Pouch Battery Case Venting Guide for Controlled Pressure Release
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Solution Overview
Problem
Existing methods for forming rupture layers or vulnerable portions in pouch-shaped secondary batteries do not provide a concrete solution to prevent explosion due to internal pressure increases, posing a safety risk.
Innovation Solution
A method of forming a venting guide portion during the manufacturing process of a pouch-shaped battery case, which includes pressing a laminate sheet with specific dies to create a recess and protrusion configuration, allowing the venting guide portion to rupture before the battery case explodes, thereby guiding gas discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rupture layer is formed on the outer surface of the battery case to prevent explosion, then safety is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The venting guide portion is formed during the battery case manufacturing process itself, creating a predetermined weak point before the battery is assembled. This preliminary action eliminates the need for separate rupture layer coating steps, thereby improving safety while avoiding increased manufacturing complexity
Solution Approach 2:
The formation of the venting guide portion is merged with the battery case forming process. The pressing step that creates the battery case shape simultaneously forms the venting guide portion by creating a localized thinning area, combining two functions into one operation
2Reliability
If a vulnerable portion is formed on the sealing portion to allow gas discharge, then safety is improved, but manufacturing precision requirements increase
Solution Approach 1:
The venting guide portion creates a localized area with different thickness properties compared to the rest of the battery case. This local quality change creates a predetermined weak point that will rupture first under pressure, providing controlled gas discharge without requiring high positioning precision across the entire case
3Reliability
If blocking lines are installed to prevent electrolytic solution discharge, then manufacturing safety is improved, but the ability to discharge gas during manufacturing is reduced
Solution Approach 1:
The battery case structure is segmented into two functional zones: the venting guide portion that allows controlled gas discharge, and the blocking lines that prevent electrolytic solution leakage. This segmentation enables both gas venting and manufacturing safety without compromise
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 venting guide portion effectively prevents explosion by concentrating pressure on a specific area to rupture first, simplifying the manufacturing process and enhancing safety without increasing costs or steps.
Implementation Method 1
The venting guide portion effectively prevents explosion by concentrating pressure on a specific area to rupture first
Data Source
AI summary
The present invention relates to a pouch-shaped battery case manufacturing method including (a) locating a laminate sheet for pouch-shaped battery cases on a lower press die, (b) pressing the laminate sheet using an upper press die to form an electrode assembly receiving portion, (c) forming a venting guide portion in the bottom of the electrode assembly receiving portion, and (d) separating a pouch-shaped battery case having the electrode assembly receiving portion and the venting guide portion formed therein from the lower press die.