CN210837958U

CN210837958U - Sealing structure of fuel cell bipolar plate

Info

Publication number: CN210837958U
Application number: CN201922019949.7U
Authority: CN
Inventors: 刘奔; 施卫建; 胡玮华
Original assignee: Amtek Suzhou Precision Engineering Ltd
Current assignee: Interplex Suzhou Precision Engineering Ltd
Priority date: 2019-11-21
Filing date: 2019-11-21
Publication date: 2020-06-23
Anticipated expiration: 2029-11-21

Abstract

The utility model provides a fuel cell bipolar plate's seal structure, including setting up the marginal cooling channel between anode plate and negative plate and laying first sealed rubber ring and the second sealed rubber ring at anode plate and negative plate surface, and reserve in the both sides of first sealed rubber ring and second sealed rubber ring and have first interval A, second interval A, first interval B and second interval B, be used for placing sealed the inserting, make to have certain space between sealed rubber ring and the marginal cooling channel, the influence of marginal cooling channel to injection moulding process has been reduced, the problem that marginal cooling channel warp has also been solved, and the both sides of sealed rubber ring all can stably set up sealed the inserting, the quality of moulding plastics has been promoted, the overlap has been reduced, the hourglass is glued the scheduling problem, bipolar plate's processing yield has been guaranteed.

Description

Sealing structure of fuel cell bipolar plate

Technical Field

The utility model relates to a fuel cell field especially relates to fuel cell bipolar plate's seal structure.

Background

Fuel cells typically include a membrane electrode assembly and bipolar plates, where the bipolar plates serve primarily to support the fuel cell, conduct electrical current, distribute fuel gas, dissipate heat from reactions, and the like. Among them, sealing of bipolar plates is one of the very important research subjects of fuel cells.

In the conventional bipolar plate sealing design, as shown in fig. 1, a complete groove is formed by designing two complete circles of raised shapes (3 ', 4'), namely, one complete circle of raised shape 3 'is a cooling water channel around the bipolar plate, and the same structure 4' is arranged outside the cooling water channel, and then liquid silica gel is filled in the groove between the two raised shapes (3 ', 4') by using an injection molding process, and the height of the liquid silica gel is flush with the peak positions of the two side shapes, thereby completing injection molding sealing. However, because the projections of the bipolar plate are formed in actual processing, a certain height tolerance which is difficult to control exists, and when glue sealing is performed, the sealing insert needs to press the cavity pipelines (3 ', 4') at two sides as shown in fig. 1 to complete the sealing of the cavity, the liquid silica gel can generate certain stress to the cavity pipelines, so that the cavity pipelines are easily deformed or even collapsed, and thus, poor phenomena such as flash, glue leakage and the like are caused, and finally, the bipolar plate is processed badly.

Disclosure of Invention

In order to solve the problem, the utility model provides a fuel cell bipolar plate's seal structure.

The main contents of the utility model include:

the sealing structure of the fuel cell bipolar plate comprises an anode plate and a cathode plate which are arranged up and down, a cooling pipeline is formed between the anode plate and the cathode plate and comprises an edge cooling channel, cooling grooves are arranged on the peripheries of the inner surfaces of the anode plate and the cathode plate, and the edge cooling channel is surrounded by the two cooling grooves; a first sealing rubber ring is arranged on the outer surface of the anode plate and around the outer side of the edge cooling channel; a second sealing rubber ring is arranged on the outer surface of the cathode plate and around the outer side of the edge cooling channel; a first interval A is formed between the first sealing rubber ring and the edge cooling channel; a second interval A is arranged between the second sealing rubber ring and the edge cooling channel; a first interval B is formed between the first sealing rubber ring and the edge of the anode plate; and a second interval B is arranged between the second sealing rubber ring and the edge of the cathode plate.

Preferably, the first and second spaces a and a are planar structures.

Preferably, the width of the first and second spaces a and a is greater than or equal to 0.3 mm.

Preferably, the first space B and the second space B are planar structures.

Preferably, the distance between the outer edge of the edge cooling channel and the edge of the anode plate or the cathode plate is greater than or equal to 2 mm.

Preferably, a first sealing rubber groove is formed in the anode plate, and the first sealing rubber ring is arranged in the first sealing rubber groove.

Preferably, a second sealing rubber groove is formed in the cathode plate, and the second sealing rubber ring is arranged in the second sealing rubber groove.

The beneficial effects of the utility model reside in that: the utility model provides a fuel cell bipolar plate's seal structure, at first sealed rubber ring, the both sides reservation of second sealed rubber ring has first interval A, second interval A, first interval B and second interval B, be used for placing sealed inserting, make to have certain space between sealed rubber ring and the marginal cooling channel, the influence of marginal cooling channel to injection moulding process has been reduced, the problem that marginal cooling channel warp has also been solved, and the both sides of sealed rubber ring all can stably set up sealed inserting, the quality of moulding plastics has been promoted, the overlap has been reduced, the problem of leaking glue etc., bipolar plate's processing yield has been guaranteed.

Drawings

FIG. 1 is a schematic view of a prior art bipolar plate seal structure;

fig. 2 is a schematic view of the sealing structure of the present invention.

Detailed Description

The technical solution protected by the present invention will be specifically described below with reference to the accompanying drawings.

Please refer to fig. 1 to fig. 2. The utility model provides a fuel cell bipolar plate's seal structure is the improvement of going on current bipolar plate seal structure, as shown in figure 1, current bipolar plate includes anode plate 1 ' and negative plate 2 ' that set up from top to bottom, anode plate 1 ' with be formed with the cooling tube between the negative plate 2 ', the cooling tube includes marginal cooling channel 3 ', in order to form the sealed gluey groove at the edge of bipolar plate, so set up the protruding shaping 4 ' the same with marginal cooling channel 3 ' structure in the outside of marginal cooling channel 3 ', then pack liquid silica gel in the recess that encloses between the two through moulding plastics to form sealed rubber ring.

The utility model discloses in order to avoid liquid silica gel to the extrusion of marginal cooling channel, reduce the appearance of in-process overlap, the hourglass of moulding plastics scheduling problem, cancelled protruding shaping 4 'among the current bipolar plate, and make sealed rubber ring apart from the certain interval of marginal cooling channel to place sealed inserting, not only avoid liquid silica gel and marginal cooling channel's contact, and reduced the phenomenon of overlap, hourglass and glued, promoted the quality of moulding plastics.

Specifically, as shown in fig. 2, the bipolar plate of the present invention includes an anode plate 1 and a cathode plate 2 disposed up and down, a cooling pipe is formed between the anode plate 1 and the cathode plate 2, the cooling pipe includes an edge cooling channel 3, a cooling groove is disposed around the inner surface of the anode plate 1 and the cathode plate 2, that is, two cooling protrusions are disposed around the outer surface of the anode plate 1 and the outer surface of the cathode plate 2, and the edge cooling channel 3 is surrounded by the two cooling grooves; a first sealing rubber ring 10 is arranged on the outer surface of the anode plate 1 and around the outer side of the edge cooling channel 3; a second sealing rubber ring 20 is arranged on the outer surface of the cathode plate 2 and around the outer side of the edge cooling channel 3; the first sealing rubber ring 10 and the edge cooling channel 3 have a first interval A11; a second interval A21 is arranged between the second sealing rubber ring 20 and the edge cooling channel 3; a first interval B12 is formed between the first rubber sealing ring 10 and the edge of the anode plate 1; a second gap B22 is provided between the second sealing rubber ring 20 and the edge of the cathode plate 2.

In one embodiment, the anode plate 1 is provided with a first sealant groove, and the first sealant ring 10 is disposed in the first sealant groove.

In other embodiments, a second sealant groove is formed on the cathode plate 2, and the second sealant ring 20 is disposed in the second sealant groove.

In one embodiment, the first and second spaces a11 and a 21 are planar structures. Preferably, the widths of the first and second spaces a11 and a 21 are greater than or equal to 0.3 mm.

In one embodiment, the first space B12 and the second space B22 are planar structures.

In one embodiment, the distance between the outer edge of the edge cooling channel 3 and the edge of the anode plate 1 or the cathode plate 2 is greater than or equal to 2 mm. The width of the first sealing rubber ring 10 and the second sealing rubber ring 20 can be adaptively reduced relative to the existing width, but it is required that the sealing function is not affected. The first interval A11, the second interval A21, the first interval B12 and the second interval B22 are all set to be planar structures, so that the sealing insert can achieve the sealing purpose by pressing the planar structures, and the injection molding effect is guaranteed.

The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.

Claims

1. The sealing structure of the fuel cell bipolar plate is characterized by comprising an anode plate and a cathode plate which are arranged up and down, wherein a cooling pipeline is formed between the anode plate and the cathode plate and comprises an edge cooling channel, the peripheries of the inner surfaces of the anode plate and the cathode plate are provided with cooling grooves, and the edge cooling channel is surrounded by the two cooling grooves; a first sealing rubber ring is arranged on the outer surface of the anode plate and around the outer side of the edge cooling channel; a second sealing rubber ring is arranged on the outer surface of the cathode plate and around the outer side of the edge cooling channel; a first interval A is formed between the first sealing rubber ring and the edge cooling channel; a second interval A is arranged between the second sealing rubber ring and the edge cooling channel; a first interval B is formed between the first sealing rubber ring and the edge of the anode plate; and a second interval B is arranged between the second sealing rubber ring and the edge of the cathode plate.

2. A seal structure of a fuel cell bipolar plate according to claim 1, wherein said first space a and said second space a are planar structures.

3. A seal structure of a fuel cell bipolar plate according to claim 2, wherein a width of said first space a and said second space a is greater than or equal to 0.3 mm.

4. A seal structure of a fuel cell bipolar plate according to claim 1, wherein said first space B and said second space B are planar structures.

5. A seal structure of a fuel cell bipolar plate according to claim 1, wherein a distance between an outer edge of the edge cooling channel and an edge of the anode plate or the cathode plate is greater than or equal to 2 mm.

6. A seal structure of a fuel cell bipolar plate according to claim 1, wherein a first sealant groove is formed in the anode plate, and the first sealant ring is disposed in the first sealant groove.

7. A sealing structure of a bipolar plate of a fuel cell according to claim 1, wherein a second sealant groove is formed on the cathode plate, and the second sealant ring is disposed in the second sealant groove.