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 to penetrate the separator, 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 heated to high temperature is used to contact the separator, then heat can be applied to evaluate heat-resisting properties, but it is difficult to apply heat to each point of the separator for the same period of time and pressure and temperature uniformity are poor

Engineering Contradiction:

Improvetemperature uniformityVSAvoidhole shape consistency

Core Design Contradiction:

TemperatureVSManufacturing precision

Solution Approach 1:

The invention changes the evaluation method from using heated iron to using a hot press device that can precisely control and maintain uniform temperature and pressure parameters throughout the separator surface, ensuring consistent thermal conditions during the evaluation process

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention replaces the conventional mechanical method of using heated iron contact with a controlled hot press system that applies uniform thermal and mechanical pressure through a flat heating plate, eliminating the irregular heat application of the iron method

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If heated iron is used to contact the separator, then heat-resisting properties can be evaluated, but the shapes of the holes generated are not constant making it difficult to evaluate heat-resisting properties consistently

Engineering Contradiction:

Improveevaluation consistencyVSAvoidhole shape constancy

Core Design Contradiction:

ReliabilityVSShape

Solution Approach 1:

The invention maintains constant evaluation parameters by using a hot press device with controlled temperature and pressure settings, ensuring that each evaluation test applies identical conditions to the separator, thereby producing consistent and comparable results

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention segments the evaluation process into controlled stages: applying uniform pressure through the hot press, maintaining constant temperature, and measuring specific parameters, which ensures each aspect of the evaluation is standardized and reproducible

Inventive Principle:

Principle #1Segmentation

3Difficulty of detecting and measuring

If heated iron is used to contact the separator, then thermal characteristics can be analyzed based on penetrated portion area, but thermal conduction characteristics cannot be checked

Engineering Contradiction:

Improvethermal conduction measurement capabilityVSAvoidthermal conduction characteristics data

Core Design Contradiction:

Difficulty of detecting and measuringVSLoss of information

Solution Approach 1:

The invention replaces the indirect iron contact method with a hot press system that enables direct measurement of thermal conduction characteristics through controlled heating and temperature monitoring, allowing comprehensive thermal property evaluation

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The hot press heating plate acts as an intermediary between the heat source and the separator, enabling controlled heat transfer and facilitating the measurement of thermal conduction characteristics through its uniform contact surface and controlled thermal properties

Inventive Principle:

Principle #24Intermediary (Mediator)

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 consistent application of temperature and pressure, facilitating accurate evaluation of heat transfer behavior and thermal conductivity of separators through diagrammatic representation.

Implementation Method 1

a heating unit which heats the nail

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Implementation Method 2

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

Methodology Applied

Scientific EffectThermal radiation: Thermal Radiation

Data Source

PatentUS12455252B2Device and method for evaluating heat resistance properties of separator

Publication Date: 2025.10.28 LG ENERGY SOLUTION LTD

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.