One-plate three-field ultrathin fuel cell bipolar plate and fuel cell stack

Abstract

The invention relates to a one-plate three-field ultrathin fuel cell bipolar plate and a fuel cell stack. The bipolar plate comprises a flow field plate, one side of the flow field plate is an anode side, and the other side of the flow field plate is a cathode side; a fuel gas flow channel and a cooling liquid flow channel are arranged on the anode side of the flow field plate; an oxidizing gas flow channel is arranged on the cathode side of the flow field plate; the bipolar plate further comprises a cover plate which is arranged on the anode side of the flow field plate and used for separating the cooling liquid flow channel and the fuel gas flow channel located in the active area; the anode side of the flow field plate is used for being tightly matched with an anode sealing piece and the cover plate to form a fuel gas flow field and a cooling liquid flow field; and the cathode side of the flow field plate is used for being tightly matched with a cathode sealing piece to form an oxidizing gas flow field. The three flow fields are concentrated on one plate, so that the thickness of the bipolar plate can be greatly reduced, the volume of a galvanic pile is greatly reduced, and the volumetric specific power density of the galvanic pile is improved.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, in particular to a one-plate three-field ultra-thin fuel cell bipolar plate and a fuel cell stack. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) uses clean energy hydrogen as fuel, has the characteristics of high conversion efficiency and non-polluting reaction products, and is an ideal new energy carrier for transportation. However, due to certain technical bottlenecks in the current fuel cell (such as insufficient power density, insufficient life, etc.), the cost of using the fuel cell stack remains high. In the early stage of the commercialization of fuel cell vehicles, fuel cell heavy trucks, container logistics vehicles, locomotives, and ships that can achieve fixed-point refueling and are suitable for long-distance transportation are increasingly valued; The design, development and fabrication of efficient fuel cell stacks presents an urgent need. [0003] At...

AI Technical Summary

Problems solved by technology

However, due to the demand for mechanical strength, reducing the thickness of the bipolar plate through the application of non-metallic materials will affect its anti-vibration, bending resistance and air tightness, and even sacrifice electrical conductivity and thermal conductivity, which is not worth the candle.

In addition, the function of the flow field is to transmit the anion and cation reagents and cooling water to meet the fluid requirements for normal power generation, especially for high current power generation. The groove depth of the fluid should not be too shallow, which also limits the further expansion Thinning

[0011] CN112164810 discloses a fuel cell ultra-thin bipolar plate and a fuel cell stack, the fuel gas flow path includes at least two grooves with different groove depths, the oxidizing gas flow path includes at least one groove depth, the anode plate and the cathode When the backs of the plates are fastened together, the grooves of the fuel gas flow channel and the grooves of the oxidizing gas flow channel are completely staggered to form an interlocking combination, and the backs of the anode plate and the cathode plate form electrical contact through dispersed conductive support points, The position where the two are not in contact forms a cavity for cooling liquid to flow, and the cavity forms a cooling liquid flow channel with different groove depths, thus reducing the total thickness of the bipolar plate, thereby making the fuel made of the bipolar plate The volume specific power density of the battery is greatly improved. However, this design still uses the traditional design concept of two flow field plates to form a bipolar plate. The thickness of the bipolar plate is limited, and it is difficult to combine two flow field plates with flow channels. high

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