Battery Array Voltage Deviation Monitoring for Cell Degradation Detection
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Solution Overview
Problem
Existing methods for detecting battery cell degradation in high-voltage multi-array batteries are computationally intensive and time-consuming, making it challenging to accurately identify individual cell degradations in a battery pack, especially in vehicles with numerous cells, and calibration is difficult due to the high voltage and power requirements.
Innovation Solution
Monitor the rate of change of the difference in maximum cell voltage deviation for an array of cells during plug-in charging, aborting the charging process and recording a diagnostic trouble code when the rate exceeds a predetermined threshold, reducing computational demand by calculating deviations at the array level rather than individual cell level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If battery cell degradation is monitored at the battery cell level by calculating voltage rate of change for each cell, then detection accuracy is improved, but computational load and detection time increase significantly
Solution Approach 1:
The battery pack is divided into multiple arrays, and degradation monitoring is performed at the array level rather than individual cell level. Each array's maximum cell voltage deviation is calculated and monitored, segmenting the computational task into manageable units while maintaining sufficient detection accuracy for high-voltage battery packs.
Solution Approach 2:
The method extracts only the critical parameter (maximum cell voltage deviation) from each array for monitoring, rather than processing all individual cell data. This extraction of essential information reduces computational complexity while preserving the ability to detect degradation events.
2Measurement precision
If battery cell degradation is monitored at the battery cell level, then individual cell degradations can be identified, but detection time increases excessively
Solution Approach 1:
The battery pack is segmented into multiple arrays, allowing parallel monitoring of maximum voltage deviations across arrays. This segmentation enables faster detection by distributing the computational workload and identifying degradation events at the array level, which is sufficient for high-voltage battery packs where individual cell identification is less critical than overall pack health.
Solution Approach 2:
The method monitors maximum voltage deviation across the entire array rather than attempting to identify every individual degraded cell. This partial action approach accepts that not every single degraded cell will be pinpointed, but ensures timely detection of degradation events that could affect pack performance or safety.
3Measurement precision
If calculations are performed on individual battery cells, then degradation detection accuracy is improved, but the number of computations increases
Solution Approach 1:
The computational task is segmented from individual cell level to array level. For each array, only the maximum cell voltage deviation is calculated and monitored, reducing the number of computations from hundreds of individual cells to a manageable number of arrays while maintaining sufficient detection accuracy for high-voltage battery systems.
Solution Approach 2:
The method extracts and monitors only the maximum voltage deviation parameter from each array, filtering out unnecessary individual cell data. This extraction focuses computational resources on the most critical degradation indicator, improving computational efficiency without sacrificing essential detection capability.
Data Source
AI summary
Methods and systems are provided for a high-voltage multi-array battery of a plug-in vehicle. In one example, a method may include monitoring a rate of change of a difference in a maximum cell voltage deviation for at least one array of cells of the high-voltage multi-array battery exceeding a predetermined threshold. In response to the rate of change exceeding the predetermined threshold, plug-in charging is aborted and a diagnostic trouble code (DTC) is recorded in a memory of the vehicle.