Metal Bipolar Plates of Proton Exchange Membrane Fuel Cells with Non-adhesive Sealing Structure

Abstract

The invention discloses a metal bipolar plate with a proton exchange film fuel cell bonding-free sealing structure. The metal bipolar plate is composed of a cathode plate and an anode plate, wherein acathode cavity, an anode cavity of the bipolar plate and a coolant cavity are sealed through assembly force by adopting sealing rings; flow field gas inlets and outlets of the cathode plate and the anode plate are led in in a manner of forming holes in the polar plates. Injection molding of a soft rubber A and a hard rubber B is s equentially carried out for several times to form a sealing ring,a gas channel rubber strip and a coolant channel rubber strip, the shore hardness of the rubber A is 35-45 A, and the shore hardness of the rubber B is 70-80 A; the sealing rubber strip and the channel rubber strip realize sealing and channel functions, the cathode cavity, the anode cavity and the coolant cavity of the metal bipolar plate are isolated and sealed by utilizing compression elasticityof the the low-hardness A rubber material, balanced sealing of the coolant cavity and an air cavity structure under assembly force control is achieved, pressure resistance and sealing performance ofthe bipolar plate are guaranteed and improved, cost of a fuel cell is reduced, reliability and economic property are achieved, the service life is long, and stable operation of the fuel cell stack inthe working process is supported.

Description

technical field [0001] The invention relates to a bipolar plate structure improvement technology for a proton exchange membrane fuel cell, and belongs to the technical field of methods or devices for directly converting chemical energy into electrical energy or battery packs of IPC classification H01M, especially the welding-free sealing structure of a proton exchange membrane fuel cell metal bipolar plates. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is an electrochemical conversion device that directly converts chemical energy in fuel and oxidant into electrical energy. The anode of the proton exchange membrane fuel cell is fed with fuel as hydrogen, the cathode is fed with air, and the oxygen in the air as the cathode reaction gas. In addition to the membrane electrode, the main core components of PEMFC, the bipolar plate is also an important core component of PEMFC. It is the main part of the volume and weight of the PEMFC battery. It has a ...

AI Technical Summary

Problems solved by technology

The existing process combines the cathode plate and the anode plate by welding and bonding to become a bipolar plate. This type of welding and bonding process is relatively complicated and has low reliability. Especially, for metal plates, welding will Destroy the metallographic structure of the metal and affect the corrosion resistance. In addition, the surface of the metal plate is bonded and consolidated with polymer materials. Although the metal plate itself does not change in the fuel cell environment, the consolidated polymer material will These hidden dangers will inevitably affect the sealing reliability and durability of the interface between the polymer material and the metal plate

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