Battery Separator Heat Resistance Testing With Heated Nail Penetration

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Solution Overview

Problem

Existing methods for evaluating the heat-resisting properties of separators in secondary batteries face challenges in applying uniform temperature and pressure, leading to inconsistent hole shapes and difficulty in analyzing thermal characteristics.

Innovation Solution

An apparatus and method using a nail heated to a predetermined temperature, which penetrates the separator perpendicular to it, with controlled movement and temperature measurement by a thermal imaging camera, allowing for precise temperature distribution analysis.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If iron is used to heat the separator, then heat can be applied to the separator, but uniform temperature and pressure cannot be applied, resulting in inconsistent hole shapes

Engineering Contradiction:

Improvetemperature uniformityVSAvoidhole shape consistency

Core Design Contradiction:

TemperatureVSManufacturing precision

Solution Approach 1:

The nail is pre-heated to a predetermined temperature before penetrating the separator. This preliminary heating action ensures that the nail maintains consistent temperature throughout the penetration process, enabling uniform heat application to the separator and consistent hole formation.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The conventional mechanical iron heating method is replaced with a controlled nail penetration system. The nail delivery mechanism provides precise control over penetration depth, speed, and positioning, replacing the uncontrolled mechanical iron method and enabling uniform temperature and pressure application.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Stress or pressure

If iron is used to heat the separator, then heating can be performed, but pressure application is inconsistent, affecting evaluation accuracy

Engineering Contradiction:

Improvepressure uniformityVSAvoidheat-resisting property evaluation accuracy

Core Design Contradiction:

Stress or pressureVSMeasurement precision

Solution Approach 1:

The nail is pre-positioned and pre-heated before penetration. This preliminary preparation ensures that when the nail penetrates the separator, both temperature and pressure are applied uniformly and consistently, enabling accurate measurement of heat-resisting properties.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The uncontrolled iron heating method is replaced with a controlled nail delivery system that precisely regulates penetration depth, speed, and pressure. This mechanical substitution enables consistent pressure application and accurate evaluation of separator heat-resisting properties.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Loss of information

If conventional heating method is used, then heating can be applied, but thermal conduction characteristics cannot be measured

Engineering Contradiction:

Improvethermal conduction informationVSAvoidmeasurement system complexity

Core Design Contradiction:

Loss of informationVSDevice complexity

Solution Approach 1:

A thermal imaging camera is introduced as an intermediary measurement tool to capture temperature distribution on the separator surface. This non-contact thermal imaging technology enables measurement of thermal conduction characteristics without interfering with the nail penetration process or requiring complex contact sensor arrays.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

Complex contact-based temperature measurement systems are replaced with optical thermal imaging technology. The thermal imaging camera captures temperature distribution through non-contact infrared detection, simplifying the measurement system while enabling comprehensive thermal conduction analysis.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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

Enables accurate evaluation of heat transfer behavior and thermal conductivity of separators by adjusting temperature and pressure uniformly, providing detailed diagrammatic representation of heat transfer patterns.

Implementation Method 1

a heating unit which heats the nail

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

a temperature measuring unit which measures a temperature of the separator penetrated by the nail

Methodology Applied

Scientific EffectInfrared radiation detection: Infrared Radiation

Data Source

PatentEP4105620B1Device and method for evaluating heat resistance properties of separator

Publication Date: 2025.08.20 LG ENERGY SOLUTION LTD

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AI summary

The present invention relates to an apparatus and method for evaluating a heat-resisting property of a separator. The apparatus for evaluating a heat-resisting property of a separator includes: a separator fixing unit at which a target separator is fixed; a nail which is positioned to be perpendicular to the separator on one surface of the separator and penetrates the separator by a vertical movement; a heating unit which heats the nail; and a temperature measuring unit which measures a temperature of the separator penetrated by the nail.