Solid-State Battery Reference Electrode Layout for Accurate Measurement

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Solution Overview

Problem

Existing solid-state battery configurations for three-electrode measurement are complex and require precise work to form a reference electrode, making it difficult to measure electrical characteristics of each electrode effectively.

Innovation Solution

A battery structure with a power generating element and a reference electrode section, where the reference electrode is in contact with a second solid electrolyte layer having a main surface longer than the side surface of the power generating element, allowing easy formation and accurate measurement of electrical characteristics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a three-electrode measurement configuration is implemented in a solid-state battery, then electrical characteristics of each electrode can be measured, but the battery structure becomes complicated and formation of the reference electrode requires precise work

Engineering Contradiction:

Improveelectrical characteristic measurementVSAvoidbattery structure

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The battery is divided into a power generating element and a reference electrode section, with the reference electrode section being integrally formed with the power generating element. This segmentation allows the reference electrode to be positioned separately on the side surface, simplifying the overall structure while maintaining measurement capability

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The reference electrode section is integrally formed with the power generating element, merging two functional components into a single manufactured unit. This reduces assembly complexity and ensures proper positioning without requiring separate installation of the reference electrode

Inventive Principle:

Principle #5Merging (Combining)

2Measurement precision

If the reference electrode is formed with precise work, then measurement accuracy is improved, but manufacturing difficulty increases

Engineering Contradiction:

Improveelectrical characteristic measurementVSAvoidreference electrode formation

Core Design Contradiction:

Measurement precisionVSEase of manufacture

Solution Approach 1:

The reference electrode section is integrally formed with the power generating element during the same manufacturing process, rather than being added separately after battery assembly. This preliminary action ensures proper positioning and contact while simplifying the manufacturing process

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

A solid electrolyte layer is used as an intermediary between the reference electrode and the power generating element, providing a simple and reliable contact interface that does not require complex formation processes

Inventive Principle:

Principle #24Intermediary (Mediator)

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

Enables easy and stable measurement of electrical characteristics of each electrode, improving measurement accuracy and mechanical strength while allowing for dynamic battery control during operation.

Implementation Method 1

a first solid electrolyte layer that is located between the first electrode layer and the second electrode layer

Methodology Applied

Scientific EffectIon conduction: Conduction (electrical)

Implementation Method 2

a reference electrode in contact with the second main surface of the second solid electrolyte layer

Methodology Applied

Scientific EffectElectrochemical measurement:

Data Source

PatentUS12537224B2Battery, battery exterior, and measurement method

Publication Date: 2026.01.27 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

AI summary

A battery includes: a power generating element including a first electrode layer, a second electrode layer, and a first solid electrolyte layer located between the first electrode layer and the second electrode layer; and a reference electrode section including a second solid electrolyte layer having a first main surface in contact with a side surface of the power generating element and a second main surface opposite to the first main surface, and a reference electrode in contact with the second main surface of the second solid electrolyte layer, in which a length of the first main surface is longer than a length of the side surface in a laminating direction in the power generating element.