Battery Charger Preventing Lithium Plating via Anode Potential Control
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Solution Overview
Problem
Lithium ion batteries face rapid degradation and reduced lifespan due to lithium plating during high-rate charging, which can lead to battery swelling, rupture, and fire risks, while conventional charging methods fail to balance fast charging with battery longevity.
Innovation Solution
A battery charging system that dynamically adjusts the charging current based on calculated open cell anode voltage and resistance to prevent lithium plating, using a constant anode potential phase followed by a constant voltage phase, optimizing the charging current to maintain anode electrode potential above lithium metal potential.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-rate charging is applied to reduce charging time, then charging speed is improved, but lithium plating occurs causing battery degradation and safety issues
Solution Approach 1:
The charging system dynamically adjusts the charging current based on real-time monitoring of battery voltage, temperature, and charge state. The controller modifies charging parameters during the charging process to maintain optimal charging rate while preventing lithium plating, transitioning from static fixed-rate charging to adaptive dynamic charging control.
Solution Approach 2:
The system changes charging parameters (current, voltage, temperature thresholds) based on battery state. By monitoring battery voltage and temperature and comparing against predetermined thresholds, the controller adjusts charging current to prevent lithium plating while maintaining fast charging capability, adapting parameters rather than using fixed values.
2Reliability
If conservative charging rates are used to extend battery life, then battery lifespan is improved, but charging time increases significantly
Solution Approach 1:
The charging process uses periodic monitoring and adjustment cycles. The controller continuously monitors battery parameters and periodically adjusts charging current based on accumulated data and threshold comparisons, creating a rhythmic pattern of monitoring-adjusting that balances speed and safety.
Solution Approach 2:
The system implements feedback control by monitoring battery voltage, temperature, and charge state, then using this information to adjust charging current. The controller receives feedback from battery sensors and modifies charging parameters accordingly, creating a closed-loop control system that optimizes both charging speed and battery protection.
3Productivity
If rapid charging is applied to meet consumer preferences for fast charging, then charging speed is improved, but harmful effects such as battery swelling and fire risk increase
Solution Approach 1:
The system takes preliminary protective actions by establishing predetermined voltage and temperature thresholds before charging begins. The controller proactively sets safety boundaries and adjusts charging parameters in advance to prevent harmful conditions, rather than reacting after damage occurs.
Solution Approach 2:
The controller acts as an intermediary between the power source and battery, mediating the charging process to prevent harmful effects. It monitors battery state and adjusts charging current to stay within safe boundaries, serving as a protective intermediary that filters out dangerous charging conditions while allowing beneficial charging to proceed.
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 approach enables rapid charging while significantly extending battery life and maintaining capacity over many cycles by avoiding lithium plating, reducing battery degradation, and ensuring safe charging conditions.
Implementation Method 1
In a rechargeable lithium ion battery, energy is stored and retrieved in a chemical reaction via the migration of lithium ions between electrode pairs
Implementation Method 2
During a charge cycle, an electric field created between the cathode and anode forces the lithium ions back to the anode, absorbing energy in the process
Implementation Method 3
Under some circumstances, including high C rate charging, a small portion of lithium ions form metallic lithium and are deposited on the anode during the recharge phase
Data Source
AI summary
A method and apparatus for fast charging a battery with optimal charging. In an arrangement, a system includes a battery charger for applying a voltage to a rechargeable battery; and a controller coupled to the battery charger and monitoring at least one of a battery voltage, a battery temperature, and the current flowing into the battery; wherein the system is configured to apply a charging current from the battery charger by calculating an open cell anode voltage and an anode resistance of the battery, and determining the charging current. In additional arrangements, lithium ion plating is prevented by the charging current. Additional methods and arrangements are disclosed.