Pouch Battery Venting Guidance Device Using Inverted Elastic Penetration

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Solution Overview

Problem

Existing pouch-shaped secondary batteries face challenges in safely discharging gas without increasing overall size or reducing capacity, as existing venting mechanisms require high pressure for hole formation or are not applicable to general electrode leads.

Innovation Solution

A venting guidance device is integrated into the pouch-shaped battery case using an elastic member that forms a through-hole for gas discharge when pressure reaches a predetermined limit, utilizing a pressure-sensing member, trigger, and penetration member to create openings without additional devices or size increase.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a penetration member moves upwards to penetrate the pouch using an elastic member, then gas discharge is enabled, but a great increase in pressure is needed which may not form a through-hole at desired pressure

Engineering Contradiction:

Improvegas discharge reliabilityVSAvoidpressure required for hole formation

Core Design Contradiction:

ReliabilityVSStress or pressure

Solution Approach 1:

Instead of moving the penetration member upwards against the elastic member's restoring force, the invention inverts the approach by moving the penetration member downwards along with the plate. This allows the penetration member to penetrate the pouch when the elastic member shrinks, utilizing the elastic force in the same direction as penetration, thereby reducing the required pressure from 10 atm to 3 atm.

Inventive Principle:

Principle #13The other way round (Inversion)

2Reliability

If existing venting mechanisms are used, then gas discharge is possible, but the battery size must be increased or capacity reduced

Engineering Contradiction:

Improvesafety through gas dischargeVSAvoidbattery volume

Core Design Contradiction:

ReliabilityVSVolume of moving object

Solution Approach 1:

The venting guidance device is designed to fit within the existing battery structure without requiring additional space. The device integrates multiple functions (pressure sensing, penetration, and venting guidance) into a compact unit that can be installed in the battery case without increasing overall battery volume or reducing capacity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Ease of operation

If a plate moves upwards to shrink the elastic member, then the penetration member can penetrate the pouch, but the directions of plate movement and elastic member restoration are opposite requiring great pressure increase

Engineering Contradiction:

Improvepenetration mechanism operationVSAvoidpressure increase required

Core Design Contradiction:

Ease of operationVSStress or pressure

Solution Approach 1:

The invention inverts the traditional penetration mechanism by having the plate and penetration member move downwards instead of upwards. This allows the elastic member to shrink and restore in the same direction as the penetration motion, eliminating the need for opposing forces and reducing the pressure required for penetration from 10 atm to 3 atm.

Inventive Principle:

Principle #13The other way round (Inversion)

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 enables rapid and safe gas discharge before explosion, maintaining battery capacity and size, and is applicable to general pouch-shaped batteries without additional components.

Implementation Method 1

a penetration member (114) configured to penetrate the pouch-shaped battery case to form the through-hole in the pouch-shaped battery case when the elastic member (113) shrinks

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 2

configured to form a through-hole for gas discharge in the pouch-shaped battery case using an elastic member that is triggered when the pressure in the pouch-shaped battery case reaches or exceeds a predetermined limit pressure

Methodology Applied

Scientific EffectPressure sensing: Pressure Increase

Data Source

PatentUS11189881B2Pouch-shaped secondary battery comprising venting guidance device

Publication Date: 2021.11.30 LG ENERGY SOLUTION LTD

AI summary

Disclosed herein is a pouch-shaped secondary battery comprising a pouch-shaped battery case, an electrode assembly having a positive electrode, a separator, and a negative electrode that are sequentially stacked, the electrode assembly being received in the pouch-shaped battery case, and a venting guidance device located in the pouch-shaped battery case, the venting guidance device being configured to form a through-hole for gas discharge in the pouch-shaped battery case using an elastic member, the elastic member being configured to be actuated when a pressure in the pouch-shaped battery case reaches or exceeds a predetermined limit pressure.