Battery Module Open-Wire Detection Using Even-Odd Cell Comparison
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Solution Overview
Problem
Existing methods for detecting open wire faults in battery modules, particularly in electric vehicles, are prone to false positives due to significant load profile changes, leading to inefficient use of resources and potential safety risks.
Innovation Solution
The method involves simultaneous measurement of voltage in battery cells with enabled and disabled pull-up resistance to determine the relationship between these measurements, comparing them to predefined thresholds to accurately detect open wire faults, thereby reducing susceptibility to load variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional open wire fault detection methods are used, then fault detection capability is provided, but false positives increase due to load profile changes
Solution Approach 1:
The battery cells are divided into two groups (even and odd indexed cells) with different pull-up resistance configurations. This segmentation allows the system to create distinct measurement conditions that can be compared to detect faults, reducing false positives caused by load variations affecting all cells uniformly.
Solution Approach 2:
Pull-up resistance is enabled for even indexed battery cells and disabled for odd indexed battery cells, creating local quality differences between cell groups. This asymmetric configuration allows the detection system to identify open wire faults by comparing voltage measurements from cells with different electrical characteristics, while load profile changes affect both groups similarly and can be differentiated from actual faults.
2Reliability
If pull-up resistance is enabled for all battery cells, then open wire faults can be detected, but false positives increase due to load variations
Solution Approach 1:
The system applies asymmetric pull-up resistance configuration where even indexed cells have pull-up resistance enabled and odd indexed cells have it disabled. This asymmetry creates a reference group (odd cells) that is not affected by pull-up resistance effects, allowing the system to distinguish between normal load variations and actual open wire faults by comparing measurements from the two groups.
3Reliability
If simultaneous measurement with different pull-up configurations is used, then detection reliability improves, but measurement complexity increases
Solution Approach 1:
The same measurement system and processing logic are used for both even and odd indexed battery cells, with the only difference being the pull-up resistance configuration. This universal approach allows the system to handle both cell groups through a single detection algorithm that compares voltage measurements, reducing the need for separate measurement circuits or complex control logic while maintaining high detection reliability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the reliability of open wire fault detection by minimizing false positives and ensuring timely safety responses, thus optimizing vehicle availability and safety.
Implementation Method 1
with pull-up resistance enabled for one set of cells (even or odd) and disabled for the other
Data Source
AI summary
Methods, apparatuses, or systems may be used to detect open wire faults in battery modules, such as in electric vehicles. Methods, apparatuses, or systems may include comparing voltage measurements of even and odd battery cells with pull-up resistances enabled and disabled. By taking simultaneous measurements and determining comparisons between adjacent cells, the method may compensate for load variations that may lead to false detections. The approach may be executed within a fault tolerant time interval that allows for timely safety measures to be implemented when a fault is detected.