Alkaline Cell Anode Cathode Ratio for Drain Rate Efficiency
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Solution Overview
Problem
Alkaline electrochemical cells struggle to provide optimal performance across a wide range of discharge conditions, from low drain to high tech devices, while also facing challenges in reducing costs without compromising run time, as existing solutions like the 'jellyroll' construction are not well-suited for devices requiring both high and low drain rates.
Innovation Solution
An alkaline electrochemical cell design featuring a container with a first electrode made of manganese dioxide and a second electrode of zinc, with a specific electrochemical capacity ratio and optimized zinc powder characteristics, including a gelled electrolyte and separator, to maintain efficient discharge performance across varying conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the quantity of electrochemically active material (zinc and manganese dioxide) is reduced to decrease battery cost, then manufacturing cost is reduced, but run time decreases
Solution Approach 1:
The patent optimizes the anode-to-cathode surface area ratio parameter to a specific range (1.2 to 1.5) to achieve optimal discharge efficiency across varying drain rates. This parameter optimization allows the battery to maintain adequate run time while using reduced quantities of electrochemically active materials, thereby resolving the contradiction between manufacturing cost and run time
Solution Approach 2:
The battery design creates a universal cell that performs adequately across multiple discharge conditions (low drain, high drain, and high tech devices) rather than being optimized for a single condition. This multi-functionality allows the battery to maintain acceptable run time across diverse applications while using optimized material quantities, addressing both cost reduction and run time requirements
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 cell achieves high discharge efficiency (minimum 78% to 93%) across different discharge tests, ensuring adequate run times in both high tech and low drain devices, while maintaining cost-effectiveness by optimizing the use of electrochemically active materials.
Implementation Method 1
an alkaline electrochemical cell that is capable of providing optimum service at various discharge conditions
Implementation Method 2
a separator. The area of the interface is between 12.6 cm2 and 13.2 cm2
Implementation Method 3
The first electrode's electrochemical capacity is determined by multiplying the grams of manganese dioxide by 285 mAhr/g. The second electrode's electrochemical capacity is determined by multiplying the grams of zinc by 821 mAhr/g
Data Source
AI summary
An alkaline electrochemical cell capable of providing optimum discharge efficiencies at both a high tech drain rate and a low drain rate is disclosed. In one embodiment, the ratio of the anode's electrochemical capacity to the cathode's electrochemical capacity is between 1.33:1 and 1.40:1 and the surface area of the anode to cathode interface is maximized.