A fuel cell stack structure

Abstract

The invention relates to a fuel cell stack structure, and specifically relates to a novel fuel cell stack structure which is convenient to dismount and mount and relatively high in power density. The fuel cell stack structure comprises fuel cell assemblies which are arranged from top to bottom in a sequence and integrally positioned in an opening frame; each fuel cell assembly comprises an upper fuel cell collector plate, an upper single polar plate, a cell unit, a lower single polar plate and a lower fuel cell collector plate; a cover plate for fixing the fuel cell assemblies and sealing the opening frame is connected to the upside of the opening frame. According to the fuel cell stack structure, the space can be saved, and the cell stack power density can be increased; a cell stack is uniformly stressed; the size of the cell stack can be directly determined according to the size of the frame structure and does not need to be adjusted during assembling; when in assembling or disassembling, the opposite positions of the fuel cell assemblies are fixed and the probability of dislocation is low.

Description

technical field [0001] The invention relates to a fuel cell stack structure, in particular to a novel fuel cell stack structure which is easy to assemble and disassemble and has high power density. Background technique [0002] Fuel cells have many advantages such as high power density, high energy conversion efficiency, quiet working process, and environmental friendliness, which have attracted widespread attention from all over the world, and have been successfully applied in a certain range. [0003] In order to obtain higher operating voltage and higher output power, it is necessary to combine multiple single cells to form a fuel cell stack. A fuel cell stack is usually composed of end plates, collector plates, pole plates, electrodes and other components. The structure of a fuel cell stack directly determines its power density, consistency and production efficiency. [0004] At present, fuel cell stacks are usually fastened with screws, but this method often causes a s...

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Problems solved by technology

[0004] At present, fuel cell stacks are usually fastened with screws, but this method often causes a small amount of bending on the end plate, resulting in uneven force distribution on the electrodes, which affects the performance and life of the fuel cell, and screw holes need to be reserved on the end plate, resulting in The plate size is often larger than the plate size which is not conducive to the miniaturization of the fuel cell stack

[0005] In order to solve this problem, the patent CN101453030B (2011-3-9) discloses a fastening method for an integrated fuel cell stack, and proposes to use a fastening belt instead of a screw to bind and lock the stack, which greatly improves the uniformity of the force. and save space to a certain extent, but the assembly and disassembly process requires a positioning device, and the process is still relatively cumbersome

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