# Chinese EV giant BYD is rethinking plug-in hybrid packaging with its new “Heyuan’ platform.

*semiconductor · news · 2026-05-02 · Interesting Engineering*

## Key points

- BYD's new Heyuan platform relocates the exhaust silencer to the front engine bay.
- This change enables significantly larger battery installations, with the Denza D9 supporting up to 66.48 kWh.
- The new layout adds about 4.4 cubic feet of rear storage, boosting total cargo to 31.1 cubic feet.
- Integrating the exhaust in the engine bay required new solutions for thermal and acoustic management, involving several patents.
- Heyuan allows flexible battery scaling beyond 100 kWh, a first for MPV plug-in hybrids.

**Companies:** BYD
**Countries:** China

[Read the full story on Interesting Engineering](https://interestingengineering.com/transportation/chinas-byd-moves-exhaust-for-larger-batteries)

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