The BYD Seal DM-i 1.5L 17.6 kWh (197 Hp) Plug-in Hybrid E-CVT, launched in July 2023 and produced through August 2024, represents a significant entry into the plug-in hybrid sedan market by the Chinese automaker BYD. Positioned as a mid-range offering within the broader Seal lineup, this variant combines a 1.5-liter internal combustion engine with an electric motor and a 17.6 kWh battery pack, offering both all-electric driving capability and extended range through hybrid operation. The Seal, built on BYD’s e-platform 3.0, aims to provide a compelling alternative to established players in the electric and hybrid vehicle segments, particularly within the Chinese domestic market and increasingly in export markets. The DM-i designation signifies BYD’s “Dual Motor Intelligence” hybrid technology, prioritizing efficiency and a smooth driving experience.
Technical Specifications
| Brand | BYD |
| Model | Seal |
| Type (Engine) | DM-i 1.5L 17.6 kWh (197 Hp) Plug-in Hybrid E-CVT |
| Start of production | July, 2023 |
| End of production | August, 2024 |
| Powertrain Architecture | PHEV (Plug-in Hybrid Electric Vehicle) |
| Body type | Sedan, Fastback |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (economy) – combined (NEDC) | 3.9 l/100 km (60.3 US mpg, 72.4 UK mpg, 25.6 km/l) |
| Fuel Type | Petrol / electricity |
| Acceleration 0 – 100 km/h | 8.2 sec |
| Acceleration 0 – 62 mph | 8.2 sec |
| Acceleration 0 – 60 mph | 7.8 sec |
| Emission standard | China VI |
| Gross battery capacity | 17.6 kWh |
| Battery technology | Lithium iron phosphate (LiFePO4) |
| Battery location | Below the floor |
| All-electric range (NEDC) | 121 km (75.19 mi) |
| Electric motor power | 197 Hp |
| Electric motor Torque | 325 Nm (239.71 lb.-ft.) |
| Electric motor location | Front, Transverse |
| Electric motor type | Synchronous |
| System power | 197 Hp |
| Power | 110 Hp |
| Torque | 135 Nm (99.57 lb.-ft.) |
| Engine layout | Front, Transverse |
| Engine Model/Code | Xiaoyun |
| Engine displacement | 1498 cm3 (91.41 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Number of valves per cylinder | 4 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | DOHC, VVT |
| Engine systems | Start & Stop System |
| Fuel tank capacity | 50 l (13.21 US gal | 11 UK gal) |
| Length | 4980 mm (196.06 in.) |
| Width | 1890 mm (74.41 in.) |
| Height | 1495 mm (58.86 in.) |
| Wheelbase | 2900 mm (114.17 in.) |
| Front track | 1640 mm (64.57 in.) |
| Rear (Back) track | 1650 mm (64.96 in.) |
| Minimum turning circle | 11.2 m (36.75 ft.) |
| Drivetrain Architecture | Front wheel drive. PHEV. ICE and electric motor drive the front wheels. |
| Number of gears and type of gearbox | automatic transmission E-CVT |
| Front suspension | Independent type McPherson |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| Tires size | 225/55 R17; 225/50 R18 |
| Wheel rims size | 17; 18 |
Powertrain & Engine Architecture
The BYD Seal DM-i 1.5L utilizes a parallel plug-in hybrid architecture. The core of the system is the BYD Xiaoyun 1.5-liter naturally aspirated inline-four cylinder engine, producing 110 horsepower and 135 Nm (99.57 lb.-ft.) of torque. This engine is paired with a 17.6 kWh Lithium Iron Phosphate (LiFePO4) battery pack and a front-mounted synchronous electric motor generating 197 horsepower and 325 Nm (239.71 lb.-ft.) of torque. The combined system output is 197 horsepower. The engine employs multi-port fuel injection and a double overhead camshaft (DOHC) valvetrain with variable valve timing (VVT). A key component is the E-CVT (electronically controlled continuously variable transmission), which doesn’t rely on traditional belts and pulleys but instead uses a sophisticated control system to seamlessly blend power from the engine and electric motor. This configuration allows for efficient operation in various driving modes, including pure electric, hybrid, and engine-only.
Driving Characteristics
The DM-i 1.5L variant of the Seal prioritizes fuel efficiency and a refined driving experience over outright performance. The E-CVT provides smooth, stepless acceleration, and the electric motor provides instant torque, resulting in brisk initial acceleration. While the 0-60 mph time of around 7.8 seconds is respectable, it’s noticeably slower than the fully electric Seal models or those equipped with more powerful engines. The hybrid system intelligently manages power delivery, often utilizing the electric motor for low-speed driving and supplementing it with the engine during higher demand situations. The steering is light and precise, making it well-suited for urban driving. The suspension, tuned for comfort, absorbs bumps effectively, although it may exhibit some body roll during aggressive cornering. The DM-i system excels in providing a quiet and comfortable ride, especially in electric mode.
Equipment & Trim Levels
The Seal DM-i 1.5L typically comes standard with a comprehensive suite of features, including a large touchscreen infotainment system, digital instrument cluster, automatic climate control, keyless entry, and a suite of advanced driver-assistance systems (ADAS) such as adaptive cruise control, lane keeping assist, and automatic emergency braking. Interior upholstery is generally cloth or synthetic leather, with higher trims offering genuine leather options. Optional extras often include a panoramic sunroof, premium audio system, and ventilated front seats. The dashboard layout is modern and minimalist, emphasizing the large central touchscreen. Trim levels vary depending on the market, but generally offer increasing levels of luxury and technology.
Chassis & Braking
The Seal DM-i 1.5L features a front-wheel-drive layout with an independent McPherson strut suspension in the front and an independent multi-link suspension in the rear. This suspension setup provides a good balance between ride comfort and handling. Braking duties are handled by ventilated discs at the front and solid discs at the rear, equipped with an Anti-lock Braking System (ABS). The electric power steering (EPS) system provides light and responsive steering feel. Tire sizes typically range from 225/55 R17 to 225/50 R18, depending on the trim level.
Market Reception & Comparison
The BYD Seal DM-i 1.5L has been well-received in the Chinese market, where it competes with other plug-in hybrid sedans such as the Qin Plus DM-i and the Song Plus DM-i. Critics have praised its fuel efficiency, comfortable ride, and advanced technology. Compared to the fully electric Seal, the DM-i variant offers extended range and eliminates range anxiety for drivers who may not have easy access to charging infrastructure. Compared to the higher-powered engine options within the Seal lineup, the 1.5L DM-i provides a more affordable entry point, albeit with slightly reduced performance. Reliability reports are still emerging, but BYD has a growing reputation for building durable and well-engineered vehicles.
Legacy
The BYD Seal DM-i 1.5L represents a key step in BYD’s strategy to become a global leader in electric and plug-in hybrid vehicles. The DM-i technology, with its focus on efficiency and smooth operation, is likely to become a mainstay in BYD’s future models. As the used car market matures, the Seal DM-i 1.5L is expected to hold its value well, particularly due to its fuel efficiency and the growing demand for plug-in hybrid vehicles. The longevity of the LiFePO4 battery pack is a significant factor in its long-term reliability and appeal to potential buyers.
