All-Solid-State Battery Pouch Using Water-Curable Adhesive Film
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Solution Overview
Problem
Conventional pouches for all-solid-state batteries face issues with internal short circuits due to adhesive melting at high temperatures and the generation of flammable gases when exposed to external impacts, such as foreign substance penetration, which can lead to safety hazards.
Innovation Solution
A pouch design featuring a metal layer with an inner adhesive layer composed of a nonwoven fabric impregnated with a water-curable adhesive, providing adhesion and preventing short circuits and gas generation by forming a protective film on the electrolyte surface upon exposure to water and oxygen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a silicone-based adhesive is applied inside the metal layer to provide adhesion, then adhesion between the battery assembly and metal layer is improved, but the adhesive melts at high temperature causing internal short circuit
Solution Approach 1:
The patent changes the chemical composition and thermal properties of the adhesive from silicone-based to water-curable adhesive with glass transition temperature of 100°C or higher. This parameter change in the adhesive material resolves the contradiction by maintaining adhesion strength while preventing melting at high temperatures that would cause short circuits.
Solution Approach 2:
The patent uses a composite structure consisting of nonwoven fabric impregnated with water-curable adhesive. This composite material combines the adhesive properties needed for bonding with the thermal stability of the cured adhesive system, preventing both adhesion failure and thermal runaway.
2Productivity
If a sulfide-based solid electrolyte is used in the pouch-type all-solid-state battery, then battery performance is improved, but exposure to oxygen or water generates hydrogen sulfide gas which is flammable
Solution Approach 1:
The patent introduces a protective film as an intermediary barrier between the sulfide-based solid electrolyte and the external environment (oxygen and water). This film allows the high-performance electrolyte to function while preventing harmful reactions that would generate flammable hydrogen sulfide gas.
Solution Approach 2:
The protective film is applied in advance to prevent the harmful reaction between the solid electrolyte and moisture/oxygen before contact occurs. This preliminary protective measure stops the generation of flammable gas before it can happen, while allowing the battery to operate at full performance.
3Temperature
If the pouch is exposed to high temperature, then thermal runaway risk is reduced, but the adhesive melts causing internal short circuit
Solution Approach 1:
The patent changes the thermal parameters of the adhesive system by selecting a water-curable adhesive with glass transition temperature of 100°C or higher. This parameter change ensures the adhesive maintains its structural integrity and adhesive properties even when exposed to high temperatures that could trigger thermal runaway, preventing both safety issues.
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
Prevents internal short circuits and suppresses the generation of flammable gases, enhancing the safety and stability of all-solid-state batteries under high temperature and impact conditions.
Implementation Method 1
a film is immediately formed on the surface of the electrolyte, thereby suppressing chain reaction due to water and generation of flammable gas
Implementation Method 2
an inner adhesive layer configured to provide adhesion between the metal layer and the battery assembly. The inner adhesive layer comprises a nonwoven fabric impregnated with a water-curable adhesive
Data Source
AI summary
A pouch for an all-solid-state battery with enhanced stability and a pouch cell including the same, in which the pouch for an all-solid-state battery and a battery assembly can be attached to each other using a nonwoven fabric impregnated with a water-curable adhesive. This configuration prevents internal short circuits in the pouch cell and minimizes the generation of flammable gas, thereby significantly improving safety characteristics.