Battery Cell Voltage Sampling for Phase Error Compensation
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Solution Overview
Problem
Phase errors in battery cell voltage measurements due to the complex impedance of battery cells in multi-cell batteries lead to inaccuracies in monitoring and extracting information such as temperature data.
Innovation Solution
A method and system that compensates for phase errors by identifying time constants for filter circuits connected to battery cells, determining sampling times based on these constants, and sampling voltages at specific times to align phases and reduce errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If filter circuits are connected to battery cells for voltage measurement, then measurement reliability is improved, but phase errors are introduced causing measurement precision to deteriorate
Solution Approach 1:
The system performs preliminary identification of time constants for each filter circuit connected to battery cells. Based on these time constants, the system determines optimal sampling times before actual voltage measurements are taken. This preliminary timing adjustment compensates for phase errors introduced by the filter circuits, ensuring that voltages from multiple cells are sampled at synchronized phases despite different RC time constants in their respective filter circuits.
2Measurement precision
If sampling is performed at different times for different battery cells, then phase errors are compensated, but sampling time coordination complexity increases
Solution Approach 1:
The system changes the timing parameter for each filter circuit based on its identified time constant. Each sampling operation is performed at a specific time determined by the RC time constant of its corresponding filter circuit. This parameter adjustment synchronizes the phases of sampled voltages from multiple battery cells, compensating for phase errors without requiring complex coordination mechanisms.
Data Source
AI summary
Systems and methods for compensating phase errors in battery cell voltage measurement systems is generally described. The method can include identifying a plurality of time constants corresponding to a plurality of filter circuits connected to a plurality of battery cells. The method can further include determining, based on the plurality of time constants, a plurality of sampling times for the plurality of filter circuits. The method can further include sampling voltages from the plurality of battery cells according to the plurality of sampling times to compensate phase errors among the voltages being sampled from the plurality of battery cells.