CN218548489U

CN218548489U - Sealing strip for bipolar plate of hydrogen fuel cell

Info

Publication number: CN218548489U
Application number: CN202222245853.4U
Authority: CN
Inventors: 张盼; 周耀; 李祥
Original assignee: Anhui Yaxinke Sealing Technology Co ltd
Current assignee: Anhui Yaxinke Sealing Technology Co ltd
Priority date: 2022-08-25
Filing date: 2022-08-25
Publication date: 2023-02-28
Anticipated expiration: 2032-08-25

Abstract

The utility model relates to a sealing strip for a bipolar plate of a hydrogen fuel cell, which belongs to the technical field of hydrogen fuel cell sealing and comprises a first base body and a second base body, wherein the cross section of the first base body is provided with a first sealing boss, a first semicircular groove, a first sealing convex peak and a first circular arc groove; the section of the second base body is provided with a second sealing convex peak, a second semicircular groove and a second sealing boss, and when the sealing is carried out, the first base body and the second base body are extruded to form three independent sealing surfaces, so that the sealing performance is improved; the problem of overlarge local stress caused by the fact that no deformation space exists between the first base body and the second base body in the compression process can be solved by arranging the arc groove, the first semicircular groove and the second semicircular groove; the second sealing convex peak at the center is in contact with the first sealing convex peak first, so that air is conveniently discharged, and the sealing effect is prevented from being influenced by overlarge resistance when extrusion is caused by excessive air; finally, the utility model discloses be provided with mistake proofing convex structure, help promoting sealed efficiency.

Description

Sealing strip for bipolar plate of hydrogen fuel cell

Technical Field

The utility model belongs to the technical field of the hydrogen fuel cell seals, specifically, relate to a sealing strip for hydrogen fuel cell bipolar plate.

Background

The hydrogen fuel cell is mainly composed of a membrane electrode plate and a bipolar plate. The Membrane Electrode (MEA) is the core of the fuel cell, and the bipolar plates are important components of the fuel cell, where they function to collect current, distribute gas, support the membrane electrode, and manage water, and heat, and occupy a significant portion of the stack weight and cost. If the fuel cell is not sealed well, the fuel and the oxidant can be leaked or directly contacted, so that the performance of the fuel cell stack is reduced, and the danger of explosion and the like can be generated in serious cases, therefore, the sealing of the fuel cell is very important.

The sealed of hydrogen fuel cell pile generally is the seal groove of certain width of pre-processing and degree of depth on bipolar plate, it makes the sealing strip to reuse specific glue, it is sealed to utilize gluey elasticity to realize, the structure of current sealing strip is single bead structure, the sealing strip cross section is the rectangle, the bubble easily appears in the sealing strip when the installation of the sealing strip of single bead structure, the bubble seriously influences the sealing performance of sealing strip, and simultaneously, the sealing strip of single bead structure is when extrusion seal, the deformation takes place for the sealing strip, deformation leads to the extrusion to pile up, the department stress concentration is piled up in the extrusion, when the sealing strip long time is used, crack and damage can appear in the stress concentration point, need improve the structure of sealing strip urgently, in order to promote its sealing performance and life.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem mentioned in the background art, the utility model provides a sealing strip for a hydrogen fuel cell bipolar plate.

The purpose of the utility model can be realized by the following technical proposal:

a sealing strip for a bipolar plate of a hydrogen fuel cell comprises a first base body and a second base body which are oppositely arranged, wherein a first sealing boss, a first semicircular groove, a first sealing convex peak and a first circular arc groove are arranged on the cross section of the first base body from the axis to two sides in an adjacent sequence; the section of the second base body is provided with a second sealing convex peak, a second semicircular groove and a second sealing boss in adjacent sequence from the axis to two sides;

the first sealing boss and the second sealing boss are arranged oppositely, the first base body and the second base body are extruded to form three independent sealing surfaces, and the sealing performance is enhanced.

Further, the upper surfaces of the first sealing boss and the second sealing boss are both planes, the upper surfaces of the first sealing convex peak and the second sealing convex peak are both semi-arc surfaces, and when the semi-arc surfaces are in contact with the planes, points and surfaces help to prevent residual air on the contact surfaces, and air bubbles exist in the sealing surfaces, so that the sealing performance is reduced.

Furthermore, the vertical distance from the vertex of the second sealing convex peak to the upper surface of the first sealing boss is smaller than the vertical distance from the vertex of the first sealing convex peak to the upper surface of the second sealing boss, and when the first base body and the second base body are mutually extruded, the second sealing convex peak positioned at the center is firstly contacted with the first sealing boss, so that air is conveniently discharged, and the sealing effect is prevented from being influenced by overlarge resistance when the extrusion is caused by too much air.

Further, the subregion has all been seted up to first base member and second base member, and the inboard of the subregion of first base member or second base member is provided with the mistake proofing boss, and the purpose that sets up the mistake proofing boss is the installation mistake who prevents first base member and second base member, helps promoting sealed efficiency.

Furthermore, the corners of the first base body and the second base body are both of a fillet structure, fillet transition is arranged, stress concentration points of sharp corners of the corners are eliminated, the sealing performance of the connection positions of the partitions is guaranteed, and the service lives of the first base body and the second base body are prolonged.

The utility model has the advantages that:

the utility model discloses first base member and second base member have been set up, first base member and second base member mutually support, when sealed, first base member and the extrusion of second base member form three independent sealing faces, the sealed face of base member is improved into three independent sealing face contacts by traditional whole face contact, the contact stress increase of three independent sealing faces, the leakproofness reinforcing, simultaneously, when taking place the extrusion between first base member and the second base member, the outside of first base member and second base member takes place deformation in to the circular arc recess, take place deformation in the inboard of first base member and second base member to first semicircle recess and the second semicircle recess, through setting up the circular arc recess, first semicircle recess and second semicircle recess can avoid first base member and second base member not to have the space of deformation in compression process to lead to the too big problem of local stress, avoid first base member and second base member to be crowded bad and inefficacy, improve the sealing performance of sealing strip.

Then, when the upper surface is the first sealed crest of semicircle face, the sealed crest of second and upper surface are planar first sealed boss and the sealed boss contact of second, the semicircle face is progressively laminated by point and face with the plane, help preventing the contact surface residual air, there is the bubble sealed face inside, can lead to the leakproofness to reduce, the sealed crest of second that lies in the center simultaneously contacts with first sealed boss earlier, the exhaust air of being convenient for, the too big sealed effect of influence of resistance when preventing the too much extrusion that leads to of air.

Finally, the utility model discloses be provided with mistake proofing boss structure, the purpose that is provided with the mistake proofing boss is the installation mistake who prevents first base member and second base member, and the first base member that has the mistake proofing boss constitutes a set of relative setting with the second base member that does not have the mistake proofing boss, sets up the mistake proofing boss, has improved the identifiability of first base member and second base member, helps promoting sealed efficiency.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a front view of a first base body of the present invention;

fig. 2 is a front view of a second base body of the present invention;

fig. 3 is a schematic cross-sectional view of a first substrate according to the present invention;

fig. 4 is a schematic cross-sectional view of a second substrate of the present invention;

fig. 5 is a schematic structural diagram of the first base body and the second base body of the present invention after being installed.

In the drawings, the components represented by the respective reference numerals are listed below:

1. a bipolar plate body; 2. a membrane electrode plate body; 3. a first substrate; 31. an arc groove; 32. a first seal hump; 33. a first semicircular groove; 34. a first seal boss; 4. a second substrate; 41. a second seal boss; 42. a second semicircular groove; 43. a second seal hump; 5. mistake proofing boss.

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 of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention.

A sealing strip for a hydrogen fuel cell bipolar plate is disclosed, and shown in fig. 1 and fig. 2, the sealing strip comprises a first base body 3 and a second base body 4 which are oppositely arranged, the first base body 3 and the second base body 4 are integrally made of rubber, the first base body 3 and the second base body 4 are both in a central symmetry structure, the first base body 3 and the second base body 4 are both provided with partitions, any corner of the first base body 3 and any corner of the second base body 4 are both in a fillet structure, an error-proof boss 5 is arranged on the inner side of any partition of the first base body 3 or the second base body 4, in the embodiment, an error-proof boss 5 is arranged on the inner side of the partition of the first base body 3, the error-proof boss 5 is arranged to prevent the first base body 3 and the second base body 4 from being installed wrongly, and the first base body 3 with the error-proof boss 5 and the second base body 4 without the error-proof boss 5 form a group which is oppositely arranged.

Referring to fig. 3 and 4, the cross section of the first base 3 is designed as a biconvex peak, the cross section of the first base 3 is of an axisymmetrical structure, and the first base 3 is provided with a first sealing boss 34, a first semicircular groove 33, a first sealing peak 32 and a first arc groove 31 in adjacent order from the axis to both sides; the section of the second base body 4 is designed to be a double boss, the section of the second base body 4 is of an axisymmetrical structure, and a second sealing convex peak 43, a second semicircular groove 42 and a second sealing boss 41 are arranged on the second base body 4 from the axis to two sides in an adjacent sequence. Wherein, the upper surfaces of the first sealing boss 34 and the second sealing boss 41 are both planes; the upper surfaces of the first sealing peak 32 and the second sealing peak 43 are both semi-circular arc surfaces; the bottom surfaces of the first semicircular groove 33 and the second semicircular groove 42 are both semicircular arc surfaces.

Referring to fig. 5, the sealing strip of the present invention is used for sealing between a bipolar plate 1 and a membrane electrode plate 2 inside a hydrogen fuel cell, sealing grooves are formed on the bipolar plate 1 and the membrane electrode plate 2, a first substrate 3 and a second substrate 4 are respectively installed in the sealing grooves formed on the bipolar plate 1 and the membrane electrode plate 2, when sealing, a first sealing protrusion 34 and a second sealing protrusion 43 are oppositely disposed, a first sealing protrusion 32 and a second sealing protrusion 41 are oppositely disposed, three independent sealing surfaces are formed by extrusion between the first substrate 3 and the second substrate 4 which are oppositely disposed, and meanwhile, a vertical distance from a vertex of the second sealing protrusion 43 to an upper surface of the first sealing protrusion 34 is smaller than a vertical distance from a vertex of the first sealing protrusion 32 to an upper surface of the second sealing protrusion 41, when extruding, the second sealing protrusion 43 and the first sealing protrusion 34 are in contact first, then, the second sealing protrusion 43 and the first sealing protrusion 34 are in contact again, so as to discharge internal air, excessive internal air is prevented, when extruding, the resistance is excessively large, the sealing effect is prevented, the problem that the first sealing protrusion is prevented by the semi-circular groove 31 and the second sealing groove 33, and the second sealing protrusion 4 are not deformed by the compressive stress of the first sealing protrusion 3 and the second sealing protrusion 4, and the problem that the substrate is avoided.

In the description of the specification, references to the description of "one embodiment," "an example," "a specific example," etc., mean 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 invention. In this specification, the schematic representations of the terms used above do not necessarily refer 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.

The foregoing is merely exemplary and illustrative of the structure of the invention and various modifications, additions or substitutions as are known to those skilled in the art may be made to the described embodiments without departing from the scope of the invention as defined in the accompanying claims.

Claims

1. The sealing strip for the bipolar plate of the hydrogen fuel cell is characterized by comprising a first base body (3) and a second base body (4) which are oppositely arranged, wherein a first sealing boss (34), a first semicircular groove (33), a first sealing convex peak (32) and a first circular arc groove (31) are arranged on the cross section of the first base body (3) from the axis to two sides in an adjacent sequence; a second sealing convex peak (43), a second semicircular groove (42) and a second sealing boss (41) are arranged on the section of the second base body (4) from the axis to two sides in an adjacent sequence;

the first sealing boss (34) and the second sealing boss (43) are arranged oppositely, the first sealing boss (32) and the second sealing boss (41) are arranged oppositely, and the first base body (3) and the second base body (4) are extruded to form three independent sealing surfaces.

2. The sealing strip for a hydrogen fuel cell bipolar plate according to claim 1, wherein the upper surfaces of the first sealing projection (34) and the second sealing projection (41) are both flat surfaces, and the upper surfaces of the first sealing projection (32) and the second sealing projection (43) are both semi-circular arc surfaces.

3. The sealing strip for a hydrogen fuel cell bipolar plate according to claim 1, wherein a perpendicular distance from an apex of the second sealing protrusion (43) to an upper surface of the first sealing protrusion (34) is smaller than a perpendicular distance from an apex of the first sealing protrusion (32) to an upper surface of the second sealing protrusion (41).

4. The sealing strip for the bipolar plate of the hydrogen fuel cell according to claim 1, wherein the first substrate (3) and the second substrate (4) are provided with partitions, and the inner sides of the partitions of the first substrate (3) or the second substrate (4) are provided with error-proof bosses (5).

5. The sealing strip for a hydrogen fuel cell bipolar plate according to claim 4, wherein corners of the first substrate (3) and the second substrate (4) are rounded.