Fuel cell unit structure and electric pile assembly

Abstract

The invention relates to the combination cell structural design which is sealed by the fuel cell metal pole plate and the membrane electrode module, concretely is a fuel cell cellular structure and its pile assembly, which includes the mold pressing metal pole plate which has two pieces flow field and the membrane electrode module (MEA). The fuel cell pole plate seals MEA and the seal structure in together and combines the orientation slot and the inspect slot to form the fuel cell unit. The structure formed the only unit module of the generate electric element when groups the pile, reduced the component quantity of the pile assembly, enhanced the assembly speed and the size stability of the pile, and reduced the replacement damage of MEA when assembles, is advantageous in enhances battery's performance, suits the mechanized production of the pole plate and the pile assembly.

Description

technical field [0001] The invention relates to the combined unit structure design of fuel cell metal pole plate and membrane electrode assembly packaging, in particular to a fuel cell unit structure and stack assembly thereof, which is suitable for hydrogen proton membrane fuel cells. Background technique [0002] Each battery cell of the fuel cell is composed of a cathode and anode plate with a flow field and a membrane electrode assembly (MEA) in the middle, and has a cooling structure. Taking the hydrogen proton membrane fuel cell as an example, in terms of the design of the anode plate and the cathode plate, the two plates are generally designed as a back-to-back structure, and a coolant flow field is formed in the middle to form a bipolar plate structure, and then connected with the MEA and the sealing line and other components are stacked alternately to form a stack of multiple cells. There is also an electric stack in which the MEA is fabricated on the outside of th...

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Problems solved by technology

[0003] However, in the traditional stack assembly process, since the MEA is exposed to the outside, it is susceptible to mechanical damage and is affected by changes in environmental humidity, which affects both the assembly speed and the performance of the MEA.

At the same time, the number of assembly components is relatively large, and the positioning device and method also affect the assembly speed, which is not conducive to the development of batch mechanized automatic assembly

At the same time, there are many sealing surfaces that must be guaranteed during stacking, which is prone to leakage

During the disassembly of the stack and the replacement of electrodes and bipolar plates, the MEA is also vulnerable to damage

[0004] For example, Shanghai Shenli Technology Co., Ltd. (patent number: 03255926.7) applied for an improved fuel cell stack assembly patent, which forms a battery unit, but the MEA is exposed, and it is relatively difficult to store and install.

The US patent Fuel Cell Stack (patent publication: US 2006 / 0068264 A1) mentions a battery assembly (unit cells), but does not disclose the technical realization method of this structure

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