CN101800317A

CN101800317A - Proton exchange membrane fuel cell bipolar plate with gas flow field

Info

Publication number: CN101800317A
Application number: CN201010144009A
Authority: CN
Inventors: 付宇; 吴洪亮; 侯中军; 刘常福; 明平文
Original assignee: Sunrise Power Co Ltd
Current assignee: Sunrise Power Co Ltd
Priority date: 2010-04-09
Filing date: 2010-04-09
Publication date: 2010-08-11

Abstract

The invention relates to a proton exchange membrane fuel cell bipolar plate with a gas flow field. Each flow channel of the flow field is a strip flow channel; and the sectional area of each flow channel gradually reduces along a moving direction of reactive gas from an inlet to an outlet. The proton exchange membrane fuel cell bipolar plate is characterized in that: each flow channel at the inlet of the reactive gas accounts for 30 and 80 percent of the total sectional area of the flow field, and each flow channel at the outlet of the reactive gas accounts for 5 to 90 percent of that of the inlet. The proton exchange membrane fuel cell bipolar plate can maintain the aqueous water in the flow channels of the flow field and promote the discharge of the aqueous water in a cell, so that the water management of the fuel cell is simplified, and the stability in the process of cell running is improved; and the proton exchange membrane fuel cell bipolar plate has the advantages of simple forming process of the flow field, easy realization and low cost, and is suitable for mass production.

Description

A kind of dual polar plates of proton exchange membrane fuel cell that has gas flowfield

Technical field

The present invention relates to the Proton Exchange Membrane Fuel Cells field, relate in particular to the used in proton exchange membrane fuel cell bipolar plates.

Background technology

In the prior art, the dual polar plates of proton exchange membrane fuel cell flow field patterns mainly contains vertical bar shaped runner, serpentine flow path or several forms of netted runner, and distortion is on this basis also arranged.The patent No. is that the patented technology of CN1622377A relates to a proton exchanging film fuel battery flow field structure, is made of mesh flow field and baffling bar.The baffling bar places mesh flow field inside, fluid is distributed by mesh flow field in the part, and the baffling bar that totally is interspersed retrains, thereby reduces the fluid short circuit phenomenon.The patent No. is that the patented technology of CN1822419A relates to a kind of fuel cell serpentine flow structure, and its outlet is located at the center of flow-field plate, and inlet then is located at the two ends of flow-field plate respectively.The patent No. is that the patented technology of CN101459246A relates to another kind of flow field structure, has to be foursquare flow field regions on flow-field plate, and main body then is a vein shape structure.Above-mentioned patented technology can be distributed by strengthening fluid in theory, helps the discharge of water in the flow field, but its actual effect also needs checking, and complex process, is difficult to realize the commercialization application.Also have a kind of fuel battery double plates flow field structure that helps water management, the flow field is a parallel groove, and the bore of the parallel groove in flow field dwindles gradually Zi the outlet that enters the mouth, and is linear decrease, the parallel groove inlet area in flow field: discharge area=2: 1.This bipolar plate flow field structure has effect preferably to preventing the fuel cell aqueous water in battery pile outlet section accumulative total, but is subjected to the restriction of entrance and exit area ratio, can not adapt to the flow field of different entrance and exit area ratios.

Summary of the invention

The object of the present invention is to provide a kind of dual polar plates of proton exchange membrane fuel cell that has gas flowfield, reach the purpose that helps water discharge in the flow field with the long-pending variation of cross section of fluid channel along the mobile direction of reaction gas.For achieving the above object, the technical solution used in the present invention is: a kind of dual polar plates of proton exchange membrane fuel cell that has gas flowfield, each runner in flow field is the bar shaped runner, the sectional area of each runner reduces gradually Zi the traffic direction of outlet along reaction gas that enter the mouth, its structure is the long-pending 30%-80% that accounts for this flow field, place total sectional area of reaction gas porch cross section of fluid channel, and reaction gas exit cross section of fluid channel amasss and is the 5%-90% of porch sectional area.

The dual polar plates of proton exchange membrane fuel cell that has gas flowfield of the present invention, its structure is: described cross section of fluid channel is long-pending to be reduced gradually Zi the traffic direction of outlet along reaction gas that enter the mouth, the width that is runner is constant, the degree of depth reduces gradually, or the degree of depth of runner is constant, width reduces gradually, or the width of runner and the degree of depth all reduce gradually.

The present invention has following advantage:

1. can promote the discharge of inside battery aqueous water, thereby simplify the water management of fuel cell in the inner motive force that keeps liquid towards water of the runner in flow field, improve the stability in the battery operation process;

Forming process is simple, improves by a small margin on existing basis and can realize, and is with low cost, is applicable to mass production.

Description of drawings

The present invention has seven width of cloth accompanying drawings, wherein,

Accompanying drawing 1 is that the bipolar plate runner degree of depth is constant, the flow field structure schematic diagram that width reduces gradually.

Accompanying drawing 2 is that the A of accompanying drawing 1 is to structural representation

Accompanying drawing 3 is that the B of accompanying drawing 1 is to structural representation

Accompanying drawing 4 is that the bipolar plate runner width is constant, the flow field structure schematic diagram that the degree of depth reduces gradually.

Accompanying drawing 5 is that the A of accompanying drawing 4 is to structural representation

Accompanying drawing 6 is that the B of accompanying drawing 4 is to structural representation

Accompanying drawing 7 is that the bipolar plate runner degree of depth is constant, the flow field structure schematic diagram that width reduces gradually.

In the accompanying drawing, 1, reaction gas inlet; 2. reaction gas outlet; 3. the ridge in flow field; 4. runner.

Embodiment

The invention will be further described below in conjunction with accompanying drawing.

Embodiment 1

Shown in accompanying drawing 1-accompanying drawing 3, be that the bipolar plate runner degree of depth is constant, the embodiment that width reduces gradually.The enter the mouth width of 1 place flow field ridge 3 of bipolar plate runner reaction gas is 1.0mm, and runner 4 width are 2.0mm, degree of depth 0.8mm, long-pending 66.7% of this flow field, place sectional area that accounts for of porch cross section of fluid channel; The width that reaction gas exports 2 place flow field ridge 3 is 1.5mm, and runner 4 width are 1.5mm, degree of depth 0.8mm, the outlet flow sectional area for the porch cross section of fluid channel long-pending 75%.

Embodiment 2

Shown in accompanying drawing 4-accompanying drawing 6, be that the bipolar plate runner width is constant, the embodiment that the degree of depth reduces gradually.Bipolar plate runner is 1.0mm at the enter the mouth width of 1 place flow field ridge 3 of reaction gas, and runner 4 width are 1.0mm, and runner 4 degree of depth are 1.5mm, long-pending 50% of this flow field, place sectional area that accounts for of porch cross section of fluid channel; The width that reaction gas exports 2 place flow field ridge 3 is 1.0mm, and runner 4 width are 1.0mm, and runner 4 degree of depth are 0.5mm, the exit cross section of fluid channel long-pending for the porch cross section of fluid channel amass 33.3%.

Embodiment 3

As shown in Figure 7, be the embodiment that the bipolar plate runner width and the degree of depth all reduce gradually.Bipolar plate runner is 1.5mm at the enter the mouth width of 1 place flow field ridge 3 of reaction gas, and runner 4 width are 1.5mm, and runner 4 degree of depth are 1.5mm; Behind first turning, the width of flow field ridge 3 is 1.0mm, and runner 4 width are 1.0mm, and runner 4 degree of depth are 1.0mm; The width of exit 2 flow field ridges 3 is 0.5mm, and runner 4 width are 0.5mm, and runner 4 degree of depth are 0.5mm.The exit cross section of fluid channel long-pending for the porch cross section of fluid channel amass 11.1%.

Claims

1. dual polar plates of proton exchange membrane fuel cell that has gas flowfield, each runner in flow field is the bar shaped runner, the sectional area of each runner reduces gradually Zi the traffic direction of outlet along reaction gas that enter the mouth, it is characterized in that reaction gas inlet (1) locates the 30%-80% that runner (4) sectional area accounts for this flow field, place total sectional area, reaction gas exports (2), and to locate runner (4) sectional area be the 5%-90% of porch sectional area.

2. according to the described dual polar plates of proton exchange membrane fuel cell that has gas flowfield of claim 1, it is characterized in that: described cross section of fluid channel is long-pending to be reduced gradually Zi the traffic direction of outlet along reaction gas that enter the mouth, the width that is runner (4) is constant, the degree of depth reduces gradually, or the degree of depth of runner is constant, width reduces gradually, or the width of runner and the degree of depth all reduce gradually.