CN111640962A

CN111640962A - Hot-pressing mould for single cell of fuel cell

Info

Publication number: CN111640962A
Application number: CN202010505125.5A
Authority: CN
Inventors: 袁蕴超; 王海峰; 王利生
Original assignee: Fengyuan Xinchuang Technology Beijing Co ltd; Zhejiang Fengyuan Hydrogen Energy Technology Co ltd
Current assignee: Fengyuan Xinchuang Technology Beijing Co ltd; Zhejiang Fengyuan Hydrogen Energy Technology Co ltd
Priority date: 2020-06-05
Filing date: 2020-06-05
Publication date: 2020-09-08

Abstract

The application provides a fuel cell single cell hot pressing mould, a serial communication port, including first template and second template, first template with the second template can the lock mutually to form the shaping space, fuel cell single cell hot pressing mould still includes heating portion and cooling part, the heating portion can be right heat in the shaping space, the cooling part can be right cool off in the shaping space. The hot-pressing die for the single fuel cell provided by the embodiment of the application can cool the proton exchange membrane in the hot-pressing operation of the single fuel cell, ensures that the proton exchange membrane is not damaged due to overhigh temperature, ensures the performance of the cell and improves the yield of the single cell.

Description

Hot-pressing mould for single cell of fuel cell

Technical Field

The application belongs to the technical field of fuel cells, and particularly relates to a hot-pressing die for a single cell of a fuel cell.

Background

A fuel cell stack is a device that directly generates electric energy from fuel through an electrochemical reaction, and is formed by stacking fuel cells one by one. The single cell technology of the fuel cell is continuously developed and matured, and products are developed towards a more integrated direction. Some fuel cell products begin to use the integration technology of single unit cell to bond the sealing gasket with the bipolar plate and the membrane electrode.

The sealant in the middle of the single cell is mostly made of hot-pressing curing materials, and the curing temperature is 120-160 ℃. The proton exchange membrane used in the fuel cell can bear the highest temperature of not more than 120 ℃, and can cause the proton exchange membrane to wrinkle and vitrify when being in a higher temperature for a long time, thereby affecting the performance of a single cell, even causing the proton exchange membrane to break and affecting the yield of the single cell.

Disclosure of Invention

Therefore, an object of the present invention is to provide a hot-pressing mold for a single cell of a fuel cell, which can cool a proton exchange membrane during hot-pressing operation of the single cell of the fuel cell, ensure that the proton exchange membrane is not damaged due to an excessive temperature, ensure the performance of the cell, and improve the yield of the single cell.

In order to solve the above problem, the present application provides a fuel cell hot pressing mold, including first template and second template, first template with the second template can the lock mutually to form the shaping space, fuel cell hot pressing mold still includes heating portion and cooling part, heating portion can be right heat in the shaping space, cooling part can be right cool off in the shaping space.

Preferably, the heating part and/or the cooling part is provided on the first mold plate;

and/or the heating part and/or the cooling part are/is arranged on the second template.

Preferably, the unit cell to be molded is located in the molding space, the cooling portion is in contact with a first region of the unit cell to be molded to cool the first region, and the heating portion is in contact with a second region of the unit cell to be molded to heat the second region.

Preferably, the cooling part includes a cooling unit provided on the first mold plate.

Preferably, the cooling portion includes a cooling channel, the cooling channel is disposed in the first mold plate, and a cooling medium is introduced into the cooling channel.

Preferably, the hot pressing mold for the single fuel cell further comprises a first heat insulating member, a first mounting groove is formed in the first mold plate, the first heat insulating member is arranged in the first mounting groove, a first opening is formed in the first heat insulating member, a cooling bump is arranged on the first mold plate, and the cooling bump penetrates through the first opening and abuts against the first area.

Preferably, a gap is reserved between the plane where the opening of the first template is located and the first heat insulation piece so as to form an accommodating space, and the single battery to be molded is located in the accommodating space.

Preferably, the heating part includes a heating unit, the heating unit is disposed on the first mold plate, and after the first mold plate is fastened to the second mold plate, the heating unit contacts the second region.

Preferably, the hot pressing mold for the single fuel cell further comprises a second heat insulation piece, a second installation groove is formed in the second heat insulation piece, the heating unit is arranged in the second installation groove, a second opening is formed in the heating unit, a limiting bump is arranged on the heating unit, and the limiting bump penetrates through the second opening and abuts against the second area.

Preferably, positioning columns are arranged on the first template and/or the second template, positioning holes are formed in the monocells to be molded, and the positioning columns can stretch into the positioning holes.

Advantageous effects

The hot-pressing die for the single fuel cell provided by the embodiment of the invention can cool the proton exchange membrane in the hot-pressing operation of the single fuel cell, ensure that the proton exchange membrane is not damaged due to overhigh temperature, ensure the performance of the cell and improve the yield of the single cell.

Drawings

FIG. 1 is an exploded view of an embodiment of the present application;

FIG. 2 is a side view of an embodiment of the present application;

FIG. 3 is a cross-sectional view of an embodiment of the present application;

FIG. 4 is a schematic structural diagram of a first template according to an embodiment of the present application;

FIG. 5 is a schematic view of a first thermal shield according to an embodiment of the present application;

FIG. 6 is a schematic view of a first form and a first insulation element in combination according to an embodiment of the present application;

FIG. 7 is a schematic structural diagram of a second template according to an embodiment of the present application;

fig. 8 is a schematic structural view of a heating element according to an embodiment of the present application;

FIG. 9 is a schematic view of a second thermal shield according to an embodiment of the present application;

fig. 10 is a schematic view of a combined second template, heating element, and second thermal shield according to an embodiment of the present application.

The reference numerals are represented as:

1. a first template; 11. a first mounting groove; 12. cooling the bump; 13. a cooling channel; 2. a first thermal insulation member; 21. a first opening; 3. a second template; 31. a second mounting groove; 4. a heating unit; 41. a second opening; 5. a second thermal insulation member; 51. a limiting bump; 6. forming a single cell; 61. a first electrode plate; 62. a membrane electrode; 63. a second polar plate.

Detailed Description

Referring to fig. 1 to 10 in combination, according to an embodiment of the present application, a hot-pressing mold for a single fuel cell includes a first mold plate 1 and a second mold plate 3, where the first mold plate 1 and the second mold plate 3 can be engaged to form a molding space, and a heating portion and a cooling portion, where the heating portion can heat the inside of the molding space, and the cooling portion can cool the inside of the molding space. The cooling part is arranged, so that the cooling part can cool the inside of the forming space, the proton exchange membrane can be cooled in the hot-pressing operation of the single fuel cell, the proton exchange membrane is prevented from being damaged due to overhigh temperature, the performance of the cell is ensured, and the yield of the single cell is improved.

Further, the fuel cell unit is composed of three main components of a first electrode plate 61, a second electrode plate 63, and a membrane electrode 62, wherein the membrane electrode 62 is located between the first electrode plate 61 and the second electrode plate 63.

Further, first template 1 and second template 3 are the cuboid structure, and first template 1 and second template 3 are all whole to be the groove line, and the notch is detained relatively and is established to form the shaping space.

Further, the heating portion is used to heat the position where heating is required in the hot pressing of the unit cell 6 to be molded. The cooling unit can cool the proton exchange membrane during the hot-pressing operation of the fuel cell.

Further, the second template 3 is positioned above the first template 1, and during hot pressing, the second template 3 moves downwards and is arranged at the top of the first template 1 in a buckling mode.

The heating part and/or the cooling part are/is arranged on the first template 1;

and/or, a heating portion and/or a cooling portion is provided on the second template 3.

In this embodiment, the heating part is provided on the second template 3, the cooling part is provided on the first template 1, and when the second template 3 is lifted, the temperature of the first template 1 is low, which does not affect the operation of the process personnel, and is optimal in process design.

The electric cell 6 to be molded is located in the molding space, the cooling portion is in contact with a first region of the electric cell 6 to be molded to cool the first region, and the heating portion is in contact with a second region of the electric cell 6 to be molded to heat the second region. The influence of the high temperature of the hot pressing on the performance of the single cell is effectively reduced by cooling the first region by the cooling part and heating the second region by the heating part alone.

Further, the first region is a single cell effective region, namely a region where the proton exchange membrane is located.

The second region is the fuel cell sealing region, i.e. the region where the sealant of the single cell 6 to be formed is located.

Further, the shape of the end of the cooling portion in contact with the first region is the same as the shape of the first region. The shape of one end of the heating portion in contact with the second region is the same as the shape of the second region.

The cooling portion includes a cooling unit provided on the first mold plate 1. Cooling of the first region is achieved by providing a cooling unit.

The cooling part comprises a cooling channel 13, the cooling channel 13 is arranged in the first template 1, and a cooling medium is introduced into the cooling channel 13.

Further, the cooling channels 13 are arranged in the first mold plate 1 in an S-shaped periodic manner, so that the uniformity of cooling is ensured.

Further, the cooling medium is water or air.

Further, the cooling medium is introduced into the cooling channel 13 from the inlet end of the cooling channel 13, and is discharged from the outlet end after flowing through the cooling channel 13.

Further, the first template 1 is made of metal material.

The hot-pressing die for the single fuel cell further comprises a first heat insulating piece 2, a first mounting groove 11 is formed in the first template 1, the first heat insulating piece 2 is arranged in the first mounting groove 11, a first opening 21 is formed in the first heat insulating piece 2, a cooling bump 12 is arranged on the first template 1, and the cooling bump 12 penetrates through the first opening 21 and abuts against the first area. Through setting up first heat insulating part 2, can make the cooling concentrate on first region, the first regional cooling degree of better assurance can also prevent to get into the second region to cold volume, influences the regional heating effect of second.

Further, the first installation groove 11 has the same shape as the first heat insulating member 2, and the first heat insulating member 2 is fitted into the first installation groove 11.

Further, the cooling projections 12 pass through the first openings 21 of the first insulating member 2 and directly contact the first region, so that the first region can be directly cooled. The end of the first cooling bump 12 connected to the first region is a cooling end, and the shape of the cooling end is the same as that of the first region.

Further, the cooling bump 12 is a rectangular parallelepiped. The first heat insulator 2 is a rectangular frame.

Further, the cooling projections 12 are located at intermediate positions of the first mold plate 1.

A gap is reserved between the plane of the opening of the first template 1 and the first heat insulation piece 2 to form a containing space, and the single battery 6 to be molded is positioned in the containing space. Through setting up accommodation space, for treating the shaping monocell 6 provides the space, also can treat shaping monocell 6 to carry on spacingly simultaneously.

Further, considering the temperature variation of the die during use and the dimensional tolerance in the processing of the single cell electrode plate, the size of the accommodating space is generally larger than the size of the single cell by more than 0.5mm in the length and width directions. In the height direction, the accommodating space and the single battery should have a margin of more than 0.05 mm.

Further, a gap is formed between the plane where the opening of the first template 1 is located and the first heat insulation piece 2, that is, after the first heat insulation piece 2 is placed in the installation groove of the first template 1, a groove is formed between the top of the first heat insulation piece 2 and the opening of the first template 1, and the groove is an accommodation space.

The heating part comprises a heating unit 4, the heating unit 4 is arranged on the first template 1, and after the first template 1 is buckled with the second template 3, the heating unit 4 is contacted with the second area.

Further, the second area is the area where the sealant is located, and the heating unit 4 is used for heating the sealant.

Further, the shape of the heating unit 4 is the same as that of the second region.

Further, the heating unit 4 provides heat through an electrically heated shape and is capable of controlling temperature.

The hot-pressing die for the single fuel cell further comprises a second heat insulation piece 5, a second installation groove 31 is formed in the second heat insulation piece 5, the heating unit 4 is arranged in the second installation groove 31, a second opening 41 is formed in the heating unit 4, a limiting lug 51 is arranged on the heating unit 4, and the limiting lug 51 penetrates through the second opening 41 and abuts against the second area. The periphery of the sealing portion of the heating unit 4 and the unit cell 6 to be molded is surrounded by the heat insulating plate, a temperature gradient is formed on the unit cell, the temperature of the sealing portion is high, and the temperature of the membrane electrode 62 portion is low.

Further, the contact of the heating unit 4 and the second heat insulator 5 with the second region can also prevent the deformation of the plate during hot pressing.

Further, the heating unit 4 is embedded in the second mounting groove 31.

Further, in this embodiment, the number of the second openings 41 is 7, and the number of the limiting protrusions 51 is 7, wherein 1 limiting protrusion 51 is located in the middle of the second mold plate 3, and has a rectangular shape. Wherein 3 spacing lugs 51 set up the one side at this cuboid, and 3 spacing lugs 51 set up the opposite side at this cuboid in addition.

Further, the second opening 41 has the same cross-sectional shape as the corresponding limit projection 51.

Further, the depth of the second mounting groove 31 is the same as the height of the heating unit 4.

Further, the first heat insulating member 2 and the second heat insulating member 5 may be selected from phenolic plastics or heat insulating ceramics.

Positioning columns are arranged on the first template 1 and/or the second template 3, positioning holes are formed in the monocells 6 to be formed, and the positioning columns can stretch into the positioning holes.

Furthermore, in this embodiment, the first template 1 is provided with a positioning column, and the positioning column penetrates into the positioning hole on the to-be-formed single cell 6 to realize positioning, so that the polar plates are not dislocated during pressing.

In one embodiment, the temperature of the heating unit 4 is set to 140 ℃ to 150 ℃ and the temperature of the cooling unit is set to 60 ℃ to 80 ℃. For fast curing rubbers, the cure time at 140 ℃ can be controlled to be around 6 minutes.

The hot-pressing die for the single fuel cell provided in the embodiment can cool the proton exchange membrane in the hot-pressing operation of the single fuel cell, so that the proton exchange membrane is not damaged due to overhigh temperature, the performance of the cell is ensured, and the yield of the single cell is improved.

It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.

The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed. The foregoing is only a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present application, and these modifications and variations should also be considered as the protection scope of the present application.

Claims

1. The hot-pressing mold for the single fuel cell is characterized by comprising a first mold plate (1) and a second mold plate (3), wherein the first mold plate (1) and the second mold plate (3) can be buckled with each other to form a molding space, the hot-pressing mold for the single fuel cell further comprises a heating part and a cooling part, the heating part can heat the molding space, and the cooling part can cool the molding space.

2. The fuel cell single cell hot-pressing mold according to claim 1, characterized in that the heating portion and/or the cooling portion is provided on the first mold plate (1);

and/or the heating section and/or the cooling section are/is provided on the second template (3).

3. A fuel cell hot-press mold according to claim 1, characterized in that the cell (6) to be molded is located in the molding space, the cooling portion is in contact with a first region of the cell (6) to be molded to cool the first region, and the heating portion is in contact with a second region of the cell (6) to be molded to heat the second region.

4. The fuel cell hot-pressing mold according to claim 1, characterized in that the cooling portion includes a cooling unit provided on the first mold plate (1).

5. The hot-pressing mold for the single fuel cell according to claim 1, wherein the cooling portion includes a cooling channel (13), the cooling channel (13) is provided in the first mold plate (1), and a cooling medium is introduced into the cooling channel (13).

6. The hot-pressing mold for the single fuel cell according to claim 3, further comprising a first heat insulating member (2), wherein a first mounting groove (11) is formed in the first mold plate (1), the first heat insulating member (2) is disposed in the first mounting groove (11), a first opening (21) is formed in the first heat insulating member (2), a cooling protrusion (12) is formed in the first mold plate (1), and the cooling protrusion (12) penetrates through the first opening (21) and abuts against the first region.

7. The hot-pressing die for the single fuel cell as claimed in claim 6, wherein a gap is formed between the plane of the opening of the first template (1) and the first heat insulating member (2) to form a containing space, and the single cell (6) to be molded is positioned in the containing space.

8. The hot-pressing mold for a single fuel cell according to claim 3, wherein the heating portion includes a heating unit (4), the heating unit (4) is provided on the first mold plate (1), and the heating unit (4) is in contact with the second region after the first mold plate (1) is engaged with the second mold plate (3).

9. The hot-pressing mold for the single fuel cell according to claim 8, further comprising a second heat insulating member (5), wherein a second mounting groove (31) is formed in the second heat insulating member (5), the heating unit (4) is disposed in the second mounting groove (31), a second opening (41) is formed in the heating unit (4), a limit projection (51) is disposed on the heating unit (4), and the limit projection (51) penetrates through the second opening (41) and abuts against the second region.

10. The hot-pressing die for the single fuel cell as claimed in claim 3, wherein positioning columns are arranged on the first template (1) and/or the second template (3), positioning holes are arranged on the single cell (6) to be formed, and the positioning columns can extend into the positioning holes.