阅读说明：本技术 一种提高水冷型质子膜燃料电池电堆内部热量分布一致性的方法 (Method for improving heat distribution consistency inside water-cooled proton membrane fuel cell stack ) 是由 林晨 王新磊 于 2020-12-23 设计创作，主要内容包括：本发明公开了一种提高水冷型质子膜燃料电池电堆内部热量分布一致性的方法,包括空气流道、冷却水流道以及氢气流道,空气流道和冷却水流道均为蛇形结构,冷却水与空气流场的排布方式为逆流排布,氢气流道为蛇形结构,氢气与空气流场的排布方式为逆流排布。该方法电堆内部不同膜电极间的温度差异最小,同时,膜电极面内的温度均匀性最好,即面内局部热点更少,电堆的温度一致性最好,预期寿命也更长。因此,可以通过空气和冷却水流场的逆流排布,来提高水冷型质子膜燃料电池电堆内部热量分布的一致性,延长电堆使用寿命。(The invention discloses a method for improving the heat distribution consistency inside a water-cooled proton membrane fuel cell stack, which comprises an air flow channel, a cooling water flow channel and a hydrogen flow channel, wherein the air flow channel and the cooling water flow channel are both of a serpentine structure, the arrangement mode of cooling water and an air flow field is counter-current arrangement, the hydrogen flow channel is of a serpentine structure, and the arrangement mode of hydrogen and the air flow field is counter-current arrangement. According to the method, the temperature difference between different membrane electrodes in the galvanic pile is minimum, meanwhile, the temperature uniformity in the membrane electrode surface is best, namely local hot spots in the surface are fewer, the temperature consistency of the galvanic pile is best, and the expected life is longer. Therefore, the uniformity of heat distribution in the water-cooling proton membrane fuel cell stack can be improved through the countercurrent arrangement of the air and the cooling water flow field, and the service life of the stack is prolonged.)

1. A method for improving the heat distribution consistency in a water-cooled proton membrane fuel cell stack comprises an air flow channel, a cooling water flow channel and a hydrogen flow channel, and is characterized in that: the air flow channel and the cooling water flow channel are both of serpentine structures.

2. The method for improving the uniformity of heat distribution inside a water-cooled proton membrane fuel cell stack as claimed in claim 1, wherein: the arrangement mode of the cooling water and the air flow field is counter-current arrangement.

3. The method for improving the uniformity of heat distribution inside a water-cooled proton membrane fuel cell stack as claimed in claim 1, wherein: the hydrogen flow channel is of a serpentine structure.

4. A method of improving the uniformity of heat distribution within a water-cooled proton membrane fuel cell stack as claimed in any one of claims 1 to 3, wherein: the arrangement mode of the hydrogen and air flow fields is counter-current arrangement.

5. The method for improving the uniformity of heat distribution inside a water-cooled proton membrane fuel cell stack as claimed in claim 1, wherein: the width of the cooling water flow channel and the width of the air flow channel are 1mm, the depth of the cooling water flow channel and the depth of the air flow channel are 1mm, and the width of the flow ridge is 1 mm.

6. The method for improving the uniformity of heat distribution inside a water-cooled proton membrane fuel cell stack as claimed in claim 1, wherein: the cooling water flow passage and the air flow passage are both provided with 14 turning areas.

7. The method for improving the uniformity of heat distribution inside a water-cooled proton membrane fuel cell stack as claimed in claim 6, wherein: the turning areas are all right angles.

8. The method for improving the uniformity of heat distribution inside a water-cooled proton membrane fuel cell stack as claimed in claim 1, wherein: and the hydrogen flow channel, the air flow channel and the cooling water flow channel are respectively provided with only one inlet and one outlet and are respectively positioned at two sides of the fuel cell stack.

9. The method for improving the uniformity of heat distribution inside a water-cooled proton membrane fuel cell stack as claimed in claim 1, wherein: the layout of the proton membrane fuel cell flow field is a 50mm by 49cm rectangle.

10. The method for improving the uniformity of heat distribution inside a water-cooled proton membrane fuel cell stack as claimed in claim 1, wherein: the proton membrane fuel cell stack consists of 5 single cells.

Technical Field

The invention relates to the technical field of hydrogen fuel cells, in particular to a method for improving the internal heat distribution consistency of a water-cooled proton membrane fuel cell stack.

Background

The consistency of the heat distribution inside the water-cooled proton membrane fuel cell stack is crucial to the performance and the service life of the stack, especially for high-power stacks. The high-power electric pile generally consists of dozens of membrane electrodes or even hundreds of membrane electrodes, and if obvious hot spots occur in the electric pile, the operation of the electric pile can be influenced to a great extent, so that the performance and the service life of the electric pile are reduced. By optimizing the arrangement mode between the air flow field and the cooling water flow field, the consistency of heat distribution in the galvanic pile can be effectively improved, so that the high-efficiency and long-life operation of the galvanic pile is effectively ensured.

Disclosure of Invention

The invention aims to solve the technical problems in the prior art, and provides a method for improving the uniformity of heat distribution in a water-cooled proton membrane fuel cell stack, which aims to solve the problem that different membrane electrodes have larger temperature difference, avoid hot spots on the electrode surfaces of the membranes and improve the uniformity of heat distribution in the stack.

In order to realize the purpose of the invention, the technical scheme adopted by the invention is as follows:

a method for improving the heat distribution consistency in a water-cooled proton membrane fuel cell stack comprises an air flow channel, a cooling water flow channel and a hydrogen flow channel, wherein the air flow channel and the cooling water flow channel are of serpentine structures.

The arrangement mode of the cooling water and the air flow field is counter-current arrangement.

The hydrogen flow channel is of a serpentine structure.

The arrangement mode of the hydrogen and air flow fields is counter-current arrangement.

The width of the cooling water flow channel and the width of the air flow channel are 1mm, the depth of the cooling water flow channel and the depth of the air flow channel are 1mm, and the width of the flow ridge is 1 mm.

The cooling water flow passage and the air flow passage are both provided with 14 turning areas.

The turning areas are all right angles.

And the hydrogen flow channel, the air flow channel and the cooling water flow channel are respectively provided with only one inlet and one outlet and are respectively positioned at two sides of the fuel cell stack.

The layout of the proton membrane fuel cell flow field is a 50mm by 49cm rectangle.

The proton membrane fuel cell stack consists of 5 single cells.

Compared with the prior art, the invention has the beneficial effects that:

compared with other flow field arrangement modes, such as cooling water and air concurrent flow, cooling water and air cross flow and the like, in the invention, the cooling water and air flow field counter-flow arrangement can effectively enable the heat distribution in the galvanic pile to be more uniform, and the highest temperature of the galvanic pile is reduced, so that the generation of hot spots is prevented, the dehydration of a proton exchange membrane is avoided, and the high efficiency and long service life operation of the galvanic pile is ensured.

Drawings

FIG. 1 is a flow field arrangement of examples versus comparative examples 1 and 2;

fig. 2 is an average temperature of the cathode catalytic layers of the example and comparative examples 1 and 2;

fig. 3 is a maximum temperature difference of the cathode catalytic layers of the example and comparative examples 1 and 2.

Detailed Description

The following detailed description of the embodiments of the present invention will be provided to facilitate better understanding of the technical solutions by the related art through the description of the embodiments with reference to the accompanying drawings

Comparative examples 1 and 2

The comparative example is other different flow field arrangement modes, the comparative example 1 is that the cooling water and the air flow field flow downstream, and the comparative example 2 is that the cooling water and the air flow field cross flow. Comparative examples 1 and 2 are comparative examples of examples, and the corresponding flow fields are shown in fig. 1.

Examples

The embodiment is that cooling water and an air flow field are arranged in a countercurrent mode, and the uniformity of heat distribution in the electric pile is improved. The flow field arrangement of the embodiment is as shown in fig. 1, the air flow field and the cooling water flow field are arranged in a counter-current manner, the air inlet and the cooling water outlet are on the same side, and the air outlet and the cooling water inlet are on the other side. The hydrogen and air flow field structure is the same, but the flow direction is opposite, namely the flow fields are arranged in a counter-current mode. The 3 flow field arrangements of the example and comparative examples 1 and 2 were compared for stack temperature distribution under the same experimental operating conditions as shown in table 1 below. The results of the examples and comparative examples 1 and 2 are shown in fig. 2 and 3.

TABLE 1

As can be seen from fig. 2, the temperature distribution of different membrane electrodes inside the stack is: the temperature of the middle film electrode of the galvanic pile is high, and the temperature of the two sides is low. Compared with comparative example 1 and comparative example 2, the average temperature of each cathode catalyst layer in the examples is significantly higher, but the average temperature difference between different cathode catalyst layers in the examples is smaller, i.e., the temperature distribution between different membrane electrodes in the examples is more uniform. As can be seen from fig. 3, compared with comparative example 1 and comparative example 2, in the examples, the heat distribution on each membrane electrode in the stack is more uniform, so that the examples can not only improve the uniformity of temperature distribution, but also effectively prevent hot spots from being generated, and avoid the dehydration of the proton exchange membrane, thereby ensuring the high-efficiency and long-life operation of the stack.

The invention is described above with reference to the accompanying drawings, it is obvious that the specific implementation of the invention is not limited by the above-mentioned manner, and it is within the scope of the invention to adopt various insubstantial modifications of the inventive concept and solution, or to apply the inventive concept and solution directly to other applications without modification.