A proton exchange membrane fuel cell stack steel belt fastening device

Abstract

The invention discloses a proton exchange membrane fuel cell stack steel strip fastening device. The device structurally comprises a rear end plate, a rear end copper bar, a graphite plate membrane electrode assembly, a front end plate, disc springs and a disc spring pressing plate sequentially from rear to front, U-shaped steel strips are used to lock the above parts, a certain arc surface is designed on the rear end plate, a groove is formed at a position, where each steel strip is pasted, of the rear end plate in order to enable the corresponding steel strip to apply binding force to the graphite plate membrane electrode assembly more uniformly, and convenience is brought to clamping the steel strips; a clamping groove is formed in the front end plate, the disc spring pressing plate can be inserted into the clamping groove in order to prevent torsion of the steel strips when first screws is rotated into cross rods, and the steel strips are enabled not to contact with a graphite plate. When the graphite plate membrane electrode assembly becomes shorter, the disc springs loosen by a certain length to offset length change of the graphite plate membrane electrode assembly; the graphite plate membrane electrode assembly becomes longer, the disc springs are compressed to offset length change of the graphite plate membrane electrode assembly, and performance of a cell stack is ensured not to be affected greatly.

Description

technical field [0001] The invention relates to the field of proton exchange fuel cells, in particular to a proton exchange membrane fuel cell stack steel belt fastening device. Background technique [0002] A fuel cell is a device that directly converts the chemical energy of an oxidizing agent and a reducing agent into electrical energy through an electrocatalytic reaction. It is a new type of power generation device that is efficient, safe, clean and flexible. Among them, the proton exchange membrane fuel cell has a wide range of application prospects in ground power stations, electric vehicles and portable power supplies due to its significant advantages such as high efficiency, high energy density, low reaction temperature, no noise, and no pollution. The interior of the fuel cell is mainly composed of proton exchange membrane, electrochemical reaction catalyst, diffusion layer and bipolar plate. When the fuel cell is working, the following reaction process occurs insi...

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Problems solved by technology

[0009] 1. Use a stainless steel strip with a thickness of 0.1-0.5cm. The steel strip must be bent into that shape before use. Once bent, the length of the straight line in the middle of the steel strip will be fixed, but the "graphite" in the middle of the fuel cell The ideal compression length of the "plate and membrane electrode" cannot be accurately known in advance and needs to be adjusted during the activation test. Therefore, once the steel strip in this patent is installed, it cannot be fine-tuned, and the performance of the stack cannot be well controlled.

[0010] 2. As the temperature changes, thermal expansion and contraction occur, the elasticity of the membrane electrode decreases, and the sealant on the surface of the graphite plate deforms, resulting in a change in the length of the "graphite plate and membrane electrode" in the middle of the fuel cell. However, this steel strip structure cannot Adapting to this length change will have a certain performance impact on the fuel cell

[0012] 1. After the battery is assembled by the assembly equipment, after the battery is removed from the assembly equipment, it needs to use a large rotational force to tighten it further. The wrench is limited by the side of the battery, and the rotation can only be within a certain angle.

[0013] 2. During the fastening process, the steel strip will be twisted and hit the graphite plate

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