Battery Pack Warning Logic for Pressure-Voltage Abnormalities
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Solution Overview
Problem
Existing methods for detecting abnormalities in vehicle-mounted batteries cannot reliably distinguish between abnormalities of low and high importance, often failing to accurately detect critical issues like thermal runaway due to reliance on internal air pressure alone, which can be influenced by altitude and cooling factors.
Innovation Solution
A battery abnormality warning system that uses both air pressure and voltage sensors to determine if a pressure abnormality and voltage abnormality have occurred within a prescribed time period, outputting a warning to the vehicle occupant when both conditions are met, thereby distinguishing between low and high-importance abnormalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If only air pressure inside the battery is used for abnormality detection, then the detection system remains simple, but the ability to distinguish between low-importance and high-importance abnormalities is lost
Solution Approach 1:
The patent combines pressure abnormality detection and voltage abnormality detection into a unified abnormality determination system. The controller integrates data from both pressure sensors and voltage sensors to make comprehensive abnormality judgments, merging multiple detection functions into a single coordinated system that improves reliability while managing complexity through integrated design.
Solution Approach 2:
The controller is designed to perform multiple functions: monitoring pressure abnormalities, monitoring voltage abnormalities, and determining overall battery abnormalities by combining both data sources. This multi-functional approach allows a single device to handle diverse detection tasks, improving abnormality identification accuracy without proportionally increasing system complexity.
2Measurement precision
If pressure-based detection alone is used, then the system responds quickly to pressure changes, but it cannot distinguish between temporary pressure fluctuations and critical abnormalities
Solution Approach 1:
The system performs preliminary monitoring of both pressure and voltage parameters continuously, maintaining readiness to detect abnormalities. By having both detection systems active and prepared in advance, the system can quickly determine abnormalities when they occur without requiring additional analysis time, thus preventing time loss while ensuring precise identification.
Solution Approach 2:
The controller continuously receives feedback from both pressure sensors and voltage sensors, comparing real-time data against abnormality thresholds. This feedback mechanism allows the system to rapidly identify when both parameters simultaneously indicate an abnormality, enabling quick and precise detection of critical conditions like thermal runaway while filtering out temporary fluctuations that don't trigger both sensors.
Data Source
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AI summary
The battery abnormality warning method according to the present invention involves detecting an abnormality in a vehicle-mounted battery and warning an occupant in the vehicle, the battery abnormality warning method being such that a determination as to whether a pressure abnormality has occurred in the battery is made on the basis of an air pressure inside a battery pack of the battery, a determination as to whether a voltage abnormality has occurred in the battery is made on the basis of a cell voltage of the battery, an abnormality is determined to have occurred in the battery when both a pressure abnormality in the battery and a voltage abnormality in the battery are determined to have occurred within a prescribed time period, and a warning is outputted to the occupant in the vehicle when it is determined that an abnormality has occurred in the battery.