Pouch Battery Pattern Sealing Gas Pressure Distribution

Solution Overview

Problem

Secondary batteries, particularly those used in electric vehicles, face challenges in maintaining stability due to gas generation and venting issues, as existing technologies do not effectively manage gas pressure and discharge channels in high nickel material cells.

Innovation Solution

A pouch-type secondary battery with a pattern sealing part featuring multiple discontinuous seals is introduced, which distributes gas pressure by providing various pathways for gas dispersion, thereby delaying venting and enhancing stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a continuous sealing part is used to ensure complete sealing, then sealing reliability is improved, but gas pressure accumulates and causes venting

Engineering Contradiction:

Improvesealing reliabilityVSAvoidgas venting

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The sealing part is divided into multiple discrete sealings arranged in a pattern rather than a continuous seal. This segmentation allows gas to be distributed and discharged through multiple pathways, preventing pressure accumulation while maintaining overall sealing integrity. Each individual sealing remains intact, but the patterned arrangement creates gas discharge channels between them.

Inventive Principle:

Principle #1Segmentation

2Reliability

If multiple sealings are provided with discontinuous parts, then gas pressure is distributed and venting is delayed, but sealing complexity increases

Engineering Contradiction:

ImprovestabilityVSAvoidsealing structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The sealing part is divided into multiple discrete sealings arranged in a pattern rather than a continuous seal. This segmentation allows gas to be distributed and discharged through multiple pathways, preventing pressure accumulation while maintaining overall sealing integrity. Each individual sealing remains intact, but the patterned arrangement creates gas discharge channels between them.

Inventive Principle:

Principle #1Segmentation

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 effectively distributes gas pressure across multiple pathways, reducing the likelihood of venting and improving the stability of the battery module by dispersing force away from vulnerable areas, thus enhancing the battery's performance and safety.

Implementation Method 1

distributing pressure of the gas generated inside the pouch

Methodology Applied

Scientific EffectPressure distribution: Pressure Gradient

Data Source

PatentUS20230238625A1Pouch-type secondary battery comprising pattern sealing parts

Publication Date: 2023.07.27 SK ON CO LTD

AI summary

According to an embodiment of the present disclosure, there are provided a pouch-type secondary battery, including an electrode assembly, and a pouch film including an accommodating part in which the electrode assembly is disposed and a sealing part formed by fusion of edges of the accommodating part, wherein the sealing part includes a pattern sealing part on one or more sides among four sides of the pouch-type secondary battery, and the pattern sealing part includes a plurality of sealings provided with one or more discontinuous parts, and a battery module including the pouch-type secondary battery as a unit cell.