Warning technology for thermal runaway of power cells

Editor's note: forward development is a process from scratch. It has to go through a series of processes such as project establishment, research, design, verification, and manufacturing. For enterprises in the rapidly developing battery box automatic fire extinguishing device industry, This is a very important sign that reflects the strength of its own R&D capabilities.

However, many companies are still unable to achieve positive development at the moment, and they are still relying on patchwork and imitation to fight the ball in the market.

01 Based on forward development, focusing on security

From scratch, from weak and strong, since childhood, Yantai Chuang for the development of New Energy Technology Co., Ltd. witnessed the development of power battery thermal runaway warning technology.

In 2012, the earliest project in China to study the thermal runaway and monitoring and early warning technology of power batteries.

In 2013, it jointly conducted in-depth system research and development with multiple scientific research institutions.

In 2014, the first prototype was successfully installed in the thermal runaway monitoring and warning product of the power battery.

In 2015, a new generation of CW 1160-02 series battery box automatic fire extinguishing device products adapted to the IP67 standard was launched. Yantai Chuang has entered the ranks of forward development for New Energy Technology Co., Ltd., established a systematic and complete R&D system, and entered the period of establishing innovative capabilities. Positive development, for a company that has not been established for a long time, time consuming power, but also invested a huge amount of technical power and financial resources, the cost is huge, why should create a new energy to insist on the establishment of a forward development system?

To study safety technology, we must think about safety problem comprehensively. At the beginning of the establishment of the project, it was realized that the thermal runaway warning technology of the power battery itself is an important technology that focuses on safety. It is necessary to ensure the reliability of the product itself before the product can function properly. Without the system method of forward development, the reliability of the product itself can not be verified, and it is impossible to talk about the protection of customer property and life safety!

Chuangwei new energy knows the seriousness and harmfulness of thermal runaway power cell. During the market research period, he visited many bus companies and charging stations in Beijing, Qingdao, etc., to understand customer needs in depth, and then formulated various product goals in a targeted manner.

After the power cell thermal runaway monitoring and warning technology was established, the new energy generation will decompose the default targets of the product into the development of systems and parts. The forward development method ensures that the developed parts meet the requirements of the system level and meet the requirements of the technical conditions of the vehicle.

According to the requirements of forward development, the failure mechanism of various components is analyzed and verified in the process of type selection. Verify the subsystem composed of the components, analyze and verify the failure mechanism according to the system performance requirements, and verify the reliability strategy of the software. After all subsystems form a whole system, the whole product system is verified according to the vehicle environment. After the vehicle is installed, the EMC and various properties of the vehicle are verified.

This series of continuous process is carried out according to 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 the inspection of various working conditions.

02 Advanced and Effective Proprietary Technology of Heat Control Model for Lithium-ion Battery

As the earliest researcher of thermal runaway warning and safety technology in domestic power cells and the founder of battery box automatic fire extinguishing device, it created the "Lithium-ion battery thermal runaway model" for new energy, which promoted the thermal runaway monitoring and automatic fire extinguishing technology of battery cells. Scale application.

"Lithium-ion battery thermal runaway model" is divided into longitudinal, transverse and vertical three-dimensional. Longitudinal data redundancy of multiple sensors, that is, multiple groups of sensor data in the same environment for multiple fitting, simulation of different materials, different environment data representation curve; Horizontal is a continuous time algorithm for the sensor's historical data, eliminating noise interference, effectively solving the problem of missed reporting, false alarm, and early warning delays in the monitoring method of the threshold method; Different methods such as puncture and blunt needle backlogs are used to simulate the thermal runaway process of different types of volumetric power cells.

Through three-dimensional Fusion, using mathematical methods, based on a large number of experimental and real operating data, the intrinsic relationships between various variables caused by thermal runaway are summarized, and neurological principles are used. A very early, highly reliable, self-running "lithium-ion battery thermal runaway model" was formed to achieve early warning and intelligent control of potential dangers.

A large number of early warning examples in real vehicle operation prove the validity and advanced of this model, making it the core technology of the current battery box thermal runaway warning and automatic fire extinguishing.

Example 1 of early warning

On March 12, 2017, ** Bus Company No. 3 pure electric bus No. 3 battery box reported a level 2 warning(safety risk level), and the driver reported the company in time and stopped operating. According to the data collected, the gas content and change rate of other box batteries are normal, and the gas content and change rate of No. 3 battery box are obviously Gaochu. It is judged that the dangerous gas of the battery is excessive and may be caused by the leakage of the battery. After the bus company, car companies, and battery companies made concerted efforts to dismantle the box inspection, it was confirmed that the battery leak. Change the battery, no more alarms.

Example II of early warning

On March 19, 2017, ** a bus company's pure electric bus report No. 7 box 2 early warning, the driver reported to the company in time and stopped operating. The data analysis determined that the battery's dangerous gas exceeded the standard and may be caused by the battery leakage. After the concerted efforts of the car enterprises and battery companies, the box removal inspection was confirmed to be a battery leak. After replacing the battery, no more alarm.

A large number of early warning cases in the operation of real vehicles prove the effectiveness and necessity of the battery box special automatic fire extinguishing device system.

03 Use forward development to solve industry bottlenecks

For most enterprises, the battery box special automatic fire extinguishing device industry belongs to the emerging industry. To develop and grow, we must quickly seize the opportunity wind. However, in the creative view, rapid development and solid technology are not contradictory, but complementary. When there is no positive development capability, the product can only be developed by experience, which often comes from the prevailing trends in the market. With positive development capabilities, product planning can be done according to market demand trends, and products that meet more market demand can be independently developed.

The most important thing is that as a complete vehicle supplier, the battery box production company will lack the ability to develop supporting technologies simultaneously with the vehicle company if it does not have forward development capabilities. This is also the biggest bottleneck in this emerging industry. Only with the ability to develop supporting technologies simultaneously with the vehicle enterprises, the development of enterprises can be long-term.

From the customer feedback after the product was introduced to the market and the comparison of similar products, it is very bold and strategic to create a new energy to adhere to the forward development.

First, forward development ensures the reliability of the product itself. Chuangwei passed the stringent inspection of CATL, Yutong, Changjiang Automobile, China Airlines Lithium, SAIC Chase and many other vehicle companies and battery companies.

Second, forward development, to protect the safety and interests of customers. Among the market feedback collected, only Chuangwei products have very early and accurate warning to avoid accidents, and other products do not have accurate warning cases. On the contrary, some products also occurred multiple false positives, causing customers and manufacturers to complain, resulting in great compensation.

Third, we are developing and improving the market competitiveness of our products, creating a new energy source as a new entrant in the automotive industry. We have no contacts and resources to accumulate, but we rely on the strong competitiveness of our products. The market sales and market share of the product are firmly in the forefront of the industry, and steadily increase year by year.

Fourth, the creation of new energy with its own long-term continuous scientific research investment, to avoid the imitation of simple rough plagiarism caused by bad competition, avoid falling into the quagmire of low prices and disorderly competition, guide the entire industry to pay attention to research and development, pay attention to the quality of efficient development road.

04 Establish a perfect R&D system with forward development as its orientation

Chuangwei New Energy currently has a relatively complete R&D system, which benefits from the establishment of "three major modules for product development": one is the intelligent design module, the other is the mathematical model optimization module, and the third is the simulation verification module. The intelligent design module includes "standard design process" and "standard design template"; The mathematic model optimization module includes "advanced and practical analysis and evaluation tools" and "high-performance integrated computing system"; The simulation verification module includes "simulation verification of lithium iron phosphate batteries" and "simulation verification of ternary batteries". The establishment of these three development modules is not simple. Behind it is a long-term, continuous, and large amount of technology accumulation.

After the establishment of these three module systems, the creation of a new energy source also has the capability of positive development of the product, but also has the ability to simultaneously develop the project with the vehicle.

Through the perfect research and development system, the company has not only solved the bottleneck problem of industry development, but also can develop products faster in accordance with market demand, and can also continuously upgrade products.

With the intensification of market competition in the future, the next step will be to ensure the continuous improvement of the basic performance of products, focus on the critical point of early warning, will be a step forward in the early warning phase of thermal runaway, to meet the market for thermal runaway monitoring urgent needs. To create safer and more efficient products.

The page contains the contents of the machine translation.