Lead Acid Battery Electrode With Variable Resistance Pasting
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Solution Overview
Problem
Lead acid batteries suffer from acid stratification and sulfation due to uneven current density between electrodes, leading to reduced performance and premature failure.
Innovation Solution
A lead acid battery electrode with a pasting material distributed to provide uniform current density across the electrodes, which can be achieved by applying a pasting material with varying resistance and thickness to ensure consistent current flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional uniform pasting material is applied to electrodes, then manufacturing is simple, but current density becomes uneven causing acid stratification and sulfation
Solution Approach 1:
The pasting material is applied with locally varying properties - specifically, the resistance and/or thickness varies in the vertical direction (from top to bottom of the electrode). This local variation compensates for the natural tendency of current to concentrate at the top, creating more uniform current density distribution across the entire electrode height, thereby preventing acid stratification and sulfation.
Solution Approach 2:
The invention changes the physical parameters of the pasting material - specifically varying the resistance and/or thickness parameters in a controlled manner from the top to bottom of the electrode. This parameter gradient allows the pasting material to function as a current redistributor, modifying the electrical characteristics of different electrode regions to achieve uniform current density.
2Adaptability or versatility
If electrodes are kept at low charge for extended periods, then vehicle operation is flexible, but acid stratification occurs reducing battery performance
Solution Approach 1:
The uniform current density distribution is established in advance through the specially designed pasting material before any charging or discharging occurs. This preliminary structural arrangement ensures that even during extended periods at low charge or partial state of charge, the current flows uniformly across the electrode, preventing the development of acid stratification and maintaining battery readiness for flexible operation.
3Quantity of substance
If current density is uneven across electrodes, then manufacturing is straightforward, but sulfation occurs leading to loss of active material
Solution Approach 1:
The pasting material is applied with locally varying properties - specifically, the resistance and/or thickness varies in the vertical direction (from top to bottom of the electrode). This local variation compensates for the natural tendency of current to concentrate at the top, creating more uniform current density distribution across the entire electrode height, thereby preventing acid stratification and sulfation.
Solution Approach 2:
The invention changes the physical parameters of the pasting material - specifically varying the resistance and/or thickness parameters in a controlled manner from the top to bottom of the electrode. This parameter gradient allows the pasting material to function as a current redistributor, modifying the electrical characteristics of different electrode regions to achieve uniform current density.
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 uniform current density distribution reduces acid stratification and sulfation, enhancing battery performance and extending its lifespan by maintaining consistent charging and discharging efficiency.
Implementation Method 1
a pasting material or paper with variable resistance
Data Source
AI summary
An electrode for a lead acid battery is provided. The electrode includes a pasting material distributed on the electrode and arranged to provide uniform current density. A lead acid battery having a plurality of electrodes, each electrode having pasting material providing uniform current density across the electrodes is also provided. A method for manufacturing a battery electrode is also provided and includes applying a portion of the electrode with a pasting material providing uniform current density.