Battery Current Monitoring with State-Dependent Alarm Thresholds
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Solution Overview
Problem
Conventional battery overcurrent diagnostic methods cannot determine the degree of overcurrent, leading to inconsistent battery management and reduced lifespan due to continuous high currents, as they only compare current limits without considering varying polarization effects.
Innovation Solution
A method and device that monitor charge and discharge currents by acquiring alarm activation and clearance thresholds and calibration times specific to each state, activating alarms based on these thresholds and clearing them when conditions are met, allowing for differentiated management of current levels and reducing battery inconsistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional current limit comparison method is used, then the monitoring method is simple, but the degree of overcurrent cannot be determined and battery management is inconsistent
Solution Approach 1:
The patent applies parameter changes by establishing multiple alarm thresholds (first alarm threshold, second alarm threshold, third alarm threshold) corresponding to different charge and discharge states. These thresholds are set at different percentages (e.g., 105%, 120%, 150% of rated current) to enable precise determination of overcurrent degrees. The system dynamically adjusts which threshold to use based on the current charge/discharge state, thereby achieving accurate overcurrent classification without excessive system complexity.
2Device complexity
If single alarm threshold is used, then the alarm system is simple, but different overcurrent degrees cannot be distinguished and appropriate fault levels cannot be activated
Solution Approach 1:
The patent segments the alarm system into multiple levels by establishing different alarm thresholds (first, second, third thresholds) corresponding to different overcurrent degrees. Each threshold triggers a specific alarm level and fault response. For example, exceeding the first threshold activates a first alarm with first fault level, while exceeding the second threshold activates a second alarm with second fault level. This segmentation enables differentiated battery management strategies for different overcurrent scenarios, improving reliability without excessive complexity.
3Device complexity
If continuous high current monitoring is not implemented, then the monitoring method is simpler, but battery polarization effect and lifespan are adversely affected
Solution Approach 1:
The patent implements continuous monitoring of charge and discharge currents by continuously comparing the current with the appropriate alarm threshold based on the current charge/discharge state. The system continuously determines whether the current exceeds the threshold and continuously manages the alarm state and fault levels. This continuous action ensures that battery polarization effects are detected and addressed promptly, preventing damage accumulation and extending battery lifespan while maintaining reasonable system complexity.
Data Source
AI summary
The present invention provides a method and a device for monitoring charge and discharge currents of a battery. The method for monitoring charge and discharge currents of a battery includes the steps of: acquiring charge and discharge currents and charge and discharge states; acquiring an alarm activation threshold, a continuous calibration time for alarm activation, an alarm clearance threshold; and a continuous calibration time for alarm clearance corresponding to the charge and discharge states; activating an alarm if the charge and discharge currents are greater than or equal to the alarm activation threshold and the time of duration exceeds the continuous calibration time for alarm activation, and clearing the alarm if the charge and discharge currents are less than the alarm clearance threshold and the time of duration exceeds the continuous calibration time for alarm clearance.