Solid-state Battery Solder Film Moisture Barrier
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Solution Overview
Problem
Solid-state batteries face the challenge of moisture entry through external electrodes, which can compromise their functionality due to minute voids in the electrode structure and potential plating solution residues.
Innovation Solution
A solid-state battery design featuring a solder film covering the external electrode and a holding terminal that supports the electrode with the solder film, preventing moisture ingress and ensuring the battery's integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a plating treatment is applied to the external electrode surface, then the external electrode gains improved surface properties and connectivity, but moisture may remain in minute voids of the external electrode and enter the battery element
Solution Approach 1:
A solder film is introduced as an intermediary layer between the external electrode and the plating solution. The solder film covers the external electrode surface and acts as a barrier that prevents plating solution and moisture from penetrating into the minute voids of the external electrode, while still allowing the external electrode to perform its electrical connectivity function
Solution Approach 2:
The solder film functions as a thin film barrier that conformally covers the external electrode surface, including its minute voids and irregularities. This thin film structure effectively seals the external electrode against moisture ingress while maintaining the electrode's electrical properties
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
This configuration effectively prevents moisture from entering the battery element, maintaining the battery's functionality and characteristics, as the solder film acts as a water vapor transmission barrier.
Implementation Method 1
the solder film acts as a water vapor transmission barrier
Data Source
AI summary
A solid-state battery that includes: a battery element that includes, along a lamination direction, one or more battery constituent units each having a positive electrode layer, a negative electrode layer, and a solid electrolyte layer interposed between the positive electrode layer and the negative electrode layer; an external electrode joined to an end of the battery element; a solder film covering a surface of the external electrode; and a holding terminal that holds the external electrode with the solder film.