CN211428275U

CN211428275U - Fuel cell bipolar plate with grooved ridge

Info

Publication number: CN211428275U
Application number: CN202020221149.3U
Authority: CN
Inventors: 夏忠贤; 陈士忠; 罗鑫; 袁伟; 张婷
Original assignee: Shenyang Jianzhu University
Current assignee: Shenyang Jianzhu University
Priority date: 2020-02-27
Filing date: 2020-02-27
Publication date: 2020-09-04
Anticipated expiration: 2030-02-27

Abstract

The utility model provides a grooved fuel cell bipolar plate of spine, belongs to the fuel cell field, including bipolar plate (2), be equipped with gas inlet (3), gas outlet (7) on bipolar plate (2), communicate through runner (4) between gas inlet (3), gas outlet (7), be equipped with spine (5) between runner (4), spine (5) are last to have seted up spine groove (6). Be equipped with the ridge between this fuel cell bipolar plate runner, seted up the ridge groove on the ridge, prevent because of the electrochemical reaction that reactant gas distributes the inhomogeneous and cause is inhomogeneous, lead to the too high scheduling problem of battery local temperature, improve fuel cell life.

Description

Fuel cell bipolar plate with grooved ridge

Technical Field

The utility model belongs to the fuel cell field, concretely relates to grooved fuel cell bipolar plate of spine.

Background

A fuel cell is a power generation device that directly converts chemical energy in a fuel and an oxidant into electric energy through an electrochemical reaction, and is widely used because it has advantages of high energy conversion efficiency, no pollution, low operation noise, high reliability, and the like. As one of the important components of a fuel cell, bipolar plates account for about 60% to 80% of the total weight of the cell, and 30% to 50% of the total cost. Therefore, the design of the bipolar plate has a significant impact on the output performance and cost of the fuel cell.

The role of bipolar plates in fuel cells is mainly reflected in two aspects: on the one hand, the fuel and the oxidant are provided for the electrochemical reaction of the whole cell, and unreacted gas and reaction products (mainly water) are discharged; another aspect is to collect the current generated by the electrochemical reaction. The existing fuel cell bipolar plate has the common problems that the gas participating in the reaction is not uniformly distributed in the flow channel, the water generated by the reaction is difficult to discharge to cause 'water logging', the catalyst is not fully utilized due to the nonuniform distribution of the gas in the flow channel, the electrochemical reaction is nonuniform, the local high temperature is caused, the service life of the fuel cell is shortened, and the like.

Disclosure of Invention

In order to solve the problem, the utility model provides a grooved fuel cell bipolar plate of ridge is equipped with the ridge between this fuel cell bipolar plate runner, has seted up the ridge groove on the ridge, prevents because of the electrochemical reaction that the reactant gas distributes unevenly to cause is inhomogeneous, leads to the too high scheduling problem of battery local temperature, improves fuel cell life.

The utility model adopts the following technical scheme:

a fuel cell bipolar plate with grooves on ridges comprises a bipolar plate, wherein a gas inlet and a gas outlet are arranged on the bipolar plate, the gas inlet and the gas outlet are communicated through flow channels, the ridges are arranged between the flow channels, and the ridges are provided with the grooves on the ridges.

Furthermore, the corners of the flow channel and the ridge are both designed to be arc-shaped, and the radius of the fillet is 0.2 mm.

Further, the width values of the flow channel and the ridge are set to be the same, and the width values are set to be 1 mm.

Further, the depth values of the flow channel and the ridge are set to be the same, and the depth values are set to be 1 mm.

Further, the value range of an included angle theta between the ridge groove and the gas inlet direction is set to be 0-180 degrees.

Further, the value range of the ridge-groove width d is set to be 0.1mm-1 mm.

Furthermore, the value range of the depth value h of the ridge groove is set to be 0.1mm-1 mm.

Further, the depth value h of the ridge groove is not larger than the depth values of the flow channel and the ridge.

Further, the ridge-groove width d is not larger than the width values of the flow channel and the ridge.

Further, the distance between the adjacent ridge and groove is a, wherein the distance a is smaller than the ridge length A.

The utility model discloses an advantage and beneficial effect do:

1. the utility model discloses a fuel cell bipolar plate with a grooved ridge, the flow channel structure is simple and reasonable, the reaction gas can be ensured to be evenly distributed in the flow channel when in use, and the use efficiency of the catalyst is improved;

2. in the fuel cell bipolar plate with the grooved ridge, the ridge and the flow channel are both arranged in the shape of a circular arc at the corner, so that the accumulation of product water at the corner can be reduced, and the stress concentration and crushing of the porous medium layer caused by sharp right angles can be avoided;

3. the utility model discloses a back slotted fuel cell bipolar plate, back slotted can prevent that the electrochemical reaction that causes because of reactant gas distributes unevenly is inhomogeneous, leads to the too high scheduling problem of battery local temperature, improves fuel cell life;

4. the utility model discloses a grooved fuel cell bipolar plate of spine, the water content in the gas diffusion layer under the spine can be reduced in the grooving of spine, improves reactant gas and reachs the vertical diffusion ability of catalysis layer through gas diffusion layer, reduces concentration polarization.

5. The utility model discloses a grooved fuel cell bipolar plate of spine, the pressure drop of the gaseous access & exit of runner can be reduced to the fluting of spine, reduces the power of circulating pump, improves fuel cell's net power.

Drawings

Fig. 1 is a schematic plane structure diagram of a fuel cell bipolar plate with a grooved ridge back applied in a single serpentine flow field according to the present invention;

fig. 2 is a schematic diagram of a three-dimensional structure of a back-grooved fuel cell bipolar plate applied in a single serpentine flow field according to the present invention;

fig. 3 is a comparison graph of the polarization curve and the power curve of a fuel cell bipolar plate with a back groove applied in a single serpentine flow field according to the present invention and a conventional single serpentine flow channel;

fig. 4 is a schematic diagram of a three-dimensional structure of a fuel cell bipolar plate with a grooved ridge back applied in an interdigitated flow field according to the present invention;

fig. 5 is a schematic diagram of a three-dimensional structure of a fuel cell bipolar plate with grooves on the back of its ridge applied in a parallel flow field.

In the figure: 1 is a bolt hole, 2 is a bipolar plate, 3 is a gas inlet, 4 is a flow channel, 5 is a ridge, 6 is a ridge groove, and 7 is a gas outlet.

Detailed Description

The present invention will be further explained with reference to the drawings and the embodiments.

The utility model relates to a bipolar plate suitable for fuel cell, concretely relates to grooved fuel cell bipolar plate technique of back of the body. The following description will be made by taking a single serpentine flow field as an example. The single-snake-shaped bipolar plate comprises a bolt hole 1, a bipolar plate 2, a gas inlet 3, a flow channel 4, a ridge 5, a ridge groove 6 and a gas outlet 7. The left upper part of the bipolar plate 2 is provided with a gas inlet 3, the right lower part of the bipolar plate 2 is provided with a gas outlet 7, the gas inlet 3 and the gas outlet 7 are respectively connected with two ends of a flow passage 4, a ridge 5 is arranged between the flow passages 4, and a ridge groove 6 is arranged on the ridge 5.

Example 1

The utility model relates to a grooved fuel cell bipolar plate of spine to it uses as an example in single snakelike flow field, at the during operation, lets in reactant gas by gas inlet 3, and gas removes and spreads along runner 4 and spine groove 6, and the gas that does not participate in the reaction and the water that the reaction generated are located to discharge in gas outlet 7. The ridges 5 in the bipolar plate 2 are ridges, wherein the main function of the ridges 5 is mechanical support, gas isolation, electron conduction, heat dissipation, etc.

When assembling and testing the fuel cell unit, the bolt tightening sequence should be operated according to the following regulations: the bolt holes of L1 and L5 are pre-screwed, in order to ensure that the bolt holes cannot be screwed down at a time under balanced stress, the bolt holes are sequentially provided with L3 and L7, L2 and L6, and L4 and L8, and after the pre-screwing is completed for the first time, the bolt holes are continuously screwed down to a preset screwing value according to the first screwing sequence.

The utility model discloses a back fluting relates to still can be applied to other flow field conditions such as interdigital flow field, parallel flow field.

Claims

1. The utility model provides a grooved fuel cell bipolar plate of spine, includes bipolar plate (2), be equipped with gas inlet (3), gas outlet (7) on bipolar plate (2), communicate its characterized in that through runner (4) between gas inlet (3), gas outlet (7): be equipped with back (5) between runner (4), back (5) are last to be seted up spine groove (6).

2. The bipolar plate of claim 1, wherein: the corners of the flow channel (4) and the ridge (5) are both designed to be arc-shaped, and the radius of the fillet is 0.2 mm.

3. The bipolar plate of claim 1, wherein: the width values of the flow channel (4) and the ridge (5) are set to be the same, and the width values are set to be 1 mm.

4. The bipolar plate of claim 1, wherein: the depth values of the flow channel (4) and the ridge (5) are set to be the same, and the depth values are set to be 1 mm.

5. The bipolar plate of claim 1, wherein: the included angle theta between the ridge groove (6) and the gas inlet direction is set to be 0-180 degrees.

6. The bipolar plate of claim 1, wherein: the width d of the ridge groove (6) is set to be 0.1mm-1 mm.

7. The bipolar plate of claim 1, wherein: the depth value h of the ridge groove (6) is set to be 0.1mm-1 mm.

8. The bipolar plate of claim 1, wherein: the depth value h of the ridge groove (6) is not more than the depth values of the flow channel (4) and the ridge (5).

9. The bipolar plate of claim 1, wherein: the width d of the ridge groove (6) is not more than the width values of the flow channel (4) and the ridge (5).

10. The bipolar plate of claim 1, wherein: the distance between the adjacent ridge grooves (6) is a, wherein the distance a is smaller than the length A of the ridge (5).