Fuel cell bipolar plate structure with pyramid-like lattice gas distribution area structure

Abstract

The utility model relates to the field of fuel cell bipolar plate structures, and discloses a fuel cell bipolar plate structure with a pyramid-like lattice gas distribution area structure, which comprises a bipolar plate main body, the bipolar plate main body comprises a flow channel and gas distribution areas, and the gas distribution areas are arranged on two sides of the flow channel. And a plurality of convex blocks are fixedly arranged on the inner wall of the flow channel of the gas distribution area. The structure of the gas distributor improves the redistribution capability and the mass transfer capability of gas.

Description

Technical Field

[0001] This utility model relates to the field of fuel cell bipolar plate structures, specifically a fuel cell bipolar plate structure with a pyramid-like lattice gas distribution region structure. Background Technology

[0002] A fuel cell is a power generation device that directly converts the chemical energy present in fuel and oxidant into electrical energy. It mainly consists of three parts: a membrane electrode assembly (formed by hot pressing a diffusion layer, catalyst, and proton exchange membrane), bipolar plates, and sealing materials. Together, the membrane electrode assembly and the bipolar plates on either side form a "generator" with positive and negative electrodes and an electrolyte. When the "generator" operates, fuel and air (oxidant) are fed into the fuel cell from the outside and react inside, generating electrons. Reactants are continuously input, and reaction products are continuously produced. The continuously generated electrons enter the external circuit and supply power to external electrical appliances, thus enabling the fuel cell to continuously generate electricity.

[0003] However, in existing bipolar plate structures, the accumulation of gas at the inlet of the flow field leads to insufficient gas supply on both sides of the flow channel, which reduces the gas transport efficiency and causes incomplete reaction. Utility Model Content

[0004] The purpose of this invention is to provide a bipolar plate structure for a fuel cell with a pyramid-like lattice gas distribution region structure, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a bipolar plate structure for a fuel cell with a pyramid-like lattice gas distribution area structure, comprising a bipolar plate body, wherein the bipolar plate body includes a flow channel and a gas distribution area, and the gas distribution area is disposed on both sides of the flow channel, wherein a plurality of protrusions are fixedly disposed on the inner wall of the flow channel of the gas distribution area.

[0006] Preferably, several of the bumps are evenly distributed along the gas distribution area.

[0007] Preferably, each of the protrusions is fixedly connected to the inner wall of the flow channel.

[0008] Preferably, the draft angle of each of the protrusions is 30°.

[0009] Compared with the prior art, the advantages of this utility model are as follows:

[0010] This invention features pyramid-shaped lattice-distributed protrusions in the gas distribution area, which improves the secondary distribution of gas in the flow channel and enhances mass transfer capacity. Driven by the inlet pressure, the gas is transported through the flow channel via convection. The uniformity of velocity distribution implies uniform pressure distribution. By secondary distributing the gas entering the flow channel, the gas is evenly distributed, improving the uniformity of the gas in the flow channel and reducing pressure drop. Through the redistribution of gas in the pyramid-shaped lattice-distributed gas distribution area, more gas is stored and transported to the flow channels on both sides. After entering the flow field, the gas is driven by pressure to flow towards the low-pressure area in the pyramid-shaped lattice-distributed gas distribution area, thereby filling the entire distribution area before entering the flow channel. This achieves uniform distribution of gas to each sub-flow channel, improving gas transport efficiency, effectively alleviating the problem of insufficient gas supply on both sides of the flow channel, and mitigating the problem of incomplete reaction caused by gas accumulation at the flow field inlet. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model;

[0012] Figure 2 This is an enlarged schematic diagram of the structure at point A of this utility model.

[0013] In the diagram: 1. Bipolar plate body; 2. Flow channel; 3. Gas distribution area; 4. Bump. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Example 1

[0016] Please see Figures 1-2 The diagram shows a bipolar plate structure for a fuel cell with a pyramid-like lattice gas distribution area structure. It includes a bipolar plate body 1, which includes a flow channel 2 and a gas distribution area 3. The gas distribution area 3 is located on both sides of the flow channel 2, and several protrusions 4 are fixedly arranged on the inner wall of the flow channel 2 of the gas distribution area 3.

[0017] In this embodiment, several protrusions 4 are evenly distributed along the gas distribution area 3, each protrusion 4 is fixedly connected to the inner wall of the flow channel 2, and the draft angle of each protrusion 4 is 30°.

[0018] Furthermore, pyramid-shaped lattice-distributed protrusions 4 are provided in the gas distribution zone 3, which can improve the secondary distribution of gas in the flow channel 2 and enhance mass transfer capacity. Driven by the inlet pressure, the gas is transported in the flow channel 2 through convection. The uniformity of velocity distribution means the uniformity of pressure distribution. By performing secondary distribution of the gas entering the flow channel 2, the gas is evenly distributed in the flow channel 2, improving the uniformity of the gas in the flow channel 2 and reducing the pressure drop. Through the gas redistribution in the pyramid-shaped lattice-distributed gas distribution zone 3, more gas is stored and transported to the two sides of the flow channel 2. After entering the flow field, the gas is driven by pressure to flow towards the low-pressure area in the pyramid-shaped lattice-distributed gas distribution zone 3, thereby filling the entire distribution zone before entering the flow channel 2. This achieves uniform distribution of gas to each sub-flow channel, improves the gas transport efficiency, effectively alleviates the problem of insufficient gas supply on both sides of the flow channel 2, and alleviates the problem of incomplete reaction caused by gas accumulation at the inlet of the flow field.

[0019] The working principle of this invention is as follows: A pyramid-shaped lattice of protrusions 4 is provided in the gas distribution area 3, which improves the secondary distribution of gas in the flow channel 2 and enhances mass transfer capacity. Driven by the inlet pressure, the gas is transported in the flow channel 2 via convection. The uniformity of velocity distribution implies uniform pressure distribution. By performing secondary distribution of the gas entering the flow channel 2, the gas is evenly distributed in the flow channel 2, improving the uniformity of the gas in the flow channel 2 and reducing pressure drop. Through the redistribution of gas in the pyramid-shaped lattice gas distribution area 3, more gas is stored and transported to both sides of the flow channel 2. After entering the flow field, the gas is driven by pressure to flow towards the low-pressure area in the pyramid-shaped lattice gas distribution area 3, thus filling the entire distribution area before entering the flow channel 2. This achieves uniform distribution of gas to each sub-flow channel, improving gas transport efficiency, effectively alleviating the problem of insufficient gas supply on both sides of the flow channel 2, and mitigating the problem of incomplete reaction caused by gas accumulation at the flow field inlet.

[0020] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0021] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A bipolar plate structure for a fuel cell with a pyramid-like lattice gas distribution region, comprising a bipolar plate body (1), characterized in that: The bipolar plate body (1) includes a flow channel (2) and a gas distribution area (3), and the gas distribution area (3) is arranged on both sides of the flow channel (2). Several protrusions (4) are fixedly arranged on the inner wall of the flow channel (2) of the gas distribution area (3).

2. A fuel cell bipolar plate structure having a pyramidal-like lattice gas distribution region structure according to claim 1, characterized by: Several of the bumps (4) are evenly distributed along the gas distribution area (3).

3. A fuel cell bipolar plate structure having a pyramidal-like lattice gas distribution region structure according to claim 2, characterized by: Each of the protrusions (4) is fixedly connected to the inner wall of the channel (2).

4. A fuel cell bipolar plate structure having a pyramid-like lattice gas distribution region structure according to claim 3, characterized by: The draft angle of each of the protrusions (4) is 30°.

Images