A fuel cell capable of improving end plate stress

Abstract

The invention provides a fuel cell capable of gaining improved load-bearing capacity of end plates; the fuel cell comprises a pile, a front end plate, a rear end plate, a front collector late, a rearcollector plate, a fastening tape locking mechanism and a force transmission mechanism; the front end plate and the rear end plate are arranged on two sides of the pile respectively, the front collector plate is arranged between the front end plate and the pile, the rear collector plate is arranged between the rear end plate and the pile, the front end plate, the front collector plate, the pile, the rear collector plate, the rear end plate and the force transmission mechanism are sequentially locked via the fastening tape locking mechanism, the fastening tape locking mechanism includes a plurality of fastening tapes, two free ends of each fastening tape are provided respectively with tape connection blocks that may be stacked together, each tape connection block has a wedged hole, the force transmission mechanism is arranged between the front end plate and the fastening tapes, and the fastening tape locking mechanism also includes wedged bolts, and the force transmission mechanism maybe compressed to the front end plate after the wedged bolts are tightened into the wedged holes. The fuel cell according to the invention has the advantage that bending condition of the end plates isimproved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a fuel cell capable of improving the stress of an end plate. Background technique [0002] A fuel cell is an electrochemical device that converts the chemical energy of fuel (such as methanol, hydrogen, etc.) into electrical energy, referred to as a stack, and a proton exchange membrane fuel cell (PEMFC) is one of them. In practical applications, hundreds of single cells are generally connected in series to form an electric stack. The manufacturing error of each component and the assembly error in the assembly process will affect the quality of the assembly, and even seriously affect the performance of the electric stack. The assembly pressure is one of the important parameters affecting the performance of the fuel cell stack. If its value is too small, the contact pressure between the bipolar plate and the gas diffusion layer will be too small, which will eventually affect the...

AI Technical Summary

Problems solved by technology

[0008] The disadvantage of the scheme in patent CN200610171874.9 is that although the arc-shaped end plate can improve the force of the end plate compared with the flat end plate, there is a groove in the middle of the arc-shaped end plate to make the two sides of the end plate The arc-shaped stress concentration area is stressed, and there is no force in the middle, which will still cause bending deformation in the middle of the end plate

[0009] The disadvantage of the scheme in the patent CN205692910U is that it is difficult to realize the processing and manufacturing of the head of the steel strip, and the bolt connection is adopted, and the pin with a larger size needs to be selected, and the assembly is time-consuming, which is unfavorable for the production assembly

In addition, when adjusting the pretension of the steel belt, in order to make the force on both sides as uniform as possible, it needs to be adjusted on both sides at the same time, and the consistency of the adjustment amount is not easy to control.

Images