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Lithium

Lithium battery Era

Battery is one of the batteries. The reason why it is more forward-looking than other batteries is because of its high safety, small volume and high energy density. In the 1980s, it is also the dawn of mobile equipment research and development. The emergence of lithium battery just conforms to the development of the times& ldquo; In daily life, we constantly explore what customers and the society need. How we use science and technology to meet these needs is what researchers should do. Sometimes inspiration comes out of the way, rather than thinking about what's new, making adjustments and thinking aimlessly& rdquo; Yoshio said He said that the electrolyte (solution containing ions) in the battery used to be water. When water is applied more than 1.5V, water will be decomposed into hydrogen and oxygen. Therefore, it is impossible to obtain more than 1.5V EMF in the past. The EMF of more than 4V can be obtained by replacing water with organic solvent and carbon at the negative pole In addition, by using lithium cobalt (metal oxide containing lithium ions) as positive electrode, Asahi took the lead in putting forward the prototype of lithium battery in the world. This small battery can be used in mobile phones, laptops, digital cameras, cameras, portable music players and other major electronic devices, so its emergence is of great importance In 1991, the commercial lithium battery was officially launched around the world. After one year, with the help of the company, Yoshio Zhang served as the leader of commodity development group of ion secondary battery business promotion department, and became a & amp of the company again in August 1994; T head of battery technology development department At that time, the lithium battery developed by xuhuacheng was not good to sell. For a while, almost no one asked about it. Suddenly, the market was opened one day. That was 1995; It is also a very important year for us. Because the world has entered the mobile IT era, mobile phones and tablet computers need to use lithium batteries in large quantities. The whole world has moved to mobile Internet, so lithium battery has also shown geometric growth& rdquo; In 1995, Microsoft released a landmark Windows95 operating system with & "and; My computer &quo& ldquo; IE browser &quo; A series of inventions have been running and invincible. The world science and technology circles scream at the emergence of Windows95, which is also very impressive for jiyechang, a scientist on the other side of the ocean “ We are in the IT society. The IT revolution originated in 1995. It was that year that Microsoft released Windows95. That is, lithium batteries have led the global rush to buy& rdquo; He said. And Yoshio Chang and a group of scientists' new achievements have also been resonated with the society and experts from all over the world Because of his outstanding technology, he won numerous awards in 1999: the "of the Japanese government; "Purple Ribbon praise chapter" "Of IEEE; IEEE Medal for Environmental and Safety Technologies”( Environmental and safety technology medal), the highest award of the National Institute of Technology &; The Charles Stark Draper Prize”( Charles middlet; Stark & middle; Dreper prize) etc With the development of science and technology, xuhuacheng electronic business has also made remarkable achievements Founded in 1922, Asahi Co., Ltd. is a famous chemical enterprise in Japan. In 2016, the sales volume of main chemicals was US $8.449 billion, ranking 39 in the global chemical industry. The Japanese giant is the world leader in engineering plastics, fire and earthquake resistant building materials to medical supplies, medical devices and electronics Jino Chang is located in the research and development of lithium battery, belongs to the field of Asahi materials, and the company attaches great importance to it As for commercial products, the influence of Asahi in the global lithium battery industry is reflected in the first discourse power of diaphragm materials, and has the highest market share in the world. With the move of $2.2 billion in february2015 to acquire the world's third largest battery insulator manufacturer, polymore international, it became the leading manufacturer of dry wet diaphragm In March 2017, xuhuacheng announced that it would invest 15billion yen to use the diaphragm for lithium ion secondary battery (LIB) in Shoushan City, Shihe County, to realize the capacity of 200million square meters / year of lithium diaphragm, and it is expected to achieve 1.1 billion square meters / year capacity in 2020 Because the diaphragm has not low technical barriers in the production process, it has high requirements on equipment and design, product batch stability and workers' proficiency. Therefore, this field is monopolized by four enterprises, including Asahi, ski, Dongli BSF and American celard, with a market share of 70%. However, with the increase of demand for lithium batteries, Chin
2021-03-10
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What

What are the advantages of Gan chargers?

For traditional semiconductor materials, the high switching frequency will lead to high switching loss, and the low loss characteristics of Gan materials can reduce the heating, while increasing the switching frequency can reduce the volume of transformer and capacitor, which will help to reduce the volume and weight of charger Now the fast charging power is higher and higher, the mass production of civil Gan chargers can be said to represent a development direction of future chargers. Although the current price is relatively high, I believe that in the near future, with the technology of Gan materials becoming more and more mature and popular, the cost of Gan chargers will be lower and lower Gallium nitride (GAN) is a compound of nitrogen and gallium. It is a direct band gap semiconductor and has been widely used in light-emitting diodes since 1990. The structure of the compound is similar to wurtzite and its hardness is very high. Gallium nitride has a wide energy gap of 3.4 EV, which can be used in high-power and high-speed optoelectronic devices. For example, gallium nitride can be used in violet laser diode, and can generate violet (405nm) laser without using nonlinear diode pumped solid-state laser In 2014, Nagoya University and Nagoya University Professor Nagasaki, Nagoya University Professor Hiroshi Tano and University of California Santa Barbara Professor Nakamura Xiuer won the Nobel Prize in physics for the invention of blue LED Gan is also one of our business scope. However, due to the problem of high cost and low yield in the solution of Gan materials, Gan epitaxial films are mainly used in LED and GaN / SiC films in 5g RF devices. The use of Gan in power devices still needs time in China. At present, Gan materials can be produced by Suzhou nanotechnology in China The key chip of Xiaomi's 65W Gan charger is From Navitas nano micro Gan power chip nv6115. Its built-in driver and complex logic control circuit, 170m & omega; Resistance, 650V withstand voltage, 2MHz switching frequency, 5 * 6mm QFN package Nanomicro is the only Gan chip in the world. And nv6113, nv6117, etc Nanomicro nv6115 has been used by Anker powercore fusion PD super charge, ravpower 45W Gan PD charger, Beisi 65W Gan charger, Roxanne 66W Gan USB PD dual port fast charging charger and other products Usb-c interface VBUS switch from Huayi semiconductor, model hy15p03, PMOS, withstand voltage 30V, conduction resistance 4.8m & omega Tianyu's fast charging protocol chip has been used by Zimi 10000mah USB PD fast charging mobile power supply, Nubia Red Devils 10000mah electric competitive mobile power supply, Xiaomi 45W USB PD mobile power supply 3 high configuration version, Zimi's first MFI Certified Wireless charging mobile power supply, idmix 1a1c 18W PD fast charging charger and other fast charging products, and its performance has been widely recognized by customers Usb-a interface synchronous buck chip comes from southchip semiconductor, model sc8903. The chip is a high-efficiency synchronous buck converter with integrated four transistor H-bridge, which supports the maximum working voltage of 24 V, dynamic output voltage control, adjustable switching frequency, programmable input and output current limit, and various protection functions Usb-c interface protocol uses huinengtai semiconductor husb339. The chip is the latest USB pd3.0 fast charging protocol chip of Shenzhen huinengtai Semiconductor Technology Co., Ltd. It has passed the USB pd3.0 PPS certification of usb-if Association, TID 62. It is also the first Chinese mainland chip to be certified by USB PD3.0 PPS, which supports up to five FPDO and second APDO, supporting the optional setting and combination of FPDO files in the 5V~23V range. The maximum current level of all PDO can reach 5A. p>
2021-03-10
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Why

Why should BMS use secondary protection chip

BMS management system of lithium battery can effectively monitor, protect, balance energy and give fault alarm to lithium battery pack, so as to improve the working efficiency and service life of the whole power battery pack. Lithium battery is widely used in various precision equipment because of its high working voltage, small volume, light weight, high energy density, no memory effect, no pollution, small self discharge, long cycle life and so on. But lithium battery is still defective, its safety is poor, there are explosions and maintenance problems. Therefore, the lithium battery needs a protection board to protect the battery. Battery management system (BMS) is a system to manage the battery. It usually has the function of measuring the battery voltage to prevent or avoid abnormal conditions such as over discharge, over charging and over temperature. BMS management system itself does not have the protection function. If the BMS fails, the battery will be in a unprotected state, because the secondary protection device is needed for the BMS system.
2021-03-10
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High

High speed development of semiconductor industry promoted by gallium oxide optoelectronic materials

The 2019 National Science and technology week and Beijing Science and technology week will be held at the Chinese people's Revolutionary Military Museum. Nearly 300 scientific and technological innovation achievements, popular science exhibition items and interactive experience products in the fields of artificial intelligence, integrated circuit, aerospace, intelligent equipment, cutting-edge materials, etc. were intensively displayed. Among them, the fourth generation semiconductor gallium oxide materials and their devices have received extensive attention. As the fourth generation ultra wide band gap semiconductor materials with natural solar blind ultraviolet characteristics and extremely high breakdown field strength, they have the characteristics of solar blind, high pressure and high temperature resistance, low loss and high power, etc., and have huge application potential and broad market prospects. In this exhibition, we will present gallium oxide wafers, epitaxial wafers and solar blind UV detector arrays brought by Beijing gallium technology company. According to Zhang Xianhai, deputy general manager of marketing of Beijing gallium Technology Co., Ltd., gallium oxide wafer is the most basic material used in the back end of gallium oxide materials. It is the carrier of epitaxial materials and can be used to prepare new light-emitting diodes and laser windows. Gallium oxide epitaxial wafers are used in the preparation of photoelectric devices, sensor chips and power electronic devices. Devices are widely used in aerospace, microwave communication, rail transit, high-end equipment, smart grid, new energy vehicles, 5g communication and many other fields. In addition, the solar blind detection sensor chip will provide solid and reliable services for ultraviolet communication, corona detection, high response fire warning, ultraviolet space warning, ultraviolet guidance, atmospheric environment monitoring and other fields. Located in Shunyi Park, Zhongguancun, Beijing gazu Technology Co., Ltd. has a 2-inch single crystal growth line, a 2-inch epitaxial growth line, and a crystal processing line. At the same time, it has the ability of 4-6-inch single crystal growth, R & D, testing, and device R & D, which will help the development of China's gallium oxide semiconductor industry, We will truly promote the independent innovation of high-end technology in the optoelectronic device industry and promote the high-speed and high-quality economic development. The theme of this science and technology week is "strengthening science and technology and benefiting people through science popularization". Major achievements in science and technology innovation and achievements in benefiting people through science popularization will be displayed, so that the public can understand scientific knowledge, experience scientific fun and perceive scientific spirit.
2021-03-10
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