Fuel Cell Stack Clamping Structure for Tie Rod Self-Alignment

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Solution Overview

Problem

Existing fuel cell stacks face issues with tie rod buckling under vibrations, insulation wear due to vibrations and shocks, and potential short-circuiting when the tie rod is not correctly centered.

Innovation Solution

A proton-exchange membrane fuel cell design featuring a stack sandwiched between clamping plates with tapered bearing surfaces and tapered washers, allowing for automatic realignment during shocks or vibrations, reducing insulation wear, and preventing short-circuiting.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If a tie rod is used to maintain clamping of the stack, then the stack is held together under normal conditions, but the tie rod may buckle when the structure is subjected to vibrations

Engineering Contradiction:

Improveclamping capabilityVSAvoidresistance to buckling under vibration

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent introduces spherical bearing surfaces (both in the clamping plate and on the tie rod) that allow the tie rod to self-align and absorb vibrational forces through rotational movement, preventing buckling while maintaining clamping capability

Inventive Principle:

Principle #14Spheroidality (Curvature)

2Reliability

If the tie rod is covered by insulation, then electrical isolation is provided, but the insulation may wear when the structure is subjected to vibrations or shocks

Engineering Contradiction:

Improveelectrical isolationVSAvoidinsulation durability

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The patent introduces a gap between the tie rod and the through-hole in the clamping plate, which cushions the insulation coating from direct contact and wear during vibrations and shocks, while maintaining electrical isolation functionality

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Ease of manufacture

If the tie rod is not correctly centered with respect to the openings in the cells, then manufacturing tolerances are accommodated, but a short circuit may occur between the tie rod and the cells

Engineering Contradiction:

Improvetolerance accommodationVSAvoidshort circuit prevention

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent employs self-aligning spherical bearings that automatically center the tie rod with respect to the cell openings during assembly, eliminating short circuits while accommodating manufacturing tolerances without requiring precise manual alignment

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS20250201887A1Fuel cell or electrolyze structure

Publication Date: 2025.06.19 LAIR LIQUIDE SA POUR LETUDE & LEXPLOITATION DES PROCEDES GEORGES CLAUDE

AI summary

The invention relates to a proton-exchange membrane fuel cell comprising a stack of a plurality of cells, the stack being sandwiched between a first clamping plate and a second clamping plate in order to apply a predetermined clamping pressure to the stack, one of the clamping plates comprising at least one tapered seat leading into a through-hole, the stack comprising at least one clamping device that comprises a tie rod and a tapered washer received by the tapered seat in such a way that the tapered portions are facing one another, the tie rod being held in position by a first of its ends by the tapered washer so as to apply a clamping pressure to the stack.