The use of cooling systems in electric vehicle battery pack systems increases the risk of water leakage and 
Source: Amphenol Advanced Sensorsattendant hazards in lithium-ion battery packs. A coolant leak detection sensor from Amphenol Advanced Sensors can detect moisture leakage via a change in resistance value and signal the battery management system to warn the driver.
The sensor operates in a -40° C to 85° C temperature range on standard 5V power and can detect as little as 2.8 mm of standing water in the bottom of the battery pack enclosure. For diagnostics, the device includes a 510 kΩ resistor in parallel with two plated contacts for open/short circuit detection. A small footprint allows for various mounting positions, along with custom length wire leads and connector options.
The coolant leak detection sensor is validated against aggressive automotive standards and includes 2D barcode for full traceability requirements. Additional applications for the sensor include leak detection from a burst pipe or in tank fill applications, use as a condensate overflow sensor for HVAC systems, and in sump pumps.
