Three-dimensional flow field bipolar plate with enhanced heat and mass transfer function and preparation method

Abstract

The invention relates to a three-dimensional flow field bipolar plate with an enhanced heat and mass transfer function, which comprises a substrate, an air inlet and an air outlet, the substrate is provided with an integrally formed three-dimensional flow field, the three-dimensional flow field comprises an external flow field and an internal flow field arranged below the external flow field, the internal flow field comprises an air inlet channel communicated with the air inlet and an S-shaped flow field, and the S-shaped flow field is communicated with the air inlet. The snakelike flow field comprises a gas flow channel and a ridge, the gas inlet channel is communicated with the gas flow channel, a plurality of reaction gas holes are formed in the position, corresponding to the gas flow channel, of the external flow field, connecting grooves are formed between the reaction gas holes, and the two ends of each connecting groove are communicated with the adjacent reaction gas holes respectively. The three-dimensional flow field structure can realize forced convection between reaction gases on the surface, strengthen the heat and mass transfer performance of the bipolar plate and improve the utilization rate of fuel. Selective laser melting is the most effective method for preparing the fuel cell bipolar plate of the three-dimensional complex refined flow field, a flow channel in any complex shape can be prepared, and the process is simple and high in reliability.

Description

technical field [0001] The invention relates to a fuel cell bipolar plate, in particular to a three-dimensional flow field bipolar plate with enhanced heat and mass transfer function and a preparation method. Background technique [0002] A fuel cell is a power generation device that converts the chemical energy of fuel into electrical energy through electrochemical principles. It has the characteristics of cleanliness, high efficiency and continuous operation. There are many types of fuel cells. For underwater ships and aircraft, the most promising one is the proton exchange membrane fuel cell (PEMFC). The advantages of PEMFC's light weight, small size and high power density can expand the storage capacity and enhance the flexibility and combat effectiveness of the submarine. In addition, the acoustic characteristics do not exceed those of diesel-electric propulsion, enabling ultra-quiet operation. These characteristics make the concealment of the ship greatly improved, a...

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Problems solved by technology

Therefore, in order to solve the problems of insufficient mass and heat transfer capacity and low current density of the traditional two-dimensional flow field, this paten...

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