Cell Balancing Circuit Error Diagnosis via Time Deviation
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Solution Overview
Problem
Current methods struggle to effectively control cell balancing in battery management systems, leading to intensified voltage deviations between cells in battery packs, especially when charging and discharging, which can result in abnormal operations and potential hardware issues.
Innovation Solution
A method for diagnosing errors in cell balancing by calculating the time deviation between the cell balancing residual time and the required time in previous and current driving cycles, determining if an error has occurred based on predetermined ranges, and re-controlling the cell balancing to prevent abnormal operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cell balancing control is implemented in battery management systems, then voltage deviation between cells can be reduced, but the complexity of the control system increases and requires additional monitoring mechanisms
Solution Approach 1:
The patent implements a feedback mechanism by continuously monitoring cell voltages during charging and discharging operations, calculating voltage deviations, and automatically adjusting the cell balancing control based on the monitored data. This closed-loop feedback system maintains voltage balance without requiring complex manual intervention or additional hardware beyond standard battery management components.
2Reliability
If cell balancing is controlled during charging and discharging, then voltage deviation can be prevented, but the control logic and monitoring requirements increase system complexity
Solution Approach 1:
The patent applies preliminary action by predicting voltage deviations based on historical data and operational patterns before they actually occur. The system calculates expected voltage changes during charging and discharging cycles and pre-adjusts cell balancing parameters to prevent voltage deviation, rather than reacting after the deviation occurs. This proactive approach simplifies the control logic compared to complex real-time correction systems.
3Reliability
If voltage deviation between cells is monitored and controlled, then battery performance can be maintained, but the monitoring system becomes more complex and requires additional measurements
Solution Approach 1:
The patent makes the existing battery management system components multi-functional by using the same voltage sensing circuits and control processors to perform both standard battery management functions and cell balancing monitoring. The existing microcontroller unit is programmed to calculate voltage deviations and control balancing operations, eliminating the need for separate dedicated monitoring hardware and reducing overall system complexity.
Data Source
AI summary
A method for diagnosing an error of cell balancing in a cell balancing circuit constantly maintaining a plurality of cell voltages of a battery includes a first step of calculating a cell balancing residual time through a cell balancing required time and a cell balancing performing time in a previous driving, a second step of confirming a cell balancing required time in a current driving after the first step, a third step of calculating a time deviation between the cell balancing required time of the second step and the cell balancing residual time of the first step, and a fourth step of deciding whether or not the error has occurred through the time deviation calculated in the third step.