Battery Module Leakage Detection via Current Comparison
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Solution Overview
Problem
High-power, large-capacity battery modules in electric vehicles are prone to insulation damage from high-temperature and high-vibration environments, leading to current leakage, which can cause electric shock, performance degradation, and fire.
Innovation Solution
An apparatus and method for detecting leakage current in battery modules, including a current measurer to measure currents at both ends, a leakage detector to determine current leakage by comparing magnitudes, and a damage detector to calculate insulation damage, generating warnings or power cutoff signals based on threshold differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If battery modules are used in high-temperature and high-vibration environments, then power and capacity are improved, but insulation damage and current leakage occur
Solution Approach 1:
The patent implements preliminary detection of insulation damage by continuously monitoring current at both ends of the battery module. The system detects insulation degradation before it progresses to severe current leakage, enabling preventive maintenance and avoiding catastrophic failures in high-temperature and high-vibration environments.
2Power
If battery modules are used in high-temperature and high-vibration environments, then power and capacity are improved, but current leakage occurs
Solution Approach 1:
The patent employs a feedback mechanism where current measurements from both ends of the battery module are continuously monitored and compared. When insulation damage is detected through current imbalance, the system generates warnings or cutoff signals to prevent harmful current leakage, creating a closed-loop safety system that actively responds to degradation.
3Measurement precision
If current leakage is detected by measuring current at both ends, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The patent utilizes the battery module's own operating current as the detection signal. By measuring current at both ends during normal operation and comparing the values, the system detects insulation damage without requiring separate test signals or additional excitation sources. This self-service approach achieves accurate detection while minimizing added complexity.
Data Source
AI summary
An apparatus for detecting leakage current of a battery module includes a current measurer configured to measure currents at both ends of a battery module, and a leakage detector configured to determine whether current is leaking out of the battery module based on the measured currents.