CN220774424U - Bipolar plate and fuel cell - Google Patents
Bipolar plate and fuel cell Download PDFInfo
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- CN220774424U CN220774424U CN202322150630.4U CN202322150630U CN220774424U CN 220774424 U CN220774424 U CN 220774424U CN 202322150630 U CN202322150630 U CN 202322150630U CN 220774424 U CN220774424 U CN 220774424U
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- 239000000446 fuel Substances 0.000 title claims abstract description 10
- 230000004913 activation Effects 0.000 claims abstract description 51
- 239000007789 gas Substances 0.000 description 21
- 239000012528 membrane Substances 0.000 description 5
- 210000001503 joint Anatomy 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000003487 electrochemical reaction Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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Abstract
The utility model provides a bipolar plate and a fuel cell, wherein the bipolar plate is provided with an activation area, a high-pressure flow channel and a low-pressure flow channel are arranged in the activation area, the inlets of the high-pressure flow channel and the low-pressure flow channel are arranged in parallel, the inlets of the high-pressure flow channel and the low-pressure flow channel are positioned at the inlet side of the activation area, the outlets of the high-pressure flow channel and the low-pressure flow channel are positioned at the outlet side of the activation area, the flow area of the inlet of the high-pressure flow channel is larger than the flow area of the outlet of the high-pressure flow channel, and the flow area of the inlet of the low-pressure flow channel is smaller than the flow area of the outlet of the low-pressure flow channel. The high-pressure flow passage and the low-pressure flow passage in the activation area are arranged in parallel, so that convection of gas is facilitated. The flow area of the inlet of the high-pressure flow channel is larger than that of the outlet of the high-pressure flow channel, the flow area of the inlet of the low-pressure flow channel is smaller than that of the outlet of the low-pressure flow channel, so that the air pressure in the high-pressure flow channel is higher than that in the low-pressure flow channel, and a pressure difference exists between adjacent flow channels.
Description
Technical Field
The utility model relates to the technical field of fuel cells, in particular to a bipolar plate and a fuel cell.
Background
The hydrogen and air of the fuel cell flow in the anode plate and cathode plate flow channels of the bipolar plate, the middle of the anode plate and the cathode plate is a membrane electrode, and the flow direction of the gas in the flow channels is perpendicular to the flow direction of the gas entering the membrane electrode, so that the gas mainly enters the membrane electrode through diffusion and convection, and finally electrochemical reaction is carried out on the catalytic layer. In general, gas mainly enters the membrane electrode through concentration diffusion, but if pressure difference exists between adjacent flow channels, a considerable convection effect can be generated, so that gas flow can enter the membrane electrode more easily, mass transfer loss is reduced, electrochemical performance is improved, liquid water below a ridge can be discharged better, and risk of flooding is reduced.
In the prior art, a periodic alternating arrangement of variable flow channels is employed such that a pressure differential exists between adjacent flow channels. However, the differential pressure of the variable flow path is not constant in the alternating process, and there is a transition phase in which the differential pressure drops to 0 in the middle, and the design is complex. Therefore, a structure capable of always allowing pressure differences to exist in adjacent flow passages is required.
Disclosure of Invention
The utility model provides a bipolar plate and a fuel cell, which are used for achieving the purpose that pressure difference exists between adjacent flow channels.
According to one aspect of the present utility model, there is provided a bipolar plate having an activation region in which a high-pressure flow passage and a low-pressure flow passage are provided, the high-pressure flow passage and the low-pressure flow passage being juxtaposed, inlets of the high-pressure flow passage and the low-pressure flow passage being located on an inlet side of the activation region, outlets of the high-pressure flow passage and the low-pressure flow passage being located on an outlet side of the activation region, a flow area of the inlet of the high-pressure flow passage being larger than a flow area of the outlet of the high-pressure flow passage, and a flow area of the inlet of the low-pressure flow passage being smaller than a flow area of the outlet of the low-pressure flow passage.
Further, the high-pressure flow passage comprises a first thick-diameter section and a first thin-diameter section which are communicated with each other, one end of the first thick-diameter section is positioned at the inlet side of the activation zone, and one end of the first thin-diameter section is positioned at the outlet side of the activation zone; the low-pressure flow passage comprises a second large-diameter section and a second small-diameter section which are communicated with each other, one end of the second small-diameter section is positioned at the inlet side of the activation zone, and one end of the second large-diameter section is positioned at the outlet side of the activation zone.
Further, the cross sections of the first thick-diameter section, the first thin-diameter section, the second thick-diameter section and the second thin-diameter section are all rectangular, wherein the width of the first thin-diameter section is 0.25-0.35mm, the height of the first thin-diameter section is 0.15-0.25mm, the width of the second thin-diameter section is 0.25-0.35mm, and the height of the second thin-diameter section is 0.15-0.25mm; the width of the first thick diameter section is 0.5-1.0mm, the height of the first thick diameter section is 0.25-0.4mm, the width of the second thick diameter section is 0.5-1.0mm, and the height of the second thick diameter section is 0.25-0.4mm.
Further, the length of the first small-diameter section is less than 10% of the length of the high-pressure flow passage, and the length of the second small-diameter section is less than 10% of the length of the low-pressure flow passage.
Further, the flow area of the first small-diameter section is the same as the flow area of the second small-diameter section, the flow area of the first large-diameter section is the same as the flow area of the second large-diameter section, the length of the first small-diameter section is the same as the length of the second small-diameter section, and the length of the first large-diameter section is the same as the length of the second large-diameter section.
Further, a high-pressure flow channel and a low-pressure flow channel form a flow channel group, and the activation area comprises a plurality of flow channel groups which are arranged side by side.
Further, the bipolar plate also has an inlet distribution region and an outlet distribution region, the inlet side of the activation region being in butt joint with the inlet distribution region, the outlet side of the activation region being in butt joint with the outlet distribution region; the inlet distribution area is provided with a branch flow passage, the branch flow passage comprises an inlet main flow passage and an inlet branch flow passage which is branched from the inlet main flow passage, and the flow area of the inlet branch flow passage is smaller than that of the inlet main flow passage; the outlet distribution area is provided with a collecting flow passage, the collecting flow passage comprises an outlet main flow passage and an outlet branch flow passage which is separated from the outlet main flow passage, and the flow area of the outlet branch flow passage is smaller than that of the outlet main flow passage; wherein, an inlet main runner, a high pressure runner and an outlet branch runner are communicated in turn, an inlet branch runner, a low pressure runner and an outlet main runner are communicated in turn.
Further, the cross sections of the inlet branch flow channel and the outlet branch flow channel are rectangular, wherein the width of the inlet branch flow channel is 0.25-0.35mm, the height of the inlet branch flow channel is 0.15-0.25mm, the width of the outlet branch flow channel is 0.25-0.35mm, and the height of the outlet branch flow channel is 0.15-0.25mm.
Further, the inlet branch flow passage is arranged perpendicular to the inlet main flow passage, and the outlet branch flow passage is arranged perpendicular to the outlet main flow passage.
According to another aspect of the present utility model, there is provided a fuel cell comprising the bipolar plate described above.
By applying the technical scheme of the utility model, the bipolar plate is provided with an activation area, a high-pressure flow channel and a low-pressure flow channel are arranged in the activation area in parallel, inlets of the high-pressure flow channel and the low-pressure flow channel are positioned at the inlet side of the activation area, outlets of the high-pressure flow channel and the low-pressure flow channel are positioned at the outlet side of the activation area, the flow area of the inlet of the high-pressure flow channel is larger than the flow area of the outlet of the high-pressure flow channel, and the flow area of the inlet of the low-pressure flow channel is smaller than the flow area of the outlet of the low-pressure flow channel. By adopting the scheme, the high-pressure flow passage and the low-pressure flow passage in the activation area are arranged in parallel, which is beneficial to the formation of convection of gas. Gas enters the high-pressure flow channel and the low-pressure flow channel from the inlet side of the activation zone, and leaves the high-pressure flow channel and the low-pressure flow channel from the outlet side of the activation zone. The flow area of the inlet of the high-pressure flow channel is larger than the flow area of the outlet of the high-pressure flow channel, so that compared with the flow area of the flow channel which is unchanged, the pressure in the high-pressure flow channel is increased, the flow area of the inlet of the low-pressure flow channel is smaller than the flow area of the outlet of the low-pressure flow channel, and compared with the flow area of the flow channel which is unchanged, the pressure in the low-pressure flow channel is reduced, and therefore the air pressure in the high-pressure flow channel is higher than the air pressure in the low-pressure flow channel, and a pressure difference exists between adjacent flow channels.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:
fig. 1 shows a schematic structural diagram of a bipolar plate provided by the utility model;
FIG. 2 shows a schematic view of a portion of a bipolar plate provided by the present utility model;
fig. 3 shows a schematic structural diagram of a flow channel group provided by the present utility model.
Wherein the above figures include the following reference numerals:
1. an activation zone; 10. a flow channel group; 11. a high pressure flow path; 111. a first large diameter section; 112. a first small diameter section; 12. a low pressure flow path; 121. a second large diameter section; 122. a second small diameter section;
2. an inlet distribution zone; 21. an inlet primary flow passage; 22. an inlet branch flow passage;
3. an outlet distribution zone; 31. an outlet main flow passage; 32. the outlet branches off the flow channel.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the utility model, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
According to one aspect of the present utility model, as shown in fig. 1 to 3, an arrow in fig. 3 is a flow direction of gas, the bipolar plate has an activation region 1, a high-pressure flow channel 11 and a low-pressure flow channel 12 are provided in the activation region 1, the high-pressure flow channel 11 and the low-pressure flow channel 12 are arranged in parallel, inlets of the high-pressure flow channel 11 and the low-pressure flow channel 12 are located at an inlet side of the activation region 1, outlets of the high-pressure flow channel 11 and the low-pressure flow channel 12 are located at an outlet side of the activation region 1, a flow area of the inlet of the high-pressure flow channel 11 is larger than a flow area of the outlet of the high-pressure flow channel 11, and a flow area of the inlet of the low-pressure flow channel 12 is smaller than a flow area of the outlet of the low-pressure flow channel 12.
By adopting the scheme, the high-pressure flow passage 11 and the low-pressure flow passage 12 in the activation zone 1 are arranged in parallel, so that the gas is facilitated to form convection. The gas enters the high-pressure flow passage 11 and the low-pressure flow passage 12 from the inlet side of the activation zone 1, and leaves the high-pressure flow passage 11 and the low-pressure flow passage 12 from the outlet side of the activation zone 1. The flow area of the inlet of the high pressure flow channel 11 is larger than the flow area of the outlet of the high pressure flow channel 11, so that the pressure in the high pressure flow channel 11 is increased compared with the flow channel with a constant flow area, the flow area of the inlet of the low pressure flow channel 12 is smaller than the flow area of the outlet of the low pressure flow channel 12, and the pressure in the low pressure flow channel 12 is reduced compared with the flow channel with a constant flow area, so that the air pressure in the high pressure flow channel 11 is higher than the air pressure in the low pressure flow channel 12, and a pressure difference exists between adjacent flow channels.
The low pressure flow channel 12 may be understood as a flow channel in which the cross-sectional area at the inlet is reduced, the pressure drop at the upstream of the flow channel is increased, and the pressure at the downstream is decreased, and the flow channel is referred to as the low pressure flow channel 12 as a whole; the high-pressure flow path 11 is also understood to be a flow path in which the cross-sectional area at the inlet is increased, the upstream pressure drop is decreased, and the downstream pressure is increased, and the flow path is referred to as the high-pressure flow path 11 as a whole.
As shown in fig. 3, the high-pressure flow passage 11 includes a first large-diameter section 111 and a first small-diameter section 112 which are communicated with each other, one end of the first large-diameter section 111 is located on the inlet side of the activation zone 1, and one end of the first small-diameter section 112 is located on the outlet side of the activation zone 1; the low-pressure flow passage 12 includes a second large-diameter section 121 and a second small-diameter section 122 which are communicated with each other, one end of the second small-diameter section 122 is located on the inlet side of the activation zone 1, and one end of the second large-diameter section 121 is located on the outlet side of the activation zone 1.
In this manner, the first large diameter section 111 of the high pressure flow path 11 is juxtaposed with the second small diameter section 122 of the low pressure flow path 12, and the first small diameter section 112 of the high pressure flow path 11 is juxtaposed with the second large diameter section 121 of the low pressure flow path 12. The gas pressure of the first large diameter section 111 is different from the gas pressure of the second small diameter section 122, the gas pressure of the first small diameter section 112 is different from the gas pressure of the second large diameter section 121, and a pressure difference is formed between the high pressure flow channel 11 and the low pressure flow channel 12, so that the gas forms convection.
The cross sections of the first thick-diameter section 111, the first thin-diameter section 112, the second thick-diameter section 121 and the second thin-diameter section 122 are rectangular, wherein the width of the first thin-diameter section 112 is 0.25-0.35mm, the height of the first thin-diameter section 112 is 0.15-0.25mm, the width of the second thin-diameter section 122 is 0.25-0.35mm, and the height of the second thin-diameter section 122 is 0.15-0.25mm; the width of the first thick diameter section 111 is 0.5-1.0mm, the height of the first thick diameter section 111 is 0.25-0.4mm, the width of the second thick diameter section 121 is 0.5-1.0mm, and the height of the second thick diameter section 121 is 0.25-0.4mm.
So arranged, the width of the first small diameter section 112 is set to 0.25-0.35mm, the height is set to 0.15-0.25mm, the width of the second large diameter section 121 is set to 0.5-1.0mm, and the height is set to 0.25-0.4mm, so that the pressure difference between the first small diameter section 112 and the second large diameter section 121 is sufficiently obvious, convection can be formed, and the technological processing requirements can be met. The width of the second small diameter section 122 is set to 0.25-0.35mm, the height is set to 0.15-0.25mm, the width of the first large diameter section 121 is set to 0.5-1.0mm, and the height is set to 0.25-0.4mm, so that the pressure difference between the second small diameter section 122 and the first large diameter section 111 is sufficiently remarkable to form convection. In one embodiment of the present utility model, the first small diameter section 112 is set to 0.3mm in width and 0.2mm in height, and the second small diameter section 122 is set to 0.3mm in width and 0.2mm in height.
As shown in fig. 3, the length of the first small diameter section 112 is less than 10% of the length of the high pressure flow path 11, and the length of the second small diameter section 122 is less than 10% of the length of the low pressure flow path 12. By this arrangement, the length of the first and second small diameter sections 112 and 122 is prevented from becoming too long, thereby avoiding the influence on the electrochemical reaction of the end portions.
As shown in fig. 3, the flow area of the first small diameter section 112 is the same as the flow area of the second small diameter section 122, the flow area of the first large diameter section 111 is the same as the flow area of the second large diameter section 121, the length of the first small diameter section 112 is the same as the length of the second small diameter section 122, and the length of the first large diameter section 111 is the same as the length of the second large diameter section 121.
So set up, the flow area and the length of first thin footpath section 112 are the same with second thin footpath section 122, and the length of first thick footpath section 111 is the same with the flow area and the length of second thick footpath section 121, have guaranteed that high-pressure runner 11 and low-pressure runner 12 are the same in the atmospheric pressure of exit, have guaranteed the flow homogeneity of exit.
As shown in fig. 2, one high-pressure flow passage 11 and one low-pressure flow passage 12 constitute one flow passage group 10, and the activation zone 1 includes a plurality of flow passage groups 10, the plurality of flow passage groups 10 being arranged side by side. The arrangement that one high-pressure runner 11 and one low-pressure runner 12 form one runner group 10 makes the high-pressure runner 11 and the low-pressure runner 12 staggered in a plurality of runner groups arranged side by side, and is beneficial to the convection of gas.
As shown in fig. 2, the bipolar plate also has an inlet distribution area 2 and an outlet distribution area 3, the inlet side of the activation area 1 being in butt joint with the inlet distribution area 2, the outlet side of the activation area 1 being in butt joint with the outlet distribution area 3; the inlet distribution area 2 has a branched flow passage including an inlet main flow passage 21 and an inlet branched flow passage 22 branched from the inlet main flow passage 21, the flow area of the inlet branched flow passage 22 being smaller than the flow area of the inlet main flow passage 21; the outlet distribution area 3 is provided with a collecting flow passage, the collecting flow passage comprises an outlet main flow passage 31 and an outlet branch flow passage 32 which is separated from the outlet main flow passage 31, and the flow area of the outlet branch flow passage 32 is smaller than that of the outlet main flow passage 31; wherein an inlet main flow passage 21, a high-pressure flow passage 11 and an outlet branch flow passage 32 are sequentially communicated, and an inlet branch flow passage 22, a low-pressure flow passage 12 and an outlet main flow passage 31 are sequentially communicated.
So configured, gas enters the activation zone 1 from the inlet distribution zone 2 and gas enters the outlet distribution zone 3 from the activation zone 1. The gas is split at the inlet of the activation zone 1, one part of the gas enters the inlet main flow passage 21, and the other part enters the inlet branch flow passage 22. The gas of the outlet main flow passage 31 and the outlet branch flow passage 32 merges in the outlet distribution area 3.
The cross sections of the inlet branch flow passage 22 and the outlet branch flow passage 32 are rectangular, wherein the width of the inlet branch flow passage 22 is 0.25-0.35mm, the height of the inlet branch flow passage 22 is 0.15-0.25mm, the width of the outlet branch flow passage 32 is 0.25-0.35mm, and the height of the outlet branch flow passage 32 is 0.15-0.25mm.
So arranged, the inlet branch flow passage 22 has a width of 0.25-0.35mm and a height of 0.15-0.25mm, such that the flow area of the inlet branch flow passage 22 is smaller than the flow area of the inlet main flow passage 21, such that a pressure difference exists between the inlet main flow passage 21 and the inlet branch flow passage 22. The width of the outlet branch flow channel 32 is 0.25-0.35mm, and the height is 0.15-0.25mm, so that a pressure difference exists between the outlet branch flow channel 32 and the outlet main flow channel 31, the total pressure drop of the two flow channels is the same, and the uniformity of flow is ensured. In one embodiment, the inlet branch flow passage 22 has a width of 0.3mm and a height of 0.2mm, and the outlet branch flow passage 32 has a width of 0.3mm and a height of 0.2mm.
As shown in fig. 2, the inlet branch flow passage 22 is provided perpendicular to the inlet main flow passage 21, and the outlet branch flow passage 32 is provided perpendicular to the outlet main flow passage 31. The arrangement is beneficial to saving space, and meanwhile, the distribution of the flow channels in the bipolar plate is simpler.
According to another aspect of the present utility model, there is provided a fuel cell comprising the bipolar plate described above.
The main idea of the utility model is to make two adjacent flow channels alternate with each other, design a narrowing structure at the inlet and the outlet to make the two flow channels generate pressure drop difference at the inlet, so that a stable pressure difference exists between the two flow channels, and design opposite difference at the outlet end to recover the pressure drop, thereby ensuring the same total pressure drop of the whole flow channel and further not affecting the flow uniformity.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present utility model unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
In the description of the present utility model, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present utility model; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present utility model.
The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (10)
1. The bipolar plate is characterized by comprising an activation zone (1), wherein a high-pressure flow channel (11) and a low-pressure flow channel (12) are arranged in the activation zone (1), the high-pressure flow channel (11) and the low-pressure flow channel (12) are arranged in parallel, inlets of the high-pressure flow channel (11) and the low-pressure flow channel (12) are both positioned on the inlet side of the activation zone (1), outlets of the high-pressure flow channel (11) and the low-pressure flow channel (12) are both positioned on the outlet side of the activation zone (1), the flow area of the inlet of the high-pressure flow channel (11) is larger than the flow area of the outlet of the high-pressure flow channel (11), and the flow area of the inlet of the low-pressure flow channel (12) is smaller than the flow area of the outlet of the low-pressure flow channel (12).
2. The bipolar plate of claim 1 wherein,
the high-pressure flow passage (11) comprises a first thick-diameter section (111) and a first thin-diameter section (112) which are communicated with each other, one end of the first thick-diameter section (111) is positioned at the inlet side of the activation zone (1), and one end of the first thin-diameter section (112) is positioned at the outlet side of the activation zone (1);
the low-pressure flow passage (12) comprises a second large-diameter section (121) and a second small-diameter section (122) which are communicated with each other, one end of the second small-diameter section (122) is positioned at the inlet side of the activation zone (1), and one end of the second large-diameter section (121) is positioned at the outlet side of the activation zone (1).
3. The bipolar plate of claim 2 wherein the first large diameter section (111), the first small diameter section (112), the second large diameter section (121) and the second small diameter section (122) are all rectangular in cross section, wherein,
the width of the first small-diameter section (112) is 0.25-0.35mm, the height of the first small-diameter section (112) is 0.15-0.25mm, the width of the second small-diameter section (122) is 0.25-0.35mm, and the height of the second small-diameter section (122) is 0.15-0.25mm;
the width of the first thick-diameter section (111) is 0.5-1.0mm, the height of the first thick-diameter section (111) is 0.25-0.4mm, the width of the second thick-diameter section (121) is 0.5-1.0mm, and the height of the second thick-diameter section (121) is 0.25-0.4mm.
4. The bipolar plate according to claim 2, wherein the length of the first small diameter section (112) is less than 10% of the length of the high pressure flow channel (11) and the length of the second small diameter section (122) is less than 10% of the length of the low pressure flow channel (12).
5. The bipolar plate according to claim 2, wherein the flow area of the first small diameter section (112) is the same as the flow area of the second small diameter section (122), the flow area of the first large diameter section (111) is the same as the flow area of the second large diameter section (121), the length of the first small diameter section (112) is the same as the length of the second small diameter section (122), and the length of the first large diameter section (111) is the same as the length of the second large diameter section (121).
6. Bipolar plate according to claim 1, characterized in that one of the high-pressure channels (11) and one of the low-pressure channels (12) form a channel group (10), the activation zone (1) comprising a plurality of the channel groups (10), a plurality of the channel groups (10) being arranged side by side.
7. The bipolar plate according to claim 1, characterized in that the bipolar plate further has an inlet distribution area (2) and an outlet distribution area (3), the inlet side of the activation area (1) being in abutment with the inlet distribution area (2), the outlet side of the activation area (1) being in abutment with the outlet distribution area (3);
the inlet distribution area (2) is provided with a branched flow passage, the branched flow passage comprises an inlet main flow passage (21) and an inlet branched flow passage (22) which is branched from the inlet main flow passage (21), and the flow area of the inlet branched flow passage (22) is smaller than that of the inlet main flow passage (21);
the outlet distribution area (3) is provided with a collecting flow passage, the collecting flow passage comprises an outlet main flow passage (31) and an outlet branch flow passage (32) which is separated from the outlet main flow passage (31), and the flow area of the outlet branch flow passage (32) is smaller than that of the outlet main flow passage (31);
wherein, one inlet main runner (21), one high-pressure runner (11) and one outlet branch runner (32) are communicated in sequence, one inlet branch runner (22), one low-pressure runner (12) and one outlet main runner (31) are communicated in sequence.
8. The bipolar plate according to claim 7, wherein the cross sections of the inlet branch flow channel (22) and the outlet branch flow channel (32) are rectangular, wherein the width of the inlet branch flow channel (22) is 0.25-0.35mm, the height of the inlet branch flow channel (22) is 0.15-0.25mm, the width of the outlet branch flow channel (32) is 0.25-0.35mm, and the height of the outlet branch flow channel (32) is 0.15-0.25mm.
9. The bipolar plate according to claim 7, wherein the inlet branch flow channel (22) is arranged perpendicularly to the inlet main flow channel (21), and the outlet branch flow channel (32) is arranged perpendicularly to the outlet main flow channel (31).
10. A fuel cell comprising a bipolar plate according to any one of claims 1 to 9.
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| CN202322150630.4U CN220774424U (en) | 2023-08-10 | 2023-08-10 | Bipolar plate and fuel cell |
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| CN202322150630.4U CN220774424U (en) | 2023-08-10 | 2023-08-10 | Bipolar plate and fuel cell |
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