AGM Battery Negative Active Material for Charge Acceptance
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Solution Overview
Problem
Existing lead-acid batteries, particularly AGM batteries, face challenges in providing consistent and reliable performance, especially in supporting additional loads and maintaining optimal performance during stop events in start-stop vehicles.
Innovation Solution
The development of a lead-acid storage battery with improved performance, featuring positive and negative plates with specific grid structures, electrochemically active materials including barium sulfate and expanders, and an absorbent glass mat separator, along with an optimized sulfuric acid electrolyte solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional AGM battery structure is used, then basic starting function is provided, but charge acceptance and cycling performance are insufficient
Solution Approach 1:
The patent modifies the chemical composition parameters of the negative electrochemically active material by incorporating barium sulfate and specific expanders, changing the material properties to improve both charge acceptance and cycling performance simultaneously
Solution Approach 2:
The patent uses composite negative active material comprising barium sulfate, expander, and lead compounds, creating a multi-component material system that achieves superior charge acceptance (up to 5 times better) and extended cycling life compared to traditional single-material compositions
2Quantity of substance
If battery supports additional prolonged loads for vehicle electronics, then electrical load capacity increases, but battery reliability during stop events deteriorates
Solution Approach 1:
The patent applies different material compositions to different electrodes, with the negative electrode receiving special treatment through barium sulfate and expander addition, creating localized optimization that enables high load capacity while maintaining overall battery reliability
3Speed
If fast rechargeability is optimized, then charge acceptance improves, but manufacturing complexity increases
Solution Approach 1:
The patent changes the chemical parameters of the negative active material (adding barium sulfate and expander) to inherently improve charge acceptance speed, achieving fast rechargeability through material composition rather than complex structural modifications
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 charge acceptance, cycling performance, and rechargeability, providing up to 5 times better dynamic charge acceptance compared to existing AGM batteries, while maintaining cold cranking capacity and extended service life.
Implementation Method 1
an absorbent glass mat separator between the positive plate and the negative plate
Implementation Method 2
The lead, lead dioxide and electrolyte provide a chemical means of storing electrical energy which can perform useful work when the terminals of a battery are connected to an external circuit
Implementation Method 3
the negative electrochemically active material comprises, in part, barium sulfate and an expander
Data Source
AI summary
A lead-acid battery is disclosed. The lead-acid storage battery has a container with a cover, the container including one or more compartments. One or more cell elements are provided in the one or more compartments. The one or more cell elements include a positive plate, the positive plate having a positive grid and a positive electrochemically active material on the positive grid; a negative plate, the negative plate having a negative grid and a negative electrochemically active material on the negative grid, wherein the negative electrochemically active material comprises barium sulfate and an organic expander; and a separator between the positive plate and the negative plate. Electrolyte is provided within the container. One or more terminal posts extend from the cover and are electrically coupled to the one or more cell elements.