Lead-Acid Battery Separator Coating for PSoC Charge Acceptance
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Solution Overview
Problem
Existing lead-acid battery separators fail to maintain excellent charge acceptance performance and water loss characteristics, especially under partial state of charge (PSoC) conditions, and are prone to increased internal resistance and layer peeling.
Innovation Solution
A separator for lead-acid batteries featuring a conductive layer with a continuous phase of conductive material and a dispersed phase of low-potential metal materials, such as zinc or zinc compounds, to reduce sulfation and water decomposition, while maintaining suitable electrical resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conductive layer is provided on the separator surface to promote electrode surface reaction, then charge acceptance is improved, but electrical resistance of the separator increases and initial discharge capacity decreases
Solution Approach 1:
The conductive layer is applied locally only on the separator surface in contact with electrodes, rather than throughout the entire separator. This localized application promotes electrode surface reactions and charge acceptance while minimizing the overall electrical resistance increase, as the bulk separator material retains its original low-resistance properties.
Solution Approach 2:
The separator is constructed as a composite structure combining the base separator material with a conductive layer containing carbon materials and metal powders. This composite structure provides dual functionality: the conductive layer enhances charge acceptance through improved electron transfer, while the base separator maintains low electrical resistance for efficient ion transport.
2Ease of manufacture
If conventional separator structures are used, then manufacturing is simple, but water loss characteristics deteriorate under PSoC conditions
Solution Approach 1:
The separator structure actively suppresses water decomposition reactions through its conductive layer, which modifies the electrode surface reactions. This self-service function reduces water loss under PSoC conditions without requiring external intervention or complex additional components, maintaining ease of manufacture while improving water loss characteristics.
3Ease of manufacture
If simple separator structures are used, then manufacturing cost is low, but layer peeling occurs during battery operation
Solution Approach 1:
The conductive layer is pre-applied to the separator surface during manufacturing, creating a stable bonding interface before battery assembly. This preliminary action ensures proper adhesion between the separator and electrode, preventing layer peeling during subsequent battery operation while maintaining a relatively simple manufacturing process.
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 enhances charge acceptance, water loss characteristics, and reduces layer peeling, achieving improved performance and longevity of lead-acid batteries under PSoC conditions with suitable electrical resistance.
Implementation Method 1
control an electrode surface reaction, which occurs on the contact surface between the separator and the electrode... By improving the structure of the separator and controlling an electrode surface reaction... the accumulation of the formed sulfate crystals dramatically reduces the charge acceptance performance
Implementation Method 2
When the negative electrode reaches the hydrogen generation potential, water is decomposed and water loss occurs... improve and maintain the water loss characteristics
Implementation Method 3
the conductive layer has a continuous phase formed of a conductive material... suitable ER (electrical resistance)
Data Source
AI summary
The present invention provides: a separator for lead acid storage batteries, the separator exhibiting excellent charge acceptance performance and excellent liquid loss characteristics when in use under PSoC, while being not susceptible to the occurrence of ply separation within a lead acid storage battery and having good ER; and a lead acid storage battery which uses this separator for lead acid storage batteries. The present invention provides a separator for lead acid storage batteries, the separator comprising a base material and a conductive layer that is superposed on at least one surface of the base material.