Button Cell Electrolyte Balance for Leak-Free High-Load Output
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Solution Overview
Problem
Existing button-shaped alkaline batteries face issues with electrolyte leakage and degraded load characteristics when attempting to increase electrolyte content or conductive assistant content beyond certain ranges, leading to assembly failures and reduced discharge capacity.
Innovation Solution
A button-shaped alkaline battery design with specific proportions of zinc particles, electrolyte solution, and conductive assistants, including granular silver oxide and carbonaceous materials, is configured to maintain optimal water content and minimize resistance, ensuring effective sealing and improved load characteristics.
Engineering Contradictions & Design Principles
Engineering 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 leaks
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 simultaneously achieve high discharge capacity and prevent electrolyte leakage. This parameter optimization resolves the contradiction by finding the optimal balance point where both requirements are satisfied.
2Reliability
If the content of conductive assistant in positive electrode mixture is increased to improve load characteristics, then the conductivity is improved, but the proportion of positive electrode active material decreases and load characteristics degrade
Solution Approach 1:
The patent optimizes the conductive assistant content parameter to a specific range (3 to 7% by mass) to achieve the best load characteristics. This parameter optimization resolves the contradiction by finding the optimal balance between conductivity enhancement and maintaining sufficient active material proportion.
3Quantity of substance
If the amount of zinc particles filled inside sealing plate is increased to improve discharge capacity, then the discharge capacity is improved, but the airspace in battery container decreases and leakage is more likely to occur
Solution Approach 1:
The patent optimizes the zinc particle filling amount and controls the water content within specific ranges to simultaneously achieve high discharge capacity and prevent electrolyte leakage. This parameter optimization resolves the contradiction by finding the optimal balance between maximizing active material and maintaining sufficient airspace.
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 reliable performance with reduced leakage and enhanced load characteristics, suitable for medical applications requiring high output and stability.
Implementation Method 1
a negative electrode containing zinc particles or zinc alloy particles... facilitate discharge reactions
Implementation Method 2
the content of a conductive assistant in a positive electrode mixture is adjusted... reduce internal resistance
Data Source
Figure 1
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.