Pouch Battery Case Venting Guide for Controlled Gas Rupture
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Solution Overview
Problem
Existing methods for manufacturing pouch-shaped secondary batteries do not effectively guide the rupture of the battery case 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 involves pressing a laminate sheet with specific dies to create a recess and protrusion configuration that concentrates pressure on a weakened area, allowing the venting guide portion to rupture before the case explodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rupture layer or vulnerable portion is added to guide gas discharge, then battery safety is improved, but manufacturing process complexity increases
Solution Approach 1:
The patent combines the venting guide portion formation with the electrode assembly receiving portion formation in a single pressing operation. The press die simultaneously creates both structural features, eliminating the need for separate rupture layer coating or vulnerable portion creation steps, thus improving safety while maintaining manufacturing simplicity
Solution Approach 2:
The venting guide portion is formed during the initial battery case manufacturing process before the battery is assembled and sealed. This preliminary formation of the pressure concentration structure ensures that the venting function is built-in from the start, avoiding additional steps later in the manufacturing process
2Reliability
If a venting guide portion is formed by additional pressing steps, then gas discharge control is improved, but manufacturing time increases
Solution Approach 1:
The pressing operation that forms the electrode assembly receiving portion is merged with the operation that forms the venting guide portion. A single pressing action creates both features, ensuring gas discharge control capability is built-in without adding manufacturing time
Solution Approach 2:
The press die serves multiple functions: it forms the electrode assembly receiving portion and simultaneously creates the venting guide portion with pressure concentration features. This multi-functionality eliminates the need for separate venting feature creation steps
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 discharges gas before explosion, enhancing safety and simplifying the manufacturing process while reducing costs and improving productivity.
Implementation Method 1
pressing a laminate sheet with specific dies to create a recess and protrusion configuration that concentrates pressure on a weakened area
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.