Solid-State Battery Electrode Protrusions for End-Face Connection

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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 in configurations without current collector layers.

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

VSEngineering Contradiction Analysis

1Quantity of substance

If current collector layers are omitted to improve energy density, then energy density is improved, but connection reliability between electrode layers and end face electrodes deteriorates

Engineering Contradiction:

Improveenergy densityVSAvoidconnection reliability

Core Design Contradiction:

Quantity of substanceVSReliability

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

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The end portions of the electrode layers are formed with curved surfaces (inclined or arc-shaped) instead of flat surfaces, increasing the contact area with the end face electrodes and suppressing connection failure

Inventive Principle:

Principle #14Spheroidality (Curvature)

2Reliability

If extraction portions are added to end face electrodes to improve connection, then connection area is increased, but manufacturing complexity increases

Engineering Contradiction:

Improveconnection reliabilityVSAvoidmanufacturing complexity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

Instead of modifying the end face electrodes with extraction portions, the invention inverts the approach by extending the electrode layer end portions themselves to protrude and make contact with the end face electrodes, simplifying the manufacturing process

Inventive Principle:

Principle #13The other way round (Inversion)

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 suppresses connection failure and improves energy density by ensuring stable electrical connections without current collectors, thereby enhancing battery performance.

Implementation Method 1

a solid electrolytic layer interposed between a positive electrode layer and a negative electrode layer

Methodology Applied

Scientific EffectIon conduction: Conduction (electrical)

Implementation Method 2

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

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Data Source

PatentUS20260066355A1Solid state battery

Publication Date: 2026.03.05 MURATA MFG CO LTD

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.