New energy vehicles, as a significant breakthrough in modern transportation technology, are fundamentally about replacing traditional fuels with electricity to achieve efficient and clean power output.
Unlike traditional fuel vehicles, new energy vehicles are primarily composed of three core modules: a power system, an electric drive system, and auxiliary systems. These three systems work together to achieve vehicle operation and control.
The power system is the "energy heart" of a new energy vehicle, responsible for storing and supplying electrical energy. Its core component is the battery pack, currently primarily using lithium-ion batteries, such as ternary lithium batteries and lithium iron phosphate batteries. Multiple cells are connected in series and parallel to form a high-voltage DC power supply, providing power to the entire vehicle.
The battery does not operate in isolation; its performance and lifespan are monitored throughout by a battery management system (BMS). The BMS collects key parameters such as voltage, current, and temperature in real time, enabling precise charge and discharge management, thermal balance control, and fault warnings, effectively extending battery life and ensuring driving safety.
In addition, the on-board charger is responsible for converting AC grid power into DC power suitable for the battery, supporting both slow and fast charging modes. Some models are also equipped with a DC fast charging interface, which can replenish more than 80% of the battery capacity within 30 minutes.
What are the core technologies of pure electric vehicles?
Developing electric vehicles requires solving four key technologies: battery technology, motor drive and control technology, electric vehicle overall technology, and energy management technology. Battery Technology: Batteries are the power source of electric vehicles and have always been a key factor restricting their development. The main performance indicators of batteries used in electric vehicles are specific energy (E), energy density (Ed), specific power (P), cycle life (L), and cost (C). To enable electric vehicles to compete with gasoline vehicles, the key is to develop high-efficiency batteries with high specific energy, high specific power, and long service life.
Electric Drive and Control Technology: The electric motor and drive system are key components of electric vehicles. To ensure good performance, the drive motor should have a wide speed range, high speed, large starting torque, small size, light weight, high efficiency, strong dynamic braking, and energy regenerative braking characteristics. Currently, electric motors used in electric vehicles mainly fall into four categories: DC motors (DCM), induction motors (IM), permanent magnet brushless motors (PMBLM), and switched reluctance motors (SRM).
Compared to traditional internal combustion engine vehicles, electric vehicles have the following advantages: Environmentally friendly and energy-saving: Electric vehicles require no fuel, only electricity, thus eliminating exhaust pollution and making them more environmentally friendly. Furthermore, electric vehicles have higher energy efficiency, saving energy. High efficiency and low noise: Electric vehicle motors have high speed and large torque, enabling rapid response to driver input while maintaining low noise levels for a more comfortable driving experience. Low maintenance costs: Electric vehicle motors have a simple structure, lacking the complex components of traditional engines and transmissions, resulting in lower maintenance costs. High flexibility: Electric vehicle motors can be adjusted according to driver needs, enabling more flexible driving styles. Energy recovery: Electric vehicle motors can recover braking energy to recharge the battery, thereby extending its actual driving range.
