Looking at 18650 lithium 3.7 battery thermal runaway early warning technology from forward development

　　Forward development is a process that starts from scratch and goes through a series of processes such as project establishment, research, design, verification, and manufacturing. This is very important for companies in the rapidly developing battery box special automatic fire extinguishing device industry. The logo can reflect the strength of its own R&D capabilities.

　　However, many companies are still unable to achieve forward development, and are still relying on patchwork, imitation, and marginalization in the market to survive (hū) (yōu) and survive (qián).

　　1. Based on positive development and focus on safety

　　From scratch, from weak to strong, from small to large, the development of Yantai Chuangwei New Energy Technology Co., Ltd. has witnessed the development of 18650 lithium 3.7 battery thermal runaway early warning technology.

　　In 2012, it was the first in China to initiate research on 18650 lithium 3.7 battery thermal runaway and monitoring and early warning technology.

　　In 2013, we collaborated with multiple scientific research institutions to conduct in-depth systematic research and development.

　　In 2014, the first prototype of the 18650 lithium 3.7 battery thermal runaway monitoring and early warning product was successfully installed.

　　In 2015, a new generation of CW1160-02 series battery box-specific automatic fire extinguishing device products adapted to IP67 standards was launched. Yantai Chuangwei New Energy Technology Co., Ltd. has entered the ranks of forward development, established a systematic and complete R&D system, and entered a period of establishing innovative capabilities. Forward development, for a company that was established not long ago, is not only time-consuming and labor-intensive, but also requires huge investments in technical and financial resources, resulting in huge costs. Why does Chuangwei New Energy insist on establishing a forward development system?

　　When studying security technology, we must consider security issues comprehensively. At the beginning of the project, Chuangwei realized that the 18650 lithium 3.7 battery thermal runaway warning technology itself is an important technology focusing on safety. The reliability of the product itself must first be ensured in order for the product to function properly. Without a systematic approach to forward development, the reliability of the product itself cannot be verified, let alone the protection of customer property and life safety!

　　Chuangwei New Energy is fully aware of the seriousness and harm of thermal runaway of power batteries. During the market research period, we visited bus companies and charging stations in Beijing, Qingdao and other places to gain an in-depth understanding of customer needs, and then formulated various product goals in a targeted manner.

　　After the project of 18650 lithium 3.7 battery thermal runaway monitoring and early warning technology was established, Chuangwei New Energy decomposed the preset goals of the product into system and component development. The forward development method is used to ensure that the developed parts meet system-level requirements and then meet the requirements of the technical conditions of the entire vehicle.

　　According to the forward development requirements, during the process of selecting and finalizing various components, the failure mechanism of the components is analyzed and verified; the subsystem composed of the finalized components is verified and the failure mechanism is analyzed and verified according to the system performance requirements. At the same time, The reliability strategy of the software is verified; after all subsystems are formed into the overall system, the overall product system verification is carried out according to the vehicle environment; after being installed into the vehicle, the EMC and various performances of the vehicle are verified.

　　This series of continuous processes are all carried out in accordance with the requirements of the systematic method of forward development. Although the development cost is high, it ensures the reliability and safety of the product and can withstand various working conditions and environmental inspections.

　　2. Lithium-ion battery thermal runaway model with advanced and effective proprietary technology

　　As the earliest researcher of thermal runaway warning and safety technology for power batteries in China and the pioneer of automatic fire extinguishing devices for battery boxes, Chuangwei created the first thermal runaway model for lithium-ion batteries in new energy, promoting the development of thermal runaway monitoring and automatic fire extinguishing technology for battery boxes. Large-scale application.

　　The lithium-ion battery thermal runaway model is divided into three dimensions: longitudinal, transverse and vertical. The vertical direction is the data redundancy of multiple sensors, that is, multiple sets of sensor data in the same environment are fitted multiple times to simulate the data representation curves of different materials and different environments; the horizontal direction is continuous time algorithm on the historical data of the sensors to eliminate noise. Interference effectively solves the problems of missed alarms, false alarms, and early warning lags in the threshold method monitoring method; vertically, different methods such as puncture and blunt needle backlog are used to simulate the thermal runaway process of different types of capacity power batteries.

　　Through three-dimensional fusion, using mathematical means and based on a large number of experiments and real operating data, we summarize the internal relationships between various variables caused by thermal runaway, and use neurological principles to form an extremely early, highly reliable, self-operating lithium-ion battery. Thermal runaway model enables early warning and intelligent control of potential battery life hazards.

　　A large number of early warning examples that occurred in actual vehicle operation have proven the effectiveness and advancement of this model, making it the core technology for current battery box thermal runaway early warning and automatic fire extinguishing.

　　Early warning example one

　　On March 12, 2017, the No. 3 battery box of the No. 3 pure electric bus of ** Bus Company reported a level 2 early warning (safety hazard level). The driver reported it to the company in time and stopped running. The collected data analysis showed that the gas content and change rate of batteries in other boxes were normal, but the gas content and change rate of No. 3 battery box were significantly higher. It is determined that the dangerous gas in the battery exceeds the standard, which may be caused by battery leakage. After joint efforts by bus companies, car companies, and battery companies, they unpacked and inspected the battery, and it was confirmed that the battery was leaking. Replace the battery and the alarm will stop.

　　Early warning example two

　　On March 19, 2017, a pure electric bus of ** Bus Company reported a Level 2 warning for Box 7. The driver promptly reported it to the company and stopped running. Data analysis determined that the dangerous gases in the battery exceeded the standard, which may be caused by battery leakage. After joint efforts by car companies and battery companies, unpacking and inspection confirmed that the battery was leaking. After replacing the battery, the alarm no longer occurs.

　　A large number of early warning examples that occurred in actual vehicle operation have proven the effectiveness and necessity of the battery box-specific automatic fire extinguishing device system.

　　3. Use forward development to break industry bottlenecks

　　For most companies, the battery box special automatic fire extinguishing device industry is an emerging industry. To develop and grow, they must quickly seize opportunities. But in Chuangwei's view, rapid development and solid technology development are not contradictory, but complementary to each other. When there is no forward development capability, products can only be developed based on experience, which often comes from market trends. Once you have forward development capabilities, you can make product planning based on market demand trends and independently develop products that meet the needs of more market segments.

　　The most important thing is that as a complete vehicle supplier, the manufacturer of the automatic fire extinguishing device for the battery box will lack the ability to develop supporting technologies simultaneously with the complete vehicle company if it does not have forward development capabilities. This is also the biggest development bottleneck currently existing in this emerging industry. Only by having the ability to develop supporting technologies simultaneously with vehicle companies can the company develop for a long time.

　　Judging from the customer feedback after the launch of Chuangwei products on the market and the comparison of similar products, Chuangwei New Energy has great courage and strategic vision in insisting on forward development.

　　First, forward development ensures the reliability of the product itself. Chuangwei products have passed the rigorous inspections of many vehicle companies and battery companies such as CATL, Yutong, Yangtze Motor, AVIC Lithium Battery, and SAIC Maxus.

　　Second, forward development ensures the safety and interests of customers. Among the market feedback information collected, only Chuangwei products have very early and accurate early warning cases to avoid accidents, while other products have no accurate early warning cases. On the contrary, some products have experienced multiple false positives, triggering complaints from customers and manufacturers, resulting in huge compensation losses.

　　Third, forward development has improved the market competitiveness of products. Chuangwei New Energy is a new entrant in the automotive industry and has no connections or accumulation of resources. However, relying on its strong product competitiveness, Chuangwei products have achieved market sales The amount and share are firmly at the forefront of the industry, and are steadily increasing year by year.

　　Fourth, Chuangwei New Energy has used its own long-term and continuous investment in scientific research to avoid harsh competition caused by imitators' simple and crude plagiarism, avoid falling into the quagmire of low-price and disorderly competition, and guide the entire industry to embark on an efficient development that focuses on research and development and quality. the road.

　　4. Guided by forward development, establish a complete R&D system

　　Chuangwei New Energy currently has a relatively complete R&D system, which is due to the establishment of three major modules of product development: one is the intelligent design module, the other is the mathematical model optimization module, and the third is the simulation verification module.

　　piece. The intelligent design module includes standardized design processes and standard design templates; the mathematical model optimization module includes advanced and practical analysis and evaluation tools and high-performance integrated computing systems; the simulation verification module includes lithium iron phosphate battery simulation verification and ternary battery simulation verification. The establishment of these three development modules is not simple. Behind it is long-term, continuous and large-scale technology accumulation.

　　After establishing these three module systems, Chuangwei New Energy has the ability to develop products forward and develop projects simultaneously with the entire vehicle.

　　Through a complete R&D system, Chuangwei not only solves the bottleneck problem of industry development, can develop products faster in response to market demand, but also continuously upgrades products.

　　As competition in the market intensifies in the future, Chuangwei's next step will be to focus on early warning critical points on the basis of ensuring continuous improvement of the basic performance of products, and push the early warning stage of thermal runaway one step further to comply with the market's requirements for thermal runaway monitoring. meet the urgent needs and strive to create safer and more efficient products.

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