Lead-Acid Battery Composition for Float-Charge Corrosion Control
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Solution Overview
Problem
Lead-acid batteries face challenges in maintaining the corrosion resistance of positive current collectors during float charging, which affects battery life, and there is a need to balance corrosion resistance with the suppression of electrolyte solution depletion.
Innovation Solution
A lead-acid battery design incorporating a positive electrode plate with a positive current collector having a Ca content of 0.13% by mass or less, combined with a polymer compound that exhibits a peak in the 1H-NMR spectrum between 3.2 ppm and 3.8 ppm, and containing oxy C2-4 alkylene units, which enhances hydrogen overvoltage and suppresses water decomposition reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the Ca content of the positive current collector is increased to improve corrosion resistance, then the battery life during float charging is improved, but the amount of electrolyte solution decreases more rapidly
Solution Approach 1:
The patent changes the chemical composition parameter of the positive current collector by strictly limiting Ca content to 0.13% by mass or less. This parameter change resolves the contradiction by showing that very low Ca content provides sufficient corrosion resistance while preventing electrolyte solution depletion, unlike higher Ca content alloys that cause rapid electrolyte loss
Solution Approach 2:
The patent employs composite material strategy by combining multiple alloying elements (Ca, Sn, Al, Si, Fe, Mn) in specific proportions rather than using pure lead or simple lead-calcium alloys. This composite approach creates a balanced alloy composition that achieves both corrosion resistance and electrolyte retention
2Loss of substance
If the Ca content of the positive current collector is reduced to suppress electrolyte solution depletion, then the amount of electrolyte solution is maintained, but the corrosion resistance of the positive current collector deteriorates
Solution Approach 1:
The patent uses composite material strategy by combining multiple alloying elements (Ca, Sn, Al, Si, Fe, Mn) in specific proportions rather than using pure lead or simple lead-calcium alloys. This composite approach creates a balanced alloy composition that achieves both corrosion resistance and electrolyte retention
Solution Approach 2:
The patent changes the chemical composition parameter of the positive current collector by strictly limiting Ca content to 0.13% by mass or less. This parameter change resolves the contradiction by showing that very low Ca content provides sufficient corrosion resistance while preventing electrolyte solution depletion, unlike higher Ca content alloys that cause rapid electrolyte loss
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 significantly improves the battery's life during float charging by reducing corrosion of the positive current collector and slowing down electrolyte solution depletion, leading to extended battery durability.
Implementation Method 1
it has been found that when a polymer compound is contained and a Ca content is 0.13% by mass or less, liquid decrease can be suppressed
Implementation Method 2
the polymer compound has a peak in a range of 3.2 ppm or more and 3.8 ppm or less in a chemical shift of 1H-NMR spectrum... enhances hydrogen overvoltage and suppresses water decomposition reactions
Data Source
AI summary
A lead-acid battery includes a positive electrode plate, a negative electrode plate, an electrolyte solution, and a polymer compound, in which the positive electrode plate includes a positive current collector and a positive electrode material, the negative electrode plate includes a negative current collector and a negative electrode material, the Ca content of the positive current collector is 0.13% by mass or less, and the polymer compound has a peak in a range of 3.2 ppm or more and 3.8 ppm or less in a chemical shift of 1H-NMR spectrum, or the polymer compound contains a repeating structure of oxy C2-4 alkylene units.