Battery Fault Diagnosis Using Weighted FDC Voltage Deviation
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Solution Overview
Problem
The existing battery fault diagnosis methods require numerous iterations to reach diagnosis enabling or disabling conditions due to fixed step-up or step-down sizes for the fault detection counter (FDC), leading to prolonged waiting times, especially in critical situations like thermal or isolation events.
Innovation Solution
A battery fault diagnosis device and method that applies weightings to the increase or decrease of the FDC value based on voltage deviation, adjusting the counter step size dynamically to quickly reach diagnosis enabling or disabling conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fixed step-up or step-down size is used for FDC, then the diagnosis method is simple to implement, but the waiting time to reach diagnosis enabling or disabling conditions lengthens
Solution Approach 1:
The patent applies dynamic adjustment of FDC step size based on voltage deviation magnitude. When voltage deviation exceeds a threshold, a larger step size (e.g., 5) is applied; when within threshold, a smaller step size (e.g., 1) is used. This dynamic approach resolves the contradiction by adapting the step size to the severity of the anomaly, achieving both operational simplicity and reduced waiting time.
Solution Approach 2:
The patent changes the parameter of FDC step size based on voltage deviation conditions. By setting different step sizes (1 or 5) according to whether voltage deviation exceeds a threshold, the system optimizes the balance between implementation simplicity and diagnosis speed, resolving the technical contradiction.
2Loss of time
If large step-up or step-down size is used for FDC, then the time to reach diagnosis condition is reduced, but the precision of fault detection decreases
Solution Approach 1:
The patent applies different step sizes in different local conditions: when voltage deviation is small (within threshold), a small step size (1) is used for precise detection; when voltage deviation is large (exceeds threshold), a large step size (5) is used for rapid response. This local differentiation resolves the contradiction between speed and precision.
Solution Approach 2:
The patent dynamically adjusts the FDC step size based on real-time voltage deviation measurements. This dynamic adaptation allows the system to switch between precision mode (small steps) and speed mode (large steps), resolving the contradiction between measurement precision and diagnosis time.
3Measurement precision
If small step-up or step-down size is used for FDC, then the precision of fault detection is maintained, but the waiting time to reach diagnosis condition lengthens
Solution Approach 1:
The patent changes the FDC step size parameter based on voltage deviation conditions. By setting step size to 1 when voltage deviation is within threshold (maintaining precision) and to 5 when exceeding threshold (reducing time), the system resolves the contradiction between precision and time through conditional parameter adjustment.
Data Source
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AI summary
The present invention relates to a battery fault diagnosing device and a method of determining a fault detection counter (FDC) value by applying a weighting, and the battery fault diagnosing device of the present invention may include a measuring unit that generates measurement data on the cell voltage of each of a plurality of battery cells included in the battery pack, an FDC determining unit that increases an FDC value with an increase inclination or decreases the FDC value with a decrease inclination on the basis of the result of comparison between the measurement data and a predetermined threshold voltage value, a weighting determining unit that determines a target weighting to be applied to the increase inclination or the decrease inclination, on the basis of the FDC value at the time of applying the increase inclination or the decrease inclination and the magnitude of a voltage deviation obtained by subtracting the threshold voltage value from the measurement data, and a DTC setting unit that sets a diagnostic trouble code (DTC) value corresponding to the FDC value to a first value indicating that the battery pack is abnormal, when the FDC value reaches a predetermined upper limit threshold, and sets the DTC value corresponding to the FDC value to a second value indicating that the battery pack is normal, when the FDC value reaches a predetermined lower limit threshold.