Battery Voltage Detection Verification for EV Power Limiting
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Solution Overview
Problem
Eco-friendly vehicles face reliability issues in voltage sensing, leading to unexpected battery power limitations and potential traffic accidents due to defects in specific battery cells, which are not detected by conventional systems.
Innovation Solution
A method and system for verifying battery voltage detection in eco-friendly vehicles by monitoring the discharge output and voltage differences between highest and lowest battery cells, using a battery management unit to determine abnormality and recover battery output to normal levels, ensuring safe driving conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If battery protection logic limits discharge power when cell voltage drops below preset voltage, then battery overdischarge is prevented, but vehicle may suddenly stop while driving due to voltage sensing problems or defects
Solution Approach 1:
The system performs preliminary verification of voltage sensing reliability by comparing voltage changes of multiple battery cells before activating battery protection logic. This preliminary check prevents false triggering of discharge power limitation due to sensing defects, thereby avoiding unnecessary vehicle stops while maintaining proper battery protection
Solution Approach 2:
The system continuously monitors voltage changes of battery cells and uses feedback from voltage differential comparisons to verify sensing reliability. When voltage sensing abnormality is detected through feedback comparison, the system adjusts discharge power limitation decisions accordingly, preventing false protection activation while maintaining genuine battery protection
2Device complexity
If conventional battery protection logic operates based on single voltage threshold, then simple control is maintained, but voltage sensing abnormalities cannot be detected
Solution Approach 1:
The voltage verification process is segmented into multiple independent battery cell voltage change comparisons. Instead of using a single voltage threshold, the system divides the verification into individual cell voltage differential measurements, allowing precise detection of sensing abnormalities while maintaining manageable control logic structure
Solution Approach 2:
The system performs partial verification by monitoring voltage changes of specific battery cells (including highest and lowest voltage cells) rather than requiring complete system-level verification. This partial action approach provides sufficient sensing reliability verification without excessive computational complexity
Data Source
AI summary
In a method and system for verifying battery voltage detection in an eco-friendly vehicle, the method for verifying battery voltage detection in an eco-friendly vehicle includes the steps of determining whether abnormality has occurred in voltage detection based on a voltage of a first battery cell with a highest voltage among a plurality of battery cells forming a battery at a first time point when a limited discharge output of the battery decreases at or below a threshold power while the vehicle is running and a voltage of a second battery cell with a lowest voltage at the first time point, and recovering an output of the battery to a normal output that allows the vehicle to drive normally and driving the vehicle if it is determined that the abnormality has occurred in the voltage detection.