Solid-State Battery Electrode Layout for Reliable End-Face Contact
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Solution Overview
Problem
Connection failure between electrode layers and end face electrodes in solid state batteries is prevalent, leading to deterioration of battery characteristics, particularly when current collector layers are omitted.
Innovation Solution
The solid state battery design incorporates electrode layers with protruding end portions that electrically connect to end face electrodes, eliminating the need for current collector members and enhancing electrical contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If current collector layers are omitted to improve energy density, then battery energy density is improved, but connection failure between electrode layers and end face electrodes occurs
Solution Approach 1:
The electrode layer end portions are extended in the horizontal direction (another dimension) to protrude toward the end face electrodes, creating overlapping contact areas that improve connection reliability without requiring current collector layers
Solution Approach 2:
The electrode layers are pre-formed with protruding end portions during the lamination process, ensuring proper electrical connection is established before battery operation begins, eliminating the need for separate current collector components
2Reliability
If extraction portions are added to end face electrodes to improve connection, then connection reliability is improved, but device complexity increases
Solution Approach 1:
Instead of modifying the end face electrodes with extraction portions, the invention inverts the approach by making the electrode layers themselves protrude toward the end face electrodes, simplifying the overall structure while achieving the same connection reliability improvement
Data Source
AI summary
A solid state battery having: a laminated structure in which one or more positive electrode layers and one or more negative electrode layers are alternately laminated with a solid electrolytic layer interposed in between; a positive end face electrode on a first end face of the laminated structure; and a negative end face electrode on a second end face of the laminated structure, wherein (1) at least one of the one or more positive electrode layers has an end portion having a protruding shape protruding toward the positive end face electrode in a sectional view and electrically connected to the positive end face electrode, or (2) at least one of the one or more negative electrode layers has an end portion having a protruding shape protruding toward the negative end face electrode in the sectional view and electrically connected to the negative end face electrode.