Laminate Solid-State Battery Casing for Wrinkle-Free Sealing
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Solution Overview
Problem
Conventional laminate type solid-state batteries face issues with wrinkles, cracks, and impaired sealing performance due to the expansion of electrode laminates during charging and discharging, which can lead to insufficient welding and compromised insulation at the laminate end surfaces.
Innovation Solution
The use of insulating members with inclined surfaces that form an angle greater than 90° and less than 180° with the electrode laminate surfaces, along with a H2S and/or H2O absorbent material between the insulating member and the welding portion, to prevent water intrusion and stress concentration, thereby enhancing accommodation and sealing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If insulating members with square shape are arranged at end portions of the electrode laminate, then insulation is provided at the end surfaces, but wrinkles or cracks may occur in corner portions and sealing performance may be impaired due to stress concentration
Solution Approach 1:
The insulating member is designed with a curved surface instead of sharp corners, where the surface forming an angle with the electrode laminate transitions from an acute angle to an obtuse angle (greater than 90 degrees). This curvature eliminates stress concentration points that would otherwise occur at sharp corners, preventing wrinkles and cracks in the sealing structure while maintaining insulation performance.
2Ease of manufacture
If the insulating member has a square shape with sharp corners, then manufacturing is simple, but welding portions may become insufficient and sealing performance may be impaired during battery operation
Solution Approach 1:
The insulating member features a curved surface design where the angle between the insulating member surface and the electrode laminate surface is greater than 90 degrees. This obtuse angle configuration distributes stress evenly during welding and battery operation, preventing welding deficiencies and sealing failures while remaining manufacturable through standard molding processes.
3Device complexity
If conventional insulating members are used, then the structure is simple, but the electrode laminate expansion during charging and discharging may cause insufficient welding and impaired sealing
Solution Approach 1:
The insulating member is designed with a curved surface that forms an obtuse angle (greater than 90 degrees) with the electrode laminate surface. This curved geometry provides accommodation space for electrode laminate expansion during charging and discharging cycles, preventing stress concentration that would lead to welding failures and sealing impairment, while maintaining structural simplicity.
Data Source
AI summary
To provide a laminate type solid-state battery capable of preferably accommodating an electrode laminate. A laminate type solid-state battery comprising: an electrode laminate; and a casing body being formed of a laminate film and accommodating the electrode laminate, the casing body comprising an insulating member in an interior thereof, the insulating member abutting at least one of laminate end surfaces of the electrode laminate, the insulating member having an inclined surface that outwardly inclines from the electrode laminate in a cross-sectional view along the laminate direction, the inclined surface and the laminate surface of the electrode laminate forming an angle greater than 90° and less than 180°.