Solid-State Battery Electrode Layout for Stress-Resistant Electrolyte Edges

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Solution Overview

Problem

Solid-state batteries face issues with crack generation due to stress from active material expansion during charging, which can lead to moisture intrusion and battery deterioration.

Innovation Solution

A solid-state battery design featuring a configuration where terminal non-connection parts of the electrode layers are surrounded by an insulating part or solid electrolyte part, with a reduced contact area to minimize stress on these regions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the solid electrolyte layer is provided without gap between electrode layers and in contact with side parts of electrode layers, then the battery structure is compact and connection is improved, but stress concentration occurs during charging causing crack generation

Engineering Contradiction:

Improvebattery connection reliabilityVSAvoidsolid electrolyte layer strength

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The side part of the electrode layer is divided into terminal connection part and terminal non-connection part. The solid electrolyte layer is selectively provided to contact only the terminal non-connection part, segmenting the contact regions to avoid continuous stress paths that would lead to cracking.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the electrode layer are treated differently: the terminal connection part maintains direct contact with solid electrolyte for reliable electrical connection, while the terminal non-connection part has controlled contact to minimize stress concentration. This local differentiation optimizes both connection reliability and crack prevention.

Inventive Principle:

Principle #3Local quality

2Productivity

If the active material layer expands during charging, then ion movement and charging capacity are improved, but stress is generated on the solid electrolyte layer causing crack generation

Engineering Contradiction:

Improvecharging capacityVSAvoidsolid electrolyte layer integrity

Core Design Contradiction:

ProductivityVSStrength

Solution Approach 1:

The terminal connection part is extracted from the contact region with the solid electrolyte layer. By removing this vulnerable region from direct contact, the design allows the active material layer to expand freely during charging without generating stress on the solid electrolyte, while still maintaining necessary electrical connections through the terminal.

Inventive Principle:

Principle #2Taking out (Extraction)

3Reliability

If cracks are generated at the peripheral edge of the solid electrolyte layer, then moisture intrusion occurs causing battery deterioration, but preventing cracks requires reduced contact area

Engineering Contradiction:

Improvebattery protection against moistureVSAvoidcontact area between solid electrolyte and electrode

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The contact area between solid electrolyte and electrode is segmented by excluding the terminal connection part. This creates discrete contact zones at the terminal non-connection part, reducing the continuous contact area that would be susceptible to crack propagation and moisture intrusion.

Inventive Principle:

Principle #1Segmentation

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 design effectively reduces stress on the insulating and electrolyte parts, preventing crack generation and ensuring suitable charging and discharging of the battery.

Implementation Method 1

a solid electrolyte layer 20′ interposed between the positive electrode layer 10A′ and the negative electrode layer 10B′

Methodology Applied

Scientific EffectIon conduction: Conduction (electrical)

Implementation Method 2

the active material layer of each electrode layer can expand due to the active material as a constituent element of the active material layer, with the movement of ions through the solid electrolyte between the positive electrode layer 10A′ and the negative electrode layer 10B′ at the time of charging

Methodology Applied

Scientific EffectThermal expansion: Thermal Expansion

Data Source

PatentUS12500317B2Solid-state battery

Publication Date: 2025.12.16 MURATA MFG CO LTD

AI summary

A solid-state battery that includes at least one battery constituent unit including a positive electrode layer, a negative electrode layer, and a solid electrolyte layer interposed between the positive electrode layer and the negative electrode layer, wherein each of the positive electrode layer and the negative electrode layer includes a side part having a terminal connection part and a terminal non-connection part; and an insulating part or a solid electrolyte part surrounding at least a part of the terminal non-connection part of at least one of the positive electrode layer and the negative electrode layer in a planar view of the at least one battery constituent unit such that the insulating part or the solid electrolyte part is in direct contact with the terminal non-connection part in a contact region and out of direct contact with the terminal non-connection part in a non-contact region.