AGM Lead-Acid Paste and Electrolyte Composition for Longer Cycle Life
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Solution Overview
Problem
There is a need for an electrochemical cell that provides improved performance in a flat plate AGM lead acid battery.
Innovation Solution
The electrochemical cell includes a flat positive plate composed of a grid made of virgin lead or high purity lead, with a positive battery paste containing a lead-containing composition, a positive plate paste vehicle, and a polyvinylsulfonate additive. A flat negative plate with a similar grid structure and negative battery paste is also used, along with an absorbent glass mat and an electrolyte that includes phosphoric acid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional lead acid battery paste compositions are used, then the battery structure is simple and easy to manufacture, but the charge capacity and cycle life are limited
Solution Approach 1:
The patent applies composite materials by combining conventional lead-containing compositions with polyvinylsulfonate additives and phosphoric acid in the electrolyte. This creates a multi-component paste system that improves cycle life and charge capacity while maintaining manufacturability through established battery manufacturing processes.
Solution Approach 2:
The patent modifies the chemical composition parameters of the battery paste by introducing polyvinylsulfonate compounds at specific concentrations (0.1-5% by weight) and adjusting electrolyte composition with phosphoric acid (0.1-5% by weight). These parameter changes enhance performance without fundamentally altering the battery structure.
2Manufacturing precision
If conventional battery paste compositions are used, then the manufacturing process is simple, but extraneous crystal growth occurs and performance consistency varies
Solution Approach 1:
The polyvinylsulfonate compound acts as an intermediary additive in the paste composition that controls crystal growth of lead sulfate during charge-discharge cycles. This mediator prevents extraneous crystal formation and ensures consistent performance across manufacturing batches while using standard manufacturing equipment.
Solution Approach 2:
The patent adjusts the chemical composition parameters by adding polyvinylsulfonate at controlled concentrations (0.1-5% by weight) to modify paste properties. This parameter change suppresses unwanted crystal growth and improves performance consistency without complicating the manufacturing process.
3Reliability
If phosphoric acid is added to the electrolyte, then charge capacity and cycle life are improved, but the electrolyte composition becomes more complex
Solution Approach 1:
The patent modifies the electrolyte composition parameter by adding phosphoric acid at specific concentrations (0.1-5% by weight) to the sulfuric acid electrolyte. This parameter change enhances charge capacity and cycle life while maintaining electrolyte preparation simplicity through direct mixing of components.
Solution Approach 2:
The electrolyte is formulated as a composite system combining sulfuric acid with phosphoric acid additives. This composite electrolyte composition improves battery performance through synergistic effects while using established electrolyte preparation methods.
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
This configuration enhances the performance of the flat plate AGM lead acid battery by improving charge capacity, cycle life, and overall efficiency, while also controlling extraneous crystal growth and maintaining consistency under various operating conditions.
Implementation Method 1
An absorbent glass mat is interleaved between the flat positive plate and the flat negative plate and an electrolyte is provided in the container and retained in the absorbent glass mat
Implementation Method 2
The electrochemical cell includes a flat positive plate composed of a grid formed of virgin lead or high purity lead or highly purified secondary lead and a positive battery paste disposed on the grid. The battery paste comprises a lead-containing composition, a positive plate paste vehicle, and a polyvinylsulfonate additive
Data Source
Figure 1
Figure 2~3
AI summary
A lead acid battery is provided. The battery includes a container and a plurality of electrochemical cells within the container. The electrochemical cells have a plurality of flat positive plates each composed of a grid formed of virgin lead or high purity lead or highly purified secondary lead and a positive battery paste disposed on the grid, the battery paste comprising a lead-containing composition, a positive plate paste vehicle, and a polyvinylsulfonate additive. The electrochemical cells also have a plurality of flat negative plates each composed of a grid and a negative battery paste disposed on the grid, the battery paste comprising a lead-containing composition and a negative plate paste vehicle. An absorbent glass mat is interleaved between the flat positive plate and the flat negative plate. An electrolyte is provided in the container and retained in the absorbent glass mat. The electrolyte includes phosphoric acid. The plurality of flat positive plates and the plurality of flat negative plates are connected by intercell connectors and coupled to one or more terminals. A lid is provided on the container.