CN212182462U

CN212182462U - Bipolar plate for methanol fuel cell

Info

Publication number: CN212182462U
Application number: CN202021128336.3U
Authority: CN
Inventors: 张晓飞; 刘云鹤
Original assignee: Chengde Petroleum College
Current assignee: Chengde Petroleum College
Priority date: 2020-06-17
Filing date: 2020-06-17
Publication date: 2020-12-18
Anticipated expiration: 2030-06-17

Abstract

The utility model discloses a bipolar plate for a methanol fuel cell, which comprises a cathode plate and an anode plate, wherein a sealing groove positioned at the periphery of a water flow field is arranged on the combining surface of one of the cathode plate and the anode plate, a sealing boss positioned at the periphery of the water flow field is arranged on the combining surface of the other of the cathode plate and the anode plate, the sealing boss is combined with the sealing groove, and a sealing ring is arranged between the sealing boss and the sealing groove; the sealing groove is a V-shaped groove, the cross section of the sealing boss is a bulge with an arc, sealing rings are clamped between two side parts of the sealing boss and two V-shaped surfaces of the sealing groove, a plurality of limiting bulges are uniformly distributed on the sealing boss along the extending direction of the sealing boss, limiting openings corresponding to the limiting bulges in a one-to-one mode are uniformly distributed on the sealing rings along the extending direction of the sealing boss, and the limiting bulges are clamped into the limiting openings. The installation of sealing washer is better reliable and stable in this bipolar plate installation. After the sealing ring is installed, the sealing ring has the function of absorbing stress, and sealing failure caused by deformation is not easy to occur.

Description

Bipolar plate for methanol fuel cell

Technical Field

The utility model belongs to the technical field of the battery, concretely relates to a bipolar plate for methanol fuel cell.

Background

The direct methanol fuel cell is a fuel cell using methanol as an anode active material, and is a kind of proton exchange membrane fuel cell. The electric pile of the methanol fuel cell is a combined structure of a plurality of single cells, and the single cells are fixed by a front end plate and a rear end plate. The battery unit comprises two bipolar plates and a proton exchange membrane component arranged between the bipolar plates. In the prior art, the outer edges of two combined side surfaces of a bipolar plate are provided with circumferential sealing rings. The sealing ring is influenced by high temperature in the assembling process and work of the bipolar plate, the sealing ring can generate stress, the stress enables the sealing ring to be extruded out of the sealing groove during installation, or deformation is generated after installation, the sealing effect is influenced, and sealing failure can be caused seriously.

SUMMERY OF THE UTILITY MODEL

To solve the problems set forth in the background art described above. The utility model provides a bipolar plate for methanol fuel cell, the better reliable and stable of installation of sealing washer in this bipolar plate installation. After the sealing ring is installed, the sealing ring has the function of absorbing stress, and sealing failure caused by deformation is not easy to occur.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a bipolar plate for methanol fuel cell, includes negative plate and anode plate, negative plate and anode plate range upon range of setting, the faying face of negative plate and anode plate is equipped with the rivers passageway, negative plate and anode plate are equipped with rivers import and the rivers export of putting through with the rivers passageway, rivers import, rivers passageway and rivers export form the rivers field that the cooling water passes through, the periphery in rivers field is equipped with the sealing washer, the sealing washer is located between negative plate and the anode plate, its characterized in that: a sealing groove positioned at the periphery of the water flow field is arranged on the combining surface of one of the cathode plate and the anode plate, a sealing boss positioned at the periphery of the water flow field is arranged on the combining surface of the other of the cathode plate and the anode plate, the sealing boss is combined with the sealing groove, and the sealing ring is arranged between the sealing boss and the sealing groove; the sealing groove is a V-shaped groove, the cross section of the sealing boss is a convex part of a circular arc, two side parts of the sealing boss and two V-shaped surfaces of the sealing groove are clamped, the sealing ring is evenly distributed with a plurality of limiting convex parts along the extending direction of the sealing boss, the sealing ring is evenly distributed with limiting openings in one-to-one correspondence with the limiting convex parts along the extending direction of the sealing ring, and the limiting convex parts are clamped into the limiting openings.

The length of the limiting notch is L1, the length of the limiting bulge is L2, and 2mm < L1-L2<5 mm.

Preferably, a transition seam cavity is formed between the top end of the sealing boss and the bottom end of the sealing groove.

Preferably, the limit bulge part is in a convex shape with two arc end faces and side faces in the same extending direction as the seal boss.

The two ends of the limiting openings are arc-shaped, the part of the sealing ring between two adjacent limiting openings is a connecting part, and the part of the sealing ring on two sides of the connecting part, which extends discontinuously, is a sealing part.

Preferably, the cross section of the sealing ring is arc-shaped.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model provides a sealing washer has the spacing opening that is used for precompression positioning action, is compressed tightly in sealed recess before the sealing washer completely, and spacing opening combines with spacing bellying, makes the sealing washer receive the packing force just and is being compressed tightly the in-process and reliably be located sealed recess to this sealed effect of guaranteeing the sealing washer.

On the other hand, the limiting opening in the sealing ring can release the stress generated by the sealing ring, so that the sealing ring is prevented from being influenced by high temperature to generate large stress deformation, and sealing failure is avoided.

Drawings

FIG. 1 is a schematic structural view of a cathode plate of the present invention;

FIG. 2 is a schematic view of the combination structure of the sealing groove and the sealing boss of the present invention;

fig. 3 is a schematic structural view of the sealing boss of the anode plate of the present invention;

fig. 4 is a schematic structural diagram of the middle seal ring of the present invention.

In the figure: 1. a cathode plate; 2. an anode plate; 3. a water flow passage; 4. a water flow inlet; 5. a water flow outlet; 6. a seal ring; 6-1, limiting the gap; 6-2, a connecting part; 6-3, a sealing part; 7. sealing the groove; 8. sealing the boss; 9. a limiting bulge part; 10. and (4) excessive cavity sewing.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-4, the present invention provides the following technical solutions: a bipolar plate for a methanol fuel cell includes a cathode plate 1 and an anode plate 2. The cathode plate 1 and the anode plate 2 are arranged in a stacking way, and the joint surface of the cathode plate 1 and the anode plate 2 is provided with a water flow channel 3. The cathode plate 1 and the anode plate 2 are provided with a water inlet 4 and a water outlet 5 communicated with the water flow passage 3. The water inlet 4, the water channel 3 and the water outlet 5 form a water flow field for cooling water to pass through. Specifically, the cathode plate 1 and the anode plate 2 are metal sheets, and the opposite combination surfaces of the two plate bodies are provided with water flow fields which are correspondingly matched in position. After the cathode plate 1 and the anode plate 2 are combined in a stacking way, a water flow channel from a water flow inlet 4 to a water flow outlet 5 is formed between the cathode plate 1 and the anode plate 2 through the water flow channel 3.

And a sealing ring 6 is arranged on the periphery of the water flow field, and the sealing ring 6 is positioned between the cathode plate 1 and the anode plate 2. Specifically, a sealing groove 7 positioned at the periphery of the water flow field is arranged on the combining surface of one of the cathode plate 1 and the anode plate 2. And a sealing boss 8 positioned at the periphery of the water flow field is arranged on the other bonding surface of the cathode plate 1 and the anode plate 2, and the sealing boss 8 is bonded with the sealing groove 7. The sealing ring 6 is arranged between the sealing boss 8 and the sealing groove 7. In this embodiment, the bonding surface of the cathode plate 1 is provided with a closed-loop sealing groove 7, and the bonding surface of the anode plate 2 is provided with a closed-loop sealing boss 8 whose position and shape are matched.

The seal groove 7 is a V-shaped groove, i.e. the cross-sectional shape of the seal groove 7 is V-shaped. The sealing boss 8 is a boss portion having a circular arc cross section. The sealing ring 6 is clamped between two side parts of the sealing boss 8 and two V-shaped surfaces of the sealing groove 7. The sealing boss 8 is uniformly distributed with a plurality of limiting convex parts 9 along the extending direction of the sealing boss. The sealing rings 6 are uniformly distributed with limiting openings 6-1 corresponding to the limiting protrusions 9 one by one along the extension direction of the sealing rings, and the limiting protrusions 9 are clamped in the limiting openings 6-1. Specifically, the limit protrusion 9 is a protrusion having two arc end faces and side faces in the same extending direction as the seal boss 8, and the limit protrusion 9 and the seal boss 8 are integrally formed. The two ends of the limiting opening 6-1 are arc-shaped. The sealing ring 6 is made of resin rubber and has an arc-shaped cross section. The part of the sealing ring 6 between two adjacent limiting gaps 6-1 is a connecting part 6-2, and the part of the sealing ring 6 on two sides of the connecting part 6-2 extending without interruption is a sealing part 6-3. The two sealing parts 6-3 are respectively pressed and sealed between the two V-shaped surfaces of the sealing groove 7 and the sealing boss 8. In the embodiment, the length of the limiting notch 6-1 is L1, and the length of the limiting protrusion 9 is L2, 2mm < L1-L2<5 mm. After the sealing ring 6 is installed, a gap exists in the extending direction between the limiting opening 6-1 and the limiting protruding part 9, so that the self stress release of the sealing ring 6 is facilitated, and the deformation is reduced.

In the embodiment, a transition cavity 10 is formed between the top end of the sealing boss 8 and the bottom end of the sealing groove 7. The transition slot cavity 10 can be used as a buffer cavity between two sealing surfaces of the sealing groove 7, and can reduce the liquid pressure of the outer side surface of the V-shaped surface of the sealing groove 7 to a certain extent.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a bipolar plate for methanol fuel cell, includes negative plate (1) and anode plate (2), negative plate (1) and anode plate (2) range upon range of setting, the faying face of negative plate (1) and anode plate (2) is equipped with rivers passageway (3), negative plate (1) and anode plate (2) are equipped with rivers import (4) and rivers export (5) of putting through with rivers passageway (3), rivers import (4), rivers passageway (3) and rivers export (5) form the rivers field that the cooling water passes through, the periphery in rivers field is equipped with sealing washer (6), sealing washer (6) are located between negative plate (1) and anode plate (2), its characterized in that: a sealing groove (7) positioned at the periphery of the water flow field is formed in the combining surface of one of the cathode plate (1) and the anode plate (2), a sealing boss (8) positioned at the periphery of the water flow field is formed in the combining surface of the other one of the cathode plate (1) and the anode plate (2), the sealing boss (8) is combined with the sealing groove (7), and the sealing ring (6) is arranged between the sealing boss (8) and the sealing groove (7); sealed recess (7) are the V-arrangement groove, sealed boss (8) be the bellying of cross section for the circular arc, the both sides portion of sealed boss (8) with all the cramp between two V-arrangement faces of sealed recess (7) sealing washer (6), sealed boss (8) have a plurality of spacing bellying (9) along the extending direction equipartition of self, sealing washer (6) along the extending direction equipartition of self with spacing opening (6-1) of spacing bellying (9) one-to-one, spacing bellying (9) card is gone into in spacing opening (6-1).

2. The bipolar plate for a methanol fuel cell as claimed in claim 1, wherein: the length of the limiting notch (6-1) is L1, the length of the limiting bulge (9) is L2, and 2mm < L1-L2<5 mm.

3. The bipolar plate for a methanol fuel cell as claimed in claim 1, wherein: a transition seam cavity (10) is formed between the top end of the sealing boss (8) and the bottom end of the sealing groove (7).

4. The bipolar plate for a methanol fuel cell as claimed in claim 2, wherein: the limiting convex part (9) is in a convex shape with the same extending direction as the sealing lug boss (8) and two arc end faces and side faces.

5. The bipolar plate for a methanol fuel cell as claimed in claim 2, wherein: the two ends of the limiting gaps (6-1) are arc-shaped, the part, located between the two adjacent limiting gaps (6-1), of the sealing ring (6) is a connecting part (6-2), and the part, located on the two sides of the connecting part (6-2), of the sealing ring (6) and extending discontinuously is a sealing part (6-3).

6. The bipolar plate for a methanol fuel cell as claimed in claim 1, wherein: the cross section of the sealing ring (6) is arc-shaped.