Separator Membrane Frame Fixation with Dual-Zone Sealing

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Solution Overview

Problem

Existing methods for securing membranes to frames in battery and fuel cells face challenges such as complex welding processes, adhesive bond weaknesses due to environmental reactions, and the need for durable and tight connections to prevent substance mixing and short-circuits.

Innovation Solution

A method involving the creation of a fixation area with a first zone where the separator membrane is secured to the frame using adhesion or integral bonding, and a second zone where mechanical compression is applied using a frame member projection or sealing part to ensure additional fixation and prevent movement-induced mechanical loads.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If welding is used to join membrane to frame, then connection strength is improved, but process complexity increases and material compatibility requirements worsen

Engineering Contradiction:

Improveconnection strengthVSAvoidprocess complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The patent replaces welding (thermal/mechanical system) with adhesive bonding (chemical system). The adhesive layer chemically bonds the membrane to the frame, eliminating the need for complex welding equipment and processes. This substitution resolves the contradiction by maintaining connection strength while significantly reducing process complexity and material compatibility requirements.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces an adhesive layer as an intermediary substance between the membrane and frame. This adhesive mediator facilitates bonding between materials that would be incompatible for direct welding, thereby reducing process complexity while maintaining adequate connection strength through chemical adhesion.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of manufacture

If adhesive bonding is used to join membrane to frame, then ease of manufacture is improved, but connection durability worsens due to environmental reactions

Engineering Contradiction:

Improveease of manufactureVSAvoidconnection durability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent divides the bonding interface into two distinct zones: a first zone with adhesive bonding for ease of manufacture, and a second zone with mechanical compression for enhanced durability. This segmentation allows each zone to perform its specialized function, with the mechanical compression zone providing long-term structural stability that compensates for adhesive limitations in harsh environments.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent creates a composite connection system combining adhesive material and mechanical compression structures (protrusions/recesses). This composite approach leverages the ease of manufacture from adhesive bonding while adding the durability of mechanical interlocking, thereby resolving the contradiction between manufacturing simplicity and connection longevity.

Inventive Principle:

Principle #40Composite materials

3Reliability

If mechanical compression is applied to membrane, then connection reliability is improved, but membrane deformation increases

Engineering Contradiction:

Improveconnection reliabilityVSAvoidmembrane deformation

Core Design Contradiction:

ReliabilityVSShape

Solution Approach 1:

The patent applies mechanical compression locally at specific protrusion and recess locations rather than uniformly across the entire membrane surface. This localized compression provides reliable connection at critical bonding points while minimizing overall membrane deformation and preserving the membrane's functional shape in non-compressed areas.

Inventive Principle:

Principle #3Local quality

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This method provides a durable and secure connection that balances mechanical and chemical stability, preventing leakage and ensuring high cycle stability and energy efficiency in the cell stack.

Implementation Method 1

the selective conduction of ionic charge carriers through the membrane, which is necessary for the conduction of electrons via the external circuit, therefore termed as 'ion-exchange membrane'

Methodology Applied

Scientific EffectIon exchange: Ion Exchange

Implementation Method 2

the separation of the positively and negatively charged electrolytes or electrodes and the selective conduction of ionic charge carriers through the membrane

Methodology Applied

Scientific EffectPermeation: Permeation

Data Source

PatentEP4310964A1Method of fixing a membrane to a frame, cell stack and use

Publication Date: 2024.01.24 MANNHUMMEL LIFE SCI & ENVIRONMENT HLDG SINGAPORE PTE LTD

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Figure 4a~4c

AI summary

The present invention provides a method of fixing a separator membrane to a first frame member of a battery cell stack. The method comprises: creating a fixation area comprising a first zone and a second zone, wherein creating the first zone comprises securing the separator membrane to the first frame member, and wherein creating the second zone comprises mechanically compressing the separator membrane with a projection of a frame member or with a sealing part. There is also provided a cell stack and a use of an ion-exchange membrane in the disclosed cell stack.