What is the development trend of battery technology for automobile start-stop systems?

　　In recent years, the Chinese government has increasingly tightened fuel consumption standards for automobiles. Against this background, start-stop systems that can effectively save fuel consumption have gradually become a standard feature of passenger vehicles. It is predicted that 15 million new cars in China will be equipped with start-stop systems in 2020. The next few years will usher in the golden development period of China's automobile start-stop battery market, and the market prospects are very broad.

　　According to Battery China.com, car start-stop batteries have high technical barriers, because starting and stopping requires more frequent starts and powering vehicle electrical appliances at idle speed. Start-stop batteries have higher performance than ordinary batteries. Require. At present, there are two types of start-stop batteries widely used in the market: EFB and AGM. Lead-acid batteries are still the main body of the start-stop battery market, accounting for about 90% of the market share. The market share of lithium batteries is still very small.

　　In the field of start-stop batteries, the current domestic brands mainly include Fengfan, Camel, Shuangdeng, Chaowei, Nandu, Tianfeng, etc., and the main foreign brands include Valta, German MOLL, Yuasa, Bosch, Johnson Controls, etc. During a visit and survey this year, Battery China.com learned that Fengfan Company has an annual production capacity of approximately 30 million lead-acid batteries (including 5 million AGM and EFB batteries) and is a major supplier of FAW-Volkswagen, Shanghai Volkswagen, Shanghai General Motors, Beijing Hyundai, Dongfeng Motor, etc. It is a perennial partner of most domestic large-scale automobile manufacturers and supplies AGM batteries to luxury brand cars such as Audi, Mercedes-Benz and BMW.

　　At the 2019 China International Lead-Acid Battery Summit Forum held not long ago, Pei Xinbin, chief engineer of Fengfan Research Institute, introduced the development trend of battery technology for automobile start-stop systems and shared Fengfan's research in the field of automobile start-stop system batteries over the years. Results and innovative practices.

　　Start-stop system assembly rate greatly increased

　　According to Pei Xinbin, the United States began to promote automobile start-stop systems in 2012, and the assembly rate increased significantly in 2017. He said that so far, equipping an engine start-stop system is the easiest and most effective way to reduce vehicle emissions. At present, start-stop systems have been widely promoted in developed countries. It is expected that by 2020, the installation rate of start-stop systems in Europe will reach 90%, and the installation rate of start-stop systems in the United States will reach 57%.

　　From the perspective of the Chinese market, the installation rate of start-stop systems is also increasing rapidly. The data given by Pei Xinbin is: in 2012, the standard rate of domestic automobile start-stop systems was only 10.24%, and by 2018 it had reached 56.29%. Specifically, domestic joint venture brand cars such as Mercedes-Benz, BMW, Audi, Volkswagen, and General Motors have adopted start-stop systems as standard equipment. Among them, high-end car brands basically use AGM batteries, and most Volkswagen and Japanese cars use EFB batteries. Mainstream models of domestic independent brands also use EFB batteries.

　　"With the implementation of the National VI automotive standards in 2020, start-stop technology will become one of the first choices for car companies to reduce fuel consumption, and the start-stop battery as the core of the start-stop system will receive more attention." Pei Xinbin made a judgment, and he also pointed out that the outbreak of the start-stop battery market will also be subject to more supervision.

　　Start-stop battery with better performance

　　Technically speaking, Pei Xinbin said that compared with traditional batteries, the start-stop system puts forward higher requirements for EFB battery performance: higher cycle life, 2-3 times longer than ordinary batteries; higher low-temperature and high-rate discharge performance , more than 25% higher than ordinary batteries; higher safety, you need to consider the function settings of EFB batteries and other issues; better dynamic charging capabilities, can adapt to the charging strategy of starting and stopping the car, and can quickly charge under different charging conditions Complete its own kinetic energy supplement; better consistency.

　　In order to meet the needs of reducing fuel consumption and emissions, current car charging systems adopt intelligent charging, which dynamically adjusts mainly based on battery power and temperature. Pei Xinbin explained that the start-stop system is implemented by installing an EBS device on the negative electrode of the battery. The device collects the battery voltage, current temperature and then determines the SOD value of the battery.

　　Pei Xinbin said that in order to improve the cycle life of the battery, it is necessary to choose the appropriate grid type, including expanded mesh grids, punched grids, cast grids, continuous cast grids, etc. In order to improve the low-temperature discharge capability of the battery, the discharge area of the grid must be increased. At the same time, Pei Xinbin said that Fengfan Company has also optimized the EFB battery shell material and structure to effectively ensure high safety.

　　"The Sail Company's EFB battery is also equipped with a stirring device, which we call a diversion trough. This diversion device can confuse the density of the upper and lower gallbladder fluid to achieve the purpose of easing the stratification of the electrolyte. The device has also been approved by Volkswagen Laboratories," explained Pei Xinbin.

　　During the research and development, the Fengfan Company also considered the problem of battery loss. Survey data shows that among various complaints about car batteries, battery loss accounts for a relatively large proportion. “First of all, we must pay attention to the problem of power loss of EFB batteries. Problems with power supply matching will also affect the service life of EFB batteries.” Pei Xinbin said, “When we produce EFB batteries, we have gone through strict start-stop tests. Even if we replace the original ones, After recharging the battery, the start-stop system is still normal.”

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