On June 14, 2019, a lecture themed on "Unlocking the Safety Performance of Qiantu Motor's Batteries" was held at Qiantuyi Beijing Sanlitun Store. Focusing on the power battery safety issue that consumers are most concerned about at the moment, Qiantu Motor's three-power technical expert and general manager of Huate Business Department Manager Mr. Zhai Sheng shared Qiantu Motor's complete technical development path for power batteries on site, as well as technical solutions for battery safety performance.

　　Safety first, forward thinking

　　Recently, spontaneous combustion accidents of electric vehicles have occurred frequently at home and abroad, causing consumers who are currently paying attention to new energy vehicles to raise serious doubts about the safety of electric vehicle power batteries. Measures such as limiting charging to 90% and updating the battery management system (BMS) have not dispelled these doubts. And how to reduce the risk of spontaneous combustion of electric vehicle power batteries to a lower level? This is the core content of this theme lecture.

　　Qiantu Motor's forward-looking exploration of automotive power batteries began in 2010. Deeply explore the development path of battery technology, and finally establish a technical route based on standard boxes of soft-packed batteries. Zhai Sheng mentioned: "As a vehicle developer, the safety and consistency of batteries are our first core issues to consider." Based on this goal, Qiantu Motor abandoned the cylindrical and square single cells that were the mainstream in the market at that time, and adopted soft-pack batteries that are safer and have obvious advantages in buffering and releasing runaway energy.

　　From the perspective of packaging, soft-pack batteries are packaged in aluminum-plastic film. When the uncontrolled energy inside it accumulates and reaches the explosive point, it will be slowly released through the soft shell instead of uncontrollably exploding. The heat energy generated by the millisecond-level electrochemical reaction is converted into a controllable battery outer packaging deformation of more than ten seconds, thereby achieving the uncontrolled energy release mentioned above. It also provides drivers and passengers with more ample reaction and escape time after the vehicle alarms, thereby giving the vehicle a higher safety advantage and making soft-pack batteries the cornerstone of Qiantu Motor's overall power battery technology.

　　Battery standard box provides double insurance for safety

　　After the safety foundation of the single battery was completed, Qiantu Motor adopted a design method that simultaneously focused on the safety of the overall battery module and pioneered the development of a standard battery box module structure. Inside the Qiantu standard battery box, the dynamic space of the battery cells is filled with foam. This material can absorb the size changes of the battery cells caused by the breathing effect of the battery cells, and plays an internal buffering role in the event of collisions, strong bumps, etc. . The battery box shell is made of high-strength composite materials, making its crash performance test score 30% higher than the national standard and meeting the IP67 waterproof and dustproof rating. It is worth mentioning that the sealed shell of the standard battery box can also efficiently cooperate with the battery thermal management system to ensure the consistency of the battery core temperature and ensure battery safety in all aspects.

　　In addition, each single standard battery box of Qiantu Motor is equipped with an independent thermal management system and an independent battery management system, which not only provides stronger heat dissipation performance and structural strength for the standard battery box, but also effectively realizes intelligent management of battery cells and real-time Monitor the status of the ten battery boxes throughout the vehicle's entire life cycle.

　　RESS builds a multi-dimensional battery safety prevention and control system

　　"RESS is like the dynamic energy regulation system of the human body." "We regard each battery cell as a living body." Mr. Zhai Sheng said when explaining the RESS system. Relying on high-security standard battery box packs, Qiantu Motor has developed an efficient thermal management system and a sophisticated and intelligent battery management system. The two together form a comprehensive safety performance solution for the vehicle's RESS rechargeable energy storage system. The RESS system uses an active liquid cooling/liquid heating thermal management system to ensure that each standard battery box can receive sufficient heat exchange, minimize the temperature difference between cells, effectively improve temperature consistency, and ensure the full temperature of the vehicle (- Driving safely within the range of 30℃～55℃). At the same time, in order to fully meet the reliability and durability of the battery system, Qiantu Motor uses a more sophisticated and intelligent battery management system (BMS) to perform multiple functions on the battery status, including detection, monitoring, safety protection, charging management, etc. Comprehensive monitoring provides efficient data support for battery diagnosis, improves diagnosis efficiency, maximizes the safety performance of the battery system during operation, and extends the battery life.

　　At the same time, the industry's original water chamber design and the synergy with RESS also make the Qiantu standard battery box even more powerful. According to Mr. Zhai Sheng, other manufacturers’ water-cooled power batteries for vehicles in the industry are all water-cooled, making it difficult to ensure the battery’s all-round temperature consistency. Qiantu's unique water chamber design allows the side of each battery cell to have sufficient contact area with the coolant, thereby ensuring the temperature consistency of all battery cells, and fundamentally eliminating the risk of spontaneous combustion of the battery due to thermal runaway. down to a lower limit.

　　Independently designed and built a high-consistency battery system

　　In order to ensure the consistency of battery products, Qiantu Motor built its own factory and independently designed industry-leading production lines to develop the entire battery system. It uses strict production, inspection and process standards to ensure product consistency and excellent quality. At the same time, Qiantu also extended its supervision system to raw material suppliers, and proposed that the electrolyte, metal particle raw materials, and positive and negative electrode materials required for the battery core in the same standard box system must be assembled from the same manufacturer and the same batch to avoid The differences in battery cell internal resistance and capacity caused by small differences in raw materials ensure a high degree of battery consistency from the source, thereby locking in product quality.

　　Postscript

　　Through Mr. Zhai Sheng's explanation, we can get a glimpse of Qiantu Motor's design and manufacturing philosophy. Since the beginning of car manufacturing, Qiantu Motor has taken safety as the first consideration in design. And through groundbreaking technical ideas and practices, the high safety of power battery systems is achieved. It is reported that in the future, Qiantu Motor will rely on its more than ten years of technical heritage in the power battery field to further explore comprehensive battery technology solutions and continue to provide consumers with pure electric vehicles with higher comprehensive performance and superior safety. Qiantu Motor's power battery design example not only effectively improves its own product safety, but also provides a successful example for other companies in the industry, which may lead to further improvements in product safety in the same industry.

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