Silver Oxide Button Cell Water Balance for Leak-Free Load Output

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Solution Overview

Problem

Existing button-shaped alkaline batteries face challenges in improving output while avoiding electrolyte leakage and maintaining load characteristics, particularly when increasing the amount of zinc particles or conductive assistants.

Innovation Solution

A button-shaped alkaline battery design that includes a positive electrode with a mixture layer containing silver oxide and carbon black/graphite particles as conductive assistants, an appropriate amount of water (0.63 to 1 g per 1 g of zinc particles), and a battery container configuration that prevents electrolyte leakage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If the amount of water in the battery is increased to improve discharge capacity, then the discharge capacity is improved, but the electrolyte solution tends to leak

Engineering Contradiction:
Improvedischarge capacityVSAvoidelectrolyte leakage
Core Design Contradiction:
Quantity of substanceVSObject-generated harmful factors

Solution Approach 1:

The patent optimizes the water content parameter to a specific range (0.42 to 0.55 g per 1 g of zinc particles) to achieve the best balance between discharge capacity and leakage prevention. This parameter optimization resolves the contradiction by finding the optimal value that satisfies both requirements simultaneously.

Inventive Principle:
Principle #35Parameter changes

2Reliability

If the content of conductive assistant in the positive electrode mixture is increased to improve conductivity, then the conductivity is improved, but the capacity of the battery may decrease

Engineering Contradiction:
ImproveconductivityVSAvoidbattery capacity
Core Design Contradiction:
ReliabilityVSQuantity of substance

Solution Approach 1:

The patent optimizes the conductive assistant content parameter to a specific range (3 to 7% by mass) to achieve the best balance between conductivity and capacity. This parameter optimization resolves the contradiction by finding the optimal value that satisfies both requirements simultaneously.

Inventive Principle:
Principle #35Parameter changes

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 battery achieves excellent load characteristics and high reliability, preventing electrolyte leakage while maintaining discharge capacity and conductivity, making it suitable for medical applications and other high-load uses.

Implementation Method 1

The positive electrode mixture layer contains carbon black and graphite particles as the conductive assistant

Methodology Applied
Scientific EffectElectrical conduction: Conduction (electrical)

Implementation Method 2

an alkaline electrolyte solution

Methodology Applied
Scientific EffectIonic conduction: Conduction (electrical)

Data Source

PatentUS12341205B2Alkaline button cell
Publication Date: 2025.06.24 MAXELL LTD
  • US12341205B2 patent drawing

AI summary

Provided is a highly reliable button-shaped alkaline battery having excellent load characteristics. A button-shaped alkaline battery includes: a positive electrode having a positive electrode mixture layer containing a silver oxide and a conductive assistant; a negative electrode containing zinc particles; an alkaline electrolyte solution; and a battery container for accommodating the positive electrode, the negative electrode, and the alkaline electrolyte solution, the battery container including an outer can, a sealing plate, and a resin gasket. The positive electrode mixture layer contains carbon black and graphite particles as the conductive assistant, and an amount of water in the battery container is 0.63 to 1 g per 1 g of the zinc particles of the negative electrode.