Inside BYD: CT scans reveal the engineering behind a vertically integrated EV maker

Lumafield’s industrial CT scans dissect four BYD components — a Blade-chemistry LFP prismatic battery cell, the Tang SUV’s driver-door switch panel, the Type 2 IC-CPD portable charger that ships with European cars, and a key fob shared across the lineup. Each scan illustrates how BYD’s vertical integration shows up at the part level: the company designs its own LFP chemistry (iron-based, more stable and cycle-tolerant than nickel-manganese-cobalt cells, at the cost of energy density), consolidates mirror, window, lock, and child-safety controls into a single LIN-networked module, and standardizes one key architecture across sedans, hatchbacks, and SUVs.

The scans also surface manufacturing tells and design trade-offs invisible from the outside. The prismatic cell uses two parallel jellyrolls for better current distribution, but rippled electrode windings hint at uneven tension during assembly — a defect that can accelerate degradation. The Tang’s switch panel reduces parts count but funnels every mirror, window, and lock signal through a single 14-pin connector, a known automotive failure point. The IC-CPD’s seven-pin Type 2 housing carries only one active power conductor, with onboard ground-fault, overcurrent, and thermal protection sized for the reality that household sockets were never built for sustained EV charging.

Together the teardowns map BYD’s engineering philosophy: cheaper, more stable chemistries; fewer subassemblies with more software; and consistent reuse across the product line. The trade-offs — lower energy density, single-point connector failures, mechanical key fallbacks — are deliberate choices, not oversights.