Battery Cell Monitoring via Temperature-Dependent Pressure Thresholds
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Solution Overview
Problem
Existing battery cell monitoring methods face challenges in accurately detecting critical states due to the dependence of pressure on temperature, leading to false positives or late detections, as pressure thresholds are often set too high to avoid false alarms and account for temperature variations during normal operation and service life.
Innovation Solution
A method that measures pressure inside the battery cell and determines a corresponding temperature value using a relationship between pressure and temperature, which can be linear or nonlinear, taking into account the battery's state of charge and service life, allowing for more timely and accurate monitoring by using internal or external temperature sensors for calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the critical pressure threshold is set relatively high to avoid false detections, then the number of false positives is reduced, but the detection of critical states is delayed and may be too late
Solution Approach 1:
The patent transforms the pressure threshold from a fixed value to a temperature-dependent dynamic threshold. By using the relationship between pressure and temperature (stored as calibration data), the system adjusts the critical pressure threshold based on the actual cell temperature, enabling early detection without false positives.
2Loss of time
If the critical pressure threshold is set relatively low to enable early detection, then critical states are detected earlier, but false detections occur during normal operation
Solution Approach 1:
The system changes the threshold parameter from static to dynamic by incorporating temperature compensation. The critical pressure threshold is adjusted according to the measured cell temperature and stored relationship data, allowing the threshold to be low enough for early detection while remaining high enough to avoid false positives at different temperatures.
Solution Approach 2:
Temperature serves as an intermediary parameter that mediates between the pressure measurement and the critical state determination. By introducing temperature as an intermediate factor, the system can distinguish between pressure increases due to normal thermal expansion and those indicating actual critical states.
3Device complexity
If a fixed pressure threshold is used for monitoring, then the monitoring system is simple to implement, but it cannot account for temperature variations and service life changes
Solution Approach 1:
The patent applies preliminary action by pre-determining and storing the pressure-temperature relationship during battery calibration or manufacturing. This calibration data is stored in memory and used during operation to dynamically adjust the critical pressure threshold, eliminating the need for complex real-time calculations while maintaining high detection accuracy.
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 enables earlier detection of critical states, reduces false alarms, and provides more reliable monitoring by considering the battery's service life and state of charge, allowing for timely intervention to prevent damage.
Implementation Method 1
the pressure inside a battery cell is (highly) dependent on the temperature
Data Source
AI summary
A method for monitoring a battery cell is provided. The method measures a first value corresponding to a pressure inside the battery cell. The method also determines a second value on the basis of the first value. The second value corresponds to a temperature of the battery cell. The method monitors the battery cell on the basis of the second value. It is possible to determine whether the battery cell is in a fault-free state or in a state which is faulty, problematic, or critical.