Segmented Side Sealing for Pouch Battery Gas Venting
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Solution Overview
Problem
Pouch type rechargeable batteries face issues with gas emission and safety risks due to overcharging or high-temperature exposure, and their compact design can cause manufacturing inefficiencies and damage to battery packs.
Innovation Solution
The battery design features adjustable side sealing sections in the pouch case, allowing for easier gas emission and improved installation by reducing the width of these sections, which also enhances the molding process and prevents damage to battery packs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the side sealing sections are made wide to ensure sealing reliability, then sealing reliability is improved, but gas emission capability deteriorates and manufacturing workability worsens
Solution Approach 1:
The side sealing sections are divided into multiple separate sealing sections along the longitudinal direction. Each sealing section is separated by a predetermined distance, creating gaps between them. This segmentation allows gas to escape through the gaps between sealing sections while each individual sealing section maintains its sealing function, thus resolving the contradiction between sealing reliability and gas emission capability.
2Reliability
If the side sealing sections are made wide to ensure sealing reliability, then sealing reliability is improved, but manufacturing workability and installation efficiency deteriorate
Solution Approach 1:
By segmenting the side sealing sections and separating them by a predetermined distance, the overall width of the sealing structure is reduced compared to a continuous wide sealing section. This segmentation improves manufacturing workability and installation efficiency while maintaining sealing reliability through the distributed sealing sections.
3Quantity of substance
If the battery is designed in compact size to meet portable device requirements, then energy density is improved, but safety risk worsens due to gas accumulation
Solution Approach 1:
The segmented side sealing sections create multiple gaps along the longitudinal direction that serve as gas escape pathways. This allows compact battery design with adequate gas venting capability, preventing gas accumulation and associated safety risks while maintaining high energy density through compact form factor.
Solution Approach 2:
The gaps between the segmented sealing sections act as intermediary channels for gas escape. These gaps provide a controlled pathway for gas to exit the battery safely without compromising the compact design or requiring additional safety components, thus mediating between compact size and safety requirements.
Data Source
AI summary
A pouch type rechargeable battery that comprises an electrode assembly comprising a first electrode, a second electrode, and a separator interposed between the first and second electrodes is disclosed. The battery further comprises a pouch case comprising a case cover and a case body that is formed with a space for receiving the electrode assembly therein and a sealing part that is formed around the space. The sealing part comprises side sealing sections where the width of each side sealing section is less than the depth of the space.