Pouch Battery Venting Block With Needle-Triggered Gas Release
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Pouch-type secondary batteries face challenges in safely venting internal gas during swelling due to their structural limitations, which can lead to increased internal pressure and explosion risks, unlike cylindrical or prismatic batteries that have a gas hole for pressure relief.
Innovation Solution
A gas venting induction block is designed for pouch-type secondary batteries, featuring a block body with a slit and a pocket portion that accommodates the cell terrace, an exhaust pipe with a needle portion to perforate the terrace when it expands, and foam members to prevent damage, allowing gas to be vented in a specific direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gas hole is applied to the top cap as in cylindrical or prismatic secondary batteries, then gas can be discharged to the outside to prevent pressure increase, but pouch-type secondary batteries cannot structurally apply a gas hole due to their sealed pouch structure
Solution Approach 1:
The cell terrace is inserted into the block body through a slit, with the exhaust pipe nested within the block body structure. The needle portion is positioned inside the pocket portion, creating a nested configuration that enables gas venting functionality within the constrained pouch battery structure without requiring external modifications to the pouch sheets.
Solution Approach 2:
The block body acts as an intermediary device between the cell terrace and the external environment. It provides a controlled interface through the slit and pocket portion, allowing the needle portion to perforate the cell terrace and enable gas discharge without directly modifying the pouch battery structure.
2Reliability
If the cell terrace is accommodated in a pocket portion with larger space, then the terrace can expand when gas is generated, but the block body structure becomes more complex
Solution Approach 1:
The block body is divided into distinct functional regions: a slit for insertion, a pocket portion for accommodation and expansion, and an exhaust pipe for gas discharge. This segmentation allows each region to perform its specific function efficiently while maintaining overall structural organization.
Solution Approach 2:
The pocket portion provides three-dimensional space within the block body, allowing the cell terrace to expand in multiple directions rather than being constrained to a flat surface. This dimensional approach accommodates expansion without significantly increasing external dimensions.
3Reliability
If the needle portion protrudes to perforate the cell terrace, then gas can be vented when the terrace expands, but the terrace may be damaged by the protruding needle
Solution Approach 1:
The needle portion is pre-positioned within the pocket portion at a controlled protrusion distance. This preliminary positioning ensures that the needle only contacts and perforates the cell terrace when the terrace expands to the appropriate level, activating gas venting at the correct moment while minimizing unnecessary contact that could cause damage.
Solution Approach 2:
The needle portion has a localized function within the pocket portion, specifically designed to perforate the cell terrace only when needed. The controlled protrusion distance creates a localized interaction zone that minimizes the risk of damage to other parts of the terrace while enabling effective gas venting at the perforation site.
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 reduces the risk of explosion by venting gas in a controlled direction, preventing the pouch-type secondary battery from reaching dangerous pressure levels and facilitating safe gas discharge, thereby enhancing safety and reliability.
Implementation Method 1
an exhaust pipe having a tubular shape and extending from the pocket portion to an outer surface of the block body, wherein the exhaust pipe includes a needle portion protruding toward an inner space of the pocket portion so as to perforate the cell terrace when the cell terrace expands beyond a first volume in the pocket portion
Data Source
AI summary
A gas venting induction block includes a block body having a slit configured to accommodate a cell terrace of a pouch-type secondary battery inserted through the slit to a first distance. The gas venting induction block further includes a pocket portion inside the block body. The pocket portion accommodates a portion of the cell terrace having a space larger than the slit. The gas venting induction block further includes an exhaust pipe having a tubular shape and extends from the pocket portion to an outer surface of the block body. The exhaust pipe includes a needle portion protruding toward an inner space of the pocket portion so as to perforate the cell terrace when the cell terrace expands beyond a first volume in the pocket portion.