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Recently, another video of the combustion and explosion of new energy passenger vehicles has been quietly forwarded among friends. The safety problem of new energy vehicles has been exposed again. The safety of power battery is closely related to the safety of new energy vehicles. Upstream and downstream enterprises, including battery enterprises, are constantly working to develop solutions to ensure the safety of power battery.

On August 27, at the 2018 Shanghai International Lithium Industry Exhibition, INFICON, which is mainly engaged in leak detection instruments, and SCHOTT, a multinational group of special glass and glass ceramics, jointly released the latest solution for improving the sealing performance of new energy automotive power batteries - glass aluminum sealing technology (GTAS), which uses glass as the sealing terminal of the battery electrode, replacing traditional plastic seals to completely prevent moisture from penetrating the battery; At the same time, combined with the most advanced gas (including hydrogen, helium, etc.) detection methods of Infineon, the air tightness of power battery is accurately detected.

The safety and service life of the power battery are the two major performances that new energy automobile enterprises pay most attention to. Zhao Fanfei, the sales director of Infineon China, said: "In order to achieve a long working life, it is critical to prevent electrolyte leakage and water and moisture infiltration into the battery, because the electrolyte may react with water to generate hydrofluoric acid (with strong corrosivity), and long-term moisture infiltration may even cause complete battery damage."

Based on this, reliable leak detection must be performed on the power battery. At present, leakage detection methods of power battery include pressure method, bubble method and helium method. The leak detection level of the first two is 10-3mbar? L/s, the helium detection method reaches 10-11 mbar? l/s。 According to the data, check whether the power battery (core) shell leaks. The limit leakage rate should reach 10-5 to 10-6mbar? L/s.

This means that the helium detection method can meet the leakage detection level of the power battery. As a global leading supplier of innovative instruments, key sensor technologies and advanced process control software, INFICON is different from other helium detection equipment manufacturers in the lithium battery field in that it mainly provides core components of lithium electrical security detection equipment suppliers - leakage detection instruments. At present, Yingfukang's detector has been widely used by many well-known domestic power battery enterprises and helium inspection equipment enterprises.

INFOCON's testers cover the power battery technology route of the full series of square, cylindrical and soft bags. Take the square power cell as an example, which is sealed under atmospheric pressure or slight negative pressure (- 20mbar). After the volume separation process is completed, the degassing operation will generate slight overpressure in the cell. Random leakage may cause air and moisture to enter the cell, which may eventually lead to the discharge of electrolyte.

In this case, there are several potential leakage locations for the square power cell: the weld between the cover plate and two electrode joints and the bursting disc welded into the cover plate; Weld between cover plate and lower part of shell; Seals for electrolyte tank nozzle, etc.

INFICONLDS3000 modular leak detector launched by INFOCONLDS3000 can be used in square and cylindrical power cell detection. Customers can choose hydrogen and helium according to their needs. This new product has three features:

In the power battery sealing improvement solution jointly released by Infineon and Short Group, Short Group aims at the battery cover with weak air tightness in Figure 1.

Schott is a leading international technology group in the field of special glass and glass ceramics. Compared with the module cover plate made of up to 11 types of materials for the positive and negative poles of the traditional power cell, the glass aluminum sealing technology introduced by Short Group perfectly welded three types of materials, namely special glass, electrode (aluminum or copper) and aluminum metal ring, replacing the plastic cell cover plate at both ends of the positive and negative poles of the power cell.

In this new version of battery cover, the special glass used by Short Group will not age and has good high temperature resistance, which can effectively ensure the airtightness of the battery cover.

Ye Guohong, director of sales and business development of Short China in Asia, said: "It's like a plastic clothes hanger on the balcony, which is easy to get brittle and broken. Our solution is to fundamentally solve the problem - develop a glass metal sealing cover plate, which can effectively eliminate the weak links in the power lithium battery cover plate."

With the gradual marketization of new energy vehicles, power battery material suppliers and battery manufacturers will have more and more demand for sealing and leak detection. Based on their respective core technologies in leak detection and structural design, two German enterprises, Infocom and Short Group, will work together to meet the challenge of power battery air tightness.

Regarding the future planning of both sides, Zhao Fanfei said: "The future belongs to electric vehicles. Facing the new challenges of the times, we will continue to innovate, help the development of China's lithium battery industry, and better serve the growing new energy vehicle market."

? About INFICON

NFICON is a leading supplier of innovative instruments, key sensor technologies and advanced process control software, committed to improving the production efficiency and quality of precision vacuum processes in highly specialized market areas. These analysis, measurement and control products are crucial to the gas leakage detection in the air conditioning/refrigeration/automobile manufacturing industry. They are of great significance to original equipment manufacturers (OEMs) and end users in many fields, including the complex manufacturing fields of flat panel displays, solar cells, magneto-optical storage media, scientific and consumer optics, and semiconductor and film coatings of building glass.

NFICON's vacuum technology is also targeted at users in many other industries, including life science, scientific research, special aerospace, food packaging, heat treatment, disinfection, laser cutting and other industries. NFICON also makes full use of its vacuum technology expertise to provide unique analytical products for toxic chemical raw materials for emergency response, security and environmental monitoring markets.

? About SCHOTT

Schott is a leading international technology group in the field of special glass and glass ceramics. The company has accumulated more than 130 years of R&D, material and technical expertise, and provides a wide range of high-quality products and intelligent solutions. Short is an innovation driver in many industries, including household appliances, medicine, electronics, optics, life sciences, automobile and special industries.

In terms of improving people's quality of life, Short strives to play an important role and is committed to promoting innovation and sustainable development. Short has production bases and sales offices in 34 countries around the world. The company currently has about 15000 employees, with sales of 2.05 billion euros in fiscal 2016/2017. SCHOTTAG, the parent company headquartered in Mainz, Germany, is wholly owned by the Carl Zeiss Foundation. As a fund company, Short has special responsibilities for its employees, society and environment.

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