From：Internet Info Agency 2026-08-04 08:24:00
Most current mainstream extended-range electric vehicles (EREVs) use a 400V electrical architecture, while their battery-electric counterparts in the same model series typically adopt an 800V platform. This is not an isolated case but rather an industry-wide practice. The primary reason lies in cost control: EREVs already carry higher overall costs than their BEV versions due to the additional components—such as the range extender, fuel tank, and fuel system—and implementing an 800V high-voltage platform would further increase hardware costs by several thousand to tens of thousands of yuan. Given their generally smaller battery capacities (typically 30–40 kWh), even with an 800V system, actual charging power gains remain limited due to constraints imposed by battery C-rate and capacity, making it difficult to fully leverage the capabilities of ultra-fast chargers. In recent years, as battery-electric vehicle (BEV) charging infrastructure has improved significantly, the EREV’s traditional advantage of alleviating range anxiety has diminished, leading to declining sales. In response, some automakers have shifted toward an “EREV 2.0” strategy—equipping vehicles with larger battery packs (e.g., over 70 kWh) to extend all-electric range to 300–500 km, thereby offering a daily driving experience closer to that of a pure EV. Under this new paradigm, charging efficiency has become increasingly critical. Li Auto has taken the lead by standardizing a 72.7 kWh 5C battery paired with an 800V platform across all variants of its updated L8 model, enabling peak charging power of 420 kW and achieving a 10%–80% state of charge in just 10 minutes. However, not all large-battery EREVs adopt 800V technology. For instance, Xiaomi’s newly launched Pengcheng N70/N90 models, despite featuring up to a 76 kWh battery and delivering up to 505 km of all-electric range, still rely on a 400V platform to reduce costs associated with the tri-motor (battery, motor, and power electronics) system and maintain competitive pricing. Charging speed depends not only on voltage but also closely on the battery’s charging C-rate. Some 400V vehicles equipped with high-C-rate batteries (e.g., 3C) can achieve real-world charging performance comparable to that of 800V models. Currently, 800V platforms in EREVs remain largely confined to flagship or high-end trims, with only a few brands—such as XPeng and IM Motors—offering broader adoption across their lineups. When deciding whether to choose an 800V EREV, buyers should consider multiple factors holistically, including battery capacity, all-electric range, home charging availability, and frequency of long-distance travel. For users with reliable home charging and infrequent long trips, the practical benefits of 800V may be marginal, and the cost savings from opting for a 400V system could instead be redirected toward enhanced features or a lower purchase price.
