Secondary Battery Internal Resistance Detection at Target SOC
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The accuracy of secondary battery analysis decreases as the service time increases, as direct current internal resistance changes over time, and offline testing methods fail to provide real-time and accurate measurements.
Innovation Solution
A method and apparatus for detecting the internal resistance of secondary batteries online by charging the battery to a target state of charge (SOC) value, stopping the charge, and maintaining it for a duration, then calculating the internal resistance using data collected during the charge and stop periods, allowing for real-time monitoring and improved accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If offline testing is used to obtain direct current internal resistance, then the testing process is simple, but the accuracy of battery analysis decreases as service time increases
Solution Approach 1:
The patent transitions from static offline testing to dynamic online monitoring. The battery management system continuously monitors battery parameters during charging and discharging processes, dynamically calculating internal resistance based on real-time voltage and current data. This dynamic approach ensures accuracy throughout the battery's service life without requiring repeated offline testing.
Solution Approach 2:
The system implements feedback mechanisms by continuously measuring terminal voltage and current during charging/discharging, then using this feedback to calculate and update internal resistance values. The calculated internal resistance feeds back into the battery management system to adjust charging parameters and monitor battery health, creating a closed-loop control system that maintains high accuracy.
2Loss of time
If offline testing is used before battery use, then initial resistance values are obtained, but real-time changes during service cannot be detected
Solution Approach 1:
The patent implements continuous monitoring of battery parameters during normal operation. The battery management system continuously acquires voltage and current data during charging and discharging, enabling uninterrupted monitoring of internal resistance changes throughout the battery's service life without stopping operation for repeated testing.
Solution Approach 2:
The battery management system performs self-diagnosis by using its own operational data (voltage and current during charging/discharging) to calculate internal resistance. The system serves itself by monitoring its own health status without requiring external testing equipment, enabling continuous self-assessment during normal operation.
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 precise and continuous monitoring of direct current internal resistance, improving the accuracy of battery analysis and state of charge determination, thereby enhancing the management and performance of secondary batteries.
Implementation Method 1
determining the internal resistance of the secondary battery includes: determining a direct current internal resistance of the secondary battery based on a charge current and terminal voltages of the secondary battery
Data Source
AI summary
A method for detecting an internal resistance of a secondary battery, and an electronic device. The method for detecting an internal resistance of a secondary battery includes: charging a secondary battery with a charge current, and in response to a real-time state of charge (SOC) of the secondary battery reaching a target SOC value, stopping charging the secondary battery and keeping for a first duration t; and obtaining data related to the secondary battery during a charge period and a charge stopping period of the secondary battery, and determining the internal resistance of the secondary battery on the basis of the data related to the secondary battery, where the target SOC value includes a plurality of values.