Rechargeable Battery Temperature Protection Element Mounting

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Solution Overview

Problem

Pouch type rechargeable batteries face malfunctions due to inadequate temperature protection, as existing temperature protection elements are not effectively influenced by the enclosure temperature, leading to inefficient temperature detection and potential safety risks.

Innovation Solution

A temperature protection element with improved sensitivity is affixed to the external surface of the pouch using a double-sided adhesive tape and covered with insulation tape, ensuring direct mechanical contact with the enclosure and enhanced heat dissipation, allowing for accurate temperature detection and reliable activation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the temperature protection element is mounted on the external surface of the pouch using a double-sided adhesive tape, then the sensitivity to enclosure temperature is improved, but the device complexity increases

Engineering Contradiction:

Improvetemperature detection accuracyVSAvoidassembly structure complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The temperature protection element assembly is divided into separate functional components: the PTC element, the double-sided adhesive tape for mounting, and the insulation tape for coverage. This segmentation allows each component to perform its specific function optimally while simplifying the overall assembly process.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The double-sided adhesive tape acts as an intermediary between the temperature protection element and the pouch surface, providing reliable mechanical attachment while allowing thermal contact. The insulation tape serves as an intermediary that covers the element to prevent short circuits while maintaining thermal sensitivity to the enclosure.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the temperature protection element is covered with insulation tape, then the reliability is improved by preventing short circuits, but the heat dissipation efficiency deteriorates

Engineering Contradiction:

Improveelectrical insulation reliabilityVSAvoidheat dissipation efficiency

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The insulation tape provides electrical insulation only where needed (covering the temperature protection element) while leaving other areas open for heat dissipation. This localized application of insulation maintains reliability without compromising overall thermal management.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The insulation tape, which could potentially trap heat, is instead used to convert the potential harm of short circuits into a beneficial protective measure. The tape is selected and applied to provide electrical isolation while maintaining adequate thermal contact with the pouch enclosure for temperature sensing.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Measurement precision

If the temperature protection element is directly affixed to the pouch, then the temperature detection sensitivity is improved, but the ease of manufacture deteriorates

Engineering Contradiction:

Improvetemperature sensing sensitivityVSAvoidassembly ease

Core Design Contradiction:

Measurement precisionVSEase of manufacture

Solution Approach 1:

The double-sided adhesive tape is pre-applied to the temperature protection element before assembly, allowing for easy positioning and attachment to the pouch surface. This preliminary preparation simplifies the manufacturing process while ensuring proper thermal contact for sensitive temperature detection.

Inventive Principle:

Principle #10Preliminary action

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

The solution enhances the operational quality of the temperature protection element by improving its sensitivity to the enclosure temperature, ensuring prompt and accurate detection of temperature risks, thereby preventing malfunctions and ensuring safety.

Implementation Method 1

The temperature protection element is attached to the pouch and thereby covered by an insulation tape. The temperature protection element is thus correctly influenced by the temperature of the enclosure (e.g. a pouch).

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

a temperature protection element, for instance of the type having a positive temperature coefficient, is used between the protective circuit module and the positive electrode lead tab.

Methodology Applied

Scientific EffectPositive temperature coefficient effect: Thermo-resistive Effect

Data Source

PatentEP2579384B1Rechargeable battery

Publication Date: 2019.12.04 SAMSUNG SDI CO LTD

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AI summary

One aspect of the present invention has been made in an effort to provide a rechargeable battery having improved operation quality by preventing malfunction of a temperature protection element. A rechargeable battery according to an exemplary embodiment of the present invention includes a pouch installing an electrode assembly, first and second lead tabs connected to the electrode assembly and drawn out to one side of the pouch, a temperature protection element connected to the first tab, and a connection tab connected to the temperature protection element. The temperature protection element is attached to the pouch using a double-sided adhesive tape and covered by an insulation tape.