EV Glossary: the jargon in every Chinese car review, explained

A BEV is the strictest definition of an electric car. There is no combustion engine anywhere in the drivetrain — the only energy source is the high-voltage battery, and the only way to replenish it is electric charging (home AC, public DC, or ultra-fast DC).

Range depends entirely on battery capacity and aerodynamic efficiency. A 100 kWh pack in a sedan can reach 600+ km on the CLTC cycle, but drops sharply in cold weather because there is no waste engine heat to warm the cabin.

In the Chinese market, BEVs dominate the urban commuter segment (NIO ET5, XPeng P7, Tesla Model 3 local production) and are pushing into premium SUVs (ZEEKR 001, Denza N7).

A PHEV combines a combustion engine with an electric motor and a battery that you can plug in. The key number is EV range — usually 50 to 100 km on a full charge, enough for most daily commutes without using any fuel.

Once the battery is depleted, the engine takes over and the car drives like a conventional hybrid, using the engine primarily and the small remaining electric capacity for boost and regeneration.

Chinese PHEVs have pushed the format farther than anyone else: BYD's DM-i system uses the engine mostly as a generator at highway speed, the Great Wall WEY V9X has a 77.7 kWh battery that gives it 363 km of pure EV range (bigger than some BEVs a few years ago), and combined ranges of 1,500-1,700 km are now routine.

An EREV (also sometimes called a series hybrid or REV) is a clever middle ground between a BEV and a PHEV. Like a BEV, the wheels are turned exclusively by the electric motor. Unlike a BEV, when the battery gets low, a small combustion engine fires up — but it doesn't drive the wheels; it runs a generator that recharges the battery on the fly.

The advantage over a PHEV is that the driving experience is pure electric all the time: instant torque, single-speed transmission, one-pedal driving. The advantage over a BEV is that you can keep going as long as you have fuel, so long trips are not limited by charging infrastructure.

Chinese brands have embraced EREV as a way to sidestep range anxiety while the national charging network catches up. The Li Auto L-series, Xpeng P7 Plus REV, AITO M9, and Voyah Free EREV are all examples — typically 200-300 km of pure EV range with a combined range of 1,000-1,600 km when you add the fuel tank.

DM-i is a hybrid architecture that blurs the line between an EREV and a conventional parallel hybrid. At urban and suburban speeds — where a conventional engine would be inefficient — the wheels are driven by the electric motor, and the engine runs at its sweet spot as a generator topping up the battery. At highway cruise — where the engine is most efficient — a clutch engages and the engine drives the wheels directly through a simple fixed gear.

The result is real-world fuel economy well under 5 L/100km for a large sedan or SUV, and pure-electric range of 50-200 km depending on the trim. The flagship implementation is in the BYD Han DM-i, Seal DM-i, and the Denza series, where combined ranges over 1,500 km are routine.

For buyers, the benefit is simplicity: you plug in at home, drive electric for your commute, and never worry about range on a long trip. For BYD, the benefit is that a small battery does most of the work — lowering cost vs a comparable BEV.

Most first-generation EVs use a 400V battery pack. To add energy quickly, you need lots of current, which means thick cables, lots of heat, and expensive thermal management. An 800V architecture cuts the required current in half for the same power, so the cables get thinner, the heat drops, and the car can accept power from the fastest chargers without throttling.

At a 480 kW charger, an 800V car can gain 10-80% state of charge in around 10 minutes. That is the practical equivalent of a 5-minute fuel stop for a gasoline car — fast enough that charging stops no longer dictate trip planning.

The tradeoff is cost: every component in the high-voltage system — motor, inverter, DC-DC, compressor, heater — has to tolerate the higher voltage. The first 800V cars were premium (Porsche Taycan, Hyundai Ioniq 5), but Chinese brands like ZEEKR, Li Auto, and XPeng have pushed the technology into the mainstream — the ZEEKR 8X, for example, uses 800V for its EV mode on the Hyper trim.

CLTC is the standardized test cycle used by the Chinese government to certify the range of EVs and PHEVs, and the fuel economy of hybrids. It replaced the older NEDC standard in 2021. Every car sold in China reports its range in CLTC terms, which is what you see on the spec sheet and in marketing materials.

The problem is that CLTC runs at lower average speeds and softer accelerations than real-world driving, so the numbers come out higher. A car rated 600 km CLTC will typically return 450-510 km in mixed real-world driving — a ~15-25% discount. If you come from a market where range is quoted in EPA or WLTP terms, translate CLTC numbers down by ~20% to get a comparable expectation.

This is not unique to China — the NEDC (Europe, 1996-2017) was similarly optimistic, and the US EPA used to be too. The trend is toward more realistic cycles, and WLTP is now the de facto standard in Europe. China is expected to tighten CLTC over the coming years.