Xiangyang Tenglong Automotive Launches New Battery Management Protection System for Hybrid Energy Vehicles

Addressing Critical Safety Challenges in Hybrid Energy Vehicles

Hybrid energy vehicles serve as a vital bridge between traditional fuel-powered cars and pure electric vehicles. However, lithium-ion batteries—despite their advantages—remain highly sensitive to overcharging and over-discharging. Improper use can easily damage individual cells, and in severe cases, lead to spontaneous combustion. Ensuring battery safety is therefore a core technical challenge in the electrification of transportation.

To solve this, the engineering team at Xiangyang Tenglong Automotive has developed a comprehensive battery management protection system that safeguards battery packs while protecting driver and passenger safety.

Engineering Excellence: Intelligent Protection and Real-Time Monitoring

The RD04 project introduces several advanced technical features designed for reliability and safety:

▸ Mechanical Impact Sensing: A push rod mechanism is integrated into the housing, featuring a push plate, fixed plate, and a second spring positioned between the sleeve and the fixed plate. A pressure sensor is installed on the right side of the piston, allowing the push rod to actively engage the sensor.

▸ Preset Sensor Threshold: The pressure sensor is pre-calibrated with an initial value, ensuring that power is only disconnected when a significant impact occurs. This design effectively prevents unintended shutdowns caused by sudden braking or minor collisions.

▸ Advanced State-of-Charge Estimation: An improved current integration method is used to accurately estimate battery state of charge, while a multi-transformer equalization circuit enables bidirectional charging balancing for individual cells.

Comprehensive Safety Architecture

The system provides multiple layers of protection, including leakage current protection, insulation resistance monitoring, collision-triggered power cutoff, and fault diagnosis for battery operation. These features work together to ensure safe battery operation and protect occupants in emergency situations.

Proven Results and Intellectual Property

The project has successfully been granted a national utility model patent: A Practical Collision Power-Off Device for Automobiles (Patent No. ZL201721904478.2). The device uses a combination of first and second electromagnets, conductive plates, and springs to maintain normal power supply under standard conditions while enabling rapid disconnection upon collision. The final evaluation committee—led by General Manager Ye Lizhang—concluded that the project has met all technical indicators and significantly enhanced high-voltage system safety.

Commitment to Advanced Safety Solutions

With a total R&D investment of 1.48 million RMB, the RD04 project underscores Xiangyang Tenglong Automotive’s ongoing commitment to safety innovation. The protection device is already planned for integration into the company’s own engineering vehicles, ensuring battery operational safety and enhancing occupant protection. By embedding active battery management technologies into our new energy buses, logistics vehicles, and specialty vehicles, we continue to set new benchmarks for safe and intelligent green transportation.

Xiangyang Tenglong Automotive: "Building good cars with a craftsman's heart."

RD04 Project Initiation Report for the Design of a New Hybrid Energy Vehicle Battery Management Protection System Device