In recent months, it's become increasingly clear that major manufacturers are placing greater emphasis on battery safety in the face of frequent battery fires. Following the Tesla and NIO fires, and NIO's recall of over 4,000 ES8 vehicles, the question of whether emerging electric vehicle manufacturers should slow down their pace of development has become a focal point of debate. Even without so many fires, battery safety has always been the most crucial component of electric vehicle safety.
A closer look at numerous cases of spontaneous combustion reveals a multitude of possible causes for battery thermal runaway. These include purely hardware factors: impacts, internal or external short circuits, or a chain reaction in the entire battery pack caused by the thermal runaway of a single cell. Software-related factors can also contribute, such as overcharging, excessive voltage or current, or a malfunctioning active cooling system.
This is why, from a hardware perspective, the selection of individual battery cells, the structure and materials of the battery pack, its detailed layout on the vehicle body, and the design of the cooling system all affect battery safety. For example, Tesla's battery pack, which is laid flat on the central floor, is more susceptible to damage from chassis scrapes.
At the software control level, the effectiveness of detailed temperature monitoring of the battery pack will affect battery safety, and the recent spontaneous combustion incident of NIO is the most direct example.
Due to the instability of high-voltage batteries and the frequent spontaneous combustion incidents, major OEMs have been working on improving battery packs from both hardware and software perspectives in the past two years, especially in safety-related designs. On the hardware side, a clear trend is emerging: the selection of individual battery cells is becoming increasingly distinct, with pouch cells gradually replacing traditional cylindrical and prismatic aluminum-cased batteries as the mainstream.
Compared to hard-shell lithium-ion batteries, pouch batteries have inherent advantages that are incomparable, including: lighter weight (approximately 20%-40% lighter than hard-shell batteries); lower internal resistance (significantly reducing self-discharge); better cycle life (longer lifespan with 4%-7% less degradation per 100 cycles); and greater flexibility (highly adaptable to various shapes, allowing for more flexible layout in vehicles).
It is precisely because of these numerous advantages that pouch batteries are highly favored among emerging electric vehicle manufacturers, including Qiantu Motors. Of course, brands like Tesla are aware of the advantages of pouch batteries, but due to their previous large-scale purchases and the fixed nature of their battery management systems, further research and development would undoubtedly incur significant costs. Therefore, they are unlikely to change their battery type for the time being.
The superior safety advantages of pouch batteries have made them the foundation for Qiantu Motors' entire lithium-ion battery technology development path. In addition, the overall safety measures of the battery pack are also crucial. Qiantu Motors pioneered the use of a standard battery box design. Because the cells undergo slight volume changes during charging and discharging, the standard battery box incorporates a buffer design between the cells to absorb the dimensional changes caused by the cell breathing effect and to form an internal buffer in the event of collisions or bumps. The outer shell of the battery box uses a high-strength composite material, making its collision performance detection results 30% higher than the national standard and meeting the IP67 protection level requirement. In the K50 model, these standard boxes are located at the bottom and rear, satisfying the power requirements while maintaining a perfect vehicle weight distribution.
With a complete battery module, a reliable electronic control system is also essential. The Qiantu K50 adopts distributed management, which is more expensive than centralized management, but it also improves battery performance and safety. The K50 mainly feeds battery information back to the slave control modules in their respective standard boxes, then processes and uploads this data to the central control unit, which finally coordinates the interaction and performs overall management of the battery pack.
Sports cars powered entirely by electric power are indeed rare, but the Qiantu K50 has realized the vision of a domestic pure electric supercar and has become the first to achieve mass production, which is believed to be a new starting point for domestic sports cars. Moreover, the Qiantu K50's battery design philosophy, from any perspective, is designed to fully ensure battery safety. In an era where spontaneous combustion incidents of new energy vehicles are frequent, this may become a breakthrough and direction for automakers to explore in the future.
