Alkaline Battery Anode Composition for Stable OCV Measurement
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Solution Overview
Problem
Alkaline batteries experience a temporary decrease in open circuit voltage during measurement, leading to non-defective products being erroneously determined as defective, which increases manufacturing costs and can result in product reliability issues.
Innovation Solution
The alkaline battery design includes a negative electrode with zinc alloy powder, a gelling agent, a surface active agent, and electrolyte, where the zinc alloy powder has a specific proportion passing through a 75 μm mesh (9-28 mass %), a bulk density of 2.7-3.2 g/cm3, and a content of 60-64 mass % in the negative electrode, preventing temporary voltage drops by maintaining conductive paths and preventing corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional zinc alloy powder is used in the negative electrode, then the battery can be manufactured with standard materials, but temporary OCV decreases occur leading to misclassification of non-defective batteries as defective
Solution Approach 1:
The patent applies parameter changes by precisely controlling the particle size distribution (9-28 mass% passing through 75 μm mesh) and bulk density (2.7-3.2 g/cm³) of the zinc alloy powder. These parameter optimizations prevent temporary OCV decreases while maintaining standard manufacturing processes, resolving the contradiction between measurement accuracy and manufacturing cost.
2Volume of stationary object
If the zinc alloy powder has higher bulk density, then the negative electrode can be more compact, but the conductive path stability decreases leading to voltage drops
Solution Approach 1:
The patent optimizes the bulk density parameter to a specific range (2.7-3.2 g/cm³) that balances compactness and conductive path stability. This parameter control ensures the negative electrode achieves adequate density while maintaining stable electrical conductivity, preventing temporary voltage drops.
Solution Approach 2:
The patent applies local quality by controlling the particle size distribution within specific ranges (9-28 mass% through 75 μm mesh). This creates an optimized local structure within the negative electrode that maintains both compactness and conductive path stability, resolving the contradiction between volume reduction and reliability.
3Volume of stationary object
If the proportion of fine particles (passing through 75 μm mesh) is increased, then the negative electrode density increases, but the OCV stability decreases
Solution Approach 1:
The patent precisely controls the particle size distribution parameter, specifying that 9-28 mass% of the zinc alloy powder should pass through a 75 μm mesh. This optimized parameter range achieves adequate electrode density while maintaining OCV stability, preventing temporary voltage drops during measurement.
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
This configuration effectively prevents temporary OCV decreases, ensuring non-defective batteries are not misclassified as defective, thereby reducing manufacturing costs and enhancing product reliability by maintaining stable conductive paths and preventing corrosion.
Implementation Method 1
the gelling agent contains a water-absorbing resin having a water absorption capacity for the alkaline electrolyte (water absorption capacity for 40 mass % potassium hydroxide solution) of greater than or equal to 37 times
Implementation Method 2
maintaining conductive paths and preventing corrosion
Data Source
AI summary
An alkaline battery includes a positive electrode, a negative electrode, and a separator. The negative electrode includes zinc alloy powder, gelling agent, surface active agent, and electrolyte. The zinc alloy powder includes zinc alloy particles. A proportion of the zinc alloy particles with respect to zinc alloy powder that passes through a mesh having an aperture width of 75 μm ranges from 9 mass % to 28 mass %. The zinc alloy powder has a bulk density ranging from 2.7 g/cm3 to 3.2 g/cm3. A content of the zinc alloy powder in the negative electrode ranges from 60 mass % to 64 mass %.