Adaptive Charge Current Control for Lithium-Ion Swelling
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Solution Overview
Problem
Lithium-ion batteries experience irreversible swelling during charging, which reduces their useful life and is exacerbated by fast-charging methods, leading to permanent degradation.
Innovation Solution
A method and system that iteratively determine charge profiles and adjust the charge current based on swelling measurements to minimize irreversible swelling, using a physics-based charging cycle model and battery management system to optimize charging processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fast-charging methods are used to increase charging speed, then charging time is reduced, but irreversible swelling increases leading to battery degradation
Solution Approach 1:
The charging system dynamically adjusts the charge current in real-time based on monitored battery swelling. The charge current is reduced when swelling exceeds a threshold and increased when swelling is within acceptable limits, creating a dynamic charging profile that adapts to battery conditions rather than using a fixed fast-charging rate.
Solution Approach 2:
The system implements feedback control by continuously monitoring battery swelling during charging and using this information to adjust the charge current. The swelling measurement feeds back to the control logic, which modifies the charging parameters to prevent excessive swelling while maintaining efficient charging when conditions permit.
2Loss of time
If high charge current is applied to reduce charging time, then charging speed increases, but irreversible swelling is exacerbated
Solution Approach 1:
The system takes preliminary anti-action by reducing the charge current before irreversible swelling can occur. When swelling approaches the threshold, the charge current is proactively reduced to prevent crossing into the harmful regime, rather than waiting for damage to occur and then correcting it.
Solution Approach 2:
The system changes the charging parameter (charge current) based on the battery's swelling state. The charge current is varied between high and low levels depending on whether swelling is below or above the threshold, creating an adaptive charging profile that optimizes the balance between charging speed and swelling control.
Data Source
AI summary
A method and system for charging a battery (e.g., including but not limited to lithium-ion batteries). The method may comprise: iteratively determining a plurality of charge profiles of the battery; based on the plurality of charge profiles, iteratively determining swelling of the battery; and adjusting a charge current during a subsequent charging of the battery.