CN111276712A - Double-sided flow field for polar plate for improving material distribution uniformity of fuel cell - Google Patents
Double-sided flow field for polar plate for improving material distribution uniformity of fuel cell Download PDFInfo
- Publication number
- CN111276712A CN111276712A CN201811479827.XA CN201811479827A CN111276712A CN 111276712 A CN111276712 A CN 111276712A CN 201811479827 A CN201811479827 A CN 201811479827A CN 111276712 A CN111276712 A CN 111276712A
- Authority
- CN
- China
- Prior art keywords
- flow field
- grooves
- groove
- trapezoidal
- parallelogram
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0258—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant
- H01M8/026—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant characterised by grooves, e.g. their pitch or depth
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0258—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant
- H01M8/0265—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant the reactant or coolant channels having varying cross sections
-
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Fuel Cell (AREA)
Abstract
The invention relates to a double-sided flow field for a polar plate for improving the material distribution uniformity of a fuel cell, wherein the polar plate is formed by stamping a stainless steel flat plate, grooves which are sunken towards the surface of the plate are arranged on the front surface of the stainless steel plate, and ridges which are protruded towards the outside of the plate are arranged on the back surface corresponding to the grooves; the reverse flow field is formed by arranging a row of flow fields or more than two rows of flow fields which are sequentially arranged from top to bottom and are separated by the strip-shaped protrusions. The flow field is suitable for a sheet stamping process, the front and back surfaces of the flow field are provided with multi-stage disturbance fluid, and the uniformity of material distribution is good; the mass transfer efficiency is improved by the parallel arrangement structure; the mass transfer strengthening effect under the ridge of the parallelogram groove group is good.
Description
Technical Field
The present invention belongs to an improved technology of fuel cell device. In particular to an improved technology of a proton exchange membrane fuel cell flow field.
Background
The flow field structure of the proton exchange membrane fuel cell includes a parallel type, a snake type, an interdigital type and the like.
Although the flow resistance of the parallel flow field is small, the pressure of adjacent grooves is similar, and the mass transfer effect under the ridge is poor. Particularly, a parallel flow field for a cathode of a direct alcohol fuel cell is easy to be flooded by water, water drops block a groove and are difficult to discharge, mass transfer of materials in the blocked area is limited, so that the materials on a reaction interface of the cell are unevenly distributed, and the performance of the cell is reduced.
Although the flow field for the cathode has good drainage effect, the groove has long stroke and large pressure drop, thus increasing the energy consumption of the fuel cell gas supply device; meanwhile, the material concentration of the downstream area of the groove is low, and the problem of poor concentration uniformity of a large-area flow field is particularly obvious.
Although the inter-digitated flow field has good under-ridge mass transfer effect, the flow resistance is large because the inlet and the outlet of the flow field groove are not communicated, the power consumption of auxiliary components of the fuel cell system is increased, and the efficiency of the fuel cell system is reduced.
Therefore, a novel flow field needs to be arranged, the advantages of small flow resistance, good drainage effect and good under-ridge mass transfer effect are achieved, axial mass transfer of the electrode is promoted, material distribution uniformity of a reaction interface of the fuel cell is improved, and performance of the fuel cell is improved.
Disclosure of Invention
The invention aims to provide a flow field with material distribution uniformity, which can promote axial mass transfer of an electrode, improve the material distribution uniformity of a cell reaction interface, improve the performance of a fuel cell, is easy to process and is convenient for large-scale production.
The present invention can be realized by the following means. The polar plate is formed by stamping a stainless steel flat plate, the front surface of the positive and negative surfaces of the stainless steel plate is provided with a groove which is sunken towards the plate surface, and the back surface corresponding to the groove is a ridge which is protruded towards the outside of the plate surface;
front side: the side edges of one inverted trapezoidal groove and the other trapezoidal groove from left to right are arranged at intervals by ridges to form a group of parallelogram groove groups, and more than two groups of parallelogram groove groups arranged at intervals from left to right form a row of flow field; the side edges of the adjacent inverted trapezoids and trapezoidal grooves are arranged at intervals by ridges, the ridges are in a parallelogram shape, and an upper plane and a lower plane are respectively arranged on all the inverted trapezoids and trapezoidal grooves; the front flow field is formed by arranging a row of flow fields or more than two rows of flow fields which are sequentially arranged from top to bottom and are separated by strip-shaped protrusions;
and (3) reverse side: one parallelogram groove and the other parallelogram groove are arranged from left to right at intervals to form a group of splayed groove groups, and more than two groups of splayed groove groups arranged from left to right at intervals form a column of flow field; the side edges of adjacent parallelogram grooves are arranged at intervals by inverted trapezoidal ridges or trapezoidal ridges, the ridges are inverted trapezoidal or trapezoidal, and all the parallelogram grooves are respectively provided with an upper plane and a lower plane;
the reverse flow field is formed by arranging a row of flow fields or more than two rows of flow fields which are sequentially arranged from top to bottom and are separated by the strip-shaped protrusions.
The height of the long strip-shaped protrusion on the front surface or the back surface in the direction vertical to the plate surface is less than or equal to the height of the ridge.
The trapezoidal grooves or ridges mean that the section parallel to the surface of the plate body is trapezoidal, and the parallelogram grooves or ridges mean that the section parallel to the surface of the plate body is parallelogram.
The inverted trapezoidal grooves in one parallelogram groove group are centrosymmetric with the trapezoidal grooves.
And on the front side, the ratio of the horizontal row spacing from left to right of the grooves to the height of the trapezoid from top to bottom is 0.001-0.1.
The proportion of the sum of the planar areas of the grooves to the area of the front surface of the polar plate can be set to be 1/3-2/3.
And the ratio of the depth of the upper bottom edge of the inverted trapezoid or trapezoid groove sunken into the board surface to the depth of the lower bottom edge sunken into the board surface can be set to be 1/10-1.
The ratio of the width of the bottom surface of the groove from left to right to the width of the opening of the groove can be set to be 1/10-1.
The invention has good mass transfer strengthening effect and benefits from the mass transfer under the ridge. The sectional area of the channel at the long side of the trapezoid is larger than that of the channel at the short side of the trapezoid, the speed of fluid entering the sectional area of the channel at the short side of the trapezoid is increased, as shown in fig. 3, the pressure is reduced, as shown in fig. 4, the speed of fluid entering the sectional area of the channel at the long side of the inverted trapezoid is smaller than that of the sectional area of the channel at the short side of the inverted trapezoid, the pressure of the adjacent pressure at the long side of the inverted trapezoid is larger than that of the sectional area of the channel at the short side of the trapezoid, the fluid diffuses along the pressure gradient direction through the diffusion layer.
The matrix arrangement structure improves the mass transfer efficiency. The fluid flow path arranged in the parallel arrangement structure is short, and the flow resistance is small; the sectional type channel is beneficial to fluid mixing and redistribution, and the consistency of the material concentration of the parallel tracks is improved; the multi-stage disturbance fluid distribution formed by the arrangement of the matrix arrangement structure is more uniform.
The flow field is suitable for a sheet stamping process. The front surface is in trapezoidal groove array arrangement, the back surface is in parallelogram groove array arrangement, the front and back surface structures are provided with multistage disturbance fluid, and the uniformity of material distribution is good. The mass transfer efficiency is improved by the parallel arrangement structure; the mass transfer strengthening effect under the ridge of the parallelogram groove group is good.
Drawings
FIG. 1 is a schematic view of a trapezoidal groove with central symmetry;
FIG. 2 is a schematic view of an array arrangement of trapezoidal trenches;
FIG. 3 is a flow field velocity distribution of a centrosymmetric trapezoidal trench;
FIG. 4 shows the pressure distribution in the flow field of a centrosymmetric trapezoidal groove;
FIG. 5 shows the pressure distribution in the flow field with a parallel channel structure.
In the figure: 1. trapezoidal groove, 2. inverted trapezoidal groove.
Detailed Description
Examples
1. The bipolar plate is made of stainless steel sheet and the grooves are formed on the front and back of the stainless steel sheet by stamping process.
2. The polar plate proves that the flow field is provided with 3 groups of transverse parallelogram grooves and 3 groups of longitudinal parallelogram grooves which are arranged in a matrix form, and the longitudinal staggered distance is 4.5mm as shown in figure 2; an isosceles trapezoid groove with a waist length of 40mm, a short side of 1.5mm, a short side cross-sectional depth of 0.5mm, a long side of 4.5mm and a long side cross-sectional depth of 0.5 mm; the reverse flow field plane is a parallelogram groove with the short side of 1.5mm and the long side of 40 mm.
3. The sectional area of the trapezoid long-side channel is larger than that of the trapezoid short-side channel, the speed of fluid entering the sectional area of the trapezoid short-side channel is increased, the pressure is reduced, the speed of fluid entering the sectional area of the trapezoid long-side channel adjacent to the inverted trapezoid is smaller than that of the groove short-side channel adjacent to the inverted trapezoid, the pressure of the adjacent inverted trapezoid long-side channel is larger than that of the groove short-side channel adjacent to the inverted trapezoid, the fluid diffuses along the direction of pressure gradient through a diffusion layer under the ridge, continuous undercurrent is formed under the ridge, and the gathering of a product under the ridge or the short-material condition of a reactant.
4. The pressure values of the same length positions of the parallel channel structures are equal, namely the pressure of the cross sections of the channels corresponding to the adjacent grooves is equal, the pressure gradient is zero, the fluid of the diffusion layer under the ridge flows slowly, and products are easy to gather under the ridge to block the diffusion layer.
Claims (8)
1. A pole plate for improving the material distribution uniformity of a fuel cell is a double-sided flow field, the pole plate is formed by stamping a stainless steel flat plate, grooves which are sunken towards the inside of the plate surface are arranged on the front surface of the stainless steel plate, and ridges which are protruded towards the outside of the plate surface are arranged on the back surface corresponding to the grooves;
front side: the side edges of one inverted trapezoidal groove and the other trapezoidal groove from left to right are arranged at intervals by ridges to form a group of parallelogram groove groups, and more than two groups of parallelogram groove groups arranged at intervals from left to right form a row of flow field; the side edges of the adjacent inverted trapezoids and trapezoidal grooves are arranged at intervals by ridges, the ridges are in a parallelogram shape, and an upper plane and a lower plane are respectively arranged on all the inverted trapezoids and trapezoidal grooves; the front flow field is formed by arranging a row of flow fields or more than two rows of flow fields which are sequentially arranged from top to bottom and are separated by strip-shaped protrusions;
and (3) reverse side: one parallelogram groove and the other parallelogram groove are arranged from left to right at intervals to form a group of splayed groove groups, and more than two groups of splayed groove groups arranged from left to right at intervals form a column of flow field; the side edges of adjacent parallelogram grooves are arranged at intervals by inverted trapezoidal ridges or trapezoidal ridges, the ridges are inverted trapezoidal or trapezoidal, and all the parallelogram grooves are respectively provided with an upper plane and a lower plane;
the reverse flow field is formed by arranging a row of flow fields or more than two rows of flow fields which are sequentially arranged from top to bottom and are separated by the strip-shaped protrusions.
2. The dual-sided flow field of claim 1, wherein: the height of the long strip-shaped protrusion on the front surface or the back surface in the direction vertical to the plate surface is less than or equal to the height of the ridge.
3. The dual-sided flow field of claim 1, wherein: the trapezoidal grooves or ridges mean that the section parallel to the surface of the plate body is trapezoidal, and the parallelogram grooves or ridges mean that the section parallel to the surface of the plate body is parallelogram.
4. The dual-sided flow field of claim 1, wherein: the inverted trapezoidal grooves in one parallelogram groove group are centrosymmetric with the trapezoidal grooves.
5. The dual-sided flow field of claim 1, wherein: and on the front side, the ratio of the horizontal row spacing from left to right of the grooves to the height of the trapezoid from top to bottom is 0.001-0.1.
6. The dual-sided flow field of claim 1, wherein: the proportion of the sum of the planar areas of the grooves to the area of the front surface of the polar plate can be set to be 1/3-2/3.
7. The dual-sided flow field of claim 1, wherein: and the ratio of the depth of the upper bottom edge of the inverted trapezoid or trapezoid groove sunken into the board surface to the depth of the lower bottom edge sunken into the board surface can be set to be 1/10-1.
8. The dual-sided flow field of claim 1 or 7, wherein: the ratio of the width of the bottom surface of the groove from left to right to the width of the opening of the groove can be set to be 1/10-1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811479827.XA CN111276712B (en) | 2018-12-05 | 2018-12-05 | Double-sided flow field for polar plate for improving material distribution uniformity of fuel cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811479827.XA CN111276712B (en) | 2018-12-05 | 2018-12-05 | Double-sided flow field for polar plate for improving material distribution uniformity of fuel cell |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111276712A true CN111276712A (en) | 2020-06-12 |
| CN111276712B CN111276712B (en) | 2021-06-29 |
Family
ID=70998544
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811479827.XA Active CN111276712B (en) | 2018-12-05 | 2018-12-05 | Double-sided flow field for polar plate for improving material distribution uniformity of fuel cell |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111276712B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114695912A (en) * | 2022-06-01 | 2022-07-01 | 季华实验室 | Flow field runner, bipolar plate and proton exchange membrane fuel cell |
| CN115275269A (en) * | 2022-08-08 | 2022-11-01 | 大连理工大学 | Vein parallel flow field structure with gas distribution area and application of structure in fuel cell |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101093890A (en) * | 2006-06-21 | 2007-12-26 | 南亚电路板股份有限公司 | Wave type fluid channel plate in use for fuel cell |
| CN201655893U (en) * | 2010-04-09 | 2010-11-24 | 新源动力股份有限公司 | Bipolar plate of proton-exchange membrane fuel cell with gas flow field |
| CN102299343A (en) * | 2011-07-26 | 2011-12-28 | 武汉理工大学 | Leaf biomimetic structure based bipolar plate for proton exchange membrane fuel cells |
| CN107611457A (en) * | 2017-08-31 | 2018-01-19 | 上海汽车集团股份有限公司 | A kind of fuel cell and its minus plate |
| CN107810572A (en) * | 2015-07-03 | 2018-03-16 | 株式会社Lg化学 | Dividing plate, its manufacture method and the fuel cell pack including dividing plate |
| WO2018088701A1 (en) * | 2016-11-14 | 2018-05-17 | 주식회사 엘지화학 | Separation plate for fuel cell and fuel cell using same |
-
2018
- 2018-12-05 CN CN201811479827.XA patent/CN111276712B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101093890A (en) * | 2006-06-21 | 2007-12-26 | 南亚电路板股份有限公司 | Wave type fluid channel plate in use for fuel cell |
| CN201655893U (en) * | 2010-04-09 | 2010-11-24 | 新源动力股份有限公司 | Bipolar plate of proton-exchange membrane fuel cell with gas flow field |
| CN102299343A (en) * | 2011-07-26 | 2011-12-28 | 武汉理工大学 | Leaf biomimetic structure based bipolar plate for proton exchange membrane fuel cells |
| CN107810572A (en) * | 2015-07-03 | 2018-03-16 | 株式会社Lg化学 | Dividing plate, its manufacture method and the fuel cell pack including dividing plate |
| WO2018088701A1 (en) * | 2016-11-14 | 2018-05-17 | 주식회사 엘지화학 | Separation plate for fuel cell and fuel cell using same |
| CN107611457A (en) * | 2017-08-31 | 2018-01-19 | 上海汽车集团股份有限公司 | A kind of fuel cell and its minus plate |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114695912A (en) * | 2022-06-01 | 2022-07-01 | 季华实验室 | Flow field runner, bipolar plate and proton exchange membrane fuel cell |
| CN114695912B (en) * | 2022-06-01 | 2022-09-02 | 季华实验室 | Flow field runner, bipolar plate and proton exchange membrane fuel cell |
| CN115275269A (en) * | 2022-08-08 | 2022-11-01 | 大连理工大学 | Vein parallel flow field structure with gas distribution area and application of structure in fuel cell |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111276712B (en) | 2021-06-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101944618B (en) | Tree-structured flow field proton exchange membrane fuel cell bipolar plate | |
| CN112133938A (en) | Fuel cell flow field plate and fuel cell | |
| CN109065907A (en) | A kind of fuel battery polar plate flow field structure and fuel battery pole board | |
| CN102306805B (en) | PEMFC (proton exchange membrane fuel cell) metal bipolar plate conducive to improving fluid distribution | |
| CN111276712B (en) | Double-sided flow field for polar plate for improving material distribution uniformity of fuel cell | |
| CN108258261A (en) | A kind of variable cross-section fuel cell channel | |
| CN109904480A (en) | A kind of bipolar plates with new flow field structure | |
| CN109686995A (en) | A kind of interior bipolar plates with wedge-shaped protrusion of runner | |
| CN110474065A (en) | Fuel battery pole board, bipolar plates and hydrogen fuel cell | |
| CN112786913A (en) | Bipolar plate and fuel cell comprising same | |
| CN113555580A (en) | Polar plate for fuel cell pile | |
| CN112271307A (en) | Fish scale bionic fuel cell bipolar plate and fuel cell | |
| CN113097525A (en) | Bipolar plate and single cell comprising same | |
| CN112038659A (en) | Flow field plate suitable for fuel cell and fuel cell | |
| CN210006824U (en) | Bipolar plate flow field structure and bipolar plate in fuel cells | |
| CN109841864A (en) | A kind of dual polar plates of proton exchange membrane fuel cell three-dimensional flow field | |
| CN113571727B (en) | Flow field structure of bipolar plate of fuel cell | |
| CN106602100B (en) | Novel fuel cell flow field plate | |
| CN209374562U (en) | A kind of interior bipolar plates with wedge-shaped protrusion of runner | |
| CN219342320U (en) | Electrolytic water polar plate with tear-drop type array flow field | |
| CN210489736U (en) | Flow field structure of fuel cell | |
| CN110690488A (en) | Flow battery | |
| CN109546178B (en) | Intestinal flow field plate and fuel cell comprising same | |
| CN116445952A (en) | Gradient zoning lattice flow field structure of electrolytic tank | |
| US20220238894A1 (en) | Fuel cell |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |