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Hydrogen fuel cell sealing element section design method taking alternating temperature influence into account

A fuel cell and design method technology, applied in computer-aided design, design optimization/simulation, calculation, etc., can solve problems such as large difference, difficult analysis of sealing performance and service life of hydrogen fuel cell seals, etc., to improve sealing and performance. Longevity, easy access to results

Pending Publication Date: 2021-12-07
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the seal is in an environment of alternating temperature, the elastic deformation of the seal material gradually transforms into a non-rebound plastic deformation, and the actual compressibility of the seal changes continuously, resulting in periodic changes in its contact stress and internal stress, and finally makes the hydrogen Tightness and lifetime of fuel cell seals at alternating temperatures are difficult to analyze
Most of the current hydrogen fuel cell seal designs only consider the influence of a single temperature (constant high temperature or constant low temperature) on the sealing performance, and do not fully consider the irreversible changes in the performance of the seal under alternating temperatures, resulting in the sealing of hydrogen fuel cells. The real tightness and the actual service life are quite different from the theoretical value

Method used

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  • Hydrogen fuel cell sealing element section design method taking alternating temperature influence into account
  • Hydrogen fuel cell sealing element section design method taking alternating temperature influence into account
  • Hydrogen fuel cell sealing element section design method taking alternating temperature influence into account

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Embodiment 1

[0076] combined with Figure 5 Analyze the mechanical parameters of the hydrogen fuel cell seals of the control group under constant and alternating temperature conditions, the specific description is as follows:

[0077] In this embodiment, the cross-section of a traditional wide D-shaped hydrogen fuel cell seal is selected as a control group.

[0078] In the present invention, three typical temperatures for the hydrogen fuel cell seal work are set, which are respectively low temperature (-40°C), normal temperature (20°C) and high temperature (100°C). The temperature can be obtained from low to high temperature through computer finite element simulation experiments. When it is high, the maximum contact stress gradually decreases, which are 4.67MPa, 3.21MPa and 1.58MPa in turn; the average internal stress of the seal and the maximum contact stress have the same change trend, which are 4.32MPa, 3.08MPa and 1.62MPa in turn.

[0079] According to the results in Figure (5a) and t...

Embodiment 2

[0083] combined with Figure 6 Analyze the mechanical parameters of the hydrogen fuel cell seals in the control group and the experimental group under alternating temperature conditions, and the specific description is as follows:

[0084] In this embodiment, the design of the anti-alternating temperature section of the hydrogen fuel cell seal is completed. According to the method and idea involved in the present invention, the average internal stress of the section of the new seal is reduced, the contact stress distribution and contact state are improved when the section is sealed, and the gradient degradation phenomenon of the mechanical properties of the seal with the temperature cycle is avoided. The specific model Such as image 3 shown.

[0085] Combined with Figure (6a), it can be seen that the cross-section of the hydrogen fuel cell seal obtained by the method of the present invention has a maximum contact stress at high temperature that is smaller than that at low t...

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Abstract

The invention relates to a hydrogen fuel cell sealing element section design method taking alternating temperature influence into account. The method comprises the following steps: 1) obtaining a curve of mechanical properties of a hydrogen fuel cell sealing element section along with time change under different temperature conditions; 2) obtaining a design principle of the section of the sealing element of the hydrogen fuel cell according to the curve of the mechanical property changing along with time; and 3) performing optimization design on the section of the sealing element of the hydrogen fuel cell by combining a design principle, and verifying through finite element simulation to meet design requirements. Compared with the prior art, the method has the advantages of being close to actual working conditions, strict in design and the like.

Description

technical field [0001] The invention relates to the field of hydrogen fuel cell seal design, in particular to a method for designing the section of a hydrogen fuel cell seal taking into account the influence of alternating temperatures. Background technique [0002] With the increasingly serious problems of environmental pollution and energy security, it is imminent to find alternative energy sources for fossil fuels. Hydrogen energy is regarded as "future energy" because of its high efficiency, cleanliness, economy, and safety. Fuel cell is the main place to release hydrogen energy, and it is a generating device that converts internal energy into electric energy; it is the fourth largest power generation technology after hydropower, thermal power, and atomic power, and is considered to be the first choice for clean, Efficient way of generating electricity. [0003] Hydrogen fuel cells are widely used due to their high power density, energy conversion efficiency, and relati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/23G06F30/10G06F119/08G06F119/14G06F119/18
CPCG06F30/23G06F30/10G06F2119/14G06F2119/08G06F2119/18Y02E60/50
Inventor 朱文峰杨震
Owner TONGJI UNIV