Battery Internal Temperature Gradient Monitoring for False Alarm Reduction
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Solution Overview
Problem
Existing battery monitoring systems in motor vehicles, particularly in low-voltage systems of electric and hybrid vehicles, face challenges in accurately distinguishing between internal battery temperature changes and external heat influences, leading to false alarms and potential premature battery disconnection, which can impair vehicle functionality and cause customer dissatisfaction.
Innovation Solution
A method that determines and monitors the internal battery temperature by calculating a temperature gradient using defined intervals and limit values, while accounting for external heat sources through ambient temperature correction, and integrates monitoring of the charging current to differentiate between internal and external heat influences, thereby reducing false alarms and improving accuracy in identifying battery degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If battery temperature is monitored using conventional sensors to detect critical states, then battery safety is improved, but false alarms occur due to inability to distinguish internal temperature changes from external heat influences
Solution Approach 1:
The patent segments the temperature monitoring function into two independent components: a first temperature sensor for monitoring battery temperature and a second temperature sensor for monitoring ambient temperature. This segmentation allows the system to separately measure internal battery temperature and external environmental temperature, enabling differentiation between actual battery thermal issues and external heat influences, thereby reducing false alarms while maintaining safety monitoring reliability
Solution Approach 2:
The patent introduces an intermediary mechanism (the temperature gradient calculation and comparison with threshold values) that mediates between the raw temperature measurements and the final alarm decision. By calculating the temperature gradient and comparing it against dynamically adjusted threshold values that account for ambient temperature, the system filters out false signals caused by external heat sources while preserving genuine battery thermal warnings
2Loss of information
If battery monitoring is implemented in low-voltage systems to detect degradation, then battery state awareness is improved, but system complexity increases
Solution Approach 1:
The patent implements a universal monitoring approach where the same temperature sensing and evaluation system serves multiple functions: detecting critical thermal states, monitoring ambient temperature influences, calculating temperature gradients, and identifying battery degradation. This multi-functional system reduces overall complexity compared to implementing separate specialized systems for each monitoring objective
Solution Approach 2:
The evaluation unit automatically adjusts threshold values based on ambient temperature measurements without requiring external calibration or complex algorithms. The system performs self-adjustment by comparing temperature gradients against dynamically modified thresholds, enabling autonomous operation that reduces information loss while maintaining manageable system complexity
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 effectively reduces false alarms and improves the accuracy of battery state monitoring, ensuring that only genuine battery degradation is detected, thus minimizing unnecessary battery disconnection and maintaining vehicle functionality while enhancing customer satisfaction.
Implementation Method 1
the internal temperature (T) of the battery is determined at defined intervals at different moments in time (k) and is transmitted to an evaluation unit
Implementation Method 2
which continuously determines a temperature gradient (TGrad) at least from the temperature values (T1, T2) by dividing the temperature change (ΔT) in an interval by the time change (Δt) in this interval
Data Source
AI summary
An internal temperature of a battery is determined at defined intervals at different moments in time and is transmitted to an evaluation unit, which continuously determines a temperature gradient at least from the temperature values by dividing the temperature change in an interval by the time change in this interval. At least one limit value for the temperature gradient is stored in the evaluation unit, and the evaluation unit generates an alarm signal when the temperature gradient determined by the evaluation unit reaches this limit value.