Porous Lead-Acid Electrode Plate for Sulfate Crystal Suppression
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Solution Overview
Problem
Conventional lead-acid battery manufacturing faces issues with lead sulfate crystallization and dendrite growth due to insufficient air permeability and concentration gradients in larger electrode plates, leading to short circuits and reduced battery lifespan.
Innovation Solution
A lead-acid battery electrode plate with a porous structure comprising non-metallic sheet materials on both sides of an electricity collector layer, enhancing air permeability and incorporating electrical conductive and corrosion-resistant materials to prevent lead sulfate crystallization and dendrite growth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional lead paste paper is used to cover the electrode plate surface, then the electrode plate is protected from sticking to other components, but air permeability is insufficient causing gas and heat accumulation
Solution Approach 1:
The patent uses porous silica gel material as the lead paste paper substitute. This porous structure provides sufficient air permeability to allow gas and heat to dissipate rapidly during chemical reactions, while still maintaining the protective function of preventing the electrode plate from sticking to other battery components.
Solution Approach 2:
The patent employs a composite structure combining silica gel particles with a fibrous matrix to create the lead paste paper. This composite material achieves both the protective function (preventing sticking) and the air permeability function (allowing gas and heat dissipation) simultaneously.
2Quantity of substance
If larger-sized electrode plates are used for high capacity batteries, then battery capacity increases, but concentration equilibrium cannot be reached in central area leading to pure hydration
Solution Approach 1:
The porous silica gel material in the lead paste paper enhances convective diffusion by providing channels for electrolyte solution circulation. This improves the ability of the electrolyte to reach the central area of large electrode plates, maintaining concentration equilibrium and preventing pure hydration even in high-capacity batteries with large electrode dimensions.
3Use of energy by moving object
If aqueous sulfuric acid solution immerses the electrode plate stack, then electrochemical reactions occur, but lead sulfate crystallizes and grows dendrites causing short circuit
Solution Approach 1:
The porous silica gel material prevents lead sulfate crystallization by providing a three-dimensional network structure that physically restricts crystal growth. The porous structure allows electrolyte penetration for electrochemical reactions while the silica gel particles interfere with the formation and growth of lead sulfate crystals and dendrites, preventing short circuits.
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 solution improves air permeability, reduces surface vulcanization, and extends battery lifespan by efficiently ventilating gases and maintaining electrolyte concentration, thereby preventing short circuits and enhancing formation efficiency.
Implementation Method 1
the non-metallic sheet material has a porous structure to be air-permeable channels
Implementation Method 2
the aqueous sulfuric acid solution in central area of the electrode plate to reach an equilibrium in terms of concentration with the aqueous sulfuric acid solution in the surrounding area through convective diffusion
Implementation Method 3
lead sulfate to dissolve into the aqueous sulfuric acid
Data Source
AI summary
The present invention discloses a lead-acid battery electrode plate for preventing lead-acid battery from lead (II) sulfate crystal growth piercing and enhancing the battery formation efficiency. The lead-acid battery electrode plate comprises an electricity collector layer as an electric current channel, and two air permeable layers respectively placed on both sides of the electricity collector layer, wherein non-metallic sheet materials having porous structures are used as air-permeable channel of the air-permeable layers, and the first air-permeable layer is the same as or different from the second air-permeable layer.