Solid-State Battery Packaging Film for Bubble-Free Heat Sealing
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Solution Overview
Problem
The use of laminate films as substrate layers in solid-state battery packaging materials can lead to air bubbles during heat sealing, causing lifting and reducing chemical and scratch resistance, which affects the reliability of the packaging material.
Innovation Solution
A solid-state battery packaging material with a substrate layer composed of at least two biaxially stretched resin films, each with a water content of 4000 mass ppm or less, and a sealant layer with a melting point of 150°C or higher, to prevent air bubble formation and maintain adhesion during high-temperature heat sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a laminate film is used as a substrate layer to achieve better deep drawing formability and larger battery capacity, then formability is improved, but air bubbles are generated during heat sealing causing lifting and reducing reliability
Solution Approach 1:
The patent applies parameter changes by controlling the water content of the resin film to 4000 mass ppm or less. This parameter control prevents moisture evaporation during heat sealing, thereby preventing air bubble generation and lifting while maintaining the laminate structure's formability advantages.
Solution Approach 2:
The patent implements preliminary action by pre-drying the resin film to reduce water content to 4000 mass ppm or less before the heat sealing process. This preliminary moisture removal prevents air bubble formation during subsequent heat sealing, ensuring both formability and reliability are achieved.
2Reliability
If heat sealing is performed at high temperature to prevent moisture evaporation and air bubble formation, then reliability is improved, but the sealant layer may degrade or the substrate layer may still experience lifting
Solution Approach 1:
The patent changes the water content parameter to 4000 mass ppm or less, which allows heat sealing to be performed at lower temperatures without causing moisture evaporation. This resolves the contradiction by enabling reliable sealing at temperatures that do not degrade the sealant layer or cause substrate lifting.
3Reliability
If the water content in the resin film is reduced to prevent air bubble formation during heat sealing, then reliability is improved, but the resin film may become more brittle and less formable
Solution Approach 1:
The patent optimizes the water content parameter to 4000 mass ppm or less, which prevents air bubble formation during heat sealing while maintaining the resin film's formability. This optimal parameter range resolves the contradiction by eliminating the need to choose between reliability and formability.
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 prevents lifting in the substrate layer during heat sealing, ensuring good formability and reliability of the packaging material, even under high-temperature conditions, and maintains the sealed state of the packaging bag.
Implementation Method 1
when a packaging material is heat sealed at high temperature, moisture in resin films constituting a substrate layer of the packaging material may be rapidly evaporated and remain between the resin films even after cooling
Implementation Method 2
heat sealing packaging materials at high temperature
Data Source
AI summary
A solid-state battery packaging material including at least a substrate layer, a barrier layer, and a sealant layer in this order. The substrate layer includes at least two biaxially stretched resin films, and one or more of the at least two resin films other than an outermost layer have a water content of 4000 mass ppm or less.