Three-Electrode Cell Layout for Accurate Cathode-Anode Analysis

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Solution Overview

Problem

Conventional three-electrode batteries face issues with electrode pitting and internal short circuits due to the shape and stiffness of the reference electrode, leading to inaccurate cathode/anode separation analysis and potential damage from increased internal pressure.

Innovation Solution

A three-electrode battery design featuring a film-shaped reference electrode with perforated holes and a protruding region, combined with auxiliary and main separators, to minimize blocking areas and facilitate ion diffusion, reducing the risk of internal short circuits and electrode damage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a wire-type reference electrode is used, then the reference electrode can be inserted into the separator, but a blocking area is generated and unreacted areas are formed, making accurate cathode/anode separation analysis difficult

Engineering Contradiction:

Improveease of reference electrode insertionVSAvoidcathode/anode separation analysis accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The patent replaces the wire-type reference electrode with a film-shaped reference electrode that has flexibility and can conform to the separator surface. This thin film structure eliminates the blocking area problem while maintaining electrical contact, allowing accurate cathode/anode separation analysis without unreacted areas.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The film-shaped reference electrode incorporates a porous structure that allows ion diffusion through the electrode material. This porosity prevents blocking of the separator surface while maintaining the reference electrode's electrical function, eliminating the formation of unreacted areas and enabling accurate analysis.

Inventive Principle:

Principle #31Porous materials

2Strength

If the reference electrode has stiffness or thickness, then it can maintain structural integrity, but the blocking area is enlarged and pressure increases, causing damage to the electrode and separator

Engineering Contradiction:

Improvereference electrode structural integrityVSAvoidelectrode and separator damage from pressure

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The film-shaped reference electrode uses a flexible thin film structure that can deform and conform to the separator surface, dramatically reducing the blocking area and internal pressure. This flexible design eliminates the structural integrity issue while preventing damage to the electrode and separator from pressure buildup.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The patent changes the physical parameters of the reference electrode by transitioning from a wire-type structure with fixed stiffness and thickness to a film-shaped structure with variable flexibility and reduced thickness. This parameter change allows the electrode to adapt to pressure conditions without causing damage while maintaining its reference function.

Inventive Principle:

Principle #35Parameter changes

3Volume of moving object

If internal pressure increases due to electrode thickness and gas generation, then the battery can accommodate larger electrodes, but damage to the electrode and separator occurs

Engineering Contradiction:

Improveelectrode sizeVSAvoidelectrode and separator integrity

Core Design Contradiction:

Volume of moving objectVSReliability

Solution Approach 1:

The film-shaped reference electrode acts as a flexible element that can deform under pressure, accommodating volume changes from larger electrodes and gas generation without causing damage. This flexible structure maintains reliability while allowing the battery to accommodate larger electrodes.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The film-shaped reference electrode provides a cushioning effect by its flexibility and ability to deform, absorbing pressure increases before they can cause damage to the electrode and separator. This beforehand cushioning protects the battery components from pressure-related failures.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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

The new design allows for highly reliable cathode/anode separation analysis, minimizing blocking areas and preventing electrode pitting, suitable for batteries with significant thickness changes and long-term degradation, and is applicable to medium or large-sized batteries.

Implementation Method 1

facilitate ion diffusion

Methodology Applied

Scientific EffectIon diffusion: Diffusion

Data Source

PatentEP4300090B1Three-electrode cell and system for performance analysis using same

Publication Date: 2025.07.16 LG ENERGY SOLUTION LTD

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AI summary

The present invention relates to a three-electrode battery and a system for performance analysis using same, and the purpose of the present invention is to provide a three-electrode battery in which an electrode indentation phenomenon and an internal short circuit phenomenon are suppressed, and a system for performance analysis using the three-electrode battery.