Electrode Assembly Separator Holes for Uniform Electrolyte Wetting

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Solution Overview

Problem

Short circuits frequently occur between the negative and positive electrodes in secondary batteries due to pressure increases or electrode deterioration during charging and discharging, which can be exacerbated by inadequate electrolyte impregnation and uniformity.

Innovation Solution

The electrode assembly includes a separator with holes formed in the stacking direction to facilitate electrolyte penetration and improve impregnation, optimizing the electrolyte's distribution and reducing the risk of short circuits.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a separator is used to prevent short circuits between electrodes, then reliability is improved, but electrolyte impregnation uniformity deteriorates

Engineering Contradiction:

Improveshort circuit preventionVSAvoidelectrolyte impregnation uniformity

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The separator is designed with a porous structure containing multiple holes that allow electrolyte to penetrate through the separator more effectively. This porous configuration maintains the separator's short circuit prevention function while significantly improving electrolyte distribution uniformity across the electrode assembly.

Inventive Principle:

Principle #31Porous materials

2Quantity of substance

If the separator includes holes to improve electrolyte penetration, then electrolyte impregnation is improved, but the separator structure becomes more complex

Engineering Contradiction:

Improveelectrolyte penetrationVSAvoidseparator structure

Core Design Contradiction:

Quantity of substanceVSDevice complexity

Solution Approach 1:

The separator is segmented into multiple regions with holes distributed throughout its structure. This segmentation approach creates multiple electrolyte penetration pathways without requiring a completely redesigned separator, thus improving electrolyte distribution while maintaining relatively simple manufacturing processes.

Inventive Principle:

Principle #1Segmentation

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

Enhances electrolyte impregnation and uniformity, thereby improving the capacity and lifespan of the secondary battery by preventing short circuits and ensuring efficient electrolyte movement.

Implementation Method 1

the separator includes one or more holes formed in the stacking direction of the separator... a path through which the electrolyte penetrates into the electrode assembly can be added and/or expanded

Methodology Applied

Scientific EffectCapillary action: Capillary Action

Data Source

PatentEP4704244A1Electrode assembly and secondary battery

Publication Date: 2026.03.04 SAMSUNG SDI CO LTD

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AI summary

The present disclosure relates to an electrode assembly, and a technical problem to be addressed includes providing an electrode assembly with improved impregnation. The present disclosure describes an electrode assembly that includes a first electrode and a second electrode, and a separator between the first electrode and the second electrode. The electrodes and the separator are stacked in one direction, and the separator includes one or more holes formed in the stacking direction of the separator.