CN107026275B - Component for improving battery operation stability - Google Patents

Component for improving battery operation stability Download PDF

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Publication number
CN107026275B
CN107026275B CN201610071161.9A CN201610071161A CN107026275B CN 107026275 B CN107026275 B CN 107026275B CN 201610071161 A CN201610071161 A CN 201610071161A CN 107026275 B CN107026275 B CN 107026275B
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CN
China
Prior art keywords
diffusion layer
fuel cell
component
guide plate
flow guide
Prior art date
Application number
CN201610071161.9A
Other languages
Chinese (zh)
Other versions
CN107026275A (en
Inventor
董辉
Original Assignee
上海攀业氢能源科技有限公司
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Priority to CN201610071161.9A priority Critical patent/CN107026275B/en
Publication of CN107026275A publication Critical patent/CN107026275A/en
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Publication of CN107026275B publication Critical patent/CN107026275B/en

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Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00Fuel cells; Manufacture thereof
    • H01M8/04Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04082Arrangements for control of reactant parameters, e.g. pressure or concentration
    • H01M8/04089Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
    • H01M8/04119Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with simultaneous supply or evacuation of electrolyte; Humidifying or dehumidifying
    • H01M8/04126Humidifying
    • H01M8/04149Humidifying by diffusion, e.g. making use of membranes

Abstract

The invention relates to a component for improving the operation stability of a cell, which is used in the fuel cell, wherein the fuel cell comprises a flow guide plate, a gas diffusion layer and a membrane electrode, the gas diffusion layer comprises an air diffusion layer and a hydrogen diffusion layer, the component is made of a conductive material, is arranged between the flow guide plate and the air diffusion layer and is used for moisturizing a proton exchange membrane in the membrane electrode, and at least one through hole for introducing gas and liquid is arranged on the component. Compared with the prior art, the invention has the advantages of convenient use, low cost and the like.

Description

Component for improving battery operation stability

Technical Field

The invention belongs to the field of fuel cells, and particularly relates to a component for improving the operation stability of a cell.

Background

A fuel cell is an electrochemical device having the same composition as a general battery. The single cell is composed of a positive electrode and a negative electrode (a negative electrode, namely a fuel electrode, and a positive electrode, namely an oxidant electrode) and an electrolyte. Except that the active material of a general battery is stored inside the battery, and thus, the battery capacity is limited. The positive and negative electrodes of the fuel cell do not contain a reaction material, but are catalytic conversion elements. Fuel cells are thus well-known energy conversion machines that convert chemical energy into electrical energy. When the cell is operated, the fuel and the oxidant are supplied from the outside to react. In principle, the fuel cell can generate electricity continuously as long as reactants are continuously fed and reaction products are continuously discharged. The operating principle of the hydrogen-oxygen fuel cell is as follows:

negative electrode: h2→2H++2e-

And (3) positive electrode: 1/2O2+H++2e-→H2O

And (3) battery reaction: h2+1/2O2==H2O

Due to the characteristics of high specific energy, environmental friendliness, compatibility with renewable energy sources and the like, the fuel cell has received great attention from governments, enterprises and research groups all over the world. The developed countries in the united states, the daily and the european countries continuously strengthen the support for the fuel cell field, and the related technologies break through continuously, so that the proton membrane fuel cell for vehicles has already begun to be commercially used.

Because the proton exchange membrane of the fuel cell needs moisture when conducting hydrogen protons, the traditional fuel cell humidifies the air and the hydrogen before entering the fuel cell, so that the structure of the fuel cell system is complex and the reliability is reduced. For example, chinese patent application 201210559773.4 discloses a membrane humidifier for a fuel cell, comprising a cylindrical housing, a humidifying tube, an air baffle and a hydrogen baffle; the humidifying pipe is of a two-layer structure, the outer layer is an aramid fiber paper pipe, the inner layer is a stainless steel screen mesh, and two ends of the humidifying pipe are respectively fixed on an air baffle and a hydrogen baffle and are sealed with the inside of the cylindrical shell to form a pipe side and a shell side. The device has complex structure and is inconvenient to use.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a component which is convenient to use and low in cost and can improve the operation stability of a battery.

The purpose of the invention can be realized by the following technical scheme: the component for improving the operation stability of the cell is used in the fuel cell, the fuel cell comprises a flow guide plate, a gas diffusion layer and a membrane electrode, the gas diffusion layer comprises an air diffusion layer and a hydrogen diffusion layer, the component is made of a conductive material and is arranged between the flow guide plate and the air diffusion layer and used for moisturizing a proton exchange membrane in the membrane electrode, and at least one through hole for communicating gas and liquid is arranged on the component.

The conductive material is graphite paper.

The conductive material is a metal plate.

The thickness of the member is 0.01 to 2mm, and in this range, the appearance structure of the fuel cell to which the member is added is hardly changed.

The size of the component is matched with the size of the air diffusion layer.

The ratio of the area of the through holes to the area of the non-through holes on the component is 1: 1-1: 20, and in the ratio range, the component does not influence the power generation performance of the fuel cell, and can well moisturize the proton exchange membrane, so that the performance of the fuel cell is optimized.

Compared with the prior art, the invention has the following advantages:

(1) the invention is added outside the gas diffusion layer of the fuel cell, so that the moisture generated by the reaction can be kept inside the cell, the gas is prevented from being humidified by an additional humidifier, and the structure is simple;

(2) the ratio of the area of the through holes on the component to the area of the non-through holes on the component is 1: 1-1: 20, and in the ratio range, the component does not influence the power generation performance of the fuel cell, and can well moisturize the proton exchange membrane, so that the performance of the fuel cell is optimized;

(3) the thickness of the member of the present invention is 0.01 to 2mm, and in this range, the appearance structure of the fuel cell to which the member is added is hardly changed;

(4) the invention has low cost and convenient use, and is suitable for large-scale popularization and use.

Drawings

Fig. 1 is a schematic diagram of a fuel cell incorporating a component for improving the operational stability of the cell according to the present invention;

FIG. 2 is a graph of performance of a fuel cell incorporating a component of the present invention that improves the operational stability of the cell;

FIG. 3 is a performance curve of a fuel cell not incorporating the present invention;

the labels in the figure are: 1 membrane electrode, 2 air diffusion layers, 3 hydrogen diffusion layers, 4 parts, 5 air guide plates and 6 hydrogen guide plates.

Detailed Description

The invention is described in detail below with reference to the figures and specific embodiments.

Example 1

A part for improving the running stability of a cell is used in the fuel cell, the existing fuel cell is an air guide plate 5, an air diffusion layer 2, a membrane electrode 1, a hydrogen diffusion layer 3 and a hydrogen guide plate 6 which are sequentially arranged, a part 4 made of a conductive material is added between the air guide plate 5 and the air diffusion layer 2, as shown in figure 1, the part 4 is used for moisturizing a proton exchange membrane in the membrane electrode 1, and at least one through hole for ventilating liquid is arranged on the part 4. The member 4 of this example was graphite paper with a thickness of 0.01mm, and the dimensions of the member 4 were matched to those of the air diffusion layer 5. The ratio of the area of the through-holes to the area of the non-through-holes on the component 4 is 1: 1.

This example assembles a stack of 22 cells by stacking fuel cells in a stack of individual cells. The operating temperature of the cell stack was 62 degrees, and a fan was used for oxygen supply and heat dissipation. The results of the operation in which the component 4 of the present invention was added to the single cells of one stack and the other was not added are shown in fig. 2 and 3, in which fig. 2 is a performance curve of the fuel cell to which the component 4 of the present invention was added, and fig. 3 is a performance curve of the fuel cell to which the component 4 of the present invention was not added, and it can be seen from a comparison of fig. 2 and 3 that the performance of the cell was improved and the stable operation was enabled for a long period of time after the component 4 was added.

Example 2

In this example, the member 4 was a metal plate having a thickness of 2mm, and the ratio of the area of the through-holes in the member 4 to the area of the non-through-holes in the diffusion layer of the diffusion layer 4 was 1:20, as in example 1.

Example 3

In this example, the thickness of the member 4 was 0.5mm, and the ratio of the area of the through-holes in the member 4 to the area of the non-through-holes in the member 4 was 1:10, as in example 1.

Claims (3)

1. A part for improving the operation stability of a cell is used in the fuel cell, the fuel cell comprises a flow guide plate, a gas diffusion layer and a membrane electrode, the gas diffusion layer comprises an air diffusion layer and a hydrogen diffusion layer, the flow guide plate comprises an air flow guide plate and a hydrogen flow guide plate, and the part is made of graphite paper or a metal plate, is arranged between the air flow guide plate and the air diffusion layer and is used for moisturizing a proton exchange membrane in the membrane electrode, at least one through hole for introducing gas and liquid is arranged on the part, and the ratio of the area of the through hole to the area of a non-through hole on the part is 1: 1-1: 20.
2. The member for improving operational stability of a battery as claimed in claim 1, wherein the member has a thickness of 0.01 to 2 mm.
3. The member for improving operational stability of a battery as claimed in claim 1, wherein the size of the member is matched to the size of the air diffusion layer.
CN201610071161.9A 2016-02-01 2016-02-01 Component for improving battery operation stability CN107026275B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610071161.9A CN107026275B (en) 2016-02-01 2016-02-01 Component for improving battery operation stability

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610071161.9A CN107026275B (en) 2016-02-01 2016-02-01 Component for improving battery operation stability

Publications (2)

Publication Number Publication Date
CN107026275A CN107026275A (en) 2017-08-08
CN107026275B true CN107026275B (en) 2019-12-31

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CN (1) CN107026275B (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1063717A2 (en) * 1999-06-22 2000-12-27 SANYO ELECTRIC Co., Ltd. Stable and high-performance fuel cell
CN1684294A (en) * 2004-04-14 2005-10-19 上海神力科技有限公司 Self heat radiation and self wetting fuel cell stack with high power density
CN200965892Y (en) * 2006-07-07 2007-10-24 上海攀业氢能源科技有限公司 Fuel battery composite gas-diffusion-layer
CN101364646A (en) * 2007-08-08 2009-02-11 上海攀业氢能源科技有限公司 Fuel cell electrode having aqueous vapor separation layer
CN103531821A (en) * 2012-07-05 2014-01-22 清华大学 Membrane electrode and fuel cell using membrane electrode

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1063717A2 (en) * 1999-06-22 2000-12-27 SANYO ELECTRIC Co., Ltd. Stable and high-performance fuel cell
CN1684294A (en) * 2004-04-14 2005-10-19 上海神力科技有限公司 Self heat radiation and self wetting fuel cell stack with high power density
CN200965892Y (en) * 2006-07-07 2007-10-24 上海攀业氢能源科技有限公司 Fuel battery composite gas-diffusion-layer
CN101364646A (en) * 2007-08-08 2009-02-11 上海攀业氢能源科技有限公司 Fuel cell electrode having aqueous vapor separation layer
CN103531821A (en) * 2012-07-05 2014-01-22 清华大学 Membrane electrode and fuel cell using membrane electrode

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