the second positioning member 52, and the fifth end portion 5232 of the second ventilation hole 523 penetrates the upper end surface and the outer peripheral surface of the second positioning member 52. Accordingly, the gas in the second through hole 12 can be discharged through the second through hole 523 of the second positioning member 52.

As shown in fig. 2, the second venting member 51 includes a seventh end 512 (e.g., the upper end of the second venting member 51 in fig. 1) and an eighth end 511 (the second venting member 51). The seventh end 512 of the second venting member 51 is disposed in the second through-hole 12, the eighth end 511 of the second venting member 51 is adapted to be connected to the air source s1, the second venting member 51 has a second venting chamber 513, the second venting chamber 513 includes a seventh end 5132 and an eighth end 5131, the seventh end 5132 of the second venting chamber 513 is disposed at an end face of the seventh end 512 of the second venting member 51, and thus the second venting chamber 513 is capable of communicating with the second venting hole 523. The eighth end 5131 of the second venting chamber 513 is open at the end face of the eighth end 511 of the second venting member 51 such that the second venting chamber 513 can be connected to the gas source s1 such that the gas source s1 can vent gas into the first through-hole through the second venting chamber 513 of the second venting member 51.

As shown in fig. 8 and 9, two through holes arranged at intervals in the left-right direction are formed on the surface of the single cell 3 (the surface corresponding to the up-down direction shown in fig. 9) in the embodiment of the present invention. It can be understood that, the spacing distance between the two through holes on the single cell 3 is the same as the spacing distance between the first through hole 11 and the second through hole 12, the spacing distance between the first blind hole 21 and the second blind hole 22, and the spacing distance between the first ventilation positioning component 4 and the second ventilation positioning component 5, so that the first positioning piece 42 and the second positioning piece 52 can be inserted into the two through holes of the single cell 3, and thus the single cell 3 can be positioned and arranged on the first pressing plate 1 through the first positioning piece 42 and the second positioning piece 52. The peripheral wall surfaces of the two through holes of the single cell 3 are provided with air inlets, so that external air can enter the inner cavity of the single cell 3 through the air inlets on the peripheral wall surfaces of the two through holes.

According to the fuel cell air tightness detection device provided by the embodiment of the invention, the first locating piece and the first ventilation piece are arranged in the first through hole, the second locating piece and the second ventilation piece are arranged in the second through hole, that is, the locating part and the air inlet part are arranged in the same through hole, and the locating part and the air inlet part are further integrated, so that the clamping mode and the air inlet mode of a single cell during air tightness detection are consistent with the air inlet relation of the single cell during actual operation, therefore, the air tightness detection of the device is more in accordance with the actual working condition, and the obtained detection result is more representative and accurate.

In addition, according to the fuel cell air tightness detection device disclosed by the embodiment of the invention, due to the design that the positioning component and the air inlet and ventilation component are integrated, the first ventilation positioning component and the second ventilation positioning component have the positioning and ventilation functions at the same time, and the air inlet device is not required to be installed after the single cells are positioned and clamped.

In some embodiments, as shown in fig. 3 to 6, the fuel cell tightness detection device of the embodiment of the present invention further includes a first seal assembly 7 and a second seal assembly 8.

The first sealing assembly 7 can be disposed between the first pressure plate 1 and the cell 3 to avoid leakage of gas from between the first pressure plate 1 and the cell 3, and the second sealing assembly 8 can be disposed between the second pressure plate 2 and the cell 3 to avoid leakage of gas from between the second pressure plate 2 and the cell 3.

It will be appreciated that, as shown in fig. 3, a first gap 9 is formed between the first pressing plate 1 and the unit cell 3, and a second gap 6 is formed between the second pressing plate 2 and the unit cell 3. The first seal assembly 7 is disposed in the first gap 9, and the second seal assembly 8 is disposed in the second gap 6, so that the first seal assembly 7 and the second seal assembly 8 form a closed cavity with the first gap and the second gap 6, and leakage of the gas discharged from the first positioning member 42 and the second positioning member 52 from the first gap 9 and the second gap 6 can be avoided, so that the gas cannot be input into the cavity of the single cell 3.

The fuel cell air tightness detection device provided by the embodiment of the invention is provided with the sealable component for preventing gas leakage, so that the gas leakage conveyed into the inner cavity of the single cell 3 through the ventilation positioning component can be avoided, and the inaccurate air tightness detection result is caused.

Therefore, the fuel cell air tightness detection device provided by the embodiment of the invention has the advantage of good air tightness.

In some embodiments, the first platen 1 includes a first surface 13 (an upper surface of the first platen 1 as shown in fig. 2) adjacent to the second platen 2 in a first direction, and the second platen 2 includes a second surface 23 (a lower surface of the second platen 2 as shown in fig. 2) adjacent to the first platen 1 in the first direction.

As shown in fig. 3, one side of the first sealing assembly 7 in the first direction (the side of the first sealing assembly 7 below as shown in fig. 3) abuts against the first surface 13 of the first pressing plate 1, and the other side of the first sealing assembly 7 in the first direction (the side of the first sealing assembly 7 above as shown in fig. 3) is adapted to abut against the third surface 31 of the unit cell 3. Therefore, the first seal assembly 7 can prevent the gas discharged from the first positioning member 42 and the second positioning member 52 from leaking out of the first gap 9, thereby ensuring the air tightness of the fuel cell air tightness detection device.

Further, as shown in fig. 3, the first sealing assembly 7 includes a first sealing ring 71 and a second sealing ring 72, the first sealing ring 71 can be sleeved on the first positioning member 42, and the second sealing ring 72 can be sleeved on the second positioning member 52.

Specifically, the first sealing ring 71 is sleeved on the first positioning member 42, the lower surface of the first sealing ring 71 abuts against the upper surface of the first pressing plate 1, and the upper surface of the first sealing ring 71 abuts against the upper surface of the single cell 3; the second sealing ring 72 is sleeved on the second positioning member 52, the lower surface of the second sealing ring 72 abuts against the upper surface of the first pressing plate 1, and the upper surface of the second sealing ring 72 abuts against the fourth surface 32 of the single cell 3 (the upper surface of the single cell is shown in fig. 3).

As shown in fig. 3, one side of the second sealing member 8 in the first direction (the side above the second sealing member 8 as shown in fig. 3) abuts against the second surface 23 of the second pressing plate 2, and the other side of the second sealing member 8 in the first direction (the side below the second sealing member 8 as shown in fig. 3) is adapted to abut against the fourth surface 32 of the unit cell 3. Therefore, the second seal assembly 8 can prevent the gas discharged from the first positioning member 42 and the second positioning member 52 from leaking out of the second gap 6, thereby ensuring the air tightness of the fuel cell air tightness detection device.

Further, as shown in fig. 3, the second sealing assembly 8 includes a third sealing ring 81 and a fourth sealing ring 82, the third sealing ring 81 can be sleeved on the first positioning member 42, and the fourth sealing ring 82 can be sleeved on the second positioning member 52.

Specifically, the second sealing ring 72 is sleeved on the second positioning member 52, the lower surface of the second sealing ring 72 abuts against the upper surface of the first pressing plate 1, and the upper surface of the second sealing ring 72 abuts against the upper surface of the single cell 3. The third sealing ring 81 is sleeved on the first positioning piece 42, the upper surface of the first sealing ring 71 is propped against the second surface 23 of the second pressing plate 2, and the lower surface of the third sealing ring 81 is propped against the fourth surface 32 of the single cell 3; the fourth sealing ring 82 is sleeved on the second positioning piece 52, the upper surface of the fourth sealing ring 82 abuts against the lower surface of the second pressing plate 2, and the lower surface of the fourth sealing ring 82 abuts against the upper surface of the single cell 3.

It will be appreciated that, as shown in fig. 3, the inner peripheral surface of the first seal ring 71, the inner peripheral surface of the third seal ring 81, and the peripheral wall surface of one through hole of the unit cell 3 may form a first closed cavity, and a portion of the first positioning member 42 is located in the first closed cavity, and a third gap is provided between the outer peripheral surface of the first positioning member 42 and the peripheral wall surface of the first closed cavity, so that the gas discharged from the first ventilation hole 423 of the first positioning member 42 may enter the gas inlet hole of the one through hole of the unit cell 3 from the third gap, and further enter the inner cavity of the unit cell 3.

Further, due to the blocking of the first seal ring 71 and the third seal ring 81, gas cannot leak out from the first gap 9 of the first pressure plate 1 and the cell 3 and the second gap 6 of the second pressure plate 2 and the cell 3.

As shown in fig. 3, the inner peripheral surface of the second seal ring 72, the inner peripheral surface of the fourth seal ring 82, and the peripheral wall surface of the other through hole of the unit cell 3 may form a second closed cavity, and a portion of the second positioning member 52 is located in the first closed cavity, and a fourth gap is provided between the outer peripheral surface of the first positioning member and the peripheral wall surface of the first closed cavity, so that the gas discharged from the second ventilation hole 523 of the second positioning member 52 may enter the gas inlet hole of the one through hole of the unit cell 3 from the fourth gap, and further enter the inner cavity of the unit cell 3.

Further, due to the blocking of the second seal ring 72 and the fourth seal ring 82, gas cannot leak out from the first gap 9 of the first pressing plate 1 and the unit cell 3 and the second gap 6 of the second pressing plate 2 and the unit cell 3.

Alternatively, the first seal member 7 and the second seal member 8 may be made of rubber, and when the dimensions of the first gap 9 and the second gap 6 in the first direction become smaller, the seal members made of rubber will elastically deform and contact the surface more closely, so that the air tightness of the device is better.

As shown in fig. 4, in some embodiments, the first blind bore 21 includes a first section 212 and a second section 211 that communicate in a first direction.

One end of the first section 212 (e.g., a lower end of the first section 212 in fig. 1) penetrates the second surface 23, the other end of the first section 212 (e.g., an upper end of the first section 212 in fig. 1) communicates with the second section 211, the first blind hole 21 includes a first circumferential surface 215, a second circumferential surface 213, and a first stepped surface 214, the circumferential surface of the first section 212 forms the circumferential surface 215, the circumferential wall of the second section 211 forms the second circumferential surface 213, the first stepped surface 214 is connected between the first circumferential surface 215 and the second circumferential surface 213, a radial dimension of the first circumferential surface 215 is larger than a radial dimension of the second circumferential surface 213, and the first stepped surface 214 intersects each of the first circumferential surface 215 and the second circumferential surface 213.

Specifically, as shown in fig. 4, the aperture of the first section 212 of the first blind hole 21 is larger than that of the second section 211, and the first section 212 is located below the second section 211, so that the first blind hole 21 is a stepped hole.

The second blind hole 22 includes a third section 222 and a fourth section 221 that communicate in the first direction.

One end of the third section 222 (e.g., a lower end of the third section 222 in fig. 1) penetrates the second surface 23, the other end of the third section 222 (e.g., an upper end of the third section 222 in fig. 1) communicates with the fourth section 221, the second blind hole 22 includes a third circumferential surface 225, a fourth circumferential surface 223, and a second step surface 224, the circumferential surface of the third section 222 forms the third circumferential surface 225, the circumferential surface of the fourth section 221 forms the fourth circumferential surface 223, the second step surface 224 is connected between the third circumferential surface 225 and the fourth circumferential surface 223, a radial dimension of the third circumferential surface 225 is larger than a radial dimension of the fourth circumferential surface 223, and the second step surface 224 intersects each of the third circumferential surface 225 and the fourth circumferential surface 223.

It will be appreciated that, as shown in fig. 4, the aperture of the third section 222 of the second blind hole 22 is larger than the aperture of the fourth section 221, so that the second blind hole 22 is a stepped hole, further, as shown in fig. 4, at least part of the third sealing ring 81 is located in the first section 212, and a side of the third sealing ring 81 adjacent to the second section 211 can abut against the first step surface 214 of the first blind hole 21. Specifically, a portion of the third seal ring 81 in the first direction is located in the first section 212 of the first blind hole 21, the upper end surface of the third seal ring 81 abuts against the first step surface 214, and the peripheral wall surface of the third seal ring 81 is restricted by the peripheral wall surface of the first section 212. Therefore, the peripheral wall surface of the first section 212 of the first blind hole 21 can restrict the movement of the third seal ring 81 in the horizontal direction.

Further, at least a portion of the fourth seal ring 82 is located in the third section 222, and a side of the fourth seal ring 82 adjacent to the fourth section 221 can abut against the second step surface 224 of the second blind hole 22. Specifically, a portion of the fourth seal ring 82 in the first direction is located in the third section 222 of the second blind hole 22, the upper end surface of the fourth seal ring 82 abuts against the second step surface 224, and the peripheral wall surface of the fourth seal ring 82 is limited by the peripheral wall surface of the third section 222. Thus, the peripheral wall surface of the third section 222 of the second blind bore 22 can restrict the fourth seal ring 82 from moving in the horizontal direction.

It will be appreciated that as shown in fig. 4, another portion of the third seal ring 81 in the first direction is located in the second gap 6; likewise, another portion of the fourth seal ring 82 in the first direction is located in the second gap 6.

When the unit cell leaks, the leaked gas can be discharged to the outside from the second gap 6, and thus it is advantageous to improve the accuracy of the air tightness detection.

Therefore, the fuel cell air tightness detection device provided by the embodiment of the invention has the advantage of accurate detection.

In some embodiments, the first through hole 11 includes a fifth section 111 and a sixth section 112.

One end of the fifth section 111 (e.g., an upper end of the fifth section 111 in fig. 1) penetrates the first surface 13, the other end of the fifth section 111 (e.g., a lower end of the fifth section 111 in fig. 1) communicates with the sixth section 112, the first through hole 11 includes a fifth circumferential surface 114, a sixth circumferential surface 116, and a third step surface 115, the circumferential surface of the fifth section 111 forms the fifth circumferential surface 114, the circumferential surface of the sixth section 112 forms the sixth circumferential surface 116, the third step surface 115 is connected between the fifth circumferential surface 114 and the sixth circumferential surface 116, a radial dimension of the fifth circumferential surface 114 is larger than a radial dimension of the sixth circumferential surface 116, and the third step surface 115 intersects each of the fifth circumferential surface 114 and the sixth circumferential surface 116.

As shown in fig. 5, it can be understood that the aperture of the fifth section 111 of the first through hole 11 is larger than that of the sixth section 112, and thus the first through hole 11 is a stepped hole.

Further, as shown in fig. 5, at least part of the first seal ring 71 is located in the fifth section 111, and a side of the first seal ring 71 adjacent to the sixth section 112 can abut against the third step surface 115 of the first through hole 11. Specifically, the lower end surface of the first seal ring 71 abuts against the third step surface 115, and the peripheral wall surface of the first seal ring 71 is restricted by the peripheral wall surface of the fifth step 111. Therefore, the peripheral wall surface of the fifth section 111 of the first through hole 11 can restrict the first seal ring 71 from moving in the horizontal direction.

The second through hole 12 includes an eighth section 121 and a ninth section 122.

One end of the eighth section 121 (e.g., an upper end of the eighth section 121 in fig. 1) penetrates the first surface 13, the other end of the eighth section 121 (e.g., a lower end of the eighth section 121 in fig. 1) communicates with the ninth section 122, the second through hole 12 includes a seventh peripheral surface 124, an eighth peripheral surface 126, and a fourth step surface 125, the peripheral wall surface of the eighth section 121 forms the seventh peripheral surface 124, the fourth step surface 125 is connected between the seventh peripheral surface 124 and the eighth peripheral surface 126, a radial dimension of the seventh peripheral surface 124 is larger than a radial dimension of the eighth peripheral surface 126, and the fourth step surface 125 intersects each of the seventh peripheral surface 124 and the eighth peripheral surface 126.

It will be appreciated that, as shown in fig. 5, the aperture of the eighth section 121 of the second through hole 12 is larger than the aperture of the ninth section 122, and thus the second through hole 12 is a stepped hole.

Further, at least a portion of the second seal ring 72 is located in the eighth segment 121, and a side of the second seal ring 72 adjacent to the ninth segment 122 can abut against the fourth step surface 125 of the second through hole 12. The lower end surface of the second seal ring 72 abuts against the fourth step surface 125, and the peripheral wall surface of the second seal ring 72 is restricted by the peripheral wall surface of the eighth segment 121. Therefore, the circumferential wall surface of the eighth section 121 of the second through hole 21 can restrict the second seal ring 72 from moving in the horizontal direction.

It will be appreciated that as shown in fig. 5, another portion of the first seal ring 71 in the first direction is located in the first gap 9; likewise, another portion of the second seal ring 72 in the first direction is located in the first gap 9.

Therefore, when the single cell leaks, the leaked gas can be discharged from the first gap 9 to the outside, and thus it is advantageous to improve the accuracy of the air tightness detection. Therefore, the fuel cell air tightness detection device provided by the embodiment of the invention has the advantages of good air tightness and accurate detection.

In some embodiments, as shown in fig. 3-6, the first through hole 11 further includes a seventh segment 113, the sixth segment 112 being located between the fifth segment 111 and the seventh segment 113.

A portion of the first positioning member 42 mates with the sixth section 112 of the first through hole 11.

Further, as shown in fig. 6, the first through hole 11 has a first connection section 117, and at least part of the sixth section 112 of the first through hole 11 forms the first connection section 117. Specifically, the sixth section 112 of the first through hole 11 has an internal thread thereon, which is the first connection section 117 of the first through hole 11.

As shown in fig. 3, the first positioning member 42 includes a first connecting portion 424 and a first positioning portion 425.

Specifically, as shown in fig. 3 to 6, the first connection part 424 is located at a lower portion of the first positioning member 42, and external threads may be provided on an outer circumferential surface of the first connection part 424.

As shown in fig. 3-6, the second through hole 12 further includes a tenth section 123, and a ninth section 122 is located between the eighth section 121 and the tenth section 123.

Portions of the second positioning member 52 cooperate with the ninth section 122 of the second through hole 12.

As shown in fig. 6, the second through hole 12 has a second connection section 127, and at least part of the ninth section 122 of the second through hole 12 forms the second connection section 127. Specifically, the ninth section 122 of the second through hole 12 has an internal threaded section, which is the second connecting section 127 of the second through hole 12.

As shown in fig. 6, the second positioning member 52 includes a first connecting portion 524 and a first positioning portion 525.

Specifically, as shown in fig. 3 to 6, the second connection portion 524 is located at a lower portion of the second positioning member 52, and external threads may be provided on an outer circumferential surface of the second connection portion 524.

Further, the first connection portion 424 can be mated with the first connection section 117 so that the first positioning member 42 can be fixedly connected in the first through hole 11. Specifically, the first connection section 117 of the first through hole 11 can be fixedly connected with the first connection portion 424 of the first positioning member 42 by screw-fitting.

The second connection portion 524 is capable of mating with the second connection section 127 so that the second positioning member 52 can be fixedly connected within the second through hole 12. Specifically, the second connection section 127 of the second through hole 12 can be fixedly connected with the second connection portion 524 of the second positioning member 52 by screw-fitting.

It will be appreciated that the first positioning member 42 is fixedly disposed within the first through hole 11; the second positioning member 52 is fixedly disposed in the second through hole 12, so that the positions of the first positioning member 42 and the second positioning member 52 are fixed, thereby facilitating the positioning of the first positioning member 42 and the second positioning member 52 on the unit cell 3.

Further, as shown in fig. 3, at least a portion of the first positioning portion 425 can extend into the first blind hole 21.

As shown in fig. 3, at least a portion of the second positioning portion 525 can extend into the second blind hole 22. It will be appreciated that the first positioning portion 425 of the first positioning member 42 fixed to the first platen 1 is inserted into the first blind hole 21; the second positioning portion 525 of the second positioning member 52 fixed to the second pressing plate 2 is inserted into the second blind hole 22. Therefore, the first platen 1 positions the second platen 2 by the first positioning portion 425 and the second positioning portion 525.

As shown in fig. 6, the third end 412 of the first venting member 41 is in sealing engagement with the seventh section 113 of the first through-hole 11; the seventh end 512 of the second venting member 51 is in sealing engagement with the tenth section 123 of the second venting aperture 12.

Specifically, as shown in fig. 6, the outer peripheral wall of the seventh section 113 of the first through hole 11 has a seal female screw, and the outer peripheral surface of the third end 412 of the first breather piece 41 has a seal male screw that can be fitted with the seal female screw in the first through hole 11. Thus, the third end 412 of the first venting member 41 can be sealingly connected with the seventh section 113 of the first through-hole 11.

The seventh end 512 of the second venting member 51 is in sealing engagement with the tenth section 123 of the second venting hole 12, specifically, the peripheral wall of the tenth section 123 of the second venting hole 12 has a sealing female thread, and the outer peripheral surface of the seventh end 512 of the second venting member 51 has a sealing male thread engageable with the sealing female thread in the second venting hole 12. Thus, the seventh end 512 of the second venting member 51 is capable of being sealingly connected to the tenth section 123 of the second venting aperture 12.

It will be appreciated that the first venting member 41 is sealingly connected to the first through-hole 11; the second ventilation member 51 is in sealing connection with the second through hole 12, so that gas entering the through hole of the first pressing plate 1 from the inlet of the ventilation member can be prevented from leaking out of a gap between the ventilation member and the through hole, and the air tightness of the fuel cell air tightness detection device of the embodiment of the invention is improved.

Therefore, the fuel cell air tightness detection device provided by the embodiment of the invention has the advantages of easiness in assembly and disassembly and good air tightness.

A fuel cell air tightness detection method according to an embodiment of the present invention is described below with reference to the drawings.

As shown in fig. 7, the fuel cell air tightness detection method according to the embodiment of the present invention includes the fuel cell air tightness detection device according to any of the above embodiments, including the steps of:

the single cell 3 is arranged between the first pressing plate 1 and the second pressing plate 2;

compressing the first pressing plate 1 and the second pressing plate 2;

introducing constant-pressure gas into the inner cavity of the single cell 3 by utilizing a gas source s1 to enable the pressure in the inner cavity of the single cell 3 to reach P;

after the time t, the pressure in the inner cavity of the cell 3 is detected, and whether the cell 3 leaks is determined.

In some embodiments, detecting the pressure in the internal cavity of the cell 3 over time t, determining whether the cell 3 is leaking further comprises:

If the pressure in the inner cavity of the single cell 3 decreases, the single cell 3 leaks;

if the pressure in the inner cavity of the cell 3 is unchanged, the cell 3 is not air-tight.

Specifically, as shown in fig. 7, the single cell 3 is positioned and locked on the first pressing plate 1 by the first positioning member 42 and the second positioning member 52, and the single cell 3 is pressed by the second pressing plate 2. For example, a plurality of screw holes are provided on the first platen 1 as shown in fig. 1. The second pressing plate 2 is provided with a plurality of threaded through holes, and the first pressing plate 1 and the second pressing plate 2 are pressed tightly through bolts in threaded holes.

The constant pressure gas from the gas source s1 is sent out through the first outlet s11 and enters the airtight detector s2 through the first inlet s 21. The constant pressure gas is discharged through the second outlet s22 and enters the first and second vent members 41 and 51 through the second and third inlets s4 and s5, whereby the constant pressure gas is fed into the fuel cell air tightness detection device.

Constant pressure gas is introduced into the inner chambers of the single cells 3 through the first ventilation positioning member 4 and the second ventilation positioning member 5, respectively, and the pressure of the inner chambers is observed through the airtight detector s 2. When the pressure value reaches a certain value, for example when the pressure value reaches 10KN, the gas source s1 is shut off and the device is kept sealed. After waiting for a certain time, for example, after waiting for 3 seconds, the value displayed by the airtight detector s2 is observed, and if the pressure in the inner cavity of the cell 3 decreases, the cell 3 leaks; if the pressure in the inner cavity of the cell 3 is unchanged, the cell 3 is not air-tight.

Therefore, the detection device of the fuel cell air tightness detection method provided by the embodiment of the invention has the advantages of high detection precision, simple detection mode and the like.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims

1. A fuel cell air tightness detection device, characterized by comprising:

The first pressing plate and the second pressing plate are oppositely arranged in a first direction, a single cell of the fuel cell can be located between the first pressing plate and the second pressing plate in the first direction, the first pressing plate comprises a first through hole and a second through hole which are arranged at intervals in a second direction, the second pressing plate comprises a first blind hole and a second blind hole which are arranged at intervals in the second direction, the first through hole and the first blind hole can correspond to each other in the first direction, the second through hole and the second blind hole can correspond to each other in the first direction, the interval distance between the first through hole and the second through hole on the first pressing plate is equal to the interval distance between the first blind hole and the second blind hole on the second pressing plate, and the first direction is perpendicular to the second direction; and

a first vent positioning assembly and a second vent positioning assembly, the first vent positioning assembly being capable of cooperating with each of the first through hole and the first blind hole to position the first platen and the second platen, the first vent positioning assembly being adapted to be connected to a gas source to vent gas into the interior cavity of the cell, the second vent positioning assembly being capable of cooperating with each of the second through hole and the second blind hole to position the first platen and the second platen, the second vent positioning assembly being adapted to be connected to a gas source to vent gas into the interior cavity of the cell;

The first ventilation positioning assembly comprises a first positioning piece and a first ventilation piece, the first ventilation piece is matched with the first through hole, the first positioning piece can be matched with each of the first through hole and the first blind hole, the first positioning piece is provided with a first ventilation cavity, the first ventilation hole can be communicated with the first ventilation cavity and the inner cavity of the single cell, the second ventilation positioning assembly comprises a second positioning piece and a second ventilation piece, the second ventilation piece is matched with the second ventilation hole, the second positioning piece can be matched with each of the second through hole and the second blind hole, the second positioning piece is provided with a second ventilation cavity, and the second ventilation cavity can be communicated with the second ventilation cavity and the inner cavity of the single cell;

the first positioning member includes a first end and a second end, the first end of the first positioning member is disposed in the first through hole, the second end of the first positioning member is capable of being disposed in the first blind hole, the first vent hole includes a first end portion and a second end portion, the first end portion of the first vent hole penetrates an end face of the first end of the first positioning member, the second end portion of the first vent hole penetrates at least one of an end face of the second end of the first positioning member and an outer peripheral face of the first positioning member,

2. The fuel cell tightness detection device according to claim 1, further comprising a first seal assembly and a second seal assembly, the first seal assembly being capable of being provided between the first pressure plate and the single cell to avoid leakage of gas from between the first pressure plate and the single cell, the second seal assembly being capable of being provided between the second pressure plate and the single cell to avoid leakage of gas from between the second pressure plate and the single cell.

3. The fuel cell air tightness detection device according to claim 2, wherein the first pressing plate includes a first surface adjacent to the second pressing plate in the first direction, the second pressing plate includes a second surface adjacent to the first pressing plate in the first direction,

one side of the second sealing component in the first direction is abutted against the second surface of the second pressing plate, and the other side of the second sealing component in the first direction is suitable for being abutted against the fourth surface of the single cell.

4. The fuel cell tightness detection device according to claim 3, wherein the first sealing assembly comprises a first sealing ring and a second sealing ring, the first sealing ring can be sleeved on the first positioning piece, and the second sealing ring can be sleeved on the second positioning piece;

5. The fuel cell air tightness detection device according to claim 4, wherein the first blind hole includes a first section and a second section that communicate in the first direction, one end of the first section penetrates the second surface, the other end of the first section communicates with the second section, the first blind hole includes a first peripheral surface, a second peripheral surface, and a first step surface, a peripheral wall surface of the first section forms the first peripheral surface, a peripheral wall surface of the second section forms the second peripheral surface, the first step surface is connected between the first peripheral surface and the second peripheral surface, a radial dimension of the first peripheral surface is larger than a radial dimension of the second peripheral surface, and the first step surface intersects each of the first peripheral surface and the second peripheral surface;

6. The fuel cell tightness detection device according to claim 5, wherein at least part of the third seal ring is located in the first section, and a side of the third seal ring adjacent to the second section can abut against the first step surface of the first blind hole;

7. The fuel cell air tightness detection device according to claim 4, wherein the first through hole includes a fifth section and a sixth section, one end of the fifth section penetrates through the first surface, the other end of the fifth section communicates with the sixth section, the first through hole includes a fifth peripheral surface, a sixth peripheral surface, and a third step surface, a peripheral wall surface of the fifth section forms the fifth peripheral surface, a peripheral wall surface of the sixth section forms the sixth peripheral surface, the third step surface is connected between the fifth peripheral surface and the sixth peripheral surface, a radial dimension of the fifth peripheral surface is larger than a radial dimension of the sixth peripheral surface, and the third step surface intersects each of the fifth peripheral surface and the sixth peripheral surface;

the second through hole comprises an eighth section and a ninth section, one end of the eighth section penetrates through the first surface, the other end of the eighth section is communicated with the ninth section, the second through hole comprises a seventh circumferential surface, an eighth circumferential surface and a fourth step surface, the circumferential wall surface of the eighth section forms the seventh circumferential surface, the fourth step surface is connected between the seventh circumferential surface and the eighth circumferential surface, the radial size of the seventh circumferential surface is larger than that of the eighth circumferential surface, and the fourth step surface is intersected with each of the seventh circumferential surface and the eighth circumferential surface.

8. The fuel cell air tightness detection device according to claim 7, wherein,

at least part of the first sealing ring is positioned in the fifth section, and one side of the first sealing ring adjacent to the sixth section can be abutted against the third step surface of the first through hole;

9. The fuel cell air tightness detection device according to claim 7, wherein,

the first through hole further comprises a seventh section, the sixth section is located between the fifth section and the seventh section, and a part of the first positioning piece is matched with the sixth section of the first through hole;

10. The fuel cell air tightness detection device according to any of claims 7 to 9, wherein the first through hole has a first connection section, at least part of the sixth section of the first through hole forming the first connection section;

11. A fuel cell air tightness detection method comprising the fuel cell air tightness detection device according to any of claims 1 to 9, characterized in that the fuel cell air tightness detection method comprises the steps of:

Disposing a cell between the first platen and the second platen;

compressing the first and second platens;

12. The method of claim 11, wherein detecting the pressure in the inner cavity of the cell and determining whether the cell is leaking comprises: