Pouch Battery Safety Vent with Radial Gas Flow Path

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Solution Overview

Problem

Pouch type secondary batteries with existing safety vents are limited in their ability to exhaust gases in a predetermined direction, making it difficult to integrate them into devices where sensitive components are adjacent to the electrode tab, as the design requires changes to avoid gas exposure.

Innovation Solution

A pouch type secondary battery design featuring a sealing part with an inner and outer sealing surface, where the outer sealing surface has a safety vent that allows gas to be exhausted in any desired direction, independent of the electrode tab's location, and includes an intermediate sealing part to manage pressure and prevent damage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the safety vent is positioned adjacent to the electrode tab, then the gas can be exhausted through the sealing part, but the device sensitive to heat or gas may be damaged or corroded

Engineering Contradiction:

Improvesafety of gas exhaustionVSAvoiddamage to sensitive components

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The sealing part is divided into an inner sealing part and an outer sealing part, with the gas flow path located between them. This segmentation allows the safety vent to be positioned in the outer sealing part away from the electrode tab, while still maintaining the gas exhaustion function through the sealed structure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The gas flow path acts as an intermediary channel between the inner sealing part and outer sealing part. It allows gas to be exhausted from the battery interior through the safety vent in the outer sealing part, directing the gas flow away from sensitive components while maintaining a sealed structure.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If the safety vent is positioned away from the electrode tab, then sensitive components are protected, but the gas flow path becomes more complex

Engineering Contradiction:

Improveprotection of sensitive componentsVSAvoidstructure of sealing part

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The outer sealing part serves multiple functions: it provides the safety vent for gas exhaustion, maintains the sealed structure of the battery, and directs gas flow away from sensitive components. This multi-functionality reduces the need for additional separate components.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Adaptability or versatility

If the sealing part is made larger to accommodate the gas flow path, then the safety vent can be positioned flexibly, but the battery volume increases

Engineering Contradiction:

Improvepositioning flexibility of safety ventVSAvoidbattery volume

Core Design Contradiction:

Adaptability or versatilityVSVolume of moving object

Solution Approach 1:

The gas flow path is positioned in the radial direction between the inner and outer sealing parts, utilizing the thickness dimension of the sealing structure rather than increasing the planar area. This allows flexible positioning of the safety vent without significantly increasing the battery's overall volume.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The gas flow path is nested within the sealing part structure itself, utilizing the space between the inner and outer sealing parts. This nested arrangement allows the safety vent to be positioned flexibly while minimizing the increase in battery volume.

Inventive Principle:

Principle #7Nested doll (Nesting)

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 the safe exhaustion of gases away from sensitive components, allowing the battery to be integrated into devices without design modifications, as the safety vent can be positioned away from the electrode tab, reducing the risk of damage and ensuring reliable gas discharge.

Implementation Method 1

an outer sealing part defining a gas flow path between the inner and outer sealing parts to surround a peripheral portion of the inner sealing part

Methodology Applied

Scientific EffectGas flow:

Data Source

PatentUS9768429B2Pouch type secondary battery having safety vent

Publication Date: 2017.09.19 LG ENERGY SOLUTION LTD

AI summary

The present invention relates to a pouch type secondary battery. The pouch type secondary battery includes an electrode assembly, and a pouch type case in which the electrode assembly is accommodated, the pouch type case comprising a sealing part disposed on an edge thereof. The sealing part includes an inner sealing part forming a closed curve to protect the electrode assembly against the outside, and an outer sealing part defining a gas flow path between the inner and outer sealing parts to surround a peripheral portion of the inner sealing part, the outer sealing part having a safety vent.