Global Auto Dynamics Editorial
Cell-to-Body (CTB) integration is one of the most significant EV engineering shifts of the past five years.
Traditional EVs mount the battery pack as a separate module bolted beneath the floor pan. CTB dissolves that boundary: the battery's top cover becomes the vehicle floor, and the cells themselves contribute structural rigidity.
Who's Using CTB?
BYD pioneered mass-production CTB with the Seal in 2022, claiming a 20 percent improvement in torsional stiffness and a 10 mm lower floor. Zeekr followed with the 001's 'Eight-in-One' integration, and XPeng's SEPA 2.0 platform uses CTB in the G6 and X9.
Compounding Engineering Benefits
The engineering benefits compound. Lower floor means lower centre of gravity, better aerodynamics and more headroom. Structural contribution means fewer parts, less weight and improved crash energy absorption. BYD reports the Seal's frontal crash intrusion is 45 percent lower than a comparable Han EV.
The Serviceability Trade-Off
The trade-off is serviceability. Traditional packs can be unbolted and swapped. CTB packs require body-shop level intervention to remove, which complicates repair economics and total-cost-of-ownership models. Insurers in Europe have already flagged the issue.
NIO is the notable holdout, sticking with swappable packs because battery-swap is central to its business model. Most other Chinese OEMs, however, are moving toward CTB or its variants like CATL's Qilin.
The 2026 Outlook
By 2026, industry analysts expect 60 percent of Chinese BEVs to use some form of cell-to-body or cell-to-chassis integration. The technology is a decisive advantage for OEMs willing to redesign platforms from scratch, and a competitive disadvantage for those tied to legacy ICE architectures.
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