Rechargeable Battery Curve Alignment for Dynamic Resistance Detection
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Solution Overview
Problem
Conventional methods for analyzing the resistance characteristics of rechargeable batteries are inadequate for real-time monitoring during operation, as they primarily measure resistance when the battery is stable post-rest, failing to capture dynamic resistance during use.
Innovation Solution
A battery characteristic detection device and method that includes a control device to perform continuous charging/discharging cycles at varying rates, measuring voltage and current, and generating charging/discharging curved lines to analyze resistance characteristics by aligning capacity variations and voltages, using a bend-over method to determine reference capacities and overvoltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional resistance measurement methods are used (measuring after rest), then the measurement is simple and stable, but it fails to capture dynamic resistance characteristics during battery operation
Solution Approach 1:
The patent transitions from static resistance measurement (after rest) to dynamic resistance measurement during charging/discharging cycles. The control device continuously monitors voltage and current while the battery is operating, capturing resistance characteristics under varying load conditions. This dynamic approach allows resistance analysis during actual battery usage rather than requiring the battery to be at rest.
Solution Approach 2:
The patent implements continuous charging/discharging cycles with ongoing voltage and current measurements. Instead of intermittent measurements after rest periods, the system maintains continuous operation and continuously collects data, ensuring that resistance characteristics are captured throughout the entire operational range without interruption or idle periods.
2Loss of information
If continuous charging/discharging cycles are performed for dynamic resistance analysis, then resistance characteristics during operation can be captured, but the measurement and analysis complexity increases
Solution Approach 1:
The control device performs multiple functions simultaneously: it manages charging/discharging cycles, measures voltage and current, calculates capacity variations, and analyzes resistance characteristics. This multi-functional approach consolidates what would otherwise require separate systems into a single control device, managing complexity through integration rather than multiplication of components.
Solution Approach 2:
The system uses its own operational data (voltage and current measurements during charging/discharging) to calculate resistance characteristics. The charging/discharging process itself generates the data needed for resistance analysis, eliminating the need for separate measurement systems. The battery's own operation serves as both the test subject and the measurement source.
3Measurement precision
If reference capacity alignment is performed for curved line generation, then resistance analysis accuracy is improved, but the processing complexity increases
Solution Approach 1:
The control device performs preliminary alignment of capacity variations before generating charging/discharging curved lines. By pre-processing the capacity data to ensure proper alignment between charging and discharging cycles, the system establishes a accurate baseline for resistance calculation. This preliminary action prevents errors that would require more complex correction algorithms later.
Solution Approach 2:
The patent replaces physical alignment methods with computational approaches. Instead of mechanical or manual alignment of capacity measurements, the control device uses algorithms to automatically align charging and discharging curved lines based on capacity variation data. This substitution of computational methods for physical alignment reduces manual intervention while maintaining precision.
Data Source
AI summary
The present disclosure relates to a battery characteristic detection device and method of a rechargeable battery. The battery characteristic detection device may include a control device configured to detect voltages and capacity variations of the rechargeable battery during a plurality of continuous charging/discharging cycles, and generate a charging/discharging curved line representing a relationship between the voltage and the capacity variation for each of the plurality of charging/discharging cycles. Each charging/discharging cycle may include a charging section and a discharging section. The control device may be further configured to select one of the charging section and the discharging section of a first charging/discharging cycle among the plurality of charging/discharging cycles as a reference section, determine a capacity of the rechargeable battery at a start or end time point of the reference section as a reference capacity, and obtain the capacity variation based on the reference capacity.