Chongqing - Changan Automobile has begun mass production of a new-generation Battery Management System (BMS) recently, designed to improve battery status estimation, charging efficiency, and safety monitoring for electric vehicles.
The system's High Voltage Management (HVM) controller, a key BMS component, has officially rolled off the production line as part of Changan's efforts to advance its software-defined vehicle architecture.
Changan Automobile has begun mass production of a new-generation Battery Management System (BMS) recently. (Photo/Changan Automobile)
While traditional BMS mainly tracks battery status and provides safety protection, HVM serves as a key high-voltage control module that enables more precise battery estimation, smarter charging strategies and deeper integration with the vehicle’s electronic architecture.
As batteries become more powerful and charging speeds increase, advanced BMS technologies are becoming essential to balance performance, safety, and reliability.
Changan said the new-generation central domain controller-based BMS features upgrades in system architecture, algorithms, and integrated design. The company will apply the system to its latest battery series, which debuted in the third quarter of 2026 and has entered mass production on models including the new Deepal S07.
One of the major improvements lies in more accurate battery monitoring. The new BMS uses high-precision data acquisition technology to track battery conditions in real time, reducing single-cell voltage measurement errors to less than 1 millivolt, temperature monitoring errors to within 1 degree Celsius, and battery state-of-charge estimation errors to less than 1%.
These improvements provide more accurate data for vehicle energy management, helping the system better estimate remaining driving range and optimize battery usage.
The new system also improves charging efficiency through Changan's independently developed software algorithms. By analyzing battery conditions during charging, the BMS can dynamically adjust charging strategies based on battery status throughout the battery's lifecycle.
The company said the technology can reduce fast-charging time by 2.8 to 9.6 minutes while maintaining battery safety and long-term performance.
Beyond algorithm upgrades, the new BMS also adopts a different system architecture. Based on a central domain control design, it separates battery management functions from traditional microcontroller-based structures and integrates some battery management software functions into the vehicle's central control system.
This enables closer coordination between battery management and other vehicle systems, while creating more flexibility for future software upgrades.
In addition, Changan has integrated the BMS with the Cell Monitoring Unit through a more compact design. Compared with traditional connection methods, the integrated approach improves assembly efficiency by 12% and reduces the volume of related components by 8%, while lowering assembly complexity and connection losses.
The launch of the new HVM controller represents another step in Changan's development of software-defined vehicles. By improving how vehicles understand, manage, and use battery energy, the upgraded BMS aims to translate complex battery technologies into more accurate range estimates, shorter charging times, and safer driving experiences for EV users.