A detachable independently sealed fuel battery

Abstract

The invention discloses a separated independent sealing fuel cell, including a gas guide plate and a membrane electrode assembly; part of a sealing area of the membrane electrode assembly is composed of a proton exchange membrane by extending to the periphery; a first sealing ring is arranged on the gas guide plate around the active area, a second sealing ring is arranged around the non-active area, a buffer area is arranged between the first sealing ring and the second sealing ring on the gas guide plate for isolating the first sealing ring and the second sealing ring, and the sealing area of the membrane electrode assembly is corresponding to the sealing area of the first sealing ring and is extruded by the first sealing ring. The fuel cell has superior sealing performance.

Description

technical field [0001] The invention relates to a fuel cell, in particular to a separated independent sealed fuel cell, and the fuel cell with this structure has excellent sealing performance. Background technique [0002] Proton exchange membrane fuel cell is an environmentally friendly power generation device that converts the chemical energy of fuel into electrical energy. It has broad application prospects due to its superior performance such as high power generation efficiency and long power generation time. [0003] A proton exchange membrane fuel cell is composed of multiple basic battery cells. In a basic unit battery, as shown in FIG. 1 , it is composed of two parallel gas deflectors 1 and a membrane electrode assembly sandwiched between them. Generally, the membrane electrode assembly is divided into three parts: the electrochemically active area, the sealing area and the electrochemically inactive area. The electrochemically active area is the core of the proton...

AI Technical Summary

Problems solved by technology

[0006] (1) The main function of the proton exchange membrane is reflected in the active area. When making the membrane electrode assembly, the proton exchange membrane is used in the entire inactive area, which is a waste of expensive proton exchange membranes.

However, if a thin rubber sheet or engineering plastic film is used to replace the proton exchange membrane in the inactive area of ​​the membrane electrode assembly, the cost reduction effect cannot be achieved because of the complicated manufacturing process and difficulty.

[0007] (2) In the electrochemically inactive area of ​​the membrane electrode assembly, the exposed proton exchange membrane is very easy to wrinkle or even tear during the process of production and use, causing damage

On the one hand, it is very difficult and complicated to make such a membrane-electrode assembly, and on the other hand, the possibility of tearing cannot be completely avoided.

[0008] (3) Since the active area and the inactive area are only separated by a sealing ring, due to reasons such as performance and thermal expansion and contraction, the leakage of the sealing ring always exists, and the leakage not only reduces the performance of the fuel cell, if this The leak happened between hydrogen and oxygen, the consequences are very serious

[0010] (5) Since the membrane electrode assembly is generally soft in the inactive area, that is, there is only a proton exchange membrane without a support, in the process of making the membrane electrode assembly, the proton exchange membrane without a support is prone to Wrinkles, which cause great difficulties in the assembly and sealing of proton exchange membrane fuel cells, and bring unfavorable factors to industrial production

However, this design still only relies on closely adjacent sealing rings to isolate the active area from the inactive area, and still cannot solve the leakage problem caused by the performance of the sealing ring and thermal expansion and contraction.

There are mutual leakages between different parts of the gas or water that should be completely independent. When such leakage reaches a certain level, it will cause very serious consequences.

On the other hand, this design is also very difficult from a practical point of view. Its sealing ring is designed to be in the shape of two steps, and the size of the membrane electrode assembly must be within the range of the first gas sealing ring. , a slightly larger size will extend to the range of the second gas sealing ring, and a smaller size will not be well sealed by the first gas sealing ring, a slight deviation in assembly will cause leakage, and the effective range is only about 8mm

At the same time, the height difference between the two steps of this stepped sealing ring is very small, only half of the thickness of the proton exchange membrane (about 0.025mm ~ 0.064mm), and it is difficult for the eyes to distinguish

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