Elongated Separator Orientation for Battery Capacity Retention

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Solution Overview

Problem

Energy storage devices with elongated separators having inorganic layers face challenges in maintaining capacity and output retention ratios due to potential reactions between inorganic components and negative electrodes.

Innovation Solution

The configuration of the energy storage device includes an elongated separator with a base material layer facing the negative electrode, preventing direct opposition between the inorganic layer and the negative electrode, thus minimizing capacity and output retention ratio degradation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If an elongated separator with an inorganic layer is used, then safety is improved through thermal shrinkage prevention, but capacity retention ratio and output retention ratio are largely lowered

Engineering Contradiction:
ImprovesafetyVSAvoidcapacity retention ratio
Core Design Contradiction:
ReliabilityVSProductivity

Solution Approach 1:

The harmful inorganic layer is extracted or removed from facing the negative electrode, eliminating the source of capacity degradation while preserving the safety function through the base material layer's thermal shrinkage capability

Inventive Principle:
Principle #2Taking out (Extraction)

Solution Approach 2:

The base material layer acts as an intermediary between the inorganic layer and the negative electrode, preventing direct contact and harmful reactions while allowing the inorganic layer to provide thermal safety functions

Inventive Principle:
Principle #24Intermediary (Mediator)

2Reliability

If an elongated separator with an inorganic layer is used, then safety is improved through hole shrinkage, but output retention ratio is largely lowered

Engineering Contradiction:
ImprovesafetyVSAvoidoutput retention ratio
Core Design Contradiction:
ReliabilityVSPower

Solution Approach 1:

The inorganic layer is extracted from the position facing the negative electrode, removing the factor that degrades output performance while maintaining the safety mechanism through base material layer thermal shrinkage

Inventive Principle:
Principle #2Taking out (Extraction)

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 the degradation of capacity and output retention ratios by ensuring the inorganic layer does not face the negative electrode, thereby enhancing the performance of the energy storage device.

Implementation Method 1

an elongated separator having an inorganic layer and minimally lowers a capacity retention ratio or an output retention ratio

Methodology Applied
Scientific EffectPhysical barrier protection:

Data Source

PatentUS10833349B2Energy storage device
Publication Date: 2020.11.10 GS YUASA INT LTD
  • US10833349B2 patent drawing
  • US10833349B2 patent drawing
  • US10833349B2 patent drawing

AI summary

An energy storage device includes: an electrode assembly which includes: an approximately rectangular positive electrode; an approximately rectangular negative electrode which is stacked alternately with the positive electrode; and a strip-like elongated separator having a base material layer and an inorganic layer which is made to overlap with the first base material layer, wherein the elongated separator is arranged between the positive electrode and the negative electrode, and the base material layer of the elongated separator faces the negative electrode in an opposed manner between the positive electrode and the negative electrode.