Microporous Lead-Acid Battery Separator Coatings for Lower Water Loss
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Solution Overview
Problem
Lead acid batteries experience voltage reductions and water loss over time due to water electrolysis, leading to reduced battery capacity, grid corrosion, and eventual failure. Existing methods, such as adding zinc compounds to the electrolyte, are difficult to implement in commercial settings and depend on the functional coating of the separator.
Innovation Solution
The development of a microporous separator with improved functional coatings, including surfactants and metal salts like ZnSO4, which reduces water loss, float charge current, and internal resistance, while enhancing wettability and acid diffusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If zinc compounds are added to the electrolyte to reduce water loss, then water loss is reduced, but manufacturing complexity increases and implementation becomes difficult in commercial settings
Solution Approach 1:
The patent extracts zinc compounds from the electrolyte and incorporates them directly into the separator structure. The separator is manufactured with zinc compounds integrated into its matrix or coating, eliminating the need to add zinc compounds to the electrolyte separately. This extraction of the additive from the electrolyte system and integration into the separator resolves the manufacturing complexity issue while maintaining the water loss reduction benefit.
Solution Approach 2:
The patent applies preliminary action by pre-incorporating zinc compounds into the separator during the separator manufacturing process, before the battery is assembled and filled with electrolyte. This preliminary integration ensures the zinc compounds are already in position to reduce water loss from the outset, eliminating the need for subsequent electrolyte modification steps in commercial manufacturing.
2Reliability
If float charge is increased to maintain battery voltage, then battery voltage is maintained, but water electrolysis and water loss increase
Solution Approach 1:
The patent converts the harmful effect of float charge (which causes water electrolysis) into a beneficial outcome. By incorporating zinc compounds into the separator, the patent enables the float charge current to be reduced while maintaining battery voltage stability. The zinc compounds suppress the electrolysis reaction that normally occurs during float charging, thereby converting the previously harmful high float charge condition into a beneficial low water loss condition.
3Loss of substance
If separator functional coating is improved to reduce water loss, then water loss is reduced, but manufacturing process complexity increases
Solution Approach 1:
The patent merges the functional coating step with the separator manufacturing process itself. Instead of applying zinc compound coatings as a separate post-manufacturing step, the zinc compounds are incorporated into the separator during its formation process. This merging of steps integrates the functional coating into the base manufacturing process, reducing overall process complexity while achieving the water loss reduction benefit.
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 improved separator effectively reduces water loss by more than 10%, lowers float current, and minimizes internal resistance increase, thereby extending battery life and reducing failure rates.
Implementation Method 1
water that is present in the electrolyte can be reversibly split into hydrogen and oxygen gas, especially during periods of overcharge
Implementation Method 2
addition of zinc compounds to either the grid material or electrolyte reduces the float current
Implementation Method 3
microporous separator with improved functional coatings, including surfactants and metal salts
Implementation Method 4
improving acid diffusion
Data Source
AI summary
Disclosed herein are novel or improved separators, battery separators, lead acid battery separators, batteries, cells, and/or methods of manufacture and/or use of such separators, battery separators, lead acid battery separators, cells, and/or batteries. In accordance with at least certain embodiments, the present disclosure or invention is directed to novel or improved battery separators for lead acid batteries. In addition, disclosed herein are methods, systems and battery separators for enhancing battery life, reducing water loss, reducing float current, minimizing internal resistance increase, reducing failure rate, reducing acid stratification and/or improving uniformity in at least lead acid batteries. In accordance with at least particular embodiments, the present disclosure or invention is directed to an improved separator for lead acid batteries wherein the separator includes improved coatings, improved configurations, and/or the like.