BBU Remaining Capacity Monitoring with Adaptive Moving Windows
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Solution Overview
Problem
Current methods for monitoring Battery Backup Units (BBUs) are inaccurate due to conditions required for voltage measurement, initial cell voltage estimation, charge and discharge voltage differences, and the inability of standard voltameter chips to customize State of Charge (SOC) curves for each battery type, leading to unreliable detection of remaining power and capacity.
Innovation Solution
A method and apparatus that monitor voltage and ampere-hour of BBUs, determining a current moving window point using a remaining power percentage curve, calculating remaining capacity based on this window, and adjusting the variation threshold value according to service time, without additional hardware or data acquisition conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the voltameter chip updates the FCC value based on charge and discharge voltage thresholds, then the metering function is implemented, but the FCC value becomes inaccurate due to practical voltage variations
Solution Approach 1:
The patent implements a feedback mechanism where the actual charge and discharge voltages are continuously monitored and used to dynamically adjust the voltage thresholds. The system compares actual voltage values with threshold values and updates the thresholds based on the difference, ensuring that the FCC value calculation remains accurate despite variations in practical battery behavior.
Solution Approach 2:
The patent changes the voltage thresholds dynamically based on actual battery performance. Instead of using fixed voltage thresholds (12.6V charge, 7.5V discharge), the system adjusts these parameters according to actual charge and discharge curves, allowing the metering chip to adapt to different battery states and maintain accurate FCC value measurement.
2Ease of operation
If the voltameter chip estimates FCC based on open-circuit voltage and SOC curves, then the metering function is provided, but the FCC value is inaccurate due to battery chemical characteristics variation
Solution Approach 1:
The patent performs preliminary calibration by fully charging and discharging the battery before normal operation to establish accurate voltage thresholds. This preliminary action ensures that the voltage-SOC relationship is properly characterized before the metering function begins, improving the accuracy of subsequent FCC value estimates without requiring complex real-time adjustments.
Solution Approach 2:
The system uses the battery's own charge and discharge processes to automatically calibrate and update the voltage thresholds. Instead of requiring external intervention or manual calibration, the metering chip learns from the battery's actual behavior during normal operation, making the system self-adjusting and adaptable to individual battery characteristics.
3Measurement precision
If additional hardware is added to improve BBU monitoring accuracy, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent makes the existing voltameter chip self-sufficient by enabling it to automatically update its own voltage thresholds based on actual battery behavior. The chip uses its existing resources (ADC, memory, processing capability) to perform calibration and threshold adjustment without requiring additional sensors, microcontrollers, or calibration hardware, thus improving accuracy while maintaining simplicity.
Solution Approach 2:
The patent makes the voltameter chip multi-functional by combining its original metering function with the additional capability of adaptive threshold calibration. The same chip that measures voltage and calculates FCC value also performs self-calibration and threshold adjustment, eliminating the need for separate calibration hardware and reducing overall system complexity.
Data Source
AI summary
A method and an apparatus for monitoring a Battery Backup Unit (BBU) (312), a server (301), and a readable storage medium (330) are provided. The method includes following steps: monitoring a voltage and a ampere-hour of the BBU (312) (S101); when the voltage is static and the variation of the ampere-hour is greater than a variation threshold value, determining a current moving window point by a remaining power percentage curve corresponding to the BBU (312) (S102); determining a current moving window by a previous moving window point and the current moving window point (S103); and calculating a remaining capacity of the BBU (312) by the current moving window (S104).