Lead-Acid Battery Separator Rib and Carbon Mix for PSOC Life
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Lead-acid batteries used in partial state of charge (PSOC) conditions face challenges in maintaining life performance and low-temperature high rate performance due to sulfation and electrolyte solution stratification.
Innovation Solution
Incorporating first carbon particles with specific size ranges into the negative electrode material and providing a rib on the separator to improve electrolyte solution diffusivity, thereby preventing pore blockage and enhancing PSOC life performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If carbon is added to the negative electrode material to prevent sulfation, then PSOC life performance is improved, but low-temperature high rate performance decreases due to separator pore blockage
Solution Approach 1:
The patent changes the particle size parameter of carbon particles from conventional sizes to specifically less than 32 μm. This parameter change allows carbon particles to effectively prevent sulfation while minimizing their tendency to block separator pores, thus improving PSOC life performance without significantly degrading low-temperature high rate performance
Solution Approach 2:
The patent applies local quality by controlling the distribution and size of carbon particles within the negative electrode material. By using smaller carbon particles (<32 μm) specifically in the negative electrode material, the patent creates a localized improvement in sulfation prevention while minimizing the harmful effects on separator porosity and ion transport
2Reliability
If carbon particles are added to improve PSOC life performance, then sulfation is prevented, but separator pores may be blocked by carbon particles smaller than pore size
Solution Approach 1:
The patent changes the particle size parameter of carbon particles to less than 32 μm, which is carefully selected to balance two competing requirements: being small enough to effectively prevent sulfation on the negative electrode, while being large enough to minimize blockage of separator pores. This precise parameter control resolves the contradiction between sulfation prevention and pore blockage
Solution Approach 2:
The patent uses carbon particles that replicate the beneficial properties of larger carbon structures (sulfation prevention) while having the advantageous properties of smaller particles (reduced pore blockage). The smaller carbon particles <32 μm serve as an optimized copy that maintains the essential function of sulfation prevention while eliminating the harmful effect of pore blockage
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 effectively improves PSOC life performance and maintains low-temperature high rate performance by preventing electrolyte solution stratification and pore blockage, while also enhancing charge efficiency and preventing permeation short circuits.
Implementation Method 1
When carbon is added to the negative electrode material, sulfation is prevented, thereby improving the PSOC life performance to some extent
Implementation Method 2
the separator includes a rib on at least the negative electrode plate side... the first carbon particles include second carbon particles having a particle size smaller than an average pore size of the separator
Implementation Method 3
the carbon that has flowed into the electrolyte solution may block the pores of the separator to lower the low-temperature high rate performance
Data Source
Figure 1
AI summary
A lead-acid battery includes a positive electrode plate, a negative electrode plate, a separator interposed between the positive electrode plate and the negative electrode plate, and an electrolyte solution. The separator includes a rib on at least the negative electrode plate side. The negative electrode plate includes a negative electrode material, and the negative electrode material contains carbon particles. The carbon particles include first carbon particles having a particle size of less than 32 µm, and the first carbon particles include second carbon particles having a particle size smaller than an average pore size of the separator. A content of the first carbon particles in the negative electrode material is 0.2% by mass or more and 2% by mass or less.