Optical Sensing of Battery Faults

摘要

1. Developed battery sensor to detect local faults based on optical transmission through separator 2. Modeling showed concept feasibility, and set bounds on transmission loss, scattering, particle size, and optical loss 3. Optical performance of separator can be improved to an acceptable level by a. minimizing spatial variations in index of refraction b. using an index-matched fluid 4. Initial testing demonstrated detection of sub-millimeter metal particles 5. Results show concept should work well for cells up to 6 inch separator. 6. Low cost sources and detectors are used within the battery cell, and designed with a ray tracing model.