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Tian Hanrong, chairman of Time High Tech, said that the water, gas and impurities in the atmospheric environment deeply affect the performance of power batteries and pose a fatal threat to the quality of power batteries. The automatic vacuum drying is the "final barrier" to ensure the consistency of power batteries. If this process and equipment cannot keep up with it, it is hard to say that it is of high quality.

"The moisture, gas and impurities in the atmospheric environment have a profound impact on the performance of power batteries and pose a fatal threat to the quality of power batteries. Automatic vacuum drying is the 'final barrier' to ensure the consistency of power batteries." If this process and equipment cannot keep up, it is hard to say that the quality is high-end. " Tian Hanrong, Chairman of Time High Tech, disclosed at the "2016 'Fifth China Battery Market Annual Conference, the First International Summit on Power Battery Applications, and the Second China Battery Industry Intelligent Manufacturing Seminar".

If the process and equipment can't keep up, it's hard to say "high quality"

The author has learned that Time High Tech has been deeply engaged in power battery technology and equipment for many years, and has always adhered to the path of R&D and innovation. It has developed the first generation tunnel type fully automatic vacuum drying system, providing this production line in batches for leading power battery enterprises such as BYD and Guoxuan High Tech.

Tian Hanrong pointed out that in the past, enterprises only paid attention to materials, not enough attention to technology and equipment. In fact, vacuum drying is the last pass of the whole power battery. The traditional drying method has such defects as low vacuum, poor temperature uniformity, slow heating speed, and the transmission process can not isolate the atmosphere.

"It may be suggested that the drying room can avoid these problems. But in fact, the drying room is high in energy consumption, the overall humidity is high, and the entry of staff will cause secondary pollution to the battery." Tian Han dissolved the Buddhist Way. The effective countermeasure is to achieve a dry environment with high vacuum, low dew point and high uniformity, and isolate the transfer process of the upper and lower processes from the atmosphere, so as to greatly improve the consistency of the power battery.

Tian Hanrong pointed out that prior to battery manufacturing, there was no such technology and equipment, or that it had not recognized its impact. From 2002 to 2004, in the field of vacuum drying, Maxwell Technology Company in the United States made people realize the impact of moisture. The role of vacuum drying is to volatilize the water in the battery to the maximum extent, so that the water and impurities escape and the water in the battery stays as little as possible. It does not mean that the water content of this battery is 100PPM, but 500PPM. Otherwise, the "short board effect" will make the battery system difficult to manage.

If the consistency is truly achieved, the battery's endurance and safety can be guaranteed. Tian Hanrong believes that the company can only win the recognition of the industry by focusing on fine equipment. If the key processes and equipment cannot keep up, the enterprise will not have vitality. At present, the industry has begun to pay attention to the improvement of product processes and related equipment.

Where are the secrets of automatic operation under high vacuum

High vacuum is not difficult, but it is difficult to realize automation under high vacuum conditions. It is very simple under normal atmospheric environment. It is cross-border to realize fully automatic operation under vacuum. You need to understand both high vacuum and automation.

How to realize automation under vacuum? First of all, the battery must enter this space. At this time, any manual operation is impossible. A manipulator must be installed inside, but power must be transmitted to the manipulator in the vacuum environment. There must be a gap between the equipment. The vacuum environment inside is likely to be damaged. A new method must be used to achieve operation.

Tian Hanrong told the author that the new method is "magnetic fluid technology". In order to achieve high density in the field of transmission systems, magnetic fluid technology is required. This technology was found when manufacturing special products, which is a good case of military civilian integration development.

Under high vacuum conditions, temperature is the most difficult to control. The temperature has the air circulation in the natural environment. If it is heated, the temperature at this point may be 100 degrees, and the temperature at that point is 50 degrees. To eliminate the gap, it needs to be controlled. Use radiation technology to control it, add hundreds of temperature measuring points on a line, and obtain the model after thousands of times of data verification. Then, according to different needs of customers, the model is slightly modified, and different points in the vacuum chamber are at the same temperature by controlling the heating of each point. Although the cost is high, the effect is good.

Tian Hanrong said that the temperature difference of plus or minus 20 degrees under high vacuum environment is normal. If power batteries are manufactured in large quantities, it is difficult to achieve consistency in temperature. In the market, it is said that there is no technology to guarantee the positive and negative 5 degrees, let alone the positive and negative 2.5 degrees. This is a requirement put forward by Maxwell Technology. The company has spent a lot of time focusing on this work and has also made certain achievements.

Industrial development "single flower does not mean spring"

Industrial development "a single flower is not spring, and a hundred flowers bloom in the garden". Tian Hanrong believes that it is a good thing to have more enterprises participate, but we should not stay at the level of participation, blindly imitate and copy others' things, and never achieve structural upgrading.

It is reported that Time High Tech mainly focuses on power lithium battery and super capacitor. Since 2006, the company has cooperated with MAXWELL, the world leader in super capacitor industry, to develop fully automatic tunnel type vacuum drying system for eight years. The technology has occupied the leading position in the industry market.

Tian Hanrong pointed out that the company's fully automatic tunnel type vacuum drying equipment had entered the market four or five years earlier than similar equipment in Japan. And these devices are the current concept of Industry 4.0, that is, highly intelligent and networked. At present, the largest BYD 10GWH power battery factory in the world uses this fully automatic tunnel type vacuum drying equipment.

Tian Hanrong said that industrial cooperation involves upstream and downstream industries. Through strategic cooperation, everyone can maximize their interests. The cooperation between Time High Tech and BYD is not simply to purchase equipment, but to jointly carry out experiments, covering the whole process of products from the core materials, assembly, modules to the car.

In fact, the vacuum field is actually a traditional industry. The concept of low vacuum gradually rises from the hot air oven. In a few years, the process and equipment of these power batteries will be phased out, and industrial upgrading is an inevitable trend. In this regard, Tian Hanrong pointed out that he is making progress and his peers are also upgrading their industries. We should work together in this direction and be open to cooperation.

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