Cylindrical Alkaline Battery Electrode Packing Density Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Cylindrical alkaline batteries face challenges in achieving balanced packing densities and thickness ratios of electrodes, leading to suboptimal discharge performance due to physical and structural constraints, which limits their electrical capacity and reliability.
Innovation Solution
The battery design incorporates a positive electrode with a manganese dioxide packing density of 2.8 to 3 g/cm³ and a negative electrode with a zinc or zinc alloy packing density of 2 to 2.3 g/cm³, with specific relational formulas governing the thickness ratios of the electrodes to achieve balanced discharge performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the packing density of manganese dioxide in the positive electrode is increased, then the electrical capacity of the battery is improved, but the balance between positive and negative electrodes deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the packing density of manganese dioxide within the range of 2.8 to 3.0 g/cm³ and the packing density of zinc within 2.0 to 2.3 g/cm³. It also controls the thickness ratio Tp/Tn between 0.63 to 0.77, thereby optimizing the balance between electrode capacities while maximizing electrical capacity.
2Quantity of substance
If the packing density of zinc in the negative electrode is increased, then the electrical capacity is improved, but the discharge performance balance deteriorates
Solution Approach 1:
The patent optimizes the packing density of zinc to be within 2.0 to 2.3 g/cm³ and controls the thickness ratio Tp/Tn between 0.63 to 0.77. This parameter optimization ensures balanced discharge performance while maximizing the electrical capacity contributed by the negative electrode.
3Reliability
If the thickness ratio of positive to negative electrode is adjusted, then the discharge performance is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent establishes a specific thickness ratio Tp/Tn between 0.63 to 0.77 as an optimized parameter range. This standardized parameter range simplifies manufacturing by providing clear design guidelines while ensuring balanced discharge performance across different battery applications.
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 approach enhances the packing densities and balances the electrode ratios, resulting in improved discharge performance for both low-load and high-load conditions, ensuring efficient and reliable operation while maintaining production feasibility.
Implementation Method 1
an alkaline electrolyte
Data Source
Figure 1~2
Figure 3~5
AI summary
Provided is a cylindrical alkaline battery in which the packing density Dc of the manganese dioxide in the positive electrode is 2.8 to 3.0 g/cm3 and the packing density Da of zinc or a zinc alloy in the negative electrode is 2.0 to 2.3 g/cm3. The packing density Dc of the manganese dioxide, the packing density Da of the zinc or zinc alloy, the thickness Tc of the positive electrode in a radial direction, and the thickness Ta of the negative electrode in a radial direction satisfy one of the following relational formulas (1) to (3): -1.975×Tc/Ta+2.745<Dc/Da<-1.690×Tc/Ta+2.734 -11.652×Tc/Ta2+14.470×Tc/Ta-3.095<Dc/Da<11.652×Tc/Ta2-18.420×Tc/Ta+8.585 -8.895×Tc/Ta2+12.864×Tc/Ta-3.258<Dc/Da<8.895×Tc/Ta2-16.244×Tc/Ta+8.726