Absorptive Mat Separator for Flooded Battery Acid Stratification
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Solution Overview
Problem
Enhanced flooded lead acid batteries experience reduced lifespan due to acid stratification, which occurs when the electrolyte concentrates at the bottom of the cell, leading to positive grid corrosion and inactive lead sulfate formation on the negative plate, especially in partial state of charge conditions and undercharging scenarios.
Innovation Solution
A battery separator comprising a microporous membrane and an absorptive mat with a high wicking height and ability to swell when wetted, made from microfibers with diameters less than 1 micrometer, is designed to minimize acid stratification by effectively distributing the electrolyte and preventing concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a conventional flooded battery separator is used, then the battery structure is simple and manufacturing is easy, but acid stratification occurs leading to reduced battery lifespan
Solution Approach 1:
The separator is constructed as a composite material system combining a base separator layer with an absorptive mat layer containing hydrophilic materials and surfactants. This composite structure prevents acid stratification while maintaining manufacturing feasibility, resolving the contradiction between extended battery lifespan and structural complexity.
Solution Approach 2:
The absorptive mat incorporates porous hydrophilic materials with specific pore structures that facilitate electrolyte distribution and prevent stratification. The porous structure enables the separator to actively combat acid concentration issues without requiring complex mechanical systems, thus extending battery life while keeping the design relatively simple.
2Reliability
If the separator uses advanced absorptive materials with high wicking height, then acid stratification is reduced, but manufacturing complexity and cost increase
Solution Approach 1:
The invention modifies the chemical parameters of the separator by incorporating surfactants and hydrophilic materials with specific surface properties. These parameter changes enhance wicking height and acid stratification resistance while using materials and processes that remain compatible with existing manufacturing capabilities, balancing reliability improvement with manufacturing ease.
3Productivity
If the separator is designed to actively distribute electrolyte, then charge acceptance improves, but the separator structure becomes more complex
Solution Approach 1:
The separator utilizes self-service mechanisms where the absorptive mat automatically distributes electrolyte through capillary action and wicking driven by the hydrophilic materials and surfactants. This passive self-distribution system improves charge acceptance without requiring external power sources or complex active control mechanisms, thus enhancing productivity while limiting structural complexity.
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 absorptive mat in the battery separator significantly reduces acid stratification, enhancing the lifespan of enhanced flooded batteries by maintaining even electrolyte distribution and preventing corrosion, thus improving the battery's cyclic durability and charge acceptance.
Implementation Method 1
an absorptive mat with a high wicking height and ability to swell when wetted
Implementation Method 2
The separator permits exchange of ions with least possible resistance, while preventing a short that will result from the positive and negative electrode touching each other
Data Source
AI summary
A battery separator configured for reducing acid stratification for an enhanced flooded battery. The battery separator for the enhanced flooded battery is configured to minimize acid stratification. The battery separator is comprised of a microporous membrane and an absorptive mat. The absorptive mat includes a 3-hour wicking height greater than 15 cm. Wherein the absorptive mat of the battery separator is configured to minimize acid stratification of the enhanced flooded battery.