BYD EV teardown in Japan reveals secrets to its affordability

BYD design & cost structure

• Main technical takeaway: BYD integrates motor, inverter, gearbox, charger, DC‑DC, BMS, etc. into a single “E‑Axle” / drive unit, reused across multiple models for scale and cost reduction.
• This modular subassembly simplifies manufacturing (few big plug‑in units instead of many scattered components) and shifts powertrain focus from engines to integrated axles and HV electronics.
• Similar strategies exist (e.g., GM Ultium), but BYD appears particularly aggressive in integration and vertical in‑house production.

Repairability & longevity

• Critics argue this high integration implies poor repairability: failure of one small part may require replacement of the whole unit, risking early scrappage and higher lifecycle cost/emissions.
• Others counter that common assemblies across high volumes improve parts availability and workshop expertise and that many modern cars are already hard to repair.

Chinese vs Western EV economics

• Explanations for BYD’s low prices: economies of scale, lower labor costs, looser regulations, strong state support, and a hypercompetitive domestic market focused on EVs early.
• Western EVs are seen as expensive due to higher labor and regulatory costs, but also because legacy automakers chase high-margin SUVs and upmarket EVs, underinvesting in cheap models.
• Debate over the size of Chinese subsidies vs US/EU support; consensus that all major regions subsidize EVs, but disagreement on relative magnitude.

Quality, safety & country of origin

• Several comments report excellent build quality from Chinese-built vehicles (including Western brands), sometimes better than US/EU plants.
• BYD models sold in Europe receive strong crash-test ratings, though some Chinese cars are described as unsafe.
• Thread stresses that “national origin = quality” is an oversimplification; design, QC, and target market matter more.

User experience: simplicity vs features

• Some want ultra-simple EVs (no touchscreens, minimal electronics, diesel heaters), arguing for longevity and ease of repair.
• Others explain that once a screen and computer are required (e.g., for backup cameras), touch UIs are often cheaper than many physical switches and easier to adapt across markets.
• Chinese EVs, even cheap ones, tend to be feature-rich with multiple screens.

Policy, subsidies & industrial strategy

• Strong disagreement on tariffs: some see them as necessary to preserve domestic industry and military-relevant manufacturing; others see them as consumer-hostile protection for complacent incumbents.
• Broader concern that Western firms are “financialized” and short‑termist, while China’s state-backed approach is enabling rapid EV and battery leadership.