Battery Charging Waveform Tuning for Harmonic Impedance Control
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Solution Overview
Problem
Conventional battery charging methods, particularly rapid charging, often result in inefficiencies and degradation due to high-frequency harmonics, leading to increased impedance, heat generation, and reduced battery life.
Innovation Solution
A method and system for harmonically tuning the charge signal by identifying and altering harmonic components based on impedance profiles to optimize energy transfer, using a processor to transform and inverse transform waveforms, and applying a harmonically tuned waveform to the battery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If rapid charging is used, then charging speed is improved, but charging efficiency deteriorates due to high-frequency harmonics causing increased impedance and heat generation
Solution Approach 1:
The patent transforms the charge signal from a conventional square wave to a sine wave with specifically tuned harmonic components. By changing the waveform parameters and selectively adjusting harmonic frequencies, the system achieves both rapid charging and high efficiency by matching the battery's impedance characteristics at different frequencies.
Solution Approach 2:
The system dynamically adjusts the harmonic content of the charge signal based on real-time battery impedance measurements. The controller continuously modifies the waveform to optimize energy transfer efficiency while maintaining fast charging rates, adapting to changing battery conditions during the charging process.
2Device complexity
If conventional square wave charging is used, then charging simplicity is maintained, but battery life deteriorates due to high-frequency harmonics causing impedance increase and heat generation
Solution Approach 1:
The patent modifies the charge signal waveform parameters, specifically transitioning from a square wave to a sine wave with controlled harmonics. This parameter change reduces high-frequency harmonic content that causes impedance increase and heat generation, thereby extending battery life while maintaining reasonable system complexity through software-based waveform generation.
3Speed
If high charging current is applied, then charging speed is improved, but heat generation increases causing battery damage
Solution Approach 1:
The system changes the current waveform from a square wave with high-frequency harmonics to a sine wave with tuned harmonics. This parameter change allows high charging current to be delivered while minimizing resistive heating by matching the battery's frequency-dependent impedance characteristics, thereby achieving fast charging with reduced temperature rise.
Data Source
AI summary
Aspects of the present disclosure involve charging or discharging an electrochemical device such as a battery. The system generates a waveform, such as a charge signal, to tune harmonic attributes of the waveform based on the impedance of the battery to a harmonic or harmonics of the waveform. The system may enhance (e.g., add or increase magnitude) or suppress (e.g., delete or reduce magnitude) harmonics of the waveform. Such a harmonically tuned waveform may optimize energy transfer to or from the battery to achieve various possible goals including charging speed, enhancing battery charge capacity and/or enhancing battery cycle life.