With the rapid development of China's new energy vehicles, the performance of the power batteries for core parts and components of new energy vehicles has also been increasingly concerned by the community. However, due to the strength of battery companies and the uneven performance of battery products, regarding the safety of batteries Some reports have caused various concerns about the application of power batteries in various sectors of society. Key words include: performance, longevity, quality, quality control, recycling, industry standards... March 19, 2016, Micro-power released A new technology that shocked the industry - does not burn the battery. How can this technology that can lead to the revolution of the power battery be solved? Can we solve the current battery issues that people are concerned about?

Wei Hong Chief Executive Officer Wu Yang

Innovation should be born out of necessity and products serve consumers

The power battery is the core of the electric vehicle core, accounting for 40% to 50% of the cost of pure electric vehicles. The quality of an electric vehicle depends to a large extent on the quality of the battery. How can battery quality measure the pros and cons? Some people say that battery life is very important. Some people say that life is very important. Some people say that performance does not decrease until it is important. Others say that safety is the most important... In my opinion, these requirements should be met simultaneously. In order to truly reflect the superiority of electric vehicles compared to fuel vehicles.

The practicality of the car lies in the convenience of driving, as long as the electric vehicle achieves fast charging, just like a traditional car can be refueled at any time; secondly, after buying a car for a few years, it does not need to replace the battery and has a one-time investment; in addition, the user does not need to worry about safety issues. In any case, No matter whether internal combustion or external open flame, the battery will not catch fire. Under such conditions, users will be willing to save money, and the national promotion policy for new energy vehicles can be implemented.

Based on this practical technology research and development idea, when Weihong began to focus on the research and development of the electric vehicle power system in 2008, it established the three elements of “10-minute fast charge,” “long life,” and “non-burning” R&D. These core R&D elements are also the foundation of the micro-macro strategy for Clean City Transportation (CCT) for urban traffic electrification. Today, through the continuous implementation of the CCT strategy, "ten minutes fast charge" and "long life" have been widely recognized by micro-macro customers, with more than 10,000 sets of applications in more than 100 cities in 6 countries. This release is also the result of a non-burning battery technology developed by Micro Macros for 8 years.

The battery can fail but the user is always safe

In the charge-discharge process of lithium-ion batteries, the active material expands and contracts continuously. This will lead to the compression of the pole piece and the diaphragm first, followed by the gradual rupture of the current collector, the diaphragm damage, and the positive electrode contacting the negative electrode, resulting in a micro-short circuit. The short circuit slowly evolved into a vicious accident.

The micro macro makes the battery separator non-shrinkable at high temperatures, ie it does not enlarge the internal short circuit. Our high security diaphragm can not shrink at 300 degrees Celsius. When the chemical reaction reaches 300 degrees Celsius, the micro-macro diaphragm can maintain its integrity and will not cause a large area of ​​internal short circuit, so that the heat in the entire battery is accumulated by chemical exothermic accumulation, and will not occur. Instantaneous thermal runaway, even if the battery fails, it also provides precious escape time for the passengers, and the electrolyte does not burn, completely killing the possibility of thermal runaway.

Therefore, the micro-macro high-security diaphragm is equipped with non-burning electrolyte. Such a combination is to pinch the two dead spots of thermal runaway. The battery can be sacrificed in the end, but the user is safe.

Realize non-flammable electrolyte, while ensuring fast charge and long life

Research shows that most lithium-ion batteries are not safe at present. Once the lithium-ion battery is in thermal runaway, the most heat is released from the electrolyte. Whether it is lithium iron phosphate, lithium manganese oxide, or ternary materials, once burned The result is the same, and the culprit is the electrolyte burning. Therefore, if the battery does not burn, first of all do the electrolyte does not burn, this is a technical problem in the industry.

After eight years of research, micro macros have finally solved the problem of the electrolyte's non-combustion and its ability to ensure fast battery life and long-life characteristics. A battery made of such an electrolyte can also achieve a fast charge of ten minutes and an extremely long cycle life of over 10,000.

In 2013, Weihong’s unburned electrolyte plant was put into use for the first phase. In June 2016, the second phase of the electrolyte workshop will be put into use. After the use, the company will produce 10 tons of electrolyte and produce more than 3,000 tons per year. In other words, Micro-Macro already has the ability to mass-produce non-burning electrolytes.

Thirty years of experience in film micro-chooses "Kevlar" film

I have done membrane research for more than 30 years, and finally chose the "Kevlar" membrane for micro macro non-burning cells. "Kevlar" is a material used to make bulletproof vests. It has a high degree of insulation. The paper it produces is made of reinforced material in the wing section of the aircraft. The separator paper it makes can be used to insulate the transformer. . The use of this material for membranes and cellulose membranes, PVDF membranes are completely different, its film formation, solubility is also very different. In addition, once Kevlar crystallizes, it will not dissolve, so even the raw materials of Kevlar are required to be synthesized by ourselves. This is a chemical project with very high technical requirements. The micro macro took eight years to complete and completely solved the resin. The dissolution, porosity, film formation, and special synthesis, as well as waste liquid recycling problems from the membrane manufacturing process.

Compared with ordinary PE separators, our membranes are resistant to high temperatures and have a higher melting point of the separators. This ensures that the batteries will not shrink even at a high temperature of 300 degrees Celsius, and that internal short-circuits can be prevented, thereby avoiding thermal runaway.

In addition, our technical department has conducted multiple acupuncture tests to detect internal short circuits, demonstrating that micro-macro high-temperature membranes are basically safe even when used with common electrolytes. We hope that the successful development of our company's high-temperature diaphragm will play a positive role in the promotion of China's electric vehicles.

STL technology from active defense to passive defense

The two active defense measures of non-combustion electrolyte and high-temperature diaphragm, together with STL's intelligent thermal fluids, are passive defense measures, and ultimately achieve non-combustion, high safety, and high performance at the battery system level.

STL is a material with excellent insulation, flame retardant and thermal conductivity. It can quickly isolate the thermal runaway point in the case of a fine internal short circuit inside the battery pack. At the same time, the use of liquid to reduce the temperature of the thermal runaway point minimizes the battery pack. Security Risk. As a passive defense system, in addition to safety, the STL can balance the internal temperature difference of the battery pack and use the external circulation to achieve better temperature control. Even if the battery pack leaks, it can be detected through liquid detection in time. It is safer. Protection.

At present, more than 10,000 vehicles equipped with micro-macro batteries in the world use such liquid sealing technology to operate in China, Europe, and the world. In all the processes, micro-macros did not occur together because of the operational safety incidents that the battery generated.

Passive defense technology is a simple technology that can reduce a lot of dangers, and the cost is low. Wu Yang hopes that the country can use this technology as an industrial standard for power batteries. Micro-Macro is willing to open this intellectual property to its peers, and all The common development of peers together to fight for China's power battery business.

After repeated tests, it has been proved that under the state of an open fire, only the micro-macro-burning battery will not burn, and other famous brand batteries will catch fire, and after the open flame is extinguished, the battery will continue to burn.

Conclusion

The non-burning battery is a technology developed by the micro-macro Chinese technicians in China. It is a new breakthrough in the lithium battery industry and will surely cause great repercussions in the industry in the world. In 2015, Panasonic Japan, South Korea’s Samsung and LG, the international predators for power batteries, set up factories in China. It can be predicted that more opponents will join the competition in China’s power battery market in the future, and MicroMacro will always be adhering to “fast charge”. The concept of "safety" and "long life" creates more non-burning power batteries and civilian battery products for users.

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