CN114725422A - Bipolar plate structure of fuel cell - Google Patents

Bipolar plate structure of fuel cell Download PDF

Info

Publication number
CN114725422A
CN114725422A CN202210262316.2A CN202210262316A CN114725422A CN 114725422 A CN114725422 A CN 114725422A CN 202210262316 A CN202210262316 A CN 202210262316A CN 114725422 A CN114725422 A CN 114725422A
Authority
CN
China
Prior art keywords
flow channel
anode
cathode
fuel cell
hydrogen
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.)
Pending
Application number
CN202210262316.2A
Other languages
Chinese (zh)
Inventor
袁鹏
杨骄
高鹏然
陈宏�
张华农
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen Center Power Tech Co Ltd
Shenzhen Hydrogen Fuel Cell Technology Co Ltd
Original Assignee
Shenzhen Center Power Tech Co Ltd
Shenzhen Hydrogen Fuel Cell Technology Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Shenzhen Center Power Tech Co Ltd, Shenzhen Hydrogen Fuel Cell Technology Co Ltd filed Critical Shenzhen Center Power Tech Co Ltd
Priority to CN202210262316.2A priority Critical patent/CN114725422A/en
Publication of CN114725422A publication Critical patent/CN114725422A/en
Pending legal-status Critical Current

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
    • 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
    • H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
    • H01M8/0276—Sealing means characterised by their form
    • 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 provides a fuel cell bipolar plate structure, which comprises an anode plate and a cathode plate which are attached to each other; the middle part of the anode plate is provided with a plurality of anode concave parts, the middle part of the cathode plate is provided with a plurality of cathode concave parts, and the cross section area of the anode concave parts is smaller than that of the cathode concave parts; the cross section of the anode concave part and the cross section of the cathode concave part are both trapezoidal or wavy; the anode concave parts and the cathode concave parts are correspondingly connected one by one and surround to form a cooling water flow channel; a hydrogen flow channel is formed between two adjacent anode concave parts; an oxygen flow channel is formed between two adjacent cathode concave parts; the cross-sectional area of the hydrogen flow channel is smaller than that of the oxygen flow channel. The cross-sectional area that this application structure was through setting up the hydrogen runner is less than the cross-sectional area of oxygen runner, under the prerequisite of guaranteeing gaseous even circulation for electrochemical reaction is more abundant, the effectual performance that improves fuel cell.

Description

Bipolar plate structure of fuel cell
Technical Field
The invention relates to the technical field of fuel cells, in particular to a bipolar plate structure of a fuel cell.
Background
Hydrogen energy has many advantages such as cleanliness and high efficiency, and is receiving more and more attention and being commercially used in various technical fields. The polar plate plays a plurality of roles of distributing fuel gas, collecting current, supporting and the like in the hydrogen fuel cell, and is one of important components for determining the volume/weight power density, the service life and the like of the fuel cell.
At present, in the field of designing metal plates of fuel cells, some enterprises and scholars propose novel ideas. For example, chinese patent CN2019207979251 proposes a bipolar plate with a separator, which can greatly improve the uniformity of cooling water distribution; chinese patent application CN2018116115696 proposes a metal bipolar plate with better sealing performance, which can greatly improve the sealing performance of the plate. However, although the bipolar plates in the prior art have different structures, the flow channel structure of the anode plate and the flow channel structure of the cathode plate have the same size, so that the intake amounts of hydrogen and oxygen are the same, and it is difficult to simultaneously meet the requirements of the electrochemical reaction on the use amounts of oxygen and hydrogen. The requirements for the consumption of the required hydrogen and the required oxygen in the electrochemical reaction process are different, the electrochemical reaction of the bipolar plate is insufficient due to the same air input of the hydrogen and the oxygen, the utilization rate of the hydrogen and the oxygen is reduced, and the performance of the fuel cell is reduced.
Disclosure of Invention
Based on the structure, the invention provides a fuel cell bipolar plate structure, and aims to solve the problems that the size of a flow channel structure of an anode plate is the same as that of a flow channel structure of a cathode plate in the existing bipolar plate, so that the air inflow of hydrogen and oxygen is the same, the electrochemical reaction of the bipolar plate is insufficient, the utilization rate of the hydrogen and the oxygen is reduced, and the performance of a fuel cell is reduced.
In order to achieve the purpose, the invention provides the following technical scheme:
a fuel cell bipolar plate structure comprises an anode plate and a cathode plate which are attached to each other;
the middle part of the anode plate is provided with a plurality of anode concave parts; a plurality of cathode concave parts are arranged in the middle of the cathode plate, and the cross section area of the anode concave part is smaller than that of the cathode concave part; the cross section of the anode concave part and the cross section of the cathode concave part are both trapezoidal or wavy;
the anode concave parts and the cathode concave parts are correspondingly connected one by one and enclose to form cooling water flow channels; a hydrogen flow channel is formed between two adjacent anode concave parts; an oxygen flow channel is formed between two adjacent cathode concave parts; the cross-sectional area of the hydrogen flow passage is smaller than that of the oxygen flow passage.
Further, the adjacent anode recess and the hydrogen flow channel, the adjacent cathode recess and the oxygen flow channel form a concave-convex structure; the anode recess and the cathode recess are both recesses obtained by press molding.
Further, the width of the bottom of the hydrogen flow channel is equal to that of the bottom of the oxygen flow channel; the depth of the hydrogen flow channel is smaller than that of the oxygen flow channel.
Further, when both the cross section of the anode recess and the cross section of the cathode recess are trapezoidal, the ratio of the depth of the hydrogen flow channel to the depth of the oxygen flow channel is 1: (1.5-2).
Further, the depth of the hydrogen flow channel is 0.2mm-0.4 mm; the depth of the oxygen flow channel is 0.3mm-0.8 mm.
Further, when both the cross section of the anode recess and the cross section of the cathode recess are wavy, the ratio of the depth of the hydrogen flow channel to the depth of the oxygen flow channel is 1: 2.
further, the depth of the hydrogen flow channel is 0.25mm-0.45 mm; the depth of the oxygen flow channel is 0.5mm-0.9 mm.
Furthermore, an anode sealing groove is formed around the anode plate; and a cathode sealing groove corresponding to the anode sealing groove is arranged around the cathode plate.
Furthermore, the thickness of the anode plate and the cathode plate is 0.1mm-0.2 mm.
Furthermore, the anode plate and the cathode plate are both polar plates formed by punching or compression molding of metal base materials.
Further, the metal substrate is a stainless steel plate or a titanium plate.
According to the fuel cell bipolar plate structure provided by the invention, the anode concave parts and the cathode concave parts are arranged, so that the hydrogen flow channel is formed between the adjacent anode concave parts, the oxygen flow channel is formed between the adjacent cathode concave parts, and the concave-convex structures are formed on the adjacent anode concave parts and the hydrogen flow channel as well as the adjacent cathode concave parts and the oxygen flow channel, so that the bipolar plate of the application forms a two-plate three-field structure, and the performance of a fuel cell is effectively improved. The cross-sectional area of the hydrogen flow channel is smaller than that of the oxygen flow channel, so that the flow of the hydrogen on the bipolar plate and the flow of the oxygen meet the requirements on the oxygen and hydrogen consumption in the electrochemical reaction process, the electrochemical reaction is more sufficient on the premise of ensuring the uniform circulation of the gas, and the performance of the fuel cell is effectively improved. Compared with the conventional bipolar plate structure, the bipolar plate structure has the advantages of more sections and higher energy conversion efficiency.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a front view of a bipolar plate structure of a fuel cell according to embodiments 1 and 2 of the present invention;
fig. 2 is a front view of a bipolar plate structure of a fuel cell according to embodiments 3 and 4 of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, back, top and bottom … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between the embodiments may be combined with each other, but must be based on the realization of the technical solutions by a person skilled in the art, and when the technical solutions are contradictory to each other or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
In the existing metal bipolar plate, the size of the flow channel structure of the anode plate is the same as that of the flow channel structure of the cathode plate, so that the air inflow of hydrogen and oxygen is the same; in the electrochemical reaction process, the requirements on the consumption of the required hydrogen and the required oxygen are different, so that the electrochemical reaction of the bipolar plate is insufficient, the utilization rate of the hydrogen and the oxygen is reduced, and the performance of the fuel cell is reduced. In order to solve the technical problem, the invention provides a bipolar plate structure of a fuel cell.
In the present application, the performance of a fuel cell (stack) can be evaluated by voltage data corresponding to three densities of low, medium, and high in the polarization curve. In the examples of the present application, the low electric density is 0.6A/cm2The medium electric density is 1.4A/cm2The high electric density is 2.0A/cm2。
Example 1
As shown in fig. 1, a bipolar plate structure of a fuel cell according to an embodiment of the present invention includes an anode plate 1 and a cathode plate 2, which are attached to each other;
the middle part of the anode plate 1 is provided with a plurality of anode concave parts 11; a plurality of cathode concave parts 21 are arranged in the middle of the cathode plate 2, and the cross-sectional area of the anode concave part 11 is smaller than that of the cathode concave part 21; the cross-sectional shape of the anode recess 11 and the cross-sectional shape of the cathode recess 21 are both trapezoidal;
the anode concave parts 11 and the cathode concave parts 21 are correspondingly connected one by one and surround to form a cooling water flow channel 3; a hydrogen flow channel 4 is formed between two adjacent anode concave parts 11; an oxygen flow channel 5 is formed between two adjacent cathode concave parts 21; the cross-sectional area of the hydrogen flow channel 4 is smaller than the cross-sectional area of the oxygen flow channel 5.
It can be understood that, in the embodiment of the present application, the side of the anode plate 1 away from the cathode plate 2 and the side of the cathode plate 2 away from the anode plate 1 are respectively attached to the membrane electrode 6, so as to cover the top of the hydrogen flow channel 4 and the top of the oxygen flow channel 5, so that the hydrogen flow channel 4 and the oxygen flow channel 5 form a closed flow channel, and an inlet and an outlet are reserved at two ends of the flow channel. Therefore, the bipolar plate of the application forms a two-plate three-field structure, and the performance of the fuel cell is effectively improved.
In the present embodiment, the adjacent anode recess 11 and the hydrogen flow channel 4, the adjacent cathode recess 21 and the oxygen flow channel 5 each form a concave-convex structure; the anode recess 11 and the cathode recess 21 are both recesses obtained by press molding. Therefore, the bipolar plate of the application forms a two-plate three-field structure, and the performance of the fuel cell is effectively improved.
In the present embodiment, the width of the bottom of the hydrogen flow channel 4 is equal to the width of the bottom of the oxygen flow channel 5; the depth of the hydrogen flow channel 4 is smaller than that of the oxygen flow channel 5.
Specifically, the width of the bottom of the hydrogen flow channel 4 and the width of the bottom of the oxygen flow channel 5 are both 0.5mm, so that the bottom of the hydrogen flow channel 4 and the bottom of the oxygen flow channel 5 can completely correspond to each other, which is beneficial to electrochemical reaction; moreover, the distance between two adjacent hydrogen flow channels 4 and the distance between two adjacent oxygen flow channels 5 are both 1.5mm, so that the rate and the efficiency of the electrochemical reaction are further improved.
In the present embodiment, the ratio of the depth of the hydrogen flow channel 4 to the depth of the oxygen flow channel 5 is 1: 1.5.
specifically, the depth of the hydrogen flow channel 4 is 0.2 mm; the depth of the oxygen runner 5 is 0.3 mm. Therefore, the ratio of the cross-sectional area of the hydrogen runner 4 to the cross-sectional area of the oxygen runner 5 meets the requirements on the oxygen and hydrogen consumption in the electrochemical reaction process on the bipolar plate, the electrochemical reaction is more sufficient on the premise of ensuring the uniform circulation of gas, and the performance of the fuel cell is effectively improved.
In this embodiment, an anode sealing groove (not shown) is disposed around the anode plate 1; and a cathode sealing groove (not marked in the figure) corresponding to the anode sealing groove is arranged around the cathode plate 2. It can be understood that the anode sealing groove and the cathode sealing groove are used for dispensing and sealing, and the sealing performance of the anode plate 1 and the cathode plate 2 after being attached is ensured.
In the present embodiment, the thickness of the anode plate 1 and the cathode plate 2 is 0.1 mm.
In this embodiment, the anode plate 1 and the cathode plate 2 are both formed by pressing or molding a metal substrate.
In this embodiment, the metal substrate is a stainless steel plate or a titanium plate.
The performance test of the fuel cell shows that the cross-sectional area of the hydrogen flow channel is smaller than that of the oxygen flow channel, so that the flow of the hydrogen on the bipolar plate and the flow of the oxygen meet the requirements of the oxygen and the hydrogen in the electrochemical reaction process, the electrochemical reaction is more sufficient on the premise of ensuring the uniform circulation of the gas, the performance of the fuel cell is effectively improved, the structure is more energy-saving, and the energy conversion efficiency is higher. Specifically, in the present example, the density was 0.6A/cm for the polarization performance curve2When the average voltage of the fuel cell stack is 0.78V-0.81V, the electric density is 1.4A/cm2When the average voltage of the fuel cell stack is 0.71V-0.74V, the electric density is highIs 2.0A/cm2When the voltage is high, the average voltage of the fuel cell stack is 0.60V-0.62V.
Example 2
Example 2 differs from example 1 in that: the ratio of the depth of the hydrogen flow channel 4 to the depth of the oxygen flow channel 5 is 1: 2; specifically, the depth of the hydrogen flow channel 4 is 0.2 mm; the depth of the oxygen runner 5 is 0.4 mm; the thickness of the anode plate 1 and the cathode plate 2 is 0.2 mm; the width of the bottom of the hydrogen flow channel 4 and the width of the bottom of the oxygen flow channel 5 are both 0.6mm, and the distance between two adjacent hydrogen flow channels 4 and the distance between two adjacent oxygen flow channels 5 are both 1.8 mm.
The performance test of the fuel cell shows that the cross-sectional area of the hydrogen flow channel is smaller than that of the oxygen flow channel, so that the flow of the hydrogen on the bipolar plate and the flow of the oxygen meet the requirements of the oxygen and the hydrogen in the electrochemical reaction process, the electrochemical reaction is more sufficient on the premise of ensuring the uniform circulation of the gas, the performance of the fuel cell is effectively improved, the structure is more energy-saving, and the energy conversion efficiency is higher. Specifically, in the present example, the density was 0.6A/cm for the polarization performance curve2When the average voltage of the fuel cell stack is 0.77V-0.79V, the electric density is 1.4A/cm2When the fuel cell stack voltage is 0.71V-0.73V, the electric density is 2.0A/cm2When the voltage is high, the average voltage of the fuel cell stack is 0.59V-0.62V.
Example 3
As shown in fig. 2, embodiment 3 differs from embodiment 1 in that: the cross-sectional shape of the anode recess 11 and the cross-sectional shape of the cathode recess 21 are both wavy; the ratio of the depth of the hydrogen flow channel 4 to the depth of the oxygen flow channel 5 is 1: 2; the depth of the hydrogen flow channel 4 is 0.25 mm; the depth of the oxygen runner 5 is 0.5 mm; the thickness of the anode plate 1 and the cathode plate 2 is 0.2 mm.
Performance tests of the fuel cell show that the hydrogen gas flow channel in the embodiment has a smaller cross-sectional area than the oxygen gas flow channel, so that the hydrogen gas on the bipolar plate can be obtainedThe flow of the oxygen and the flow of the oxygen meet the requirements of the electrochemical reaction process on the use amount of the oxygen and the hydrogen, the electrochemical reaction is more sufficient on the premise of ensuring the uniform circulation of the gas, the performance of the fuel cell is effectively improved, the structure is more energy-saving, and the energy conversion efficiency is higher. Specifically, in the present example, the density was 0.6A/cm for the polarization performance curve2When the fuel cell stack voltage is 0.79V-0.82V, the electric density is 1.4A/cm2When the average voltage of the fuel cell stack is 0.72V-0.75V, the electric density is 2.0A/cm2When the average voltage of the fuel cell stack is 0.61V-0.65V.
Example 4
Example 4 differs from example 3 in that: the depth of the hydrogen flow channel 4 is 0.3 mm; the depth of the oxygen runner 5 is 0.6 mm; the width of the bottom of the hydrogen flow channel 4 and the width of the bottom of the oxygen flow channel 5 are both 0.6mm, and the distance between two adjacent hydrogen flow channels 4 and the distance between two adjacent oxygen flow channels 5 are both 1.8 mm.
The performance test of the fuel cell shows that the cross-sectional area of the hydrogen flow channel is smaller than that of the oxygen flow channel, so that the flow of the hydrogen on the bipolar plate and the flow of the oxygen meet the requirements of the oxygen and the hydrogen in the electrochemical reaction process, the electrochemical reaction is more sufficient on the premise of ensuring the uniform circulation of the gas, the performance of the fuel cell is effectively improved, the structure is more energy-saving, and the energy conversion efficiency is higher. Specifically, in the present example, the electric density was 0.6A/cm for the polarization performance curve2When the average voltage of the fuel cell stack is 0.78V-0.82V, the electric density is 1.4A/cm2When the average voltage of the fuel cell stack is 0.70V-0.75V, the electric density is 2.0A/cm2When the voltage is high, the average voltage of the fuel cell stack is 0.60V-0.62V.
Comparative example 1
The comparative example differs from example 1 in that: the ratio of the depth of the hydrogen flow channel 4 to the depth of the oxygen flow channel 5 is 1: 1; specifically, the depth of the hydrogen flow channel 4 is 0.2 mm; the depth of the oxygen runner 5 is 0.2 mm.
Through the performance test of the fuel cell, the ratio of the depth of the hydrogen flow channel 4 to the depth of the oxygen flow channel 5 in the present embodiment is 1: 1, the flow of hydrogen and oxygen on the bipolar plate does not meet the requirements of oxygen and hydrogen consumption in the electrochemical reaction process, the electrochemical reaction of the bipolar plate is insufficient, the utilization rate of hydrogen and oxygen is low, and the performance of the fuel cell is also low. Specifically, in the present example, the density was 0.6A/cm for the polarization performance curve2When the average voltage of the fuel cell stack is 0.72V-0.77V, the electric density is 1.4A/cm2When the fuel cell stack voltage is 0.64V-0.66V, the density is 2.0A/cm2When the voltage is high, the average voltage of the fuel cell stack is 0.54V-0.55V.
Comparative example 2
Comparative example 2 differs from example 3 in that: the ratio of the depth of the hydrogen flow channel 4 to the depth of the oxygen flow channel 5 is 1: 1; specifically, the depth of the hydrogen flow channel 4 is 0.3 mm; the depth of the oxygen runner 5 is 0.3 mm.
Through performance tests of the fuel cell, it is found that the ratio of the depth of the hydrogen flow channel 4 to the depth of the oxygen flow channel 5 in the present embodiment is 1: 1, the flow of hydrogen and oxygen on the bipolar plate does not meet the requirements of oxygen and hydrogen dosage in the electrochemical reaction process, the electrochemical reaction of the bipolar plate is insufficient, the utilization rate of hydrogen and oxygen is low, and the performance of the fuel cell is also low. Specifically, in the present example, the density was 0.6A/cm for the polarization performance curve2When the average voltage of the fuel cell stack is 0.74V-0.77V, the electric density is 1.4A/cm2When the fuel cell stack voltage is 0.69V-0.71V, the electric density is 2.0A/cm2When the voltage is higher than the predetermined value, the average voltage of the fuel cell stack is 0.58V-0.61V.
From the above experimental data, it can be seen that the average voltage of the fuel cell (stack) adopting the bipolar plate structure of the present application is higher than that of the fuel cell (stack) in the comparative example, regardless of the low, medium or high electrical density, which also indicates that the bipolar plate structure of the present application can make the electrochemical reaction of hydrogen and oxygen more sufficient, and effectively improve the performance of the fuel cell (stack).
According to the fuel cell bipolar plate structure provided by the invention, the anode concave parts 11 and the cathode concave parts 21 are arranged, so that the hydrogen flow channel 4 is formed between the adjacent anode concave parts 11, the oxygen flow channel 5 is formed between the adjacent cathode concave parts 21, and the adjacent anode concave parts 11 and the hydrogen flow channel 4, and the adjacent cathode concave parts 21 and the oxygen flow channel 5 form the concave-convex structure, so that the bipolar plate of the application forms a two-plate three-field structure, and the performance of a fuel cell is effectively improved. The cross-sectional area of the hydrogen flow channel 4 is smaller than that of the oxygen flow channel 5, so that the flow of hydrogen and the flow of oxygen on the bipolar plate meet the requirements on the amount of oxygen and hydrogen in the electrochemical reaction process, the electrochemical reaction is more sufficient on the premise of ensuring the uniform circulation of gas, and the performance of the fuel cell is effectively improved. Compared with the conventional bipolar plate structure, the bipolar plate structure has the advantages of more sections and higher energy conversion efficiency.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (10)

1. A fuel cell bipolar plate structure is characterized by comprising an anode plate and a cathode plate which are attached to each other;
the middle part of the anode plate is provided with a plurality of anode concave parts, the middle part of the cathode plate is provided with a plurality of cathode concave parts, and the cross section area of the anode concave parts is smaller than that of the cathode concave parts; the cross section of the anode concave part and the cross section of the cathode concave part are both trapezoidal or wavy;
the anode concave parts and the cathode concave parts are correspondingly connected one by one and enclose to form cooling water flow channels; a hydrogen flow channel is formed between two adjacent anode concave parts; an oxygen flow channel is formed between two adjacent cathode concave parts; the cross-sectional area of the hydrogen flow channel is smaller than that of the oxygen flow channel.
2. The fuel cell bipolar plate structure of claim 1 wherein said hydrogen flow channel bottom has a width equal to a width of said oxygen flow channel bottom; the depth of the hydrogen flow channel is smaller than that of the oxygen flow channel.
3. The fuel cell bipolar plate structure of claim 1, wherein when a cross section of said anode recess and a cross section of said cathode recess are both trapezoidal, a ratio of a depth of said hydrogen flow channel to a depth of said oxygen flow channel is 1: (1.5-2).
4. The fuel cell bipolar plate structure of claim 3 wherein said hydrogen gas flow channels have a depth of 0.2mm to 0.4 mm; the depth of the oxygen flow channel is 0.3mm-0.8 mm.
5. The fuel cell bipolar plate structure of claim 1, wherein when said anode recess cross-section and said cathode recess cross-section are both wavy, the ratio of the depth of said hydrogen flow channel to the depth of said oxygen flow channel is 1: 2.
6. the fuel cell bipolar plate structure of claim 5 wherein said hydrogen gas flow channels have a depth of 0.25mm to 0.45 mm; the depth of the oxygen flow channel is 0.5mm-0.9 mm.
7. The fuel cell bipolar plate structure of claim 1, wherein adjacent said anode recesses and said hydrogen gas flow channels, adjacent said cathode recesses and said oxygen gas flow channels each form a relief structure; the anode recess and the cathode recess are both recesses obtained by press molding.
8. The fuel cell bipolar plate structure of claim 1, wherein said anode plate and said cathode plate each have a thickness of 0.1mm to 0.2 mm.
9. The fuel cell bipolar plate structure of claim 1, wherein an anode seal groove is disposed around said anode plate; and a cathode sealing groove corresponding to the anode sealing groove is formed around the cathode plate.
10. The fuel cell bipolar plate structure of claim 1, wherein said anode plate and said cathode plate are both formed by stamping or molding a metal substrate;
the metal substrate is a stainless steel plate or a titanium plate.
CN202210262316.2A 2022-03-16 2022-03-16 Bipolar plate structure of fuel cell Pending CN114725422A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210262316.2A CN114725422A (en) 2022-03-16 2022-03-16 Bipolar plate structure of fuel cell

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210262316.2A CN114725422A (en) 2022-03-16 2022-03-16 Bipolar plate structure of fuel cell

Publications (1)

Publication Number Publication Date
CN114725422A true CN114725422A (en) 2022-07-08

Family

ID=82237309

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210262316.2A Pending CN114725422A (en) 2022-03-16 2022-03-16 Bipolar plate structure of fuel cell

Country Status (1)

Country Link
CN (1) CN114725422A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115207389A (en) * 2022-07-22 2022-10-18 中汽创智科技有限公司 Bipolar plate and fuel cell

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115207389A (en) * 2022-07-22 2022-10-18 中汽创智科技有限公司 Bipolar plate and fuel cell
CN115207389B (en) * 2022-07-22 2023-12-15 中汽创智科技有限公司 Bipolar plate and fuel cell

Similar Documents

Publication Publication Date Title
US6261711B1 (en) Sealing system for fuel cells
CN101312250B (en) Fuel cell
KR100949423B1 (en) Fuel Cell
CN108172857B (en) Fuel cell stack flow field plate supporting high-current-density discharge
JP5240282B2 (en) Fuel cell
EP2445046A1 (en) Fuel cell sealing structure
US7396609B2 (en) Fuel cell and metal separator for fuel cell
US9331344B2 (en) Fuel cell
US20090042075A1 (en) Fuel Cell Stack
CN114156500A (en) Bipolar plate and fuel cell stack
CN109473681B (en) Fuel cell bipolar plate with intermittent structure
JP2004152502A (en) Fuel cell stack
CN112838232B (en) Full-through-hole metal fiber sintered body fuel cell bipolar plate and fuel cell stack
CN111477901B (en) Fuel cell bipolar plate, single cell and fuel cell
JP2002184422A (en) Separator for fuel cell
CN107851824A (en) Fuel cell and fuel cell pack
CN111952652A (en) Air cooling fuel cell with elasticity and thermal-insulated end plate mechanism
CN112993312B (en) High-temperature methanol fuel cell stack with spaced cooling cavities
CN114361502A (en) Bionic proton exchange membrane fuel cell based on vein derivation
CN114725422A (en) Bipolar plate structure of fuel cell
US7572538B2 (en) Fuel cell
CN210866383U (en) Fuel cell
CN210576257U (en) Air cooling fuel cell with elasticity and thermal-insulated end plate mechanism
CN111952621A (en) Fuel cell stack and fuel cell vehicle
CN217544667U (en) Bipolar plate structure of 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