CN206194865U - Fuel cell bipolar plate in web frame flow field - Google Patents

Abstract

The utility model relates to a fuel cell bipolar plate with a mesh structure flow field, which comprises a flow channel inlet, a sealing ring, a bipolar plate, positioning pin holes, a flow field area, an annular flow channel, a radial flow channel and a flow channel outlet. Its network structure flow field has a left-right symmetrical structure, consisting of radial flow channels and annular flow channels, which are arranged compactly and evenly, making full use of the reaction area, which can improve the flow state of the reaction fuel and liquid water in the flow channel, and overcome the common serpentine flow channel The disadvantage of large pressure drop. The utility model adopts a network structure flow field, so that the reaction fuel can fully perform the electrochemical reaction to produce capacity, which not only improves the reaction efficiency of the hydrogen-oxygen fuel, but also increases the stability of the fuel cell, and has a reasonable and compact structure and safe operation.

Description

A fuel cell bipolar plate with mesh structure flow field

technical field

The utility model relates to the field of proton exchange membrane fuel cells, in particular to a fuel cell bipolar plate with a net structure flow field.

Background technique

As a green device that can directly convert chemical energy in fuel into electrical energy, fuel cells have the advantages of high efficiency, high specific energy and low pollution, and are considered to be one of the important new energy sources to replace fossil energy in the future. Among them, the bipolar plate is one of the crucial components in the fuel cell, which plays the roles of current collection, gas fuel distribution, water and heat management, and strength support. In fact, the energy efficiency of a fuel cell largely depends on the structure of the flow channel of the bipolar plate. A high-quality flow channel structure can improve the flow state of reactants and products, so that the reactants can be obtained everywhere in the electrode, and the cooling water can be removed in time to improve the power generation efficiency of the fuel cell.

Common fuel cell bipolar plate flow fields include parallel flow field, serpentine flow field and interdigitated flow field. Although the pressure drop of the parallel flow field is low, it is prone to uneven distribution of fuel in the flow channel, which causes the problem of cooling water accumulation. The serpentine flow field has the advantage of strong drainage capacity, but the pressure drop is relatively large. The interdigitated flow field can promote the forced convection of fuel in the flow channel, but the problem of liquid water stagnation at the beginning of the flow channel will be caused by insufficient pressure drop.

After literature search, authorized publication number: CN204333116U, named as a proton exchange membrane fuel cell bipolar plate with a helical flow field. The utility model provides a proton exchange membrane fuel cell bipolar plate with a spiral structure flow field. The center of the channel is symmetrically distributed. The utility model has the advantage that the reaction gas and water concentration are evenly distributed on the entire flow channel, which improves the stability of the output performance of the battery. However, in this utility model, since the fluid flows in a single channel in the flow channel, the pressure drop is relatively large, resulting in an excessively fast flow rate and insufficient reaction of the hydrogen-oxygen fuel.

Contents of the invention

The purpose of the utility model is to overcome the defects of the prior art, effectively solve the problems of large pressure drop in the flow channel of the bipolar plate and uneven fuel distribution, and provide a fuel cell bipolar plate with a mesh structure flow field.

In order to achieve the above purpose, the technical solution of the utility model is: a fuel cell bipolar plate with a mesh structure flow field, including a flow channel inlet, a sealing ring, a bipolar plate, positioning pin holes, a flow field area, an annular flow channel, Radial runners and runner outlets. The flow channel inlet, sealing ring, positioning pin hole, flow field area, annular flow channel, radial flow channel and flow channel outlet are all processed on the bipolar plate. Dowel pin holes are located on the four corners of the bipolar plate. The flow channel inlet, annular flow channel, radial flow channel and flow channel outlet are all processed in the flow field area, and the flow field area is surrounded by the sealing ring. The connections are arranged in a left-right symmetrical arrangement.

Preferably, the network-structured flow channels are composed of annular flow channels and radial flow channels, arranged symmetrically from left to right, and evenly arranged in the full flow field area.

Preferably, in the network structure flow channel, the annular flow channels are connected by radial flow channels.

Preferably, the flow channel is introduced from the flow channel inlet to the central area of the flow field area, extends from inside to outside, and is drawn out from the flow channel outlet.

The utility model has the advantages of:

(1) The network structure flow channels are symmetrically distributed, and the annular flow channels and radial flow channels are interlaced, which not only improves the flow state of the fluid in the overall flow field, reduces the pressure drop, but also avoids the problem of liquid water staying in the flow channel question.

(2) The network structure flow channel makes full use of the reaction area and improves the reaction efficiency of hydrogen-oxygen fuel.

(3) The network structure flow channel is distributed compactly and evenly, and the distribution of hydrogen and oxygen fuel and cooling water is more uniform, making the battery current output more stable.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Among them, 1-runner inlet, 2-sealing ring, 3-bipolar plate, 4-locating pin hole, 5-flow field area, 6-annular runner, 7-radial runner, 8-runner outlet.

detailed description

In conjunction with the accompanying drawings in the description, the specific implementation process of the utility model is further described.

As shown in Figure 1, a fuel cell bipolar plate with a network structure flow field includes a flow channel inlet 1, a sealing ring 2, a bipolar plate 3, a positioning pin hole 4, a flow field area 5, an annular flow channel 6, a diameter To flow channel 7 and flow channel outlet 8. Flow channel inlet 1 , sealing ring 2 , positioning pin hole 4 , flow field area 5 , annular flow channel 6 , radial flow channel 7 and flow channel outlet 8 are all processed on the bipolar plate 3 . The positioning pin holes 4 are located on the four corners of the bipolar plate 3 . The flow channel inlet 1, the annular flow channel 6, the radial flow channel 7 and the flow channel outlet 8 are all processed in the flow field area 5, and the flow field area 5 is surrounded by the sealing ring 2 to prevent fluid leakage. The mesh structure flow channel is composed of annular flow channel 6 and radial flow channel 7, which are symmetrically arranged left and right, and the full flow field area 5 is evenly arranged. The annular channels 6 are interlaced connected by radial channels 7 , the channels are introduced from the channel inlet 1 to the central area of the flow field area 5 , extend from the inside to the outside, and are led out by the channel outlet 8 .

When the battery is working, the fuel gas flows in from the flow channel inlet 1, flows to the central area of the mesh structure flow channel, and then evenly splits to the left and right sides, and the fluid on both sides flows through the annular channel 6 and the radial channel 7 respectively from the inner ring channel to the outside. The circular flow channel flows out of the flow field area 5 after being merged at the outlet 8 of the flow channel after several times of diversion and merging. During the flow process, the fluids on both sides are merged and diverted through multiple intersections, so that the fuel gas in the reaction process is mixed more uniformly, which is beneficial to improve the reaction efficiency and the stability of the fuel cell.

Claims (4)

1. it is a kind of fuel battery double plates in web frame flow field, including flow channel entry point (1), sealing ring (2), bipolar plate (3), fixed Position pin-and-hole (4), flow field area (5), annular channel (6), radial flow path (7) and runner exit (8), flow channel entry point (1), sealing ring (2), dowel hole (4), flow field area (5), annular channel (6), radial flow path (7) and runner exit (8) are processed in bipolar plates On material (3), dowel hole (4) on four angles of bipolar plate (3), flow channel entry point (1), annular channel (6), radial flow path (7) processed in flow field area (5) with runner exit (8), flow field area (5) are surrounded by sealing ring (2), it is characterised in that：Net knot Structure runner is cross-linked and is constituted by annular channel (6) and radial flow path (7), symmetrical arrangement.

2. a kind of fuel battery double plates in web frame flow field as claimed in claim 1, it is characterised in that：Described web frame Runner is made up of annular channel (6) and radial flow path (7), symmetrical arrangement, and evenly distributed flowing full place (5).

3. a kind of fuel battery double plates in web frame flow field as claimed in claim 1, it is characterised in that：Described web frame In runner, annular channel (6) is cross-linked by radial flow path (7).

4. a kind of fuel battery double plates in web frame flow field as claimed in claim 1, it is characterised in that：Described runner by Flow channel entry point (1) is introduced to flow field area (5) central area, extends from inside to outside, is drawn by runner exit (8).