Electrode Resin Layer Ion Permeability Gradient

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing electrochemical device electrodes face challenges in preventing electrical short circuits, maintaining capacitive energy density, and preventing peeling of the active material layer, particularly due to instability in the boundary between coated and non-coated portions and the complexity of forming insulating members.

Innovation Solution

The electrode features a resin layer with high-permeability and low-permeability portions, along with a transition portion, to ensure ion permeability decreases gradually between these, covering both coated and non-coated areas, thereby preventing short circuits and maintaining energy density while allowing uniform pressure and reducing peeling risks.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a tape type insulating member is arranged on the boundary portion between coated and non-coated portions, then electrical short circuit prevention is improved, but device complexity and manufacturing difficulty increase

Engineering Contradiction:

Improveelectrical short circuit preventionVSAvoidstructure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines the insulating function and the active material layer into a single integrated structure. The resin layer serves dual purposes: as an insulating barrier preventing short circuits and as part of the active material structure, eliminating the need for separate tape type insulating members and reducing overall device complexity

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The resin layer performs multiple functions simultaneously: it provides electrical insulation at the boundary portion, maintains structural integrity of the active material layer, and enables ion permeability for electrochemical reactions. This multi-functionality replaces what would traditionally require multiple separate components

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Manufacturing precision

If the length of the portion where thickness changes is increased to stabilize insulating member position, then manufacturing stability is improved, but capacitive energy density decreases

Engineering Contradiction:

Improveinsulating member position stabilityVSAvoidcapacitive energy density

Core Design Contradiction:

Manufacturing precisionVSQuantity of substance

Solution Approach 1:

The patent applies different properties of the resin layer at different locations: the boundary portion has high insulating properties with lower ion permeability, while the central active material region maintains high ion permeability for electrochemical reactions. This localized property distribution achieves both positioning stability and energy density

Inventive Principle:

Principle #3Local quality

3Temperature

If a heat resistant porous layer is provided to enclose the active material layer, then thermal safety is improved, but ion permeability and capacitive performance may be reduced

Engineering Contradiction:

Improveheat resistanceVSAvoidion permeability

Core Design Contradiction:

TemperatureVSReliability

Solution Approach 1:

The patent modifies the resin layer to achieve appropriate ion permeability parameters while maintaining thermal stability. By controlling the resin composition and structure, the material provides sufficient ion transport pathways without compromising the thermal safety function

Inventive Principle:

Principle #35Parameter changes

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 configuration effectively prevents electrical short circuits, maintains capacitive energy density, and reduces peeling of the active material layer, ensuring stable operation and improved productivity in manufacturing.

Implementation Method 1

the resin layer has a high-permeability portion having high ion permeability and positioned on the coated portion; a low-permeability portion having low ion permeability and positioned on a portion of the non-coated portion

Methodology Applied

Scientific EffectIon permeability gradient: Permeation

Data Source

PatentUS11158851B2Electrode for electrochemical device, electrochemical device, and method for manufacturing same

Publication Date: 2021.10.26 ENVISION AESC ENERGY DEVICES LTD

AI summary

An electrode for an electrochemical device has a coated portion in which an active material layer is formed on a current collector; a non-coated portion in which the active material layer is not formed; and a resin layer that is laminated such that the coated portion and a portion of the non-coated portion are covered; wherein: the resin layer has a high-permeability portion having high ion permeability and positioned on the coated portion; a low-permeability portion having low ion permeability and positioned on a portion of the non-coated portion; and a transition portion in which ion permeability decreases from the high-permeability portion side toward the low-permeability portion side and positioned between the high-permeability portion and the low-permeability portion.