BYD, Geely, and Changan Joint Battery Safety Technology Wins National Science and Technology Award

Recently, the 'High-Safety, Long-Life Power Battery System' project jointly undertaken by BYD, GEELY, and Changan received the State Science and Technology Progress Award (Engineering Category). This award does not recognize a single enterprise but instead serves as authoritative validation of cross-industry collaborative innovation — the project was completed jointly by Changan Automobile, China Automotive Engineering Research Institute (CAERI), CALB, and BYD — marking a new phase of standardization for foundational safety technologies in China's new-energy vehicle sector.

The awarded core technology focuses on battery thermal management and software control protocols. To address the challenges of high-current fast charging — including intense heat generation — the project developed a millisecond-level temperature-tracking software system: vehicle software monitors individual cell temperatures multiple times per second, automatically triggering cooling responses once temperatures approach the 65°C safety threshold. The system leaves each brand's physical battery architecture unchanged, unifying only data monitoring logic and intervention rules — thus ensuring safety while maintaining compatibility with diverse hardware designs.

For example, BYD employs elongated lithium iron phosphate (LFP) Blade Batteries integrated as structural body components; Changan prioritizes its "Golden Shield Battery", emphasizing 5,000-cycle longevity; and GEELY's validated Short-Blade Battery platform achieved a peak input power of 1,093 kW in national testing. Though differing in chemistry, packaging form, and energy density, all three platforms share the same thermal runaway early-warning and intervention software framework.

Notably, this technology has already been deployed at scale. According to official data, approximately 100,000 flash-charging vehicles equipped with this collaborative technology are now operating on domestic roads. Complementary high-voltage charging infrastructure is also expanding rapidly, with terminal station peak output capacity reaching 1,500 kW — providing essential support for high-power battery systems.

In addition, an intelligent electronic control chassis system co-developed by Tsinghua University, BYD, GEELY, and Great Wall Automobile also received an engineering award at the same level. Leveraging electro-mechanical composite braking and high-functional-safety design, the system achieves 'fail-operational' capability; optimized regenerative braking algorithms further extend range under urban driving cycles by up to 15%. On the manufacturing side, closed-loop resistance welding monitoring technology significantly reduces assembly deformation defects in high-strength steel and aluminum alloy body components.