Tesla Cybercab teardown reveals wireless BMS, no pyro fuse, no refrigerant lines
PTrubey · x · 2026-10-27
A walkthrough of Tesla Cybercab engineering highlights several notable design choices:
- Wireless battery management: each of the 4 battery modules has its own BMS board reporting via radio to the battery controller, replacing a centralized BMS and piles of sense wires — a BOM cost and manufacturing efficiency win.
- No pyro fuse: after eliminating low-voltage fuses via power semiconductors years ago, Tesla has now done the same for the high-voltage main pack. In low-speed crashes the battery can be isolated and re-enabled if no high-voltage faults are detected, cutting maintenance costs.
- No e-coatings on most castings: Tesla's special aluminum alloys are robust enough to skip coatings.
- No refrigerant routed through the car, unlike every other vehicle.
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