Battery Impedance Measurement Using Capacitor Voltage Pre-Charge
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Solution Overview
Problem
Conventional electrochemical impedance spectroscopy for lithium-ion batteries lacks accuracy in measuring impedance due to the lack of monitoring pre-charging capacitor voltages, leading to inaccurate impedance measurements.
Innovation Solution
A battery management apparatus that includes capacitors connected to batteries, with a controller to pre-charge these capacitors and measure their voltage, controlling impedance measurements based on threshold ranges to ensure accurate voltage levels before conducting impedance measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional electrochemical impedance spectroscopy is used to measure battery impedance based on elapsed time without monitoring pre-charging capacitor voltage, then the measurement process is simple, but the impedance measurement accuracy deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-charging the capacitor before impedance measurement and monitoring its voltage to ensure it is within a threshold range. This preliminary voltage verification ensures that the capacitor is properly charged to facilitate accurate impedance measurement, thereby improving measurement precision without significantly increasing overall system complexity.
Solution Approach 2:
The patent implements feedback by continuously monitoring the capacitor voltage during the pre-charging process and using this information to determine when the capacitor is ready for impedance measurement. The controller adjusts the measurement timing based on the monitored voltage, creating a closed-loop system that improves measurement accuracy while maintaining operational simplicity.
2Measurement precision
If pre-charging capacitor voltage is monitored before impedance measurement, then impedance measurement accuracy is improved, but the measurement process complexity increases
Solution Approach 1:
The patent performs preliminary voltage monitoring of the pre-charging capacitor before initiating impedance measurement. By verifying the capacitor voltage is within the threshold range beforehand, the system ensures accurate measurement conditions are met, improving impedance measurement precision while the monitoring process itself is integrated efficiently to minimize time loss.
Solution Approach 2:
The system uses feedback from voltage monitoring to dynamically adjust the measurement process. When the capacitor voltage reaches the threshold range, the system automatically proceeds with impedance measurement, eliminating unnecessary waiting time and optimizing the overall measurement duration while maintaining high accuracy.
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
Improves the accuracy of impedance measurements in lithium-ion batteries by monitoring capacitor voltages, thereby stabilizing battery management and extending battery lifespan.
Implementation Method 1
one or more capacitors, each capacitor of the one or more capacitors connected to a respective battery among one or more batteries
Implementation Method 2
measure a respective voltage of each of the one or more capacitors
Implementation Method 3
a sensor configured to measure impedance of the battery
Data Source
AI summary
A battery management apparatus includes at least one capacitor respectively connected to at least one battery and a controller configured to apply current to the at least one capacitors to pre-charge the at least one capacitors, measure a voltage of each of the at least one capacitors, and control impedance measurement of the at least one batteries based on whether the voltage of the at least one capacitors is within a threshold range.