Pouch Battery Case Laminate With Shape-Memory Swelling Suppression
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Solution Overview
Problem
Pouch-type battery cases face increased risk of explosion due to swelling phenomena as they are designed for higher density and larger capacity, leading to high tensile stress.
Innovation Solution
Incorporation of a shape-memory resin film between the gas barrier and sealant layers in the pouch-type battery case laminate structure, which shrinks significantly at high temperatures to suppress swelling and prevent explosions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the pouch size is increased to achieve higher density and larger capacity, then the battery capacity is improved, but the tensile stress caused by swelling phenomenon increases and the risk of explosion increases
Solution Approach 1:
The shape-memory resin film is pre-installed in the pouch film laminate structure before battery operation. When swelling occurs, the film automatically activates its shrinkage function to counteract the expansion, preventing explosion before it can occur. This preliminary preparation of the safety mechanism resolves the contradiction by having the protective function ready in advance.
Solution Approach 2:
The shape-memory resin film changes its physical parameters (dimensional stability, shrinkage ratio) in response to temperature changes. At normal temperatures, the film maintains its original size, but when exposed to high temperatures indicating swelling, it shrinks by a predetermined ratio to counteract the swelling force, thus managing the harmful effect dynamically.
2Reliability
If a shape-memory resin film is added to suppress swelling, then safety is improved, but the device complexity increases
Solution Approach 1:
The pouch film is constructed as a composite laminate structure integrating multiple functional layers including the shape-memory resin film. This composite approach combines the protective function of the shape-memory material with the structural requirements of the pouch, achieving enhanced safety without requiring separate independent safety systems.
Solution Approach 2:
The shape-memory resin film serves multiple functions simultaneously: it acts as a structural component of the pouch film, provides swelling suppression through its shrinkage mechanism, and functions as a thermal response element. This multi-functionality reduces the need for additional separate safety components, thereby limiting the increase in device complexity.
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 shape-memory resin film effectively suppresses swelling and enhances safety by inducing energy drain during abnormal battery behavior, preventing explosions.
Implementation Method 1
a shape-memory resin film is disposed between the gas barrier layer and the sealant layer
Implementation Method 2
the shrinkable pouch film laminate may be provided in a region excluding the sealing portion
Data Source
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AI summary
A pouch-type battery case according to the present invention includes a shrinkable pouch film laminate in which a base layer, a gas barrier layer, and a sealant layer which are sequentially stacked, and a shape-memory resin film is disposed between the gas barrier layer and the sealant layer.