Immersion-Cooled Battery Connector for Fluid Contamination Detection
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Solution Overview
Problem
Existing methods for detecting isolation faults in immersion-cooled high voltage battery systems are inadequate to address contamination-induced dielectric breakdown, which can lead to unintended electrical connections between high voltage components and chassis ground, compromising system integrity.
Innovation Solution
Implementing high-precision current measurement techniques using shunts or advanced sensors to detect minute current flows in the cooling fluid, integrated with a Battery Management System (BMS) for real-time monitoring and fault diagnosis, enabling precise localization and classification of contamination levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional isolation fault detection methods are used, then chassis ground isolation faults can be detected, but dielectric breakdown in cooling fluid caused by contamination cannot be detected
Solution Approach 1:
The patent segments the detection function into two independent detection paths: traditional isolation fault detection for chassis ground connections, and a new dielectric breakdown detection path for cooling fluid contamination. This segmentation allows each detection method to be optimized for its specific detection target without interfering with the other, thereby improving both reliability and adaptability of the overall detection system.
Solution Approach 2:
The patent introduces an intermediary measurement approach by measuring current flow through the cooling fluid as an intermediate indicator of dielectric breakdown. Instead of directly detecting dielectric properties, the system uses current measurement as an intermediary parameter that correlates with contamination levels, enabling indirect but effective detection of dielectric breakdown while maintaining compatibility with existing detection architectures.
2Measurement precision
If high-precision current measurement techniques are implemented, then dielectric breakdown can be detected early, but system complexity increases
Solution Approach 1:
The patent implements multi-functionality by enabling the existing current measurement infrastructure to serve dual purposes: traditional isolation fault detection and the new dielectric breakdown detection. By configuring existing sensors and circuitry to perform multiple detection functions, the system achieves high measurement precision for contamination detection without proportionally increasing device complexity, as the same hardware resources are leveraged for multiple detection objectives.
Solution Approach 2:
The patent establishes a feedback mechanism where measured current values are continuously compared against threshold values that indicate dielectric breakdown. This feedback approach enables automatic detection and alerting without requiring complex real-time analysis systems, maintaining relatively simple device architecture while achieving high measurement precision through continuous monitoring and threshold-based decision making.
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
Enhances detection accuracy and reliability by identifying dielectric breakdown early, allowing for proactive fault management and maintaining vehicle functionality through tiered response actions, from minor adjustments to complete vehicle inhibition.
Implementation Method 1
detect a voltage drop across the sensing component when a contamination level in the cooling fluid reaches a threshold that increases electrical conductivity of the cooling fluid
Implementation Method 2
detect a change in dielectric properties of the cooling fluid when a contamination level in the cooling fluid reaches a threshold that alters dielectric strength of the cooling fluid
Data Source
AI summary
An electrified vehicle system is presented. The electrified vehicle system has a traction battery incorporating a plurality of electrically connected array modules submerged in a cooling fluid. A sensing component, coupled with at least one array module and immersed in the cooling fluid, is configured to detect a voltage drop when the fluid's contamination level reaches a threshold, thereby increasing electrical conductivity. This sensed voltage drop is communicated to a traction battery monitoring system, enabling proactive management of cooling fluid integrity.