Replaceable Battery Leakage Detection Without Sensor Interference
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Solution Overview
Problem
In vehicles equipped with replaceable batteries, multiple electric leakage detection devices can interfere with each other, leading to inappropriate detection of electric leakage.
Innovation Solution
A vehicle configuration with a first detection device in the battery and a second detection device on the vehicle body, each detecting electric leakage in different states of connection and disconnection, allowing for accurate detection without interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple electric leakage detection devices are mounted on the battery side and vehicle side, then the coverage of electric leakage detection is improved, but detection accuracy deteriorates due to interference between devices
Solution Approach 1:
The detection system is segmented into two distinct parts: a first detection device mounted on the battery side and a second detection device mounted on the vehicle side. Each device operates independently in specific states, dividing the detection function to avoid mutual interference while maintaining comprehensive coverage.
Solution Approach 2:
The system dynamically switches between different detection modes based on the connection state. When the battery is connected to the vehicle body, the second detection device operates; when disconnected, the first detection device operates. This dynamic switching ensures accurate detection without interference regardless of the operational state.
2Reliability
If electric leakage detection is performed in parallel by multiple detection devices, then detection coverage is improved, but detection reliability deteriorates due to interference
Solution Approach 1:
The detection operations are performed periodically based on the connection state between battery and vehicle body. The system alternates between using the first detection device (when disconnected) and the second detection device (when connected), ensuring reliable detection without parallel interference while maintaining continuous monitoring capability.
3Adaptability or versatility
If the battery is made detachable for replacement, then adaptability is improved, but detection accuracy deteriorates due to interference between detection devices
Solution Approach 1:
The detection function is segmented between the battery-mounted first detection device and the vehicle-mounted second detection device. This segmentation allows the battery to be detachably replaced while ensuring that detection accuracy is maintained through coordinated operation of the two devices based on connection state.
Solution Approach 2:
The system dynamically adapts its detection configuration based on whether the battery is connected or disconnected. When the battery is detached for replacement, the first detection device can independently detect leakage on the battery side, while the second device monitors the vehicle side, maintaining detection accuracy throughout the replacement process.
Data Source
AI summary
ECU executes a process including a step of determining that there is an electric leakage in the battery pack when the resistance value of the insulation resistance of the battery pack of each battery pack is equal to or less than the threshold value (NO in S102), and a step of determining that there is an electric leakage in the vehicle body (S106) when the resistance value of the insulation resistance of any of the battery packs is greater than the threshold value (YES in S102) and the resistance value of the insulation resistance of the vehicle body is equal to or less than the threshold value (S114).