Battery Packaging Structure for H2S Barrier and Seal Insulation
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Solution Overview
Problem
All-solid-state batteries using existing packaging materials face issues with hydrogen sulfide gas leakage due to reactions with moisture and the loss of insulating properties when the sealant layer is thermally bonded, leading to reduced insulation and potential gas leakage.
Innovation Solution
A packaging material for all-solid-state batteries is designed with a heat-resistant gas barrier layer made of a resin with low hydrogen sulfide gas permeability, interposed between the metal foil and sealant layers, ensuring the hydrogen sulfide gas is prevented from leaking and maintaining insulating properties even when the sealant layer melts during thermal bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a sealant layer is used for thermal bonding to encapsulate the battery main body, then sealing and bonding properties are improved, but the sealant layer melts and flows out during thermal bonding, causing the layer to become partially thin and lose protective function, decreasing insulation properties
Solution Approach 1:
A heat-resistant protective layer is introduced as an intermediary between the sealant layer and the metal foil layer. This protective layer acts as a mediator that prevents the sealant layer from directly contacting and potentially short-circuiting the metal foil during thermal bonding, while still allowing the sealant layer to perform its sealing function. The protective layer maintains its structural integrity at bonding temperatures, ensuring continuous insulation protection.
Solution Approach 2:
The packaging material employs a composite structure consisting of multiple layers with different functions: a heat-resistant protective layer (made of materials like polyimide or polyethylene terephthalate with high heat resistance) laminated on the metal foil layer, and the sealant layer (made of heat-fusible resin) positioned to perform thermal bonding. This composite structure combines the heat resistance of the protective layer with the sealing capability of the sealant layer, resolving the contradiction between ease of manufacture and reliability.
2Object-generated harmful factors
If a sealant layer with high hydrogen sulfide gas permeability is used, then gas release is improved, but hydrogen sulfide gas generated inside the battery may leak out
Solution Approach 1:
The heat-resistant protective layer serves as a barrier between the battery interior and exterior environment. It has low hydrogen sulfide gas permeability, acting as a protective shield that prevents generated hydrogen sulfide gas from leaking out while still allowing controlled release through designated pathways, thus resolving the contradiction between gas release and gas leakage prevention.
3Reliability
If the sealant layer is thermally bonded to encapsulate the battery main body, then sealing performance is improved, but the resin constituting the sealant layer melts and flows out, causing the sealant layer to become partially thin and lose protective function
Solution Approach 1:
The heat-resistant protective layer is positioned between the sealant layer and the metal foil layer to act as a mediator during thermal bonding. When the sealant layer melts and flows out to achieve sealing, the protective layer prevents direct contact with the metal foil and maintains its own structural integrity, ensuring that the sealant layer retains sufficient thickness and protective function even after thermal bonding.
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 packaging material effectively prevents hydrogen sulfide gas leakage and maintains sufficient insulating properties, ensuring the integrity and safety of the all-solid-state battery by using a heat-resistant gas barrier layer with specified permeability and thickness, which complements the sealant layer's functionality.
Implementation Method 1
the resin constituting the heat-resistant gas barrier layer has a specific hydrogen sulfide gas permeability
Implementation Method 2
when the sealant layer is fusion bonded (thermally adhered) when encapsulating the battery main body, the resin constituting the sealant layer melts and flows out
Data Source
AI summary
A packaging material for all-solid-state batteries includes a substrate layer, a metal foil layer laminated on an inner surface side of the substrate layer, and a sealant layer laminated on an inner surface side of the metal foil layer. A solid-state battery body is encapsulated by the packaging material. The heat-resistant gas barrier layer is provided between the metal foil layer and the sealant layer. The heat-resistant gas barrier layer is constituted by a resin having hydrogen sulfide gas permeability of 15 {cc·mm/(m2·D·MPa)} or less as measured in accordance with JIS K7126-1.